Channel state information reporting methods, base station, user equipment, storage medium, electronic apparatus and computer program product

Abstract

Provided in the embodiments of the present disclosure are channel state information reporting methods, a base station, a user equipment (UE), a storage medium, an electronic apparatus and a computer program product. A method is applied to a network side and comprises: sending to a UE, by means of signaling, a reference signal configuration and a reporting configuration corresponding to the reference signal configuration, wherein the reporting configuration comprises a first reporting type, a second reporting type and a first instruction, the first instruction being used for instructing the UE to use the first reporting type to report channel state information or use the second reporting type to report channel state information. The method at least solves the problem in the related art of a feedback mechanism causing an increase in the amount of feedback information, resulting in high feedback overheads.

Description

Channel state information reporting methods, base stations, user terminals, storage media, electronic devices, and computer program products

[0001] Cross-references to related applications

[0002] This disclosure is based on and claims priority to Chinese patent application CN202510321827.0, filed on March 18, 2025, entitled “Method for Reporting Channel State Information, Base Station, User Terminal, Storage Medium, Electronic Device and Computer Program Product”, and incorporates the entire contents of that patent application by reference. Technical Field

[0003] This disclosure relates to the field of communications, and more specifically, to a method for reporting channel state information, a base station, a user terminal, a storage medium, an electronic device, and a computer program product. Background Technology

[0004] In wireless communication systems, the transmitting and receiving ends are typically configured with multiple antennas to form a distributed multiple-input multiple-output (MIMO) system, utilizing spatial multiplexing technology to improve transmission rates. Depending on whether the base station antennas are deployed in the same area, MIMO transmission is divided into centralized and distributed types. Distributed MIMO utilizes transmission and reception points (TRPs) in different geographical locations to serve user equipment (UE), shortening the distance between the UE and the TRPs and providing a more uniform quality of service. Simultaneously, coordinated transmission between TRPs can better suppress interference and improve spectrum efficiency. Compared to centralized MIMO systems, distributed MIMO provides a more uniform and stable quality of service.

[0005] To ensure performance gains, distributed transmitting nodes need to acquire Channel State Information (CSI) to calculate precoding vectors, thereby enhancing signal quality and suppressing interference. Transmitting nodes typically obtain CSI from receiver feedback; the accuracy and real-time nature of this feedback have a significant impact on system performance.

[0006] However, when the receiving node is in a mobile state, the Doppler effect causes the signal to change in the time dimension. Compared with centralized MIMO, the transmitting node of distributed MIMO is located in different locations of the receiving node, and the signal changes more drastically over time. In order to ensure the efficiency and accuracy of communication, the receiving node needs to measure the channel state more frequently and feed it back to the transmitting node, which leads to an increase in the amount of feedback information and thus increases the feedback overhead. Summary of the Invention

[0007] This disclosure provides a method for reporting channel state information, a base station, a user terminal, a storage medium, an electronic device, and a computer program product to at least address the problem of increased feedback information and high feedback overhead caused by feedback mechanisms in related technologies.

[0008] According to an embodiment of this disclosure, a method for reporting channel state information is provided, applied on the network side, including:

[0009] The reference signal configuration and the corresponding reporting configuration are sent to the user terminal UE via signaling. The reporting configuration includes a first reporting type, a second reporting type and a first indication. The first indication is used to instruct the UE to report channel state information using the first reporting type or the second reporting type.

[0010] According to another embodiment of this disclosure, a method for reporting channel state information is provided, applied to a UE, comprising:

[0011] The UE receives a reference signal configuration and a corresponding reporting configuration sent by the network side via signaling. The reporting configuration includes a first reporting type, a second reporting type, and a first indication. The first indication is used to instruct the UE to report channel state information using the first reporting type or the second reporting type.

[0012] According to yet another embodiment of this disclosure, a base station is also provided for implementing the steps in any of the above method embodiments.

[0013] According to yet another embodiment of this disclosure, a user terminal is also provided for implementing the steps in any of the above method embodiments.

[0014] According to yet another embodiment of this disclosure, a computer-readable storage medium is also provided, wherein a computer program is stored therein, wherein the computer program is configured to perform the steps in any of the above method embodiments when it is run.

[0015] According to yet another embodiment of this disclosure, an electronic device is also provided, including a memory and a processor, wherein the memory stores a computer program and the processor is configured to run the computer program to perform the steps in any of the above method embodiments.

[0016] According to yet another embodiment of this disclosure, a computer program product is also provided, including a computer program that, when executed by a processor, implements the steps in any of the above method embodiments. Attached Figure Description

[0017] Figure 1 is a schematic diagram of multi-TRP CJT transmission according to an embodiment of the present disclosure;

[0018] Figure 2 is a hardware structure block diagram of the mobile terminal operating in the embodiments of the method disclosed herein;

[0019] Figure 3 is a flowchart of a channel state information reporting method according to an embodiment of the present disclosure;

[0020] Figure 4 is a flowchart of a channel state information reporting method according to an embodiment of the present disclosure;

[0021] Figure 5 is a schematic diagram of the reporting time of the reporting type according to an embodiment of the present disclosure;

[0022] Figure 6 is a structural block diagram of an electronic device according to an embodiment of the present disclosure. Detailed Implementation

[0023] The embodiments of this disclosure will be described in detail below with reference to the accompanying drawings and examples.

[0024] It should be noted that the terms "first," "second," etc., in the specification, claims, and drawings of this disclosure are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence.

[0025] First, the technical terms used in the embodiments of this disclosure will be explained:

[0026] A global channel refers to the set of all communication paths between transmitters and receivers, which can be represented by a complex matrix H. Each row of this matrix can represent a transmitter (TRP), and each column can represent a receiver antenna of a receiver (UE).

[0027] When performing singular value decomposition (SVD) on the global channel matrix H, H can be represented as H = UDV^H, where U and V are two sets of orthogonal vectors, referred to as the left singular vector and the right singular vector, respectively, and D is a diagonal matrix containing the singular values ​​of H.

[0028] The right singular vector V is a complex matrix whose column vectors represent the optimal solution space of the receiving UE when receiving signals. These vectors can indicate how best the UE should decode the signal and whether the signal transmission direction is advantageous to the UE.

[0029] The precoding vector W is typically calculated based on the right singular vector V of H. W can be a subset or variation of V, depending on the system configuration (such as the number of transmission layers, codebook selection, etc.). The purpose of precoding is to process the signal at the transmitting end to enhance the signal transmission efficiency by utilizing the characteristics of the channel.

[0030] In the 5G NR Release 18 protocol, for Coherent Joint Transmission (CJT) mode, the base station needs to determine the number of data layers, modulation scheme, and precoding vector based on channel state information. In the 5G NR standard specification, the channel state information obtained by the base station is mainly based on reports from the UE, and its basic principle is briefly described below:

[0031] For example, Figure 1 is a schematic diagram of multi-TRP CJT transmission according to an embodiment of the present disclosure. As shown in Figure 1, K TRPs in the network serve the UE in CJT mode. It is assumed that the k-th TRP has N k There are [number] antenna ports, and all transmitting nodes have a total of [number] antenna ports. With M antenna ports, and the UE having M antenna ports, the downlink channel matrix of the entire distributed system can be represented as follows: in This represents the downlink channel matrix formed by the k-th TRP and the UE.

[0032] To obtain channel state information, each TRP can transmit downlink reference signals, and the UE can receive and measure the reference signals of each TRP to obtain the channel state information H. k By concatenating k channel state information entries together, the global channel state information H can be obtained. The 5G NR Release 18 protocol stipulates that the base station and the UE share a single codebook {c1,c2,...,c...}. B The UE can determine the data transmission layer rank according to specific criteria and select specific codewords from the codebook as recommended precoding vectors, reporting this to the base station via a Precoding Matrix Indicator (PMI). Simultaneously, the UE can combine interference measurement information and assume the base station uses the codewords indicated by the PMI as precoding vectors to calculate the Signal-to-Interference-Noise Ratio (SINR), further converting it into CQI and feeding it back to the base station.

[0033] In the PMI codebook specified in Release 18, the basic unit of a codeword has the following form:

[0034] Among them, the above

[0035] Let n = 1, 2, ..., N0 represent the precoding vector corresponding to the nth selected CSI-RS resource. In a practical system, this can be equivalent to the precoding vector of the corresponding TRP. Therefore, the feedback overhead of the current scheme increases exponentially with the number of TRPs. Furthermore, the current codebook assumes that each CSI-RS resource has the same number of CSI-RS ports, limiting the flexibility of TRP cooperative transmission. Future networks will support larger-scale TRP cooperative transmission, requiring timely and accurate channel state information feedback. Reducing feedback overhead is crucial for improving network performance.

[0036] In wireless communication, the channel state is determined by the physical environment, including but not limited to obstacles, multipath effects, and Doppler shift. When these conditions change, the global channel matrix H changes accordingly, and consequently, the right singular vector V also changes. Because these changes are non-linear, there is no direct mathematical relationship between the historical V and the new H, making it impractical to directly use the historical V to calculate the new V. This is because Singular Value Decomposition (SVD) is a matrix-based mathematical operation that requires the input matrix H to accurately reflect the current channel state. If H changes, directly using the old V to predict the new V will lead to inaccurate precoding vectors, thus affecting the quality and efficiency of data transmission.

[0037] Utilizing historical information directly can reduce computational and feedback overhead. However, directly calculating the right singular vector V based on the new global channel H may introduce the following problems:

[0038] High feedback overhead: Every time the channel state changes, the UE needs to remeasure the channels of all TRPs, calculate the new H, and feed it back to the base station. This is particularly problematic in distributed MIMO systems because the TRPs may be widely distributed, leading to time-consuming measurement and feedback processes with high bandwidth consumption.

[0039] High computational complexity: Recalculating the SVD of H requires significant computational resources, especially when H is large or changes frequently. This not only increases the computational burden on the base station but may also limit the system's real-time performance, as processing these calculations can be time-consuming.

[0040] Real-time issues: If the channel state changes faster than the system response time, directly calculating V based on the new H may cause the precoding strategy to lag behind the actual channel conditions, affecting the performance of data transmission.

[0041] This disclosure proposes a method for reporting channel state information, which can address the following technical problems:

[0042] 1) When the receiving node is in motion, the Doppler effect causes changes in the signal over time. Compared to centralized MIMO, distributed MIMO has transmitting nodes located at different locations from the receiving node, resulting in more drastic changes in the signal over time. This places higher demands on the timeliness of channel state information feedback and the control of feedback overhead.

[0043] For example, high-speed movement of the UE can lead to Doppler shift and rapid time-varying channel characteristics, meaning that channel conditions can change significantly in a short period of time. To maintain efficient and accurate communication, the UE needs to measure the channel state more frequently and feed it back to the base station so that the base station can update the precoding vector in a timely manner to adapt to channel changes. This more frequent CSI feedback requirement, as well as the dynamic changes in channel state in space and time, directly leads to an increase in the amount of feedback information, thereby increasing feedback overhead.

[0044] 2) Receiving nodes typically feed back the right singular vector of the global channel as part of the channel state information. If the Doppler effect renders some transmitting nodes unsuitable for data transmission at a certain moment (e.g., if relative motion between a transmitting node and the UE causes channel quality degradation, and that node continues to use outdated CSI for data transmission, it may suffer from a higher bit error rate and / or a lower data rate. In some cases, this channel change may make the signals of some transmitting nodes unreliable, thus making them unsuitable for data transmission at a certain moment), it is necessary to recalculate the right singular vector corresponding to the new global channel, making it impossible to effectively utilize historical information to achieve feedback overhead compression.

[0045] For example, taking 3 transmitting nodes as an example, the global channel is H = [H1, H2, H3], and the right singular vector can be represented as: If only nodes 1 and 3 are selected to send data at a certain moment, then the updated right singular vector V new Based on H new =[H1,H3] calculations cannot be based on historical information. get.

[0046] To address the aforementioned technical problems, this disclosure proposes a reporting mechanism that combines a first reporting type and a second reporting type on the network side with a reporting mechanism on the UE side. This at least solves the problem of increased feedback information and high feedback overhead caused by the feedback mechanism in related technologies, reduces feedback overhead, and improves the flexibility and efficiency of CSI reporting.

[0047] The method embodiments provided in this disclosure can be executed in a mobile terminal, computer terminal, or similar computing device. Taking running on a mobile terminal as an example, FIG2 is a hardware structure block diagram of a mobile terminal running in the method embodiments of this disclosure. As shown in FIG2, the mobile terminal may include one or more (only one is shown in FIG2) processors 202 (processor 202 may include, but is not limited to, processing devices such as microprocessors MCUs or programmable logic devices FPGAs) and a memory 204 for storing data. The mobile terminal may also include a transmission device 206 for communication functions and an input / output device 208. Those skilled in the art will understand that the structure shown in FIG2 is only illustrative and does not limit the structure of the mobile terminal. For example, the mobile terminal may also include more or fewer components than shown in FIG2, or have a different configuration than shown in FIG2.

[0048] The memory 204 can be used to store computer programs, such as application software programs and modules, like the computer program corresponding to the channel state information reporting method in this embodiment. The processor 202 executes various functional applications and data processing by running the computer program stored in the memory 204, thereby implementing the above-described method. The memory 204 may include high-speed random access memory, and may also include non-volatile memory, such as one or more magnetic storage devices, flash memory, or other non-volatile solid-state memory. In some instances, the memory 204 may further include memory remotely located relative to the processor 202, and these remote memories can be connected to the mobile terminal via a network. Examples of such networks include, but are not limited to, the Internet, corporate intranets, local area networks, mobile communication networks, and combinations thereof.

[0049] The transmission device 206 is used to receive or send data via a network. Specific examples of the network described above may include a wireless network provided by the mobile terminal's communication provider. In one example, the transmission device 206 includes a Network Interface Controller (NIC), which can connect to other network devices via a base station to communicate with the Internet. In another example, the transmission device 206 may be a Radio Frequency (RF) module used for wireless communication with the Internet.

[0050] This disclosure provides a method for reporting channel state information on a mobile terminal or base station as described above. Figure 3 is a flowchart of the channel state information reporting method according to an embodiment of this disclosure. As shown in Figure 3, it can be applied to the network side, and the process may include the following steps:

[0051] Step S301: Send a reference signal configuration and a reporting configuration corresponding to the reference signal configuration to the user terminal UE via signaling; the reporting configuration includes a first reporting type, a second reporting type and a first indication, wherein the first indication is used to instruct the UE to report channel state information using the first reporting type or to report channel state information using the second reporting type.

[0052] In the embodiments of this disclosure, the reporting type can refer to the reporting method, or the feedback type or feedback method. Hereinafter, the term "reporting type" will be used to describe the channel state information reporting method of this disclosure.

[0053] For example, the reference signal configuration and the corresponding reporting configuration can be sent by the network side through two separate signaling signals. This embodiment of the present disclosure does not restrict the order in which the reference signal configuration and the corresponding reporting configuration are sent.

[0054] For example, the network side can send the pre-configured reference signal configuration and the corresponding reporting configuration to the UE via signaling, so that the UE can report channel state information using the corresponding reporting type based on the reporting type and the first indication in the reporting configuration.

[0055] As an example, the first reporting type and the second reporting type can be reporting types with different reporting times or different reporting intervals.

[0056] Through the above steps, at least the problem of increased feedback information and high feedback overhead caused by the feedback mechanism in related technologies has been solved, the feedback overhead has been reduced, and the flexibility and efficiency of CSI reporting have been improved.

[0057] The entity performing step S301 can be a transmitting node, a base station, etc., but is not limited to these.

[0058] In one exemplary embodiment, the reference signal configuration includes at least one of the following:

[0059] Multiple Channel State Information Measurement Reference Signal (CSI-RS) resources, wherein each CSI-RS resource includes at least one CSI-RS port;

[0060] A CSI-RS resource, wherein the CSI-RS resource includes a CSI-RS port group, and the CSI-RS port group includes multiple CSI-RS port subgroups.

[0061] As an example, the network side (such as the base station) can configure multiple CSI-RS resources and / or one CSI-RS resource for the UE.

[0062] As an example, in a distributed MIMO system, multiple TRPs may be located in different geographical areas, and each TRP may have different antenna configurations, transmit power, and frequencies. In order to accurately grasp the channel characteristics between each TRP and the UE (User Equipment), it is necessary to send independent CSI-RS from each TRP so that the UE can perform independent measurements. Therefore, the network side can configure multiple independent CSI-RS resources for the UE.

[0063] For multiple independently configured CSI-RS resources, each CSI-RS resource can include one or more CSI-RS ports. Each CSI-RS port can transmit a specific reference signal. By receiving and measuring the specific reference signal, the UE can independently evaluate the channel state between each TRP (Transmitter Receiver Point) and the UE. This configuration method is suitable for scenarios with a large number of TRPs, and where the characteristics of each TRP (such as antenna configuration, location, etc.) are significantly different. By configuring CSI-RS resources individually, the UE can perform accurate channel measurements for each TRP, thereby providing more detailed CSI information to optimize the MIMO transmission strategy for multiple TRPs.

[0064] As an example, in scenarios where the number of TRP antenna ports varies but the channel state change trend and rate are relatively consistent for each TRP, such as in relatively static or low-speed mobile environments, the network can configure fewer CSI-RS ports to reduce feedback overhead while ensuring the accuracy of channel state information. For example, the network side can configure a CSI-RS resource that includes multiple ports for the UE.

[0065] For a configured CSI-RS resource, this resource can include a CSI-RS port group, which can include multiple ports. These ports can be further divided into multiple CSI-RS port subgroups, each corresponding to a different TRP or a different antenna configuration of that TRP. This configuration allows the UE to receive reference signals from multiple TRPs simultaneously in a single measurement, reducing the number of measurements and feedback steps and thus lowering overall overhead. This configuration is suitable for scenarios where the number of TRP ports varies, with each TRP potentially having a different number of antenna ports. In this case, the network can use signaling to indicate the precise number of ports in each CSI-RS port subgroup, enabling the UE to accurately perform channel estimation while taking into account the differences in antenna configurations across different TRPs.

[0066] In one exemplary embodiment, after sending the reference signal configuration and the corresponding reporting configuration to the user terminal UE via signaling, the method further includes:

[0067] Send CSI-RS to the UE;

[0068] The system receives channel state information reported by the UE according to the first reporting type or the second reporting type based on the CSI-RS and the first indication; the channel state information includes at least one of the following: precoding indication (PMI), channel quality indication (CQI), and rank indication (RI).

[0069] In this exemplary embodiment, the reporting type adopted by the UE can be determined by the network side. For example, the network side can send CSI-RS to the UE for the UE to perform channel measurements and obtain corresponding channel state information. The UE can report the measured channel state information using the corresponding reporting type based on the reporting type and the first indication in the reporting configuration. For instance, the UE can measure and report the channel state information corresponding to the first reporting type based on the indication to report channel state information using the first reporting type, or the UE can measure and report the channel state information corresponding to the second reporting type based on the indication to report channel state information using the second reporting type.

[0070] For example, channel state information may include at least one of the following: Precoding Matrix Indicator (PMI), Channel Quality Indicator (CQI), Rank Indicator (RI), etc.

[0071] In one exemplary embodiment, after sending the reference signal configuration and the corresponding reporting configuration to the user terminal UE via signaling, the method further includes:

[0072] Send CSI-RS to the UE;

[0073] The network receives a second indication reported by the UE, the second indication being used to instruct the UE on the network side to report channel status information using either the first reporting type or the second reporting type.

[0074] In this exemplary embodiment, the reporting type adopted by the UE can be determined by the UE based on the channel measurement results. For example, the UE can measure the CSI-RS sent by the network side to obtain the channel measurement results, and can determine whether to adopt a first reporting type or a second reporting type based on the channel measurement results, and generate a corresponding second indication to indicate the selected reporting type to the network side.

[0075] In one exemplary embodiment, the reporting time of the first reporting type is the first reporting time, and the reporting time of the second reporting type is the second reporting time; the reporting period interval configured for the first reporting type is greater than or equal to the reporting period interval configured for the second reporting type.

[0076] For example, the reporting configuration in this embodiment of the disclosure also configures a corresponding reporting time (also known as a feedback time) for each reporting type. The reporting time can refer to the time when the UE performs CSI measurement and reporting. As an example, the reporting configuration can include an indication of when the UE performs CSI information measurement and reporting. The network side can instruct the UE when to perform CSI measurement and reporting through signaling.

[0077] In this embodiment of the disclosure, the reporting time configured in the reporting configuration can be periodic or non-periodic (i.e., it does not follow a fixed, regular time interval, such as event-triggered or semi-continuous).

[0078] In one embodiment, the network side can also configure non-periodic reporting times for the UE. For example, the network side can inform the UE to report CSI at specific non-periodic times via signaling based on dynamic factors such as UE mobility, channel estimation uncertainty, and data transmission requirements. This dynamic feedback time configuration allows the network side to more flexibly adjust resource allocation and precoding strategies to adapt to the constantly changing wireless environment.

[0079] In another embodiment, the network side can configure the UE to report periodically. For example, the UE performs a CSI measurement and reports at fixed time intervals.

[0080] As an example, when the reporting time is configured as a periodic reporting time, the reporting period interval configured for the first reporting type is greater than or equal to the reporting period interval configured for the second reporting type. Here, the reporting period interval can refer to the time length between two consecutive CSI feedback responses in a periodic CSI feedback mechanism. It should be noted that the reporting period interval in this embodiment is not limited to a fixed length; the network side can configure a more flexible feedback period interval, making it greater than or equal to a certain basic time unit to adapt to the needs of different scenarios.

[0081] For example, the network side can configure a reporting pattern like "First Reporting Type - Second Reporting Type - First Reporting Type - Second Reporting Type". The first reporting type can be configured with a longer reporting interval to obtain detailed CSI information, while the second reporting type can be configured with a relatively shorter reporting interval to capture real-time channel changes, such as change indicators or updates to certain parameters. Even if the reporting intervals for the first and second reporting types are the same, the second reporting type appearing between two first reporting types can significantly reduce the overall feedback overhead. This is because the second reporting type can utilize historical information from the first reporting types, only reporting the changed channel information, thus avoiding the repeated transmission of the same complete CSI information.

[0082] In one exemplary embodiment, the PMI corresponding to the second reporting type is jointly determined by the channel state information reported using the first reporting type and the channel state information reported using the second reporting type.

[0083] In one exemplary embodiment, the PMI corresponding to the second reporting type is jointly determined by the channel state information reported using the first reporting type and the channel state information reported using the second reporting type; wherein, the first reporting type is the reporting type whose reporting time is closest to the reporting time of the second reporting type.

[0084] In an exemplary embodiment, the PMI corresponding to the second reporting type is determined by the channel state information reported using the first reporting type, the channel state information reported using the second reporting type, and a third indication; the third indication is an indication that instructs the UE on the network side to select the CSI-RS resource or the CSI-RS port subgroup using the second reporting type.

[0085] In this embodiment, the Channel State Information (PMI) can be jointly determined by combining the channel state information reported using the first reporting type and the second reporting type, thus optimizing the CSI reporting mechanism. This mechanism not only reduces feedback overhead and improves resource utilization efficiency, but also ensures that the precoding vector can reflect the channel state in a timely and accurate manner under changing communication environments. This plays a crucial role in improving the overall performance of the distributed MIMO system and the communication experience of the UE.

[0086] In an exemplary embodiment, when the UE reports the channel state information using the second reporting type, the channel state information reported by the UE includes a channel quality indicator (CQI); wherein the CQI is calculated by the UE under the condition that the network side performs precoding based on the PMI corresponding to the second reporting type.

[0087] For example, when the UE reports channel state information using the second reporting type, if the channel state information corresponding to the second reporting type includes CQI, then the network-side precoding vector should be assumed to be PMI when calculating the CQI. That is, when the UE executes the second reporting type, the CQI can be calculated based on the PMI known on the network side. This means that when the UE calculates the CQI, it assumes that the precoding vector used by the network side is consistent with the previously fed-out PMI, thus reflecting the channel quality under this precoding condition.

[0088] In distributed MIMO systems, the accuracy and real-time performance of CQI play a decisive role in improving spectral efficiency and communication quality. By including CQI calculated based on PMI in the channel state information reported using the second reporting type, the UE can quickly respond to real-time changes in the channel, thereby helping the network side to adjust transmission parameters in a timely manner to cope with fluctuations in channel state, especially rapid changes caused by the Doppler effect.

[0089] For example, by reporting only the CQI in the channel state information reported using the second reporting type, the UE avoids repeatedly sending complete CSI information (including PMI, CQI, and RI), which is especially important when the channel state is relatively stable. Since CQI calculation depends on the known PMI, this reporting mechanism can effectively utilize historical information, reduce the frequency and overhead of CSI reporting, and maintain high communication performance.

[0090] For example, after receiving the channel state information corresponding to the second reporting type reported by the UE, the network side can use a known PMI (such as the channel state information reported based on the first reporting type that is closest to the current second reporting time) to decode the CQI. Based on the CQI value, the network side can perform rapid resource allocation and power control adjustments to adapt to the channel quality changes reported by the UE, ensuring that the optimal transmission strategy is maintained under changing channel conditions.

[0091] In one exemplary embodiment, the channel state information reported using the first reporting type includes at least one of the following:

[0092] RI, the first PMI corresponding to the first reporting type, The The corresponding CSI-RS resource or the CSI-RS port group indication; wherein, the for A matrix with L rows and L columns, This indicates the number of ports in the CSI-RS resource corresponding to the first reporting type. N represents the total number of ports in the reference signal configuration, L represents the number of layers for data transmission, and L ≥ RI; the first PMI is the... The first RI column; or,

[0093] RI, the second PMI corresponding to the first reporting type, U L×L and stated Wherein, the U L×L It is an L-row L-column matrix; the second PMI is the... The first RI column; or,

[0094] RI, the third PMI corresponding to the first reporting type, The The corresponding CSI-RS resource or the CSI-RS port group indication; wherein, the For the first reporting type A matrix of rows RI and columns, the for OK downlink channel matrix of columns, This indicates the number of receive antenna ports corresponding to the CSI-RS measurement performed by the UE using the first reporting type. M is the total number of receive antenna ports when the UE performs CSI-RS measurements; the third PMI is... or,

[0095] The

[0096] In this embodiment, the RI determines the number of precoding vectors in the PMI, i.e., how many independent precoding vectors the network can use to transmit data. This is determined by the UE based on channel quality assessment. The network adjusts the number of layers and precoding method of the data stream based on the RI and PMI to match the current channel conditions.

[0097] For example, for the reported content being RI, the first PMI corresponding to the first reporting type, Indication of the corresponding CSI-RS resource or CSI-RS port group:

[0098] (Hereinafter referred to as the V matrix) can be a A matrix of rows and columns L, where, This matrix represents the number of ports in the CSI-RS resources communicating with the UE, where L can be the number of layers transmitting data. This matrix provides detailed information about how the channel affects the received signal. In long-term feedback, the UE feeds back the first RI columns of the V matrix, from which the network can extract the optimal precoding vector.

[0099] The first RI columns of the V matrix can be directly used to generate the first PMI; these column vectors represent the optimal solution space as perceived by the UE. The network side can determine the specific form of the precoding matrix based on these column vectors to ensure that the signal achieves optimal decoding performance upon arrival at the UE.

[0100] L≥RI indicates that the number of basis vectors used to represent the channel in the frequency domain is greater than or equal to the recommended transmission layer number RI for reporting. This provides richer frequency domain information, allowing the use of these additional basis vectors to more accurately describe the frequency domain changes of the channel when using the second reporting type, even when RI remains constant. For example, for a transmission with RI=2, if L is set to 8, six additional frequency domain basis vectors can be used to refine the frequency domain description of the channel, thus more accurately reflecting instantaneous changes in the channel when reporting using the second reporting type.

[0101] For example, for the reported content being RI, the second PMI corresponding to the first reporting type, and U L×L and

[0102] Feedback U L×L Matrix-based communication enhances the network's comprehensive understanding of the channel, especially in multi-TRP cooperative transmission where the network needs to consider the interactions between different transmitters. The network can utilize the U matrix to optimize precoding strategies, such as selecting which TRPs participate in data transmission and adjusting precoding vectors to suit the characteristics of the transmitters, thereby improving data transmission stability and efficiency. By simultaneously feeding back the U and V matrices, the network can reconstruct the complete downlink channel matrix H, since H = UDV^H, where D is a diagonal matrix containing the channel's singular values. This complete channel state information allows the network to perform more granular resource allocation and scheduling, as well as precoding optimization, thereby improving spectral efficiency and user experience.

[0103] For example, for the reported content being RI, the third PMI corresponding to the first reporting type, Indication of the corresponding CSI-RS resource or CSI-RS port group:

[0104] (Hereinafter referred to as matrix A) can be A matrix of rows RI columns, where This can represent the number of receive antenna ports selected by the UE when performing CSI-RS measurements, and satisfies... M can be the total number of receive antenna ports when the UE performs CSI-RS measurements. The A matrix reflects how the UE receives and processes signals received from different TRPs (Transmitter Receiver Points). It can be a quantized representation based on the measured received signal strength or quality, or it can be a set of basis vectors calculated using a specific algorithm for precoding. The A matrix can provide a description of the UE's reception characteristics, allowing the network to optimize precoding strategies accordingly.

[0105] (Hereinafter referred to as the H matrix) can be OK The downlink channel matrix of columns, where This can represent the number of ports in the CSI-RS resources used for communication with the UE. This can represent the number of receive antenna ports selected by the UE when performing CSI-RS measurements. The H matrix is ​​the core description of the channel state; it reflects the complex gain characteristics of the channel, i.e., the signal gain from... Each transmitting antenna port to The transmission characteristics of each receiver antenna port. The H matrix is ​​a key part of the network side's singular value decomposition (SVD) to extract the precoding matrix.

[0106] Indications of CSI-RS resources or CSI-RS port groups can be used to identify the specific components of the CSI-RS received by the UE. In a distributed MIMO system, multiple TRPs can be configured with different CSI-RS resources, each containing a different number of ports. Therefore, the UE needs to explicitly indicate which CSI-RS resources or port groups are used to generate the A and H matrices so that the network side can correctly understand the source and scope of the feedback information.

[0107] For example, for the reported content is

[0108] Reporting only Compared to feedback schemes that include information such as RI, PMI, and U, this significantly reduces the amount of feedback information. This streamlined feedback mechanism is applicable to distributed MIMO or coherent joint transmission (CJT) systems. When channel state information changes relatively slowly and the network side has strong processing capabilities, it can reduce the feedback burden on the UE, lower feedback latency, and improve the overall system performance.

[0109] It should be noted that only reporting is required. This means that the network side needs to decide for itself how to extract precoding vectors from the H matrix and determine the RI. This flexibility allows the network side to dynamically adjust the precoding strategy and the number of data transmission layers according to more complex and real-time environmental changes, in order to adapt to changes in channel quality, such as Doppler shift and multipath effects, thereby improving the stability and efficiency of data transmission.

[0110] In one exemplary embodiment, the channel state information reported using the second reporting type includes at least one of the following:

[0111] RI, the fourth PMI and B corresponding to the second reporting type L×RI ; wherein, the B L×RI The matrix consists of L rows and RI columns corresponding to the second reporting type; the fourth PMI is V1B. L×RI V1 is the first reporting type that was reported using the reporting time closest to the current reporting time of the second reporting type. Matrix, or based on multiple historical reporting records of the first reporting type. The matrix obtained from the matrix; or,

[0112] RI, the fifth PMI corresponding to the second reporting type, and the B L×RI The fifth PMI is V1B. L×RI Or V1U1B L×RI Where V1 and U1 are respectively the reports submitted using the first reporting type that are closest to the current reporting time of the second reporting type. The matrix and the U reported using the first reporting type that is closest to the current reporting time of the second reporting type. L×L Matrix, or respectively based on multiple historical reporting records of the first reporting type. The matrix obtained from the matrix and the multiple U values ​​in the historical reporting records according to the first reporting type L×L The matrix obtained from the matrix; or,

[0113] RI, the sixth PMI corresponding to the second reporting type and Among them, the For the second reporting type A matrix of rows and columns, wherein the sixth PMI is H1 is the report submitted using the first reporting type, which is closest to the current reporting time of the second reporting type. Matrix, or multiple historical reporting records based on the first reporting type. The resulting matrix; or,

[0114] The or,

[0115] RI, the seventh PMI corresponding to the second reporting type, and the B L×RI The third indication; the third indication is used to instruct the UE on the network side to use the CSI-RS resource or the CSI-RS port subgroup selected by the second reporting type; the seventh PMI is V2B. L×RI or V2U2B L×RI V2 is the CSI-RS resource or CSI-RS port subgroup indicated by the third indication, from V1. The N1-row matrix determined in the row matrix, U2 is the L1-row matrix determined from the L-row matrix of U1, where L1 ≤ L, based on the CSI-RS resource or CSI-RS port subgroup indicated by the third indication; or,

[0116] RI, the eighth PMI corresponding to the second reporting type, the The third instruction; the eighth PMI is H2 is the CSI-RS resource or CSI-RS port subgroup indicated by the third indication, from H1. The N1-row matrix determined in the row matrix,

[0117] In this embodiment of the disclosure, RI can represent the maximum number of independent data streams that the UE recommends can be reliably transmitted simultaneously. In reporting using the second reporting type, the RI can differ from the RI reported using the first reporting type; reporting using the second reporting type can reflect the impact of dynamic channel changes over time on the number of data transmission layers.

[0118] For example, for the reported content being RI, the fourth PMI and B corresponding to the second reporting type L×RI The PMI corresponding to the second reporting type is Or the reported content is RI, the fifth PMI and B corresponding to the second reporting type. L×RI The fifth PMI is or

[0119] The fourth or fifth PMI can be a quantized indication of the precoding vector recommended by the UE to the network side based on the channel state. In reporting using the second reporting type, the PMI can be multiplied... or To determine, where V1 can be the first reporting type reported using the reporting time closest to the current reporting time of the second reporting type. Matrix U1 can be the first reporting type reported using the time closest to the current reporting time of the second reporting type. L×L The matrix, or V1, can be multiple historical reporting records based on the first reporting type. The matrix obtained from the matrix, U1, can be multiple U values ​​from the historical reporting records of the first reporting type. L×L The matrix obtained from the matrix.

[0120] That is, the fourth or fifth PMI corresponding to the second reporting type in this embodiment is calculated based on historical channel state information and combined with the instantaneous changes of the current channel. This helps to effectively utilize historical information, reduce feedback overhead, and maintain the real-time and accuracy of channel state information.

[0121] B L×RI This can be an L-row, RI-column matrix, where L represents the number of data transmission layers, and RI can be the currently recommended number of data transmission layers. B L×RI The matrix can reflect instantaneous changes in the channel relative to the most recent report using the first reporting type, such as changes caused by the Doppler effect or environmental variations. The UE calculates B by measuring the changes in the channel matrix H. L×RI The matrix is ​​then reported to the network side as part of the second reporting type. B L×RI Matrix and History When used in combination, matrices can generate new PMIs to guide the network side on how to update precoding strategies to adapt to instantaneous changes in the channel.

[0122] For example, for the reported content being RI, the sixth PMI corresponding to the second reporting type and

[0123] It is A matrix of rows RI columns, where This indicates the number of receiver antenna ports when the UE performs CSI-RS measurements, and RI is the recommended number of transmission layers for the UE. The matrix reflects changes in the channel state relative to the last long-time feedback time, including but not limited to instantaneous channel gain changes caused by the Doppler effect, environmental changes, or interference. The UE can obtain this information through measurement. The matrix is ​​then reported to the network side as part of the content reported using the second reporting type.

[0124] In reporting using the second reporting type The matrix captures instantaneous changes in the channel, and the network side uses historical channel matrices... and Matrix multiplication yields an updated precoding matrix that takes into account the impact of channel variations on the precoding vector, thereby adjusting the precoding strategy to adapt to instantaneous channel conditions.

[0125] For example, for the reported content is That is, the content reported using the second reporting type only includes This matrix significantly reduces the amount of feedback information and lowers the overhead of the feedback process, including computational resources and transmission bandwidth. Simultaneously, this mechanism allows the network side to control feedback costs while rapidly responding to channel changes and adjusting precoding vectors to ensure data transmission stability and efficiency. Especially in scenarios with rapid UE movement or significant Doppler shift, the low overhead and rapid response capabilities of the second reporting type are crucial for maintaining high-quality communication.

[0126] For example, for the reported content being RI, the seventh PMI corresponding to the second reporting type, and the B L×RI Third indication: The seventh PMI can be based on a specific matrix V2 obtained from the historical V matrix and / or a specific matrix U2 obtained from the historical U matrix, as well as B. L×RI Further calculations reveal that the UE can select a specific CSI-RS resource or CSI-RS port subgroup based on the measurement results and generate a corresponding third indication. The UE can determine V2 from matrix V1 and / or U2 from U1 based on the selected CSI-RS resource or CSI-RS port subgroup.

[0127] For example, for the reported content being RI, the eighth PMI corresponding to the second reporting type, Third indication: The eighth PMI can be based on a specific matrix H2 obtained from the historical H matrix, and Calculations show that the UE can select a specific CSI-RS resource or CSI-RS port subgroup based on the measurement results and generate a corresponding third indication. The UE can determine H2 from matrix H1 based on the selected CSI-RS resource or CSI-RS port subgroup.

[0128] In another embodiment of this disclosure, a method for reporting channel state information that can be run on the aforementioned mobile terminal is provided. Figure 4 is a flowchart of the method for reporting channel state information according to an embodiment of this disclosure. As shown in Figure 4, it can be applied to a UE, and the process may include the following steps:

[0129] Step S401: Receive the reference signal configuration and the corresponding reporting configuration sent by the network side via signaling; the reporting configuration includes a first reporting type, a second reporting type and a first indication, the first indication being used to instruct the UE to report channel state information using the first reporting type or using the second reporting type.

[0130] In the embodiments of this disclosure, the reporting type can refer to the reporting method, or the feedback type or feedback method. Hereinafter, the term "reporting type" will be used to describe the channel state information reporting method of this disclosure.

[0131] For example, the reference signal configuration and the corresponding reporting configuration can be sent by the network side through two separate signaling signals. This embodiment of the present disclosure does not restrict the order in which the reference signal configuration and the corresponding reporting configuration are sent.

[0132] For example, the UE can receive the reference signal configuration and the corresponding reporting configuration sent by the network side through signaling, and report the channel state information using the corresponding reporting type based on the reporting type and the first indication in the reporting configuration.

[0133] As an example, the first reporting type and the second reporting type can be reporting types with different reporting times or different reporting intervals.

[0134] Through the above steps, at least the problem of increased feedback information and high feedback overhead caused by the feedback mechanism in related technologies has been solved, the feedback overhead has been reduced, and the flexibility and efficiency of CSI reporting have been improved.

[0135] The entity performing step S401 can be a receiving node, a terminal, a UE, etc., but is not limited to these.

[0136] In one exemplary embodiment, the reference signal configuration includes at least one of the following:

[0137] Multiple CSI-RS resources, wherein each of the CSI-RS resources includes at least one CSI-RS port;

[0138] A CSI-RS resource, wherein the CSI-RS resource includes a CSI-RS port group, and the CSI-RS port group includes multiple CSI-RS port subgroups.

[0139] In one exemplary embodiment, it further includes:

[0140] Receive the CSI-RS sent by the network side;

[0141] The CSI-RS is measured according to the reference signal configuration to obtain the measurement result;

[0142] Based on the measurement results and the first indication, the channel state information is calculated, and the channel state information corresponding to the first reporting type or the channel state information corresponding to the second reporting type is reported to the network side; wherein, the channel state information includes at least one of the following: precoding indication (PMI), channel quality indication (CQI), and rank indication (RI).

[0143] In one exemplary embodiment, it further includes:

[0144] Receive the CSI-RS sent by the network side;

[0145] The CSI-RS is measured according to the reference signal configuration to obtain the measurement result;

[0146] Based on the measurement results, a second indication is generated and reported to the network side; the second indication is used to instruct the UE on the network side to report channel state information using the first reporting type or the second reporting type.

[0147] In one exemplary embodiment, the reporting time of the first reporting type is the first reporting time, and the reporting time of the second reporting type is the second reporting time; the reporting period interval configured for the first reporting type is greater than or equal to the reporting period interval configured for the second reporting type.

[0148] In one exemplary embodiment, the PMI corresponding to the second reporting type is jointly determined by the channel state information reported using the first reporting type and the channel state information reported using the second reporting type.

[0149] In one exemplary embodiment, the PMI corresponding to the second reporting type is jointly determined by the channel state information reported using the first reporting type and the channel state information reported using the second reporting type; wherein, the first reporting type is the reporting type whose reporting time is closest to the reporting time of the second reporting type.

[0150] In an exemplary embodiment, the PMI corresponding to the second reporting type is determined by the channel state information reported using the first reporting type, the channel state information reported using the second reporting type, and a third indication; the third indication is an indication that instructs the UE on the network side to select the CSI-RS resource or the CSI-RS port subgroup using the second reporting type.

[0151] In an exemplary embodiment, when the UE reports the channel state information using the first reporting type, the channel state information reported by the UE includes a channel quality indicator (CQI); wherein the CQI is calculated by the UE under the condition that the network side performs precoding based on the PMI corresponding to the second reporting type.

[0152] In one exemplary embodiment, the channel state information reported using the first reporting type includes at least one of the following:

[0153] RI, the first PMI corresponding to the first reporting type, The The corresponding CSI-RS resource or the CSI-RS port group indication; wherein, the for A matrix with L rows and L columns, This indicates the number of ports in the CSI-RS resource corresponding to the first reporting type. N represents the total number of ports in the reference signal configuration, L represents the number of layers for data transmission, and L ≥ RI; the first PMI is the... The first RI column; or,

[0154] RI, the second PMI corresponding to the first reporting type, U L×L and stated Wherein, the U L×L It is an L-row L-column matrix; the second PMI is the... The first RI column; or,

[0155] RI, the third PMI corresponding to the first reporting type, The The corresponding CSI-RS resource or the CSI-RS port group indication; wherein, the For the first reporting type A matrix of rows RI and columns, the for OK downlink channel matrix of columns, This indicates the number of receive antenna ports corresponding to the CSI-RS measurement performed by the UE using the first reporting type. M is the total number of receive antenna ports when the UE performs CSI-RS measurements; the third PMI is... or,

[0156] The

[0157] In one exemplary embodiment, the channel state information reported using the second reporting type includes at least one of the following:

[0158] RI, the fourth PMI and B corresponding to the second reporting type L×RI ; wherein, the B L×RI The matrix consists of L rows and RI columns corresponding to the second reporting type; the fourth PMI is V1B. L×RI V1 is the first reporting type that was reported using the reporting time closest to the current reporting time of the second reporting type. Matrix, or based on multiple historical reporting records of the first reporting type. The matrix obtained from the matrix; or,

[0159] RI, the fifth PMI corresponding to the second reporting type, and the B L×RI The fifth PMI is V1B. L×RI Or V1U1B L×RI Where V1 and U1 are respectively the reports submitted using the first reporting type that are closest to the current reporting time of the second reporting type. The matrix and the U reported using the first reporting type that is closest to the current reporting time of the second reporting type. L×L Matrix, or respectively based on multiple historical reporting records of the first reporting type. The matrix obtained from the matrix and the multiple U values ​​in the historical reporting records according to the first reporting type L×L The matrix obtained from the matrix; or,

[0160] RI, the sixth PMI corresponding to the second reporting type and Among them, the For the second reporting type A matrix of rows and columns, wherein the sixth PMI is H1 is the report submitted using the first reporting type, which is closest to the current reporting time of the second reporting type. Matrix, or multiple historical reporting records based on the first reporting type. The resulting matrix; or,

[0161] The or,

[0162] RI, the seventh PMI corresponding to the second reporting type, and the B L×RI The third indication; the third indication is used to instruct the UE on the network side to use the CSI-RS resource or the CSI-RS port subgroup selected by the second reporting type; the seventh PMI is V2B.L×RI or V2U2B L×RI V2 is the CSI-RS resource or CSI-RS port subgroup indicated by the third indication, from V1. The N1-row matrix determined in the row matrix, U2 is the L1-row matrix determined from the L-row matrix of U1, where L1 ≤ L, based on the CSI-RS resource or CSI-RS port subgroup indicated by the third indication; or,

[0163] RI, the eighth PMI corresponding to the second reporting type, the The third instruction; the eighth PMI is H2 is the CSI-RS resource or CSI-RS port subgroup indicated by the third indication, from H1. The N1-row matrix determined in the row matrix,

[0164] In one exemplary embodiment, it further includes:

[0165] When the second reporting type is used, a third indication is reported to the network side; the third indication is used to indicate that the CSI-RS resource or the CSI-RS port subgroup corresponding to the second reporting type is reported.

[0166] The PMI corresponding to the second reporting type is determined by the channel state information reported using the first reporting type, the channel state information reported using the second reporting type, and the third indication.

[0167] In distributed MIMO systems, increasing the number of cooperative TRPs can significantly improve network performance and user experience. However, existing feedback mechanisms require the UE to additionally feed back the channel state information between the newly added TRP and the UE when increasing the number of cooperative TRPs, resulting in a proportional increase in feedback overhead.

[0168] In this embodiment of the disclosure, when reporting using the second reporting type, it can be determined that the currently serving Transmitting Node (TRP) is not suitable for data transmission. In this case, a third indication can be reported to the network side. The third indication can be used to instruct the reporting of the CSI-RS resource or CSI-RS port subgroup corresponding to the second reporting type, so that the network side does not enable the currently serving Transmitting Node (TRP).

[0169] The following examples further illustrate the signal status information reporting method of this disclosure:

[0170] Example 1: Basic CJT Flowchart, Reference Signal Configuration

[0171] As shown in Figure 1, assume that the k-th TRP has N k There are one antenna or antenna port, and the cooperative TRP set has a total of The UE has M antennas or antenna ports, and the downlink channel matrix of the entire distributed system can be represented as follows: in This represents the downlink channel matrix formed by the k-th TRP and the UE.

[0172] The network side can configure reference signals, such as CSI-RS, for the UE to perform channel measurements. Taking CSI-RS as an example, this includes, but is not limited to, the following methods:

[0173] 1) K CSI-RS resources can be configured for the UE, and each CSI-RS resource contains N k Each port. At this time, each CSI-RS resource corresponds to one TRP.

[0174] 2) One CSI-RS resource can be configured for the UE. One CSI-RS resource contains a total of [number missing] [items missing]. There are N ports, corresponding to a port group. These ports are divided into K port subgroups, each containing N ports. k There are 10 ports. In fact, each port subgroup corresponds to a TRP.

[0175] In the above process, the network side indicates the number of ports in each CSI-RS resource or port subgroup via signaling, i.e., {N1, N2, ..., N...} k This is provided to the UE. This method supports situations where the number of TRP ports differs. If the network side and the UE agree that the number of ports in each CSI-RS resource or port subgroup is the same, then only the value of that number of ports needs to be indicated to the UE.

[0176] The UE receives a reference signal and obtains the channel matrix H through measurement, then calculates the channel state information and feeds it back to the network side. Channel state information may include, but is not limited to, PMI, CQI, and RI.

[0177] Example 2 reduces feedback overhead by combining the first and second reporting types.

[0178] In order to provide timely feedback of DMIMO system channel status information and reduce CSI feedback overhead, this embodiment 2 proposes a method that combines reporting using the first reporting type with reporting using the second reporting type.

[0179] Figure 5 is a schematic diagram of the reporting time of the reporting type according to an embodiment of this disclosure. As shown in Figure 5, the content and overhead of the UE feedback differ at different times. Typically, the channel state information fed back based on the first reporting type contains relatively complete CSI information, resulting in higher overhead. However, the channel state information fed back based on the first reporting type utilizes the correlation of CSI information over time to describe changes in the channel, resulting in lower overhead. Combining the two reporting types can reduce feedback overhead.

[0180] The network side can configure the CSI reporting time via signaling, for example, configuring CSI reporting as periodic or semi-persistent, and configuring the period interval for each report. The methods for determining the UE reporting type may include, but are not limited to:

[0181] 1) The network side configures the first reporting time / second reporting time, for example, instructing the UE that the current reporting time is the first reporting time and the first reporting type is used, and the remaining reporting times use the second reporting type;

[0182] 2) The UE determines whether to use the first or second reporting type based on the channel measurement results, and can indicate the selected reporting type to the network side.

[0183] Taking PMI as an example, we analyze the combination of the first and second reporting types. The PMI corresponding to the second reporting type can be determined jointly by the channel measurement information reported using the first and second reporting types. Furthermore, if the channel measurement information corresponding to the second reporting type includes CQI, then when calculating CQI, we can assume that the network-side precoding vector is PMI.

[0184] The methods for determining the PMI corresponding to the second reporting type include, but are not limited to: calculating the PMI based on the channel measurement information most recently reported using the first reporting type and the channel measurement information currently reported using the second reporting type, or calculating the PMI based on the historical records of the channel measurement information reported using the first reporting type and the channel measurement information currently reported using the second reporting type.

[0185] For example, the reported PMI can be represented as a 3D tensor: the first dimension is the antenna port, i.e., the spatial dimension, whose size is equivalent to the number of CSI-RS ports determined by the UE. For example, if four TRPs serve the UE in CJT mode, and each TRP has 32 antenna ports, and the UE selects three TRPs to transmit data after measurement, then the size of the first dimension is 96. The second dimension is the number of data transmission layers, i.e., RI. The third dimension is the frequency domain dimension, meaning that the PMI of different frequency domain units may differ. The UE feedback PMI is implemented based on a codebook, which is essentially a quantization of the 3D tensor. Quantization methods can include, but are not limited to:

[0186] 1) Quantize the amplitude / phase of each element separately.

[0187] 2) For any given dimension, once determined, the PMI information for the remaining two dimensions can be equivalently represented as a matrix, which can be expressed as a linear combination of vectors. For example, the PMI of a specific layer (i.e., the second dimension) can be linearly represented by spatial basis vectors and frequency basis vectors. The PMI corresponding to the g-th frequency unit of the l-th layer is:

[0188] Where {w i} and {z i} are spatial domain basis vectors and frequency domain basis vectors, respectively, and Y represents the linear combination coefficients.

[0189] This Example 2 considers only the PMI corresponding to the first / second reporting type under a specific frequency domain unit (such as a specific RB, a specific RB group, or a specific sub-band). The equivalent matrix corresponding to the PMI can be obtained using the quantization method described above. Furthermore, when the first / second reporting types differ in the granularity of frequency domain division, the final PMI corresponding to a specific frequency domain unit can be obtained through specific criteria. This will not be elaborated further in this Example 2.

[0190] For the first reporting type, the content reported by the UE (i.e., channel state information) may include the following forms. This embodiment only lists some of the reported content, and the actual reported content may not be limited to these:

[0191] Format 1: RI, PMI corresponding to the first reporting type, matrix in, This indicates the number of CSI-RS ports being reported. The reported content may also include indications of CSI-RS resources or CSI-RS port groups, based on which the matrix can be determined. For which CSI-RS ports? Furthermore, setting L≥RI can improve the accuracy of reports using the second reporting type, allowing for the use of more basis vectors to represent the PMI. The PMI corresponding to the first reporting type under Form 1 is... The first RI column.

[0192] Form 2: Based on Form 1, add a feedback matrix U. L×L After receiving the reported content, the network side can restore the downlink channel matrix. Using the second reporting type allows for better selection of the TRP state (e.g., off, on). This addresses the technical problem of some transmitting nodes being unsuitable for data transmission at certain times due to the Doppler effect. Furthermore, the network side can obtain the complete channel matrix (compared to obtaining only the matrix). This allows for better resource allocation and user scheduling. The PMI corresponding to the first reporting type under Form 2 is... The first RI column.

[0193] Format 3: RI, PMI corresponding to the first reporting type, in, This indicates the number of CSI-RS ports targeted for feedback. The corresponding reporting content may also include indications of CSI-RS resources or CSI-RS port groups. in The number of receive antenna ports used for CSI-RS measurements of the UE, where H represents the downlink channel matrix. The UE also reports the matrix. The PMI corresponding to the first reporting type under Form 3 is

[0194] Form 4: Matrix In Form 4, the UE does not need to make PMI, RI, and CQI recommendations on the network side; the network side can determine them independently based on the channel matrix.

[0195] In the above forms, RI is determined by UE, and parameter L... The configuration is provided to the UE by the network side, or determined by the UE.

[0196] For the second reporting type, the content reported by the UE (i.e., channel state information) may include the following forms, which correspond one-to-one with the forms of the content reported by the first reporting type. This embodiment only lists some of the reported content, and the actual reported content may not be limited to these.

[0197] Form 1): RI, PMI corresponding to the second reporting type, matrix B L×RI In Form 1), the PMI calculation method corresponding to the second reporting type is V1B. L×RI V1 can be the matrix of reports submitted with the first reporting type that is closest to the current reporting time using the second reporting type, or it can be composed of multiple historical reporting contents (such as multiple historical reports) from the historical reporting records of the first reporting type. The matrix is ​​obtained.

[0198] Form 2): RI, PMI corresponding to the second reporting type, matrix B L×RI In Form 2), the PMI calculation method corresponding to the second reporting type can be V1B. L×RIOr V1U1B L×RI Where V1 and U1 can be the first reporting type reported using the reporting time closest to the current reporting time of the second reporting type, respectively. Matrix and the U L×L Matrix, or multiple historical reporting records based on the first reporting type. The matrix obtained from the matrix and multiple U values ​​in the historical reporting records based on the first reporting type L×L The matrix obtained from the matrix.

[0199] Form 3): RI, PMI corresponding to the second reporting type, matrix The PMI calculation method corresponding to the second reporting type under form 3) is as follows: H1 can be a report submitted using the first reporting type, which is closest to the current reporting time of the second reporting type. Matrix, or multiple historical reporting records based on the first reporting type. The resulting matrix.

[0200] Form 4): Matrix Form 4 is equivalent to updating only the channel matrix.

[0201] Example 3: Indication of Service TRP Changes

[0202] At the second reporting time (i.e., when reporting channel state information using the second reporting type), once the UE measures and finds that some TRPs are no longer suitable for data transmission, it can update the serving TRP by reporting relevant indication information and maintain low feedback overhead. The specific method can be as follows:

[0203] Assume there are 4 TRP serving UEs with antenna port numbers {4, 6, 8, 8}, and corresponding CSI-RS configuration information including N1=4, N2=6, N3=N4=8. At the first reporting time (i.e., reporting channel state information using the first reporting type), the UE can choose to serve via TRP1, TRP2, or TRP3, which can be indicated via bitmap '1110'. If, during the second reporting time, it is found that TRP 2 is no longer suitable for transmission, the UE will provide feedback indication information, such as bitmap '101'.

[0204] The corresponding PMI calculation method is as follows:

[0205] For form 2) using the second reporting type, the reported RI, the PMI corresponding to the second reporting type, and matrix B are... L×RI The PMI calculation method corresponding to the second reporting type can be (V2U2)[{1:4,11:18},:]B L×RIThis involves extracting specific rows from matrix V2U2, corresponding to the selected CSI-RS ports.

[0206] For form 3) using the second reporting type, the reported RI, the PMI corresponding to the second reporting type, and the matrix are... The PMI calculation method corresponding to the second reporting type can be:

[0207] Through the above description of the embodiments, those skilled in the art can clearly understand that the methods according to the above embodiments can be implemented by means of software plus necessary general-purpose hardware platforms. Of course, they can also be implemented by hardware, but in many cases the former is a better implementation method. Based on this understanding, the technical solution of this disclosure, in essence, or the part that contributes to the prior art, can be embodied in the form of a software product. This computer software product is stored in a storage medium (such as ROM / RAM, magnetic disk, optical disk), and includes several instructions to cause a terminal device (which may be a mobile phone, computer, server, or network device, etc.) to execute the methods described in the various embodiments of this disclosure.

[0208] Embodiments of this disclosure also provide a base station for implementing the steps in any of the above method embodiments.

[0209] Embodiments of this disclosure also provide a user terminal for implementing the steps in any of the above method embodiments.

[0210] Embodiments of this disclosure also provide a computer-readable storage medium storing a computer program configured to perform the steps in any of the above method embodiments when executed.

[0211] In one exemplary embodiment, the aforementioned computer-readable storage medium may include, but is not limited to, various media capable of storing computer programs, such as a USB flash drive, read-only memory (ROM), random access memory (RAM), portable hard disk, magnetic disk, or optical disk.

[0212] Figure 6 is a structural block diagram of an electronic device according to an embodiment of the present disclosure. As shown in Figure 6, an embodiment of the present disclosure also provides an electronic device 60, including a memory 601 and a processor 602. The memory 601 stores a computer program, and the processor is configured to run the computer program to perform the steps in any of the above method embodiments.

[0213] In one exemplary embodiment, the electronic device may further include a transmission device and an input / output device, wherein the transmission device is connected to the processor and the input / output device is connected to the processor.

[0214] Specific examples in this embodiment can be found in the examples described in the above embodiments and exemplary implementations, and will not be repeated here.

[0215] Embodiments of this disclosure also provide a computer program product, including a computer program that, when executed by a processor, implements the steps in any of the above method embodiments.

[0216] It is obvious to those skilled in the art that the modules or steps of this disclosure described above can be implemented using general-purpose computing devices. They can be centralized on a single computing device or distributed across a network of multiple computing devices. They can be implemented using computer-executable program code, and thus can be stored in a storage device for execution by a computing device. In some cases, the steps shown or described can be performed in a different order than those presented herein, or they can be fabricated as separate integrated circuit modules, or multiple modules or steps can be fabricated as a single integrated circuit module. Thus, this disclosure is not limited to any particular combination of hardware and software.

[0217] The above description is merely a preferred embodiment of this disclosure and is not intended to limit this disclosure. Various modifications and variations can be made to this disclosure by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the principles of this disclosure should be included within the scope of protection of this disclosure.

Claims

1. A method for reporting channel state information, applied on the network side, comprising: The reference signal configuration and the corresponding reporting configuration are sent to the user terminal UE via signaling. The reporting configuration includes a first reporting type, a second reporting type, and a first indication. The first indication is used to instruct the UE to report channel status information using the first reporting type or the second reporting type.

2. The method according to claim 1, wherein, The reference signal configuration includes at least one of the following: Multiple Channel State Information Measurement Reference Signal (CSI-RS) resources, wherein each CSI-RS resource includes at least one CSI-RS port; A CSI-RS resource, wherein the CSI-RS resource includes a CSI-RS port group, and the CSI-RS port group includes multiple CSI-RS port subgroups.

3. The method according to claim 1, wherein, After sending the reference signal configuration and the corresponding reporting configuration to the user terminal UE via signaling, the method further includes: Send CSI-RS to the UE; The system receives channel state information reported by the UE according to the first reporting type or the second reporting type based on the CSI-RS and the first indication; the channel state information includes at least one of the following: precoding indication (PMI), channel quality indication (CQI), and rank indication (RI).

4. The method according to claim 1, wherein, After sending the reference signal configuration and the corresponding reporting configuration to the user terminal UE via signaling, the method further includes: Send CSI-RS to the UE; The network receives a second indication reported by the UE, the second indication being used to instruct the UE on the network side to report channel status information using either the first reporting type or the second reporting type.

5. The method according to claim 1, 3, or 4, wherein, The reporting time of the first reporting type is the first reporting time, and the reporting time of the second reporting type is the second reporting time; the reporting period interval configured for the first reporting type is greater than or equal to the reporting period interval configured for the second reporting type.

6. The method according to claim 3, wherein, The PMI corresponding to the second reporting type is jointly determined by the channel state information reported using the first reporting type and the channel state information reported using the second reporting type.

7. The method according to claim 3, wherein, The PMI corresponding to the second reporting type is jointly determined by the channel state information reported using the first reporting type and the channel state information reported using the second reporting type; wherein, the first reporting type is the reporting type whose reporting time is closest to the reporting time of the second reporting type.

8. The method according to claim 3, wherein, The PMI corresponding to the second reporting type is determined by the channel state information reported using the first reporting type, the channel state information reported using the second reporting type, and a third indication; the third indication is an indication that instructs the UE on the network side to select the CSI-RS resource or the CSI-RS port subgroup using the second reporting type.

9. The method according to claim 7, wherein, When the UE reports the channel state information using the second reporting type, the channel state information reported by the UE includes a channel quality indicator (CQI); wherein the CQI is calculated by the UE under the condition that the network side performs precoding based on the PMI corresponding to the second reporting type.

10. The method according to claim 2, wherein, The channel state information reported using the first reporting type includes: RI, the first PMI corresponding to the first reporting type, The The corresponding CSI-RS resource or the CSI-RS port group indication; wherein, the for A matrix with L rows and L columns, This indicates the number of ports in the CSI-RS resource corresponding to the first reporting type. N represents the total number of ports in the reference signal configuration, L represents the number of layers for data transmission, and L ≥ RI; the first PMI is the... The first RI column; or, RI, the second PMI corresponding to the first reporting type, U L×L and stated Wherein, the U L×L It is an L-row L-column matrix; the second PMI is the... The first RI column; or, RI, the third PMI corresponding to the first reporting type, The The corresponding CSI-RS resource or the CSI-RS port group indication; wherein, the For the first reporting type A matrix of rows RI and columns, the for OK downlink channel matrix of columns, This indicates the number of receive antenna ports corresponding to the CSI-RS measurement performed by the UE using the first reporting type. M is the total number of receive antenna ports when the UE performs CSI-RS measurements; the third PMI is... or, The 11. The method according to claim 10, wherein, The channel state information reported using the second reporting type includes: RI, the fourth PMI and B corresponding to the second reporting type L×RI ; wherein, the B L×RI The matrix consists of L rows and RI columns corresponding to the second reporting type; the fourth PMI is V1B. L×RI V1 is the first reporting type that was reported using the reporting time closest to the current reporting time of the second reporting type. Matrix, or based on multiple historical reporting records of the first reporting type. The matrix obtained from the matrix; or, RI, the fifth PMI corresponding to the second reporting type, and the B L×RI The fifth PMI is V1B. L×RI Or V1U1B L×RI Where V1 and U1 are respectively the reports submitted using the first reporting type that are closest to the current reporting time of the second reporting type. The matrix and the U reported using the first reporting type that is closest to the current reporting time of the second reporting type. L×L Matrix, or respectively based on multiple historical reporting records of the first reporting type. The matrix obtained from the matrix and the multiple U values ​​in the historical reporting records according to the first reporting type L×L The matrix obtained from the matrix; or, RI, the sixth PMI corresponding to the second reporting type and Among them, the For the second reporting type A matrix of rows and columns, wherein the sixth PMI is H1 is the report submitted using the first reporting type, which is closest to the current reporting time of the second reporting type. Matrix, or multiple historical reporting records based on the first reporting type. The resulting matrix; or, The or, RI, the seventh PMI corresponding to the second reporting type, and the B L×RI The third indication; the third indication is used to instruct the UE on the network side to use the CSI-RS resource or the CSI-RS port subgroup selected by the second reporting type; the seventh PMI is V2B. L×RI or V2U2B L×RI V2 is the CSI-RS resource or CSI-RS port subgroup indicated by the third indication, from V1. The N1-row matrix determined in the row matrix, U2 is the L1-row matrix determined from the L-row matrix of U1, where L1 ≤ L, based on the CSI-RS resource or CSI-RS port subgroup indicated by the third indication; or, RI, the eighth PMI corresponding to the second reporting type, the The third instruction; the eighth PMI is H2 is the CSI-RS resource or CSI-RS port subgroup indicated by the third indication, from H1. The N1-row matrix determined in the row matrix, 12. A method for reporting channel state information, applied to a UE, comprising: The receiving network side sends a reference signal configuration via signaling and the corresponding reporting configuration. The reporting configuration includes a first reporting type, a second reporting type, and a first indication. The first indication is used to instruct the UE to report channel status information using the first reporting type or the second reporting type.

13. The method according to claim 12, wherein, The reference signal configuration includes at least one of the following: Multiple CSI-RS resources, wherein each of the CSI-RS resources includes at least one CSI-RS port; A CSI-RS resource, wherein the CSI-RS resource includes a CSI-RS port group, and the CSI-RS port group includes multiple CSI-RS port subgroups.

14. The method according to claim 12, wherein, Also includes: Receive the CSI-RS sent by the network side; The CSI-RS is measured according to the reference signal configuration to obtain the measurement result; Based on the measurement results and the first indication, the channel state information is calculated, and the channel state information corresponding to the first reporting type or the channel state information corresponding to the second reporting type is reported to the network side; wherein, the channel state information includes at least one of the following: precoding indication (PMI), channel quality indication (CQI), and rank indication (RI).

15. The method according to claim 12, wherein, Also includes: Receive the CSI-RS sent by the network side; The CSI-RS is measured according to the reference signal configuration to obtain the measurement result; Based on the measurement results, a second indication is generated and reported to the network side; The second indication is used to instruct the UE on the network side to report channel status information using the first reporting type or the second reporting type.

16. The method according to claim 12, 14, or 15, wherein, The reporting time of the first reporting type is the first reporting time, and the reporting time of the second reporting type is the second reporting time; the reporting period interval configured for the first reporting type is greater than or equal to the reporting period interval configured for the second reporting type.

17. The method of claim 14, wherein, The PMI corresponding to the second reporting type is jointly determined by the channel state information reported using the first reporting type and the channel state information reported using the second reporting type.

18. The method according to claim 14, wherein, The PMI corresponding to the second reporting type is jointly determined by the channel state information reported using the first reporting type and the channel state information reported using the second reporting type; wherein, the first reporting type is the reporting type whose reporting time is closest to the reporting time of the second reporting type.

19. The method of claim 14, wherein, The PMI corresponding to the second reporting type is determined by the channel state information reported using the first reporting type, the channel state information reported using the second reporting type, and a third indication; the third indication is an indication that instructs the UE on the network side to select the CSI-RS resource or the CSI-RS port subgroup using the second reporting type.

20. The method according to claim 12, wherein, When the UE reports the channel state information using the first reporting type, the channel state information reported by the UE includes a channel quality indicator (CQI); wherein the CQI is calculated by the UE under the condition that the network side performs precoding based on the PMI corresponding to the second reporting type.

21. The method according to claim 13, wherein, The channel state information reported using the first reporting type includes: RI, the first PMI corresponding to the first reporting type, The The corresponding CSI-RS resource or the CSI-RS port group indication; wherein, the for A matrix with L rows and L columns, This indicates the number of ports in the CSI-RS resource corresponding to the first reporting type. N represents the total number of ports in the reference signal configuration, L represents the number of layers for data transmission, and L ≥ RI; the first PMI is the... The first RI column; or, RI, the second PMI corresponding to the first reporting type, U L×L and stated Wherein, the U L×L It is an L-row L-column matrix; the second PMI is the... The first RI column; or, RI, the third PMI corresponding to the first reporting type, The The corresponding CSI-RS resource or the CSI-RS port group indication; wherein, the For the first reporting type A matrix of rows RI and columns, the for OK downlink channel matrix of columns, This indicates the number of receive antenna ports corresponding to the CSI-RS measurement performed by the UE using the first reporting type. M is the total number of receive antenna ports when the UE performs CSI-RS measurements; the third PMI is... or, The 22. The method according to claim 21, wherein, The channel state information reported using the second reporting type includes: RI, the fourth PMI and B corresponding to the second reporting type L×RI ; wherein, the B L×RI The matrix consists of L rows and RI columns corresponding to the second reporting type; the fourth PMI is V1B. L×RI V1 is the first reporting type that was reported using the reporting time closest to the current reporting time of the second reporting type. Matrix, or based on multiple historical reporting records of the first reporting type. The matrix obtained from the matrix; or, RI, the fifth PMI corresponding to the second reporting type, and the B L×RI The fifth PMI is V1B. L×RI Or V1U1B L×RI Where V1 and U1 are respectively the reports submitted using the first reporting type that are closest to the current reporting time of the second reporting type. The matrix and the U reported using the first reporting type that is closest to the current reporting time of the second reporting type. L×L Matrix, or respectively based on multiple historical reporting records of the first reporting type. The matrix obtained from the matrix and the multiple U values ​​in the historical reporting records according to the first reporting type L×L The matrix obtained from the matrix; or, RI, the sixth PMI corresponding to the second reporting type and Among them, the For the second reporting type A matrix of rows and columns, wherein the sixth PMI is H1 is the report submitted using the first reporting type, which is closest to the current reporting time of the second reporting type. Matrix, or multiple historical reporting records based on the first reporting type. The resulting matrix; or, The or, RI, the seventh PMI corresponding to the second reporting type, and the B L×RI The third indication; the third indication is used to instruct the UE on the network side to use the CSI-RS resource or the CSI-RS port subgroup selected by the second reporting type; the seventh PMI is V2B. L×RI or V2U2B L×RI V2 is the CSI-RS resource or CSI-RS port subgroup indicated by the third indication, from V1. The N1-row matrix determined in the row matrix, U2 is the L1-row matrix determined from the L-row matrix of U1, where L1 ≤ L, based on the CSI-RS resource or CSI-RS port subgroup indicated by the third indication; or, RI, the eighth PMI corresponding to the second reporting type, the The third instruction; the eighth PMI is H2 is the CSI-RS resource or CSI-RS port subgroup indicated by the third indication, from H1. The N1-row matrix determined in the row matrix, 23. A base station for implementing the steps of the method according to any one of claims 1 to 11.

24. A user terminal, the user terminal being configured to implement the steps of the method described in any one of claims 12 to 22.

25. A computer-readable storage medium storing a computer program, wherein, When the computer program is executed by a processor, it implements the steps of the method described in any one of claims 1 to 11, or the steps of the method described in any one of claims 12 to 22.

26. An electronic device comprising a memory, a processor, and a computer program stored in the memory and executable on the processor, wherein the processor, when executing the computer program, implements the steps of the method according to any one of claims 1 to 11, or implements the steps of the method according to any one of claims 12 to 22.

27. A computer program product comprising a computer program that, when executed by a processor, implements the steps of the method according to any one of claims 1 to 11, or implements the steps of the method according to any one of claims 12 to 22.

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