Wireless communication method and wireless communication device

Abstract

Provided in the embodiments of the present application are a wireless communication method and a wireless communication device. The wireless communication method is executed by a user equipment, and comprises: receiving configuration information sent by a base station, wherein the configuration information comprises information for determining uplink subband precoding; sending an uplink measurement signal to the base station; and receiving codebook-based subband precoding indication information sent by the base station, wherein the codebook-based subband precoding indication information comprises at least one piece of the following information: modulation and coding scheme (MCS) indication information, scheduling request indicator (SRI) information, precoding indication information for the number of layers of a first panel and for one subband of the first panel, precoding indication information for the remaining subbands of the first panel other than the precoding indication information for said subband, indication information for subband precoding granularity, second precoding indication information for one subband of a second panel in a multi-panel scenario, and / or precoding indication information for subbands, which are based on a determined set, among the remaining subbands of the second panel.

Description

Wireless communication methods and wireless communication devices Technical Field

[0001] This application relates to the field of mobile communication technology, specifically to a wireless communication method and a wireless communication device. Background Technology

[0002] With the continuous development of wireless communication technology, Multiple-Input Multiple-Output (MIMO) technology has become an important means to improve system capacity and spectral efficiency. However, compared with downlink (DL) MIMO, the development of uplink (UL) MIMO capabilities has lagged behind, failing to fully meet the future demands for higher uplink rates and reliability in wireless communication. In existing technologies, traditional wideband precoding methods struggle to effectively utilize channel frequency selectivity across wide bandwidths, resulting in performance limitations, and the multi-transmit antenna configuration of user equipment (UE) is not fully utilized. Therefore, it is necessary to improve uplink transmission performance, further enhance the capacity of wireless communication networks, and provide efficient and stable technical support for wireless communication networks.

[0003] In existing mobile communication systems, handover to the serving cell is required when user equipment moves between cells. Prior to 3GPP Release 18 (Rel-18), the handover process was primarily triggered by Layer 3 (L3) measurements and reconfigured and synchronized via Radio Resource Control (RRC) signaling to complete the handover between the primary and secondary cells, while simultaneously releasing and adding other cells. This process involved resetting Layer 2 (L2) and Layer 1 (L1), resulting in long handover delays and service interruptions. To optimize handover performance, Rel-18 introduced L1 / L2-triggered mobility (LTM), which offers advantages in handover delay and interruption time compared to L3-measurement-triggered handover. However, LTM still has several limitations, such as its support for handover only within the same base station and its inability to achieve mobility between different base stations (across central units, CUs), thus limiting its application scenarios. Furthermore, LTM only supports L1 measurements based on synchronization signal blocks (SSBs) and does not support event-triggered measurement reporting, resulting in lower robustness compared to L3 mobility. Therefore, future development needs to extend LTM to include L1 measurements such as channel state information reference signals (CSI-RS), and through standardized enhancements, achieve higher robustness and shorter downtime in 3GPP Rel-19. Summary of the Invention

[0004] This application provides a wireless communication method and a wireless communication device.

[0005] This application provides a wireless communication method, executed in a user equipment, comprising: receiving configuration information sent by a base station, the configuration information including information for determining uplink subband precoding; sending an uplink measurement signal to the base station; and receiving codebook-based subband precoding indication information sent by the base station, the codebook-based subband precoding indication information including at least one of the following: modulation and coding scheme (MCS) indication information, scheduling request indication (SRI) information, the number of layers of a first panel and precoding indication information for one subband of the first panel, precoding indication information for the remaining subbands in the first panel excluding the precoding indication information for the subbands, indication information for subband precoding granularity, second precoding indication information for one subband of a second panel in a multi-panel scenario, and / or precoding indication information for the remaining subbands of the second panel based on a determined set.

[0006] The above technical solutions support codebook-based subband precoding and precoding instructions for multi-panel scenarios, which can improve uplink transmission performance and system performance.

[0007] This application provides a wireless communication method, executed on a user equipment, comprising: receiving configuration information sent by a base station, the configuration information including information for determining uplink subband precoding; receiving downlink measurement signals sent by the base station, performing channel estimation based on the downlink measurement signals, and determining precoding indication information of the uplink measurement signals based on the estimated channel information; sending the uplink measurement signals to the base station; and receiving subband precoding indication information based on a non-codebook sent by the base station, the non-codebook-based subband precoding indication information including at least one of the following: modulation and coding scheme (MCS) indication information, a joint indication information of the number of layers of the first panel and scheduling request indication (SRI) information of a subband of the first panel, subband SRI information of the remaining subbands based on a determined set other than the SRI information of the subband indicated by the first indication information, indication information of subband precoding granularity, second SRI information of one subband of the second panel in a multi-panel scenario, and / or SRI information of the remaining subbands of the second panel based on a determined set.

[0008] The above technical solutions, through non-codebook-based subband precoding and precoding instructions for multi-panel scenarios, improve uplink transmission performance and system performance.

[0009] This application provides a wireless communication method, executed on a user equipment, comprising: receiving configuration information sent by a base station, the configuration information including information for determining uplink subband precoding; sending the uplink measurement signal to the base station; and receiving subband precoding indication information sent by the base station, the subband precoding indication information including at least one of the following: joint indication information of the number of spatial bases and spatial base selection, joint indication information of the number of frequency bases and frequency base selection, codebook parameter combination information, non-zero coefficient selection factor indication information, subband precoding granularity indication information, and / or, in a multi-panel scenario, part or all of the following information: joint indication information of the number of spatial bases and spatial base selection, joint indication information of the number of frequency bases and frequency base selection, codebook parameter combination information, non-zero coefficient selection factor indication information, and subband precoding granularity indication information for the second panel.

[0010] The above technical solutions improve uplink precoding flexibility and spectral efficiency by providing spatial and frequency domain basis selection and parameter indication.

[0011] This application provides a wireless communication method, executed on a user equipment, comprising: receiving configuration information sent by a base station, the configuration information including information for determining uplink subband precoding; receiving downlink measurement signals sent by the base station, performing channel estimation based on the downlink measurement signals, and determining precoding indication information of the uplink measurement signals based on the estimated channel information; sending the uplink measurement signals to the base station; and receiving subband precoding indication information sent by the base station, the subband precoding indication information including at least one of the following: modulation and coding scheme (MCS) indication information, antenna port number and selection joint indication information, frequency domain basis number, frequency domain basis selection and window length joint indication information, codebook parameter combination information, non-zero coefficient selection factor indication information, subband precoding granularity indication information, and / or, in a multi-panel scenario, partial or all of the following information: spatial basis number and spatial basis selection joint indication information, frequency domain basis number and frequency domain basis selection joint indication information, codebook parameter combination information, non-zero coefficient selection factor indication information, and subband precoding granularity indication information of the second panel.

[0012] The above technical solution improves the flexibility and efficiency of uplink transmission through subband precoding and joint parameter indication.

[0013] This application provides a wireless communication method executed in a user equipment, comprising: when an event triggering condition is met, the user equipment reports the Layer 1 measurement result triggered by the event, sends a dedicated SR message to a base station, and reports the measurement result based on the L1 measurement to the base station, including at least one of the following operations: when the dedicated scheduling request SR is multiplexed with the uplink control information UCI, the dedicated SR is retained; when the dedicated SR is multiplexed for transmission on the physical uplink shared channel PUSCH, the dedicated SR request message is carried; the measurement result is reported to the base station through the media access control unit MAC CE, and the beam information of the triggering event is preferentially mapped relative to the beam information of the non-triggered event in the normal or truncated MAC CE, and when truncation occurs, the measurement beam information of the non-triggered event is preferentially truncated.

[0014] By implementing the above technical solutions and optimizing the SR reuse and measurement result mapping mechanism, efficient measurement reporting under event triggering is achieved, thereby improving handover response speed and system stability.

[0015] This application provides a wireless communication method executed on a user equipment, comprising: receiving a channel measurement reference signal; receiving channel measurement indication information sent by the serving cell, wherein the channel measurement indication information is carried by downlink control information (DCI) or media access control unit (MAC CE) and includes at least one of the following information: bitmap, cell index, resource index, number of combinations, transmission configuration indication (TCI) status, and channel state information (CSI) measurement indication information, instructing the user equipment to perform CSI measurement on the reference signal of the candidate cell.

[0016] The above technical solution uses a flexible measurement indication mechanism to accurately guide user equipment to perform CSI measurements, reducing terminal burden and improving cell handover efficiency and system resource utilization.

[0017] This application provides a wireless communication method executed at a base station, comprising: sending configuration information to a user equipment, the configuration information including information for determining uplink subband precoding; receiving an uplink measurement signal sent by the user equipment; and sending codebook-based subband precoding indication information to the user equipment, the codebook-based subband precoding indication information including at least one of the following: modulation and coding scheme (MCS) indication information, scheduling request indication (SRI) information, the number of layers of a first panel and precoding indication information for one subband of the first panel, precoding indication information for the remaining subbands in the first panel excluding the precoding indication information for the subbands mentioned above, indication information for subband precoding granularity, second precoding indication information for one subband of a second panel in a multi-panel scenario, and / or precoding indication information for the remaining subbands of the second panel based on a determined set.

[0018] The above technical solutions support codebook-based subband precoding and precoding instructions for multi-panel scenarios, which can improve uplink transmission performance and system performance.

[0019] This application provides a wireless communication method, executed at a base station, comprising: sending configuration information to a user equipment, the configuration information including information for determining uplink subband precoding; sending a downlink measurement signal to the user equipment, performing channel estimation based on the downlink measurement signal, and determining precoding indication information of the uplink measurement signal based on the estimated channel information; receiving the uplink measurement signal sent by the user equipment; and sending non-codebook-based subband precoding indication information to the user equipment, the non-codebook-based subband precoding indication information including at least one of the following: modulation and coding scheme (MCS) indication information, a joint indication information of the number of layers of the first panel and scheduling request indication (SRI) information of a subband of the first panel, subband SRI information of the remaining subbands based on a determined set other than the SRI information of the subband indicated by the first indication information, indication information of subband precoding granularity, second SRI information of one subband of the second panel in a multi-panel scenario, and / or SRI information of the remaining subbands of the second panel based on a determined set.

[0020] The above technical solutions, through non-codebook-based subband precoding and precoding instructions for multi-panel scenarios, improve uplink transmission performance and system performance.

[0021] This application provides a wireless communication method executed at a base station, comprising: sending configuration information to a user equipment, the configuration information including information for determining uplink subband precoding; receiving the uplink measurement signal sent by the user equipment; and sending subband precoding indication information to the user equipment, the subband precoding indication information including at least one of the following: joint indication information of the number of spatial bases and spatial base selection, joint indication information of the number of frequency bases and frequency base selection, codebook parameter combination information, non-zero coefficient selection factor indication information, subband precoding granularity indication information, and / or, in a multi-panel scenario, part or all of the following information: joint indication information of the number of spatial bases and spatial base selection, joint indication information of the number of frequency bases and frequency base selection, codebook parameter combination information, non-zero coefficient selection factor indication information, and subband precoding granularity indication information for the second panel.

[0022] The above technical solutions improve uplink precoding flexibility and spectral efficiency by providing spatial and frequency domain basis selection and parameter indication.

[0023] This application provides a wireless communication method, executed at a base station, comprising: sending configuration information to a user equipment, the configuration information including information for determining uplink subband precoding; sending a downlink measurement signal to the user equipment, performing channel estimation based on the downlink measurement signal, and determining precoding indication information of the uplink measurement signal based on the estimated channel information; receiving the uplink measurement signal sent by the user equipment; and sending subband precoding indication information to the user equipment, the subband precoding indication information including at least one of the following: modulation and coding scheme (MCS) indication information, antenna port number and selection joint indication information, frequency domain basis number, frequency domain basis selection and window length joint indication information, codebook parameter combination information, non-zero coefficient selection factor indication information, subband precoding granularity indication information, and / or, in a multi-panel scenario, partial or all of the following information: spatial basis number and spatial basis selection joint indication information, frequency domain basis number and frequency domain basis selection joint indication information, codebook parameter combination information, non-zero coefficient selection factor indication information, and subband precoding granularity indication information of the second panel.

[0024] The above technical solution improves the flexibility and efficiency of uplink transmission through subband precoding and joint parameter indication.

[0025] This application provides a wireless communication method executed at a base station, comprising: when an event triggering condition is met, the base station receives a dedicated SR message sent by a user equipment for an event-triggered Layer 1 measurement result report, and receives the measurement results reported by the user equipment based on L1 measurement, including at least one of the following operations: when the dedicated scheduling request SR is multiplexed with uplink control information UCI, the dedicated SR is retained; when the dedicated SR is multiplexed for transmission on the physical uplink shared channel PUSCH, a dedicated SR request message is carried; the measurement results reported by the user equipment are received through a media access control unit (MAC CE); the beam information triggering the event is preferentially mapped relative to the beam information of non-triggered events in a normal or truncated MAC CE; when truncation occurs, the measurement beam information of non-triggered events is preferentially truncated.

[0026] By implementing the above technical solutions and optimizing the SR reuse and measurement result mapping mechanism, efficient measurement reporting under event triggering is achieved, thereby improving handover response speed and system stability.

[0027] This application provides a wireless communication method executed at a base station, comprising: sending a channel measurement reference signal to a user equipment; and sending channel measurement indication information to the user equipment via a serving cell. The channel measurement indication information is carried by downlink control information (DCI) or media access control unit (MAC CE) and includes at least one of the following: a bitmap, a cell index, a resource index, a combination number, a transmission configuration indication (TCI) status, and channel state information (CSI) measurement indication information, instructing the user equipment to perform CSI measurements on the reference signal of a candidate cell.

[0028] The above technical solution uses a flexible measurement indication mechanism to accurately guide user equipment to perform CSI measurements, reducing terminal burden and improving cell handover efficiency and system resource utilization.

[0029] This application provides a wireless communication device, including a processor and a memory. The memory stores a computer program, and the processor calls and runs the computer program stored in the memory to perform the method described above.

[0030] The user equipment provided in this application includes a processor and a memory. The memory is used to store computer programs, and the processor is used to call and run the computer programs stored in the memory to perform the methods described above.

[0031] The base station provided in this application includes a processor and a memory. The memory stores a computer program, and the processor calls and runs the computer program stored in the memory to perform the methods described above.

[0032] The network element provided in this application embodiment includes a processor and a memory. The memory is used to store computer programs, and the processor is used to call and run the computer programs stored in the memory to perform the methods described above.

[0033] The chip provided in this application embodiment is used to implement the above-described method.

[0034] Specifically, the chip includes a processor for retrieving and running a computer program from memory, causing a device equipped with the chip to perform the methods described above.

[0035] The computer-readable storage medium provided in this application embodiment is used to store a computer program that causes a computer to perform the above-described method.

[0036] The computer program product provided in this application includes computer program instructions that cause a computer to perform the above-described method.

[0037] The computer program provided in this application embodiment, when run on a computer, causes the computer to perform the above-described method. Attached Figure Description

[0038] The accompanying drawings, which are included to provide a further understanding of this application and form part of this application, illustrate exemplary embodiments and are used to explain this application, but do not constitute an undue limitation of this application. In the drawings:

[0039] Figure 1 is a schematic diagram of a wireless communication system architecture provided in an embodiment of this application;

[0040] Figure 2A is a flowchart illustrating the wireless communication method provided in an embodiment of this application;

[0041] Figure 2B is a flowchart illustrating the wireless communication method provided in an embodiment of this application;

[0042] Figure 2C is a flowchart illustrating the wireless communication method provided in an embodiment of this application;

[0043] Figure 3A is a flowchart illustrating the wireless communication method provided in an embodiment of this application;

[0044] Figure 3B is a flowchart illustrating the wireless communication method provided in an embodiment of this application;

[0045] Figure 3C is a flowchart illustrating the wireless communication method provided in an embodiment of this application;

[0046] Figure 4A is a flowchart illustrating the wireless communication method provided in an embodiment of this application;

[0047] Figure 4B is a flowchart illustrating the wireless communication method provided in an embodiment of this application;

[0048] Figure 4C is a flowchart illustrating the wireless communication method provided in an embodiment of this application;

[0049] Figure 5A is a flowchart illustrating the wireless communication method provided in an embodiment of this application;

[0050] Figure 5B is a flowchart illustrating the wireless communication method provided in an embodiment of this application;

[0051] Figure 5C is a flowchart illustrating the wireless communication method provided in an embodiment of this application;

[0052] Figure 6A is a flowchart illustrating the wireless communication method provided in an embodiment of this application;

[0053] Figure 6B is a flowchart illustrating the wireless communication method provided in an embodiment of this application;

[0054] Figure 6C is a flowchart illustrating the wireless communication method provided in an embodiment of this application;

[0055] Figure 7A is a flowchart illustrating the wireless communication method provided in an embodiment of this application;

[0056] Figure 7B is a flowchart illustrating the wireless communication method provided in an embodiment of this application;

[0057] Figure 7C is a flowchart illustrating the wireless communication method provided in an embodiment of this application;

[0058] Figure 8 is a schematic structural diagram of a wireless communication device provided in an embodiment of this application;

[0059] Figure 9 is a schematic structural diagram of a chip according to an embodiment of this application;

[0060] Figure 10 is a schematic block diagram of a wireless communication system provided in an embodiment of this application. Detailed Implementation

[0061] The technical solutions of the embodiments of this application will now be described with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of this application, and not all of them. All other embodiments obtained by those skilled in the art based on the embodiments of this application without creative effort are within the scope of protection of this application.

[0062] Compared to DL (Multiple-Input Multiple-Output), UL (Uniform-Input Multiple-Output) capabilities have evolved relatively slowly. In the future, to accommodate more powerful terminal devices (such as CPEs and vehicle-type user equipment) and the increased traffic demands supporting symmetrical uplink and downlink data rates, further enhancements to UL performance are needed. For example, increasing the number of uplink transmit antennas and fully utilizing the frequency selectivity of the uplink channel can significantly improve UL performance. Furthermore, since user equipment typically has more transmit antennas than actual transmit links, a transmit antenna selection mechanism can be introduced to dynamically select a subset of antennas with better channel quality, thereby achieving more robust and higher data rate uplink transmission.

[0063] Frequency-selective precoding has been widely validated in deep learning (DL), demonstrating a significant performance improvement over wideband precoding. However, for low-frequency (UL), due to the wider bandwidth (e.g., up to 100MHz in FR1 and 400MHz in FR2), a single wideband precoder cannot fully utilize the channel's frequency selectivity. To better leverage the gain effect of adaptive link adjustment, future development is expected to support frequency-selective precoding.

[0064] Relevant scenarios include near-static applications (such as home entertainment, indoor offices, and shopping malls), where the channel can remain stable for relatively long periods, thus facilitating the optimization and adaptation of the closed-loop link. In lightly loaded cells with fewer users (such as home entertainment), each user may occupy the entire system bandwidth; frequency-selective precoding can support higher modulation and coding orders, thereby achieving higher spectral efficiency. In densely loaded cells (such as indoor offices), frequency-selective precoding can achieve more precise frequency division multiplexing, improving spectrum utilization efficiency. However, traditional UL precoding only supports wideband codebooks and not subband codebooks.

[0065] Uplink Codebook Transmission Scheme: For a codebook-based uplink transmission scheme, the user equipment (UE) first sends a sounding reference signal (SRS) to the base station to obtain uplink channel state information. The base station performs uplink channel detection based on the SRS sent by the UE, determining the SRS resources, transmission layer number, and precoding matrix corresponding to the uplink transmission. It further combines the precoding matrix and channel information to determine the modulation and coding scheme (MCS) level for the uplink transmission. Subsequently, the base station notifies the UE of the resource allocation information of the physical uplink control channel (PUSCH), along with the corresponding MCS, transmission precoding matrix indicator (TPMI), transmission layer number, and corresponding SRI and SRS resource indicators. The UE modulates and codes the data according to the MCS sent by the base station, and uses the SRI, TPMI, and transmission layer number to determine the precoding matrix and transmission layer number used for data transmission. Finally, the precoded data is sent to the base station.

[0066] Uplink Non-Codebook Transmission Scheme: For the non-codebook uplink transmission scheme, the user equipment (UE) first needs to measure the downlink reference signal to obtain candidate uplink precoding matrices. Subsequently, the UE precodes the transmitted SRS based on the candidate precoding matrices. The base station performs uplink channel detection based on the SRS transmitted by the UE, determines the SRS resources and MCS level corresponding to the uplink transmission, and notifies the UE of the relevant information. Simultaneously, the base station indicates the SRS resources corresponding to the uplink transmission through SRI and SRS resources. The UE modulates and codes the data according to the MCS transmitted by the base station and uses SRI to determine the data precoding and transmission layer number. Finally, the UE precodes the data and transmits it to the base station. Unless the higher-layer parameter ul-FullPowerTransmission is set to 'fullpowerMode2', when configuring multiple SRS resources in 'codebook' mode through SRS-ResourceSet, the UE needs to ensure that the configuration value of the higher-layer parameter nrofSRS-Ports of all SRS-Resources in the SRS-ResourceSet remains consistent.

[0067] Uplink 8TX Broadband Codebook Solution: For 8Tx uplink transmission, user equipment supports {N g =1, N1=4, N2=1}, {N g The full-phase interference coding of N = 1, N1 = 2, N2 = 2, and N g =2 and N g =4 partial phase interference coding, and N g =8-bit non-full-phase interference coding; and for codebook-based uplink precoding, joint indication of layer number and codebook is supported, that is, the base station jointly indicates the selected codebook information and layer number in the downlink control information (DCI) through the precoding information and layer number fields; the specific bit overhead of the indication depends on the supported codebook type CodebookType, the supported layer number, and the configuration of parameters such as the corresponding uplink antenna distribution and full power transmission mode. For example, according to Table 7.3.1.1.2-5B in 3GPP 38.212, for 8 antenna ports, if CodebookType = Codebook1, the transform precoder is disabled, the maximum rank is 8, and 7 bits are used according to ULcodebookFC-N1N2.

[0068] For non-codebook uplink 8Tx transmissions, the SRS resource indicator and the corresponding layer number are indicated through the SRS resource indicator field in the DCI, requiring a bit overhead of [missing information]. Where L max N represents the maximum number of supported layers. SRS It is the number of SRS resources configured in the SRS resource set, as indicated by the SRS resource set indicator field (if present).

[0069] Uplink Precoding Indication Scheme Based on Two-Level DCI (Rel-16 eType II): This proposes an uplink transmission scheme that implements subband precoding through a linear combination of frequency domain (FD) bases. Specifically, for each antenna port, one or more FD bases can be applied across all subbands, with a specific correlation coefficient assigned to each base. The gNB (e.g., based on SRS signal transmission) measures the uplink channel, determines the optimal combination containing one or more FD bases and their correlation coefficients, and configures these FD bases and coefficients to the UE. This subband-based precoding scheme achieves significant performance gains without imposing excessive burden on the UE implementation.

[0070] In some cases, the gNB can configure FD bases and coefficients for the UE via two-stage DCI signaling (involving first and second DCI transmissions). In this case, the first DCI provides sufficient information for the complete precoder. For example, the first DCI can indicate at least one (or more, or even all) FD bases and their corresponding coefficients. In one approach, coefficients per layer, per FD base, and per port can be indicated by quantizing or jointly quantizing individual coefficients across these ports, FD bases, and layers. In another approach, a reference amplitude can be indicated for each layer. The second DCI then provides the remaining information for subband precoding. For example, when the first DCI does not cover all FD bases, the second DCI can indicate the remaining FD bases. Furthermore, the second DCI can also indicate the corresponding coefficients (e.g., remaining coefficients or differential power and phase of each coefficient). This can be used to optimize control information transmission, reduce the size of the DCI, and provide flexible resource management. Specifically, the DCI is used to schedule UE resources, such as frequency domain resources, time domain resources, modulation and coding schemes, etc. The corresponding coefficients here can refer to frequency domain or power-related parameters. These parameters can be related to channel estimation, power allocation, or phase adjustment. The corresponding coefficients can be used to adjust the UE's transmission characteristics on the remaining FD bases, such as the power distribution of different subcarriers or frequency bands. The remaining coefficients can indicate how to adjust the transmission power, phase, or other parameters of frequency domain resources not covered by the first DCI. The differential power of each coefficient can refer to the power allocated relative to the first DCI, and the second DCI can indicate the power adjustment of the remaining FD bases. For example, the first DCI can indicate the power level of some FD bases, while the second DCI can simply transmit the relative power adjustment value, rather than the absolute power. This reduces the size of control information and improves signaling efficiency. The phase of each coefficient can indicate that the second DCI does not directly indicate a new phase value, but instead provides a phase adjustment value (e.g., phase difference) relative to the first DCI. This approach reduces the required control information while ensuring continuous beam adjustment.

[0071] A mechanism is proposed to enhance system robustness, enabling the back-off operation of the two-stage DCI method even when the UE can only decode one of the two DCIs. In other words, by providing information for at least one basic precoder, the UE can perform UL precoding even if it misses one of the DCIs. Specifically, the UE obtains set information of one or more FD bases and linear combination coefficients by receiving at least one of the first or second DCIs from the network entity. Then, the UE determines the subband precoding scheme based on the received first DCI, second DCI, or a combination of both. Finally, the UE transmits the Physical Uplink Shared Channel (PUSCH) using this subband precoding scheme.

[0072] Rel 16 eTypeII codebook: The existing Rel 16 eTypeII codebook uses a three-level codebook architecture. Where W1∈C P×2L Describes the spatial basis matrix. These are the projection coefficients obtained by projecting the precoding matrix onto the basis matrices in the spatial and frequency domains. It is the frequency domain basis matrix, P is the number of antenna ports, L represents the number of spatial basis vectors selected for a single polarization direction, and M is the frequency domain basis matrix. v N represents the number of frequency domain basis vectors corresponding to the v-th layer, and N3 represents the number of CQI subbands. In the above codebook architecture, the dimensional information of different matrices is partly or entirely indicated by the base station to the user equipment, for example, L, M... v The base station indicates the number of user equipment spatial frequency domain bases and the control factor for the number of non-zero coefficients reported by the user equipment in the form of codebook parameter combinations.

[0073] in, R represents the number of PMI subbands included in the CQI subband; β is used to control the number of maximum non-zero coefficients reported. For example, the number of maximum non-zero coefficients reported by the user equipment at layer 1 can be expressed as... Furthermore, the positions of the non-zero coefficients reported in W2 are indicated by a bitmap, the length of which is 2LM. v Furthermore, for the Rel-16 eType II codebook, the spatial frequency domain basis matrix is ​​selected based on a set of orthogonal DFT vectors. For example, the spatial basis matrix W1 is a block diagonal matrix. The latitude of w is w∈C P / 2×L The L column vectors of matrix w are selected from the set of orthogonal DFT vectors with dimension P / 2; and W f M of the matrix v The column vectors are selected from the set of orthogonal DFT vectors with dimension N3.

[0074] As mentioned earlier, to ensure that the UE can complete UL precoding even if it misses one of the DCIs, each DCI will indicate enough information to support the basic UL precoder. This means that in a two-stage PUSCH scheduling scenario, each DCI will contain key information for the basic UL precoder.

[0075] Rel 17 FeTypeII codebook: The existing Rel 17 FeTypeII codebook uses a three-level codebook architecture. in Represents the spatial basis matrix. These are the projection coefficients obtained by projecting the precoding matrix onto the basis matrices in the spatial and frequency domains. Here, P is the frequency domain basis matrix, P is the number of antenna ports, K1 = 2L, where L represents the number of antenna ports selected for a single polarization direction, M represents the number of selected frequency domain basis vectors, and N3 represents the number of PMI subbands. In the above codebook architecture, some or all of the dimensional information of different matrices is directly or indirectly indicated to the user equipment by the base station, such as M, K1, etc. The base station indicates the number of user equipment ports selected, the number of frequency domain basis vectors, and the control factor β for the number of non-zero coefficients reported by the user equipment through combinations of codebook parameters. Here, M = 1 or 2, and β is used to control the number of reported maximum non-zero coefficients. For example, the number of maximum non-zero coefficients reported by the user equipment at the first layer can be expressed as... Furthermore, the positions of the reported non-zero coefficients in W2 are indicated by a bitmap, with a bitmap length of 2LM. Additionally, for the Rel-17 FeTypeII codebook, the spatial-frequency domain basis matrix is ​​selected based on a set of orthogonal DFT vectors. For example, the spatial-frequency basis matrix W1 is a block diagonal matrix. The latitude of w is w∈C P / 2×L The L column vectors of matrix w are selected from the set of orthogonal DFT vectors with dimension P / 2; and W f M of the matrix v The column vectors are selected from the set of orthogonal DFT vectors with dimension N3.

[0076] In existing mobile communication systems, when a user equipment moves from the coverage area of ​​one cell to another, handover of the serving cell becomes an inevitable process. Traditionally, prior to Rel-18, handover of the serving cell was primarily triggered by L3 layer measurements and reconfigured and synchronized via Radio Resource Control (RRC) signaling to complete the handover of the primary and secondary cells, while releasing and adding additional cells where applicable. This process involves a complete reset of both the L2 (Data Link Layer) and L1 (Physical Layer), resulting in longer handover delays, greater system overhead, and longer service interruption times.

[0077] To address the aforementioned issues, Rel-18 introduced LTM technology. Compared to traditional L3 measurement-triggered mobility, LTM offers significant improvements in handover latency and downtime. However, LTM also has some limitations. First, LTM operation only supports inter-cell mobility within the same base station or CU, which may limit its application scenarios in practical network deployments. By extending LTM operation to cell handovers across different base stations (cross-CUs), the network can reap the benefits of LTM in more handover scenarios.

[0078] Secondly, L3 mobility is triggered by measurement reports, enabling UEs to report measurement results based on specific events, thereby reducing the signaling overhead of periodic reporting. However, LTM mobility is based on L1 measurements and does not support this event-triggered mechanism. Currently, L1 measurements in LTM procedures are limited to synchronization signal block measurements, failing to cover a wider range of signal types. By extending L1 measurements to channel state information reference signals, this limitation can be overcome, and it is expected to immediately improve the throughput of the target cell after cell handover.

[0079] Furthermore, L3 mobility has been continuously optimized across multiple versions, with the development of conditional handover and other conditional mobility procedures (such as CPAC and SCPAC). These procedures can operate without prior signaling exchange with the source cell, significantly improving system robustness. Although LTM technology in Rel-18 performs well in reducing downtime, its robustness has not yet reached the level of L3-based conditional mobility procedures. Therefore, in Rel-19, it is necessary to enhance and standardize LTM to achieve a dual optimization of high robustness and short downtime.

[0080] In existing technologies, CSI-IM measurement resource configuration is mainly used for inter-cell interference measurement. In current cells, CSI-IM resources are typically configured as zero-power CSI-RS (ZP CSI-RS), meaning no signal is transmitted, while normal signal transmission (e.g., data transmission) occurs on the same resources in neighboring cells. Thus, by measuring the received power of the CSI-IM resources using user equipment, interference from other cells can be estimated, and the signal measured on the CSI-IM resources is usually assumed to be the PDSCH of neighboring cells.

[0081] Furthermore, CSI-IM resources support three time-domain behaviors: periodic, semi-persistent, and aperiodic. CSI-IM resources have two possible resource element patterns: a 22-pattern spanning two consecutive subcarriers and two consecutive symbols; and a 41-pattern spanning four consecutive subcarriers and one symbol. These resource element patterns are configured by the RRC parameter csi-IM-ResourceElementPattern.

[0082] In existing technologies, when CSI-RS (Channel State Information Reference Signal) is used for L1-RSRP (Reference Signal Received Power) and L1-SINR (Signal-to-Noise Ratio) calculations, if the User Equipment (UE) configures an NZP-CSI-RS-ResourceSet and the higher-layer parameter repetition is set to "on", the UE can assume that the CSI-RS resources in the NZP-CSI-RS-ResourceSet (as described in Section 5.2.2.3.1 of Standard 38.214) are transmitted using the same downlink spatial domain transmission filter, and that these resources are transmitted in different orthogonal frequency division multiplexing (OFDM) symbols. If repetition is set to "off", the UE should not assume that the CSI-RS resources in the NZP-CSI-RS-ResourceSet are transmitted using the same downlink spatial domain transmission filter.

[0083] When a UE configures CSI-ReportConfig and reportsQuantity is set to "cri-RSRP", "cri-SINR", or "none", if the CSI-ResourceConfig used for channel measurement (i.e., the higher-layer parameter resourcesForChannelMeasurement) contains an NZP-CSI-RS-ResourceSet with the higher-layer parameter repetition configured but no trs-Info configured, the UE can only configure the same number (1 or 2) of ports, and these ports are configured by the higher-layer parameter nrofPorts for all CSI-RS resources in that set. Furthermore, if the UE configures CSI-RS resources in the same OFDM symbol as the SS / PBCH block, the UE can assume that the CSI-RS and the SS / PBCH block are quasi-co-located when "typeD" applies. The UE should not expect to configure CSI-RS in a physical resource block (PRB) overlapping with the SS / PBCH block, and the UE should expect the CSI-RS and the SS / PBCH block to use the same subcarrier spacing.

[0084] In existing technologies, the processing delay of the channel state information reference signal is determined by two parameters, Z and Z'. Z mainly describes the resolution time of the DCI (downlink control information), while Z' describes the time required for channel state measurement, i.e., the time required to complete the CSI (channel state information) measurement. Since A-CSI (Active CSI) is activated through the DCI, the measurement requirements for CSI, such as whether CSI measurement is necessary, can only be determined after resolving the DCI. Therefore, the resolution time of the DCI is also a factor that needs to be considered.

[0085] The specific values ​​of Z and Z' are detailed in the protocol. For example, Protocol 38.214 specifies the value requirements for Z and Z' under different requirements. The computation time required also varies depending on the codebook type or measurement type. For instance, for Rel-15 Type-I codebook, Rel-16 Type-II codebook, and Rel-17 Type-II codebook, the processing time of CSI mainly depends on the value requirements of Z and Z' under different requirements.

[0086] In existing technologies, the signaling process of LTM mainly involves signaling interaction between user equipment, source base station, and target base station. The main purpose of LTM is to accelerate the handover process and reduce handover latency and downtime by triggering it through the physical layer (L1) or data link layer (L2).

[0087] During LTM operation, when the UE detects a degraded signal quality or receives a stronger signal from the target cell, the L1 or L2 layer triggers a mobility procedure, sending a handover request to the source base station. Upon receiving the request, the source base station determines whether to proceed with the handover based on the measurement results and information from the target base station. Subsequently, the source base station communicates with the target base station via the Xn or NG interface to complete resource pre-allocation and handover preparation for the target cell.

[0088] Compared to traditional L3 measurement-triggered mobility, LTM reduces signaling complexity by not relying on L3 measurement reports and RRC signaling exchange. Its advantages include significantly reduced handover latency and reduced system overhead caused by L2 and L3 layers. However, current LTM operations have certain limitations, such as supporting only cell handovers within the same base station or CU, making it unsuitable for cross-base station handover scenarios. Furthermore, LTM signaling procedures need optimization for different network configurations to improve its applicability in various deployment scenarios.

[0089] The LTM process mainly involves signaling interaction between user equipment and base station, and the specific steps are as follows:

[0090] Step 1: Measurement Reporting Phase: The user equipment sends a MeasurementReport message to the base station. The base station decides whether to configure LTM based on the report and starts the preparation work for LTM.

[0091] Step 2: RRC Reconfiguration Phase: The base station sends an RRCReconfiguration message to the user equipment, which contains the LTM candidate configuration. The UE receives and stores the configuration.

[0092] Step 3: Configuration Confirmation Phase: The user equipment confirms receipt of the LTM candidate configuration and sends an RRCReconfigurationComplete message to the base station.

[0093] Step 4: Synchronization Phase

[0094] Before receiving a cell handover command, the user equipment performs downlink synchronization with the LTM candidate cell and activates or deactivates the transmission configuration indicator (TCI) status of the LTM candidate cell based on the triggering of the base station.

[0095] If UE-based timing advance (TA) measurement is configured, the user equipment (UE) can obtain the TA value by performing uplink synchronization with LTM candidate cells through TA measurement or by sending preambles. The UE relies on the network implementation to ensure the validity of the TA and does not maintain the TA timer for the candidate cells.

[0096] Step 5: L1 Measurement Phase: The user equipment performs L1 layer measurements on the configured LTM candidate cells and sends an L1 measurement report to the gNB. This measurement is performed based on the RRC reconfiguration.

[0097] Step 6: Cell Handover Command Phase: The base station decides to perform a handover to the target cell and triggers an LTM cell handover command via a MAC CE message. This message includes the target configuration ID, TCI status, downlink / uplink beam indication, and a timing advance command for the target cell (if applicable). The UE hands over to the target cell according to the command and applies the candidate configuration indicated by the target configuration ID.

[0098] Step 7: Random Access Procedure: If the user equipment does not have a valid TA value for the target cell, the UE shall perform a random access procedure to the target cell in accordance with TS 38.321.

[0099] Step 8: Handover Completion Phase: The user equipment sends an RRCReconfigurationComplete message to the target cell to complete the LTM cell handover. If the user equipment performed the random access procedure, the LTM handover is considered successful when the RA procedure is successfully completed; if the RA procedure was not performed, the handover is considered successful when the user equipment's first uplink data is successfully received.

[0100] Steps 4 through 8 can be executed multiple times based on the LTM candidate configuration provided in step 2 for subsequent cell handover. The entire air interface procedure applies to LTM operations within and between gNB-DUs, and the overall LTM procedure is described in detail in TS 38.401.

[0101] In existing technologies, Rel-19 proposes event-driven beam measurement, which mainly includes the following event types:

[0102] Event 1: The quality of the current beam is below the predetermined threshold.

[0103] Event 2: At least one new beam (such as L1-RSRP) has a better quality than the current beam and reaches a threshold value.

[0104] Event 7: At least one new beam (e.g., L1-RSRP) has a quality better than the Mth best beam in the activated TCI state and reaches the threshold.

[0105] Based on these event types, the terminal reports the corresponding beam measurement information via uplink control information (UCI). Uplink resource allocation can be obtained through two methods: Mode A and Mode B.

[0106] Mode A: Supports the use of at least 1 bit of indication information in the first PUCCH channel to request resources for the second uplink channel to transmit beam reports.

[0107] Mode B: Supports the use of at least 1 bit of indication information in the first PUCCH channel to notify the second uplink channel for transmitting beam reports.

[0108] For event 2, the measurements reported by the terminal include: CRI or SSBRI#1, CRI or SSBRI#2, ..., CRI or SSBRI#N, L1-RSRP#1, differential L1-RSRP#2, ..., differential L1-RSRP#N.

[0109] If RRC has enabled the reporting mode for the current beam, it will also report the differential L1-RSRP for the current beam. Details are as follows:

[0110] The differential L1-RSRP#2~#N / current beam is determined based on the difference between the measured L1-RSRP (corresponding to CRI / SSBRI#2~#N / current beam) and the measured L1-RSRP (corresponding to CRI / SSBRI#1).

[0111] L1-RSRP#1 is the maximum RSRP value measured in the report, and is an absolute L1-RSRP.

[0112] Based on the above technologies, Rel-19's event-driven beam measurement can effectively improve the measurement and management accuracy of beam quality, especially in multi-beam selection and reporting. It can adapt to more complex wireless environments and ensure system stability and performance.

[0113] The technical solutions of this application can be applied to various wireless communication systems, such as: Long Term Evolution (LTE) systems, LTE Frequency Division Duplex (FDD) systems, LTE Time Division Duplex (TDD) systems, 5G communication systems, or future wireless communication systems.

[0114] For example, the wireless communication system 100 used in this application embodiment is shown in FIG1. ​​The wireless communication system 100 may include a network-side device 110, which may be a device communicating with a user equipment (UE) 120. The network-side device 110 can provide communication coverage for a specific geographical area and can communicate with user equipment located within that coverage area. Optionally, the network-side device 110 may be a base station or a Location Management Function (LMF) for providing location services. Optionally, the base station may be an evolved Node B (eNB or eNodeB) in an LTE system, or the base station may be a mobile switching center, relay station, access point, vehicle-mounted equipment, wearable device, hub, switch, bridge, router, network equipment in a 5G network, or a base station in a future communication system, etc.

[0115] The wireless communication system 100 also includes at least one user equipment 120 located within the coverage area of ​​the network-side device 110. As used herein, "user equipment" includes, but is not limited to, devices configured to receive / transmit communication signals via wired connections, such as via Public Switched Telephone Networks (PSTN), Digital Subscriber Line (DSL), digital cable, direct cable connection; and / or another data connection / network; and / or via a wireless interface, such as for cellular networks, Wireless Local Area Networks (WLAN), digital television networks such as DVB-H networks, satellite networks, AM-FM broadcast transmitters; and / or other user equipment. User equipment configured to communicate via a wireless interface may be referred to as "wireless user equipment 120," "wireless user equipment 120," or "mobile user equipment 120." Examples of mobile user equipment 120 include, but are not limited to, satellite or cellular phones; personal communications system (PCS) user equipment 120 that can combine cellular radiotelephony with data processing, fax, and data communication capabilities; PDAs that may include radiotelephones, pagers, Internet / intranet access, web browsers, notebooks, calendars, and / or Global Positioning System (GPS) receivers; and conventional laptop and / or handheld receivers or other electronic devices that include radiotelephone transceivers. User equipment can refer to access user equipment 120, user units, user stations, mobile stations, mobile stations, remote stations, remote user equipment, mobile devices, wireless communication equipment, or user agents. The access user equipment 120 can be a cellular phone, cordless phone, Session Initiation Protocol (SIP) phone, Wireless Local Loop (WLL) station, Personal Digital Assistant (PDA), handheld device with wireless communication capabilities, computing device or other processing device connected to a wireless modem, vehicle-mounted device, wearable device, user equipment in a 5G network, or user equipment in a future PLMN, etc.

[0116] Some embodiments of this application design MIMO enhancement techniques, uplink antenna selection, and / or high-resolution codebook schemes for UL MIMO systems to meet at least one of the above requirements.

[0117] This application provides a wireless communication method executed in a user equipment 120, comprising: receiving configuration information sent by a network 130, the configuration information including information for determining uplink subband precoding; sending an uplink measurement signal to the network 130; and receiving codebook-based subband precoding indication information sent by the network 130, the codebook-based subband precoding indication information including at least one of the following: modulation and coding scheme (MCS) indication information, scheduling request indication (SRI) information, the number of layers of a first panel and precoding indication information for one subband of the first panel, precoding indication information for the remaining subbands in the first panel excluding the precoding indication information of the subbands mentioned above, indication information for subband precoding granularity, second precoding indication information for one subband of a second panel in a multi-panel scenario, and / or precoding indication information for the remaining subbands of the second panel based on a determined set. Through the above technical solution, codebook-based subband precoding and precoding indication in multi-panel scenarios are supported, which can improve uplink transmission performance and system performance. The order, combination, specific content, and execution of the above operations do not limit the embodiments of this application and can be flexibly adjusted according to actual needs to meet different scenarios and technical requirements.

[0118] This application provides a wireless communication method executed in a user equipment 120, comprising: receiving configuration information sent by a network 130, the configuration information including information for determining uplink subband precoding; receiving downlink measurement signals sent by the network 130, performing channel estimation based on the downlink measurement signals, and determining precoding indication information of the uplink measurement signals based on the estimated channel information; sending the uplink measurement signals to the network 130; and receiving non-codebook-based subband precoding indication information sent by the network 130, the non-codebook-based subband precoding indication information including at least one of the following: modulation and coding scheme (MCS) indication information, a joint indication information of the number of layers of the first panel and scheduling request indication (SRI) information of a subband of the first panel, subband SRI information of the remaining subbands based on a determined set other than the SRI information of the subband indicated by the first indication information, indication information of subband precoding granularity, second SRI information of one subband of the second panel in a multi-panel scenario, and / or SRI information of the remaining subbands of the second panel based on a determined set. The above technical solutions, through non-codebook-based subband precoding and precoding instructions for multi-panel scenarios, improve uplink transmission performance and system performance. The order, combination, specific content, and execution of the above operations do not limit the embodiments of this application and can be flexibly adjusted according to actual needs to meet different scenarios and technical requirements.

[0119] This application provides a wireless communication method executed on a user equipment 120, comprising: receiving configuration information sent by a network 130, the configuration information including information for determining uplink subband precoding; sending the uplink measurement signal to the network 130; and receiving subband precoding indication information sent by the network 130, the subband precoding indication information including at least one of the following: joint indication information of the number of spatial bases and spatial base selection, joint indication information of the number of frequency bases and frequency base selection, codebook parameter combination information, non-zero coefficient selection factor indication information, subband precoding granularity indication information, and / or, in a multi-panel scenario, partial or all of the following information: joint indication information of the number of spatial bases and spatial base selection, joint indication information of the number of frequency bases and frequency base selection, codebook parameter combination information, non-zero coefficient selection factor indication information, and subband precoding granularity indication information for the second panel. Through the above technical solution, by providing spatial and frequency domain base selection and parameter indications, the uplink precoding flexibility and spectral efficiency are improved. The order, combination, specific content, and execution of the above operations do not limit the embodiments of this application and can be flexibly adjusted according to actual needs to meet different scenarios and technical requirements.

[0120] This application provides a wireless communication method, executed in a user equipment 120, comprising: receiving configuration information transmitted from a network 130 side, the configuration information including information for determining uplink subband precoding; receiving a downlink measurement signal transmitted from the network 130 side, performing channel estimation based on the downlink measurement signal, and determining precoding indication information of the uplink measurement signal based on the estimated channel information; transmitting the uplink measurement signal to the network 130 side; and receiving subband precoding indication information transmitted from the network 130 side, the subband precoding indication information including the following to The missing information includes: Modulation and Coding Scheme (MCS) indication information, antenna port number and selection joint indication information, frequency domain basis number, frequency domain basis selection and window length joint indication information, codebook parameter combination information, non-zero coefficient selection factor indication information, sub-band precoding granularity indication information, and / or, in multi-panel scenarios, partial or complete information of the second panel's spatial basis number and spatial basis selection joint indication information, frequency domain basis number and frequency domain basis selection joint indication information, codebook parameter combination information, non-zero coefficient selection factor indication information, and sub-band precoding granularity indication information. Through the above technical solution, the flexibility and efficiency of uplink transmission are improved by using sub-band precoding and joint parameter indication. The order, combination, specific content, and execution of the above operations do not limit the embodiments of this application and can be flexibly adjusted according to actual needs to meet different scenarios and technical requirements.

[0121] Optionally, "Network 130 side" can refer to a base station. "Network 130 side" can refer to the current serving cell, a candidate cell, a primary serving cell, or a secondary cell.

[0122] Optionally, user equipment 120 can perform device-to-device (D2D) communication with each other.

[0123] Alternatively, 5G communication systems or 5G networks may also be referred to as New Radio (NR) systems or NR networks.

[0124] The wireless communication system 100 also includes a network 130. The network 130 may be an IP mobile communication network operated by a mobile communication operator. For example, the network 130 may be the core network used by the mobile communication operator that operates and manages the wireless communication system 100, or it may be the core network used by a virtual mobile communication operator such as an MVNO (Mobile Virtual Network Operator).

[0125] Network 130 can be connected to network-side device 110 as a relay device for transmitting user data. User equipment 120 sends and receives user data via network 130. It should be noted that user data communication is not limited to IP communication, but can also be non-IP communication.

[0126] Figure 1 exemplarily illustrates a network-side device 110, two user devices 120, and a network 130. Optionally, the wireless communication system 100 may include multiple network devices, and each network device may include other numbers of user devices within its coverage area. This application embodiment does not limit this.

[0127] Optionally, the wireless communication system 100 may also include other network entities such as a network controller, a mobility management entity, and network elements; this application embodiment does not limit this. For example, network 130 may include other network entities such as a network controller, a mobility management entity, and network elements; this application embodiment does not limit this.

[0128] It should be understood that devices with wireless communication functions in the network / system of this application embodiment can be referred to as wireless communication devices. Taking the wireless communication system 100 shown in FIG1 as an example, the wireless communication device may include a network-side device 110, a user equipment 120, and a network 130 with communication functions. The network-side device 110 and the user equipment 120 can be the specific devices described above, which will not be repeated here. The wireless communication device may also include other devices (network 130) in the wireless communication system 100. For example, the network 130 may include other network entities such as a network controller and a mobility management entity. This is not limited in this application embodiment.

[0129] It should be understood that the terms "system" and "network" are often used interchangeably in this document. The term "and / or" in this document merely describes the relationship between related objects, indicating that three relationships can exist. For example, A and / or B can represent: A alone, A and B simultaneously, or B alone. Additionally, the character " / " in this document generally indicates that the preceding and following related objects are in an "or" relationship. In some embodiments, the term "configuration" can refer to "pre-configuration" and "network configuration." The terms "definition" or "pre-defined" in the embodiments of this application can be implemented by pre-storing corresponding codes, tables, or other information indicative indices in the device (e.g., including UE and network devices). This application does not limit specific implementations. For example, "definition" or "pre-defined" can refer to which protocols are defined. It should also be understood that "protocol" in this invention can refer to standard protocols in the field of communications, such as Long Term Evolution (LTE) protocols, new radio (NR) protocols, and related protocols used in future communication systems. This application does not limit this.

[0130] The concepts and terms mentioned in the embodiments of this application, which are applicable to the entire application, are explained.

[0131] Subband precoding granularity mainly refers to the number of resource units included in the subband precoding. Resource units can be resource blocks (RBs) or physical resource blocks (PRBs) in NR, or other representations of frequency domain resources; no specific restrictions are placed here. The subband precoding granularity indication information in this embodiment is mainly used to determine the granularity of subband precoding, and its specific indication form and content are also not specifically limited and can take any form.

[0132] Furthermore, the subsequent systems mentioned in the embodiments of this application refer to the next generation or multiple generations of communication systems after NR, such as 6G and / or 7G.

[0133] For the design of uplink subband precoding schemes, this application introduces a dynamic subband precoding granularity determination mechanism to flexibly determine the granularity of subband precoding. Simultaneously, the scheme also considers the joint indicator layer number and the precoding method of one subband, while the precoding of other subbands is based on a pre-determined set selection, thus achieving a flexible and efficient subband precoding scheme.

[0134] Furthermore, embodiments of this application also introduce a joint indication method for the number of dynamic spatial and frequency domain substrates and their selection, as well as a joint indication method for the number of dynamic frequency domain substrates, frequency domain substrate window length, and frequency domain substrate selection, to determine the spatial and frequency domain substrates required for subband precoding.

[0135] Meanwhile, this application embodiment uses two levels of indication information to carry subband precoding information: the first level of indication information is used to determine the time-frequency domain resources required for coarse-grained subband precoding and the second level of indication information, and the second level of indication information supplements the first level, thereby jointly determining a higher-precision subband precoding scheme. Alternatively, the first level of DCI is used to indicate the time-frequency domain resource location of the second level DCI, and the second level DCI specifically carries the indication information for subband precoding.

[0136] Through the embodiments of this application, user equipment can support higher-precision uplink codebooks, thereby improving uplink transmission efficiency. Simultaneously, the embodiments of this application achieve the following technical effects:

[0137] 1. Flexible uplink precoding accuracy based on channel conditions: When calculating uplink subband precoding, this embodiment determines the subband granularity or number of subbands on the network side based on factors such as channel conditions and indication overhead. Compared to the downlink RRC configuration, the determination of uplink subband granularity is more flexible, thereby better ensuring uplink precoding performance.

[0138] 2. Reduce uplink precoding indication overhead: By flexibly indicating the subband granularity on the network side, a larger subband granularity can be configured when channel conditions are good, thereby effectively reducing the indication overhead of subband precoding.

[0139] 3. Improve uplink precoding performance: Through flexible subband indication and dynamic indication of the number of spatial frequency domain bases, precoding performance can be effectively guaranteed even when the channel quality is poor, thereby significantly improving the overall performance of the uplink system.

[0140] 4. Enhanced robustness of uplink precoding indication: This embodiment employs a two-level DCI to indicate uplink subband precoding. The first-level DCI is used to determine coarse-grained subband precoding information and the time-frequency domain resource information of the second-level DCI. The second-level DCI, combined with the first level, further determines finer-grained subband precoding. Even if the second-level DCI fails to decode, the system can still use coarse-grained subband precoding, thus improving system robustness.

[0141] 5. Reduced DCI blind detection complexity and latency: By using two-level DCI to indicate uplink subband precoding, the aggregation level of a single DCI is reduced, thereby lowering blind detection complexity and latency. Furthermore, the first-level DCI avoids blind detection of the second-level DCI by indicating its aggregation degree and time-frequency domain resource information, further improving system efficiency.

[0142] In view of the technical problems mentioned below, some technical solutions of this application can solve at least one of the following technical problems:

[0143] Codebook-based subband precoding indication: Current NR standards only support uplink wideband precoding. When using a codebook-based approach, the base station needs to indicate the tier number and TPMI of the user equipment. The tier number and TPMI are jointly indicated by N bits, where the value of N is related to the maximum supported rank number. If codebook-based uplink subband precoding is extended to support this, TPMI needs to be indicated separately for each subband, which places new demands on the indication method for subband TPMI. Therefore, when designing a codebook-based uplink subband precoding scheme, it is crucial to consider how to efficiently indicate the TPMI of each subband to balance system performance and indication overhead.

[0144] Determining the granularity of uplink subband precoding: Current NR standards only specify the granularity of CSI reporting subbands, but not the granularity of uplink subband precoding. Furthermore, the granularity of downlink subband precoding is determined by the granularity of CQI subbands and the number R of PMI subbands contained in each CQI subband, while uplink precoding does not require reporting CQI information. Simultaneously, since downlink subband precoding requires pre-allocating resources for CSI reporting, its granularity is typically determined through static RRC configuration. Uplink precoding, on the other hand, uses dynamic DCI indication, resulting in more flexible resource overhead. The network side can adopt a more flexible subband precoding indication method to avoid excessive indication overhead due to an excessive number of subbands, thereby reducing the complexity and detection latency of DCI blind detection. The current challenge is how to reasonably determine the granularity of uplink subband precoding to balance system performance and resource indication efficiency.

[0145] Furthermore, considering that the uplink precoding indication information is reported through DCI, and DCI needs to be determined through blind detection, there is a certain risk of missed detection. Moreover, the larger the amount of information carried by the DCI, the greater the possibility of missed detection. Therefore, this application also studies how to report uplink precoding information more efficiently to reduce performance loss caused by DCI missed detection, thereby further improving the system's reliability and transmission efficiency.

[0146] In some embodiments, FIG2A is a schematic flowchart of a wireless communication method provided in an embodiment of this application. A wireless communication method, executed on a user equipment, includes: operation 201A: receiving configuration information sent by a base station, the configuration information including information for determining uplink subband precoding; operation 202A: sending an uplink measurement signal to the base station; and operation 203A: receiving codebook-based subband precoding indication information sent by the base station, the codebook-based subband precoding indication information including at least one of the following: modulation and coding scheme (MCS) indication information, scheduling request indication (SRI) information, the number of layers of a first panel and precoding indication information of a subband of the first panel, precoding indication information of the remaining subbands in the first panel other than the precoding indication information of the subband, indication information of subband precoding granularity, second precoding indication information of a subband of a second panel in a multi-panel scenario, and / or precoding indication information of the remaining subbands of the second panel based on a determined set. The order, combination, specific content, and execution of the above operations 201A, 202A, and 203A do not constitute a limitation on the embodiments of this application. They can be flexibly adjusted according to actual needs to meet different scenarios and technical requirements.

[0147] In some embodiments, FIG2B is a schematic flowchart of a wireless communication method provided in an embodiment of this application. A wireless communication method, executed at a base station, includes: operation 201B: sending configuration information to a user equipment, the configuration information including information for determining uplink subband precoding; operation 202B: receiving an uplink measurement signal sent by the user equipment; and operation 203B: sending codebook-based subband precoding indication information to the user equipment, the codebook-based subband precoding indication information including at least one of the following: modulation and coding scheme (MCS) indication information, scheduling request indication (SRI) information, the number of layers of a first panel and precoding indication information for one subband of the first panel, precoding indication information for the remaining subbands in the first panel other than the precoding indication information for the subbands, indication information for subband precoding granularity, second precoding indication information for one subband of a second panel in a multi-panel scenario, and / or precoding indication information for the remaining subbands of the second panel based on a determined set. The order, combination, specific content, and execution of operations 201B, 202B, and 203B described above do not limit the embodiments of this application and can be flexibly adjusted according to actual needs to meet different scenarios and technical requirements.

[0148] In some embodiments, the wireless communication method further includes determining information related to calculating uplink subband precoding, the information including at least one of the following: indication information of uplink subband precoding granularity, codebook information of uplink subband precoding, and / or indication information of subband precoding. In some embodiments, the codebook information of uplink subband precoding is based on a New Radio (NR) system wideband codebook or a Discrete Fourier Transform (DFT) codebook. In some embodiments, the wireless communication method further includes reporting to the base station the capability to support uplink subband precoding, the capability to support uplink subband precoding including at least one of the following: number of antenna ports, antenna coherence relation, support for fully coherent uplink subband precoding, support for partially coherent subband precoding, maximum supported number of subbands, and / or maximum supported number of layers. In some embodiments, the wireless communication method further includes transmitting uplink data information to the base station, the uplink data information being carried on a Physical Uplink Shared Channel (PUSCH) for subband precoding determined based on the wireless communication method. In some embodiments, the information used to determine uplink subband precoding includes configuration information of uplink measurement resources and / or subband precoding granularity information.

[0149] In some embodiments, Figure 2C is a flowchart illustrating the wireless communication method provided in this application. For uplink multi-antenna transmission, existing uplink codebooks only support wideband precoding and not subband precoding. As the number of uplink antennas increases further, the frequency selectivity of the uplink channel becomes increasingly pronounced. Therefore, this application proposes a scheme supporting codebook-based uplink subband precoding, based on existing codebook-based wideband precoding. This specifically includes user equipment capability reporting and subband precoding information indication. The innovation lies in designing a key signaling interaction process between the base station and the user equipment, the specific interaction process of which is at least as shown in Figure 2C.

[0150] Based on the scheme of this application embodiment, the subband precoding transmission process mainly includes at least one of the following steps. To make the technical solution of this application embodiment more adaptable and flexible, the order, number, and whether all steps are performed are not limited to the embodiments of this application. Specifically, the codebook-based subband precoding transmission process may include, but is not limited to, at least one of the following steps:

[0151] 1. Predefine and calculate information related to uplink subband precoding: This step may include calculating information related to the granularity of subband precoding, codebook information for uplink subband precoding (e.g., wideband codebook, DFT codebook, or other applicable codebook formats based on existing NR systems), and indication rules for subband precoding (e.g., associating the first indication information with the first subband). The specific calculation method, information type, and content can be flexibly adjusted according to actual needs and are not limited to a specific form.

[0152] 2. User equipment reporting capabilities supporting uplink subband precoding: User equipment can report supported capabilities based on actual needs. Reported content may include, but is not limited to, the number of antenna ports, antenna coherence relation, whether fully coherent or partially coherent subband precoding is supported, the maximum number of supported subbands, and the maximum number of layers. The specific content, order, and whether this step is performed in the capability reporting do not constitute a limitation on the embodiments of this application and can be adjusted according to the actual system configuration.

[0153] 3. The user equipment receives configuration information from the base station: The configuration information may include, but is not limited to, necessary information for determining uplink subband precoding, such as uplink measurement resource configuration information and subband precoding granularity information. The specific content and type of the configuration information can be flexibly adjusted according to different system requirements. The execution order of this step and the specific format and content of the configuration information do not constitute a limitation on the embodiments of this application.

[0154] 4. User equipment transmits uplink measurement signals: The type of uplink measurement signal may include, but is not limited to, SRS signals or other uplink measurement signals. The specific method, timing, and whether this step is included in the transmission of measurement signals by the user equipment can be adjusted according to the actual scenario, and this embodiment does not impose any restrictions on this.

[0155] 5. The user equipment receives subband precoding indication information based on the codebook: The subband precoding indication information may include, but is not limited to, the following: MCS indication information, SRI information, layer number and TPMI joint indication information for a certain subband, TPMI information for the remaining subbands based on a defined set, and subband precoding granularity indication information (e.g., the maximum number of RBs contained in the subband or subband index information). In multi-panel scenarios, it may also include TPMI information for another panel and other relevant indication information. The type, content, and transmission method of the indication information do not limit the implementation embodiment and can be adjusted according to actual system requirements.

[0156] 6. Precoding indication information is carried through a two-level DCI: Precoding indication information can be carried through one or more levels of DCI. For example, the first-level DCI may include MCS indication information, SRI information, layer number, subband precoding granularity indication information, and relevant information in multi-panel scenarios; the second-level DCI can supplement the indication of TPMI information for other subbands or other panels. The number of levels, content, and specific indication information format in this step are not limited and can be dynamically adjusted according to the actual scenario.

[0157] 7. User Equipment transmits uplink data information based on subband precoding: The user equipment can transmit data information based on the subband precoding information determined in the above steps via PUSCH or other uplink channels. The type of data information, the transmission method, and whether this step is performed are not limited to the embodiment and can be selectively performed according to actual needs.

[0158] The order, combination, specific content, and execution of the above steps do not limit the embodiments of this application and can be flexibly adjusted according to actual needs to meet different scenarios and technical requirements.

[0159] In view of the technical problems mentioned below, some technical solutions of this application can solve at least one of the following technical problems:

[0160] Subband precoding indication based on non-codebook: Current NR standards only support uplink wideband precoding. When using a non-codebook approach, the base station needs to instruct the user equipment to select the SRS resource to use, specifically through SRI (SRS Resource Indication). If support for uplink subband precoding based on non-codebook is extended, the selected SRS resource needs to be indicated separately for each subband. This presents new design requirements for the specific indication method, necessitating a comprehensive consideration of system performance, indication overhead, and implementation complexity to develop a reasonable indication scheme.

[0161] Furthermore, considering that the uplink precoding indication information is reported through DCI, and DCI needs to be determined through blind detection, there is a certain risk of missed detection. Moreover, the larger the amount of information carried by the DCI, the greater the possibility of missed detection. Therefore, this application also studies how to report uplink precoding information more efficiently to reduce performance loss caused by DCI missed detection, thereby further improving the system's reliability and transmission efficiency.

[0162] In some embodiments, FIG3A is a flowchart illustrating a wireless communication method provided in an embodiment of this application. A wireless communication method, executed on a user equipment, includes: operation 301A: receiving configuration information sent by a base station, the configuration information including information for determining uplink subband precoding; operation 302A: receiving a downlink measurement signal sent by the base station, performing channel estimation based on the downlink measurement signal, and determining precoding indication information for the uplink measurement signal based on the estimated channel information; operation 303A: sending the uplink measurement signal to the base station; and operation 304: receiving a non-codebook-based subband precoding information sent by the base station. The subband precoding indication information, based on non-codebook information, includes at least one of the following: modulation and coding scheme (MCS) indication information, a joint indication of the layer number of the first panel and the scheduling request indication (SRI) information of a subband of the first panel, the subband SRI information of the remaining subbands based on a determined set, excluding the SRI information of the subband indicated by the first indication information, the indication information of the subband precoding granularity, the second SRI information of one subband of the second panel in a multi-panel scenario, and / or the SRI information of the remaining subbands of the second panel based on a determined set. The order, combination, specific content, and execution of operations 301A, 302A, 303A, and 304A described above do not limit the embodiments of this application and can be flexibly adjusted according to actual needs to meet different scenarios and technical requirements.

[0163] In some embodiments, FIG3B is a flowchart illustrating a wireless communication method provided in an embodiment of this application. A wireless communication method, executed at a base station, includes: operation 301B: sending configuration information to a user equipment, the configuration information including information for determining uplink subband precoding; operation 302B: sending a downlink measurement signal to the user equipment, performing channel estimation based on the downlink measurement signal, and determining precoding indication information for the uplink measurement signal based on the estimated channel information; operation 303B: receiving the uplink measurement signal sent by the user equipment; and operation 304B: sending a non-code-based... The subband precoding indication information based on the codebook includes at least one of the following: modulation and coding scheme (MCS) indication information, a joint indication information of the layer number of the first panel and the scheduling request indication (SRI) information of a subband of the first panel, the subband SRI information of the remaining subbands based on a determined set, excluding the SRI information of the subband indicated by the first indication information, the indication information of the subband precoding granularity, the second SRI information of one subband of the second panel in a multi-panel scenario, and / or the SRI information of the remaining subbands of the second panel based on a determined set. The order, combination, specific content, and execution of operations 301B, 302B, 303B, and 304B described above do not limit the embodiments of this application and can be flexibly adjusted according to actual needs to meet different scenarios and technical requirements.

[0164] In some embodiments, the wireless communication method further includes determining information related to calculating uplink subband precoding, the information including at least one of the following: indication information of uplink subband precoding granularity, indication information of uplink non-codebook subband precoding, and / or indication information of subband precoding indication. In some embodiments, the indication information of uplink non-codebook subband precoding is indication information based on NR system broadband non-codebook precoding. In some embodiments, the wireless communication method further includes reporting to the base station the capability to support non-codebook subband precoding, the capability of non-codebook subband precoding including at least one of the following: the maximum number of uplink measurement resources that the user equipment supports for simultaneous transmission, support for uplink subband precoding, the maximum number of subbands supported, and / or the maximum number of layers supported. In some embodiments, the wireless communication method further includes sending uplink data information to the base station, the uplink data information being carried on a PUSCH for determining subband precoding based on the wireless communication method. In some embodiments, the information for determining uplink subband precoding includes configuration information of uplink measurement resources and / or subband precoding granularity information.

[0165] In some embodiments, Figure 3C is a flowchart illustrating the wireless communication method provided in this application. For uplink multi-antenna transmission, existing non-codebook uplink precoding schemes only support wideband precoding and do not yet cover subband precoding. As the number of uplink antennas increases further, the frequency selectivity of the uplink channel becomes increasingly apparent. Therefore, this application proposes a scheme supporting non-codebook-based uplink subband precoding based on existing non-codebook wideband precoding. Specific details include mechanisms such as user equipment capability reporting and subband precoding information indication, as well as key interaction procedures between the base station and the UE. The specific steps and order do not limit this embodiment, but are at least as shown in Figure 3C. The following describes the non-codebook-based subband precoding transmission process:

[0166] 1. Predefine and calculate information related to uplink subband precoding: This step may include, but is not limited to, information on determining the granularity of uplink subband precoding, information on non-codebook subband precoding indication rules (e.g., based on the broadband non-codebook precoding indication rules of existing NR systems), and indication rules for subband precoding (e.g., associating the first indication information with the first subband). The content and format of the specific information can be flexibly adjusted according to actual needs and are not limited to a fixed format.

[0167] 2. User equipment reporting capability to support non-codebook subband precoding: User equipment can report supported capabilities. The report content may include, but is not limited to: the maximum number of supported uplink measurement resources (such as SRS resources), the maximum number of supported subbands, the maximum number of transmission layers, and whether uplink subband precoding is supported. The order, content, and specific parameters of capability reporting are not limited and can be flexibly adjusted according to actual system requirements.

[0168] 3. User Equipment Receives Configuration Information: The configuration information may include, but is not limited to, the following: necessary information for determining uplink subband precoding, such as configuration information of uplink measurement resources (e.g., SRS resources), configuration information of downlink measurement resources associated with uplink measurement resources (e.g., CSI-RS resources), and subband precoding granularity information. The content, order, and transmission method of the configuration information can be adjusted according to scenario requirements and are not limited to a fixed format.

[0169] 4. User Equipment Receives Downlink Measurement Signal: After receiving the downlink measurement signal, the user equipment performs channel estimation based on the signal and uses the estimated channel information to determine the precoding information of the uplink measurement signal. The downlink measurement signal may include, but is not limited to, CSI-RS signals or other downlink measurement signals. The signal type and specific processing method in this step do not limit the implementation of this embodiment.

[0170] 5. User Equipment Transmits Uplink Measurement Signals: When transmitting uplink measurement signals, the user equipment can add uplink precoding to the signal. The type of measurement signal can include, but is not limited to, the SRS signal in the NR system or other forms of uplink measurement signals; the specific selection can be flexibly adjusted according to requirements.

[0171] 6. User equipment receives subband precoding indication information based on a non-codebook: The subband precoding indication information may include at least one of the following: MCS indication information, SRI information, joint indication information of layer number and SRI of a certain subband, SRI information of the remaining subbands based on a defined set, and indication information of subband precoding granularity (such as the maximum number of RBs contained in the subband or subband index information). In multi-panel scenarios, it may also include the subband SRI information of another panel and the SRI information of the remaining subbands. The specific content and method of the information can be flexibly adjusted according to the scenario requirements.

[0172] The indication information can be carried through two levels of DCI: Level 1 DCI includes MCS indication information, SRI information, layer number and joint SRI indication information for a specific sub-band, sub-band precoding granularity information, SRI information for a specific sub-band of another panel in a multi-panel scenario, and time-frequency domain resource information of Level 2 DCI. Level 2 DCI supplements the indication with SRI information for other sub-bands or another panel. The content and structure of the above two levels of DCI do not limit this embodiment and can be flexibly adjusted according to actual needs.

[0173] 7. User Equipment (UE) transmits uplink data information: Based on the received subband precoding information, the UE transmits uplink data information via PUSCH (Physical Uplink Shared Channel). The content and specific transmission method of the uplink data information can be flexibly designed according to the scenario requirements and do not constitute a limitation on the implementation example.

[0174] The execution order, content, combination, and whether all of the above steps are executed do not constitute a limitation on the embodiments of this application. Specific steps can be flexibly adjusted according to actual needs to meet application requirements in different scenarios and ensure optimization of system performance and resource utilization efficiency.

[0175] In view of the technical problems mentioned below, some technical solutions of this application can solve at least one of the following technical problems:

[0176] Reporting Content and Method Based on Rel-16 eType-II Codebook: Considering the similarities between uplink and downlink precoding in some aspects, the uplink precoding scheme can refer to and reuse the downlink Rel-16 eType-II codebook. However, for downlink precoding, CSI reporting is carried through UCI, and the network side needs to allocate reporting resources to the user equipment in advance to ensure that CSI can be reported correctly. In contrast, uplink precoding in existing standards uses DCI information for indication, and the indicated resources are dynamically allocated by the network side as needed, without the need to reserve resources for precoding indication in advance. Therefore, the rules used for CSI reporting in the Rel-16 eType-II codebook may not be applicable to uplink precoding indication. In addition, since uplink precoding indication does not require pre-allocation of resources, the information of precoding parameters can be flexibly adjusted according to the actual channel conditions. Therefore, when using the Rel-16 eType-II codebook scheme in this application embodiment, the following two questions are considered: First, what content needs to be reported for uplink precoding? Second, how to more flexibly indicate some information related to uplink precoding? Solving these problems will help optimize the uplink precoding instruction method, improve resource utilization efficiency and system performance.

[0177] Furthermore, considering that the uplink precoding indication information is reported through DCI, and DCI needs to be determined through blind detection, there is a certain risk of missed detection. Moreover, the larger the amount of information carried by the DCI, the greater the possibility of missed detection. Therefore, this application also studies how to report uplink precoding information more efficiently to reduce performance loss caused by DCI missed detection, thereby further improving the system's reliability and transmission efficiency.

[0178] In some embodiments, FIG4A is a schematic flowchart of a wireless communication method provided in an embodiment of this application. A wireless communication method, executed on a user equipment, includes: operation 401A: receiving configuration information sent by a base station, the configuration information including information for determining uplink subband precoding; operation 402A: sending the uplink measurement signal to the base station; and operation 403A: receiving subband precoding indication information sent by the base station, the subband precoding indication information including at least one of the following information: joint indication information of the number of spatial bases and spatial base selection, joint indication information of the number of frequency bases and frequency base selection, codebook parameter combination information, non-zero coefficient selection factor indication information, subband precoding granularity indication information, and / or, in a multi-panel scenario, part or all of the following information: joint indication information of the number of spatial bases and spatial base selection, joint indication information of the number of frequency bases and frequency base selection, codebook parameter combination information, non-zero coefficient selection factor indication information, and subband precoding granularity indication information of the second panel. The order, combination, specific content, and execution of operations 401A, 402A, and 403A described above do not limit the embodiments of this application and can be flexibly adjusted according to actual needs to meet different scenarios and technical requirements.

[0179] In some embodiments, Figure 4B is a flowchart illustrating a wireless communication method provided in this application. A wireless communication method, executed at a base station, includes: operation 401B: sending configuration information to a user equipment, the configuration information including information for determining uplink subband precoding; operation 402B: receiving the uplink measurement signal sent by the user equipment; and operation 403B: sending subband precoding indication information to the user equipment, the subband precoding indication information including at least one of the following: joint indication information of the number of spatial bases and spatial base selection, joint indication information of the number of frequency bases and frequency base selection, codebook parameter combination information, non-zero coefficient selection factor indication information, subband precoding granularity indication information, and / or, in a multi-panel scenario, part or all of the following information: joint indication information of the number of spatial bases and spatial base selection, joint indication information of the number of frequency bases and frequency base selection, codebook parameter combination information, non-zero coefficient selection factor indication information, and subband precoding granularity indication information for the second panel. The order, combination, specific content, and execution of operations 401B, 402B, and 403B described above do not limit the embodiments of this application and can be flexibly adjusted according to actual needs to meet different scenarios and technical requirements.

[0180] In some embodiments, the wireless communication method further includes determining information related to calculating uplink subband precoding, the information including at least one of the following: indication information of uplink subband precoding granularity, spatial basis number and selection indication information, frequency basis number and selection indication information, and / or uplink codebook parameter combination information. In some embodiments, the wireless communication method further includes reporting uplink subband precoding capability information to the base station, the uplink subband precoding capability information including at least one of the following capabilities: number of antenna ports, antenna coherence relation, maximum supported subband number, maximum supported layer number, maximum supported spatial basis number, maximum supported frequency basis number, and / or maximum supported spatial and frequency basis number. In some embodiments, the wireless communication method further includes transmitting uplink data information to the base station, the uplink data information being carried on the Physical Uplink Shared Channel (PUSCH) for which subband precoding is determined based on the wireless communication method. In some embodiments, the information for determining uplink subband precoding includes uplink measurement resource configuration information and / or subband precoding granularity information.

[0181] In some embodiments, Figure 4C is a flowchart illustrating the wireless communication method provided in this application. For uplink multi-antenna transmission, existing non-codebook uplink precoding schemes only support wideband precoding and do not involve subband precoding. As the number of uplink antennas increases, the frequency selectivity of the uplink channel becomes increasingly pronounced. Therefore, this application designes an uplink subband precoding scheme based on the downlink Rel-16 eType-II codebook algorithm. This scheme includes key interaction processes between the user equipment and the base station; the specific steps and order are not limited in this application, but are at least as shown in Figure 4C. The following is a detailed description of the uplink subband precoding transmission process based on Rel-16 eType-II:

[0182] 1. Predefine information related to uplink subband precoding: This step may include, but is not limited to: information on determining the granularity of uplink subband precoding; the number of spatial bases and selection rules; the number of frequency bases and selection rules; and uplink codebook parameter combination information. The specific content and format of this information can be flexibly adjusted according to actual needs and are not limited to a fixed combination.

[0183] 2. User Equipment Reporting Uplink Subband Precoding Capability Information: User equipment can report its supported capabilities based on actual needs. The reported content may include, but is not limited to, at least one of the following: number of antenna ports; antenna coherence relation; maximum supported subband number;

[0184] The maximum number of supported layers; the maximum number of supported spatial and frequency domain basis vectors; the maximum number of supported spatial and frequency domain basis vectors, etc. The specific type and parameters of the reported content are not limited to the embodiments of this application and can be dynamically adjusted according to the needs of the scenario.

[0185] 3. User Equipment Receiving Configuration Information: The user equipment can receive configuration information sent by the base station. This configuration information may include, but is not limited to: uplink measurement resource configuration information (e.g., SRS resources); maximum spatial and frequency base number information; codebook parameter combination information; and maximum subband number information. The content and transmission order of the configuration information can be adjusted according to actual needs and do not constitute a limitation of this embodiment.

[0186] 4. User Equipment Transmits Uplink Measurement Signal: The user equipment transmits an uplink measurement signal according to its configuration. This signal can be an SRS signal in the NR system or other forms of uplink measurement signal. This application does not impose specific restrictions on this, and the signal type and transmission method can be flexibly adjusted according to actual needs.

[0187] 5. User equipment receives subband precoding indication information: Subband precoding indication information may include, but is not limited to, at least one of the following: MCS indication information; joint indication information of the number and selection of spatial basis vectors; joint indication information of the number and selection of frequency basis vectors; codebook parameter combination information; non-zero coefficient selection factor indication information; subband precoding granularity information (such as the maximum number of RBs contained in the subband or subband index information). In multi-panel scenarios, it may also include some or all of the above information from another panel. The content and order of the indication information can be flexibly adjusted according to actual needs.

[0188] 6. Subband precoding indication information can be carried through two levels of DCI: Level 1 DCI: This may include MCS indication information, the number of maximum non-zero coefficients, spatial basis selection information, frequency basis selection information, subband precoding granularity information, and relevant information in multi-panel scenarios. It may also indicate the time-frequency domain resource information corresponding to Level 2 DCI. Level 2 DCI: This can supplement the indication of the location of the maximum non-zero coefficients, non-zero coefficient bitmap information, amplitude and phase indication information, and oversampling basis information.

[0189] 7. User Equipment Transmits Uplink Data: The user equipment transmits subband precoded uplink data information determined based on any of the above methods via the PUSCH. The specific data information type and transmission method do not constitute a limitation on this application and can be flexibly adjusted according to actual needs.

[0190] The steps, order, content, and whether all of the above processes are executed do not constitute a limitation on the embodiments of this application. The specific execution method can be flexibly adjusted according to different actual scenarios and needs to ensure the optimization of system performance and resource utilization efficiency.

[0191] In view of the technical problems mentioned below, some technical solutions of this application can solve at least one of the following technical problems:

[0192] Reporting Content and Method Based on the Rel-17 FeType-II Codebook: Considering the similarities between uplink and downlink precoding in some aspects, the uplink precoding scheme can refer to and reuse the downlink Rel-17 FeType-II codebook. However, for downlink precoding, CSI reporting is carried through UCI, and the network side needs to allocate reporting resources to the user equipment in advance to ensure that CSI can be reported correctly. In contrast, uplink precoding in existing standards uses DCI information for indication, and the indicated resources are dynamically allocated by the network side as needed, without the need to reserve resources for precoding indication in advance. Therefore, the rules used for CSI reporting in the Rel-17 FeType-II codebook may not be applicable to uplink precoding indication. In addition, since uplink precoding indication does not require pre-allocation of resources, the information of precoding parameters can be flexibly adjusted according to the actual channel conditions. Therefore, when using the Rel-17 FeType-II codebook scheme in this application embodiment, the following two questions are considered: First, what content needs to be reported for uplink precoding? Second, how to more flexibly indicate some information related to uplink precoding? Solving these problems will help optimize the uplink precoding instruction method, improve resource utilization efficiency and system performance.

[0193] Furthermore, considering that the uplink precoding indication information is reported through DCI, and DCI needs to be determined through blind detection, there is a certain risk of missed detection. Moreover, the larger the amount of information carried by the DCI, the greater the possibility of missed detection. Therefore, this application also studies how to report uplink precoding information more efficiently to reduce performance loss caused by DCI missed detection, thereby further improving the system's reliability and transmission efficiency.

[0194] In some embodiments, FIG5A is a schematic flowchart of a wireless communication method provided in an embodiment of this application. A wireless communication method, executed on a user equipment, includes: operation 501A: receiving configuration information sent by a base station, the configuration information including information for determining uplink subband precoding; operation 502A: receiving a downlink measurement signal sent by the base station, performing channel estimation based on the downlink measurement signal, and determining precoding indication information for the uplink measurement signal based on the estimated channel information; operation 503A: sending the uplink measurement signal to the base station; and operation 504A: receiving the subband precoding indication information sent by the base station. The subband precoding indication information includes at least one of the following: modulation and coding scheme (MCS) indication information, antenna port number and selection joint indication information, frequency domain substrate number, frequency domain substrate selection and window length joint indication information, codebook parameter combination information, non-zero coefficient selection factor indication information, subband precoding granularity indication information, and / or, in multi-panel scenarios, part or all of the following information: spatial domain substrate number and spatial domain substrate selection joint indication information, frequency domain substrate number and frequency domain substrate selection joint indication information, codebook parameter combination information, non-zero coefficient selection factor indication information, and subband precoding granularity indication information for the second panel. The order, combination, specific content, and execution of operations 501A, 502A, 503A, and 504A do not limit the embodiments of this application and can be flexibly adjusted according to actual needs to meet different scenarios and technical requirements.

[0195] In some embodiments, FIG5B is a flowchart illustrating a wireless communication method provided in an embodiment of this application. A wireless communication method, executed at a base station, includes: operation 501B: sending configuration information to a user equipment, the configuration information including information for determining uplink subband precoding; operation 502B: sending a downlink measurement signal to the user equipment, performing channel estimation based on the downlink measurement signal, and determining precoding indication information for the uplink measurement signal based on the estimated channel information; operation 503B: receiving the uplink measurement signal sent by the user equipment; and operation 504B: sending a subband precoding indication to the user equipment. The sub-band precoding indication information includes at least one of the following: modulation and coding scheme (MCS) indication information, antenna port number and selection joint indication information, frequency domain substrate number, frequency domain substrate selection and window length joint indication information, codebook parameter combination information, non-zero coefficient selection factor indication information, sub-band precoding granularity indication information, and / or, in multi-panel scenarios, part or all of the following information: spatial domain substrate number and spatial domain substrate selection joint indication information, frequency domain substrate number and frequency domain substrate selection joint indication information, codebook parameter combination information, non-zero coefficient selection factor indication information, and sub-band precoding granularity indication information for the second panel. The order, combination, specific content, and execution of operations 501B, 502B, 503B, and 504B do not limit the embodiments of this application and can be flexibly adjusted according to actual needs to meet different scenarios and technical requirements.

[0196] In some embodiments, the wireless communication method further includes determining information related to calculating uplink subband precoding, the information including at least one of the following: information for determining uplink subband precoding granularity, the number of antenna ports and selection indication information, the number of frequency domain substrates and selection indication information, and / or uplink codebook parameter combination information. In some embodiments, the wireless communication method further includes reporting uplink subband precoding capability information to the base station, the uplink subband precoding capability information including at least one of the following capabilities: the number of antenna ports, antenna coherence relation, the number of supported antenna ports and frequency domain substrates, the maximum number of supported subbands, and / or the maximum number of supported layers. In some embodiments, the wireless communication method further includes transmitting uplink data information to the base station, the uplink data information being carried on a Physical Uplink Shared Channel (PUSCH) for which subband precoding is determined based on the wireless communication method. In some embodiments, the information for determining uplink subband precoding includes uplink measurement resource configuration information and / or subband precoding granularity information.

[0197] In some embodiments, the subband precoding indication information is carried through a two-level DCI. In some embodiments, the first-level DCI includes at least one of the following information: MCS indication information, the number of maximum non-zero coefficients, the number and selection of antenna ports jointly indicated, the number of frequency domain substrates, the frequency domain substrate selection and window length jointly indicated, codebook parameter combination information, non-zero coefficient selection factor indication information, subband precoding granularity indication information, and in multi-panel scenarios, the number of spatial domain substrates and spatial domain substrate selection jointly indicated for the second panel, the number of frequency domain substrates and frequency domain substrate selection jointly indicated, codebook parameter combination information, non-zero coefficient selection factor indication information, part or all of the subband precoding granularity indication information, and / or the time-frequency domain resource information corresponding to the second-level DCI. In some embodiments, the second-level DCI includes at least one of the following information: the location indication information of the maximum non-zero coefficients, the bitmap indication information of non-zero coefficients, the amplitude and phase indication information of non-zero coefficients, and / or the oversampling substrate indication information. In some examples, the bit overhead of the indication information for the subband precoding granularity is determined according to at least one of the following methods: the subband granularity of the uplink subband precoding is indicated by the base station; determined based on the capabilities of the user equipment and / or predefined rules; candidate values ​​for the subband granularity of the uplink subband precoding are determined and indicated by signaling transmitted by the base station; the candidate values ​​for the subband granularity of the uplink subband precoding are configured by Radio Resource Control (RRC) signaling transmitted by the base station, and / or the subband granularity of the uplink subband precoding is indicated by Media Access Control (MAC) CE signaling or DCI transmitted by the base station.

[0198] In some embodiments, Figure 5C is a flowchart illustrating a wireless communication method provided in this application. For uplink multi-antenna transmission, existing non-codebook uplink precoding schemes only support wideband precoding and do not yet cover subband precoding. As the number of uplink antennas increases, the frequency selectivity of the uplink channel becomes increasingly apparent. Therefore, this application, based on the downlink Rel-17FeType-II codebook algorithm, designs an uplink subband precoding scheme. This scheme includes key signaling interaction procedures between the base station and user equipment. The specific steps and order do not limit the implementation of this application, as shown at least in Figure 5C. The following is a detailed description of the uplink subband precoding transmission process based on the Rel-17FeType-II codebook:

[0199] 1. Predefine relevant information for calculating uplink subband precoding: This step may include, but is not limited to, information on determining the granularity of uplink subband precoding, the number of antenna ports and selection indication rules, the number of frequency domain bases and selection indication rules, and uplink codebook parameter combinations. The specific content can be flexibly adjusted according to actual needs and is not limited to a fixed rule or parameter combination.

[0200] 2. User equipment reports its supported uplink subband precoding capabilities: The reported content may include, but is not limited to, at least one of the following: number of antenna ports, antenna coherence relation, number of supported antenna ports and frequency domain substrates, maximum number of supported subbands, maximum number of supported layers, etc. The content and order of capability reporting do not constitute a limitation on this embodiment and can be flexibly configured according to network requirements and actual scenarios.

[0201] 3. User equipment receives configuration information from the base station: This configuration information may include, but is not limited to: configuration information of uplink measurement resources (such as SRS resources), configuration information of downlink measurement resources (such as CSI-RS resources), codebook parameter combination information, and maximum subband quantity information. This information provides necessary support for the implementation of uplink subband precoding, and its content and transmission method can be dynamically adjusted according to system requirements.

[0202] 4. The user equipment receives the downlink measurement signal and performs channel estimation based on the signal: The user equipment determines the precoding information of the uplink measurement signal according to the estimated channel information. The downlink measurement signal can be a CSI-RS signal or other downlink measurement signals. The signal type and specific processing method in this step do not limit the embodiments of this application and can be adjusted according to actual needs.

[0203] 5. User equipment transmits uplink measurement signals: These measurement signals can be SRS signals in the NR system or other forms of uplink measurement signals. This application does not impose specific restrictions on this, and the type and transmission method of the measurement signal can be flexibly adjusted according to the actual network configuration and requirements.

[0204] 6. User equipment receives indication information based on subband precoding: This information may include at least one of the following: MCS indication information, joint indication information of the number and selection of antenna ports, joint indication information of the number of frequency domain bases and their selection and window length, codebook parameter combination information, non-zero coefficient selection factor indication information, and subband precoding granularity information (e.g., the maximum number of RBs contained in the subband or subband index information). In multi-panel scenarios, it may also include some or all of the above information from another panel. The specific content and format of the indication information can be flexibly adjusted according to actual needs.

[0205] Subband precoding indication information may be carried through two levels of DCI: The first level DCI may include MCS indication information, the number of maximum non-zero coefficients, the number and selection of antenna ports, the number of frequency domain basis elements and their selection, the window length, codebook parameter combination information, non-zero coefficient selection factor indication information, and subband precoding granularity information. The second level DCI can further supplement the indication with the location of the maximum non-zero coefficients, the bitmap information of non-zero coefficients, the amplitude and phase information of non-zero coefficients, and oversampling basis information.

[0206] 7. The user equipment transmits uplink data information through the PUSCH based on the received subband precoding information: the type and specific transmission method of the data information can be flexibly designed according to system requirements and do not constitute a limitation on the embodiments of this application.

[0207] The steps, order, content, and whether all steps are executed in the above process do not constitute a limitation on the embodiments of this application. The specific implementation can be flexibly adjusted according to different scenarios and actual needs to ensure high uplink performance and resource utilization.

[0208] Some embodiments of this application, based on existing protocols, further support beam management based on candidate cell CSI-RS, event-triggered subsequent cell L1 measurement reporting, and CSI acquisition of candidate cells before or during LTM handover command issuance. To this end, some embodiments of this application propose a beam information priority mapping mechanism for triggering events to ensure that the network side can obtain sufficient measurement information for handover decisions.

[0209] Furthermore, some embodiments of this application instruct the terminal to perform channel measurements on only a subset of candidate cells via MAC CE or DCI, which helps reduce the computational complexity of the terminal.

[0210] Furthermore, some embodiments of this application ensure that the network side can obtain event-triggered reporting information in a timely manner by limiting the retention of dedicated SRs when multiplexing dedicated scheduling requests (SRs) with other uplink control information (UCIs) and identifying the existence of dedicated SRs through specific indication fields during UCI multiplexing.

[0211] Through some embodiments of this application, terminals can support event-triggered L1 measurement result reporting in LTM scenarios, and support rapid CSI reporting after cell handover in LTM scenarios. Simultaneously, it also has at least one of the following beneficial effects:

[0212] (1) Improve system robustness: By constraining the mapping rules of the reporting content of normal MAC CE and truncated MAC CE in the event feedback, it can be ensured that when truncation occurs, the network side can still obtain certain L1 measurement information triggered by the event, thereby assisting the network side to make better switching decisions and improving the robustness of the system.

[0213] (2) Reduce terminal processing complexity: Since there are many candidate cells and the terminal only needs to select one cell for handover, the terminal does not need to measure the reference signals of all candidate cells. With instructions from the network side, the terminal can measure only some candidate cells, thereby reducing the processing burden.

[0214] (3) Reduce handover latency: The network side can quickly complete the handover by using the L1 event-triggered reporting mechanism; at the same time, by setting a dedicated SR to occupy uplink resources in UCI multiplexing, the network side can schedule transmission resources for event-triggered reporting more quickly, thereby ensuring handover efficiency and reducing handover latency.

[0215] In view of the technical problems mentioned below, some technical solutions of this application can solve at least one of the following technical problems:

[0216] Redefining the Start or End Time of Calculation: To improve cell handover performance and reduce handover latency, some embodiments of this application consider cell handover judgment based on L1 measurement events. The measurement quantity of the event can be L1-RSRP or L1-SINR information obtained from L1 layer measurements, and the event is based on LTM2 to LTM5 events defined by L2 layer. According to the current standard discussion progress, event-triggered L1 measurement results can be carried through MAC CE and can be notified to the network side through dedicated scheduling requests (SR). However, traditional CSI reporting is usually configured and / or triggered by the network side, and the calculation start time of non-periodic or semi-persistent CSI reporting is defined as after the end symbol of the slot where the DCI that triggered the reporting is located. Since event-triggered L1 measurement reporting no longer depends on DCI for triggering, the traditional definition of the start time of CSI calculation is obviously no longer applicable, and therefore a new calculation start or end time needs to be defined.

[0217] UCI multiplexing rules applicable to dedicated SRs: To improve cell handover performance and reduce handover latency, some embodiments of this application employ cell handover judgment based on L1 measurement events. The measurements include L1-RSRP or L1-SINR, and the events are based on LTM2 to LTM5 events defined in L2 layer. According to existing standards, event-triggered L1 measurement results can be carried via MAC CE and notified to the network side through dedicated SR scheduling messages. However, current SR multiplexing rules with other UCIs may prevent the network side from determining the existence of a dedicated SR. For example, when transmitting UL-SCH on PUSCH, if reporting is based solely on BSR (Buffer Status Report), the network side cannot distinguish whether a dedicated SR is included. Furthermore, when multiple SRs exist in a slot, the terminal can only report a maximum of two SRs; if neither includes a dedicated SR, the network side may still be unable to obtain this information. Therefore, further research is needed on UCI multiplexing rules applicable to dedicated SRs.

[0218] Which cells to measure: Based on the conclusions of the previous meeting, candidate cells can have periodic or semi-persistent CSI-RS resources pre-configured by the RRC before the handover command is issued. After the RRC configuration is complete, before receiving the handover command (CSC), the terminal can perform CSI measurements based on the configured CSI-RS resources; whether or not to perform these measurements depends on the terminal's capabilities. Previous discussions also indicated that CSI measurements and CSI reporting typically occur after the LTM handover command. This means that even if a candidate cell has been configured with periodic or semi-persistent CSI-RS, the terminal does not necessarily need to perform measurements immediately after configuration. The specific measurement timing is after the RRC configuration and before the handover command, but this measurement timing still needs further determination. Furthermore, considering the possibility of multiple candidate cells, performing CSI measurements on all cells would significantly increase processing complexity. Therefore, the terminal should only perform measurements on a subset of candidate cells, but which cells to measure specifically still needs further clarification.

[0219] The mapping rules for terminal reporting content are standardized as follows: Based on existing standards, event-triggered L1 measurement reporting can be carried through a MAC CE, which can be a truncated MAC CE. This MAC CE can carry the reported configuration ID, event configuration ID, at least one beam ID (such as SSBRI or CRI) that triggered the event, and its corresponding L1-RSRP value. The network side can configure the terminal to report up to N beams and can set whether beams that have not triggered events are allowed to be reported together in the MAC CE. The LTM event types defined in the current standard include: LTM2: The serving cell's beam quality is below an absolute threshold; LTM3: The candidate cell's beam quality is better than the serving cell by a certain offset; LTM4: The candidate cell's beam quality is better than an absolute threshold; LTM5: The serving cell's beam quality is below threshold 1, and the candidate cell's beam quality is better than another threshold 2. Currently, normal MAC CEs and truncated MAC CEs use the same format for different LTM events. To ensure that the network can still make effective handover decisions based on the reported content when MAC CE is truncated, the mapping rules of the terminal in the reported content need to be further standardized.

[0220] In some embodiments of this application, Figures 6A and 6B describe the event-triggered L1 measurement reporting process from the perspectives of the user equipment (UE) and the base station, respectively. Figure 6C further expands and integrates the complete process of UE reporting and base station decision-making, demonstrating how event-triggered L1 measurements drive the judgment and execution of cell handover. Specifically, when the event triggering condition (e.g., LTM2 to LTM5 events based on L2 definitions) is met, the UE will execute the multiplexing logic of dedicated scheduling requests and uplink control information according to preset rules, and report L1 measurement results containing dedicated SR request messages and CSI-RS or SSB based via PUSCH. The measurement results are reported to the base station via MAC CE, wherein the beam information related to the event trigger has a higher mapping priority than the beam information of non-triggered events, and the non-triggered event portion is truncated first when necessary. After receiving the above report, the base station combines measurement information such as L1-RSRP and L1-SINR to determine whether cell handover is required, and can generate a handover command containing candidate cells and their beam selection information and send it to the UE. This process establishes a mobility management mechanism that extends from event perception at the UE end to decision-making and response at the base station end. It helps improve the timeliness and accuracy of cell handover, and is especially suitable for scenarios involving high-speed movement or rapidly changing channel conditions.

[0221] In some embodiments, Figure 6A is a flowchart illustrating a wireless communication method provided in this application. A wireless communication method, executed on a user equipment, includes: Operation 601A: When an event triggering condition is met, the user equipment reports the Layer 1 measurement result triggered by the event, sends a dedicated SR message to the base station, and reports the measurement result based on the L1 measurement to the base station, including at least one of the following operations: when the dedicated scheduling request SR is multiplexed with the uplink control information UCI, the dedicated SR is retained; when the dedicated SR is multiplexed for transmission on the Physical Uplink Shared Channel (PUSCH), it carries a dedicated SR request message; Operation 602A: The measurement result is reported to the base station through a Media Access Control (MAC) CE. The beam information triggering the event is preferentially mapped relative to the beam information of non-triggered events in a normal or truncated MAC CE. When truncation occurs, the measurement beam information of the non-triggered event is preferentially truncated. The order, combination, specific content, and execution of operations 601A and 602A do not constitute a limitation on the embodiments of this application and can be flexibly adjusted according to actual needs to meet different scenarios and technical requirements.

[0222] In some embodiments, Figure 6B is a flowchart illustrating a wireless communication method provided in this application. A wireless communication method, executed at a base station, includes: Operation 601B: When an event triggering condition is met, the base station receives a dedicated SR message sent by a user equipment for an event-triggered Layer 1 (L1) measurement result report, and receives the L1 measurement result reported by the user equipment, including at least one of the following operations: when the dedicated scheduling request (SR) is multiplexed with uplink control information (UCI), the dedicated SR is retained; when the dedicated SR is multiplexed for transmission on the Physical Uplink Shared Channel (PUSCH), a dedicated SR request message is carried; Operation 602B: The measurement result reported by the user equipment is received through a Media Access Control (MAC) CE. The beam information triggering the event is preferentially mapped relative to the beam information of non-triggered events in a normal or truncated MAC CE. When truncation occurs, the measurement beam information of non-triggered events is preferentially truncated. The order, combination, specific content, and execution of operations 601B and 602B do not constitute a limitation on the embodiments of this application and can be flexibly adjusted according to actual needs to meet different scenarios and technical requirements.

[0223] In some embodiments, the event triggering condition is based on at least one of the following events defined in Layer 2 (L2): L2-triggered measurement event, Layer 3-triggered measurement event, Layer 4-triggered measurement event, and Layer 5-triggered measurement event. In some embodiments, the reference signal measured in Layer 1 is a Channel State Information Reference Signal (CSI-RS) or a Synchronization Signal Block (SSB). In some embodiments, the reported measurement result includes at least one of the following information: the resource index corresponding to the beam, the Layer 1 Reference Signal Received Power (L1-RSRP), the Layer 1 Signal-to-Interference-plus-Noise Ratio (L1-SINR), the reporting configuration identifier ID, and the event configuration ID. In some embodiments, the user equipment receives a cell handover command from the base station, the cell handover command including beam selection information for indicating candidate cells.

[0224] In some embodiments, FIG6C is a schematic flowchart of a wireless communication method provided in this application. To improve cell handover performance and reduce handover latency, some embodiments of this application consider cell handover determination based on L1 measurement events. The measurement quantity of the event can be L1-RSRP or L1-SINR information measured by L1, and the event is based on LTM2 to LTM5 events defined by the L2 layer. The event-triggered cell handover process is at least as shown in FIG6C.

[0225] Based on the solutions of this application, the event-triggered measurement result reporting process mainly includes at least one of the following steps. To make the technical solutions of this application more adaptable and flexible, the order, number, and whether all steps are performed are not limited to the embodiments of this application. Specifically, the codebook-based subband precoding transmission process may include, but is not limited to, at least one of the following steps:

[0226] 1. Predefined rules for event-triggered L1 measurement reporting: This part mainly involves the following two aspects:

[0227] Multiplexing rules for dedicated SRs with other UCIs: When a dedicated SR is multiplexed with other UCIs, the dedicated SR must be retained; if a dedicated SR is multiplexed to the PUSCH for transmission, a 1-bit indication in the BSR indicates that a dedicated SR message has been multiplexed to the PUSCH for transmission.

[0228] Mapping rules for measurement results: For normal MAC CE and truncated MAC CE, beam information related to event triggering in the reported content should be mapped first, and has a higher priority than beam information that has not triggered an event.

[0229] 2. Terminal receives channel measurement reference signal: The signal can be a periodic CSI-RS or a synchronization signal block (SSB).

[0230] 3. The terminal sends a dedicated SR request message: This is used to inform the network side that the terminal needs to report the L1 measurement results triggered by the event.

[0231] 4. Terminal sends measurement results triggered by events: The measurement results sent to the network side may include the resource index of the corresponding beam, as well as relevant beam measurement information such as L1-RSRP or L1-SINR.

[0232] 5. The terminal receives a handover command from the network side: the command instructs the terminal to switch to a specific candidate cell and may include beam selection information of the candidate cell.

[0233] The above steps are not all mandatory; the specific process depends on whether the event reporting is triggered in conjunction with L1-SINR reporting or CSI reporting based on CSI-RS measurements.

[0234] The order, combination, specific content, and execution of the above steps do not limit the embodiments of this application and can be flexibly adjusted according to actual needs to meet different scenarios and technical requirements.

[0235] In some embodiments of this application, Figures 7A and 7B describe the configuration of the channel measurement reference signal and the issuance process of the CSI measurement indication from the perspectives of the user equipment and the base station, respectively. Figure 7C further integrates and expands the above process, demonstrating how CSI measurement and reporting work in conjunction with cell handover operations to complete mobility management in an LTM scenario. Specifically, the base station can send channel measurement indication information to the UE via downlink control information or MAC CE, instructing the UE to perform CSI measurements on some or all candidate cells. This indication information may include bitmaps, cell indexes, resource indexes, combination numbers, TCI status, and CSI measurement indications. After receiving the measurement indication information, the UE performs CSI measurements on the target candidate cell based on the received channel measurement reference signal (sent by the serving cell and / or candidate cells), obtaining measurement information including L1-RSRP and L1-SINR. After receiving the cell handover command, the UE reports the previously obtained CSI measurement results to the target cell for subsequent scheduling strategy and communication parameter optimization. This process not only enables accurate mobility assessment based on LTM events, but also improves the continuity and performance stability of communication before and after handover, making it particularly suitable for multi-cell environments that require fine-grained channel awareness.

[0236] In some embodiments, Figure 7A is a flowchart illustrating a wireless communication method provided in this application. A wireless communication method, executed on a user equipment, includes: Operation 701A: receiving a channel measurement reference signal; Operation 702A: receiving channel measurement indication information sent by the serving cell. The channel measurement indication information is carried by downlink control information (DCI) or media access control unit (MAC CE) and includes at least one of the following information: a bitmap, a cell index, a resource index, a combination number, a transmission configuration indication (TCI) status, and channel state information (CSI) measurement indication information, instructing the user equipment to perform CSI measurements on the reference signal of the candidate cell. The order, combination, specific content, and execution of operations 701A and 702A do not limit the embodiments of this application and can be flexibly adjusted according to actual needs to meet different scenarios and technical requirements.

[0237] In some embodiments, Figure 7B is a schematic flowchart of a wireless communication method provided in this application. A wireless communication method, executed at a base station, includes: Operation 701B: sending a channel measurement reference signal to a user equipment; Operation 702B: the serving cell sends channel measurement indication information to the user equipment. The channel measurement indication information is carried through downlink control information (DCI) or media access control unit (MAC CE) and includes at least one of the following information: a bitmap, a cell index, a resource index, a combination number, a transmission configuration indication (TCI) status, and channel state information (CSI) measurement indication information, instructing the user equipment to perform CSI measurements on the reference signal of a candidate cell. The order, combination, specific content, and execution of operations 701B and 702B do not limit the embodiments of this application and can be flexibly adjusted according to actual needs to meet different scenarios and technical requirements.

[0238] In some embodiments, the user equipment (UE) begins CSI measurement of some or all candidate cells after receiving the channel measurement indication information, or begins CSI measurement of some or all candidate cells based on a specific time point. In some embodiments, the channel measurement reference signal is transmitted by the candidate cell or transmitted by the candidate cell or the serving cell respectively. In some embodiments, the CSI measurement includes at least one of the following: Layer 1 Reference Signal Received Power (L1-RSRP) and Layer 1 Signal-to-Interference-Ratio (L1-SINR). In some embodiments, the UE reports the CSI measurement results to the target cell after receiving a cell handover command.

[0239] In some embodiments, Figure 7C is a flowchart illustrating the wireless communication method provided in this application. In the LTM scenario, the measurement and reporting process of CSI is at least as shown in Figure 7C.

[0240] Based on the scheme of this application embodiment, the CSI reporting process in the LTM scenario mainly includes at least one of the following steps. To make the technical solution of this application embodiment more adaptable and flexible, the order, number, and whether all steps are performed are not limited to this application embodiment. Specifically, the codebook-based subband precoding transmission process may include, but is not limited to, at least one of the following steps:

[0241] 1. The terminal receives a channel measurement reference signal sent by the network side: the reference signal may be sent by the candidate cell, or by the serving cell and the candidate cell respectively.

[0242] 2. The terminal receives channel measurement indication information sent by the serving cell: This indication information is used to inform the terminal which candidate cells' channel state information needs to be measured. The indication information can be carried by downlink control information (DCI) or media access control unit (MAC CE), and can be represented in the form of bitmap, cell index, resource index, combination number, or transmission configuration indication (TCI) status.

[0243] 3. The terminal receives a handover command from the network side: the command is used to instruct the terminal to handover to the target candidate cell.

[0244] 4. Terminal reports channel measurement results: The measurement results are reported after the terminal switches to the target cell, carrying the previously measured CSI information, for subsequent scheduling and communication optimization of the target cell.

[0245] The above steps are not all mandatory; the specific process depends on whether the event reporting is triggered in conjunction with L1-SINR reporting or CSI reporting based on CSI-RS measurements.

[0246] The order, combination, specific content, and execution of the above steps do not limit the embodiments of this application and can be flexibly adjusted according to actual needs to meet different scenarios and technical requirements.

[0247] To facilitate understanding of the technical solutions of the embodiments of this application, the technical solutions related to the embodiments of this application are described below. The technical solutions of the first embodiment, second embodiment, third embodiment, fourth embodiment, fifth embodiment, sixth embodiment, seventh embodiment, eighth embodiment, ninth embodiment, tenth embodiment, eleventh embodiment, twelfth embodiment, thirteenth embodiment, fourteenth embodiment, and / or fifteenth embodiment are listed below for description, but this application is not limited thereto.

[0248] In some embodiments of this application, the solution of the first embodiment can be implemented in conjunction with the solutions of the second, third, fourth, fifth, sixth, seventh, eighth, ninth, tenth, eleventh, twelfth, thirteenth, fourteenth, and / or fifteenth embodiments, or it can be implemented independently of the solutions of the second, third, fourth, fifth, sixth, seventh, eighth, ninth, tenth, eleventh, twelfth, thirteenth, fourteenth, and fifteenth embodiments. In some embodiments of this application, the solutions of multiple embodiments can be combined or implemented independently.

[0249] First embodiment: First indication method for subband precoding based on codebook.

[0250] In some examples, the codebook-based subband precoding indication information includes at least one of the following: first indication information, which reuses the precoding indication information and layer number indication field in the DCI indication sent by the base station, and / or determines that the subband precoding corresponding to the precoding indication information and layer number indication field is the precoding indication information corresponding to the first subband; second indication information, used to indicate the precoding indication information of the remaining subbands other than the precoding indication information of the subband indicated by the first indication information; and / or third indication information, used to indicate the granularity of the subband corresponding to the uplink precoding.

[0251] For example, for 2Tx, 4Tx, and 8Tx uplink fully coherent transmission, the antenna distribution in 8Tx uplink fully coherent transmission mainly takes two forms: {N g =1, N1=4, N2=1} and {N g =1, N1=2, N2=2}. For the two methods mentioned above, existing codebooks only support wideband precoding. Therefore, this embodiment mainly discusses the indication content of uplink subband precoding when using fully coherent transmission mode in uplink 4Tx and 8Tx transmissions. Different antenna port configurations (2Tx, 4Tx, 8Tx) require appropriate precoding schemes in uplink transmission to ensure signal synthesis gain, reduce interference, and improve data throughput. Some schemes in this application extend this to support uplink subband precoding with more antenna ports, enabling uplink fully coherent transmission to adapt to larger-scale antenna configurations, improving frequency domain resolution and transmission efficiency.

[0252] In practice, the indication information for subband precoding may include at least one of the following.

[0253] First indication information: The precoding information and layer number indication field from the existing DCI indication are reused as the first indication information. The first indication information is used to indicate the layer number and the precoding information of one of the subbands. For example, for 4Tx and 8Tx uplink transmissions, the precoding information and layer number indication field of DCI format 0_1 ​​and format 0_2 in NR standard 38.212 can be reused. Furthermore, based on a predefined method, the precoding of the subband corresponding to this field is specified as the precoding information of the first subband. In specific implementations, for layer number constraints in subband transmission, such as when the subband supports a maximum of 4 or 8 layers, the indication overhead can be reduced through layer number constraints.

[0254] The second indication information is used to indicate the precoding information of the remaining subbands other than those indicated by the first indication information. The bit overhead of the second indication information is related to the number of subbands N3 and the number of layers L. The specific bit overhead can be expressed as follows: Where S represents the number of codebook subsets in the candidate codebook set when the number of layers is L. Each codebook subset corresponds to the codebooks for all layers of a subband. It is important to note that the above codebook set is a definite set, which is determined based on the number of layers indicated by the first indication information. For example, for 8Tx uplink fully coherent transmission, when {N g When L = 2, based on NR standard 38.211 Table 6.3.1.5-10, the number of codebook subsets in the determination set is S = 32, that is, there are 32 TPMIs. Therefore, the number of bits required to indicate the codebook subset corresponding to a single subband is... The total bit overhead is then 5(N³-1). Similarly, for 8Tx uplink subband precoding, when {N g When {N1 = 1, N2 = 4, N2 = 1}, combined with the number of layers determined by the first indication information, the bit overhead required to indicate the codebook subset corresponding to a single subband can be determined. The specific number of codebook subsets in the determined set corresponding to different layer numbers can be found in Tables 6.3.1.5-9 to 6.3.1.5-16 of NR standard 38.211. And when {N... g When N1 = 1, N2 = 2, and N3 = 2, the bit overhead required for the codebook subset corresponding to a single subband can be determined by combining the number of layers determined by the first indication information. The number of codebook subsets in the specific set corresponding to different layer numbers can be found in Tables 6.3.1.5-17 to 6.3.1.5-24 of NR Standard 38.211.

[0255] The third indication information: This information is used to indicate the subband granularity corresponding to the uplink precoding, specifically in units of RB (resource blocks). For example, the possible precoding subband granularity can be at least one of 1 to 1638 RBs. The bit overhead of this indication information depends on the specific indication method.

[0256] In some examples, the bit overhead of the third indication information is determined according to at least one of the following methods: the subband granularity of the uplink subband precoding is indicated by the base station; determined based on the capabilities of the user equipment and / or predefined rules; candidate values ​​for the subband granularity of the uplink subband precoding are determined and indicated by signaling transmitted by the base station; the candidate values ​​for the subband granularity of the uplink subband precoding are configured by Radio Resource Control (RRC) signaling transmitted by the base station, and / or the subband granularity of the uplink subband precoding is indicated by Media Access Control (MAC) CE signaling or DCI transmitted by the base station.

[0257] Specific instructions may include at least one of the following:

[0258] Method 1: The network side directly specifies the subband granularity of uplink subband precoding. For example, the subband granularity can be configured directly in the RRC / MAC CE / DCI configuration. The subband granularity can be any value from 1 to 1638 RBs. A maximum subband precoding granularity N can be determined through predefinition or network-side configuration. max Then the network side passes The network uses 3 bits to indicate the specific number of basis blocks (RBs) included in the uplink subband precoding. For example, when the subband granularity is no more than 8 RBs, the network side uses 3 bits to indicate the specific subband granularity. This method provides a certain degree of flexibility, allowing the network to dynamically adjust the precision of the feedback subband precoding according to channel conditions.

[0259] Method 2: Determined based on user equipment capabilities and predefined rules, assuming the user equipment reports capabilities indicating a maximum number of subbands of M. max The uplink bandwidth includes N RBs. RB Then the number of RBs contained in the subband is For example, if the user equipment's reported capabilities indicate that the maximum number of subbands it supports is no more than 8, and the number of RBs corresponding to the uplink bandwidth is 52, then the number of RBs contained in each subband is... Note that the maximum number of subbands mentioned above can be determined either by predefinition or by network-side indication, specifically through RRC / MAC CE / DCI indication. This approach reduces the overhead of network-side indication, eliminating the need for further network-side indication of subband granularity, while also taking into account the processing capabilities of user equipment.

[0260] Method 3: Based on a predefined method, determine some possible candidate values ​​for the granularity of the precoded subbands. Assume the number of candidate values ​​is B, and then indicate them via RRC / MAC CE / DCI signaling. The bit overhead of the indication is... For example, if the granularity of subband precoding can be {4, 8, 16, 32} RBs, then it requires Bits are used for indication. This provides a degree of flexibility, allowing the network to dynamically adjust the precision of the feedback subband precoding based on channel conditions. At the same time, it reduces indication overhead compared to method one.

[0261] Method 4: Configure the granularity of possible precoding subbands via RRC. Assuming the number of candidate subband granularities is B, then dynamically indicate which subband granularity is currently configured on the network side via MAC CE or DCI. For example, if the possible subband granularities configured via RRC are {4, 8, 16, 32}, then the granularity will be dynamically indicated in MAC CE or DCI via... Bits are used to indicate the granularity of a specific subband. This provides a degree of flexibility, allowing the network to dynamically adjust the precision of the feedback subband precoding based on channel conditions. At the same time, it reduces indication overhead compared to method three.

[0262] Method 5: Reuse the subband granularity configuration reported by the downlink CSI, as shown in Table 1 below, and further expand the possible supported bandwidth, for example, X = 576. For downlink, this table mainly represents the subband granularity corresponding to the CQI when the CSI is reported. For uplink, this table can represent the number of RBs corresponding to each subband in the subband precoding.

[0263] Table 1: Configurable subband sizes.

[0264] Secondly, a parameter R can be introduced, similar to the number of PMI subbands included in each CQI subband in downlink CSI reporting. That is, based on Table 1 above, R further controls the number of RBs included in the uplink subband precoding subband. The value of R can be configured on the network side. For example, the network side can instruct the user equipment on the specific value of R through RRC, MAC CE, or DCI. The value of R can be at least one of 1, 2, 4, 8, or 16, and the subband size can be represented as S. RB / R, where S RB The value of R represents the subband size in Table 1 above; the value of R can also be at least one of {1 / 2, 1 / 4, 1 / 3, 1 / 6, 1 / 8}, and the size of the subband can be expressed as S. RB / R. The specific indication method can be direct indication via RRC, MAC CE, or DCI; or RRC can be configured with candidate R values, and then dynamically indicated via MAC CE or DCI. For example, RRC can be configured with candidate R values ​​of {1,2,4,8}, and then MAC CE or DCI can indicate which value R takes using 2 bits; alternatively, candidate R values ​​can be determined based on a predefined method, and then indicated via RRC, MAC CE, or DCI. For example, R values ​​can be predefined as {1,2,4,8}, and then RRC, MAC CE, or DCI can indicate which value R takes using 2 bits; if the R indication is configured by default, the subband granularity given in Table 1 above will be used by default. In some examples, the codebook-based subband precoding indication information includes at least one of the following: a first indication information is the precoding information for each layer of a subband, based on a spatial discrete Fourier transform (DFT) codebook, where a set of orthogonal DFT vectors corresponding to the layer number of the first panel are selected from the spatial DFT codebook; a second indication information is used to indicate the precoding indication information for the remaining subbands other than the precoding indication information for the subband indicated by the first indication information; a third indication information is used to indicate the granularity of the subband corresponding to the uplink precoding; and / or a fourth indication information is used to indicate which oversampled group the codebook set for subband precoding is based on.

[0265] In this embodiment, the number of subbands N3 depends on the network-side configuration. The specific configuration method can be RRC, MAC CE, DCI, or a combination of these methods, such as the fourth indication information mentioned above. Based on the fourth indication information and combined with bandwidth and other information, the number of subbands N3 can be inferred. For example, the fourth indication information is used to indicate the codebook set for subband precoding. This codebook set is composed of codebook vectors from a specific oversampled group, and the number of subbands N3 can be inferred by combining bandwidth and other information. To control the indication overhead, the number of subbands configured on the network side can be constrained; for example, the number of subbands can not exceed a certain maximum value N. max Alternatively, the number of subbands N3 ∈ [1, 288] must be at least one value. Assuming there are K possible values ​​for a subband, the bit overhead for the base station when indicating the number of subbands is: Alternatively, the network can directly indicate the number of subbands. For example, if the number of subbands is no more than 8, the network side uses 3 bits to indicate the specific number of subbands.

[0266] In some examples, the codebook-based subband precoding indication information is carried through two-level downlink control information (DCI). In some examples, the first-level DCI includes at least one of the following: the MCS indication information, SRI information, the layer number of the first panel and the precoding indication information for one subband of the first panel, the subband granularity of the uplink subband precoding, the time-frequency domain resource information corresponding to the second-level DCI, aggregation level information, and / or, in a multi-panel scenario, the second precoding indication information for one subband of the second panel. In some examples, the second-level DCI includes at least one of the following: precoding indication information for the remaining subbands other than the precoding indication information for the subband indicated by the first indication information, and / or precoding indication information for the remaining subbands of the second panel based on a defined set. In some examples, the time-frequency domain resource location corresponding to the second-level DCI is located within the Physical Uplink Shared Channel (PUSCH) resource scheduled by the first-level DCI.

[0267] For example, the subband codebook indication content mentioned above can be carried on two levels of DCI. The first level DCI mainly carries MCS indication information, SRI information, layer number and TPMI joint indication information of one subband, subband precoding granularity indication information, and time-frequency domain resource indication information and aggregation level information corresponding to the second level DCI. When the higher-level parameter multipanelScheme = sfnScheme, it is also necessary to indicate the second TPMI information of one subband of another panel in the multi-panel scenario.

[0268] The second-level DCI includes at least one of the following information: the remaining subband TPMI information of the subband based on a defined set, excluding the first DCI indication, and the remaining subband TPMI information of the other panel based on a defined set.

[0269] The time-frequency domain resource location corresponding to the second-level DCI can be located within the PUSCH resource scheduled by the first-level DCI. This allows the time-frequency domain location of the second-level DCI to be directly determined based on the indication from the first-level DCI, eliminating the need for blind detection of the second-level DCI and enabling direct alignment and decoding to obtain its indication information. The specific indication information of the first-level DCI can be implemented using at least one of the following methods:

[0270] Method 1: In some examples, the first-level DCI indicates at least one of the following information: time-domain resource allocation indication information, used to indicate the time-domain resource information occupied by the second-level DCI; frequency-domain resource allocation indication information, used to indicate the frequency-domain resource information occupied by the second-level DCI; and / or aggregation level information.

[0271] For example, the first-level DCI can indicate at least one of the following information: time-domain resource allocation indication information, frequency-domain resource allocation indication information, and aggregation level information. Specifically, the time-domain resource allocation indication information indicates the location of the time-domain resources occupied by the second-level DCI; the frequency-domain resource allocation indication information indicates the location of the frequency-domain resources occupied by the second-level DCI; and the aggregation level information describes the aggregation method of the resources.

[0272] For example, similar to the scheduling of PUSCH in the existing NR DCI format 0_1, sub-frequency domain resource assignment and sub-time domain resource assignment fields can be added to the first-level DCI. The meanings of these fields are similar to those of the frequency domain resource assignment and time domain resource assignment fields, but the time and frequency domain resource locations they determine are subsets of those locations. This design allows for more flexible resource allocation and improves resource utilization efficiency.

[0273] Method 2: In some examples, the first-level DCI indicates at least one of the following information: time-domain resource allocation length indication information, frequency-domain resource allocation length indication information, and / or aggregation level information.

[0274] For example, the first-level DCI indicates at least one of the following information: time-domain resource allocation length indication information, frequency-domain resource allocation length indication information, aggregation level, etc. For instance, in the existing NR DCI format 0_1, the scheduling of PUSCH is determined by the location information of the time-frequency domain resources through the frequency domain resource assignment and time domain resource assignment. The starting symbol information of the time-domain resources can be determined through the above information. If the frequency-domain resource is of type 0 allocation, the bitmap information corresponding to its RBG allocation can be determined. Based on the above information, combined with the time-domain resource allocation length indication information of the first-level DCI and the frequency-domain resource allocation length indication information, the time-frequency domain resources corresponding to the second-level DCI can be determined.

[0275] In addition, similar to the above indication method, for some coherent scenarios, such as for N g =2 and N gIn the scenario where = 4, corresponding to the scenarios of CodebookType = Codebook2 and CodebookType = Codebook3 in the existing NR standard 8TX wideband precoding, the precoding information and layer number indication field in the existing NR standard's DCI indication can be reused as the first indication information to indicate the layer number and the precoding information of one subband. Then, based on the layer number information determined by the first indication information, the set of precoding candidates for other subbands can be further determined, thereby indicating the precoding indication information for other subbands besides the subbands indicated by the first information in the second indication information. For example, for N g For scenarios with a layer count of 2, refer to Tables 6.3.1.5-29 to 6.3.1.5-36 of NR standard 38.211 to obtain the determination set for layers 1 to 8. Based on this determination set, further indicate the precoding information corresponding to the remaining sub-bands in the second indication information. The indication overhead for each sub-band is... Where S represents the number of codebook subsets contained in the set when the number of layers is fixed. Similarly, for N g In the scenario where the number of layers is 4, the corresponding layer number and the precoding matrix indication for one of the sub-bands can be determined through the first indication information, such as the first sub-band. Once the layer number is determined, the determination set for layers 1 to 8 can be obtained by referring to Tables 6.3.1.5-39 to 6.3.1.5-46 of NR standard 38.211. Based on this determination set, the precoding information corresponding to the remaining sub-bands can be further indicated in the second indication information. The indication overhead for each sub-band is... Where S represents the number of codebook subsets contained in a given set when the number of layers is fixed.

[0276] The first embodiment proposes a codebook-based subband precoding scheme. By introducing first, second, and / or third indication information, flexible indication of subband precoding is achieved. The first indication information reuses the precoding information and layer number indication field of DCI to specify the layer number and the precoding information for one subband. The second indication information further indicates the precoding information for the remaining subbands besides the first subband. The third indication information is used to control the subband granularity to adapt to different resource requirements. For partially coherent scenarios, the subband precoding set can be dynamically determined by combining the wideband precoding codebook type of the NR standard, thereby effectively reducing indication overhead and improving resource utilization efficiency. This scheme, through flexible indication methods and hierarchical design, balances resource allocation efficiency and signaling overhead control in complex scenarios.

[0277] Second embodiment: Second indication method for subband precoding based on codebook.

[0278] In some examples, the codebook-based subband precoding indication information includes at least one of the following: a first indication information is the precoding information for each layer of a subband, based on a spatial discrete Fourier transform (DFT) codebook, where a set of orthogonal DFT vectors corresponding to the layer number of the first panel are selected from the spatial DFT codebook; a second indication information is used to indicate the precoding indication information for the remaining subbands other than the precoding indication information for the subband indicated by the first indication information; a third indication information is used to indicate the granularity of the subband corresponding to the uplink precoding; and / or a fourth indication information is used to indicate which oversampled group the codebook set for subband precoding is based on.

[0279] For example, for 2Tx, 4Tx, and 8Tx uplink fully coherent transmission, the antenna distribution for 8Tx uplink fully coherent transmission mainly takes two forms {N}. g =1, N1=4, N2=1}, {N g =1, N1=2, N2=2}. For the two methods mentioned above, existing codebooks only support wideband precoding. Therefore, this embodiment mainly discusses the subband precoding indication content when performing uplink subband precoding in fully coherent transmission mode for uplink 4Tx and 8Tx transmissions. In specific implementation, the subband precoding indication information may include at least one of the following:

[0280] First indication information: Based on the existing standard NR Rel-16 eType-II spatial DFT codebook, select a set of orthogonal DFT vectors corresponding to the layer number L in the spatial DFT codebook to form the precoding matrix of each layer of a certain subband, for example, predefined as the precoding matrix of all layers of the first subband.

[0281] In some examples, the first indication information is indicated in at least one of the following ways: the precoding indication information and the layer number are jointly indicated, wherein the precoding indication information is indicated based on the combination number selection method.

[0282] The specific instruction method can be at least one of the following:

[0283] Method 1: Joint indication of precoding information and layer number, where the precoding information is indicated based on the combination number selection method. For example, for 8Tx uplink transmission, the DFT codebook matrix contains 8 codebook vectors. For layer 1, there are 8 candidate DFT vectors, and for layer 2, there are... There are several possibilities, for the L layer, there are a total of Considering all possible layer numbers, 8Tx has a total of 255 candidate combinations, as shown in Table 2 below. Therefore, when the maximum layer number is 1, it can be indicated by 3 bits; when the maximum layer number is 2, it can be indicated by 6 bits; and when the maximum layer number is 3 to 8, it can be indicated by 7 bits.

[0284] Table 2: Number of codebook combinations for different layers in 8Tx uplink transmission.

[0285] Method 2: Consider a dual-polarized antenna using the same codebook or beam in both polarization directions. Assuming the number of horizontal and vertical antenna ports are N1 and N2 respectively, the dimensions of the DFT codebook matrix are N1N2. Different layer precoding information is indicated based on the combination number selection method and jointly indicated with the layer number information. The corresponding bit indication overhead is shown in Table 3 below.

[0286] Table 3: Precoding and layer joint indication when the number of antenna ports in a single polarization direction is N1N2.

[0287] The second indication information is used to indicate the precoding information of the remaining subbands other than those indicated by the first indication information. The bit overhead of the second indication information is related to the number of subbands N3 and the number of layers L. The specific bit overhead can be expressed as follows: Where S represents the number of codebook subsets in the determination set when the number of layers is L, and each codebook subset corresponds to the codebooks of all layers in a subband. For example, for 8Tx uplink fully coherent transmission, when L=2, based on Table 2, the number of codebook subsets in the determination set is S=28, that is, there are 28 TPMIs. Therefore, the number of bits required to indicate the codebook subset corresponding to a single subband is... The total bit overhead is 5(N³-1).

[0288] When considering dual polarization in the first indication information, i.e., for method two in the first indication information, the above indication method also applies, except that the number of determined sets for different layers changes. For example, when L=2, based on Table 3, the number of codebook subsets in the set can be determined as follows: indivual.

[0289] The fourth indication information: This indicates which oversampled group's codebook vectors the codebook set for subband precoding is based on, and the specific bit overhead is... For example, the codebook vectors in the codebook set of the 8Tx fully coherent uplink precoding are generated based on the NR Rel-15 single-panel DL Type I codebook. The oversampling factors (O1, O2) take the values ​​O1∈{1,2,4} and O2∈{1,2,4}, respectively, and the values ​​of O1 and O2 can be arbitrarily combined.

[0290] In addition, the indication information for subband precoding may also include third indication information, which is the same as the third indication information in the first embodiment, and will not be described again here.

[0291] In response to the above types of information, the precoding of all subbands can either share the codebook set generated by the codebook vectors under the same set of oversampling factors, or they can not share the codebook set generated by the codebook vectors under the same set of oversampling factors. For example, if the oversampling factor is (O1,O2)=(2,2), the precoding codebook set of all subbands can be obtained based on the codebook vectors under the oversampling group (1,2).

[0292] Based on the above information, assuming that the precoding indication information only contains the first indication information and the second indication information, it means that the oversampling factor (O1,O2) = (1,1), i.e., there is no oversampling. For example, if the first indication information is specified in a predefined way to indicate the layer number information and the precoding information of the first subband, then the second indication information indicates the precoding information of the other subbands excluding the first subband.

[0293] In some examples, the codebook-based subband precoding indication information is carried through a two-level DCI. In some examples, the first-level DCI includes at least one of the following: the MCS indication information, SRI information, the number of layers of the first panel and the precoding indication information for one subband of the first panel, oversampling basis indication information, the subband granularity of the uplink subband precoding, the time-frequency domain resource information corresponding to the second-level DCI, aggregation level information, and / or, in a multi-panel scenario, the second precoding indication information for one subband of the second panel. In some examples, the second-level DCI includes at least one of the following: precoding indication information for the remaining subbands other than the precoding indication information for the subband indicated by the first indication information, and / or precoding indication information for the remaining subbands of the second panel based on a defined set.

[0294] For example, the subband codebook indication content mentioned above can be carried on a two-level DCI. The first-level DCI mainly carries MCS indication information, SRI information, layer number, TPMI joint indication information of one subband, oversampling basis indication information, subband precoding granularity indication information, and time-frequency domain resource indication information and aggregation level information corresponding to the second-level DCI. When the higher-level parameter multipanelScheme = sfnScheme, it is also necessary to indicate the second TPMI information of one subband of another panel in the multi-panel scenario. The time-frequency domain resource indication information corresponding to the second-level DCI can refer to the scheme in the first embodiment.

[0295] The second-level DCI includes at least one of the following information: second indication information, namely, the remaining subband TPMI information of the subband based on a defined set, excluding the first DCI indication, and the remaining subband TPMI information of the other panel based on a defined set.

[0296] The second embodiment proposes a second indication method for subband precoding based on a codebook. Through the joint design of first, second, third, and fourth indication information, it flexibly supports various subband precoding requirements. The first indication information, based on a spatial DFT codebook, indicates the precoding information for the first subband; the second indication information extends to the precoding information of the remaining subbands; the third indication information indicates the subband granularity; and the fourth indication information further specifies the oversampling basis information. The scheme introduces multiple indication methods, such as joint indication of precoding information and layer number, joint processing of dual-polarized antennas, and a two-level DCI bearer mechanism. These designs achieve flexible support for subband precoding requirements in different scenarios, balancing accuracy and indication overhead control. This embodiment effectively balances the flexibility and signaling overhead of subband precoding through a multi-layered indication mechanism and flexible design methods.

[0297] Third embodiment: First indication method for subband precoding based on non-codebook.

[0298] In some examples, the non-codebook-based subband precoding indication information includes at least one of the following: first indication information, which reuses the SRS resource indication field in the downlink control information (DCI) indication sent by the base station, and / or the first indication information indicates the precoding indication information and / or layer number information of the subband of the first panel; second indication information, used to indicate the precoding indication information of the remaining subbands other than the precoding indication information of the subband indicated by the first indication information; third indication information, used to indicate the granularity of the subband corresponding to the uplink precoding; and fourth indication information, used to indicate the SRS resource set where the SRI information corresponding to the SRS resource is located under the first indication information and / or the second indication information.

[0299] For example, for 2Tx, 4Tx, and 8Tx uplink fully coherent transmission, the antenna distribution for 8Tx uplink fully coherent transmission mainly takes two forms {N}. g =1, N1=4, N2=1}, {N g =1, N1=2, N2=2}. For the two methods mentioned above, existing codebooks only support wideband precoding. Therefore, this embodiment mainly discusses the subband precoding indication content when using non-codebook uplink precoding for uplink 4Tx and 8Tx transmissions. In specific implementation, the subband precoding indication information may include at least one of the following:

[0300] First indication information: The SRS resource indication field in the existing DCI indication is reused as the first indication information. The first indication information indicates the precoding information of one of the subbands and implicitly indicates the layer number information. For example, for 4Tx and 8Tx uplink transmission, the SRS resource indication field in DCI format 0_1 ​​and format 0_2 in NR standard 38.212 can be reused.

[0301] The second indication information is used to indicate the precoding information of the remaining subbands other than those indicated by the first indication information. The bit overhead of the second indication information is related to the number of subbands N3 and the number of layers L. The specific bit overhead can be expressed as follows: Where S represents the number of codebook subsets in the candidate codebook set when the number of layers is L, and each codebook subset corresponds to the codebooks of all layers in a subband. The value of S is related to the number of SRS resources in the SRS resource set used for uplink channel measurement. For example, for 8Tx uplink transmission when L max When S = 2, and the number of transmission layers is 2, and the number of SRS resources in the SRS resource set is 8, based on NR standard 38.212 Table 7.3.1.1.2-29B, the number of codebook subsets in the candidate codebook set is S = 28. That is, there may be 28 candidates for SRI. Therefore, the number of bits required to indicate the codebook subset corresponding to a single subband is... The total bit overhead is 5(N³-1). Similarly, other configurations of the number of SRS resources and predefined codebook indication tables for different maximum layer counts can be obtained. Based on the corresponding tables, the codebook determination set corresponding to the remaining subbands can be determined when the number of layers is fixed. Then, based on the determination set, the precoding indication information of the remaining subbands is indicated by the second indication information.

[0302] Fourth indication information: used to indicate the SRS resource set where the SRI corresponding to the SRS resource under the first indication information and / or the second indication information is located. For example, here the number of SRS resource sets is reduced to no more than X, where X can be any one of {1,2,3,4,5,6,7,8}, and the number of SRS resources in multiple SRS resource sets can be the same or different.

[0303] Furthermore, the indication information for subband precoding may also include third indication information, which is the same as the scheme in the first embodiment and is used to determine the granularity of subband precoding, and will not be elaborated here.

[0304] In some examples, the bit overhead of the third indication information is determined according to at least one of the following methods: the subband granularity of the uplink subband precoding is indicated by the base station; determined based on the capabilities of the user equipment and / or predefined rules; candidate values ​​for the subband granularity of the uplink subband precoding are determined and indicated by signaling transmitted by the base station; and / or the candidate values ​​for the subband granularity of the uplink subband precoding are configured by Radio Resource Control (RRC) signaling transmitted by the base station, and the subband granularity of the uplink subband precoding is indicated by Media Access Control (MAC) CE signaling or DCI transmitted by the base station.

[0305] In some examples, the non-codebook-based subband precoding indication information is carried through two-level downlink control information (DCI). In some examples, the first-level DCI includes at least one of the following: the MCS indication information; the first indication information, i.e., a joint indication of the layer number of the first panel and the SRI information of one subband of the first panel; the third indication information, i.e., the granularity indication information of the subband precoding; the fourth indication information, i.e., the SRS resource set indication information, the time-frequency domain resource information corresponding to the second-level DCI, the aggregation level information, and / or, in a multi-panel scenario, the second precoding indication information of one subband of the second panel. In some examples, the second-level DCI includes at least one of the following: the second indication information, i.e., the subband SRI information of the remaining subbands based on a determined set, excluding the first-level DCI indication, and / or the precoding indication information of the remaining subbands of the second panel based on a determined set. In some examples, the time-frequency domain resource location corresponding to the second-level DCI is located within the PUSCH resources scheduled by the first-level DCI.

[0306] In some examples, the first-level DCI indicates at least one of the following information: time-domain resource allocation indication information, used to indicate the time-domain resources occupied by the second-level DCI; frequency-domain resource allocation indication information, used to indicate the frequency-domain resources occupied by the second-level DCI; and / or aggregation level information. In some examples, the first-level DCI indicates at least one of the following information: time-domain resource allocation length indication information, frequency-domain resource allocation length indication information, and / or aggregation level information.

[0307] For example, the subband codebook indication content mentioned above can be carried on a two-level DCI. The first-level DCI mainly carries MCS indication information; first indication information, namely the layer number and the SRI joint indication information of one subband; third indication information, namely the granularity indication information of subband precoding; fourth indication information, namely the SRS resource set indication information; and the time-frequency domain resource indication information and aggregation level information corresponding to the second-level DCI. When the higher-level parameter multipanelScheme = sfnScheme, it is also necessary to indicate the second SRI information of one subband of another panel in the multi-panel scenario. The time-frequency domain resource indication information corresponding to the second-level DCI can refer to the scheme in the first embodiment.

[0308] The second-level DCI includes at least one of the following information: second indication information, namely, the subband SRI information of the remaining subbands based on a defined set, excluding the first DCI indication, and the subband TPMI information of the remaining subbands of another panel based on a defined set.

[0309] The third embodiment proposes a first indication method for subband precoding based on non-codebook. It utilizes the SRS resource indication field in existing DCI to indicate the precoding information and implicit layer number information of a subband through a first indication information. The second indication information indicates the precoding information of the remaining subbands, the third indication information determines the granularity of subband precoding, and the fourth indication information indicates the SRS resource set corresponding to the SRI. By reusing SRS resources, combining a flexible indication method for subband precoding, and employing a two-level DCI bearer mechanism, this scheme is suitable for efficient resource allocation in complex scenarios while also optimizing signaling overhead. This embodiment achieves a high-efficiency balance between the flexibility of non-codebook subband precoding and signaling overhead through SRS resource reusing and a two-level DCI bearer mechanism.

[0310] Fourth embodiment: Second indication method for subband precoding based on non-codebook.

[0311] In some examples, the non-codebook-based subband precoding indication information includes at least one of the following: a first indication information, used to indicate which SRS resources were selected in the SRS resource set, indicated by a bitmap, combination number, or SRS resource index; a second indication information, which reuses the SRS resource indication field in the DCI indication as the second indication information, the second indication information indicating the precoding indication information and / or layer number information of one subband; a third indication information, used to indicate the granularity of the subband corresponding to the uplink precoding; and / or a fourth indication information, used to indicate the precoding indication information of the remaining subbands other than the precoding indication information of the subband indicated by the first indication information; and / or a fifth indication information, used to indicate the SRS resource set in which the SRS resources selected under the first indication information, the second indication information, and / or the third indication information are located.

[0312] For example, the following is a detailed description of indication methods using bitmaps, combination numbers, and SRS resource indexes. In the bitmap indication method, the base station indicates the status of a specific subband or resource using a bitmap. Each bit represents a subband (or resource), with a value of "1" indicating selection and "0" indicating unselection, allowing precise control over the status of each subband. The combination number indication method indicates the selection of subbands or resources by encoding combinations, significantly reducing the indication bit overhead using a combination number formula. In the SRS resource index indication method, the subband or resource is indicated using an SRS resource index. The base station assigns an SRS resource index to each subband or resource. The base station indicates the SRS resource index via RRC, MAC CE, or DCI signaling. The UE obtains the corresponding resource location based on the received index value.

[0313] For example, for 2Tx, 4Tx, and 8Tx uplink fully coherent transmission, the antenna distribution for 8Tx uplink fully coherent transmission mainly takes two forms {N}. g =1, N1=4, N2=1}, {N g =1, N1=2, N2=2}. For the two methods mentioned above, existing codebooks only support wideband precoding. Therefore, this embodiment mainly discusses the subband precoding indication content when using non-codebook uplink precoding for uplink 4Tx and 8Tx transmissions. In specific implementation, the subband precoding indication information may include at least one of the following:

[0314] The first indication information indicates which SRS resources were selected from the SRS resource set. Assuming the number of SRS resources is R and the number of selected resources is K (R > K), this can be indicated using a bitmap, a combination number, or an SRS resource index. A bitmap indicates the required number of bits, where 1 / 0 represents selection and the opposite represents non-selection. A combination number indicates the required number of bits... This represents the number of possible selections of K SRS resources from R SRS resources; the bit overhead required for indicating this via SRS resource indexing is...

[0315] The second indication information reuses the SRS resource indication field from the existing DCI indication as the second indication information. This second indication information indicates the precoding information of one subband and implicitly indicates the layer number information. For example, for 4Tx and 8Tx uplink transmissions, the SRS resource indication fields from DCI format 0_1 ​​and format 0_2 in NR standard 38.212 can be reused. It is important to note that the SRS resources at this point are no longer the number of SRS resources in the SRS resource set, but rather K SRS resources selected from R SRS resources in the first indication information.

[0316] Fourth indication information: Used to indicate the precoding information of the remaining subbands other than those indicated by the first indication information. The bit overhead of the fourth indication information is related to the number of subbands N3 and the number of layers L. The specific bit overhead can be expressed as follows: Where S represents the number of codebook subsets in the candidate codebook set when the number of layers is L, and each codebook subset corresponds to the codebooks of all layers in a subband. The value of S is related to the number of SRS resources in the SRS resource set used for uplink channel measurement. For example, for 8Tx uplink transmission when L max When S = 2 and the number of transmission layers is 2, based on the first indication information, the number of SRS resources selected is assuming the number of SRS resources is 5. According to NR standard 38.211 Table 7.3.1.1.2-29B, the number of codebook subsets in the candidate codebook set is S = 10, meaning there may be 28 SRI candidates. Therefore, the number of bits required to indicate the codebook subset corresponding to a single subband is... The total bit overhead is 4(N³-1).

[0317] Fifth indication information: Used to indicate the SRS resource set where the SRS resource selected under the first, second and / or third indication information is located. For example, here the number of SRS resource sets is reduced to no more than X, where X can be any one of {1,2,3,4,5,6,7,8}, and the number of SRS resources in multiple SRS resource sets can be the same or different.

[0318] In addition, the indication information for subband precoding may also include third indication information, which is the same as the fourth indication information in the first embodiment, and will not be described again here.

[0319] In some examples, the non-codebook-based subband precoding indication information is carried through two levels of downlink control information (DCI). The first level DCI includes at least one of the following: the MCS indication information, the first indication information (i.e., SRS resource subset selection indication information), the second indication information (i.e., the joint indication information of the layer number of the first panel and the SRI information of a subband of the first panel), the third indication information (i.e., the granularity indication information of the subband precoding), the fifth indication information (i.e., the SRS resource set indication information), the time-frequency domain resource information corresponding to the second level DCI, the aggregation level information, and / or, in a multi-panel scenario, the second precoding indication information of one subband of the second panel. The second level DCI includes at least one of the following: the fourth indication information (i.e., the subband SRI information of the remaining subbands based on a determined set, excluding the first DCI level indication), and / or the precoding indication information of the remaining subbands of the second panel based on a determined set.

[0320] For example, the subband codebook indication content mentioned above can be carried on a two-level DCI. The first-level DCI mainly carries MCS indication information; first indication information, i.e., SRS resource subset selection indication information; second indication information, i.e., layer number and SRI joint indication information of one subband; third indication information, i.e., subband precoding granularity indication information; fifth indication information, i.e., SRS resource set indication information; and time-frequency domain resource indication information and aggregation level information corresponding to the second-level DCI. When the higher-level parameter multipanelScheme = sfnScheme, it is also necessary to indicate the second SRI information of one subband of another panel in the multi-panel scenario. The time-frequency domain resource indication information corresponding to the second-level DCI can refer to the scheme in the first embodiment.

[0321] The second-level DCI includes at least one of the following information: fourth indication information, namely, the subband SRI information of the remaining subbands based on a defined set, excluding the first DCI indication, and the subband TPMI information of the remaining subbands of another panel based on a defined set.

[0322] The fourth embodiment proposes a second indication method for subband precoding based on non-codebook. The first indication information indicates the selection from the SRS resource set, while the second indication information reuses the SRS resource field from the DCI indication. Combined with the third, fourth, and fifth indication information, flexible configuration of subband precoding is achieved. The first indication information supports three methods: bitmap, combination number, and SRS resource index, adapting to indication requirements in different scenarios. The fifth indication information further limits the size of the SRS resource set, optimizing signaling overhead. The two-level DCI bearer mechanism effectively distributes the indication information, improving resource utilization efficiency in uplink fully coherent transmission scenarios. This embodiment achieves an optimized balance between flexibility, efficiency, and signaling overhead in subband precoding indication through the combination design of multiple indication information and the two-level DCI bearer mechanism.

[0323] Fifth embodiment: Indication of eType-II codebook-spatial basis based on Rel-16.

[0324] In some examples, the indication method for the number of spatial bases and the selection indication information adopts at least one of the following methods: the number of spatial bases is indicated by the base station, and the number of spatial bases and which spatial bases are selected are jointly indicated; the codebook parameter combination list of Rel-16eType-II is reused, and a codebook parameter combination with a spatial base number of 1 is added; and / or the number of spatial bases and the selected spatial base information are indicated separately, and it is determined that each spatial base belongs to a data set composed of multiple spatial base numbers.

[0325] For example, for uplink fully coherent transmissions greater than 2Tx, the design of uplink subband precoding can refer to the codebook design of NR downlink Rel-16eType-II. The codebook architecture still adopts the three-level codebook structure of Rel-16 eType-II. in Represents the spatial basis matrix. These are the projection coefficients obtained by projecting the precoding matrix onto the basis matrices in the spatial and frequency domains. It is the frequency domain basis matrix, N t It represents the number of transmit antenna ports, L represents the number of spatial basis vectors selected for a single polarization direction, and M represents the number of transmit antenna ports. v N represents the number of frequency domain basis vectors corresponding to the v-th layer, and N3 represents the number of PMI subbands.

[0326] Based on the above codebook structure, for NR downlink precoding, user equipment reports corresponding PMI information based on parameters configured on the network side, including the selected spatial basis indication, frequency basis indication, and the number of non-zero coefficients obtained based on the selected spatial-frequency basis. The number of spatial-frequency basis units is indicated to the user equipment by the network side through RRC. For uplink subband precoding, if a three-level codebook structure based on Rel-16 eType-II is adopted, and the set of spatial and frequency basis units is similar to Rel-16 eType-II using a DFT basis, it is also necessary to determine the number of spatial-frequency basis units and which specific spatial-frequency basis units have been selected. The specific indication method can adopt at least one of the following schemes:

[0327] Option 1: The number of spatial bases is dynamically indicated by the network side, and the number of spatial bases and which spatial bases are selected are jointly indicated. For example, if the number of antenna ports in a single polarization direction is N1N2 and the number of selected spatial bases is L, and the number and selection of spatial bases are shared by polarization, then the specific indication overhead for different values ​​of N1N2 and L can be found in Table 4.

[0328] Table 4: Specific indication costs for different values ​​of N1, N2, and L.

[0329] The Spatial Domain Basis Indicator (SDBI) field is used to indicate the spatial domain basis. This indicates the selection of l spatial bases from N1N2 spatial bases. For different values ​​of L, the required bit indication overhead is... When N1N2=4, the corresponding table for L ∈{1,2,...,N1N2} is shown in Table 5.

[0330] Table 5: When N1N2=4, the value of L is L∈{1,2,...,N1N2}.

[0331] As shown in Table 5 above, when L=1, the indication overhead of the SDBI field is 2 bits; when L=2, the indication overhead of the SDBI field is 4 bits; when L=3 or 4, the indication overhead of the SDBI field is 4 bits. Note that Table 5 may only contain a portion of the data. For example, when N1N2=4, the maximum value of L can only be 2. Furthermore, the dynamic indication method can be MAC CE, DCI, or a combination of both.

[0332] The above-mentioned selection of the spatial basis is polarization-common, but it can also be polarization-specific. In the case of polarization-specific selection, different polarization directions may correspond to different numbers of spatial basis bases, meaning that the L values ​​corresponding to different polarization directions may be different. Alternatively, even if the value of L is the same, different polarization directions may choose different spatial basis bases. Polarization-common: This indicates that different polarization directions use the same selection or method. Polarization-specific: This indicates that different polarization directions use different selections or methods.

[0333] Option 2: The number of spatial bases and the selected spatial base information are indicated separately. The network side indicates that the number of selected spatial bases is L, and the bit overhead of the indication is... Furthermore, L is shared across polarizations, meaning that the same number L of spatial bases are selected for both polarization directions. Simultaneously, the network side needs to indicate which L spatial bases are being used. For example, if the number of antenna ports for a single polarization direction is N1N2, and the number of selected spatial bases is L, once the number of spatial bases is determined, it's necessary to determine which specific spatial bases are being selected. This can be indicated using spatial base indices, bitmaps, and / or combinations, with specific indication overheads as follows. N1N2, or Bit.

[0334] The number of airspace bases and the selection of airspace bases can be indicated by MAC CE or DCI. Alternatively, the number of airspace bases can be indicated by DCI, while the selection of airspace bases can be indicated by MAC CE.

[0335] Furthermore, for any of the above schemes, the network side can also indicate the number L of the maximum spatial basis through RRC, MAC CE, or DCI. max Then the network side passes Bits are used to indicate the number of spatial basis elements selected, where L max This indicates the maximum number of spatial bases selected by the network side when the number of single polarization direction antenna ports configured on the network side is N1N2.

[0336] Option 3: Reuse the Rel-16 eType-II codebook parameter combination list, such as Table 5.2.2.2.5-1 in 3GPP standard 38.214. Considering that the number of uplink antenna ports is relatively smaller than downlink, to control the overhead of uplink subband precoding indication, add L=1 codebook parameter combinations. For specific uplink codebook parameter combinations, at least one row from Table 6 can be used. Here, it is assumed that the total number of codebook parameter combinations is K, then the network-side indication overhead is... For example, when K=8, it indicates which codebook parameter combination requires 3 bits. The specific indication method can be RRC, MAC CE, or DCI.

[0337] Table 6: Codebook parameter combinations for the uplink.

[0338] Secondly, p in Table 6 above υ The number of frequency domain bases used to determine the selected frequency domain bases, based on the Rel-16 eType-II codebook, can be expressed as: Where N3 corresponds to the number of CQI subbands, R represents the number of PMI subbands contained in the CQI subband, and for uplink subband precoding M... υ Since uplink subband precoding does not require CQI feedback, the number of uplink subbands can be determined using the scheme in the first embodiment. Here, we assume the number of uplink subbands is N. s The number of frequency domain bases can then be expressed as:

[0339] Furthermore, while any of the above methods determines the number of selected spatial and frequency domain bases, the specific selection of which spatial and frequency domain bases is determined using methods mentioned in Scheme 2, such as indication via spatial base index, bitmap, and / or combination number. For example, the following is a detailed description of indication using bitmap, combination number, and SRS resource index. In the bitmap indication method, the base station indicates the status of a specific sub-band or resource using a bitmap. Each bit represents a sub-band (or resource), with a value of "1" indicating selection and "0" indicating unselection, allowing precise control over the status of each sub-band. The combination number indication method indicates the selection of sub-bands or resources by encoding combinations, significantly reducing the indication bit overhead using the combination number formula. In the SRS resource index indication method, the sub-band or resource is indicated using the SRS resource index. The base station assigns an SRS resource index to each sub-band or resource. The base station indicates the SRS resource index via RRC, MAC CE, or DCI signaling. The UE obtains the corresponding resource location based on the received index value.

[0340] Option 4: The number of airspace bases and the selected airspace base information are indicated separately. Based on a predefined method, the number L of airspace bases is specified as belonging to a dataset consisting of multiple airspace base numbers. Assuming the dataset contains Q data points, the specific value of L can be determined through... The indication is done using bits. For example, if L∈{1,2,4,6}, then the indication of L can be accomplished using 2 bits. Secondly, the specific spatial basis selected can be indicated using the same scheme as Scheme 2, that is, through spatial basis index, bitmap, and / or combination number.

[0341] The number of airspace bases and the selection of airspace bases can be indicated by MAC CE or DCI. Alternatively, the number of airspace bases can be indicated by DCI, while the selection of airspace bases can be indicated by MAC CE.

[0342] Furthermore, for any of the above schemes, the network side can also indicate the number L of the maximum spatial basis through RRC, MAC CE, or DCI. max Then the network side passes Bits are used to indicate the number of spatial basis elements selected, where L max This represents the maximum number of spatial basis arrays selected by the network side when the number of single polarization directional antenna ports configured on the network side is N1N2, while G represents the number of candidate values ​​of L that are less than L. max The number of candidate values. For example, L max =2, L∈{1,2,4,6}, then the value of G is 2, so only 1 bit is needed to indicate the value of L.

[0343] When there is only one spatial basis, the spatial basis of different layers are orthogonal to each other, and joint indication can be performed. However, this joint indication faces a problem: how to determine the order of joint indication.

[0344] Furthermore, for any of the above schemes, it is necessary to consider whether the number of spatial basis units in different layers is the same, and whether the selected spatial basis units for each layer are the same when the number of spatial basis units in different layers is the same. This can include at least one of the following situations:

[0345] Scenario 1: The number of spatial bases is the same across different layers, and the selected spatial bases are the same for each layer. In this scenario, the network-side instructions can directly adopt any of the above-mentioned schemes.

[0346] Scenario 2: The number of spatial bases differs across layers, and each layer's spatial base is selected independently. In this scenario, the network side needs to provide instructions for each layer using any of the methods described above.

[0347] Scenario 3: Different layers have the same number of spatial bases, but the spatial bases for each layer are selected independently. In this scenario, the network side can first indicate the number of spatial bases and the specific selected spatial bases for one layer using any of the methods described above. Subsequently, the selection of spatial bases for the remaining layers can be determined through network-side instructions mentioned in Scheme 2, such as spatial base indexes, bitmaps, and / or combinations.

[0348] Scenario 4: The number of spatial bases differs across layers, and the spatial bases for each layer are selected independently. In this scenario, the network side can provide instructions for each layer separately, following any of the above schemes.

[0349] The fifth embodiment proposes multiple schemes for indicating spatial basis using a Rel-16-based eType-II codebook architecture, covering dynamic indication of the number of spatial basis units, selection of specific spatial basis units, and joint indication of spatial basis units. By introducing various flexible indication methods, such as bitmaps, combination numbers, and spatial basis unit indices, the network side can effectively and dynamically configure the spatial and frequency basis units for uplink subband precoding. Furthermore, to address the diversity of spatial basis unit selection at different layers, scenario processing methods including polarization sharing and polarization-specific methods are designed, thereby achieving efficient and flexible resource allocation while minimizing indication overhead. This embodiment achieves an efficient balance between the dynamism of spatial and frequency basis unit selection and signaling overhead in uplink subband precoding through flexible and diverse indication mechanisms.

[0350] Sixth embodiment: Indication of eType-II codebook-frequency domain basis based on Rel-16.

[0351] In some examples, the number of frequency domain substrates and the selection indication information are adopted in at least one of the following ways: the number of frequency domain substrates is indicated by the base station, and the number of frequency domain substrates and which frequency domain substrates are selected are jointly indicated; the Rel-16 eType-II codebook parameter combination list is reused, and a codebook parameter combination with a spatial substrate number of 1 is added; and / or the number of frequency domain substrates and the selected frequency domain substrate information are indicated respectively, and it is determined that each frequency domain substrate belongs to a data set composed of multiple frequency domain substrate numbers.

[0352] For example, based on the fifth embodiment, when the design of uplink subband precoding is based on the Rel-16 eType-II codebook, in addition to the spatial basis selection indication mentioned in the fifth embodiment, the network side also needs to indicate several pieces of information related to the frequency basis of the user equipment, including the indication of the number of precoding subbands, the indication of the number of frequency basis, and the specific selected frequency basis.

[0353] Regarding the number of frequency domain bases, for the Rel-16 eType-II codebook The number of frequency domain bases depends on N3, R, and p. υ However, to allocate uplink resources for CSI reporting by the user equipment (UE), the aforementioned parameters are configured by the network side to the UE in a semi-static manner. But for uplink precoding, the downlink indication resources on the network side are dynamically configured, which provides more flexibility for the network side's indication. The network side can more flexibly indicate uplink precoding-related information to the UE based on channel conditions. Here, we assume that the number of subbands for uplink precoding is N. s The selection of the frequency domain basis can be indicated by at least one of the following schemes:

[0354] Option 1: The number of frequency domain bases is dynamically indicated by the network side, and the number of frequency domain bases and which specific frequency domain bases are selected are jointly indicated. For example, if the number of subbands in the uplink precoding is N... s And the number of frequency domain bases selected is M v The number and selection of frequency domain substrates are shared across layers, meaning different layers have the same number of frequency domain substrates, and different layers correspond to the same frequency domain substrates. Therefore, the number of sub-bands is N. s and M v For specific indications of the cost, please refer to Table 7.

[0355] Table 7: The number of subbands is N s and M v The value of indicates the specific overhead.

[0356] The FDBI field is used to indicate the frequency domain basis. Indicates that in N s X frequency domain bases are selected from the given frequency domain bases. For different values ​​of X, the required bit indication overhead is... When N s =4, and the value of X is L∈{1,2,...,N} s For the corresponding table, please refer to Table 7.

[0357] Table 7: When N s =4, and the value of X is L∈{1,2,...,N} s The table corresponding to}.

[0358] Table 7 above shows that when M v When M = 1, the overhead of the FDBI field is 2 bits; when M v When M = 2, the overhead of the SDBI field is 4 bits; when M v When the value is 3 or 4, the overhead of the SDBI field is 4 bits; note that the dynamic indication method can be MAC CE, DCI, or a combination of both.

[0359] Option 2: The number of frequency domain substrates and the selected frequency domain substrate information are indicated separately. The network side indicates that the number of selected frequency domain substrates is M. v The bit overhead of the indication is And M v It is layer-shared, meaning different layers choose the same number of frequency domain bases; at the same time, the network side also needs to indicate which M it is. v Each layer has a frequency domain basis, and the index of the frequency domain basis is also shared by all layers. That is, different layers choose the same frequency domain basis. For example, in a layer with N sub-bands...s In this case, the number of frequency domain bases selected is M. v Once the number of frequency domain bases is determined, it is necessary to determine which specific frequency domain bases will be selected. This can be indicated using frequency domain base indices, bitmaps, and / or combinations, with specific indication overheads as follows: N s ,or Bit.

[0360] The number of frequency domain substrates and the selection of frequency domain substrates can be indicated by MAC CE or DCI. Alternatively, the number of spatial domain substrates can be indicated by DCI, while the selection of spatial domain substrates can be indicated by MAC CE.

[0361] Furthermore, for any of the above schemes, the network side can also indicate the maximum number M of frequency domain bases through RRC, MAC CE, or DCI. max Then the network side passes Bits are used to indicate the number of frequency domain bases selected, where M max This indicates that the number of subbands configured on the network side is N. S The maximum number of frequency domain bases selected by the network side at that time.

[0362] Option 3: Reuse the Rel-16 eType-II codebook parameter combination list, such as Table 5.2.2.2.5-1 in 3GPP standard 38.214. Considering that the number of uplink antenna ports is relatively smaller than downlink, to control the overhead of uplink subband precoding indication, add L=1 codebook parameter combinations. For specific uplink codebook parameter combinations, at least one row from Table 9 below can be used. Here, it is assumed that the total number of codebook parameter combinations is K, then the network-side indication overhead is... For example, when K=8, it indicates which codebook parameter combination requires 3 bits. The specific indication method can be RRC, MAC CE, or DCI.

[0363] Table 9: Specific codebook parameter combinations for the uplink.

[0364] Secondly, p in Table 9 above υ The number of frequency domain bases used to determine the selected frequency domain bases, based on the Rel-16 eType-II codebook, can be expressed as: Where N3 corresponds to the number of CQI subbands, R represents the number of PMI subbands contained in the CQI subband, and for uplink subband precoding M... υ Since uplink subband precoding does not require CQI feedback, the number of uplink subbands can be determined using the scheme in the first embodiment. Here, we assume the number of uplink subbands is N.s The number of frequency domain bases can then be expressed as:

[0365] Furthermore, while any of the above methods determines the number of selected spatial and frequency domain bases, the specific selection of which spatial and frequency domain bases can be indicated using the methods mentioned in Scheme 2, such as through spatial base indexes, bitmaps, and / or combinations.

[0366] For example, the following is a detailed description of indication methods using bitmaps, combination numbers, and SRS resource indexes. In the bitmap indication method, the base station indicates the status of a specific subband or resource using a bitmap. Each bit represents a subband (or resource), with a value of "1" indicating selection and "0" indicating unselection, allowing precise control over the status of each subband. The combination number indication method indicates the selection of subbands or resources by encoding combinations, significantly reducing the indication bit overhead using a combination number formula. In the SRS resource index indication method, the subband or resource is indicated using an SRS resource index. The base station assigns an SRS resource index to each subband or resource. The base station indicates the SRS resource index via RRC, MAC CE, or DCI signaling. The UE obtains the corresponding resource location based on the received index value.

[0367] Option 4: The number of frequency domain bases and the selected frequency domain base information are indicated separately, and the number M of frequency domain bases is specified based on a predefined method. υ The data set consists of multiple frequency domain bases, and the specific acquisition method is... That is, multiple candidates M υ Through multiple candidate p υ To obtain the data, assume there are Q data items in the dataset, and M... υ The specific values ​​can be obtained through Bits are used to indicate. For example, p υ ∈{1 / 4,1 / 8} or p v If ∈{1 / 4,1 / 2}, then one bit can be used to indicate which p is used. v The value of ; secondly, which spatial bases are specifically selected can be indicated using the same method as Scheme 2, such as through spatial base index, bitmap, and / or combination number.

[0368] The number of frequency domain substrates and the selection of frequency domain substrates can be indicated by MAC CE or DCI; similarly, the number of spatial domain substrates can be indicated by DCI and the selection of spatial domain substrates can be indicated by MAC CE.

[0369] This embodiment proposes a frequency domain basis indication scheme based on the Rel-16 eType-II codebook, covering dynamic indication of the number of frequency domain basis units, joint indication, and selection indication using various methods such as bitmaps, combination numbers, and SRS resource indexes. The scheme not only supports flexible configuration of the frequency domain basis units but also further optimizes the bit overhead of the indication information. Through signaling mechanisms such as MAC CE or DCI, the selection information of the frequency and spatial basis units can be efficiently transmitted, ensuring the accuracy and efficiency of uplink subband precoding. The scheme improves the flexibility and efficiency of frequency domain basis indication while reducing indication overhead, adapting to complex channel conditions and diverse scenario requirements.

[0370] Seventh embodiment: Indication of FeType-II codebook-spatial basis based on Rel-17.

[0371] For uplink fully coherent transmissions greater than 2Tx, the design of uplink subband precoding can refer to the codebook design of NR downlink Rel-17 FeType-II. The codebook architecture still adopts the three-level codebook structure of Rel-17 eType-II. in Represents the spatial basis matrix. These are the projection coefficients obtained by projecting the precoding matrix onto the basis matrices in the spatial and frequency domains. This is the frequency domain basis matrix, where P is the number of transmit antenna ports, L represents the number of spatial basis vectors selected for a single polarization direction and K1 = 2L, M represents the number of selected frequency domain basis vectors, and N... s This indicates the number of subbands in the precoding.

[0372] Based on the above codebook structure, for NR downlink precoding, the user equipment (UE) will report the corresponding PMI information based on the parameters configured on the network side, including the selected antenna port number indication, frequency domain basis indication, and the number of non-zero coefficients obtained based on the selected antenna port number and / or frequency domain basis. The network side transmits the selected antenna port number to the UE via an RRC indication.

[0373] For uplink subband precoding, if a three-level codebook structure based on Rel-17 FeType-II is adopted, and the precoding and frequency domain basis set of the SRS signal are similar to those of Rel-17 FeType-IICSI-RS, using a DFT basis, then it is also necessary to determine the number of antenna ports and / or the number of frequency domain basis sets selected, as well as which antenna ports and frequency domain basis sets are specifically selected. The specific indication method can adopt at least one of the following schemes:

[0374] Option 1: The number of antenna ports is dynamically indicated by the network side, and the number of antenna ports and which antenna ports are selected are jointly indicated. For example, the number of antenna ports in a single polarization direction is P / 2, and the number of selected antenna ports is L. The number of antenna ports and the selection are shared by polarization. The specific indication overhead for different values ​​of P / 2 and L can be found in Table 10.

[0375] Table 10: Specific codebook parameter combinations for the uplink.

[0376] The APCI field is used to indicate the selection of the antenna port. This indicates selecting l antenna ports from P / 2 antenna ports. For different values ​​of L, the required bit indication overhead is... When P / 2 = 4, the corresponding table for L values ​​L∈{1,2,...,P / 2} can be found in Table 11.

[0377] Table 11: When P / 2 = 4, the value of L is L∈{1,2,...,P / 2}.

[0378] As shown in Table 11 above, when L=1, the indication overhead of the SDBI field is 2 bits; when L=2, the indication overhead of the SDBI field is 4 bits; when L=3 or 4, the indication overhead of the SDBI field is 4 bits. Note that Table 11 may only contain a portion of the data. For example, when P / 2=4, the maximum value of L can only be 2. Furthermore, the dynamic indication method can be MAC CE, DCI, or a combination of both.

[0379] The above considerations regarding the selection of spatial substrates assume a shared polarization approach. However, the selection of spatial substrates can also be polarization-specific. In the case of polarization-specific substrates, different polarization directions may correspond to different numbers of spatial substrates, meaning that the value of L may differ for different polarization directions, or the value of L may be the same. Different spatial substrates may be selected for different polarization directions. Shared polarization indicates that different polarization directions use the same selection or method. Polarization-specific indicates that different polarization directions use different selections or methods. Furthermore, if the user equipment uses non-polarized antennas, the number of user equipment antennas can be the total number of antennas actually deployed.

[0380] Option 2: The number of antenna ports and the selected antenna port information are indicated separately. The network side indicates that the number of selected antenna ports is L, and the indicated bit overhead is... Furthermore, L is polarization-shared, meaning that the same number of antenna ports L is selected for both polarization directions. Simultaneously, the network side also needs to indicate which L antenna ports are selected. For example, if the number of antenna ports for a single polarization direction is P / 2, and the number of selected antenna ports is L, once the number of antenna ports is determined, it is necessary to determine which specific antenna ports are selected. This can be indicated using antenna port indices, bitmaps, and / or combinations, with specific indication overheads as follows. P / 2, or Bit.

[0381] For example, the following is a detailed description of indication methods using bitmaps, combination numbers, and SRS resource indexes. In the bitmap indication method, the base station indicates the status of a specific subband or resource using a bitmap. Each bit represents a subband (or resource), with a value of "1" indicating selection and "0" indicating unselection, allowing precise control over the status of each subband. The combination number indication method indicates the selection of subbands or resources by encoding combinations, significantly reducing the indication bit overhead using a combination number formula. In the SRS resource index indication method, the subband or resource is indicated using an SRS resource index. The base station assigns an SRS resource index to each subband or resource. The base station indicates the SRS resource index via RRC, MAC CE, or DCI signaling. The UE obtains the corresponding resource location based on the received index value.

[0382] The number of antenna ports and the selection of antenna ports can be indicated by MAC CE or DCI. Alternatively, the number of antenna ports can be indicated by DCI, and the selection of antenna ports can be indicated by MAC CE.

[0383] Furthermore, for any of the above schemes, the network side can also indicate the maximum number of antenna ports L via RRC, MAC CE, or DCI. max Then the network side passes Bits are used to indicate the number of antenna ports selected, where L max This indicates the maximum number of antenna ports selected by the network side when the number of antenna ports in a single polarization direction configured on the network side is P / 2.

[0384] In addition, it includes an indication of the number of frequency domain bases, and the specific indication method can be combined with N.

[0385] Option 3: Reuse the codebook parameter combination list of Rel-17 FeType-II, such as Table 5.2.2.2.7-1 in 3GPP standard 38.214. Considering that the number of uplink antenna ports is relatively smaller than downlink, a smaller value for β can be introduced to control the overhead of uplink subband precoding indication. For specific uplink codebook parameter combinations, at least one row from Table 12 below can be used. Here, it is assumed that the total number of codebook parameter combinations is K, then the network-side indication overhead is... For example, when K=8, it indicates which codebook parameter combination requires 3 bits. The specific indication method can be RRC, MAC CE, or DCI.

[0386] Table 12: Specific codebook parameter combinations for the uplink.

[0387] Secondly, α in the table above is used to determine the number of antenna ports selected. The number of antenna ports based on the Rel-17 FeType-II codebook can be expressed as: The number of uplink subbands can be determined by referring to the scheme in the first embodiment. Here, it is assumed that the number of uplink subbands is N. s .

[0388] Furthermore, any of the above methods determines the number of selected antenna ports and frequency domain substrates, but the specific selection of which antenna ports to use can be indicated in the manner mentioned in Scheme 2, such as antenna port indexes, bitmaps, and / or combination numbers.

[0389] For example, the following is a detailed description of indication methods using bitmaps, combination numbers, and SRS resource indexes. In the bitmap indication method, the base station indicates the status of a specific subband or resource using a bitmap. Each bit represents a subband (or resource), with a value of "1" indicating selection and "0" indicating unselection, allowing precise control over the status of each subband. The combination number indication method indicates the selection of subbands or resources by encoding combinations, significantly reducing the indication bit overhead using a combination number formula. In the SRS resource index indication method, the subband or resource is indicated using an SRS resource index. The base station assigns an SRS resource index to each subband or resource. The base station indicates the SRS resource index via RRC, MAC CE, or DCI signaling. The UE obtains the corresponding resource location based on the received index value.

[0390] Option 4: The number of antenna ports and the selected antenna port information are indicated separately. Based on a predefined method, the number of antenna ports L is defined as a data set consisting of multiple antenna port numbers. Assuming the data set contains Q data points, the specific value of L can be determined through... The indication is done using bits. For example, if L∈{1,2,4,6,8,12}, then L can be indicated using 3 bits. Secondly, the specific antenna ports selected can be indicated using the same method as in Scheme 2, that is, through antenna port indices, bitmaps, and / or combinations.

[0391] The number of antenna ports and the selection of antenna ports can be indicated by MAC CE or DCI. Alternatively, the number of antenna ports can be indicated by DCI, and the selection of antenna ports can be indicated by MAC CE.

[0392] Furthermore, for any of the above schemes, the network side can also indicate the maximum number of antenna ports L via RRC, MAC CE, or DCI. max Then the network side passes Bits are used to indicate the number of antenna ports selected, where L max This represents the maximum number of antenna ports selected by the network side when the number of antenna ports with a single polarization direction configured is N1N2, while G represents the number of candidate values ​​for L that are less than L. max The number of candidate values. For example, L max =4, L∈{1,2,4,6,8,12}, then the value of G is 3, so only 2 bits are needed to indicate the value of L.

[0393] Option 5: The number of antenna ports and the selected antenna port information are indicated separately, with the number of selected antenna ports specified based on a predefined method. Where α is the antenna port selection coefficient α∈{1 / 8,1 / 4,3 / 8,1 / 2,3 / 4,1}, K1=2L, P represents the sum of the number of antenna ports in two polarization directions, and the number of antenna ports in a single polarization direction is P / 2, and the selection of the number of antenna ports is shared by polarization. The number of antenna ports can then be determined by indicating the value of α. For example, if α contains X candidate values, and these X candidate values ​​are {1 / 2,3 / 4,1}, then it can be determined by... The number of antenna ports can be indicated by a single bit. Alternatively, as mentioned in Scheme 2, the specific selected antenna ports can be indicated by antenna port index, bitmap, and / or combination number.

[0394] For example, in a communication system, the specific antenna port selected can be indicated in three ways: antenna port index, bitmap, and / or combination number. These methods are described in detail below:

[0395] Antenna port indexing is a direct indication method used to identify the specific selected antenna port number. For example, if a user equipment supports multiple antenna ports, the network side can directly indicate the selected antenna port set using an index value (such as 0, 1, 2, or 3). This method is simple and intuitive, and suitable for use in scenarios with a small number of antenna ports.

[0396] Bitmap format uses binary bit values ​​(0 or 1) to indicate the selection status of each antenna port. For example, assuming a user equipment has 8 antenna ports, an 8-bit bitmap can be used to represent the selected ports, where each bit corresponds to one antenna port, with a value of 1 indicating selection and a value of 0 indicating no selection. Bitmap 10110001 can represent that antenna ports 0, 4, 5, and 7 are selected. Bitmap format is suitable for scenarios with a large number of antenna ports but a low selection rate, as it can clearly indicate the status of each antenna port.

[0397] Combinatorial numbers indicate the specific set of antenna ports to be selected through mathematical combinations. Assuming there are N available antenna ports and K antenna ports need to be selected, a combination index can be used to indicate the specific combination to be selected. For example, for N=4 and K=2, the combination numbers might be: Combination Index 0: Antenna Port {0,1}, Combination Index 1: Antenna Port {0,2}, Combination Index 2: Antenna Port {0,3}, Combination Index 3: Antenna Port {1,2}. By sending the combination index value, information can be transmitted, and this method is suitable for scenarios with a large number of antenna ports but requiring the selection of a specific number of ports.

[0398] The three methods described above can be used individually or in combination to suit different scenarios. For example, index indicators can be used when the number of antenna ports is small, while bitmap and / or combination number methods can be preferred when the number is large. The specific choice depends on the network configuration, equipment capabilities, and signaling design requirements.

[0399] The antenna port selection factor α and the antenna port selection can be indicated by MAC CE or DCI. Alternatively, the number of antenna ports can be indicated by DCI, while the selection of antenna ports can be indicated by MAC CE.

[0400] Furthermore, for any of the above schemes, the network side can also indicate the maximum value of α through RRC, MAC CE, or DCI. max Alternatively, the maximum value of α can be determined through a predefined method, for example, α = 1, and then the network side can... Bits are used to indicate the number of antenna ports selected, where α max Let α represent the maximum antenna port selection factor, and A represent the value of α that is not greater than α in the candidate list. maxThe number of candidate values. For example, α max =1, α∈{1 / 2,3 / 4,1}, then the value of A is 3, so only 2 bits are needed to indicate the value of α.

[0401] Option 6: To reduce the indication overhead of user equipment, all antenna ports can be predefined to be selected, and the number of antenna ports on the user equipment side is determined by the configuration of SRS resources, with each SRS resource corresponding to one antenna port; or the selection coefficient α of the antenna ports can be predefined to be 1, that is, all antenna ports are selected.

[0402] This embodiment, based on the Rel-17 FeType-II codebook design, proposes several flexible uplink subband precoding spatial basis indication schemes. The schemes cover dynamic indication of the number and selection of antenna ports, multiple indication methods (index, bitmap, combination number), and joint indication of frequency domain basis-related information to adapt to different channel conditions and network requirements. Furthermore, it provides predefined selection schemes to reduce user equipment indication overhead, improving the efficiency and adaptability of uplink subband precoding. The schemes significantly improve the flexibility and efficiency of uplink subband precoding while reducing indication signaling overhead, providing robust support for transmission under complex channel conditions.

[0403] Eighth embodiment: Indication of FeType-II codebook-frequency domain basis based on Rel-17.

[0404] Based on the seventh embodiment, when the design of uplink subband precoding is based on the Rel-17 FeType-II codebook, in addition to the spatial basis selection indication mentioned in the seventh embodiment, the network side also needs to indicate some information related to the frequency basis of the user equipment, including the frequency basis selection window, the number of frequency basis, and at least one of the specific selected frequency basis.

[0405] The number of frequency domain bases can be determined by reusing the Rel-17 FeType-II port to select the number of frequency domain bases in the codebook, assumed to be M. M can be 1 or 2. The selection of frequency domain bases is performed within a window of length N, which can be 2 or 4. For M=1, no selection of frequency domain bases is required. For M=2, N can be 2 or 4. Therefore, the possible values ​​of M and N include the following cases: M=1; M=2, N=2; M=2, N=4. For each of these three cases, at least one of the following schemes can be used for indication:

[0406] Option 1: Joint indication of the number of frequency domain substrates, the indication of the frequency domain substrates, and the length of the candidate windows of the frequency domain substrates; the specific indication overhead is shown in Table 13: the allocation of indication bits is dynamically adjusted according to different combinations of M and N to reduce indication overhead and improve transmission efficiency. This option, through joint indication, can flexibly adapt to different frequency domain substrate selection configurations, while reducing signaling burden and improving uplink precoding efficiency.

[0407] Table 13: Number of frequency domain substrates and their indications.

[0408] When M=1 and M=2, N=2, since it is not necessary to indicate which frequency domain bases were selected, it can be distinguished by 1 bit. For example, 0 indicates M=1, and 1 indicates M=2, N=2. When M=2, N=4, the existing NR Rel-17 FeType-II design has three states, so it can be indicated by 2 bits.

[0409] Option 2: Indicate the number of frequency domain bases, i.e., the value of M, through RRC, MAC CE, or DCI. When M=2, the value of N and the selected frequency domain bases are indicated by a 2-bit joint. Specific indication methods can be implemented using RRC, MAC CE, or DCI, with corresponding bit overheads shown in Table 14.

[0410] Table 14: Number of frequency domain substrates and their indications.

[0411] Based on Table 14 above, when 2 bits are 00, it means M=2, N=2; when 2 bits are 01, it means the frequency domain base index selected when M=2, N=4 is {0,1}; similarly, when 2 bits are 10 and 11, it means the frequency domain base indices selected when M=2, N=4 are {0,2} and {0,3}, respectively.

[0412] It is important to note that if M=1, the network side only needs to indicate the value of M, that is, the value of N does not need to be indicated.

[0413] Option 3: Indicate the values ​​of M and N through RRC, MAC CE, or DCI. Then, when M=2 and N=4, indicate which two frequency domain bases were selected through 2 bits, as shown in Table 15 below.

[0414] Table 15: Number of frequency domain substrates and their indication.

[0415] Based on Table 15 above, when 2 bits are 00, the selected frequency domain base index is {0,1}; similarly, when 2 bits are 10 and 11, the selected frequency domain base indices are {0,2} and {0,3}, respectively.

[0416] Option 4: Indicate the value of N through RRC, MAC CE, or DCI. Then, when N takes different values, indicate the value of M and the selected frequency domain basis in the manner shown in Table 16 below. The specific indication method can be RRC, MAC CE, or DCI.

[0417] Table 16: Number of frequency domain substrates and their indication.

[0418] Based on Table 16 above, when N=2, M=1 and M=2 can be distinguished by 1 bit; when N=4, M=1 and M=2 can be distinguished by 2 bits, and the specific frequency domain bases selected when M=2 are also indicated. For example, when 2 bits are 00, the selected frequency domain base index is {0,1}; similarly, when 2 bits are 10 and 11, the selected frequency domain base indices are {0,2} and {0,3}, respectively. It should be noted that when N=4, the corresponding 2-bit indication of the value of M and the specific value of the selected frequency domain base can take multiple forms. The embodiments of this application will not list them in detail, and the above examples indicate one possibility.

[0419] Option 5: Indicate the value of N and / or M via RRC, MAC CE, or DCI. Then, once the values ​​of M and N are determined, further indicate which frequency domain substrates were selected. This indication of frequency domain substrate selection is optional; it is only necessary when M = 2 and N = 4. For example, similar to the Rel-17 FeType-II codebook, a 2-bit indication can be used to specify which two frequency domain substrates were selected when M = 2 and N = 4.

[0420] The eighth embodiment, based on the Rel-17 FeType-II codebook, proposes several flexible frequency domain basis indication schemes. By dynamically configuring the number of frequency domain bases and the selection window, and combining multiple indication methods (such as RRC, MAC CE, and DCI joint indication), it adapts to different network requirements. Each scheme effectively balances indication overhead and flexibility, supporting the efficient implementation of uplink subband precoding. The proposed scheme significantly reduces signaling overhead and improves the flexibility of frequency domain base selection through joint indication, adapting to uplink transmission requirements under complex channel conditions and improving system efficiency.

[0421] Ninth embodiment: Two-level DCI indication content based on Rel-16 eType-II codebook.

[0422] In some examples, the uplink subband precoding is obtained based on the Rel-16 eType-II codebook, and the uplink subband precoding is indicated through a two-level DCI. In some examples, the indication content of the uplink subband precoding adopts at least one of the following methods: the indication information of the uplink subband precoding is divided into two parts, wherein the first part is carried in the first-level DCI and the second part is carried in the second-level DCI, and the bit overhead of the second part is determined based on the first part; the indication information of the uplink subband precoding is divided into two parts, wherein the first part is carried in the first-level DCI and the second part is carried in the second-level DCI, wherein at least the recovery of the subband precoding is completed based on the first part; and / or the indication information of the uplink subband precoding is divided into two parts, and both parts are carried in the second-level DCI indication information, while the first-level DCI carries the time-frequency domain location information of the second-level DCI.

[0423] In some examples, the bit overhead of the indication information for the subband precoding granularity is determined according to at least one of the following methods: the subband granularity of the uplink subband precoding is indicated by the base station; determined based on the capabilities of the user equipment and / or predefined rules; candidate values ​​for the subband granularity of the uplink subband precoding are determined and indicated by signaling transmitted by the base station; the candidate values ​​for the subband granularity of the uplink subband precoding are configured by Radio Resource Control (RRC) signaling transmitted by the base station, and / or the subband granularity of the uplink subband precoding is indicated by Media Access Control (MAC) CE signaling or DCI transmitted by the base station.

[0424] For example, based on the uplink subband precoding schemes mentioned in the first to seventh embodiments, the signaling overhead for network-side instruction of user equipment is relatively large. Furthermore, the method of blindly detecting the PDCCH within the search space to obtain all scheduling information in the DCI at once suffers from high blind detection complexity, inability to obtain scheduling information before the entire DCI decoding is completed, and significant detection latency. To better instruct user equipment, existing technologies have considered using a two-level DCI for uplink subband precoding instruction. However, in existing technologies, both levels of DCI require blind detection. To avoid incomplete uplink subband precoding information due to missed DCI detections, some common information for uplink precoding recovery needs to be carried in both levels of DCI, which may lead to a waste of downlink resources.

[0425] To address this, embodiments of this application also consider using a two-level DCI to indicate uplink subband precoding. For the second-level DCI, the indication from the first-level DCI can help avoid missed detections, thereby preventing incomplete uplink subband precoding indication information at both levels. Furthermore, embodiments of this application also consider the indication information that may be carried in the two-level DCI to ensure complete recovery of uplink subband precoding.

[0426] Based on the fifth embodiment, this embodiment mainly considers that the uplink subband precoding is obtained based on the Rel-16 eType-II codebook and indicated through a two-level DCI. The specific indication content can adopt at least one of the following schemes:

[0427] Option 1: In some examples, the information carried by the first-level DCI includes at least one of the following: RI indication information, total number of non-zero coefficients, number of spatial bases, indication information of the number and selection of spatial bases, indication information of the selected spatial bases, codebook parameter selection indication information, indication information related to the number of subbands or precoding granularity, number of frequency bases, indication information of the number and selection of frequency bases, indication information of the selected frequency bases, indication information of frequency base coefficient selection, codebook parameter selection indication information, factor indication information of the maximum number of non-zero coefficients, time-frequency domain resource location of the second-level DCI, and / or aggregation level and / or DCI format information corresponding to the second-level DCI. In some examples, the information carried by the second-level DCI includes at least one of the following: bitmap information of non-zero coefficients, position indication information of the largest non-zero coefficient, non-zero coefficient indication information, oversampling basis selection indication, RI indication information, total number of non-zero coefficients, spatial basis number information, spatial basis number and selection indication information, selected spatial basis indication information, codebook parameter selection indication information, subband number related indication information or precoding granularity related indication information, frequency basis number information, frequency basis number and selection indication information, selected frequency basis indication information, frequency basis coefficient selection indication information, codebook parameter selection indication information, and / or factor indication information of the largest non-zero coefficient number.

[0428] For example, the uplink subband precoding indication information can be divided into two parts, where the first part is carried in the first-level DCI and the second part is carried in the second-level DCI. Based on the information in the first part, the bit overhead of the second part can be determined. The information carried by the first-level DCI may include at least one of the following: RI (Rank Indicator) indication information; total number of non-zero coefficients; spatial basis number information in the fifth embodiment; indication information of the number and selection of spatial basis in the fifth embodiment; indication information of the selected spatial basis in the fifth embodiment; codebook parameter selection indication information in the fifth embodiment; subband number-related indication information or precoding granularity-related indication information in the first embodiment; frequency basis number information in the sixth embodiment; frequency basis number and selection indication information in the sixth embodiment; indication information of the selected frequency basis in the sixth embodiment; frequency basis coefficient selection indication information in the sixth embodiment; codebook parameter selection indication information in the sixth embodiment; factor indication information of the maximum number of non-zero coefficients; time-frequency domain resource location of the second-level DCI; aggregation level and DCI format information corresponding to the second-level DCI, etc.

[0429] The second-level DCI can be designed as a new type of DCI. The information carried in the second-level DCI may include at least one of the following: bitmap information of non-zero coefficients, position indication information of the largest non-zero coefficient, non-zero coefficient indication information, and oversampling basis selection indication. Additionally, it may include at least one of the following: RI indication information; total number of non-zero coefficients; information in the fifth embodiment: spatial basis number information, spatial basis number and selection indication information, selected spatial basis indication information, codebook parameter selection indication information; information in the first embodiment: sub-band number-related indication information or precoding granularity-related indication information; information in the sixth embodiment: frequency domain basis number information, frequency domain basis number and selection indication information, selected frequency domain basis indication information, frequency domain basis coefficient selection indication information, codebook parameter selection indication information; and factor indication information of the largest non-zero coefficient number. By carrying the above information in the second-level DCI, more accurate indication of uplink sub-band precoding can be achieved, ensuring the integrity and effectiveness of the encoded information, while improving transmission performance and resource utilization efficiency.

[0430] This scheme effectively reduces the bit overhead of a single DCI by distributing precoding indication information to two levels of DCI, and ensures that the indication information of the two levels of DCI is complete and reliable by guiding the second level of DCI through the first level of DCI, thereby improving the performance and robustness of uplink subband precoding.

[0431] Option 2: The uplink subband precoding indication information can be divided into two parts. The first part is carried in the first-level DCI, and the second part is carried in the second-level DCI. Based on the first part, at least a preliminary recovery of the subband precoding can be completed, while the second part can be considered a further supplement to the first part. By combining the two parts, more accurate uplink subband precoding information can be recovered. The first part may contain at least one of the following: non-zero coefficients of the channel or precoding matrix in the projection coefficients of at least one spatial basis and at least one frequency basis. For example, the first part may contain the largest non-zero coefficient of the channel or precoding matrix in the projection coefficients of at least one spatial basis and the first frequency basis. In addition, the first part may also contain other information used to recover the subband precoding, such as spatial and / or frequency basis selection indications, the location indication of the largest non-zero coefficient, and RI indications.

[0432] The second part of the information includes indications of spatial or frequency domain bases not covered in the first part, as well as indications of non-zero coefficients in the projection coefficients on the spatial and frequency domain bases. The second part may also include indications of the position and number of non-zero coefficients. Combined with the information in the first part, this allows for a more complete recovery of the subband precoding.

[0433] For example, based on the existing Rel-16 eType-II codebook's reporting priority allocation rules, CSI part2 is divided into three parts: Group 0, Group 1, and Group 2. For uplink subband precoding, if the Rel-16 eType-II codebook scheme is used, similar content to CSI part2 may exist. The reporting priorities of coefficients in W2 can be allocated according to the priority allocation rules specified in section 5.2.3 of 3GPP 38.214, and then the corresponding coefficients can be assigned to Group 1 and Group 2. The content of Group 0 and Group 1 can be placed in the first-level DCI, while the content of Group 2 can be placed in the second-level DCI. Group 0 contains other necessary information besides non-zero coefficients, such as at least one of the following: Fifth embodiment: spatial basis number information, spatial basis number and selection indication information, selected spatial basis indication information, codebook parameter selection indication information; First embodiment: sub-band number related indication information or precoding granularity related indication information; Sixth embodiment: frequency domain basis number information, frequency domain basis number and selection indication information, selected frequency domain basis indication information, frequency domain basis coefficient selection indication information, codebook parameter selection indication information; factor indication information of the maximum number of non-zero coefficients.

[0434] This two-level DCI design effectively reduces the indication overhead of a single DCI while ensuring accurate recovery of uplink subband precoding, thereby improving system performance and resource utilization efficiency.

[0435] Option 3: The uplink subband precoding indication information can be divided into two parts, both of which are carried in the second-level DCI. The first-level DCI mainly indicates the time-frequency domain location of the second-level DCI, including information such as the time-frequency domain location of the second-level DCI and the aggregation level corresponding to the second-level DCI. This better supports the decoding of the second-level DCI, reduces the complexity of blind detection of the second-level DCI, and may even avoid blind detection of the second-level DCI altogether. Simultaneously, all relevant information of the uplink subband precoding is placed in the second-level DCI, which can be split into two parts. Specifically, the content carried by these two parts can refer to the information carried by the two-level DCI in Option 1 of this embodiment. The content carried by the first-level DCI in Option 1 corresponds to the first part of the second-level DCI here, and the content carried by the second-level DCI in Option 1 corresponds to the second part of the second-level DCI here. This design effectively reduces the complexity of the first-level DCI while ensuring the integrity and accuracy of the uplink subband precoding indication information, further optimizing system performance and resource utilization efficiency.

[0436] For the implementation of two-level DCI, based on existing technology, there may be two approaches: one is that the two DCIs reside in one PDCCH, and the other is that the second-level DCI resides within the PUSCH scheduled by the first-level DCI. For the first approach, the time-frequency domain positions of the two DCIs can be indicated using at least one of the following methods:

[0437] Method 1: Configure two CORESETs within a search space. The starting time domain of each CORESET is configured through the `monitoringSymbolsWithinSlot` field under the search space. The `monitoringSymbolsWithinSlot` field has two bits set to 1, representing the starting symbol positions of the two CORESETs. Additionally, the corresponding DCI duration symbol length is configured under each CORESET.

[0438] Method 2: Two DCIs correspond to one search space, but share one CORESET configuration. The starting time domain of each CORESET is configured through the monitoringSymbolsWithinSlot field under the search space. The monitoringSymbolsWithinSlot field is configured with two bits set to 1, which respectively represent the starting symbol positions of the two CORESETs.

[0439] Method 3: Two DCIs correspond to one search space, but share a single CORESET configuration. The starting time domain of the first CORESET is configured through the `monitoringSymbolsWithinSlot` field under the search space. A bit value of 1 in the `monitoringSymbolsWithinSlot` field indicates the starting symbol position of the CORESET. Simultaneously, the starting symbol position of the CORESET corresponding to the second-level DCI is indicated in the first-level DCI.

[0440] Method 4: Configure two CORESETs within a search space. The starting time domain of the first CORESET is configured through the `monitoringSymbolsWithinSlot` field under the search space. A bit value of 1 in the `monitoringSymbolsWithinSlot` field indicates the starting symbol position of the first CORESET. The first-level DCI indicates the starting symbol position of the CORESET corresponding to the second-level DCI. Furthermore, the corresponding DCI duration symbol length is configured under each CORESET.

[0441] To improve blind detection and decoding of Level 2 DCI, the aggregation level of Level 2 DCI can be indicated in Level 1 DCI, or implemented through at least one of the following methods: predefining or indicating the minimum aggregation level that Level 2 DCI might use; configuring candidate aggregation levels for Level 2 DCI via RRC signaling, and then indicating them through Level 1 DCI. Furthermore, a new RNTI type, such as TS-RNTI, can be introduced. When the user equipment detects TS-RNTI, it knows that Level 2 DCI exists. Alternatively, the existence of Level 2 DCI can be determined based on the indication field in Level 1 DCI. For example, in the aforementioned Level 1 DCI, the starting symbol position corresponding to Level 2 DCI would be configured.

[0442] By using at least one of the above methods, the blind detection complexity of the second-level DCI can be effectively reduced, the decoding efficiency can be improved, and the integrity of the indication information can be ensured.

[0443] The ninth embodiment proposes a two-level DCI indication scheme based on the Rel-16 eType-II codebook. This scheme flexibly allocates precoded indication information to the first and second level DCIs, while innovative indication and blind detection designs reduce signaling overhead and decoding complexity, thus optimizing system performance. Multiple CORESET and DCI configuration methods are provided for different scenarios to ensure the integrity and efficiency of the indication information. The flexible two-level DCI design effectively reduces blind detection complexity and signaling overhead, improving the accuracy and resource utilization efficiency of uplink subband precoded indications.

[0444] Tenth embodiment: Two-level DCI indication content based on Rel-17 FeType-II codebook.

[0445] In some examples, the subband precoding indication information is carried through a two-level DCI. In some examples, the first-level DCI includes at least one of the following: MCS indication information, the number of maximum non-zero coefficients, the number and selection of antenna ports jointly indicated, the number of frequency domain substrates, the frequency domain substrate selection and window length jointly indicated, codebook parameter combination information, non-zero coefficient selection factor indication information, subband precoding granularity indication information, and in multi-panel scenarios, the number of spatial domain substrates and spatial domain substrate selection jointly indicated for the second panel, the number of frequency domain substrates and frequency domain substrate selection jointly indicated, codebook parameter combination information, non-zero coefficient selection factor indication information, part or all of the subband precoding granularity indication information, and / or the time-frequency domain resource information corresponding to the second-level DCI. In some examples, the second-level DCI includes at least one of the following: the position indication information of the maximum non-zero coefficients, the bitmap indication information of non-zero coefficients, the amplitude and phase indication information of non-zero coefficients, and / or the oversampling substrate indication information. In some examples, the bit overhead of the indication information for the subband precoding granularity is determined according to at least one of the following methods: the subband granularity of the uplink subband precoding is indicated by the base station; determined based on the capabilities of the user equipment and / or predefined rules; candidate values ​​for the subband granularity of the uplink subband precoding are determined and indicated by signaling transmitted by the base station; the candidate values ​​for the subband granularity of the uplink subband precoding are configured by Radio Resource Control (RRC) signaling transmitted by the base station, and / or the subband granularity of the uplink subband precoding is indicated by Media Access Control (MAC) CE signaling or DCI transmitted by the base station.

[0446] Therefore, based on the seventh embodiment, this embodiment mainly considers that the uplink subband precoding is obtained based on the Rel-17 FeType-II codebook, and the uplink subband precoding is indicated through a two-level DCI. The specific indication content can adopt at least one of the following schemes:

[0447] Option 1: The uplink subband precoding indication information can be divided into two parts. The first part is carried in the first-level DCI, and the second part is carried in the second-level DCI. Based on the information in the first part, the bit overhead of the second part can be determined.

[0448] The information carried by the first-level DCI includes at least one of the following: RI indication information; total number of non-zero coefficients; number of antenna ports in the seventh embodiment; indication information of the number and selection of antenna ports in the seventh embodiment; indication information of the selected antenna ports in the seventh embodiment; codebook parameter selection indication information in the seventh embodiment; antenna port coefficient selection indication information in the seventh embodiment; joint indication information of the number of frequency domain substrates, the indication of frequency domain substrates, and the length of the candidate window of the frequency domain substrates in the eighth embodiment; multiple values ​​of M and N mentioned in the eighth embodiment, and joint indication information of the selection of M; indication information of the number of frequency domain substrates M, the indication information of the selection window length N of the frequency domain substrates, and the indication information of the selection of frequency domain substrates mentioned in the eighth embodiment; relevant indication information for determining the number of sub-bands in the first embodiment; factor indication information of the maximum number of non-zero coefficients; the time-frequency domain resource location of the second-level DCI, and the aggregation level and DCI format corresponding to the second-level DCI.

[0449] For the second-level DCI, it can be designed as a new type of DCI. The information carried in the second-level DCI may include at least one of the following: bitmap information of non-zero coefficients, position indication information of the largest non-zero coefficient, and non-zero coefficient indication information. In addition, it may also include at least one of the following: antenna port number information in the seventh embodiment; antenna port number and selection indication information in the seventh embodiment; selection antenna port indication information in the seventh embodiment; codebook parameter selection indication information in the seventh embodiment; antenna port coefficient selection indication information in the seventh embodiment; joint indication information of the number of frequency domain substrates, frequency domain substrate indication, and frequency domain substrate candidate window length in the eighth embodiment; multiple values ​​of M and N given in the eighth embodiment, and joint indication information of the selection of M; indication information of the number of frequency domain substrates M, frequency domain substrate selection window length N, and frequency domain substrate selection mentioned in the eighth embodiment; relevant indication information used to determine the number of sub-bands in the first embodiment; factor indication information of the number of the largest non-zero coefficient. The above instructions ensure that the information carried by the second-level DCI is rich and complete, providing effective support for the implementation of uplink subband precoding.

[0450] Option 2: The uplink subband precoding indication information can be divided into two parts. The first part is carried in the first-level DCI, and the second part is carried in the second-level DCI. Based on the information in the first part, at least the subband precoding can be recovered. The second part can be regarded as a further supplement to the first part. By combining the two parts of information, more accurate uplink subband precoding information can be recovered.

[0451] The information in the first part may include at least one non-zero coefficient among the projection coefficients of the channel or precoding matrix at at least one antenna port and at least one frequency domain basis. For example, the first part may include a non-zero coefficient among the projection coefficients of the channel or precoding matrix at at least one antenna port and a first frequency domain basis, which may be the largest non-zero coefficient. Furthermore, the first part may also include other information used to recover subband precoding, such as antenna port selection indications, indications of the location of the largest non-zero coefficient, and RI indications.

[0452] The second part of the indication information includes indications for antenna ports or frequency domain substrates not covered in the first part, as well as indications for non-zero coefficients obtained from projections onto the antenna ports and frequency domain substrates. It may also include indications of the location and number of some non-zero coefficients. This information, combined with the information received in the first part, can better facilitate the recovery of subband precoding.

[0453] For example, based on the reporting priority allocation rules in the existing Rel-17 FeType-II codebook, CSI part 2 is divided into three parts: Group 0, Group 1, and Group 2. For uplink subband precoding, if the Rel-17 FeType-II codebook scheme is used, it may also involve some content from CSI part 2. Therefore, the reporting of coefficients in W2 can be prioritized according to the priority allocation rules specified in section 5.2.3 of 3GPP 38.214, and the corresponding coefficients can be assigned to Group 1 and Group 2. Specifically, the content of Group 0 and Group 1 is placed in the first-level DCI, while the content of Group 2 is placed in the second-level DCI.

[0454] Group 0 contains essential information other than non-zero coefficients, such as at least one of the following: antenna port number information in the seventh embodiment; antenna port number and selection indication information in the seventh embodiment; selection indication information of antenna ports in the seventh embodiment; codebook parameter selection indication information in the seventh embodiment; antenna port coefficient selection indication information in the seventh embodiment; joint indication information of the number of frequency domain substrates, frequency domain substrate indication, and frequency domain substrate candidate window length in the eighth embodiment; multiple values ​​of M and N given in the eighth embodiment, and joint indication information of M selection; indication information of the number of frequency domain substrates M, frequency domain substrate selection window length N, and frequency domain substrate selection mentioned in the eighth embodiment; relevant indication information for determining the number of subbands in the first embodiment; factor indication information of the maximum number of non-zero coefficients. This hierarchical design effectively reduces the complexity of the first-level DCI while ensuring the completeness and accuracy of the indication information, providing efficient support for the implementation of uplink subband precoding.

[0455] Option 3: The uplink subband precoding indication information can be divided into two parts. The first part is carried in the first-level DCI, and the second part is carried in the second-level DCI. The first part contains at least the indication information corresponding to the L1 layer subband precoding, where L1 ≥ 1, and L1 refers to the previous L1 layer. The second part of the indication information is used to recover the subband precoding indication information corresponding to other layers besides L1. Therefore, in addition to indicating some information common to all layers, such as information related to antenna ports and frequency domain basis indication, the first part also indicates some information specific to the previous L1 layer, such as the bitmap information of the non-zero coefficients corresponding to the previous L1 layer and the indication information of the non-zero coefficients corresponding to the previous L1 layer.

[0456] Option 4: The uplink subband precoding indication information can be divided into two parts, both of which are carried in the second-level DCI. The first-level DCI mainly carries the time-frequency domain location information of the second-level DCI, which is mainly used to determine the time-frequency domain location of the second-level DCI and the aggregation level corresponding to the second-level DCI, thereby better supporting the decoding of the second-level DCI, reducing the complexity of blind detection of the second-level DCI, or avoiding blind detection of the second-level DCI.

[0457] In this scheme, all uplink subband precoding-related information is placed in the second-level DCI, and this information is split into two parts. The specific information carried by the two parts can be referred to the content carried by the two-level DCI in Scheme 1 of this embodiment. The content carried by the first-level DCI in Scheme 1 can correspond to the first part of the second-level DCI in this scheme, and the content carried by the second-level DCI in Scheme 1 can correspond to the second part of the second-level DCI in this scheme.

[0458] Similarly, the implementation method and related content of the two-level DCI mentioned in the ninth embodiment are also applicable to the two-level DCI scheme in this embodiment. This design scheme effectively reduces the complexity of the first-level DCI while ensuring the integrity of the indication information and decoding efficiency, providing more efficient support for the implementation of uplink subband precoding.

[0459] Building upon Scheme 4, a supplementary scheme is proposed where the UE configures SRS antenna ports, and the network side selects all antenna ports by default. The specific description is as follows: During uplink subband precoding, the User Equipment (UE) can determine the antenna port usage based on the SRS resources configured on the network side. The network side assumes by default that all SRS antenna ports are selected and processes all antenna ports without further indicating specific antenna port selection information. This default full-port selection mechanism effectively reduces the overhead of DCI indication information and improves configuration and transmission efficiency.

[0460] The UE configures SRS resources based on the network's RRC signaling, determining the number of supported antenna ports and related attributes. The network defaults to selecting all configured SRS antenna ports, eliminating the need for further instruction on which ports are selected. Based on this default selection mechanism, the UE performs channel measurements on all configured SRS antenna ports and uses the results for uplink subband precoding. The network instructs the UE in the second-level DCI with frequency domain basis information and non-zero coefficients. The UE completes uplink subband precoding based on the received instructions and transmits data via PUSCH. By default selecting all antenna ports, the overhead of additional antenna port selection by the network is avoided. This fully utilizes all configured antenna ports, improving uplink channel coverage and quality. It supports different UE antenna configurations while simplifying the network's configuration logic. This supplementary solution is particularly suitable for high-density antenna deployment scenarios, optimizing uplink transmission performance while maintaining flexibility.

[0461] The tenth embodiment proposes a two-level DCI indication scheme based on the Rel-17 FeType-II codebook. By flexibly dividing the indication information into the first and second level DCIs, it optimizes signaling overhead and decoding complexity, while supporting the flexibility of different antenna and frequency domain substrate configurations. The scheme includes four main designs and a supplementary mechanism that defaults to selecting all antenna ports on the UE side to improve transmission efficiency and configuration flexibility. Through the flexible two-level DCI design and the default full-port selection mechanism, signaling overhead is significantly reduced, configuration logic is simplified, and uplink transmission performance and coverage are improved.

[0462] Eleventh embodiment: Dynamic indication of non-zero coefficient selection factor β.

[0463] In the fifth, sixth, and ninth embodiments, the uplink subband precoding is designed using the Rel-16 eType-II codebook scheme. In this case, the uplink subband precoding information indicated by the network side includes an important piece of information: the projection coefficients of the uplink channel or precoding onto the spatial-frequency domain basis, i.e., the selected non-zero coefficients in the W2 projection coefficient matrix that need to be reported. The number of non-zero coefficients to be reported in W2 is related to the selection factor β of the non-zero coefficients in the codebook parameters. Analogous to the number of the maximum non-zero coefficients in the first layer of the Rel-16 eType-II codebook, it can be expressed as... Furthermore, β is semi-statically configured on the network side via RRC.

[0464] Secondly, in the seventh, eighth, and tenth embodiments, the uplink subband precoding is designed using the Rel-17 FeType-II codebook scheme. Similarly, the number of non-zero coefficients to be reported in W2 is related to the selection factor β of the non-zero coefficients in the codebook parameters. Analogously, the number of the maximum non-zero coefficients in the first layer of the Rel-17 FeType-II codebook can be expressed as... Furthermore, β is semi-statically configured on the network side via RRC. Based on the above two uplink subband codebook design schemes, the control of the number of non-zero coefficients in uplink subband precoding can adopt the same method. However, in this embodiment, the selection factor for the number of non-zero coefficients can be dynamically configured according to the channel conditions, or the number of spatial frequency domain bases can be dynamically adjusted when β is constant. In this regard, this embodiment provides at least one of the following solutions:

[0465] Option 1: The non-zero coefficient selection factor β is dynamically configured by the network side based on channel state information. It is assumed that the value of the non-zero coefficient selection factor β can be at least one of {1 / 16, 1 / 8, 1 / 4, 3 / 8, 1 / 2, 5 / 8, 3 / 4, 1}. The network side can dynamically indicate the value of β to the user equipment via MAC CE or DCI. The specific bit overhead required for this indication can be expressed as follows: Where K represents the number of elements in the candidate set of β values. For example, the number of candidate values ​​for β can be determined as K through network-side configuration or predefined methods. Which of the K candidate values ​​β is can then be indicated by MAC CE or DCI. For example, if β∈{1 / 8,1 / 4,1 / 2,3 / 4}, then K is 4, requiring 2 bits to indicate the specific value of β. The candidate set of β can be determined through network-side indication or predefined methods; for example, the candidate set of β can be configured as β∈{1 / 8,1 / 4,1 / 2,3 / 4} via RRC.

[0466] Option 2: Provide a predefined set of candidate values ​​for β, and configure a maximum β using RRC.max The value of β is determined by the network side, which can configure the actual value of β based on the candidate value set of β, and the configured value cannot be greater than β. max If equal to β max The default configuration can be used; otherwise, the network side will dynamically configure it based on channel state information. For example, β ∈ at least one of {1 / 16, 1 / 8, 1 / 4, 3 / 8, 1 / 2, 5 / 8, 3 / 4, 1}, β max =1, and then the network side can indicate to the user equipment, based on the actual channel conditions, that the actual value of β can be any one of {1 / 16, 1 / 8, 1 / 4, 3 / 8, 1 / 2, 5 / 8, 3 / 4}. The specific indication overhead depends on values ​​less than β. max The number of candidate β values, for example, less than β max If there are K candidate β values, then the required indication overhead is:

[0467] Secondly, in order to control the total instruction overhead, it can be stipulated that the total number of non-zero coefficients does not exceed 2K0.

[0468] Alternatively, the network side can directly report the number of non-zero coefficients based on the magnitude of the projection coefficients, and this number can be different for different layers, so the network side knows the specific projection coefficients.

[0469] The eleventh embodiment proposes a dynamic indication method for the non-zero coefficient selection factor β to optimize the resource allocation of uplink subband precoding. The value of β is dynamically indicated by MAC CE or DCI, or the candidate set and maximum value of β are configured by RRC. Combined with channel state dynamic adjustment, β effectively controls the number of non-zero coefficients in the W_2 matrix. This method is applicable to Rel-16 eType-II and Rel-17 FeType-II codebook designs, improving signaling efficiency and resource utilization. Dynamically adjusting the non-zero coefficient selection factor β allows uplink subband precoding to flexibly adapt to channel conditions, significantly reducing indication overhead and optimizing transmission performance.

[0470] Twelfth Implementation: Reuse rules for dedicated SR and UCI for event-triggered reporting.

[0471] In view of the technical problems mentioned below, some technical solutions of this application can solve at least one of the following technical problems:

[0472] UCI multiplexing rules applicable to dedicated SRs: To improve cell handover performance and reduce handover latency, some embodiments of this application employ cell handover judgment based on L1 measurement events. The measurements include L1-RSRP or L1-SINR, and the events are based on LTM2 to LTM5 events defined in L2 layer. According to existing standards, event-triggered L1 measurement results can be carried via MAC CE and notified to the network side through dedicated SR scheduling messages. However, current SR multiplexing rules with other UCIs may prevent the network side from determining the existence of a dedicated SR. For example, when transmitting UL-SCH on PUSCH, if reporting is based solely on BSR (Buffer Status Report), the network side cannot distinguish whether a dedicated SR is included. Furthermore, when multiple SRs exist in a slot, the terminal can only report a maximum of two SRs; if neither includes a dedicated SR, the network side may still be unable to obtain this information. Therefore, further research is needed on UCI multiplexing rules applicable to dedicated SRs.

[0473] For example, to improve cell handover performance and reduce handover latency, some embodiments of this application consider cell handover judgment based on L1 measurement events. The measurement quantity of the event can be L1-RSRP or L1-SINR information obtained from L1 measurements, and the event is based on LTM2 to LTM5 events defined by L2. According to the current progress of standard discussions, the L1 measurement results triggered by the event can be carried through MAC CE and can be notified to the network side through a dedicated SR scheduling message.

[0474] Since traditional CSI reporting is typically configured and / or triggered by the network side, and in traditional aperiodic or semi-persistent CSI reporting, the starting point of CSI calculation time is usually defined as the end symbol of the slot where the DCI that triggered the CSI reporting is located. Therefore, for event-triggered L1 measurement reporting scenarios that do not require DCI triggering, the traditional definition of the starting position of CSI calculation time is no longer applicable, and a new processing end time needs to be defined.

[0475] To address the aforementioned issues, some embodiments of this application primarily consider the definition of CPU usage time corresponding to event-triggered L1 measurement reporting, and the rules for multiplexing dedicated SRs with other UCIs. Specifically, at least one of the following solutions may be included:

[0476] Option 1: Since the terminal can notify the network side via a dedicated SR message that it has event-triggered L1 measurement results that need to be reported through MAC CE, it can be assumed that the UE has prepared the relevant measurement information before sending the SR message. Based on this, the time occupied by the CSI calculation and processing unit can be defined as any of the following time points: the start symbol of the SR message transmission, the end symbol of the SR message transmission, the first symbol of the slot where the SR message is located, or the last symbol of the slot.

[0477] Option 2: Assuming the dedicated SR message corresponding to the event-triggered L1 measurement report follows the same multiplexing rules as the traditional SR, when the PUCCH and PUSCH time domains overlap and the PUSCH carries the UL-SCH, the SR request is transmitted via a BSR. To ensure this BSR can be used to identify event-triggered measurement report submission requests, a 1-bit identifier can be set in the BSR to indicate whether the BSR is an SR request message that replaces the PUCCH.

[0478] Option 3: If the terminal notifies the network side that it has an event-triggered MAC CE measurement report that needs to be reported, when the PUCCH carrying the SR overlaps with the PUSCH in the time domain, in order to ensure the reporting priority of the dedicated SR and ensure that the network side can perceive the event triggering information in a timely manner, the UE should discard the PUSCH and send the PUCCH carrying the dedicated SR message first, regardless of whether the PUSCH carries UL-SCH.

[0479] Option 4: The current NR standard supports configuring up to 8 SRs for each UE. When the MAC layer triggers multiple SRs in the same time slot, if the PUCCH resources of multiple positive SRs overlap with the PUCCH resources of HARQ / CSI, according to the existing standard, the UE needs to choose one positive SR to reuse with HARQ / CSI. If multiple positive SRs include a dedicated SR, the dedicated SR will be selected first for reuse with HARQ / CSI.

[0480] Option 5: When multiple positive SRs with non-overlapping time-domain resources exist in the same time slot, according to existing standards, the UE can choose up to two to report and discard the rest. If the above SRs include dedicated SRs, then at least one of the two selected SRs should be a dedicated SR.

[0481] Option 6: Similar to Option 5, if multiple positive SRs with non-overlapping time-domain resources exist in the same time slot, and one of them is a dedicated SR, the UE can select up to three positive SRs to report, including at least one dedicated SR. Furthermore, at least one of the three SRs should be carried on a short PUCCH; this SR can be either a dedicated SR or a non-dedicated SR.

[0482] The twelfth embodiment proposes a multiplexing rule for dedicated scheduling requests (SRs) and uplink control information (UCIs) applicable to event-triggered L1 measurement reporting scenarios. To address the issue of the network side's inability to reliably identify dedicated SRs under existing protocols, this embodiment, without relying on DCI triggering, combines the MAC CE bearer mechanism and proposes optional solutions from multiple dimensions, including CPU occupancy time definition, SR transmission location, BSR replacement indication mechanism, PUCCH and PUSCH conflict handling strategy, and positive SR priority selection rule. This ensures efficient reporting of event-triggered measurement information, timely allocation of scheduling resources, and minimization of cell handover latency. This embodiment optimizes the SR and UCI multiplexing rule through multiple solutions, achieving efficient transmission of event-triggered measurement information, improving cell handover performance, and enhancing system scheduling flexibility. It should be understood that any example solution described in this embodiment can be implemented alone or in combination with other example solutions in this embodiment; furthermore, it can be implemented in conjunction with at least one technical feature of other embodiments in this application. For those skilled in the art, substitutions, adjustments, or combinations of these solutions are all within the scope of protection of this application.

[0483] Thirteenth embodiment: Mapping rules for beam information of event reporting or the format of MAC CE.

[0484] In view of the technical problems mentioned below, some technical solutions of this application can solve at least one of the following technical problems:

[0485] The mapping rules for terminal reporting content are standardized as follows: Based on existing standards, event-triggered L1 measurement reporting can be carried through a MAC CE, which can be a truncated MAC CE. This MAC CE can carry the reported configuration ID, event configuration ID, at least one beam ID (such as SSBRI or CRI) that triggered the event, and its corresponding L1-RSRP value. The network side can configure the terminal to report up to N beams and can set whether beams that have not triggered events are allowed to be reported together in the MAC CE. The LTM event types defined in the current standard include: LTM2: The serving cell's beam quality is below an absolute threshold; LTM3: The candidate cell's beam quality is better than the serving cell by a certain offset; LTM4: The candidate cell's beam quality is better than an absolute threshold; LTM5: The serving cell's beam quality is below threshold 1, and the candidate cell's beam quality is better than another threshold 2. Currently, normal MAC CEs and truncated MAC CEs use the same format for different LTM events. To ensure that the network can still make effective handover decisions based on the reported content when MAC CE is truncated, the mapping rules of the terminal in the reported content need to be further standardized.

[0486] For example, based on existing standards, event-triggered L1 measurement reporting is conducted via a MAC CE, and a truncated MAC CE can be used. The truncated MAC CE can carry the reported Config ID or event Config ID, as well as at least one Beam ID (SSBRI or CRI) of the triggering event and the corresponding L1 RSRP. Simultaneously, the network side can configure a maximum of N beams to be reported, and can configure whether beams without triggered events are reported in the MAC CE. The four types of events currently defined in the standard are as follows:

[0487] - Event LTM2: The serving cell’s beam becomes worse than the absolute threshold.

[0488] - Event LTM3: The beam of the candidate cell becomes better than the beam of the serving cell by a certain offset.

[0489] - Event LTM4: The beam of the candidate cell becomes better than the absolute threshold.

[0490] Event LTM5: The serving cell’s beam becomes worse than absolute threshold 1, and the candidate cell’s beam becomes better than another absolute threshold 2.

[0491] Therefore, the mapping rules for the content carried in normal MAC CE and truncated MAC CE for different LTM events need further discussion. In this regard, this embodiment provides at least one of the following solutions:

[0492] Option 1: The network side is configured to report a maximum of N beams, and the terminal only reports information about the beam that triggered the event. Therefore, for event LTM2, the terminal only reports information about one beam that satisfies the event; for event LTM3, the terminal may report the beam information of the candidate cells that satisfy the event, as well as the beam information of the current serving cell, or only the beam information of the candidate cells that satisfy the event; for event LTM4, the terminal only reports the beam information of the candidate cells that satisfy the event; for event LTM5, the terminal reports the beam information of the serving cell that satisfies the event and the beam information of the candidate cells that satisfy the event. Therefore, for LTM2, if the network side is configured to only report information about the beams that satisfy the event, the default maximum reported beam information N can be configured.

[0493] Option 2: The network side is configured to report information for a maximum of N beams, and the terminal can report information for beams that have not triggered an event. Therefore, for event LTM2, the terminal only reports information for one beam that satisfies the event; for event LTM3, the terminal may report beam information for candidate cells that satisfy the event, as well as beam information for the current serving cell, or only beam information for candidate cells that satisfy the event; for event LTM4, the terminal only reports beam information for candidate cells that satisfy the event; for event LTM5, the terminal reports beam information for the serving cell that satisfies the event and beam information for candidate cells that satisfy the event.

[0494] Regarding the two schemes mentioned above, this embodiment considers that the value of N can be at least one of {1,2,3,4,6,8,12,16}.

[0495] Option 1: For event LTM2, if the network side is configured not to report beam information of untriggered events, then the beam information carried in the MAC CE is the current beam information of the serving cell that triggered the event, including SSBRI or CRI information and the corresponding L1 RSRP information.

[0496] If, for LTM2, the network side is configured to allow the terminal to report beam information for beams that have not triggered events, then the truncated MAC CE may carry, in addition to the beam information for triggered events, some beam information with better quality from candidate cells and / or serving cells. This includes the corresponding SSBRI or CRI information and the corresponding L1 ...

Claims

1. A wireless communication method, performed on a user equipment, comprising: The system receives configuration information sent by the base station, the configuration information including information for determining uplink subband precoding; Send uplink measurement signals to the base station; as well as The system receives codebook-based subband precoding indication information sent by the base station. The codebook-based subband precoding indication information includes at least one of the following: modulation and coding scheme (MCS) indication information, scheduling request indication (SRI) information, the number of layers of the first panel and precoding indication information for one subband of the first panel, precoding indication information for the remaining subbands in the first panel excluding the precoding indication information of the subbands, indication information for subband precoding granularity, second precoding indication information for one subband of the second panel in a multi-panel scenario, and / or precoding indication information for the remaining subbands of the second panel based on a determined set.

2. The wireless communication method according to claim 1, further comprising: The information related to calculating uplink subband precoding is determined, and the information related to calculating uplink subband precoding includes at least one of the following: indication information of uplink subband precoding granularity, codebook information of uplink subband precoding, and / or indication information of subband precoding.

3. The wireless communication method according to claim 2, wherein, The codebook information for the uplink subband precoding is based on the New Radio (NR) system wideband codebook or the Discrete Fourier Transform (DFT) codebook.

4. The wireless communication method according to any one of claims 1 to 3, further comprising: The system reports to the base station its capability to support uplink subband precoding, which includes at least one of the following capabilities: number of antenna ports, antenna coherence relation, support for fully coherent uplink subband precoding, support for partially coherent subband precoding, maximum number of supported subbands, and / or maximum number of supported layers.

5. The wireless communication method according to any one of claims 1 to 4, further comprising: Uplink data information is sent to the base station, and the uplink data information is carried on the Physical Uplink Shared Channel (PUSCH) with subband precoding determined based on the wireless communication method.

6. The wireless communication method according to any one of claims 1 to 5, wherein, The information used to determine uplink subband precoding includes uplink measurement resource configuration information and / or subband precoding granularity information.

7. The wireless communication method according to any one of claims 1 to 6, wherein, The codebook-based subband precoding indication information includes at least one of the following: The first indication information reuses the precoding indication information and layer number indication field in the downlink control information (DCI) indication sent by the base station, and / or determines the subband precoding corresponding to the precoding indication information and layer number indication field as the precoding indication information corresponding to the first subband; The second indication information is used to indicate the precoding indication information of the remaining subbands other than the precoding indication information of the subband indicated by the first indication information; and / or The third indication information is used to indicate the granularity of the subband corresponding to the uplink precoding.

8. The wireless communication method according to claim 7, wherein, The bit overhead of the third indication information is determined according to at least one of the following methods: The subband granularity of the uplink subband precoding is indicated by the base station; Determined based on the capabilities of the user equipment and / or predefined rules; Candidate values ​​for the subband granularity of the uplink subband precoding are determined and indicated by signaling sent by the base station; The candidate value of the subband granularity of the uplink subband precoding is configured by the Radio Resource Control (RRC) signaling sent by the base station, and / or the subband granularity of the uplink subband precoding is indicated by the Media Access Control (MAC) Control Element (CE) signaling or DCI sent by the base station.

9. The wireless communication method according to any one of claims 1 to 8, wherein, The codebook-based subband precoding indication information is carried through two-level downlink control information (DCI).

10. The wireless communication method according to claim 9, wherein, The first-level DCI includes at least one of the following information: the MCS indication information, SRI information, the number of layers of the first panel and the precoding indication information of one sub-band of the first panel, the sub-band granularity of the uplink sub-band precoding, the time-frequency domain resource information corresponding to the second-level DCI, the aggregation level information, and / or the second precoding indication information of one sub-band of the second panel in a multi-panel scenario.

11. The wireless communication method according to claim 9 or 10, wherein, The second-level DCI includes at least one of the following: precoding indication information for the remaining subbands other than the precoding indication information for the subband indicated by the first indication information, and / or precoding indication information for the remaining subbands of the second panel based on a determined set.

12. The wireless communication method according to any one of claims 9 to 11, wherein, The time-frequency domain resource location corresponding to the second-level DCI is located within the Physical Uplink Shared Channel (PUSCH) resource scheduled by the first-level DCI.

13. The wireless communication method according to any one of claims 9 to 12, wherein, The first-level DCI indicates at least one of the following information: time-domain resource allocation indication information, used to indicate the time-domain resource information occupied by the second-level DCI; frequency-domain resource allocation indication information, used to indicate the frequency-domain resource information occupied by the second-level DCI; and / or aggregation level information.

14. The wireless communication method according to any one of claims 9 to 12, wherein, The first-level DCI indicates at least one of the following information: time-domain resource allocation length indication information, frequency-domain resource allocation length indication information, and / or aggregation level information.

15. The wireless communication method according to any one of claims 1 to 14, wherein, The codebook-based subband precoding indication information includes at least one of the following: The first indication information is based on the spatial domain discrete Fourier transform (DFT) codebook, in which a set of orthogonal DFT vectors corresponding to the layer number of the first panel are selected in the spatial domain DFT codebook to form the precoding information of each layer of a subband. The second indication information is used to indicate the precoding indication information of the remaining subbands other than the precoding indication information of the subband indicated by the first indication information; The third indication information is used to indicate the granularity of the subband corresponding to the uplink precoding; and / or The fourth indication information is used to indicate which oversampled group the codebook set of the subband precoding is based on.

16. The wireless communication method according to claim 15, wherein, The first indication information is indicated in at least one of the following ways: The precoding indication information and the layer number joint indication, wherein the precoding indication information is indicated based on the combination number selection method.

17. The wireless communication method according to claim 14 or 15, wherein, The codebook-based subband precoding indication information is carried through two-level downlink control information (DCI).

18. The wireless communication method according to claim 17, wherein, The first-level DCI includes at least one of the following information: the MCS indication information, SRI information, the number of layers of the first panel and the precoding indication information of one sub-band of the first panel, the oversampling basis indication information, the sub-band granularity of the uplink sub-band precoding, the time-frequency domain resource information corresponding to the second-level DCI, the aggregation level information, and / or the second precoding indication information of one sub-band of the second panel in a multi-panel scenario.

19. The wireless communication method according to claim 17 or 18, wherein, The second-level DCI includes at least one of the following: precoding indication information for the remaining subbands other than the precoding indication information for the subband indicated by the first indication information, and / or precoding indication information for the remaining subbands of the second panel based on a determined set.

20. A wireless communication method, performed on a user equipment, comprising: The system receives configuration information sent by the base station, the configuration information including information for determining uplink subband precoding; The system receives downlink measurement signals sent by the base station, performs channel estimation based on the downlink measurement signals, and determines the precoding indication information of the uplink measurement signals based on the estimated channel information. The uplink measurement signal is sent to the base station; as well as The system receives subband precoding indication information based on a non-codebook sent by the base station. The subband precoding indication information based on a non-codebook includes at least one of the following: modulation and coding scheme (MCS) indication information, joint indication information of the number of layers of the first panel and scheduling request indication (SRI) information of a subband of the first panel, subband SRI information of the remaining subbands based on a determined set other than the SRI information of the subband indicated by the first indication information, indication information of subband precoding granularity, second SRI information of one subband of the second panel in a multi-panel scenario, and / or SRI information of the remaining subbands of the second panel based on a determined set.

21. The wireless communication method according to claim 20, further comprising: The information related to calculating uplink subband precoding is determined, and the information related to calculating uplink subband precoding includes at least one of the following: indication information of uplink subband precoding granularity, indication information of uplink non-codebook subband precoding, and / or indication information of subband precoding indication.

22. The wireless communication method according to claim 21, wherein, The indication information for the uplink non-codebook subband precoding is based on the indication information for broadband non-codebook precoding of the New Radio (NR) system.

23. The wireless communication method according to any one of claims 20 to 22, further comprising: The user equipment reports to the base station its ability to support non-codebook subband precoding, the non-codebook subband precoding capability including at least one of the following capabilities: the maximum number of uplink measurement resources that the user equipment can transmit simultaneously, support uplink subband precoding, the maximum number of subbands supported, and / or the maximum number of layers supported.

24. The wireless communication method according to any one of claims 20 to 23, further comprising: Uplink data information is sent to the base station, and the uplink data information is carried on the Physical Uplink Shared Channel (PUSCH) with subband precoding determined based on the wireless communication method.

25. The wireless communication method according to any one of claims 20 to 24, wherein, The information used to determine uplink subband precoding includes uplink measurement resource configuration information and / or subband precoding granularity information.

26. The wireless communication method according to any one of claims 20 to 25, wherein, The non-codebook-based subband precoding indication information includes at least one of the following: The first indication information reuses the SRS resource indication field in the downlink control information (DCI) indication sent by the base station, and / or the first indication information indicates the precoding indication information and / or layer number information of the sub-band of the first panel; The second indication information is used to indicate the precoding indication information of the remaining subbands other than the precoding indication information of the subband indicated by the first indication information; The third indication information is used to indicate the granularity of the subband corresponding to the uplink precoding; The fourth indication information is used to indicate the SRS resource set where the SRS resource corresponding to the SRI information is located under the first indication information and / or the second indication information.

27. The wireless communication method according to claim 26, wherein, The bit overhead of the third indication information is determined according to at least one of the following methods: The subband granularity of the uplink subband precoding is indicated by the base station; Determined based on the capabilities of the user equipment and / or predefined rules; Candidate values ​​for the subband granularity of the uplink subband precoding are determined and indicated by signaling transmitted by the base station; and / or The candidate value of the subband granularity of the uplink subband precoding is configured by the Radio Resource Control (RRC) signaling sent by the base station, and the subband granularity of the uplink subband precoding is indicated by the Media Access Control (MAC) control element (CE) signaling or DCI sent by the base station.

28. The wireless communication method according to any one of claims 20 to 27, wherein, The non-codebook-based subband precoding indication information is carried through two-level downlink control information (DCI).

29. The wireless communication method according to claim 28, wherein, The first-level DCI includes at least one of the following information: the MCS indication information, the first indication information, namely, the joint indication information of the number of layers of the first panel and the SRI information of the first panel's sub-band; and the third indication information, namely, the granularity indication information of the sub-band precoding. The fourth indication information includes the SRS resource set indication information, the time-frequency domain resource information corresponding to the second-level DCI, the aggregation level information, and / or the second precoding indication information of one sub-band of the second panel in a multi-panel scenario.

30. The wireless communication method according to claim 28 or 29, wherein, The second-level DCI includes at least one of the following information: the second indication information, namely, the subband SRI information of the remaining subbands based on a determined set, excluding the first-level DCI indication, and / or the precoding indication information of the remaining subbands of the second panel based on a determined set.

31. The wireless communication method according to claim 28, wherein, The time-frequency domain resource location corresponding to the second-level DCI is located within the Physical Uplink Shared Channel (PUSCH) resource scheduled by the first-level DCI.

32. The wireless communication method according to any one of claims 28 to 31, wherein, The first-level DCI indicates at least one of the following information: time-domain resource allocation indication information, used to indicate the time-domain resource information occupied by the second-level DCI; frequency-domain resource allocation indication information, used to indicate the frequency-domain resource information occupied by the second-level DCI; and / or aggregation level information.

33. The wireless communication method according to any one of claims 28 to 31, wherein, The first-level DCI indicates at least one of the following information: time-domain resource allocation length indication information, frequency-domain resource allocation length indication information, and / or aggregation level information.

34. The wireless communication method according to any one of claims 20 to 25, wherein, The non-codebook-based subband precoding indication information includes at least one of the following: The first indication information is used to indicate which SRS resources have been selected in the SRS resource set, and is indicated by bitmap, combination number or SRS resource index. The second indication information reuses the SRS resource indication field in the DCI indication as the second indication information, and the second indication information indicates the precoding indication information and / or layer number information of one of the subbands; The third indication information is used to indicate the granularity of the subband corresponding to the uplink precoding; and / or The fourth indication information is used to indicate the precoding indication information of the remaining subbands other than the precoding indication information of the subband indicated by the first indication information; and / or The fifth indication information is used to indicate the SRS resource set to which the SRS resource selected under the first indication information, the second indication information, and / or the third indication information belongs.

35. The wireless communication method according to claim 34, wherein, The non-codebook-based subband precoding indication information is carried through two levels of downlink control information (DCI). The first level DCI includes at least one of the following: the MCS indication information, the first indication information (i.e., SRS resource subset selection indication information), the second indication information (i.e., the joint indication information of the layer number of the first panel and the SRI information of a subband of the first panel), the third indication information (i.e., the granularity indication information of the subband precoding), the fifth indication information (i.e., the SRS resource set indication information), the time-frequency domain resource information corresponding to the second level DCI, the aggregation level information, and / or the second precoding indication information of one subband of the second panel in a multi-panel scenario. The second level DCI includes at least one of the following: the fourth indication information (i.e., the subband SRI information of the remaining subbands based on a determined set, excluding the first DCI level indication), and / or the precoding indication information of the remaining subbands of the second panel based on a determined set.

36. A wireless communication method, performed on a user equipment, comprising: The system receives configuration information sent by the base station, the configuration information including information for determining uplink subband precoding; The uplink measurement signal is sent to the base station; as well as The system receives subband precoding indication information sent by the base station. The subband precoding indication information includes at least one of the following: joint indication information of the number of spatial bases and spatial base selection, joint indication information of the number of frequency bases and frequency base selection, codebook parameter combination information, non-zero coefficient selection factor indication information, subband precoding granularity indication information, and / or, in a multi-panel scenario, part or all of the following information: joint indication information of the number of spatial bases and spatial base selection, joint indication information of the number of frequency bases and frequency base selection, codebook parameter combination information, non-zero coefficient selection factor indication information, and subband precoding granularity indication information for the second panel.

37. The wireless communication method according to claim 36, further comprising: The information related to calculating uplink subband precoding is determined, and the information related to calculating uplink subband precoding includes at least one of the following: indication information of uplink subband precoding granularity, spatial basis number and selection indication information, frequency basis number and selection indication information, and / or uplink codebook parameter combination information.

38. The wireless communication method according to claim 36 or 37, further comprising: The uplink subband precoding capability information is reported to the base station. The uplink subband precoding capability information includes at least one of the following capabilities: number of antenna ports, antenna coherence relation, maximum number of supported subbands, maximum number of supported layers, maximum number of supported spatial basis layers, maximum number of supported frequency basis layers, and / or maximum number of supported spatial and frequency basis layers.

39. The wireless communication method according to any one of claims 36 to 38, further comprising: Uplink data information is sent to the base station, and the uplink data information is carried on the Physical Uplink Shared Channel (PUSCH) with subband precoding determined based on the wireless communication method.

40. The wireless communication method according to any one of claims 36 to 39, wherein, The information used to determine uplink subband precoding includes uplink measurement resource configuration information and / or subband precoding granularity information.

41. The wireless communication method according to any one of claims 37 to 40, wherein, The number of spatial bases and the indication method for selection indication information adopt at least one of the following methods: The number of spatial bases is indicated by the base station, and the number of spatial bases and which spatial bases were selected are jointly indicated; The codebook parameter combination list of Rel-16 eType-II is reused, and a codebook parameter combination with a spatial basis of 1 is added. and / or The number of spatial bases and the selected spatial base information respectively indicate that the spatial base belongs to a data set composed of multiple spatial base numbers.

42. The wireless communication method according to any one of claims 37 to 41, wherein, The number of frequency domain bases and the selection indication information are obtained in at least one of the following ways: The number of frequency domain substrates is indicated by the base station, and the number of frequency domain substrates and which frequency domain substrates were selected are jointly indicated; The codebook parameter combination list of Rel-16 eType-II is reused, and a codebook parameter combination with a spatial basis of 1 is added. and / or The number of frequency domain bases and the selected frequency domain base information respectively indicate that the number of frequency domain bases belongs to a data set composed of multiple frequency domain base numbers.

43. The wireless communication method according to claim 39, wherein, The uplink subband precoding is obtained based on the Rel-16 eType-II codebook, and the uplink subband precoding is indicated by two-level DCI.

44. The wireless communication method according to claim 43, wherein, The indication content of the uplink subband pre-encoded instruction is adopted in at least one of the following ways: The uplink subband precoding indication information is divided into two parts, wherein the first part is carried in the first-level DCI and the second part is carried in the second-level DCI, and the bit overhead of the second part is determined based on the first part. The uplink subband precoding indication information is divided into two parts, wherein the first part is carried in the first-level DCI and the second part is carried in the second-level DCI, wherein the recovery of the subband precoding is at least completed based on the first part; and / or The uplink subband precoding indication information is divided into two parts, and both parts are carried in the second-level DCI indication information, while the first-level DCI carries the time-frequency domain location information of the second-level DCI.

45. The wireless communication method according to claim 44, wherein, The information carried by the first-level DCI includes at least one of the following: RI indication information, total number of non-zero coefficients, number of spatial bases, indication information of the number and selection of spatial bases, indication information of the selected spatial bases, codebook parameter selection indication information, indication information related to the number of subbands or precoding granularity, number of frequency bases, indication information of the number and selection of frequency bases, indication information of the selected frequency bases, indication information of the selection of frequency base coefficients, codebook parameter selection indication information, factor indication information of the maximum number of non-zero coefficients, time-frequency domain resource location of the second-level DCI, and / or aggregation level and / or DCI format information corresponding to the second-level DCI.

46. ​​The wireless communication method according to claim 44 or 45, wherein, The information carried by the second-level DCI includes at least one of the following: bitmap information of non-zero coefficients, position indication information of the largest non-zero coefficient, non-zero coefficient indication information, oversampling basis selection indication, RI indication information, total number of non-zero coefficients, spatial basis number information, spatial basis number and selection indication information, selected spatial basis indication information, codebook parameter selection indication information, subband number related indication information or precoding granularity related indication information, frequency domain basis number information, frequency domain basis number and selection indication information, selected frequency domain basis indication information, frequency domain basis coefficient selection indication information, codebook parameter selection indication information, and / or factor indication information of the largest non-zero coefficient number.

47. The wireless communication method according to any one of claims 36 to 46, wherein, The bit overhead of the sub-band precoding granularity indication information is determined according to at least one of the following methods: The subband granularity of the uplink subband precoding is indicated by the base station; Determined based on the capabilities of the user equipment and / or predefined rules; Candidate values ​​for the subband granularity of the uplink subband precoding are determined and indicated by signaling sent by the base station; The candidate value of the subband granularity of the uplink subband precoding is configured by the Radio Resource Control (RRC) signaling sent by the base station, and / or the subband granularity of the uplink subband precoding is indicated by the Media Access Control (MAC) Control Element (CE) signaling or DCI sent by the base station.

48. A wireless communication method, performed on a user equipment, comprising: The system receives configuration information sent by the base station, the configuration information including information for determining uplink subband precoding; The system receives downlink measurement signals sent by the base station, performs channel estimation based on the downlink measurement signals, and determines the precoding indication information of the uplink measurement signals based on the estimated channel information. The uplink measurement signal is sent to the base station; as well as The system receives subband precoding indication information sent by the base station. The subband precoding indication information includes at least one of the following: modulation and coding scheme (MCS) indication information, antenna port number and selection joint indication information, frequency domain substrate number, frequency domain substrate selection and window length joint indication information, codebook parameter combination information, non-zero coefficient selection factor indication information, subband precoding granularity indication information, and / or, in multi-panel scenarios, part or all of the following information: spatial domain substrate number and spatial domain substrate selection joint indication information, frequency domain substrate number and frequency domain substrate selection joint indication information, codebook parameter combination information, non-zero coefficient selection factor indication information, and subband precoding granularity indication information for the second panel.

49. The wireless communication method according to claim 48, further comprising: The information related to calculating uplink subband precoding is determined, and the information related to calculating uplink subband precoding includes at least one of the following: information for determining the granularity of uplink subband precoding, the number of antenna ports and selection indication information, the number of frequency domain substrates and selection indication information, and / or uplink codebook parameter combination information.

50. The wireless communication method according to any one of claims 48 or 49, further comprising: The uplink subband precoding capability information is reported to the base station. The uplink subband precoding capability information includes at least one of the following capabilities: number of antenna ports, antenna coherence relation, number of supported antenna ports and frequency domain substrates, maximum number of supported subbands, and / or maximum number of supported layers.

51. The wireless communication method according to any one of claims 48 to 50, further comprising: Uplink data information is sent to the base station, and the uplink data information is carried on the Physical Uplink Shared Channel (PUSCH) with subband precoding determined based on the wireless communication method.

52. The wireless communication method according to any one of claims 48 to 51, wherein, The information used to determine uplink subband precoding includes uplink measurement resource configuration information and / or subband precoding granularity information.

53. The wireless communication method according to any one of claims 48 to 52, wherein, The subband precoding indication information is carried through a two-level DCI.

54. The wireless communication method according to claim 53, wherein, The first-level DCI includes at least one of the following information: MCS indication information, number of maximum non-zero coefficients, joint indication information of antenna port number and selection, number of frequency domain substrates, joint indication information of frequency domain substrate selection and window length, codebook parameter combination information, non-zero coefficient selection factor indication information, sub-band precoding granularity indication information, and in multi-panel scenarios, partial or all of the following information: number of spatial domain substrates and joint indication information of spatial domain substrate selection for the second panel, number of frequency domain substrates and joint indication information of frequency domain substrate selection, codebook parameter combination information, non-zero coefficient selection factor indication information, sub-band precoding granularity indication information, and / or time-frequency domain resource information corresponding to the second-level DCI.

55. The wireless communication method according to claim 53 or 54, wherein, The second-level DCI includes at least one of the following information: location indication information of the maximum non-zero coefficient, bitmap indication information of the non-zero coefficient, amplitude and phase indication information of the non-zero coefficient, and / or oversampling substrate indication information.

56. The wireless communication method according to any one of claims 48 to 55, wherein, The bit overhead of the sub-band precoding granularity indication information is determined according to at least one of the following methods: The subband granularity of the uplink subband precoding is indicated by the base station; Determined based on the capabilities of the user equipment and / or predefined rules; Candidate values ​​for the subband granularity of the uplink subband precoding are determined and indicated by signaling sent by the base station; The candidate value of the subband granularity of the uplink subband precoding is configured by the Radio Resource Control (RRC) signaling sent by the base station, and / or the subband granularity of the uplink subband precoding is indicated by the Media Access Control (MAC) Control Element (CE) signaling or DCI sent by the base station.

57. A wireless communication method, performed at a base station, comprising: Send configuration information to the user equipment, the configuration information including information for determining uplink subband precoding; Receive the uplink measurement signal sent by the user equipment; as well as The codebook-based subband precoding indication information is sent to the user equipment. The codebook-based subband precoding indication information includes at least one of the following: modulation and coding scheme (MCS) indication information, scheduling request indication (SRI) information, the number of layers of the first panel and the precoding indication information of one subband of the first panel, the precoding indication information of the remaining subbands in the first panel other than the precoding indication information of the subband, the indication information of the subband precoding granularity, the second precoding indication information of one subband of the second panel in a multi-panel scenario, and / or the precoding indication information of the remaining subbands of the second panel based on a determined set.

58. The wireless communication method according to claim 57, further comprising: The information related to calculating uplink subband precoding is determined, and the information related to calculating uplink subband precoding includes at least one of the following: indication information of uplink subband precoding granularity, codebook information of uplink subband precoding, and / or indication information of subband precoding.

59. The wireless communication method according to claim 58, wherein, The codebook information for the uplink subband precoding is based on the New Radio (NR) system wideband codebook or the Discrete Fourier Transform (DFT) codebook.

60. The wireless communication method according to any one of claims 57 to 59, further comprising: The system reports to the base station its capability to support uplink subband precoding, which includes at least one of the following capabilities: number of antenna ports, antenna coherence relation, support for fully coherent uplink subband precoding, support for partially coherent subband precoding, maximum number of supported subbands, and / or maximum number of supported layers.

61. The wireless communication method according to any one of claims 57 to 60, further comprising: The system receives uplink data information sent by the user equipment, the uplink data information being carried on the Physical Uplink Shared Channel (PUSCH) with subband precoding determined based on the wireless communication method.

62. The wireless communication method according to any one of claims 57 to 61, wherein, The information used to determine uplink subband precoding includes uplink measurement resource configuration information and / or subband precoding granularity information.

63. The wireless communication method according to any one of claims 57 to 62, wherein, The codebook-based subband precoding indication information includes at least one of the following: The first indication information reuses the precoding indication information and layer number indication field in the downlink control information (DCI) indication sent by the base station, and / or determines the subband precoding corresponding to the precoding indication information and layer number indication field as the precoding indication information corresponding to the first subband; The second indication information is used to indicate the precoding indication information of the remaining subbands other than the precoding indication information of the subband indicated by the first indication information; and / or The third indication information is used to indicate the granularity of the subband corresponding to the uplink precoding.

64. The wireless communication method according to claim 63, wherein, The bit overhead of the third indication information is determined according to at least one of the following methods: The subband granularity of the uplink subband precoding is indicated by the base station; Determined based on the capabilities of the user equipment and / or predefined rules; Candidate values ​​for the subband granularity of the uplink subband precoding are determined and indicated by signaling sent by the base station; The candidate value of the subband granularity of the uplink subband precoding is configured by the Radio Resource Control (RRC) signaling sent by the base station, and / or the subband granularity of the uplink subband precoding is indicated by the Media Access Control (MAC) Control Element (CE) signaling or DCI sent by the base station.

65. The wireless communication method according to any one of claims 57 to 64, wherein, The codebook-based subband precoding indication information is carried through two-level downlink control information (DCI).

66. The wireless communication method according to claim 65, wherein, The first-level DCI includes at least one of the following information: the MCS indication information, SRI information, the number of layers of the first panel and the precoding indication information of one sub-band of the first panel, the sub-band granularity of the uplink sub-band precoding, the time-frequency domain resource information corresponding to the second-level DCI, the aggregation level information, and / or the second precoding indication information of one sub-band of the second panel in a multi-panel scenario.

67. The wireless communication method according to claim 65 or 66, wherein, The second-level DCI includes at least one of the following: precoding indication information for the remaining subbands other than the precoding indication information for the subband indicated by the first indication information, and / or precoding indication information for the remaining subbands of the second panel based on a determined set.

68. The wireless communication method according to any one of claims 65 to 67, wherein, The time-frequency domain resource location corresponding to the second-level DCI is located within the Physical Uplink Shared Channel (PUSCH) resource scheduled by the first-level DCI.

69. The wireless communication method according to any one of claims 65 to 68, wherein, The first-level DCI indicates at least one of the following information: time-domain resource allocation indication information, used to indicate the time-domain resource information occupied by the second-level DCI; frequency-domain resource allocation indication information, used to indicate the frequency-domain resource information occupied by the second-level DCI; and / or aggregation level information.

70. The wireless communication method according to any one of claims 65 to 68, wherein, The first-level DCI indicates at least one of the following information: time-domain resource allocation length indication information, frequency-domain resource allocation length indication information, and / or aggregation level information.

71. The wireless communication method according to any one of claims 57 to 70, wherein, The codebook-based subband precoding indication information includes at least one of the following: The first indication information is based on the spatial domain discrete Fourier transform (DFT) codebook, in which a set of orthogonal DFT vectors corresponding to the layer number of the first panel are selected in the spatial domain DFT codebook to form the precoding information of each layer of a subband. The second indication information is used to indicate the precoding indication information of the remaining subbands other than the precoding indication information of the subband indicated by the first indication information; The third indication information is used to indicate the granularity of the subband corresponding to the uplink precoding; and / or The fourth indication information is used to indicate which oversampled group the codebook set of the subband precoding is based on.

72. The wireless communication method according to claim 71, wherein, The first indication information is indicated in at least one of the following ways: The precoding indication information and the layer number joint indication, wherein the precoding indication information is indicated based on the combination number selection method.

73. The wireless communication method according to claim 70 or 71, wherein, The codebook-based subband precoding indication information is carried through two-level downlink control information (DCI).

74. The wireless communication method according to claim 73, wherein, The first-level DCI includes at least one of the following information: the MCS indication information, SRI information, the number of layers of the first panel and the precoding indication information of one sub-band of the first panel, the oversampling basis indication information, the sub-band granularity of the uplink sub-band precoding, the time-frequency domain resource information corresponding to the second-level DCI, the aggregation level information, and / or the second precoding indication information of one sub-band of the second panel in a multi-panel scenario.

75. The wireless communication method according to claim 73 or 74, wherein, The second-level DCI includes at least one of the following: precoding indication information for the remaining subbands other than the precoding indication information for the subband indicated by the first indication information, and / or precoding indication information for the remaining subbands of the second panel based on a determined set.

76. A wireless communication method, performed at a base station, comprising: Send configuration information to the user equipment, the configuration information including information for determining uplink subband precoding; Send downlink measurement signals to the user equipment, perform channel estimation based on the downlink measurement signals, and determine the precoding indication information of the uplink measurement signals based on the estimated channel information; Receive the uplink measurement signal sent by the user equipment; as well as The user equipment is sent with subband precoding indication information based on a non-codebook, the non-codebook-based subband precoding indication information including at least one of the following: modulation and coding scheme (MCS) indication information, joint indication information of the number of layers of the first panel and scheduling request indication (SRI) information of a subband of the first panel, subband SRI information of the remaining subbands based on a determined set other than the SRI information of the subband indicated by the first indication information, indication information of subband precoding granularity, second SRI information of one subband of the second panel in a multi-panel scenario, and / or SRI information of the remaining subbands of the second panel based on a determined set.

77. The wireless communication method according to claim 76, further comprising: The information related to calculating uplink subband precoding is determined, and the information related to calculating uplink subband precoding includes at least one of the following: indication information of uplink subband precoding granularity, indication information of uplink non-codebook subband precoding, and / or indication information of subband precoding indication.

78. The wireless communication method according to claim 77, wherein, The indication information for the uplink non-codebook subband precoding is based on the indication information for broadband non-codebook precoding of the New Radio (NR) system.

79. The wireless communication method according to any one of claims 76 to 78, further comprising: The user equipment receives a report from the user equipment regarding its ability to support non-codebook subband precoding, wherein the non-codebook subband precoding capability includes at least one of the following capabilities: the maximum number of uplink measurement resources that the user equipment can transmit simultaneously, support uplink subband precoding, the maximum number of subbands supported, and / or the maximum number of layers supported.

80. The wireless communication method according to any one of claims 76 to 79, further comprising: The system receives uplink data information sent by the user equipment, the uplink data information being carried on the Physical Uplink Shared Channel (PUSCH) with subband precoding determined based on the wireless communication method.

81. The wireless communication method according to any one of claims 76 to 80, wherein, The information used to determine uplink subband precoding includes uplink measurement resource configuration information and / or subband precoding granularity information.

82. The wireless communication method according to any one of claims 76 to 81, wherein, The non-codebook-based subband precoding indication information includes at least one of the following: The first indication information reuses the SRS resource indication field in the downlink control information (DCI) indication sent by the base station, and / or the first indication information indicates the precoding indication information and / or layer number information of the sub-band of the first panel; The second indication information is used to indicate the precoding indication information of the remaining subbands other than the precoding indication information of the subband indicated by the first indication information; The third indication information is used to indicate the granularity of the subband corresponding to the uplink precoding; The fourth indication information is used to indicate the SRS resource set where the SRS resource corresponding to the SRI information is located under the first indication information and / or the second indication information.

83. The wireless communication method according to claim 81, wherein, The bit overhead of the third indication information is determined according to at least one of the following methods: The subband granularity of the uplink subband precoding is indicated by the base station; Determined based on the capabilities of the user equipment and / or predefined rules; Candidate values ​​for the subband granularity of the uplink subband precoding are determined and indicated by signaling transmitted by the base station; and / or The candidate value of the subband granularity of the uplink subband precoding is configured by the Radio Resource Control (RRC) signaling sent by the base station, and the subband granularity of the uplink subband precoding is indicated by the Media Access Control (MAC) control element (CE) signaling or DCI sent by the base station.

84. The wireless communication method according to any one of claims 76 to 83, wherein, The non-codebook-based subband precoding indication information is carried through two-level downlink control information (DCI).

85. The wireless communication method according to claim 84, wherein, The first-level DCI includes at least one of the following information: the MCS indication information, the first indication information, namely, the joint indication information of the number of layers of the first panel and the SRI information of the first panel's sub-band; and the third indication information, namely, the granularity indication information of the sub-band precoding. The fourth indication information includes the SRS resource set indication information, the time-frequency domain resource information corresponding to the second-level DCI, the aggregation level information, and / or the second precoding indication information of one sub-band of the second panel in a multi-panel scenario.

86. The wireless communication method according to claim 84 or 85, wherein, The second-level DCI includes at least one of the following information: the second indication information, namely, the subband SRI information of the remaining subbands based on a determined set, excluding the first-level DCI indication, and / or the precoding indication information of the remaining subbands of the second panel based on a determined set.

87. The wireless communication method according to claim 84, wherein, The time-frequency domain resource location corresponding to the second-level DCI is located within the Physical Uplink Shared Channel (PUSCH) resource scheduled by the first-level DCI.

88. The wireless communication method according to any one of claims 84 to 87, wherein, The first-level DCI indicates at least one of the following information: time-domain resource allocation indication information, used to indicate the time-domain resource information occupied by the second-level DCI; frequency-domain resource allocation indication information, used to indicate the frequency-domain resource information occupied by the second-level DCI; and / or aggregation level information.

89. The wireless communication method according to any one of claims 84 to 87, wherein, The first-level DCI indicates at least one of the following information: time-domain resource allocation length indication information, frequency-domain resource allocation length indication information, and / or aggregation level information.

90. The wireless communication method according to any one of claims 76 to 81, wherein, The non-codebook-based subband precoding indication information includes at least one of the following: The first indication information is used to indicate which SRS resources have been selected in the SRS resource set, and is indicated by bitmap, combination number or SRS resource index. The second indication information reuses the SRS resource indication field in the DCI indication as the second indication information, and the second indication information indicates the precoding indication information and / or layer number information of one of the subbands; The third indication information is used to indicate the granularity of the subband corresponding to the uplink precoding; and / or The fourth indication information is used to indicate the precoding indication information of the remaining subbands other than the precoding indication information of the subband indicated by the first indication information; and / or The fifth indication information is used to indicate the SRS resource set to which the SRS resource selected under the first indication information, the second indication information, and / or the third indication information belongs.

91. The wireless communication method according to claim 90, wherein, The non-codebook-based subband precoding indication information is carried through two levels of downlink control information (DCI). The first level DCI includes at least one of the following: the MCS indication information, the first indication information (i.e., SRS resource subset selection indication information), the second indication information (i.e., the joint indication information of the layer number of the first panel and the SRI information of a subband of the first panel), the third indication information (i.e., the granularity indication information of the subband precoding), the fifth indication information (i.e., the SRS resource set indication information), the time-frequency domain resource information corresponding to the second level DCI, the aggregation level information, and / or the second precoding indication information of one subband of the second panel in a multi-panel scenario. The second level DCI includes at least one of the following: the fourth indication information (i.e., the subband SRI information of the remaining subbands based on a determined set, excluding the first DCI level indication), and / or the precoding indication information of the remaining subbands of the second panel based on a determined set.

92. A wireless communication method, performed at a base station, comprising: Send configuration information to the user equipment, the configuration information including information for determining uplink subband precoding; Receive the uplink measurement signal sent by the user equipment; as well as The user equipment is sent subband precoding indication information, which includes at least one of the following: joint indication information of the number of spatial bases and spatial base selection, joint indication information of the number of frequency bases and frequency base selection, codebook parameter combination information, non-zero coefficient selection factor indication information, subband precoding granularity indication information, and / or, in a multi-panel scenario, part or all of the following information: joint indication information of the number of spatial bases and spatial base selection, joint indication information of the number of frequency bases and frequency base selection, codebook parameter combination information, non-zero coefficient selection factor indication information, and subband precoding granularity indication information for the second panel.

93. The wireless communication method according to claim 92, further comprising: The information related to calculating uplink subband precoding is determined, and the information related to calculating uplink subband precoding includes at least one of the following: indication information of uplink subband precoding granularity, spatial basis number and selection indication information, frequency basis number and selection indication information, and / or uplink codebook parameter combination information.

94. The wireless communication method according to claim 92 or 93, further comprising: The system receives uplink subband precoding capability information reported by the user equipment. The uplink subband precoding capability information includes at least one of the following capabilities: number of antenna ports, antenna coherence relation, maximum number of supported subbands, maximum number of supported layers, maximum number of supported spatial basis layers, maximum number of supported frequency basis layers, and / or maximum number of supported spatial and frequency basis layers.

95. The wireless communication method according to any one of claims 92 to 94, further comprising: The system receives uplink data information sent by the user equipment, the uplink data information being carried on the Physical Uplink Shared Channel (PUSCH) with subband precoding determined based on the wireless communication method.

96. The wireless communication method according to any one of claims 92 to 95, wherein, The information used to determine uplink subband precoding includes uplink measurement resource configuration information and / or subband precoding granularity information.

97. The wireless communication method according to any one of claims 93 to 96, wherein, The number of spatial bases and the indication method for selection indication information adopt at least one of the following methods: The number of spatial bases is indicated by the base station, and the number of spatial bases and which spatial bases were selected are jointly indicated; The codebook parameter combination list of Rel-16 eType-II is reused, and a codebook parameter combination with a spatial basis of 1 is added. and / or The number of spatial bases and the selected spatial base information respectively indicate that the spatial base belongs to a data set composed of multiple spatial base numbers.

98. The wireless communication method according to any one of claims 93 to 97, wherein, The number of frequency domain bases and the selection indication information are obtained in at least one of the following ways: The number of frequency domain substrates is indicated by the base station, and the number of frequency domain substrates and which frequency domain substrates were selected are jointly indicated; The codebook parameter combination list of Rel-16 eType-II is reused, and a codebook parameter combination with a spatial basis of 1 is added. and / or The number of frequency domain bases and the selected frequency domain base information respectively indicate that the number of frequency domain bases belongs to a data set composed of multiple frequency domain base numbers.

99. The wireless communication method according to claim 95, wherein, The uplink subband precoding is obtained based on the Rel-16 eType-II codebook, and the uplink subband precoding is indicated by two-level DCI.

100. The wireless communication method according to claim 99, wherein, The indication content of the uplink subband pre-encoded instruction is adopted in at least one of the following ways: The uplink subband precoding indication information is divided into two parts, wherein the first part is carried in the first-level DCI and the second part is carried in the second-level DCI, and the bit overhead of the second part is determined based on the first part. The uplink subband precoding indication information is divided into two parts, wherein the first part is carried in the first-level DCI and the second part is carried in the second-level DCI, wherein the recovery of the subband precoding is at least completed based on the first part; and / or The uplink subband precoding indication information is divided into two parts, and both parts are carried in the second-level DCI indication information, while the first-level DCI carries the time-frequency domain location information of the second-level DCI.

101. The wireless communication method according to claim 100, wherein, The information carried by the first-level DCI includes at least one of the following: RI indication information, total number of non-zero coefficients, number of spatial bases, indication information of the number and selection of spatial bases, indication information of the selected spatial bases, codebook parameter selection indication information, indication information related to the number of subbands or precoding granularity, number of frequency bases, indication information of the number and selection of frequency bases, indication information of the selected frequency bases, indication information of the selection of frequency base coefficients, codebook parameter selection indication information, factor indication information of the maximum number of non-zero coefficients, time-frequency domain resource location of the second-level DCI, and / or aggregation level and / or DCI format information corresponding to the second-level DCI.

102. The wireless communication method according to claim 100 or 101, wherein, The information carried by the second-level DCI includes at least one of the following: bitmap information of non-zero coefficients, position indication information of the largest non-zero coefficient, non-zero coefficient indication information, oversampling basis selection indication, RI indication information, total number of non-zero coefficients, spatial basis number information, spatial basis number and selection indication information, selected spatial basis indication information, codebook parameter selection indication information, subband number related indication information or precoding granularity related indication information, frequency domain basis number information, frequency domain basis number and selection indication information, selected frequency domain basis indication information, frequency domain basis coefficient selection indication information, codebook parameter selection indication information, and / or factor indication information of the largest non-zero coefficient number.

103. The wireless communication method according to any one of claims 92 to 102, wherein, The bit overhead of the sub-band precoding granularity indication information is determined according to at least one of the following methods: The subband granularity of the uplink subband precoding is indicated by the base station; Determined based on the capabilities of the user equipment and / or predefined rules; Candidate values ​​for the subband granularity of the uplink subband precoding are determined and indicated by signaling sent by the base station; The candidate value of the subband granularity of the uplink subband precoding is configured by the Radio Resource Control (RRC) signaling sent by the base station, and / or the subband granularity of the uplink subband precoding is indicated by the Media Access Control (MAC) Control Element (CE) signaling or DCI sent by the base station.

104. A wireless communication method, performed at a base station, comprising: Send configuration information to the user equipment, the configuration information including information for determining uplink subband precoding; Send downlink measurement signals to the user equipment, perform channel estimation based on the downlink measurement signals, and determine the precoding indication information of the uplink measurement signals based on the estimated channel information; Receive the uplink measurement signal sent by the user equipment; as well as The user equipment is sent subband precoding indication information, which includes at least one of the following: modulation and coding scheme (MCS) indication information, antenna port number and selection joint indication information, frequency domain substrate number, frequency domain substrate selection and window length joint indication information, codebook parameter combination information, non-zero coefficient selection factor indication information, subband precoding granularity indication information, and / or, in a multi-panel scenario, part or all of the following information: spatial domain substrate number and spatial domain substrate selection joint indication information, frequency domain substrate number and frequency domain substrate selection joint indication information, codebook parameter combination information, non-zero coefficient selection factor indication information, and subband precoding granularity indication information for the second panel.

105. The wireless communication method according to claim 104, further comprising: The information related to calculating uplink subband precoding is determined, and the information related to calculating uplink subband precoding includes at least one of the following: information for determining the granularity of uplink subband precoding, the number of antenna ports and selection indication information, the number of frequency domain substrates and selection indication information, and / or uplink codebook parameter combination information.

106. The wireless communication method according to any one of claims 104 or 105, further comprising: The system receives uplink subband precoding capability information reported by the user equipment. The uplink subband precoding capability information includes at least one of the following capabilities: number of antenna ports, antenna coherence relation, number of supported antenna ports and frequency domain substrates, maximum number of supported subbands, and / or maximum number of supported layers.

107. The wireless communication method according to any one of claims 104 to 106, further comprising: The system receives uplink data information sent by the user equipment, the uplink data information being carried on the Physical Uplink Shared Channel (PUSCH) with subband precoding determined based on the wireless communication method.

108. The wireless communication method according to any one of claims 104 to 107, wherein, The information used to determine uplink subband precoding includes uplink measurement resource configuration information and / or subband precoding granularity information.

109. The wireless communication method according to any one of claims 104 to 108, wherein, The subband precoding indication information is carried through a two-level DCI.

110. The wireless communication method according to claim 109, wherein, The first-level DCI includes at least one of the following information: MCS indication information, number of maximum non-zero coefficients, joint indication information of antenna port number and selection, number of frequency domain substrates, joint indication information of frequency domain substrate selection and window length, codebook parameter combination information, non-zero coefficient selection factor indication information, sub-band precoding granularity indication information, and in multi-panel scenarios, partial or all of the following information: number of spatial domain substrates and joint indication information of spatial domain substrate selection for the second panel, number of frequency domain substrates and joint indication information of frequency domain substrate selection, codebook parameter combination information, non-zero coefficient selection factor indication information, sub-band precoding granularity indication information, and / or time-frequency domain resource information corresponding to the second-level DCI.

111. The wireless communication method according to claim 109 or 110, wherein, Level 2 DCI contains at least one of the following information: Location indication information of the maximum non-zero coefficient, bitmap indication information of the non-zero coefficient, amplitude and phase indication information of the non-zero coefficient, and / or oversampling substrate indication information.

112. The wireless communication method according to any one of claims 104 to 111, wherein, The bit overhead of the sub-band precoding granularity indication information is determined according to at least one of the following methods: The subband granularity of the uplink subband precoding is indicated by the base station; Determined based on the capabilities of the user equipment and / or predefined rules; Candidate values ​​for the subband granularity of the uplink subband precoding are determined and indicated by signaling sent by the base station; The candidate value of the subband granularity of the uplink subband precoding is configured by the Radio Resource Control (RRC) signaling sent by the base station, and / or the subband granularity of the uplink subband precoding is indicated by the Media Access Control (MAC) Control Element (CE) signaling or DCI sent by the base station.

113. A wireless communication method, performed on a user equipment, comprising: When the event triggering condition is met, the user equipment reports the Layer 1 (L1) measurement results triggered by the event by sending a dedicated SR message to the base station and reporting the measurement results based on the L1 measurement to the base station, including at least one of the following operations: When the dedicated scheduling request (SR) is multiplexed with the uplink control information (UCI), the dedicated SR is retained. When the dedicated SR is multiplexed for transmission on the physical uplink shared channel (PUSCH), it carries a dedicated SR request message. The measurement results are reported to the base station via the Media Access Control Unit (MAC CE). The beam information of the triggered event is preferentially mapped to the beam information of the non-triggered event in the normal or truncated MAC CE. When truncation occurs, the measurement beam information of the non-triggered event is preferentially truncated.

114. The wireless communication method according to claim 113, wherein, The event triggering conditions are based on at least one of the following events defined in Layer 2 (L2): L2 trigger measurement event, Layer 3 (L3) trigger measurement event, Layer 4 (L4) trigger measurement event, and Layer 5 (L5) trigger measurement event.

115. The wireless communication method according to claim 113 or 114, wherein, The reference signal measured in Layer 1 is either the Channel State Information Reference Signal (CSI-RS) or the Synchronization Signal Block (SSB).

116. The wireless communication method according to any one of claims 113 to 115, wherein, The reported measurement results include at least one of the following information: the resource index corresponding to the beam, the layer 1 reference signal received power L1-RSRP, the layer 1 signal-to-interference-plus-noise ratio L1-SINR, the reporting configuration identifier ID, and the event configuration ID.

117. The wireless communication method according to any one of claims 113 to 116, wherein, The user equipment receives a cell handover command from the base station, the cell handover command including beam selection information for indicating candidate cells.

118. A wireless communication method, performed on a user equipment, comprising: Receive channel measurement reference signal; The user equipment receives channel measurement indication information sent by the serving cell. The channel measurement indication information is carried by downlink control information (DCI) or media access control and control unit (MAC CE) and includes at least one of the following information: bitmap, cell index, resource index, number of combinations, transmission configuration indication (TCI) status, and channel state information (CSI) measurement indication information, instructing the user equipment to perform CSI measurement on the reference signal of the candidate cell.

119. The wireless communication method according to claim 118, wherein, After receiving the channel measurement indication information, the user equipment begins to measure the CSI of some or all candidate cells, or begins to measure the CSI of some or all candidate cells based on a specific point in time.

120. The wireless communication method according to claim 118 or 119, wherein, The channel measurement reference signal is transmitted by the candidate cell or by the serving cell respectively.

121. The wireless communication method according to any one of claims 118 to 120, wherein, The CSI measurement includes at least one of the following: Layer 1 Reference Signal Received Power (L1-RSRP) and Layer 1 Signal-to-Interference-Ratio (L1-SINR).

122. The wireless communication method according to any one of claims 118 to 121, wherein, After receiving a cell handover command, the user equipment reports the CSI measurement results to the target cell.

123. A wireless communication method, executed at a base station, comprising: When the event triggering condition is met, the base station receives a dedicated SR message sent by the user equipment for the layer-1 L1 measurement result report triggered by the event, and receives the measurement results based on L1 measurement reported by the user equipment, including at least one of the following operations: When the dedicated scheduling request (SR) is multiplexed with the uplink control information (UCI), the dedicated SR is retained. When the dedicated SR is multiplexed for transmission on the physical uplink shared channel (PUSCH), it carries a dedicated SR request message. The measurement results reported by the user equipment are received through the Media Access Control Component Unit (MAC CE). The beam information of the triggered event is preferentially mapped relative to the beam information of the non-triggered event in the normal or truncated MAC CE. When truncation occurs, the measurement beam information of the non-triggered event is preferentially truncated.

124. The wireless communication method according to claim 123, wherein, The event triggering conditions are based on at least one of the following events defined in Layer 2 (L2): L2 trigger measurement event, Layer 3 (L3) trigger measurement event, Layer 4 (L4) trigger measurement event, and Layer 5 (L5) trigger measurement event.

125. The wireless communication method according to claim 123 or 124, wherein, The reference signal measured in Layer 1 is either the Channel State Information Reference Signal (CSI-RS) or the Synchronization Signal Block (SSB).

126. The wireless communication method according to any one of claims 123 to 125, wherein, The reported measurement results include at least one of the following information: the resource index corresponding to the beam, the layer 1 reference signal received power L1-RSRP, the layer 1 signal-to-interference-plus-noise ratio L1-SINR, the reporting configuration identifier ID, and the event configuration ID.

127. The wireless communication method according to any one of claims 123 to 126, wherein, The base station sends a cell handover command to the user equipment, the cell handover command including beam selection information for indicating candidate cells.

128. A wireless communication method, executed on a base station side, comprising: Send channel measurement reference signals to user equipment; The serving cell sends channel measurement indication information to the user equipment. The channel measurement indication information is carried by downlink control information (DCI) or media access control and control unit (MAC CE) and includes at least one of the following: bitmap, cell index, resource index, number of combinations, transmission configuration indication (TCI) status, and channel state information (CSI) measurement indication information, instructing the user equipment to perform CSI measurement on the reference signal of the candidate cell.

129. The wireless communication method according to claim 128, wherein, After the channel measurement indication information is sent to the user equipment, some or all candidate cells begin to be measured by the user equipment for CSI, or based on a specific point in time, some or all candidate cells begin to be measured by the user equipment for CSI.

130. The wireless communication method according to claim 128 or 129, wherein, The channel measurement reference signal is transmitted by the candidate cell or by the serving cell respectively.

131. The wireless communication method according to any one of claims 128 to 130, wherein, The CSI measurement includes at least one of the following: Layer 1 Reference Signal Received Power (L1-RSRP) and Layer 1 Signal-to-Interference-Ratio (L1-SINR).

132. The wireless communication method according to any one of claims 128 to 131, wherein, After sending a cell handover command to the user equipment, the target cell receives the CSI measurement results reported by the user equipment.

133. A wireless communication device, comprising: A processor and a memory, the memory for storing a computer program, the processor for calling and running the computer program stored in the memory to perform the wireless communication method as described in any one of claims 1 to 132.

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