Communication method and apparatus, and terminal device, network-side device and readable storage medium

Abstract

The present application belongs to the technical field of communications. Disclosed are a communication method and apparatus, and a terminal device, a network-side device and a readable storage medium. The communication method in the embodiments of the present application comprises: a terminal device sending a non-codebook sounding reference signal (SRS), precoding information of which non-codebook SRS is determined on the basis of a first downlink reference signal or a second downlink reference signal, wherein the number of ports of the first downlink reference signal is greater than the number of ports of the second downlink reference signal, and antenna ports associated with the first downlink reference signal include antenna ports associated with the second downlink reference signal.

Description

Communication methods, devices, terminal equipment, network-side equipment, and readable storage media

[0001] Cross-references to related applications

[0002] This application claims priority to Chinese Patent Application No. 202510321775.7, filed on March 18, 2025, the entire contents of which are incorporated herein by reference. Technical Field

[0003] This application belongs to the field of communication technology, specifically relating to a communication method, apparatus, terminal equipment, network-side equipment, and readable storage medium. Background Technology

[0004] Currently, in order to improve the utilization of downlink resources, base stations may intermittently transmit downlink reference signals of different numbers of ports, such as Channel State Information-Reference Signal (CSI-RS).

[0005] In related technologies, for non-codebook transmission modes, based on the principle of uplink-downlink reciprocity, the user equipment (UE) needs to determine the precoding information of the uplink sounding reference signal (SRS) by measuring the downlink CSI-RS.

[0006] However, in scenarios where base stations intermittently transmit downlink reference signals for both large and small ports, there is no solution yet for determining the precoding information of the Non-codebook SRS based on the measurement of the downlink reference signal. Therefore, how to accurately determine the precoding information of the Non-codebook Probe Reference Signal (SRS) based on the CSI-RS to improve transmission performance is an urgent problem to be solved. Summary of the Invention

[0007] This application provides a communication method, apparatus, terminal device, network-side device, and readable storage medium, which can avoid mismatch between terminal device transmission and network-side device reception, thereby improving transmission performance.

[0008] In a first aspect, a communication method is provided, the method comprising: a terminal device transmitting a non-codebook probe reference signal (SRS), wherein the precoding information of the non-codebook SRS is determined based on a first downlink reference signal or a second downlink reference signal; wherein the number of ports of the first downlink reference signal is greater than the number of ports of the second downlink reference signal, and the antenna ports associated with the first downlink reference signal include the antenna ports associated with the second downlink reference signal.

[0009] Secondly, a communication method is provided, comprising: a network-side device transmitting a first downlink reference signal and a second downlink reference signal, wherein the second downlink reference signal is associated with the first downlink reference signal; the number of ports of the first downlink reference signal is greater than the number of ports of the second downlink reference signal, and the antenna ports associated with the first downlink reference signal include the antenna ports associated with the second downlink reference signal; the network-side device receiving a non-codebook probe reference signal (SRS); wherein the precoding information of the non-codebook SRS is determined based on the first downlink reference signal or the second downlink reference signal.

[0010] Thirdly, a communication device is provided, comprising: a transmitting module; the transmitting module being configured to transmit a non-codebook detection reference signal (SRS), wherein the precoding information of the non-codebook SRS is determined based on a first downlink reference signal or a second downlink reference signal; wherein the number of ports of the first downlink reference signal is greater than the number of ports of the second downlink reference signal, and the antenna ports associated with the first downlink reference signal include the antenna ports associated with the second downlink reference signal.

[0011] Fourthly, a communication device is provided, comprising: a transmitting module and a receiving module, wherein: the transmitting module is configured to transmit a first downlink reference signal and a second downlink reference signal, the second downlink reference signal being associated with the first downlink reference signal; the number of ports of the first downlink reference signal is greater than the number of ports of the second downlink reference signal, and the antenna ports associated with the first downlink reference signal include the antenna ports associated with the second downlink reference signal; the receiving module is configured to receive a non-codebook detection reference signal (SRS); wherein the precoding information of the non-codebook SRS is determined based on the first downlink reference signal or the second downlink reference signal.

[0012] Fifthly, a communication device is provided, the device being configured to perform the steps of the method described in the first aspect, or to implement the steps of the method described in the second aspect.

[0013] In a sixth aspect, a terminal is provided, the terminal including a processor and a memory, the memory storing a program or instructions executable on the processor, the program or instructions, when executed by the processor, implementing the steps of the method as described in the first aspect.

[0014] In a seventh aspect, a terminal is provided, including a processor and a communication interface, wherein the communication interface is used to transmit a non-codebook probe reference signal (SRS), the precoding information of which is determined based on a first downlink reference signal or a second downlink reference signal; wherein the number of ports of the first downlink reference signal is greater than the number of ports of the second downlink reference signal, and the antenna ports associated with the first downlink reference signal include the antenna ports associated with the second downlink reference signal.

[0015] Eighthly, a network-side device is provided, the network-side device including a processor and a memory, the memory storing a program or instructions executable on the processor, the program or instructions, when executed by the processor, implementing the steps of the method as described in the first aspect.

[0016] A ninth aspect provides a network-side device, including a processor and a communication interface, wherein the communication interface is used to transmit a first downlink reference signal and a second downlink reference signal; the number of ports of the first downlink reference signal is greater than the number of ports of the second downlink reference signal, and the antenna port associated with the first downlink reference signal includes the antenna port associated with the second downlink reference signal; and to receive a non-codebook probe reference signal (SRS); wherein the precoding information of the non-codebook SRS is determined based on the first downlink reference signal or the second downlink reference signal.

[0017] In a tenth aspect, a readable storage medium is provided, on which a program or instructions are stored, which, when executed by a processor, implement the steps of the method described in the first aspect, or implement the steps of the method described in the second aspect.

[0018] Eleventhly, a wireless communication system is provided, comprising: a terminal and a network-side device, wherein the terminal can be used to perform the steps of the method as described in the first aspect, and the network-side device can be used to perform the steps of the method as described in the second aspect.

[0019] In a twelfth aspect, a chip is provided, the chip including a processor and a communication interface coupled to the processor, the processor being configured to run programs or instructions to implement the method as described in the first aspect, or to implement the method as described in the second aspect.

[0020] In a thirteenth aspect, a computer program / program product is provided, which is stored in a storage medium and executed by at least one processor to implement the steps of the two methods as described in the first aspect.

[0021] In this embodiment, the terminal device transmits a non-codebook SRS. The precoding information of the non-codebook SRS is determined based on a first downlink reference signal or a second downlink reference signal. The number of ports in the first downlink reference signal is greater than the number of ports in the second downlink reference signal, and the antenna ports associated with the first downlink reference signal include the antenna ports associated with the second downlink reference signal. Through this method, the terminal device can determine the precoding information of the SRS based on the first downlink reference signal or the second downlink reference signal, thereby avoiding mismatch between the terminal device's transmission and the network-side device's reception in non-codebook-based uplink transmission scenarios and improving transmission performance. Attached Figure Description

[0022] Figure 1 is a block diagram of a wireless communication system provided in some embodiments of this application;

[0023] Figure 2 is a flowchart illustrating a communication method provided in some embodiments of this application;

[0024] Figure 3 is a schematic diagram of DCI-triggered SRS and CSI-RS provided in some embodiments of this application;

[0025] Figure 4 is a schematic diagram of DCI-triggered SRS and CSI-RS provided in some embodiments of this application;

[0026] Figure 5 is a flowchart illustrating the communication method provided in some embodiments of this application;

[0027] Figure 6 is a schematic diagram of the interaction method provided in some embodiments of this application;

[0028] Figure 7 is a schematic diagram of the interaction methods provided in some embodiments of this application;

[0029] Figure 8 is a schematic diagram of a communication device provided in some embodiments of this application;

[0030] Figure 9 is a schematic diagram of a communication device provided in some embodiments of this application;

[0031] Figure 10 is a schematic diagram of the structure of a communication device provided in some embodiments of this application;

[0032] Figure 11 is a schematic diagram of the structure of a terminal provided in some embodiments of this application.

[0033] Figure 12 is a schematic diagram of the structure of a network-side device provided in some embodiments of this application. Detailed Implementation

[0034] The technical solutions of the embodiments of this application will be clearly described below with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of this application. All other embodiments obtained by those skilled in the art based on the embodiments of this application are within the scope of protection of this application.

[0035] The terms "first," "second," etc., used in this application are used to distinguish similar objects and not to describe a specific order or sequence. It should be understood that such terms can be used interchangeably where appropriate so that embodiments of this application can be implemented in orders other than those illustrated or described herein, and the objects distinguished by "first" and "second" are generally of the same class, not limited in number; for example, the first object can be one or more. Furthermore, "or" in this application indicates at least one of the connected objects. For example, the scope of protection for "A or B" covers at least three scenarios: Scenario 1: including A but not B; Scenario 2: including B but not A; Scenario 3: including both A and B. In addition, the terms "A and / or B," "at least one of A and B," and "at least one of A or B" also cover at least the above three scenarios. The character " / " generally indicates that the preceding and following objects are in an "or" relationship.

[0036] The term "instruction" in this application can be either a direct instruction (or explicit instruction) or an indirect instruction (or implicit instruction). A direct instruction can be understood as one in which the sender explicitly informs the receiver of specific information, the operation to be performed, or the requested result, etc., in the instruction sent. An indirect instruction can be understood as one in which the receiver determines the corresponding information based on the instruction sent by the sender, or makes a judgment and determines the operation to be performed or the requested result, etc., based on the judgment result.

[0037] It is worth noting that the technologies described in this application are not limited to Long Term Evolution (LTE) / LTE-Advanced (LTE-A) systems, but can also be used in other wireless communication systems, such as Code Division Multiple Access (CDMA), Time Division Multiple Access (TDMA), Frequency Division Multiple Access (FDMA), Orthogonal Frequency Division Multiple Access (OFDMA), Single-carrier Frequency-Division Multiple Access (SC-FDMA), or other systems. The terms "system" and "network" in this application are often used interchangeably, and the described technologies can be used with the systems and radio technologies mentioned above, as well as with other systems and radio technologies. The following description describes New Radio (NR) systems for illustrative purposes, and the term NR is used in most of the following description; however, these technologies can also be applied to systems other than NR systems, such as 6th generation (6G) radio systems. th Generation 6G communication system.

[0038] Figure 1 shows a block diagram of a wireless communication system applicable to an embodiment of this application. The wireless communication system includes a terminal 11a and a network-side device 12a. The terminal 11a can be a mobile phone, tablet computer, laptop computer, notebook computer, personal digital assistant (PDA), handheld computer, netbook, ultra-mobile personal computer (UMPC), mobile internet device (MID), augmented reality (AR), virtual reality (VR) device, robot, wearable device, flight vehicle, vehicle user equipment (VUE), shipboard equipment, pedestrian user equipment (PUE), smart home devices (home devices with wireless communication capabilities, such as refrigerators, televisions, washing machines, or furniture), game consoles, personal computers (PCs), ATMs, or self-service machines, etc. Wearable devices include: smartwatches, smart bracelets, smart headphones, smart glasses, smart jewelry (smart bracelets, smart chains, smart rings, smart necklaces, smart anklets, smart anklets, etc.), smart wristbands, smart clothing, etc. Among these, in-vehicle devices can also be referred to as in-vehicle terminals, in-vehicle controllers, in-vehicle modules, in-vehicle components, in-vehicle chips, or in-vehicle units, etc. It should be noted that the specific type of terminal 11a is not limited in the embodiments of this application. Network-side equipment 12a may include access network equipment or core network equipment, wherein access network equipment may also be referred to as Radio Access Network (RAN) equipment, radio access network function, or radio access network unit. Access network equipment may include base stations, Wireless Local Area Network (WLAN) access points (AS), or Wireless Fidelity (WiFi) nodes, etc.The term "base station" can be referred to as Node B (NB), Evolved Node B (eNB), Next Generation Node B (gNB), New Radio Node B (NR Node B), Access Point, Relay Base Station (RBS), Serving Base Station (SBS), Base Transceiver Station (BTS), Radio Base Station, Radio Transceiver, Basic Service Set (BSS), Extended Service Set (ESS), Home Node B (HNB), Home Evolved Node B, Transmit / Receive Point (TRP), or any other suitable term in the relevant field, as long as the same technical effect is achieved. The term "base station" is not limited to any specific technical terminology. It should be noted that this application embodiment only uses a base station in an NR system as an example for description and does not limit the specific type of base station.

[0039] Core network equipment, also known as core network nodes, core network functions, or core network elements, includes, but is not limited to, at least one of the following: Mobility Management Entity (MME), Access and Mobility Management Function (AMF), Session Management Function (SMF), User Plane Function (UPF), Policy Control Function (PCF), Policy and Charging Rules Function (PCRF), Edge Application Server Discovery Function (EASDF), Unified Data Management (UDM), Unified Data Repository (UDR), Home Subscriber Server (HSS), Centralized network configuration (CNC), Network Repository Function (NRF), Network Exposure Function (NEF), Local NEF (or L-NEF), and Binding Support. The core network functions include: BSF (Block Network Function), Application Function (AF), Location Management Function (LMF), Gateway Mobile Location Centre (GMLC), and Network Data Analytics Function (NWDAF). It should be noted that this application embodiment only uses core network equipment in the NR system as an example and does not limit the specific type of core network equipment. If the name of the core network equipment mentioned in this application embodiment changes in subsequent protocol versions (e.g., 6G), it will still be within the scope of protection of this application.

[0040] Optionally, the core network equipment can be implemented by one or more functional modules in a single device, or by multiple devices working together; this application does not specifically limit this. It is understood that the aforementioned functional modules can be network elements in hardware devices, software functional modules running on dedicated hardware, or virtualized functional modules instantiated on a platform (e.g., a cloud platform).

[0041] The following explains the nouns or terms used in the embodiments of this application.

[0042] Uplink Sounding Reference Signal (SRS):

[0043] In New Radio (NR) systems, SRS can be used for beam management, codebook-based transmission, non-codebook-based transmission, and antenna switching. Terminals can obtain multiple SRS resource sets via higher-layer signaling. Each SRS resource set is configured with its purpose, periodicity characteristics (periodic, semi-persistent, and aperiodic), etc.

[0044] Currently, SRS resources only support transmission on ports 1, 2, 4, and 8. In Release-15 / 16, SRS resources can occupy the last 6 symbols within a single time slot, and the number of SRS symbols Ns that can be configured for higher-layer signaling is {1, 2, 4}, supporting comb-2 and comb-4 structures in the frequency domain. The supported repetition count R is {1, 2, 4}. In Release-17, this is enhanced so that the starting position of SRS symbols within a single time slot can be any symbol within that time slot. The number of SRS symbols Ns increases to {1, 2, 4, 8, 10, 12, 14} symbols, and comb-8 structures are also supported. Furthermore, the supported repetition count R is also increased to {1, 2, 4, 5, 6, 7, 8, 10, 12, 14}. Generally, multiple ports of an SRS resource can be distinguished by a symbol representing different Resource Element (RE) positions and cyclic shifts. However, for an 8-port scenario, SRS ports can be distinguished by Time Division Multiplexing (TDM) symbols based on network configuration.

[0045] Periodic SRS:

[0046] Once the terminal is configured with periodic SRS, it sends SRS according to the configured period. Its transmission bandwidth, frequency domain position, comb structure and other parameters are all configured by RRC.

[0047] Semi-persistent SRS:

[0048] The configuration parameters for Semi-Persistent SRS are similar to those for Periodic SRS. A terminal can only send Semi-Persistent SRS after being activated, and it remains activated until it is deactivated. Semi-Persistent SRS requires activation via MAC CE to take effect, and can also be deactivated via MAC CE to become invalid.

[0049] Non-periodic SRS:

[0050] Aperiodic SRS is sent by the terminal after being dynamically triggered by DCI. The bandwidth, frequency domain location, transmission tree structure, etc. of aperiodic SRS are also configured in advance through RRC.

[0051] Physical Uplink Shared Channel (PUSCH) for Non-Codebook Transmission:

[0052] In the non-codebook transmission mode of a 5G NR system, the terminal can send one or more precoded SRS signals to determine the beam precoding of the uplink data channel. The base station configures the terminal to use the precoding of the SRS corresponding to the SRI as the precoding for the PUSCH by indicating a Scheduling Request Indicator (SRI). The SRI can be configured using Downlink Control Information (DCI) formats 0_0, 0_1, 0_2, 0_3 or semi-static parameters srs-ResourceIndicator and srs-ResourceIndicator2. For uplink multi-stream transmission, the SRI for each PUSCH precoding is indicated separately.

[0053] The network configures an SRS resource set for the terminal, which contains one or more SRS resources. The terminal uses the SRS resources in the SRS resource set to transmit precoded SRS. Depending on the terminal's capabilities, the maximum number of SRS resources that the SRS resource set can contain is 1, 2, 4, or 8. The precoding corresponding to the SRI is the precoding used by the SRS resource of the most recent transmission unit before the transmission of the Physical Downlink Control Channel (PDCCH) carrying the SRI.

[0054] In non-codebook transmission mode, the terminal device calculates the SRS precoding based on downlink channel measurements. These downlink channel measurements are obtained through measurements of the associated NZP CSI-RS. Existing protocols specify that one SRS resource set is associated with one NZP CSI-RS resource, configured in the RRC message SRS-ResourceSet. The terminal determines several SRS precodings based on the downlink channel measurements, which are used for SRS signal transmission of the SRS resources within the SRS resource set.

[0055] Transmission of aperiodic SRS is scheduled via DCI, and its associated downlink reference signal (such as CSI-RS) is indicated through the SRS request field. The network is configured with AperiodicSRS-ResourceTriggerList, which contains AperiodicSRS-ResourceTriggers, each representing a parameter combination (including SRS trigger state, SRS resource set ID, and NZP CSI-RS resource ID). The corresponding SRS resource set and associated NZP CSI-RS are scheduled by indicating the SRS trigger state. Aperiodic SRS can also be associated with aperiodic NZP CSI-RS, requiring the aperiodic CSI-RS and DCI to be in the same time slot.

[0056] For periodic or semi-static SRS, the associated NZP CSI-RS is configured on the associatedCSI-RS parameter of the RRC signaling SRS-ResourceSet.

[0057] Antenna-switched SRS:

[0058] Antenna-switching-based Supported Resource Sets (SRS) are used for Physical Downlink Shared Channel (PDSCH) transmission. The network side configures an SRS resource set for antenna switching on the terminal. By measuring the SRS, the network side obtains the uplink channel and, based on the channel exclusivity assumption, assumes that the downlink channel transmitted via PDSCH is consistent with the measured uplink channel. Therefore, transmission parameters are obtained based on the PDSCH channel.

[0059] Terminals can report antenna switching capabilities according to their own implementation methods, including 1T2R, 2T4R, 1T4R, and xTxR (x = 1, 2, 4), where T represents the transmitting port and R represents the receiving port. When the transmitting port equals the receiving port (xTxR, x = 1, 2, 4), the network side can configure the number of ports in each SRS resource set to equal x, and the network side can obtain the downlink transmission channel by measuring one SRS resource. When the number of transmitting ports is less than the number of receiving ports, the network side needs to measure multiple SRS resources to obtain the downlink transmission channel. Taking 2T4R as an example, the UE has 4 receiving ports but only 2 transmitting ports. In order for the network side to obtain the downlink channel when receiving from all 4 receiving ports, the network side will configure at least two SRS resources, where each resource corresponds to two SRS ports, and the two SRS resources are associated with different antenna ports. At position l0 of OFDM symbol l0 in slot n, the UE sends an SRS associated with antenna ports 0 and 1, and at position l2 of OFDM symbol l2 in slot n+1, the UE sends an SRS associated with antenna ports 2 and 3. The network side can obtain the 4RX channel by measuring these two SRS.

[0060] Uplink antenna port number:

[0061] The following are the uplink antenna port numbers as agreed in the protocol.

[0062] The following antenna ports are defined for the uplink:

[0063] Antenna ports starting with 0 for demodulation reference signals for PUSCH

[0064] Antenna ports starting with 1000 for SRS,PUSCH

[0065] Antenna ports starting with 2000 for PUCCH

[0066] Antenna port 4000 for PRACH

[0067] CSI-RS port overhead is reduced:

[0068] In 6G, to improve downlink resource utilization, it is necessary to reduce CSI-RS port overhead. One potential CSI-RS transmission scheme involves the base station intermittently transmitting CSI-RS data for both the large and small ports to reduce CSI-RS port overhead. Furthermore, the UE determines the correlation between CSI-RS ports based on the large port CSI-RS data, and calculates and feeds back the large port CSI-RS data based on the measured data and the pre-determined CSI-RS port correlation when measuring the small port CSI-RS data.

[0069] Currently, in scenarios where the base station intermittently transmits CSI-RS from both the large and small ports, it remains unclear how Non-codebook SRS is measured based on CSI-RS. Using existing technology, it's possible that the UE calculates the precoding information for SRS based on the small port CSI-RS, while the base station receives the SRS using the large port, or vice versa, impacting uplink transmission performance.

[0070] Generally, the UE uses a large port to compute the precoder and perform uplink transmission, while the base station uses a small port to receive the data. Due to the mismatch in channel information utilization between the UE and the base station, performance is poor in this case. Alternatively, the UE may use a small port to compute the precoder and perform uplink transmission, while the base station uses a small port to receive the data; or vice versa. Again, due to the mismatch in channel information utilization between the UE and the base station, performance is poor; or the UE may use a large port to compute the precoder and perform uplink transmission, while the base station uses a large port to receive the data.

[0071] Furthermore, from the perspective of uplink reception in Multi-User Multiple-Input Multiple-Output (MU MIMO), for two paired UEs, the channels (or correlation matrices of the base station receiving antennas) of the two UEs should be as orthogonal as possible. When UE1 and UE2 use the same base station-side antenna ports to calculate non-codebook SRS, it is easier to achieve orthogonality between the two UE channels. Therefore, to ensure the orthogonality of the channels between paired MU-MIMO UEs, the UEs should not be allowed to arbitrarily determine the SRS precoder based on different numbers of CSI-RS antenna ports.

[0072] In summary, in the scenario of "intermittent CSI-RS transmission from the base station to the large port and CSI-RS transmission from the small port", how to solve the problem of CSI-RS measurement by Non-codebook SRS in order to avoid mismatch between UE transmission and base station reception is an issue to be addressed.

[0073] The communication method provided in this application will be described in detail below with reference to the accompanying drawings and through some embodiments and application scenarios.

[0074] Figure 2 is a flowchart illustrating the communication method provided in an embodiment of this application. As shown in Figure 2, the communication method may include the following step 201:

[0075] Step 201: The terminal device sends a non-codebook probe reference signal (SRS), the precoding information of which is determined based on the first downlink reference signal or the second downlink reference signal.

[0076] Wherein, the number of ports of the first downlink reference signal is greater than the number of ports of the second downlink reference signal, and the antenna ports associated with the first downlink reference signal include the antenna ports associated with the second downlink reference signal.

[0077] It can be understood that some ports of the first downlink reference signal are associated with the same antenna ports as the ports of the second downlink reference signal, or that some ports of the first downlink reference signal are the same ports as the ports of the second downlink reference signal.

[0078] In some embodiments of this application, the first downlink reference signal includes, but is not limited to, CSI-RS and demodulation reference signal (DMRS); the second downlink reference signal includes, but is not limited to, CSI-RS and DMRS.

[0079] It should be noted that the specific types of the first downlink reference signal and the second downlink reference signal can be determined according to the actual application scenario and specific requirements, and this application embodiment does not limit this.

[0080] Optionally, the first downlink reference signal and the second downlink reference signal can be the same type of downlink reference signal. For example, both can be CSI-RS, such as the first downlink reference signal being a large-port or full-port CSI-RS, and the second downlink reference signal being a small-port or partial-port CSI-RS.

[0081] Optionally, the first downlink reference signal and the second downlink reference signal can be different types of downlink reference signals. For example, the first downlink reference signal is CSI-RS, and the second downlink reference signal is DMRS (such as PDSCH DMRS), where the number of antenna ports associated with DMRS is less than that of CSI-RS, and the antenna ports associated with CSI-RS include the antenna ports associated with DMRS.

[0082] In some embodiments of this application, the above-mentioned non-codebook SRS refers to the non-codebook SRS.

[0083] Understandably, in non-codebook transmission mode, the terminal device determines the precoding information for the SRS itself and applies this precoding information to the SRS transmission. Upon receiving the SRS, the network-side device performs uplink scheduling based on signal quality, without needing to select precoding information from the codebook.

[0084] In some embodiments of this application, the aforementioned non-codebook SRS is an SRS in an SRS resource set; the SRS resource set is configured by the network-side device and contains one or more SRS resources.

[0085] It should be noted that "non-codebook SRS" in the embodiments of this application can be replaced by "non-codebook SRS", "Non-codebook SRS" or "SRS".

[0086] In some embodiments of this application, the precoding information may include a precoding matrix or a precoding vector.

[0087] It should be noted that in a Multiple Input Multiple Output (MIMO) system, the precoding matrix can be applied to multiple transmit antennas to optimize signal transmission on multiple spatial paths.

[0088] It should be noted that precoding information refers to information from the precoder. A precoder is specifically a series of algorithms or matrices used to preprocess the transmitted signal to optimize its transmission performance in the channel.

[0089] In some embodiments of this application, the first downlink reference signal and the second downlink reference signal may be received at different times, and the first downlink reference signal, the second downlink reference signal and the non-codebook SRS are received on the same carrier.

[0090] In some embodiments of this application, the port of the first downlink reference signal is associated with all antenna ports of the network-side device; the port of the second downlink reference signal is associated with some antenna ports of the network-side device; or the number of antenna ports of the network-side device associated with the port of the first downlink reference signal is greater than the number of antenna ports of the network-side device associated with the port of the second downlink reference signal.

[0091] It should be noted that the port for the downlink reference signal is a logical port used to transmit the downlink reference signal.

[0092] It should be noted that all antenna ports, i.e., large antenna ports (large ports) or complete antenna ports, refer to those mapped to a larger number of physical antenna elements. Large ports are typically used to provide complete channel estimation. Partial antenna ports, i.e., small antenna ports (small ports), refer to those mapped to a smaller number of physical antenna elements. Small ports are typically used to provide local channel estimation.

[0093] In some embodiments of this application, the first downlink reference signal and the second downlink reference signal are associated.

[0094] In some embodiments of this application, the first downlink reference signal and the second downlink reference signal are transmitted by the network-side device before the non-codebook SRS.

[0095] In some embodiments of this application, the first downlink reference signal is the most recent CSI-RS preceding the second downlink reference signal.

[0096] In some embodiments of this application, the terminal device may use the first downlink reference signal or the second downlink reference signal as a reference signal (reference DL RS) for non-codebook SRS transmission, and determine the precoding information of SRS based on the first downlink reference signal or the second downlink reference signal, and then apply the precoding information to the transmission of SRS.

[0097] The communication method provided in this application embodiment involves a terminal device transmitting a non-codebook SRS. The precoding information of the non-codebook SRS is determined based on a first downlink reference signal or a second downlink reference signal. The first downlink reference signal has a greater number of ports than the second downlink reference signal, and the antenna ports associated with the first downlink reference signal include the antenna ports associated with the second downlink reference signal. Through this method, the terminal device can determine the precoding information of the SRS based on the first downlink reference signal or the second downlink reference signal, thereby avoiding mismatch between the terminal device's transmission and the network-side device's reception in non-codebook-based uplink transmission scenarios and ensuring transmission performance.

[0098] In some embodiments of this application, step A3 may be included before step 201 above:

[0099] Step A3: The terminal device determines the precoding information of the non-codebook SRS based on the first downlink reference signal or the second downlink reference signal.

[0100] In some embodiments of this application, step A3 may include step A1 or step A2:

[0101] Step A1: The terminal device determines the precoding information of the non-codebook SRS based on the first channel information.

[0102] The aforementioned first channel information refers to the information of the channel associated with the antenna port of the first downlink reference signal.

[0103] Step A2: The terminal device determines the precoding information of the non-codebook SRS based on the second channel information.

[0104] The second channel information mentioned above refers to the channel associated with the antenna port of the second downlink reference signal.

[0105] In some embodiments of this application, the terminal device can determine the precoding information of the non-codebook SRS based on the channel associated with the antenna port of the first downlink reference signal.

[0106] It should be noted that "the channel associated with the antenna port of the first downlink reference signal" can be understood as "the channel associated with the large port", "the channel associated with all ports" or "the channel of the large port"; "the channel associated with the antenna port of the second downlink reference signal" can be understood as "the channel associated with the small port", "the channel associated with some ports" or "the channel of some ports".

[0107] In some embodiments of this application, the aforementioned first channel information is determined based on at least one of the following:

[0108] Measurement information of the aforementioned first downlink reference signal;

[0109] The measurement information of the aforementioned second downlink reference signal;

[0110] Antenna port correlation information, which is determined based on the measurement information of the first downlink reference signal.

[0111] In some embodiments of this application, the measurement information of the first downlink reference signal may include at least one of the following: antenna port channel information (or large port channel information, or full port channel information) associated with the first downlink reference signal at the transmission time (or transmission time instance) of the first downlink reference signal.

[0112] In some embodiments of this application, the measurement information of the second downlink reference signal can be the channel information (or small port channel information, or full port channel information) of the antenna port associated with the second downlink reference signal at the time of transmission of the second downlink reference signal.

[0113] In some embodiments of this application, the antenna port correlation information may include at least one of the following: the covariance matrix of the large-port channel, the covariance matrix between the large-port channel and the small-port channel, the covariance matrix between the small-port channels, and the channel transformation matrix between the large-port and small-port channels. Optionally, the covariance matrix between the large-port channel and the small-port channel, and the covariance matrix between the small-port channels, can be extracted from the covariance matrix of the large-port channel; the channel transformation matrix between the large-port and small-port channels can be determined based on the covariance matrix between the large-port channel and the small-port channel and the covariance matrix between the small-port channels. Optionally, the aforementioned "covariance matrix" can also be understood as a "correlation matrix".

[0114] Optionally, the correlation of the aforementioned antenna ports can be determined based on the measurement information of the first downlink reference signal.

[0115] It is understood that at the time of the first downlink reference signal, the first channel information can be directly determined by the measurement information of the first downlink reference signal; at the time of the second downlink reference signal, the first channel information is jointly determined by the measurement information of the first downlink reference signal, the measurement information of the second downlink reference signal, and the antenna port correlation information (or, jointly determined by the measurement information of the first downlink reference signal, the measurement information of the second downlink reference signal, or jointly determined by the measurement information of the two downlink reference signals and the antenna port correlation information).

[0116] In some possible examples, the terminal device can directly measure the channel of the large port based on the first downlink reference signal and calculate the precoding information of the SRS based on the measurement information.

[0117] In some possible examples, the terminal device measures the second downlink reference signal to obtain the channel of a portion of the port, and obtains the correlation information between the ports (i.e., antenna port correlation information) based on the previous first downlink reference signal. Then, based on the channel of the portion of the port and the correlation information between the ports, it determines the channel of the large port (e.g., the channel of the large port at the time of transmission of the second downlink reference signal), and calculates the precoding information of the non-codebook SRS based on the channel of the large port.

[0118] In some embodiments of this application, the communication method may include steps 202 and 203:

[0119] Step 202: The terminal device receives the first instruction information.

[0120] Step 203: The terminal device determines, according to the first instruction information, that the first downlink reference signal or the second downlink reference signal is the target downlink reference signal associated with the non-codebook SRS, and the precoding information of the aforementioned non-codebook SRS is determined based on the target downlink reference signal.

[0121] The aforementioned first instruction information indicates any of the following:

[0122] The aforementioned first downlink reference signal serves as the associated downlink reference signal for the aforementioned non-codebook SRS;

[0123] The aforementioned second downlink reference signal serves as the associated downlink reference signal for the aforementioned non-codebook SRS;

[0124] Both the first downlink reference signal and the second downlink reference signal mentioned above can be used as associated downlink reference signals for the non-codebook SRS.

[0125] It is understandable that the associated downlink reference signal of the non-codebook SRS is the associated CSI-RS of the SRS.

[0126] In some embodiments of this application, when the first indication information indicates that the second downlink reference signal is an associated downlink reference signal of a non-codebook SRS, the second downlink reference signal is associated with the first downlink reference signal; or, when the first indication information indicates that the first downlink reference signal is an associated downlink reference signal of a non-codebook SRS, the first downlink reference signal is associated with the second downlink reference signal. In other words, when the second downlink reference signal is an associated downlink reference signal of the aforementioned non-codebook SRS, the second downlink reference is associated with the first reference signal (or, associated with at least one first reference signal); or, when the first downlink reference signal is an associated downlink reference signal of the aforementioned non-codebook SRS, the first downlink reference is associated with the second downlink reference signal (or, associated with at least one second reference signal). Optionally, the association relationship or the downlink reference signal with the association relationship can be determined by at least one of the first indication information, the third indication information, and the protocol agreement, wherein the third indication information is indication information different from the first indication information.

[0127] In some possible examples, the network-side device indicates that the first downlink reference signal is associated with the SRS and indicates that the second downlink reference signal is associated with the first downlink reference signal.

[0128] In some possible examples, the network-side device indicates that the second downlink reference signal is associated with the SRS and indicates that the second downlink reference signal is associated with the first downlink reference signal.

[0129] In some possible examples, the network-side device indicates that both the first downlink reference signal and the second downlink reference signal can be used as the associated downlink reference signal for the SRS. For example, the network indicates that both the first downlink reference signal and the second downlink reference signal can be used as the associated downlink reference signal for the SRS; one corresponding approach is that the network indicates that the two ID information are associated with either the first downlink reference signal or the second downlink reference signal, respectively.

[0130] In some embodiments of this application, the aforementioned first indication information is carried by Radio Resource Control (RRC) signaling, or Medium Access Control Control Element (MAC CE) or Downlink Control Information (DCI).

[0131] In some examples, higher-level signaling, such as RRC, instructs the associated downlink reference signal of this SRS to be one of the first downlink reference signal or the second downlink reference signal.

[0132] In some examples, the DCI signaling (such as the first DCI) indicates, for example, that the SRS is aperiodic, that the associated downlink reference signal of the SRS in the DCI that triggers the SRS (i.e. carries an SRS request) is one of the first downlink reference signal or the second downlink reference signal.

[0133] In some possible examples, the terminal device can determine the first downlink reference signal or the second downlink reference signal as the target downlink reference signal associated with the SRS based on the CSI-RS resource identifier (i.e., CSI-RS resource ID) or the CSI-RS resource set identifier (i.e., CSI-RS resource set ID).

[0134] For example, the first downlink reference signal and the second downlink reference signal are associated with different ID information, such as CSI-RS resource ID or CSI-RS resource set ID. The terminal device determines the associated downlink reference signal of the SRS as either the first downlink reference signal or the second downlink reference signal based on the ID of the associated CSI-RS of the SRS.

[0135] In some embodiments of this application, the second downlink reference signal can be used at least by the terminal device to determine the channel information of a portion of the ports.

[0136] As a possible example, steps 202 and 203 can be performed before step 201 described above.

[0137] In some embodiments of this application, the process by which the terminal device determines the precoding information of the non-codebook SRS based on the first downlink reference signal or the second downlink reference signal can be implemented by at least one of the following steps 201a to 201c.

[0138] Step 201a: When the second downlink reference signal is used as the associated downlink reference signal of the non-codebook SRS, the terminal device determines the information of the channel associated with the antenna port based on the first downlink reference signal according to the protocol agreement or the second indication information, and determines the precoding information of the non-codebook SRS.

[0139] The second downlink reference signal is associated with the first downlink reference signal, or the first downlink reference signal is associated with the second downlink reference signal, meaning that the first downlink reference signal and the second downlink reference signal are associated.

[0140] Optionally, the aforementioned relationship or related downlink reference signal may be determined by at least one of the following: second indication information, other indication information, or agreement.

[0141] Step 201b: When both the first downlink reference signal and the second downlink reference signal can be used as the associated downlink reference signal of the non-codebook SRS, the terminal device determines the information of the channel associated with the antenna port based on the first downlink reference signal according to the protocol agreement or the second indication information, and determines the precoding information of the non-codebook SRS.

[0142] Step 201c: When the first downlink reference signal is used as the associated downlink reference signal of the non-codebook SRS, the terminal device determines the information of the channel associated with the antenna port based on the first downlink reference signal according to the protocol or the second indication information, and determines the precoding information of the non-codebook SRS.

[0143] The aforementioned second instruction information can be carried via RRC signaling, MAC CE, or DCI.

[0144] The first downlink reference signal and the second downlink reference signal mentioned above are correlated. This correlation, or the correlation between the downlink reference signals, can be agreed upon by a protocol or indicated by the network.

[0145] In some possible examples, the network-side device designates a second downlink reference signal as the associated downlink reference signal for the SRS, wherein the second downlink reference signal is associated with the first downlink reference signal. Further, the terminal device can determine the precoding information of the non-codebook SRS based on the channel associated with the antenna port of the first downlink reference signal, according to network instructions or protocol agreements.

[0146] In some possible examples, the network-side device indicates that both the first downlink reference signal and the second downlink reference signal can be used as associated downlink reference signals for the SRS, wherein the second downlink reference signal is associated with the first downlink reference signal. Furthermore, the terminal device can determine the precoding information of the SRS based on the channel associated with the antenna port of the first downlink reference signal, according to network instructions or protocol agreements.

[0147] In some possible examples, the network-side device designates a first downlink reference signal as the associated downlink reference signal for the SRS, wherein the first downlink reference signal is associated with a second downlink reference signal. Further, the terminal device determines the precoding information of the SRS based on the channel associated with the antenna port of the first downlink reference signal.

[0148] In some examples, higher-layer signaling (such as RRC) indicates that both the first downlink reference signal and the second downlink reference signal can be used as associated downlink reference signals for the SRS. When the DCI (such as the first DCI) triggers the SRS, the DCI simultaneously instructs the channel associated with the antenna port of the first downlink reference signal to determine the precoding information of the SRS. Furthermore, in the case where the non-codebook SRS is aperiodic, when the DCI triggers the SRS, the DCI simultaneously instructs the channel associated with the antenna port of the first downlink reference signal to determine the precoding information of the SRS.

[0149] In some examples, when DCI triggers SRS, it can simultaneously trigger both an aperiodic first downlink reference signal and a second downlink reference signal. Both serve as associated SRS and precoding information indicating the channel-determined SRS based on the antenna port associated with the first downlink reference signal. Furthermore, when the non-codebook SRS is aperiodic, when DCI triggers SRS, it simultaneously triggers both an aperiodic first downlink reference signal and a second downlink reference signal, both serving as associated SRS.

[0150] For example, the first downlink reference signal may be located before the second downlink reference signal.

[0151] For example, the time slot relationship between the first downlink reference signal or the second downlink reference signal and the SRS request includes at least one of the following:

[0152] The second downlink reference signal is located in the same time slot as the SRS request;

[0153] Both the first downlink reference signal and the second downlink reference signal are located in the same time slot as the SRS request;

[0154] The second downlink reference signal is located in an adjacent time slot as the first downlink reference signal, or in a time slot separated by a certain time gap. The first downlink reference signal or the second downlink reference signal is located in the same time slot as the SRS request.

[0155] In this embodiment, the terminal device can use either the first downlink reference signal or the second downlink reference signal as the associated downlink reference signal of the SRS, and select the information of the channel associated with the antenna port of the first downlink reference signal to determine the precoding information according to the protocol agreement or the instruction of the network side device. This enables the terminal device to select a suitable CSI-RS as a reference under different communication scenarios and channel conditions, thereby more accurately determining the precoding information and improving the efficiency and reliability of data transmission.

[0156] In some embodiments of this application, the second indication information above indicates that the precoding information of the non-codebook SRS is calculated based on the channel information associated with the antenna port of the first downlink reference signal, and the terminal device calculates the precoding information of the non-codebook SRS based on the channel information associated with the antenna port of the first downlink reference signal.

[0157] Alternatively, if the second indication information does not indicate that the precoding information of the non-codebook SRS is calculated based on the first downlink reference signal, the terminal device calculates the precoding information of the non-codebook SRS based on the second downlink reference signal, or the terminal device calculates the precoding information of the SRS based on the port of the CSI-RS indicated by the DCI.

[0158] In some possible examples, if the network-side device (such as DCI) does not instruct the calculation of precoding information for non-codebook SRS based on channel information associated with the antenna port of the first downlink reference signal, the terminal device calculates precoding information for non-codebook SRS based on channel information associated with the antenna port of the second downlink reference signal.

[0159] In some embodiments of this application, the aforementioned non-codebook SRS is aperiodic and associated with aperiodic second downlink reference signal;

[0160] Among them, the aforementioned aperiodic non-codebook SRS is triggered by the first DCI, and the first DCI simultaneously triggers the aperiodic second downlink reference signal;

[0161] The aforementioned aperiodic second downlink reference signal is associated with the first downlink reference signal.

[0162] It should be noted that the first DCI simultaneously triggers the aperiodic second downlink reference signal, which can be understood as the first DCI indicating the existence of the aperiodic second downlink reference signal.

[0163] In some possible examples, when the first DCI triggers SRS, it simultaneously triggers an aperiodic second downlink reference signal as the associated downlink reference signal for SRS. Further, the first DCI may simultaneously indicate, or be indicated by higher-layer RRC, or be protocol-defined by the UE to calculate the precoded information for SRS based on the first CSI port.

[0164] As shown in Figure 3, the DCI (such as the first DCI) triggers the SRS (i.e., the non-codebook SRS) and the second downlink reference signal (i.e., 2). nd CSI-RS), the second downlink reference signal and the first downlink reference signal (i.e., 1) nd The CSI-RS is associated with the terminal device, which will calculate the SRS precoder based on the port of the first downlink reference signal.

[0165] It should be noted that when an aperiodic SRS is triggered, the associated downlink reference signal of the aperiodic SRS is also triggered. However, to reduce resource overhead, only the aperiodic second downlink reference signal is triggered. For example, if there happens to be a periodically transmitted first downlink reference signal nearby, the second downlink reference signal of the small port can be triggered; if there is no first downlink reference signal nearby, the first downlink reference signal can be triggered directly.

[0166] In some embodiments of this application, the first downlink reference signal associated with the aforementioned aperiodic second downlink reference signal is periodic or semi-continuous; in other words, the aperiodic second downlink reference signal is associated with a periodic or semi-continuous first downlink reference signal.

[0167] In some embodiments of this application, the aforementioned non-codebook SRS is aperiodic, and is associated with an aperiodic second downlink reference signal and an aperiodic first downlink reference signal.

[0168] The aforementioned aperiodic SRS is triggered by the first DCI, and the first DCI simultaneously triggers the aperiodic second downlink reference signal and the aforementioned aperiodic first downlink reference signal.

[0169] In some possible examples, when the first DCI triggers SRS, it simultaneously triggers an aperiodic second downlink reference signal and an aperiodic first downlink reference signal as associated downlink reference signals for SRS. Further, the first DCI may simultaneously indicate, or be indicated by higher-layer RRC, or be agreed upon by the protocol for the UE to calculate the precoded information of SRS based on the first CSI port.

[0170] As shown in Figure 4, taking the first downlink reference signal as the first CSI-RS and the second downlink reference signal as the second CSI-RS as an example, the DCI (such as the first DCI) triggers the SRS (i.e., the non-codebook SRS), and the first downlink reference signal (i.e., 1) triggers the SRS (i.e., the non-codebook SRS). nd CSI-RS) and the second downlink reference signal (i.e., 2)nd The first downlink reference signal (CSI-RS) and the second downlink reference signal are related. The terminal device will calculate the SRS precoder based on the port of the first downlink reference signal.

[0171] In some embodiments of this application, the second downlink reference signal and the first DCI may be located in the same slot, the first DCI carrying an SRS request, which is used to trigger an aperiodic noncodebook SRS.

[0172] In some possible examples, the second downlink reference signal is located in the same time slot as the SRS request, where the SRS request is located in the field that triggers the aperiodic SRS in the first DCI.

[0173] In some embodiments of this application, the process by which the terminal device determines the precoding information of the aforementioned non-codebook SRS based on the first downlink reference signal or the second downlink reference signal can be implemented through the following step 202a1.

[0174] Step 202a1: The terminal device determines the precoding information of the above-mentioned non-codebook SRS based on the first timing information, either the first downlink reference signal or the second downlink reference signal.

[0175] The first timing information includes the timing relationship between the first downlink reference signal, the second downlink reference signal, and at least two of the non-codebook SRS.

[0176] In some embodiments of this application, the terminal device can determine the precoding information of the non-codebook SRS based on the channel associated with the antenna port of the first downlink reference signal or the channel associated with the antenna port of the second downlink reference signal, according to the timing relationship between the first downlink reference signal and the non-codebook SRS, or according to the timing relationship between the second downlink reference signal and the non-codebook SRS, or according to the timing relationship between the first downlink reference signal, the second downlink reference signal and the non-codebook SRS.

[0177] It should be noted that the timing information of a signal refers to the relative arrangement of signals in the time dimension, which may include at least one of time intervals (such as the receiving time interval) and sequence (such as the order of receiving signals).

[0178] In some embodiments of this application, the terminal device may, when it is determined that both the first downlink reference signal and the second downlink reference signal can be used for the calculation of precoding information, determine, based on the first timing information, the precoding information of the aforementioned non-codebook SRS based on the first downlink reference signal or the second downlink reference signal.

[0179] In some examples, both the first downlink reference signal and the second downlink reference signal can be used to calculate the precoded information, determined according to one of the following:

[0180] The network indicates that both the first downlink reference signal and the second downlink reference signal can be used as the associated downlink reference signal of the SRS;

[0181] The network indicates that the first downlink reference signal is used as the associated downlink reference signal of the SRS, and the first downlink reference signal is associated with the second downlink reference signal;

[0182] The network indicates that the second downlink reference signal is used as the associated downlink reference signal of the SRS, and the first downlink reference signal and the second downlink reference signal are associated.

[0183] In some embodiments of this application, the first timing information described above further includes at least one of the following:

[0184] The time gap between the first downlink reference signal and the non-codebook SRS;

[0185] The time interval between the second downlink reference signal and the non-codebook SRS;

[0186] The time interval between the first downlink reference signal and the second downlink reference signal.

[0187] In some embodiments of this application, step 202a1 may include step 202a2 or step 202a3:

[0188] Step 202a2: When the first condition is met, the terminal device determines the precoding information of the above-mentioned non-codebook SRS based on the first downlink reference signal.

[0189] For example, when any of the conditions in the first set of conditions is met, the terminal device determines the precoding information of the aforementioned non-codebook SRS based on the first downlink reference signal.

[0190] Step 202a3: When the second condition is met, the terminal device determines the precoding information of the non-codebook SRS based on the second downlink reference signal.

[0191] For example, when all the conditions in the second condition group are met, the terminal device determines the precoding information of the non-codebook SRS based on the second downlink reference signal.

[0192] In some embodiments of this application, the first condition mentioned above includes any one of the following:

[0193] Condition 1: The time interval between the first downlink reference signal and the non-codebook SRS is greater than or equal to the first threshold, and / or the time interval between the first downlink reference signal and the non-codebook SRS is less than or equal to the second threshold;

[0194] Condition 2: The time interval between the first downlink reference signal and the non-codebook SRS is less than the first threshold or greater than the second threshold, and the second downlink reference signal satisfies the third condition or satisfies at least one condition in the third condition group.

[0195] In some embodiments of this application, the first set of conditions described above includes the following conditions:

[0196] The time interval between the first downlink reference signal and the non-codebook SRS is greater than or equal to a first threshold, and / or the time interval between the first downlink reference signal and the non-codebook SRS is less than or equal to a second threshold.

[0197] The time interval between the first downlink reference signal and the non-codebook SRS is less than the first threshold or greater than the second threshold, and the second downlink reference signal satisfies at least one condition in the third condition group.

[0198] In some embodiments of this application, the third condition described above includes at least one of the following:

[0199] The time interval between the second downlink reference signal and the non-codebook SRS is greater than or equal to the first threshold mentioned above, and / or the time interval between the second downlink reference signal and the non-codebook SRS is less than or equal to the second threshold.

[0200] The second downlink reference signal is associated with the first downlink reference signal;

[0201] The first downlink reference signal is sent before the second downlink reference signal, and the time interval between the first downlink reference signal and the second downlink reference signal is greater than or equal to a third threshold, and / or the time interval between the first downlink reference signal and the aforementioned second downlink reference signal is less than or equal to a fourth threshold.

[0202] In some embodiments of this application, the third condition group mentioned above includes the following conditions:

[0203] The time interval between the second downlink reference signal and the non-codebook SRS is greater than or equal to the first threshold mentioned above, and / or the time interval between the second downlink reference signal and the non-codebook SRS is less than or equal to the second threshold.

[0204] The second downlink reference signal is associated with the first downlink reference signal;

[0205] The first downlink reference signal is sent before the second downlink reference signal, and the time interval between the first downlink reference signal and the second downlink reference signal is greater than or equal to a third threshold, and / or the time interval between the first downlink reference signal and the aforementioned second downlink reference signal is less than or equal to a fourth threshold.

[0206] In some embodiments of this application, the second condition described above includes at least one of the following:

[0207] Condition 3: The time interval between the first downlink reference signal and the non-codebook SRS is less than the first threshold, and / or the time interval between the first downlink reference signal and the aforementioned non-codebook SRS is greater than the second threshold;

[0208] Condition 4: The time interval between the first downlink reference signal and the non-codebook SRS is less than the first threshold or greater than the second threshold mentioned above, and the second downlink reference signal does not satisfy any of the conditions in the third condition group.

[0209] The time interval between the second downlink reference signal and the non-codebook SRS is greater than or equal to the fifth threshold mentioned above, and / or less than or equal to the sixth threshold.

[0210] In some embodiments of this application, the second set of conditions described above includes the following conditions:

[0211] The time interval between the first downlink reference signal and the non-codebook SRS is less than a first threshold, and / or the time interval between the first downlink reference signal and the aforementioned non-codebook SRS is greater than a second threshold.

[0212] The time interval between the first downlink reference signal and the non-codebook SRS is less than the first threshold or greater than the second threshold, and the second downlink reference signal does not satisfy any of the conditions in the third condition group.

[0213] The time interval between the second downlink reference signal and the non-codebook SRS is greater than or equal to the fifth threshold mentioned above, and / or less than or equal to the sixth threshold.

[0214] In some possible examples, if the time gap between the first downlink reference signal and the non-codebook SRS is greater than or equal to a first threshold and / or less than or equal to a second threshold, the terminal device determines the precoding information of the SRS based on the channel associated with the antenna port of the first downlink reference signal.

[0215] In some possible examples, if the time gap between the first downlink reference signal and the SRS is less than a first threshold or greater than a second threshold, but at least one condition in the third condition group is met, the terminal device determines to calculate the precoding information of the SRS based on the channel associated with the first downlink reference signal port.

[0216] In some examples, if the time gap between the second downlink reference signal and the SRS is greater than or equal to a first threshold, and / or less than or equal to a second threshold; the second downlink reference signal has a first downlink reference signal associated with it; and the timeline relationship between the first downlink reference signal and the second downlink reference signal satisfies the following: the first downlink reference signal precedes the second downlink reference signal; the time gap between the first downlink reference signal and the second downlink reference signal is greater than or equal to a third threshold, and / or less than or equal to a fourth threshold, then the terminal device determines the precoding information of the SRS based on the channel associated with the first downlink reference signal port.

[0217] In some possible examples, if the second condition is met, the UE determines the precoding information of the SRS based on the channel associated with the second downlink reference signal port.

[0218] In some embodiments, when all conditions in the second set of conditions are met, the UE determines the precoding information of the SRS based on the channel associated with the second downlink reference signal port.

[0219] In some embodiments, if none of the conditions in the first condition group are met, and the time interval between the second downlink reference signal and the non-codebook SRS is greater than or equal to the fifth threshold and the time interval between the second downlink reference signal and the non-codebook SRS is less than or equal to the sixth threshold, the UE determines the precoding information of the SRS based on the channel associated with the second downlink reference signal port.

[0220] In some examples, if neither condition 1 nor condition 2 is satisfied, and the time interval between the second downlink reference signal and the non-codebook SRS is greater than or equal to the fifth threshold and / or less than or equal to the sixth threshold, the UE determines the precoding information of the SRS based on the channel associated with the second downlink reference signal port.

[0221] In some examples, if both conditions 3 and 4 above are met, and the time interval between the second downlink reference signal and the non-codebook SRS is greater than or equal to the fifth threshold and less than or equal to the sixth threshold, the UE determines the precoding information of the SRS based on the channel associated with the second downlink reference signal port.

[0222] It should be noted that the thresholds (such as the first threshold) in the embodiments of this application can be set according to actual needs, and the embodiments of this application do not limit this.

[0223] In the embodiments of this application, the terminal device can evaluate the channel state based on the timing relationship between the first downlink reference signal, the second downlink reference signal and the SRS, so as to more accurately select the CSI-RS used to determine the SRS precoding, thereby improving the accuracy of precoding and thus improving the efficiency and reliability of data transmission.

[0224] In some embodiments of this application, step 202b above may include step 202b3:

[0225] Step 202b3: When neither the first condition nor the second condition is met, the terminal device determines the precoding information determined by the third downlink reference signal as the precoding information of the non-codebook SRS, or does not expect to update the precoding information of the non-codebook SRS.

[0226] The aforementioned third downlink reference signal is a downlink reference signal other than the first downlink reference signal and the second downlink reference signal.

[0227] In some examples, when all conditions in the first condition group are not met and all conditions in the second condition group are not met, the terminal device determines the precoding information determined by the third downlink reference signal as the precoding information of the non-codebook SRS, or does not expect to update the precoding information of the non-codebook SRS.

[0228] It should be noted that the explanation of the first and second conditions can be found in the descriptions in the above embodiments, and will not be repeated here.

[0229] For example, if any condition in the first condition group is not met and none of the conditions in the second condition group are met, the terminal device ignores the SRS precoding information update.

[0230] In some embodiments of this application, the communication method may further include the following step 204:

[0231] Step 204: The terminal device reports the second information.

[0232] The aforementioned second information is used to indicate the port information of the downlink reference signal used to determine the precoding information of the non-codebook SRS.

[0233] In some embodiments of this application, the port information described above may include the number of ports.

[0234] In some embodiments of this application, when the terminal device determines the precoding information of SRS based on the first downlink reference signal or the second downlink reference signal, it can be used to determine the port information of CSI-RS of the precoding information of SRS.

[0235] In some embodiments of this application, the network-side device can receive the second information from the terminal device.

[0236] In this embodiment, the terminal device reports port information for determining non-codebook SRS precoding information, enabling the network-side device to accurately understand the reference signal information used by the terminal device to determine the SRS precoding information, thereby accurately scheduling resources and improving overall communication efficiency.

[0237] The communication method provided in the embodiments of this application will be described by way of example below.

[0238] In some possible examples, taking the terminal device as a UE, the communication method may include the following steps:

[0239] Step 11: The UE receives the DCI (such as the first DCI).

[0240] The DCI is used to trigger the transmission of the non-codebook SRS, and it also triggers the reference CSI-RS associated with that SRS. The UE uses the CSI-RS triggered by the DCI as a reference DL RS to determine the precoder for SRS transmission. This CSI-RS is the second downlink reference signal, i.e., the CSI-RS associated with a portion of the antenna port.

[0241] Furthermore, in this DCI, there is a field indicating that the UE calculates the SRS precoder based on the first downlink reference signal port (or DL ​​full port), for example: a 1-bit indication.

[0242] It should be noted that although the UE measures the CSI-RS of a portion of the ports, the UE can calculate the SRS precoder based on the DL channel of the entire port.

[0243] In some examples, if the field is not included in the DCI or the bit in the DCI indicates "0", the UE calculates the precoder based on the second downlink reference signal port (or the channel of part of the antenna).

[0244] In some examples, the DCI includes, but is not limited to, at least one of DCI 1-1, DCI1-2, DCI0-1, and DCI0-2.

[0245] In some examples, the second downlink reference signal is in the same slot as the DCI.

[0246] In some examples, the non-codebook SRS is an aperiodic SRS.

[0247] In some examples, the second downlink reference signal has a first downlink reference signal that is related to it.

[0248] For example, the first downlink reference signal associated with the second downlink reference signal is configured or pre-configured via RRC.

[0249] For example, in the corresponding field of the DCI, the information of the first downlink reference signal associated with the second downlink reference signal is further indicated.

[0250] For example, the first downlink reference signal is a periodic or semi-persistent transmission.

[0251] Step 12: The UE measures the channel of a portion of the antenna ports in real time based on the second downlink reference signal.

[0252] Step 13: The UE finds the first downlink reference signal, measures the previous full-port channel, and determines the correlation matrix.

[0253] Step 14: The UE calculates the full port channel based on the correlation matrix and the real-time partial port channel.

[0254] Step 15: The UE calculates the SRS precoder based on the full-port channel.

[0255] In some possible examples, taking the terminal device as a UE, the communication method may include the following steps:

[0256] After the UE calculates the SRS precoder based on the first or second downlink reference signal and transmits the SRS, the UE receives a non-codebook PUSCH SRI indication, which indicates that the corresponding SRI(s) should be transmitted via the Non-codebook PUSCH. The SRI indication is related to the number of SRS resources(s) actually transmitted.

[0257] Generally, the SRI indication is related to the number of SRS resource(s) contained in the SRS resource set configured in the network. For example, the bit width or number of bits of the SRI indication can be calculated using the following formula.

[0258] Where, N SRS L is the number of SRS resource(s) contained in the SRS resource set during non-codebook transmission. max This is the maximum number of PUSCH layers configured by the network or supported by the UE.

[0259] Furthermore, based on some parameters such as L max The UE determines the table corresponding to the SRI instruction, as shown in the example table below. According to N... SRSThe UE determines a column in the table as the SRI to be used; further, based on the SRI indication, it determines the SRI(s) corresponding to the PUSCH transmission and implicitly determines the number of transmission layers.

[0260] Table 1 (SRI indication for non-codebook based PUSCH transmission,L max =3)

[0261] In this embodiment, since the UE can calculate the SRS precoder based on the second downlink reference signal and transmit the SRS, the actual number of SRS resource(s) transmitted in the SRS resource set can be less than the number of SRS resource(s) in the network-configured SRS resource set. For example, if the number of ports of the second downlink reference signal is relatively small, and the rank of the channel calculated by the second downlink reference signal (i.e., the rank of the channel calculated by the second downlink reference signal <= the number of ports of the second downlink reference signal), then the actual number of SRS resource(s) transmitted in the SRS resource set can be <= the number of ports of the second downlink reference signal, and may be less than the number of SRS resource(s) in the network-configured SRS resource set.

[0262] In some examples, if the number of second downlink reference signal ports N is less than the number of SRS resources M contained in the SRS resource set, then the SRS resource(s) actually sent by the UE are the first N SRS resources(s) in the SRS resource set, or the UE cancels or discards the last MN SRS resources(s) in the SRS resource set.

[0263] In some examples, if the rank R calculated by the second downlink reference signal port is less than the number M of SRS resources contained in the SRS resource set, then the SRS resource(s) actually sent by the UE are the first R SRS resources(s) in the SRS resource set, or the UE cancels / discards the last MR SRS resources(s) in the SRS resource set.

[0264] In some embodiments of this application, when determining the bit width or number of bits indicated by the SRI, or the columns in the table associated with the SRI, the number of SRS resource(s) actually transmitted may be used instead of the number of SRS resource(s) in the SRS resource set configured by the network.

[0265] In some examples, if the UE calculates the SRS precoder based on the second downlink reference signal and transmits the SRS, and the number of second downlink reference signal ports is less than the number of SRS resource(s), then N SRS N represents the actual number of SRS resource(s) transmitted; if the UE calculates the SRS precoder based on the first downlink reference signal and transmits the SRS, then N SRS This indicates the number of SRS resources(s) within the SRS resource set.

[0266] In some examples, if the UE calculates the SRS precoder based on the second downlink reference signal and transmits the SRS, and the number of second downlink reference signal ports is less than the number of SRS resource(s), then N SRS This indicates the number of ports for the second downlink reference signal; if the UE calculates the SRS precoder based on the first downlink reference signal and transmits the SRS, then N SR This indicates the number of SRS resources(s) within the SRS resource set.

[0267] In some examples, if the UE calculates the SRS precoder based on the second downlink reference signal and transmits the SRS, and the number of second downlink reference signal ports is less than the number of SRS resource(s), then N SRS This represents the rank of the second downlink reference signal port channel; if the UE calculates the SRS precoder based on the first downlink reference signal and transmits the SRS, then N SRS This indicates the number of SRS resources(s) within the SRS resource set.

[0268] The solution proposed in this application, which is non-codebook-based uplink transmission, avoids mismatch between UE transmission and base station reception, thus ensuring uplink transmission performance.

[0269] Figure 5 is a flowchart illustrating the communication method provided in an embodiment of this application. As shown in Figure 5, the communication method may include the following steps 301 and 302:

[0270] Step 301: The network-side device sends the first downlink reference signal and the second downlink reference signal.

[0271] The second downlink reference signal is associated with the first downlink reference signal; the number of ports of the first downlink reference signal is greater than the number of ports of the second downlink reference signal, and the antenna ports associated with the first downlink reference signal include the antenna ports associated with the second downlink reference signal.

[0272] Step 302: The network-side device receives the non-codebook SRS, and the precoding information of the non-codebook SRS is determined based on the first downlink reference signal or the second downlink reference signal.

[0273] In some embodiments of this application, the terminal device receives a first downlink reference signal and a second downlink reference signal from a network-side device.

[0274] In some embodiments of this application, the terminal device sends a non-codebook SRS to the network-side device.

[0275] It should be noted that the explanations of steps 301 and 302 can be found in the relevant descriptions on the terminal device side, and will not be repeated here.

[0276] The communication method provided in this application embodiment involves a network-side device transmitting a first downlink reference signal and a second downlink reference signal. The first downlink reference signal is associated with another downlink reference signal, the number of ports in the first downlink reference signal is greater than the number of ports in the second downlink reference signal, and the antenna ports associated with the first downlink reference signal include the antenna ports associated with the second downlink reference signal. The network-side device receives a non-codebook SRS, and the precoding information of the non-codebook SRS is determined based on either the first or second downlink reference signal. Through this method, the first downlink reference signal and the second downlink reference signal transmitted by the network-side device are associated, allowing the terminal device to determine the precoding information of the non-codebook SRS based on either the first or second downlink reference signal. This avoids mismatch between terminal device transmission and network-side device reception in non-codebook-based uplink transmission scenarios, ensuring transmission performance.

[0277] In some embodiments of this application, the communication method described above may include the following step 303:

[0278] Step 303: The network-side device sends the first downlink control information (DCI).

[0279] Wherein, the first DCI is used to trigger the non-codebook SRS and the second downlink reference signal; or, the first DCI is used to trigger the non-codebook SRS and trigger the second downlink reference signal and the first downlink reference signal.

[0280] In some embodiments of this application, the aforementioned non-codebook SRS is aperiodic and associated with aperiodic second downlink reference signal.

[0281] In some embodiments of this application, the first downlink reference signal associated with the aforementioned aperiodic second downlink reference signal is periodic or semi-persistent.

[0282] In some embodiments of this application, the first downlink reference signal is the most recent CSI-RS preceding the second downlink reference signal.

[0283] In some embodiments of this application, the aforementioned second downlink reference signal is used to determine the channel information of a portion of the port.

[0284] In some embodiments of this application, the terminal device receives the first DCI from the network-side device.

[0285] In some possible examples, step 303 above can be performed before step 301.

[0286] It should be noted that the explanation of step 303 can be found in the relevant description on the terminal device side, and will not be repeated here.

[0287] In some embodiments of this application, the communication method may include the following step 304:

[0288] Step 304: The network-side device sends the first instruction information.

[0289] The aforementioned first instruction information indicates any of the following:

[0290] The aforementioned first downlink reference signal serves as the associated downlink reference signal for the aforementioned non-codebook SRS;

[0291] The aforementioned second downlink reference signal serves as the associated downlink reference signal for the aforementioned non-codebook SRS;

[0292] Both the first downlink reference signal and the second downlink reference signal mentioned above can be used as associated downlink reference signals for the non-codebook SRS.

[0293] Optionally, when the second downlink reference signal serves as the associated downlink reference signal for the aforementioned non-codebook SRS, the second downlink reference is associated with the first reference signal (or, associated with at least one first reference signal); or, when the first downlink reference signal serves as the associated downlink reference signal for the aforementioned non-codebook SRS, the first downlink reference is associated with the second downlink reference signal (or, associated with at least one second reference signal). Optionally, the association relationship or the downlink reference signal with the association relationship can be determined by at least one of the first indication information, the third indication information, and the protocol agreement, wherein the third indication information is indication information different from the first indication information.

[0294] In some embodiments of this application, the terminal device receives first indication information from the network-side device.

[0295] It should be noted that the explanation of step 304 can be found in the relevant description on the terminal device side, and will not be repeated here.

[0296] In some embodiments of this application, the communication method may include the following step 305:

[0297] Step 305: The network-side device sends the second instruction information.

[0298] The second indication information indicates the information of the channel associated with the antenna port of the first downlink reference signal to determine the precoding information of the non-codebook SRS. The second downlink reference signal is the associated downlink reference signal of the non-codebook SRS.

[0299] In some embodiments of this application, the aforementioned second indication information is carried via Radio Resource Control (RRC) signaling, Media Access Layer Control (MAC) CE, or Downlink Control Information (DCI).

[0300] The first downlink reference signal and the second downlink reference signal mentioned above are related.

[0301] In some embodiments of this application, the terminal device receives second indication information from the network-side device.

[0302] It should be noted that the explanation of step 305 can be found in the relevant description on the terminal device side, and will not be repeated here.

[0303] It should be noted that the explanation of network-side devices can be found in the relevant explanations of terminal devices mentioned above, and will not be repeated here.

[0304] Figure 6 is a schematic diagram of the interaction method provided in an embodiment of this application. As shown in Figure 6, the method may include the following steps:

[0305] Step 401: The network-side device sends the first downlink reference signal and the second downlink reference signal.

[0306] Step 402: The terminal device receives the first downlink reference signal and the second downlink reference signal.

[0307] Step 403: The terminal device sends a non-codebook detection reference signal (SRS), the precoding information of which is determined based on the first downlink reference signal or the second downlink reference signal.

[0308] Step 404: The network-side device receives the non-codebook probe reference signal (SRS).

[0309] The number of ports of the first downlink reference signal is greater than the number of ports of the second downlink reference signal, and the antenna ports associated with the first downlink reference signal include the antenna ports associated with the second downlink reference signal.

[0310] In some embodiments of this application, referring to FIG6 above, as shown in FIG7, the steps B1 and B2 may be included before step 401 above:

[0311] Step B1: The network-side device sends the first indication information.

[0312] Step B2: The terminal device determines, based on the first instruction information, that the first downlink reference signal or the second downlink reference signal is the target downlink reference signal associated with the non-codebook SRS.

[0313] In some embodiments of this application, after step B1 above, the following steps C1 and C2 may also be included:

[0314] Step C1: The network-side device sends a second indication information, which indicates the information of the channel associated with the antenna port based on the first downlink reference signal, and determines the precoding information of the non-codebook SRS. The second downlink reference signal is the associated downlink reference signal of the non-codebook SRS.

[0315] The aforementioned second indication information is carried via Radio Resource Control (RRC) signaling, Media Access Layer Control (MAC) CE, or Downlink Control Information (DCI).

[0316] Step C2: When the second downlink reference signal is used as the associated downlink reference signal of the non-codebook SRS, the terminal device determines the information of the channel associated with the antenna port based on the first downlink reference signal according to the second indication information, and determines the precoding information of the non-codebook SRS.

[0317] It should be noted that the explanation of this embodiment can be found in the relevant descriptions of the terminal device and network side device method embodiments described above, and will not be repeated here.

[0318] The communication method provided in this application can be executed by a communication device. This application uses the example of a communication device executing the communication method to illustrate the communication device provided in this application.

[0319] This application provides a communication device. As an example, the communication device may be a communication equipment or a component within a communication equipment, such as a chip. The communication equipment may be a terminal, a network-side device, or a server, etc. Exemplarily, the terminal may include, but is not limited to, the type of terminal 11a listed above, and the network-side device may include, but is not limited to, the type of network-side device 12a listed above. This application does not impose specific limitations.

[0320] The communication device includes a receiving module, a transmitting module, and a processing module. These modules can be implemented in software or hardware. When implemented in hardware, the processing module can be implemented by a processor. For example, the processor can include general-purpose processors, special-purpose processors, such as a Central Processing Unit (CPU), microprocessor, Digital Signal Processor (DSP), Artificial Intelligence (AI) processor, Graphics Processing Unit (GPU), Application Specific Integrated Circuit (ASIC), Network Processor (NP), Field Programmable Gate Array (FPGA), or other programmable logic devices, gate circuits, transistors, discrete hardware components, etc. The receiving and transmitting modules can be implemented by a communication interface, which can include one or more of the following: transceiver, pins, circuits, bus, radio frequency unit, etc.

[0321] Specifically, referring to Figure 8, when the communication device is a terminal or a component in a terminal, the communication device 500 includes a transmitting module 501, which is used to transmit a non-codebook detection reference signal (SRS). The precoding information of the non-codebook SRS is determined based on a first downlink reference signal or a second downlink reference signal. The number of ports of the first downlink reference signal is greater than the number of ports of the second downlink reference signal, and the antenna ports associated with the first downlink reference signal include the antenna ports associated with the second downlink reference signal.

[0322] In some embodiments of this application, the first downlink reference signal and the second downlink reference signal are received at different times, and the first downlink reference signal, the second downlink reference signal and the non-codebook SRS are received on the same carrier.

[0323] In some embodiments of this application, the port of the first downlink reference signal is associated with all antenna ports of the network-side device, and the port of the second downlink reference signal is associated with some antenna ports of the network-side device; or, the number of antenna ports of the network-side device associated with the port of the first downlink reference signal is greater than the number of antenna ports of the network-side device associated with the port of the second downlink reference signal.

[0324] In some embodiments of this application, the above-described apparatus further includes: a processing module; the processing module is further configured to determine the precoding information of the non-codebook SRS based on the first downlink reference signal or the second downlink reference signal before transmitting the non-codebook probe reference signal (SRS); the processing module is specifically configured to perform any one of the following: determining the precoding information of the non-codebook SRS according to first channel information, wherein the first channel information is the information of the channel associated with the antenna port of the first downlink reference signal; determining the precoding information of the non-codebook SRS according to second channel information, wherein the second channel information is the information of the channel associated with the antenna port of the second downlink reference signal.

[0325] In some embodiments of this application, the aforementioned first channel information is determined based on at least one of the following:

[0326] Measurement information of the first downlink reference signal;

[0327] Measurement information of the second downlink reference signal;

[0328] Antenna port correlation information is determined based on the measurement information of the first downlink reference signal.

[0329] In some embodiments of this application, the above-mentioned apparatus further includes: a processing module; the processing module is configured to determine, according to the first indication information, a first downlink reference signal or a second downlink reference signal as a target downlink reference signal associated with a non-codebook SRS, wherein the precoding information of the non-codebook SRS is determined based on the target downlink reference signal;

[0330] The first instruction information indicates any of the following:

[0331] The first downlink reference signal serves as the associated downlink reference signal for the non-codebook SRS;

[0332] The second downlink reference signal serves as the associated downlink reference signal for the non-codebook SRS;

[0333] Both the first downlink reference signal and the second downlink reference signal can be used as associated downlink reference signals for non-codebook SRS.

[0334] In some embodiments of this application, when the first indication information indicates that the second downlink reference signal is used as the associated downlink reference signal of the non-codebook SRS, the second downlink reference signal is associated with the first downlink reference signal.

[0335] Alternatively, when the first indication information indicates that the first downlink reference signal is used as the associated downlink reference signal of the non-codebook SRS, the first downlink reference signal is associated with the second downlink reference signal.

[0336] In some embodiments of this application, the aforementioned second downlink reference signal is used to determine the channel information of a portion of the port.

[0337] In some embodiments of this application, the processing module is configured to, when the second downlink reference signal is used as the associated downlink reference signal of the non-codebook SRS, determine the information of the channel associated with the antenna port associated with the first downlink reference signal according to the protocol agreement or the second indication information, and determine the precoding information of the non-codebook SRS; wherein, the second indication information is carried through Radio Resource Control (RRC) signaling, or Media Access Layer Control (MAC) CE, or Downlink Control Information (DCI); wherein, the first downlink reference signal is associated with the second downlink reference signal.

[0338] In some embodiments of this application, the above-described processing module is further configured to: calculate the precoding information of the non-codebook SRS based on the channel information associated with the antenna port of the first downlink reference signal when the second indication information indicates that the precoding information of the non-codebook SRS is calculated based on the channel information associated with the antenna port of the first downlink reference signal; or, calculate the precoding information of the non-codebook SRS based on the second downlink reference signal when the second indication information does not indicate that the precoding information of the non-codebook SRS is calculated based on the first downlink reference signal or when the second indication information does not exist.

[0339] In some embodiments of this application, the aforementioned non-codebook SRS is aperiodic and associated with aperiodic second downlink reference signal; wherein, the aperiodic non-codebook SRS is triggered by the first DCI, and the first DCI simultaneously triggers the aperiodic second downlink reference signal; wherein, the aperiodic second downlink reference signal is associated with the first downlink reference signal.

[0340] In some embodiments of this application, the first downlink reference signal associated with the aforementioned aperiodic second downlink reference signal is periodic or semi-continuous.

[0341] In some embodiments of this application, the aforementioned non-codebook SRS is aperiodic and associated with an aperiodic second downlink reference signal and an aperiodic first downlink reference signal; wherein, the aforementioned aperiodic SRS is triggered by a first DCI, and the first DCI simultaneously triggers the aperiodic second downlink reference signal and the aperiodic first downlink reference signal.

[0342] In some embodiments of this application, the above-described processing module is further configured to determine the precoding information of the non-codebook SRS based on the first downlink reference signal or the second downlink reference signal before transmitting the non-codebook probe reference signal (SRS); the above-described processing module is specifically configured to: determine the precoding information of the non-codebook SRS based on the first downlink reference signal or the second downlink reference signal according to the first timing information; wherein, the first timing information includes the timing relationship between the first downlink reference signal, the second downlink reference signal and at least two of the non-codebook SRS.

[0343] In some embodiments of this application, the first timing information described above further includes at least one of the following:

[0344] The time interval between the first downlink reference signal and the non-codebook SRS;

[0345] The time interval between the second downlink reference signal and the non-codebook SRS;

[0346] The time interval between the first downlink reference signal and the second downlink reference signal.

[0347] In some embodiments of this application, the above-described processing module is specifically used to: determine the precoding information of the non-codebook SRS based on the first downlink reference signal when the first condition is met; or, determine the precoding information of the non-codebook SRS based on the second downlink reference signal when the second condition is met.

[0348] In some embodiments of this application, the first condition includes any one of the following: the time interval between the first downlink reference signal and the non-codebook SRS is greater than or equal to a first threshold, and / or the time interval between the first downlink reference signal and the non-codebook SRS is less than or equal to a second threshold; the time interval between the first downlink reference signal and the non-codebook SRS is less than the first threshold or greater than the second threshold, and the second downlink reference signal satisfies the third condition.

[0349] In some embodiments of this application, the third condition includes at least one of the following: the time interval between the second downlink reference signal and the non-codebook SRS is greater than or equal to a first threshold, and / or the time interval between the second downlink reference signal and the non-codebook SRS is less than or equal to a second threshold; the second downlink reference signal is associated with the first downlink reference signal; the first downlink reference signal is transmitted before the second downlink reference signal, and the time interval between the first downlink reference signal and the second downlink reference signal is greater than or equal to a third threshold, and / or the time interval between the first downlink reference signal and the second downlink reference signal is less than or equal to a fourth threshold.

[0350] In some embodiments of this application, the second condition includes at least one of the following: the time interval between the first downlink reference signal and the non-codebook SRS is less than a first threshold, and / or the time interval between the first downlink reference signal and the non-codebook SRS is greater than a second threshold; the time interval between the first downlink reference signal and the non-codebook SRS is less than the first threshold or greater than the second threshold, and the second downlink reference signal does not satisfy any condition in the third condition group; the time interval between the second downlink reference signal and the non-codebook SRS is greater than or equal to a fifth threshold, and / or less than or equal to a sixth threshold.

[0351] In some embodiments of this application, the above-mentioned processing module is specifically used to: when neither the first condition nor the second condition is met, determine the precoding information determined by the third downlink reference signal as the precoding information of the non-codebook SRS, or not expect to update the precoding information of the non-codebook SRS; wherein, the third downlink reference signal is a downlink reference signal other than the first downlink reference signal and the second downlink reference signal.

[0352] In some embodiments of this application, the above-described sending module is further configured to: report second information; wherein the second information is used to indicate port information of the downlink reference signal used to determine the precoding information of the non-codebook SRS.

[0353] The communication device provided in this application transmits a non-codebook SRS. The precoding information of the non-codebook SRS is determined based on a first downlink reference signal or a second downlink reference signal. The number of ports in the first downlink reference signal is greater than the number of ports in the second downlink reference signal, and the antenna ports associated with the first downlink reference signal include the antenna ports associated with the second downlink reference signal. This method enables the determination of the SRS precoding information based on the first downlink reference signal or the second downlink reference signal, thereby avoiding mismatch between terminal device transmission and network-side device reception in non-codebook-based uplink transmission scenarios and ensuring transmission performance.

[0354] Referring to Figure 9, when the communication device is a network-side device or a component within a network-side device, the communication device 600 includes a transmitting module 601 and a receiving module 602. The transmitting module 601 is used to transmit a first downlink reference signal and a second downlink reference signal, wherein the second downlink reference signal is associated with the first downlink reference signal; the number of ports of the first downlink reference signal is greater than the number of ports of the second downlink reference signal, and the antenna ports associated with the first downlink reference signal include the antenna ports associated with the second downlink reference signal; the receiving module 602 is used to receive a non-codebook detection reference signal (SRS); wherein the precoding information of the non-codebook SRS is determined based on the first downlink reference signal or the second downlink reference signal.

[0355] In some embodiments of this application, the above-mentioned transmitting module is further configured to transmit a first downlink control information (DCI); wherein the first DCI is used to trigger a non-codebook SRS and a second downlink reference signal; or, the first DCI is used to trigger a non-codebook SRS and trigger the second downlink reference signal and the first downlink reference signal.

[0356] In some embodiments of this application, the aforementioned non-codebook SRS is aperiodic and associated with aperiodic second downlink reference signal.

[0357] In some embodiments of this application, the first downlink reference signal associated with the aforementioned aperiodic second downlink reference signal is periodic or semi-continuous.

[0358] In some embodiments of this application, the aforementioned second downlink reference signal is used to determine the channel information of a portion of the port.

[0359] In some embodiments of this application, the above-described sending module is further configured to send first indication information;

[0360] The first instruction information indicates any of the following:

[0361] The first downlink reference signal serves as the associated downlink reference signal for the non-codebook SRS;

[0362] The second downlink reference signal serves as the associated downlink reference signal for the non-codebook SRS;

[0363] Both the first downlink reference signal and the second downlink reference signal can be used as associated downlink reference signals for non-codebook SRS.

[0364] In some embodiments of this application, when the first indication information indicates that the second downlink reference signal is used as the associated downlink reference signal of the non-codebook SRS, the second downlink reference signal is associated with the first downlink reference signal.

[0365] Alternatively, when the first indication information indicates that the first downlink reference signal is used as the associated downlink reference signal of the non-codebook SRS, the first downlink reference signal is associated with the second downlink reference signal.

[0366] In some embodiments of this application, the above-mentioned transmitting module is further configured to transmit second indication information, the second indication information indicating information of the channel associated with the antenna port of the first downlink reference signal, determining the precoding information of the non-codebook SRS, and the second downlink reference signal being the associated downlink reference signal of the non-codebook SRS;

[0367] The second indication information is carried through Radio Resource Control (RRC) signaling, Media Access Layer Control (MAC) CE, or Downlink Control Information (DCI).

[0368] In some embodiments of this application, the first downlink reference signal and the second downlink reference signal are transmitted at different times, and the first downlink reference signal, the second downlink reference signal and the non-codebook SRS are transmitted on the same carrier.

[0369] The communication device provided in this application transmits a first downlink reference signal and a second downlink reference signal. The number of ports in the first downlink reference signal is greater than the number of ports in the second downlink reference signal, and the antenna ports associated with the first downlink reference signal include the antenna ports associated with the second downlink reference signal. The communication device receives a non-codebook SRS, and the precoding information of the non-codebook SRS is determined based on the aforementioned first downlink reference signal or second downlink reference signal. This method enables the determination of the precoding information of the non-codebook SRS based on either the first downlink reference signal or the second downlink reference signal, thereby avoiding mismatch between terminal device transmission and network-side device reception in non-codebook-based uplink transmission scenarios and ensuring transmission performance.

[0370] The communication device provided in this application embodiment can implement the various processes implemented in the above communication method embodiment and achieve the same technical effect. To avoid repetition, it will not be described again here.

[0371] As shown in Figure 10, this application embodiment also provides a communication device 700, including a processor 701 and a memory 702. The memory 702 stores programs or instructions that can run on the processor 701. For example, when the communication device 700 is a terminal, the program or instructions executed by the processor 701 implement the various steps of the above-described communication method embodiment and achieve the same technical effect. When the communication device 700 is a network-side device, the program or instructions executed by the processor 701 implement the various steps of the above-described communication method embodiment and achieve the same technical effect. To avoid repetition, further details are omitted here.

[0372] This application also provides a terminal (i.e., a terminal device) including a processor and a communication interface. The communication interface is coupled to the processor, and the processor is used to run programs or instructions to implement the steps in the method embodiment shown in the figure. This terminal embodiment corresponds to the above-described terminal-side method embodiment. All implementation processes and methods of the above-described method embodiments can be applied to this terminal embodiment and achieve the same technical effect. The terminal can be the communication device shown in Figure 8. Specifically, Figure 11 is a schematic diagram of the hardware structure of a terminal implementing an embodiment of this application.

[0373] The terminal 100 includes, but is not limited to, at least some of the following components: radio frequency unit 101, network module 102, audio output unit 103, input unit 104, sensor 105, display unit 106, user input unit 107, interface unit 108, memory 109, and processor 110.

[0374] Those skilled in the art will understand that terminal 100 may also include a power supply (such as a battery) for powering various components. The power supply can be logically connected to processor 110 through a power management system, thereby enabling functions such as charging, discharging, and power consumption management through the power management system. The terminal structure shown in Figure 11 does not constitute a limitation on the terminal. The terminal may include more or fewer components than shown, or combine certain components, or have different component arrangements, which will not be elaborated here.

[0375] It should be understood that, in this embodiment, the input unit 104 may include a graphics processor 1041 and a microphone 1042. The graphics processor 1041 processes image data of still images or videos obtained by an image capture device (such as a camera) in video capture mode or image capture mode. The display unit 106 may include a display panel 1061, which may be configured in the form of a liquid crystal display, an organic light-emitting diode, or the like. The user input unit 107 includes at least one of a touch panel 1071 and other input devices 1072. The touch panel 1071 is also called a touch screen. The touch panel 1071 may include a touch detection device and a touch controller. Other input devices 1072 may include, but are not limited to, physical keyboards, function keys (such as volume control buttons, power buttons, etc.), trackballs, mice, and joysticks, which will not be described in detail here.

[0376] In this embodiment, after receiving downlink data from the network-side device, the radio frequency unit 101 can transmit it to the processor 110 for processing; in addition, the radio frequency unit 101 can send uplink data to the network-side device. Typically, the radio frequency unit 101 includes, but is not limited to, antennas, amplifiers, transceivers, couplers, low-noise amplifiers, duplexers, etc.

[0377] The memory 109 can be used to store software programs or instructions, as well as various data. The memory 109 may primarily include a first storage area for storing programs or instructions and a second storage area for storing data. The first storage area may store the operating system, application programs or instructions required for at least one function (such as sound playback, image playback, etc.). Furthermore, the memory 109 may include volatile memory or non-volatile memory. The non-volatile memory may be read-only memory (ROM), programmable read-only memory (PROM), erasable programmable read-only memory (EPROM), electrically erasable programmable read-only memory (EEPROM), or flash memory. Volatile memory can be random access memory (RAM), static random access memory (SRAM), dynamic random access memory (DRAM), synchronous dynamic random access memory (SDRAM), double data rate synchronous dynamic random access memory (DDRSDRAM), enhanced synchronous dynamic random access memory (ESDRAM), synchronous linked dynamic random access memory (SLDRAM), and direct memory bus RAM (DRRAM). The memory 109 in the embodiments of this application includes, but is not limited to, these and any other suitable types of memory.

[0378] Processor 110 may include one or more processing units; optionally, processor 110 integrates an application processor and a modem processor, wherein the application processor mainly handles operations involving the operating system, user interface, and applications, and the modem processor mainly handles wireless communication signals, such as a baseband processor. It is understood that the aforementioned modem processor may also not be integrated into processor 110.

[0379] The radio frequency unit 101 is used to transmit a non-codebook detection reference signal (SRS), the precoding information of which is determined based on a first downlink reference signal or a second downlink reference signal; wherein the number of ports of the first downlink reference signal is greater than the number of ports of the second downlink reference signal, and the antenna ports associated with the first downlink reference signal include the antenna ports associated with the second downlink reference signal.

[0380] In some embodiments of this application, the first downlink reference signal and the second downlink reference signal are transmitted at different times, and the first downlink reference signal, the second downlink reference signal and the non-codebook SRS are received on the same carrier.

[0381] In some embodiments of this application, the port of the first downlink reference signal is associated with all antenna ports of the network-side device, and the port of the second downlink reference signal is associated with some antenna ports of the network-side device; or, the number of antenna ports of the network-side device associated with the port of the first downlink reference signal is greater than the number of antenna ports of the network-side device associated with the port of the second downlink reference signal.

[0382] In some embodiments of this application, the processor 110 is further configured to determine the precoding information of the non-codebook SRS based on the first downlink reference signal or the second downlink reference signal before transmitting the non-codebook probe reference signal (SRS); the processor 110 is specifically configured to perform any of the following: determining the precoding information of the non-codebook SRS based on first channel information, wherein the first channel information is the information of the channel associated with the antenna port of the first downlink reference signal; determining the precoding information of the non-codebook SRS based on second channel information, wherein the second channel information is the information of the channel associated with the antenna port of the second downlink reference signal.

[0383] In some embodiments of this application, the aforementioned first channel information is determined based on at least one of the following:

[0384] Measurement information of the first downlink reference signal;

[0385] Measurement information of the second downlink reference signal;

[0386] Antenna port correlation information is determined based on the measurement information of the first downlink reference signal.

[0387] In some embodiments of this application, the above-described apparatus further includes: a processor 110; the processor 110 is configured to determine, based on first indication information, a first downlink reference signal or a second downlink reference signal as a target downlink reference signal associated with a non-codebook SRS, wherein the precoding information of the non-codebook SRS is determined based on the target downlink reference signal;

[0388] The first instruction information indicates any of the following:

[0389] The first downlink reference signal serves as the associated downlink reference signal for the non-codebook SRS;

[0390] The second downlink reference signal serves as the associated downlink reference signal for the non-codebook SRS;

[0391] Both the first downlink reference signal and the second downlink reference signal can be used as associated downlink reference signals for non-codebook SRS.

[0392] In some embodiments of this application, when the first indication information indicates that the second downlink reference signal is used as the associated downlink reference signal of the non-codebook SRS, the second downlink reference signal is associated with the first downlink reference signal.

[0393] Alternatively, when the first indication information indicates that the first downlink reference signal is used as the associated downlink reference signal of the non-codebook SRS, the first downlink reference signal is associated with the second downlink reference signal.

[0394] In some embodiments of this application, the aforementioned second downlink reference signal is used to determine the channel information of a portion of the port.

[0395] In some embodiments of this application, the processor 110 is configured to: when the second downlink reference signal is used as the associated downlink reference signal of the non-codebook SRS, determine the information of the channel associated with the antenna port associated with the first downlink reference signal according to the protocol agreement or the second indication information, and determine the precoding information of the non-codebook SRS; wherein the second indication information is carried by Radio Resource Control (RRC) signaling, or Media Access Layer Control (MAC) CE, or Downlink Control Information (DCI); wherein the first downlink reference signal is associated with the second downlink reference signal.

[0396] In some embodiments of this application, the processor 110 is further configured to: calculate the precoding information of the non-codebook SRS based on the channel information associated with the antenna port of the first downlink reference signal when the second indication information indicates that the precoding information of the non-codebook SRS is calculated based on the channel information associated with the antenna port of the first downlink reference signal; or, calculate the precoding information of the non-codebook SRS based on the second downlink reference signal when the second indication information does not indicate that the precoding information of the non-codebook SRS is calculated based on the first downlink reference signal or when the second indication information does not exist.

[0397] In some embodiments of this application, the aforementioned non-codebook SRS is aperiodic and associated with aperiodic second downlink reference signal; wherein, the aperiodic non-codebook SRS is triggered by the first DCI, and the first DCI simultaneously triggers the aperiodic second downlink reference signal; wherein, the aperiodic second downlink reference signal is associated with the first downlink reference signal.

[0398] In some embodiments of this application, the first downlink reference signal associated with the aforementioned aperiodic second downlink reference signal is periodic or semi-continuous.

[0399] In some embodiments of this application, the aforementioned non-codebook SRS is aperiodic and associated with an aperiodic second downlink reference signal and an aperiodic first downlink reference signal; wherein, the aforementioned aperiodic SRS is triggered by a first DCI, and the first DCI simultaneously triggers the aperiodic second downlink reference signal and the aperiodic first downlink reference signal.

[0400] In some embodiments of this application, the processor 110 is further configured to determine precoding information of the non-codebook SRS based on a first downlink reference signal or a second downlink reference signal before transmitting the non-codebook probe reference signal (SRS); specifically, the processor 110 is configured to: determine the precoding information of the non-codebook SRS based on the first downlink reference signal or the second downlink reference signal according to first timing information; wherein, the first timing information includes the timing relationship between at least two of the first downlink reference signal, the second downlink reference signal, and the non-codebook SRS.

[0401] In some embodiments of this application, the first timing information described above further includes at least one of the following:

[0402] The time interval between the first downlink reference signal and the non-codebook SRS;

[0403] The time interval between the second downlink reference signal and the non-codebook SRS;

[0404] The time interval between the first downlink reference signal and the second downlink reference signal.

[0405] In some embodiments of this application, the processor 110 is specifically configured to: determine the precoding information of the non-codebook SRS based on the first downlink reference signal when a first condition is met; or, determine the precoding information of the non-codebook SRS based on the second downlink reference signal when a second condition is met.

[0406] In some embodiments of this application, the first condition includes any one of the following: the time interval between the first downlink reference signal and the non-codebook SRS is greater than or equal to a first threshold, and / or the time interval between the first downlink reference signal and the non-codebook SRS is less than or equal to a second threshold; the time interval between the first downlink reference signal and the non-codebook SRS is less than the first threshold or greater than the second threshold, and the second downlink reference signal satisfies the third condition.

[0407] In some embodiments of this application, the third condition includes at least one of the following: the time interval between the second downlink reference signal and the non-codebook SRS is greater than or equal to a first threshold, and / or the time interval between the second downlink reference signal and the non-codebook SRS is less than or equal to a second threshold; the second downlink reference signal is associated with the first downlink reference signal; the first downlink reference signal is transmitted before the second downlink reference signal, and the time interval between the first downlink reference signal and the second downlink reference signal is greater than or equal to a third threshold, and / or the time interval between the first downlink reference signal and the second downlink reference signal is less than or equal to a fourth threshold.

[0408] In some embodiments of this application, the second condition includes at least one of the following: the time interval between the first downlink reference signal and the non-codebook SRS is less than a first threshold, and / or the time interval between the first downlink reference signal and the non-codebook SRS is greater than a second threshold; the time interval between the first downlink reference signal and the non-codebook SRS is less than the first threshold or greater than the second threshold, and the second downlink reference signal does not satisfy any condition in the third condition group; the time interval between the second downlink reference signal and the non-codebook SRS is greater than or equal to a fifth threshold, and / or less than or equal to a sixth threshold.

[0409] In some embodiments of this application, the processor 110 is specifically configured to: determine the precoding information determined by the third downlink reference signal as the precoding information of the non-codebook SRS when neither the first condition nor the second condition is met, or not to update the precoding information of the non-codebook SRS; wherein the third downlink reference signal is a downlink reference signal other than the first downlink reference signal and the second downlink reference signal.

[0410] In some embodiments of this application, the radio frequency unit 101 described above is further configured to: report second information; wherein the second information is used to indicate port information of the downlink reference signal used to determine the precoding information of the non-codebook SRS.

[0411] The terminal device provided in this application transmits a non-codebook SRS. The precoding information of the non-codebook SRS is determined based on a first downlink reference signal or a second downlink reference signal. The number of ports in the first downlink reference signal is greater than the number of ports in the second downlink reference signal, and the antenna ports associated with the first downlink reference signal include the antenna ports associated with the second downlink reference signal. This method enables the determination of the SRS precoding information based on the first downlink reference signal or the second downlink reference signal, thereby avoiding mismatch between terminal device transmission and network-side device reception in non-codebook-based uplink transmission scenarios and ensuring transmission performance.

[0412] It is understood that the implementation process of each implementation method mentioned in this embodiment can refer to the relevant description of communication in the method embodiment and achieve the same or corresponding technical effects. To avoid repetition, it will not be described again here.

[0413] This application also provides a network-side device, including a processor and a communication interface. The communication interface is coupled to the processor, and the processor is used to run programs or instructions to implement the steps of the method embodiment shown in the figure. This network-side device embodiment corresponds to the above-described network-side device method embodiment. All implementation processes and methods of the above-described method embodiments can be applied to this network-side device embodiment and achieve the same technical effects.

[0414] Specifically, this application embodiment also provides a network-side device, which can be the communication device shown in FIG9. As shown in FIG12, the network-side device 2000 includes: an antenna 2001, a radio frequency device 2002, a baseband device 2003, a processor 2004, and a memory 2005. The antenna 2001 is connected to the radio frequency device 2002. In the uplink direction, the radio frequency device 2002 receives information through the antenna 2001 and sends the received information to the baseband device 2003 for processing. In the downlink direction, the baseband device 2003 processes the information to be transmitted and sends it to the radio frequency device 2002, which processes the received information and then transmits it through the antenna 2001.

[0415] The method executed by the network-side device in the above embodiments can be implemented in the baseband device 2003, which includes a baseband processor.

[0416] The baseband device 2003 may include at least one baseband board, on which multiple chips are disposed, as shown in FIG12. One of the chips is, for example, a baseband processor, which is connected to the memory 2005 via a bus interface to call the program in the memory 2005 and execute the network device operation shown in the above method embodiment.

[0417] The network-side device may also include a network interface 2006, such as a Common Public Radio Interface (CPRI).

[0418] Specifically, the network-side device 2000 in this application embodiment further includes: instructions or programs stored in memory 2005 and executable on processor 2004. The processor 2004 calls the instructions or programs in memory 2005 to execute the methods executed by each module shown in the diagram communication and achieve the same technical effect. To avoid repetition, it will not be described in detail here.

[0419] This application also provides a readable storage medium storing a program or instructions. When the program or instructions are executed by a processor, they implement the various processes of the above-described communication method embodiments and achieve the same technical effects. To avoid repetition, they will not be described again here.

[0420] The processor mentioned above is the processor in the terminal described in the above embodiments. The readable storage medium includes computer-readable storage media, such as computer read-only memory (ROM), random access memory (RAM), magnetic disk, or optical disk. In some examples, the readable storage medium may be a non-transient readable storage medium.

[0421] This application embodiment also provides a chip, which includes a processor and a communication interface. The communication interface is coupled to the processor. The processor is used to run programs or instructions to implement the various processes of the above-described communication method embodiments and can achieve the same technical effect. To avoid repetition, it will not be described again here.

[0422] It should be understood that the chip mentioned in the embodiments of this application may also be referred to as a system-on-a-chip, system chip, chip system, or system-on-a-chip, etc.

[0423] This application also provides a computer program / program product, which is stored in a storage medium and executed by at least one processor to implement the various processes of the above-described communication method embodiments, and can achieve the same technical effect. To avoid repetition, it will not be described again here.

[0424] This application also provides a communication system, including: a terminal device and a network-side device, wherein the terminal device can be used to perform the steps of the terminal device-side method as described above, and the network-side device can be used to perform the steps of the network-side device method as described above.

[0425] It should be noted that, in this document, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitations, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes that element. Furthermore, it should be noted that the scope of the methods and apparatuses in the embodiments of this application is not limited to performing functions in the order shown or discussed, but may also include performing functions substantially simultaneously or in the reverse order, depending on the functions involved. For example, the described methods may be performed in a different order than described, and various steps may be added, omitted, or combined. Additionally, features described with reference to certain examples may be combined in other examples.

[0426] From the above description of the embodiments, those skilled in the art can clearly understand that the methods of the above embodiments can be implemented by means of computer software products plus necessary general-purpose hardware platforms, and of course, they can also be implemented by hardware. The computer software product is stored in a storage medium (such as ROM, RAM, magnetic disk, optical disk, etc.) and includes several instructions to cause the terminal or network-side device to execute the methods described in the various embodiments of this application.

[0427] The embodiments of this application have been described above with reference to the accompanying drawings. However, this application is not limited to the specific embodiments described above. The specific embodiments described above are merely illustrative and not restrictive. Those skilled in the art can make many other implementations under the guidance of this application without departing from the spirit and scope of the claims. All of these implementations are within the protection scope of this application.

Claims

1. A communication method, the method comprising: The terminal device sends a non-codebook detection reference signal (SRS), the precoding information of which is determined based on a first downlink reference signal or a second downlink reference signal. Wherein, the number of ports of the first downlink reference signal is greater than the number of ports of the second downlink reference signal, and the antenna ports associated with the first downlink reference signal include the antenna ports associated with the second downlink reference signal.

2. The method according to claim 1, wherein, The first downlink reference signal and the second downlink reference signal are received at different times, and the first downlink reference signal, the second downlink reference signal and the non-codebook SRS are received on the same carrier.

3. The method according to claim 1 or 2, wherein, The port of the first downlink reference signal is associated with all antenna ports of the network-side device, and the port of the second downlink reference signal is associated with some antenna ports of the network-side device; Alternatively, the number of antenna ports of the network-side device associated with the port of the first downlink reference signal is greater than the number of antenna ports of the network-side device associated with the port of the second downlink reference signal.

4. The method according to any one of claims 1 to 3, wherein, Before the terminal device sends the non-codebook probe reference signal (SRS), the method further includes: The terminal device determines the precoding information of the non-codebook SRS based on the first downlink reference signal or the second downlink reference signal; The terminal device determines the precoding information of the non-codebook SRS based on the first downlink reference signal or the second downlink reference signal, including any one of the following: The terminal device determines the precoding information of the non-codebook SRS based on the first channel information, wherein the first channel information is the information of the channel associated with the antenna port of the first downlink reference signal; The terminal device determines the precoding information of the non-codebook SRS based on the second channel information, where the second channel information is the information of the channel associated with the antenna port of the second downlink reference signal.

5. The method according to claim 4, wherein, The first channel information is determined based on at least one of the following: Measurement information of the first downlink reference signal; Measurement information of the second downlink reference signal; Antenna port correlation information, which is determined based on the measurement information of the first downlink reference signal.

6. The method according to any one of claims 1 to 5, wherein, The method further includes: The terminal device determines, according to the first indication information, that the first downlink reference signal or the second downlink reference signal is a target downlink reference signal associated with the non-codebook SRS, and the precoding information of the non-codebook SRS is determined based on the target downlink reference signal; Wherein, the first indication information indicates any of the following: The first downlink reference signal serves as the associated downlink reference signal for the non-codebook SRS; The second downlink reference signal serves as the associated downlink reference signal for the non-codebook SRS; Both the first downlink reference signal and the second downlink reference signal can be used as associated downlink reference signals for the non-codebook SRS.

7. The method according to claim 6, wherein, When the first indication information indicates that the second downlink reference signal is used as the associated downlink reference signal of the non-codebook SRS, the second downlink reference signal is associated with the first downlink reference signal; Alternatively, when the first indication information indicates that the first downlink reference signal is used as the associated downlink reference signal of the non-codebook SRS, the first downlink reference signal is associated with the second downlink reference signal.

8. The method according to any one of claims 1 to 7, wherein, The terminal device determines the precoding information of the non-codebook SRS based on a first downlink reference signal or a second downlink reference signal, including: When the second downlink reference signal is used as the associated downlink reference signal of the non-codebook SRS, the terminal device determines the information of the channel associated with the antenna port associated with the first downlink reference signal and determines the precoding information of the non-codebook SRS according to the protocol agreement or the second indication information. The second downlink reference signal is associated with the first downlink reference signal.

9. The method according to any one of claims 1 to 7, wherein, The second instruction information indicates that the precoding information of the non-codebook SRS is calculated based on the channel information associated with the antenna port of the first downlink reference signal, and the terminal device calculates the precoding information of the non-codebook SRS based on the channel information associated with the antenna port of the first downlink reference signal. Alternatively, if the second indication information does not indicate the calculation of the precoding information of the non-codebook SRS based on the first downlink reference signal, or if the second indication information does not exist, the terminal device calculates the precoding information of the non-codebook SRS based on the second downlink reference signal.

10. The method according to claim 1, wherein, The non-codebook SRS is aperiodic and associated with aperiodic second downlink reference signal; The aperiodic non-codebook SRS is triggered by the first DCI, and the first DCI simultaneously triggers the aperiodic second downlink reference signal. The aperiodic second downlink reference signal is associated with the first downlink reference signal.

11. The method according to claim 10, wherein, The first downlink reference signal associated with the aperiodic second downlink reference signal is either periodic or semi-continuous.

12. The method according to claim 1, wherein, The non-codebook SRS is aperiodic and is associated with an aperiodic second downlink reference signal and an aperiodic first downlink reference signal; The aperiodic SRS is triggered by a first DCI, and the first DCI simultaneously triggers the aperiodic second downlink reference signal and the aperiodic first downlink reference signal.

13. The method according to any one of claims 1 to 12, wherein, Before the terminal device sends the non-codebook probe reference signal (SRS), the method further includes: The terminal device determines the precoding information of the non-codebook SRS based on the first downlink reference signal or the second downlink reference signal; The terminal device determines the precoding information of the non-codebook SRS based on a first downlink reference signal or a second downlink reference signal, including: The terminal device determines the precoding information of the non-codebook SRS based on the information of the channel associated with the first downlink reference signal antenna port or the information of the channel associated with the second downlink reference signal antenna port, according to the first timing information. The first timing information includes the timing relationship between the first downlink reference signal, the second downlink reference signal and at least two of the non-codebook SRS.

14. The method according to claim 13, wherein, The first timing information also includes at least one of the following: The time interval between the first downlink reference signal and the non-codebook SRS; The time interval between the second downlink reference signal and the non-codebook SRS; The time interval between the first downlink reference signal and the second downlink reference signal.

15. The method according to claim 13 or 14, wherein, The terminal device determines, based on the first timing information and either the first downlink reference signal or the second downlink reference signal, the precoding information of the non-codebook SRS, including: When the first condition is met, the terminal device determines the precoding information of the non-codebook SRS based on the information of the channel associated with the first downlink reference signal antenna port; Alternatively, when the second condition is met, the terminal device determines the precoding information of the non-codebook SRS based on the information of the channel associated with the second downlink reference signal antenna port.

16. The method according to claim 15, wherein, The first condition includes any one of the following: The time interval between the first downlink reference signal and the non-codebook SRS is greater than or equal to a first threshold, and / or the time interval between the first downlink reference signal and the non-codebook SRS is less than or equal to a second threshold; The time interval between the first downlink reference signal and the non-codebook SRS is less than the first threshold or greater than the second threshold, and the second downlink reference signal satisfies the third condition.

17. The method according to claim 16, wherein, The third condition includes at least one of the following: The time interval between the second downlink reference signal and the non-codebook SRS is greater than or equal to the first threshold, and / or the time interval between the second downlink reference signal and the non-codebook SRS is less than or equal to the second threshold; The second downlink reference signal is associated with the first downlink reference signal; The first downlink reference signal is transmitted before the second downlink reference signal, and the time interval between the first downlink reference signal and the second downlink reference signal is greater than or equal to a third threshold, and / or the time interval between the first downlink reference signal and the second downlink reference signal is less than or equal to a fourth threshold.

18. The method of claim 15, wherein the second condition comprises at least one of the following: The time interval between the first downlink reference signal and the non-codebook SRS is less than a first threshold, and / or the time interval between the first downlink reference signal and the non-codebook SRS is greater than a second threshold; The time interval between the first downlink reference signal and the non-codebook SRS is less than the first threshold or greater than the second threshold, and the second downlink reference signal does not meet the third condition; The time interval between the second downlink reference signal and the non-codebook SRS is greater than or equal to the fifth threshold, and / or less than or equal to the sixth threshold.

19. The method according to claim 15, wherein, The method further includes: When neither the first condition nor the second condition is met, the terminal device determines the precoding information determined by the third downlink reference signal as the precoding information of the non-codebook SRS, or it is not expected to update the precoding information of the non-codebook SRS. The third downlink reference signal is a downlink reference signal other than the first downlink reference signal and the second downlink reference signal.

20. The method according to any one of claims 1 to 19, wherein, The method further includes: The terminal device reports the second information; The second information is used to indicate the port information of the downlink reference signal used to determine the precoding information of the non-codebook SRS.

21. A communication method, the method further comprising: The network-side equipment sends a first downlink reference signal and a second downlink reference signal; The number of ports of the first downlink reference signal is greater than the number of ports of the second downlink reference signal, and the antenna ports associated with the first downlink reference signal include the antenna ports associated with the second downlink reference signal; The network-side device receives the non-codebook detection reference signal (SRS). The precoding information of the non-codebook SRS is determined based on the first downlink reference signal or the second downlink reference signal.

22. The method according to claim 21, wherein, The method further includes: The network-side device sends the first downlink control information (DCI); Wherein, the first DCI is used to trigger the non-codebook SRS and the second downlink reference signal; or, the first DCI is used to trigger the non-codebook SRS and trigger the second downlink reference signal and the first downlink reference signal.

23. The method according to claim 21 or 22, wherein, The non-codebook SRS is aperiodic and associated with aperiodic second downlink reference signal.

24. The method according to claim 23, wherein, The first downlink reference signal associated with the aperiodic second downlink reference signal is either periodic or semi-continuous.

25. The method according to any one of claims 21 to 24, wherein, The method further includes: The network-side device sends a first instruction message; Wherein, the first indication information indicates any of the following: The first downlink reference signal serves as the associated downlink reference signal for the non-codebook SRS; The second downlink reference signal serves as the associated downlink reference signal for the non-codebook SRS; Both the first downlink reference signal and the second downlink reference signal can be used as associated downlink reference signals for the non-codebook SRS.

26. The method of claim 25, wherein, When the first indication information indicates that the second downlink reference signal is used as the associated downlink reference signal of the non-codebook SRS, the second downlink reference signal is associated with the first downlink reference signal; Alternatively, when the first indication information indicates that the first downlink reference signal is used as the associated downlink reference signal of the non-codebook SRS, the first downlink reference signal is associated with the second downlink reference signal.

27. The method according to any one of claims 21 to 26, wherein, The method further includes: The network-side device sends a second indication information, which indicates the information of the channel associated with the antenna port of the first downlink reference signal to determine the precoding information of the non-codebook SRS. The second downlink reference signal is the associated downlink reference signal of the non-codebook SRS. The second indication information is carried via Radio Resource Control (RRC) signaling, Media Access Layer Control (MAC) CE, or Downlink Control Information (DCI).

28. The method according to claim 21, wherein, The first downlink reference signal and the second downlink reference signal are transmitted at different times, and the first downlink reference signal, the second downlink reference signal and the non-codebook SRS are transmitted on the same carrier.

29. A communication device, the device comprising: Sending module; The transmitting module is used to transmit a non-codebook detection reference signal (SRS), wherein the precoding information of the non-codebook SRS is determined based on a first downlink reference signal or a second downlink reference signal. Wherein, the number of ports of the first downlink reference signal is greater than the number of ports of the second downlink reference signal, and the antenna ports associated with the first downlink reference signal include the antenna ports associated with the second downlink reference signal.

30. The apparatus according to claim 29, wherein, The first downlink reference signal and the second downlink reference signal are received at different times, and the first downlink reference signal, the second downlink reference signal and the non-codebook SRS are received on the same carrier.

31. The apparatus according to claim 29 or 30, wherein, The port of the first downlink reference signal is associated with all antenna ports of the network-side device, and the port of the second downlink reference signal is associated with some antenna ports of the network-side device; Alternatively, the number of antenna ports of the network-side device associated with the port of the first downlink reference signal is greater than the number of antenna ports of the network-side device associated with the port of the second downlink reference signal.

32. The apparatus according to any one of claims 29 to 31, wherein, The device further includes: a processing module; The processing module is further configured to determine the precoding information of the non-codebook SRS based on the first downlink reference signal or the second downlink reference signal before sending the non-codebook probe reference signal SRS. The processing module is specifically used to perform any of the following: Based on the first channel information, the precoding information of the non-codebook SRS is determined, wherein the first channel information is the information of the channel associated with the antenna port of the first downlink reference signal; Based on the second channel information, the precoding information of the non-codebook SRS is determined, wherein the second channel information is the information of the channel associated with the antenna port of the second downlink reference signal.

33. The apparatus of claim 32, wherein, The first channel information is determined based on at least one of the following: Information measured from the first downlink reference signal; Information measured by the second downlink reference signal; Antenna port correlation information, which is determined based on the measurement information of the first downlink reference signal.

34. The apparatus according to any one of claims 29 to 33, wherein, The device further includes: a processing module; The processing module is configured to determine, based on the first indication information, either the first downlink reference signal or the second downlink reference signal as a target downlink reference signal associated with the non-codebook SRS, wherein the precoding information of the non-codebook SRS is determined based on the target downlink reference signal; Wherein, the first indication information indicates any of the following: The first downlink reference signal serves as the associated downlink reference signal for the non-codebook SRS; The second downlink reference signal serves as the associated downlink reference signal for the non-codebook SRS; Both the first downlink reference signal and the second downlink reference signal can be used as associated downlink reference signals for the non-codebook SRS.

35. The apparatus according to claim 34, wherein, When the first indication information indicates that the second downlink reference signal is used as the associated downlink reference signal of the non-codebook SRS, the second downlink reference signal is associated with the first downlink reference signal; Alternatively, when the first indication information indicates that the first downlink reference signal is used as the associated downlink reference signal of the non-codebook SRS, the first downlink reference signal is associated with the second downlink reference signal.

36. The apparatus according to any one of claims 29 to 35, wherein, Processing module, used for: When the second downlink reference signal is used as the associated downlink reference signal of the non-codebook SRS, the information of the channel associated with the antenna port associated with the first downlink reference signal is determined according to the protocol or the second indication information, and the precoding information of the non-codebook SRS is determined. The first downlink reference signal is associated with the second downlink reference signal.

37. The apparatus according to any one of claims 29 to 35, wherein, The second indication information indicates that the precoding information of the non-codebook SRS is calculated based on the channel information associated with the antenna port of the first downlink reference signal. Alternatively, if the second indication information does not indicate that the precoding information of the non-codebook SRS is calculated based on the first downlink reference signal, or if the second indication information does not exist, the precoding information of the non-codebook SRS is calculated based on the second downlink reference signal.

38. The apparatus of claim 29, wherein, The non-codebook SRS is aperiodic and associated with aperiodic second downlink reference signal; The aperiodic non-codebook SRS is triggered by the first DCI, and the first DCI simultaneously triggers the aperiodic second downlink reference signal. The aperiodic second downlink reference signal is associated with the first downlink reference signal.

39. The apparatus of claim 29, wherein, The non-codebook SRS is aperiodic and is associated with an aperiodic second downlink reference signal and an aperiodic first downlink reference signal; The aperiodic SRS is triggered by a first DCI, and the first DCI simultaneously triggers the aperiodic second downlink reference signal and the aperiodic first downlink reference signal.

40. The apparatus according to any one of claims 29 to 39, wherein, The processing module is further configured to determine the precoding information of the non-codebook SRS based on the first downlink reference signal or the second downlink reference signal before sending the non-codebook probe reference signal SRS; The processing module is specifically used to determine the information of the channel associated with the antenna port of the first downlink reference signal or the second downlink reference signal based on the first timing information, and to determine the precoding information of the non-codebook SRS. The first timing information includes the timing relationship between the first downlink reference signal, the second downlink reference signal and at least two of the non-codebook SRS.

41. A communication device, wherein, The device further includes: a transmitting module and a receiving module, wherein: The transmitting module is used to transmit a first downlink reference signal and a second downlink reference signal, wherein the second downlink reference signal is associated with the first downlink reference signal; the number of ports of the first downlink reference signal is greater than the number of ports of the second downlink reference signal, and the antenna ports associated with the first downlink reference signal include the antenna ports associated with the second downlink reference signal; The receiving module is used to receive the non-codebook detection reference signal (SRS). The precoding information of the non-codebook SRS is determined based on the first downlink reference signal or the second downlink reference signal.

42. The apparatus according to claim 41, wherein, The transmitting module is also used to transmit first downlink control information (DCI); Wherein, the first DCI is used to trigger the non-codebook SRS and the second downlink reference signal; or, the first DCI is used to trigger the non-codebook SRS and trigger the second downlink reference signal and the first downlink reference signal.

43. The apparatus according to claim 41 or 42, wherein, The sending module is also used to send first indication information; Wherein, the first indication information indicates any of the following: The first downlink reference signal serves as the associated downlink reference signal for the non-codebook SRS; The second downlink reference signal serves as the associated downlink reference signal for the non-codebook SRS; Both the first downlink reference signal and the second downlink reference signal can be used as associated downlink reference signals for the non-codebook SRS.

44. The apparatus according to claim 43, wherein, When the first indication information indicates that the second downlink reference signal is used as the associated downlink reference signal of the non-codebook SRS, the second downlink reference signal is associated with the first downlink reference signal; Alternatively, when the first indication information indicates that the first downlink reference signal is the associated downlink reference signal of the non-codebook SRS, the first downlink reference signal and the second downlink reference signal are associated.

45. A terminal device comprising a processor and a memory, the memory storing a program or instructions executable on the processor, the program or instructions, when executed by the processor, implementing the steps of the communication method as claimed in any one of claims 1 to 20.

46. ​​A network-side device, comprising a processor and a memory, the memory storing a program or instructions executable on the processor, the program or instructions, when executed by the processor, implementing the steps of the communication method as claimed in any one of claims 21 to 28.

47. A readable storage medium storing a program or instructions that, when executed by a processor, implement the communication method as claimed in any one of claims 1 to 20, or implement the steps of the communication method as claimed in any one of claims 21 to 28.

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