Communication method and device, storage medium and program product

Abstract

The embodiment of the invention provides a communication method and device, a storage medium and a program product, relates to the technical field of communication, and can reduce the load overhead of uplink precoding information transmission of each sub-band. The method is applied to a first node, and comprises: receiving compressed uplink sub-band channel state information (CSI) sent by a second node, the compressed uplink sub-band CSI being obtained by performing compression processing on an original uplink sub-band CSI by the second node, the uplink sub-band CSI being used for determining uplink precoding information of at least one sub-band; and recovering the compressed uplink sub-band CSI to obtain the recovered uplink sub-band CSI.

Description

Technical Field

[0001] The present disclosure relates to the field of communication technology, and in particular to a communication method, device, storage medium, and program product. Background Art

[0002] Currently, in a long-term evolution (LTE) system, due to the relatively small uplink bandwidth, terminal devices usually use the same precoding matrix across the entire uplink bandwidth, that is, one uplink precoding matrix corresponds to the entire uplink transmission bandwidth.

[0003] With the development of communication technology, in the new radio (NR) system, due to the relatively large uplink bandwidth, the channel characteristics of the air interface wireless channel at different frequency domain positions will have certain differences. This requires indicating an uplink precoding for each subband in the entire bandwidth, that is, each subband corresponds to an independent precoding matrix.

[0004] However, as the number of subbands increases, the number of precoding matrices that need to be indicated also increases, further increasing the overhead of transmitting uplink precoding information for each subband. Therefore, reducing the overhead of transmitting uplink precoding information for each subband has become a pressing technical issue. Summary of the Invention

[0005] The embodiments of the present disclosure provide a communication method, apparatus, storage medium, and program product, which can reduce the load overhead of uplink precoding information transmission for each subband.

[0006] On the one hand, a communication method is provided, which is applied to a first node and includes: receiving compressed uplink subband channel state information (CSI) sent by a second node, where the compressed uplink subband CSI is obtained by compressing the original uplink subband CSI by the second node, and the uplink subband CSI is used to determine uplink precoding information of at least one subband; and restoring the compressed uplink subband CSI to obtain restored uplink subband CSI.

[0007] On the other hand, a communication method is provided, which is applied to a second node, including: compressing the original uplink subband channel state information CSI to obtain compressed uplink subband CSI, where the uplink subband CSI is used to determine uplink precoding information of at least one subband; and sending the compressed uplink subband CSI to the first node.

[0008] On the other hand, a communication device is provided, which is applied to a first node. The device includes: a receiving module and a processing module.

[0009] The receiving module is configured to receive compressed uplink subband channel state information (CSI) sent by the second node. The compressed uplink subband CSI is obtained by compressing the original uplink subband CSI by the second node. The uplink subband CSI is used to determine uplink precoding information of at least one subband. The processing module is configured to restore the compressed uplink subband CSI to obtain restored uplink subband CSI.

[0010] On the other hand, a communication device is provided, which is applied to a second node. The device includes: a processing module and a sending module.

[0011] The processing module is used to compress the original uplink subband channel state information CSI to obtain compressed uplink subband CSI, where the uplink subband CSI is used to determine uplink precoding information of at least one subband; the sending module is used to send the compressed uplink subband CSI to the first node.

[0012] In yet another aspect, a communication device is provided, comprising: a memory and a processor. The memory and the processor are coupled. The memory is configured to store a computer program. When the processor executes the computer program, the communication method of any of the above embodiments is implemented.

[0013] On the other hand, a computer-readable storage medium is provided, on which computer program instructions are stored. When the computer program instructions are executed by a processor, the communication method of any of the above embodiments is implemented.

[0014] On the other hand, a computer program product is provided, which includes computer program instructions, and when the computer program instructions are executed, the communication method of any one of the above embodiments is implemented.

[0015] The embodiments of the present disclosure disclose that by compressing the uplink subband CSI corresponding to the uplink precoding information indicating at least one subband, the transmission load for the uplink subband CSI between the terminal side and the network side can be reduced, so that the terminal side can determine the uplink precoding information of each subband based on the compressed uplink subband CSI, thereby reducing the load overhead for the transmission of the uplink precoding information of each subband in the entire process. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] In order to more clearly illustrate the technical solutions in the present disclosure, the following briefly introduces the drawings required for use in some embodiments of the present disclosure. Obviously, the drawings described below are only drawings of some embodiments of the present disclosure. For ordinary technicians in this field, other drawings can also be obtained based on these drawings.

[0017] Figure 1 A schematic diagram of a communication system provided for some embodiments of the present disclosure;

[0018] Figure 2 A flowchart of a communication method provided in some embodiments of the present disclosure;

[0019] Figure 3 A schematic diagram of an uplink sub-band CSI transmission example provided in some embodiments of the present disclosure;

[0020] Figure 4 A schematic structural diagram of a first type of MACCE provided in some embodiments of the present disclosure;

[0021] Figure 5 A flowchart of another communication method provided in some embodiments of the present disclosure;

[0022] Figure 6 A flowchart of another communication method provided in some embodiments of the present disclosure;

[0023] Figure 7 A flowchart of another communication method provided in some embodiments of the present disclosure;

[0024] Figure 8 A schematic diagram of a communication device provided in some embodiments of the present disclosure Figure 1

[0025] Figure 9 A schematic diagram of a communication device provided in some embodiments of the present disclosure Figure 2 ;

[0026] Figure 10 A schematic diagram of a communication device provided in some embodiments of the present disclosure Figure 3 . DETAILED DESCRIPTION

[0027] The following will clearly and completely describe the technical solutions of this disclosure in conjunction with the accompanying drawings. Obviously, the embodiments described are only part of the embodiments of this disclosure, not all of them. All other embodiments obtained by ordinary technicians in this field based on the embodiments of this disclosure without making any creative efforts shall fall within the scope of protection of this disclosure.

[0028] It should be noted that in this disclosure, words such as "exemplary" or "for example" are used to indicate examples, illustrations, or descriptions. Any embodiment or design described in this disclosure as "exemplary" or "for example" should not be construed as being preferred or advantageous over other embodiments or designs. Rather, the use of words such as "exemplary" or "for example" is intended to present the relevant concepts in a concrete manner.

[0029] In the following, the terms "first" and "second" are used for descriptive purposes only and should not be understood to indicate or imply relative importance or implicitly specify the quantity of the technical features indicated. Therefore, a feature specified as "first" or "second" may explicitly or implicitly include one or more of the features.

[0030] In the description of this disclosure, unless otherwise specified, " / " means "or." For example, A / B can mean A or B. "And / or" in this document simply describes an association relationship between related objects, indicating that three relationships can exist. For example, "A and / or B" can mean: A exists alone, A and B exists simultaneously, and B exists alone. Furthermore, "at least one" means one or more, and "a plurality" means two or more.

[0031] In existing mobile communication systems, one uplink precoder corresponds to the entire uplink transmission bandwidth. Because channel characteristics vary across different frequency domain locations in the air interface wireless channel, a single uplink precoder indicated by a single transmission precoding matrix indicator (TPMI) for the entire bandwidth cannot effectively adapt to these differences. Using different precoding matrices at different frequency domain locations for uplink transmission can effectively adapt to these differences in channel characteristics across the wireless channel.

[0032] Therefore, subband uplink precoding is considered to solve the above problems. Subband uplink precoding means that each subband corresponds to an independent precoding matrix, but the load overhead of transmitting subband uplink precoding information over the air interface is very large.

[0033] That is, as the number of subbands increases, the number of precoding matrices that need to be indicated also increases, thereby increasing the load overhead of uplink precoding information transmission for each subband.

[0034] Therefore, how to reduce the load overhead of uplink precoding information transmission for each subband has become a technical problem that needs to be solved urgently.

[0035] Based on this, and to address the above-mentioned technical issues, embodiments of the present disclosure provide a communication method for use in scenarios involving uplink subband channel state information (CSI) transmission. By compressing the uplink subband CSI corresponding to uplink precoding information indicating at least one subband, the transmission load for the uplink subband CSI between the terminal side and the network side can be reduced. This allows the terminal side to determine uplink precoding information for each subband based on the compressed uplink subband CSI, thereby reducing the transmission load for the uplink precoding information for each subband throughout the entire process.

[0036] Similarly, the network can directly package and compress the uplink CSI information for each subband and send the compressed packet containing the uplink CSI information for each subband to the terminal. The terminal can then decompress the received compressed packet to obtain the uplink CSI information for each subband. This reduces the transmission overhead of the uplink CSI information for each subband between the terminal and the network.

[0037] It should be noted that the above-mentioned compression / decompression processing can be implemented through artificial intelligence (AI) / machine learning (ML) or non-AI methods.

[0038] Wherein, regardless of whether it is an AI method, the above-mentioned compression / decompression processing includes but is not limited to: a bilateral model method, a unilateral model method, and a multilateral model method.

[0039] Regardless of whether the bilateral model is implemented using AI, it can include at least one of the following processes: model training, model reasoning, data collection, and performance monitoring.

[0040] In the embodiments of the present disclosure, the network architecture of the mobile communication network (including but not limited to 2G, 3G, 4G, 5G and future mobile communication networks (such as the future evolution of the fifth generation mobile communication technology (5th generation mobile communication technology advanced, 5G-A), the sixth generation mobile communication technology (6th generation mobile communication technology, 6G)), and the seventh generation mobile communication technology (7th generation mobile communication technology, 7G))) can include at least a first communication node and a second communication node, and the first communication node and the second communication node can be referred to as the first node and the second node, respectively.

[0041] For example, Figure 1 , which is a schematic diagram of a communication system provided by an embodiment of the present disclosure, the communication system may include: a first node 101 and a second node 102 .

[0042] The second node 102 may obtain uplink subband CSI (i.e., original uplink subband CSI) indicating uplink precoding information of at least one subband in the entire bandwidth, and compress the obtained uplink subband CSI to obtain compressed uplink subband CSI. The second node 102 may then send the compressed uplink subband CSI to the first node 101, so that the first node 101 may decompress the compressed uplink subband CSI to obtain restored uplink subband CSI.

[0043] It should be noted that the first node 101 may be a terminal-side node, such as a passive IoT device, a tag, or a terminal, etc. The second node 102 may be a network-side node, such as a base station, an auxiliary node, or an intermediate node, etc.

[0044] Among them, the base station (BS) can be a base station or evolutionary node B (eNB or eNodeB) in LTE, long term evolution advanced (LTEA), a base station device (gNB) in a 5G network, or a base station in a future communication system. The base station can include various macro base stations, micro base stations, home base stations, wireless remote stations, reconfigurable intelligent surfaces (RISs), routers, relay stations, transmission and reception points (TRP), receivers, access points (AP), wireless fidelity (WIFI) devices and other network-side devices. The base station is sometimes also called a reader or reader used to communicate with the terminal.

[0045] The terminal can be a device with wireless transceiver function. The terminal can be a mobile phone, a tablet computer, a computer with wireless transceiver function, a virtual reality (VR) terminal, an augmented reality (AR) terminal, a wireless terminal in industrial control, a wireless terminal in self-driving, a wireless terminal in remote medical, a wireless terminal in smart grid, a wireless terminal in transportation safety, a wireless terminal in smart city, a wireless terminal in smart home, etc. The embodiments of the present disclosure do not limit the application scenarios. The terminal can sometimes also be called a user, user equipment (UE), A-IoT device, access terminal, UE unit, UE station, mobile station, mobile station, remote station, transmitter, remote terminal, mobile device, UE terminal, wireless communication device, UE agent or UE device, etc., and the embodiments of the present disclosure do not limit this.

[0046] It should be noted that Figure 1 This is just an example framework. Figure 1 The number of devices included in the Figure 1 In addition to the devices shown, the communication system may also include other devices, such as core network devices.

[0047] The application scenarios of the embodiments of the present disclosure are not limited. The system architecture and business scenarios described in the embodiments of the present disclosure are intended to more clearly illustrate the technical solutions of the embodiments of the present disclosure and do not constitute a limitation on the technical solutions provided by the embodiments of the present disclosure. It is understood by those skilled in the art that with the evolution of network architecture and the emergence of new business scenarios, the technical solutions provided by the embodiments of the present disclosure are also applicable to similar technical problems.

[0048] Figure 2 A flow chart of a communication method is shown, Figure 2 As shown, the communication method is applied to the first node, including:

[0049] S201: Receive compressed uplink subband CSI sent by a second node.

[0050] The compressed uplink sub-band CSI is obtained by compression processing of the original uplink sub-band CSI by the second node.

[0051] In the embodiment of the present disclosure, the uplink subband CSI is used to determine uplink precoding information of at least one subband in the entire bandwidth.

[0052] As a possible implementation method, an encoder of an artificial intelligence model is deployed in the second node, and a decoder of the artificial intelligence model is deployed in the first node.

[0053] The encoder is used to compress the original uplink sub-band CSI to obtain compressed uplink sub-band CSI, and transmit the compressed uplink sub-band CSI to the decoder in the first node through the second node.

[0054] The decoder is used to restore the compressed uplink sub-band CSI and output the restored uplink sub-band CSI (ie, the compressed uplink sub-band CSI is decoded to obtain the restored uplink sub-band CSI).

[0055] In some embodiments, when a first node receives compressed uplink subband CSI sent by a second node, the first node may receive the compressed uplink subband CSI in any of the following ways:

[0056] Method 1: The first node receives the compressed uplink subband CSI output by the coding model in the second node;

[0057] Mode 2: The first node receives layer 1 signaling sent by the second node and carrying the compressed uplink subband CSI;

[0058] Mode 3: The first node receives layer 2 signaling sent by the second node and carrying the compressed uplink subband CSI;

[0059] Mode 4: The first node receives layer 3 signaling sent by the second node and carrying the compressed uplink subband CSI.

[0060] S202: Restore the compressed uplink sub-band CSI to obtain restored uplink sub-band CSI.

[0061] The first node may restore the compressed uplink sub-band CSI based on a decompression process corresponding to the compression process of the second node to obtain restored uplink sub-band CSI.

[0062] As a possible implementation method, combined with the above-mentioned model deployment, the first node can restore the compressed uplink sub-band CSI based on the decoder of the artificial intelligence model to obtain the restored uplink sub-band CSI.

[0063] It should be noted that the first node may determine the uplink precoding information of each subband based on the recovered uplink subband CSI.

[0064] It can be understood that by compressing the uplink subband CSI indicating the uplink precoding information of at least one subband, the transmission load of the uplink subband CSI between the terminal side and the network side can be reduced, so that the terminal side can determine the uplink precoding information of each subband based on the compressed uplink subband CSI, thereby reducing the load overhead of the uplink precoding information transmission of each subband in the entire process.

[0065] In some embodiments, the uplink subband CSI may include at least one of the following 1.1-1.3:

[0066] 1.1. Time-frequency spatial channel information of the uplink subband (i.e., air interface wireless channel information);

[0067] 1.2. Time-frequency-spatial precoding information of the uplink subband;

[0068] 1.3. TPMI of the upstream sub-band.

[0069] In combination with the three states of the uplink subband CSI (ie, original uplink subband CSI, compressed uplink subband CSI, and restored uplink subband CSI), the uplink subband CSI in different states contains the same type of information.

[0070] Exemplarily, the original uplink subband CSI includes:

[0071] 1.1.1. Original uplink subband time-frequency-spatial channel information;

[0072] 1.2.1. Time-frequency-spatial precoding information of the original uplink subband;

[0073] 1.3.1. Original TPMI of the upstream subband.

[0074] Similarly, the compressed uplink subband CSI includes:

[0075] 1.1.2. Time-frequency-spatial channel information of the compressed uplink subband;

[0076] 1.2.2. Time-frequency-spatial precoding information of the compressed uplink subband;

[0077] 1.3.2. TPMI of the compressed uplink subband.

[0078] The recovered uplink sub-band CSI includes:

[0079] 1.1.3. Recovered time-frequency-spatial channel information of the uplink subband;

[0080] 1.2.3. The recovered time-frequency-spatial precoding information of the uplink subband;

[0081] 1.3.3. TPMI of the recovered uplink subband.

[0082] As a possible implementation, the time-frequency-spatial channel information of the uplink subband shown in 1.1 above may include: at least one of: time domain information, frequency domain information, and spatial domain information;

[0083] The time domain information includes: at least one of a symbol, a time slot, and a subframe;

[0084] The frequency domain information includes: at least one of subband information and resource block (RB) information;

[0085] The spatial domain information includes: at least one of information on the number of transmitting antenna ports, information on the number of uplink transmission layers, and amplitude and phase information of antenna ports.

[0086] As a possible implementation, the time-frequency-spatial channel information of the uplink subband shown in 1.1 and the time-frequency-spatial precoding information of the uplink subband shown in 1.2 are each indicated by at least one multidimensional matrix, and these multidimensional matrices satisfy the following characteristics 2.1-2.5:

[0087] 2.1. The first dimension of the multidimensional matrix corresponds to the antenna port information;

[0088] 2.2, the second dimension of the multidimensional matrix corresponds to the number of transmission layers;

[0089] 2.3. The third dimension of the multidimensional matrix corresponds to the frequency domain information;

[0090] 2.4, the fourth dimension of the multidimensional matrix corresponds to the time domain information;

[0091] 2.5. Each element of the multidimensional matrix includes at least one of the product of amplitude and phase, and a complex number.

[0092] Alternatively, the time-frequency-spatial domain channel information of the uplink subband shown in 1.1 and the time-frequency-spatial domain precoding information of the uplink subband shown in 1.2 are respectively indicated by a set of at least one multidimensional matrix, where each element in the set corresponds to the channel information of a time domain resource or the precoding information of a time domain resource;

[0093] The channel information of a time domain resource or the precoding information of a time domain resource is respectively indicated by a multidimensional matrix, and the multidimensional matrix satisfies the characteristics shown in 2.1, 2.2, 2.3, and 2.5 above.

[0094] Similarly, the TPMI of the uplink subband shown in 1.3 above is indicated by at least one multidimensional matrix, and these multidimensional matrices satisfy the following characteristics 3.1-3.3:

[0095] 3.1, the first dimension of the multidimensional matrix corresponds to the subband information;

[0096] 3.2, the second dimension of the multidimensional matrix corresponds to the time domain information;

[0097] 3.3. Each element of the multidimensional matrix corresponds to a TPMI.

[0098] In some embodiments, the uplink subband CSI may further include:

[0099] 1.4. Singular vectors of the uplink wireless channel matrix.

[0100] Wherein, the singular vector may include a left singular vector or a right singular vector,

[0101] As a possible implementation, the singular vectors of the uplink wireless channel matrix shown in 1.4 above may be indicated by at least one matrix, where each column of the matrix corresponds to a singular vector of the uplink wireless channel matrix;

[0102] Alternatively, the singular vectors of the uplink radio channel matrix shown in 1.4 above may be indicated by a set of at least one vector, where each element in the set corresponds to a singular vector of the uplink radio channel matrix.

[0103] In some embodiments, the uplink subband CSI may further include:

[0104] 1.5. Singular values of the uplink wireless channel matrix.

[0105] As a possible implementation, the singular values of the uplink radio channel matrix shown in 1.5 above may be indicated by at least one matrix, where each element on the diagonal of the matrix corresponds to a singular value of the uplink radio channel matrix.

[0106] That is, at least one matrix in the uplink subband CSI may correspond to a singular value of the uplink wireless channel matrix shown in 1.5 above, and each element on the diagonal of the matrix corresponds to a singular value of the uplink wireless channel.

[0107] In some embodiments, the uplink subband CSI may further include:

[0108] 1.6. A weighted sum of multiple basis vectors used to represent an uplink wireless channel matrix.

[0109] As a possible implementation method, the weighted sum of the multiple basis vectors shown in 1.6 above can be indicated by at least one matrix, the first dimension of the matrix corresponds to the antenna port information, the second dimension of the matrix corresponds to the number of transmission layers information, the third dimension of the matrix corresponds to the frequency domain information, and the fourth dimension of the matrix corresponds to the time domain information.

[0110] It should be noted that the basis vector may include at least one of the following: spatial sampling, beamforming, and weighted summing of multiple basis vectors: each basis vector is multiplied by a weight value and then the basis vectors multiplied by the weight value are summed.

[0111] In the following, with reference to a specific example, the original uplink subband CSI / compressed uplink subband CSI / recovered uplink subband CSI may include the following 4.1-4.6:

[0112] 4.1. At least one multidimensional matrix is used to represent an air interface wireless channel or precoding, wherein the first dimension of the matrix corresponds to antenna port information, the second dimension corresponds to the number of transmission layers, the third dimension corresponds to frequency domain information, and the fourth dimension corresponds to time domain information. Each element of the matrix includes at least one of the following: a complex number, an amplitude product, and a phase product.

[0113] 4.2. A set of at least one matrix is used to represent an air interface wireless channel or precoding. Each element in the set corresponds to a multidimensional matrix, corresponding to an air interface wireless channel or precoding of a time domain resource. The first dimension of the multidimensional matrix corresponds to antenna port information, the second dimension corresponds to the number of transmission layers, and the third dimension corresponds to frequency domain information. Each element of the matrix can be at least one of the following: a complex number, or a product of amplitude and phase.

[0114] 4.3. At least one matrix corresponds to a left singular vector or a right singular vector of an uplink wireless channel, and each column of the matrix corresponds to a left singular vector or a right singular vector of the uplink wireless channel matrix;

[0115] 4.4. At least one set of vectors corresponds to a left singular vector or a right singular vector of an uplink wireless channel, and each element in the set corresponds to a left singular vector or a right singular vector of an uplink wireless channel;

[0116] 4.5. At least one matrix corresponds to the singular values of the uplink wireless channel matrix, and each element on the diagonal of the matrix corresponds to a singular value of the uplink wireless channel;

[0117] 4.6. At least one matrix corresponds to the weighted sum of multiple basis vectors, where the first dimension of the matrix corresponds to antenna port information, the second dimension corresponds to the number of transmission layers, the third dimension corresponds to frequency domain information, and the fourth dimension corresponds to time domain information.

[0118] In the embodiment of the present disclosure, during the process of the first node receiving the compressed uplink subband CSI sent by the second node (i.e., S201), the first node may receive first indication information sent by the second node, wherein the first indication information is used to indicate the compressed uplink subband CSI.

[0119] In some embodiments, the first field in the first indication information is used to indicate compressed uplink sub-band CSI.

[0120] The size of the first field is determined according to the data volume of the compressed uplink sub-band CSI, and the data volume of the compressed uplink sub-band CSI is determined according to the number of sub-bands corresponding to the uplink sub-band CSI.

[0121] It should be noted that the compressed uplink subband CSI may include any number of subband information. The size of the first field used to indicate the compressed uplink subband CSI is variable. The information type of the first indication information includes but is not limited to downlink control information (DCI).

[0122] When the number of subbands corresponding to the compressed uplink subband CSI is the first number, the size of the first field in the DCI is the first size.

[0123] When the number of subbands corresponding to the compressed uplink subband CSI is the second number, the size of the first field in the DCI is the second size.

[0124] Exemplarily, when the compressed uplink sub-band CSI includes the CSI of one sub-band, the size of the first field in the DCI is 6 bits;

[0125] When the compressed uplink sub-band CSI includes CSIs of two sub-bands, the size of the first field in the DCI is 10 bits.

[0126] In combination with the above embodiment, the number of subbands corresponding to the compressed uplink subband CSI is determined according to the first configuration information sent by the second node.

[0127] Alternatively, the number of subbands corresponding to the compressed uplink subband CSI is indicated by the second field in the first indication information.

[0128] Alternatively, the number of subbands corresponding to the compressed uplink subband CSI is indicated by a frequency domain resource assignment field in the first indication information, and the frequency domain resource assignment field is used to determine the number of RBs occupied by a physical uplink shared channel (PUSCH).

[0129] As a possible implementation, taking the example where the number of subbands corresponding to the compressed uplink subband CSI is determined based on the first configuration information sent by the second node, the first configuration information may include at least one of the following 5.1 and 5.2:

[0130] 5.1. Number of subbands corresponding to the compressed uplink subband CSI;

[0131] 5.2. Size of the subband corresponding to the compressed uplink subband CSI;

[0132] The size of the subband corresponding to the compressed uplink subband CSI may be different from the size of the subband of the sounding reference signal (SRS), and the number of subbands corresponding to the compressed uplink subband CSI may be different from the number of subbands of the SRS.

[0133] That is, the subband granularity of the CSI indicated by the network side to the terminal side may be inconsistent with the subband granularity of the SRS sent by the terminal side to the network (ie, independent of each other), so that the network side can flexibly allocate subbands of different granularities for the uplink subband CSI.

[0134] For example, in conjunction with the above communication process, a UE (i.e., a first node) may receive first configuration information sent by a network (i.e., a second node), where the first configuration information includes information about the number of subbands in the compressed uplink subband CSI. The UE may then configure the number of subbands in the compressed uplink subband CSI. Thereafter, the UE may receive first indication information sent by the network, where the first indication information includes the compressed uplink subband CSI. The UE may then restore the compressed uplink subband CSI.

[0135] Optionally, the first configuration information may further include subband size information in the compressed uplink subband CSI. The UE may configure the subband size in the compressed uplink subband CSI based on the first configuration information, thereby determining the number of subbands in the compressed uplink subband CSI.

[0136] That is, the first node may divide the entire bandwidth based on the sub-band sizes, and thereby obtain the number of divided sub-bands.

[0137] In the embodiment of the present disclosure, the first configuration information may satisfy at least one of the following 6.1 and 6.2:

[0138] 6.1. At least one information element (IE) in the first configuration information is used to indicate the number or size of subbands corresponding to the compressed uplink subband CSI;

[0139] 6.2. The first configuration information includes at least one candidate set or list, where each element in the candidate set or list corresponds to the number or size of subbands corresponding to an uplink subband CSI. The first indication information indicates an element from the candidate set or list, indicating the number or size of subbands corresponding to the uplink subband CSI.

[0140] It should be noted that when the first indication information is DCI, the UE (i.e., the first node) already knows the number of subbands in the compressed uplink subband CSI before receiving the compressed uplink subband CSI, which is equivalent to the known total payload of the DCI, thereby reducing the overhead of the UE's blind detection of DCI.

[0141] As another possible implementation, taking the example where the number of subbands corresponding to the compressed uplink subband CSI is indicated by the frequency domain resource allocation field in the first indication information, the UE (i.e., the first node) may determine the number of subbands in the compressed uplink subband CSI based on the number of RBs occupied by the PUSCH. The frequency domain resource allocation field in the DCI is used to determine the RB resources occupied by the PUSCH.

[0142] For example, if the PUSCH occupies 10 RBs and the subband size is 5 RBs, the number of subbands in the compressed uplink subband CSI is 2.

[0143] In other embodiments, the first indication information may include a first part and a second part.

[0144] The first part is used to indicate the total payload of the second part, and the second part is used to indicate the compressed uplink sub-band CSI.

[0145] Optionally, the specific information type of the first indication information includes but is not limited to a two-segment DCI.

[0146] It should be noted that the first part and the second part in the first indication information are channel-coded independently of each other, and the correctness of decoding of one part does not affect the other part.

[0147] As a possible implementation manner, when the second part of the first indication information is decoded incorrectly, the first node may discard the second part of the first indication information and send the PUSCH only based on the first part of the first indication information.

[0148] The PUSCH sent by the first node based on the first part of the first indication information carries information about decoding errors in the second part of the first indication information.

[0149] In the embodiment of the present disclosure, the first part of the first indication information may include at least one of the following 7.1-7.3:

[0150] 7.1, PUSCH layer number information;

[0151] 7.2. First pre-coded codeword;

[0152] 7.3 Modulation and coding scheme (MCS) information.

[0153] In conjunction with the foregoing, the first node sending the PUSCH based on the first part of the first indication information may be in any of the following ways:

[0154] Method ①: The first node sends PUSCH based on the layer number information of PUSCH;

[0155] Mode ②: The first node sends a PUSCH based on the first precoding codeword;

[0156] Mode ③: The first node pre-processes the MCS information and sends the PUSCH based on the processed MCS information.

[0157] It should be noted that the first precoding codeword may be a default precoding codeword of the first node; or, the first precoding codeword may be determined by the first node according to the second configuration information sent by the second node.

[0158] Taking the case where the first precoding codeword is determined by the second configuration information as an example, the second configuration information may include at least one of the following 8.1 and 8.2:

[0159] 8.1. First pre-coded codeword;

[0160] 8.2. First precoding codebook: The first precoding codeword is selected from the first precoding codebook.

[0161] The UE (ie, the first node) sends the PUSCH using the first precoding codeword shown in 8.1 above only when the PUSCH is sent based on the first part of the first indication information.

[0162] Similarly, the UE selects a first precoding codeword from the first precoding codebook shown in 8.2 above to send the PUSCH only when the UE sends the PUSCH based on the first part of the first indication information.

[0163] In the embodiment of the present disclosure, the manner in which the first node selects the first precoding codeword from the first precoding codebook shown in 8.2 above may include at least one of the following 9.1-9.3:

[0164] 9.1. Randomly select a codeword from the first precoding codebook as a first precoding codeword;

[0165] 9.2. Using a codeword indicated by the first indication information (or other indication information) in the first precoding codebook as a first precoding codeword;

[0166] 9.3. Based on the codeword selection scheme indicated by the first indication information (or other indication information), select a first precoding codeword from the first precoding codebook.

[0167] The codeword selection scheme in 9.3 above may include at least one of the following 10.1 and 10.2:

[0168] 10.1. Select a codeword from the first precoding codebook based on the MCS information in the first part;

[0169] 10.2. Select a codeword from the first precoding codebook based on the MCS range corresponding to the MCS information in the first part and the mapping relationship in the second configuration information (or other configuration information), where the mapping relationship includes a mapping relationship between each codeword in the first precoding codebook and the MCS range.

[0170] For example, using the codeword selection scheme described in 10.2 above, the network (i.e., the second node) may send configuration information (e.g., second configuration information) to the UE (i.e., the first node). The configuration information includes a mapping between each codeword in the first precoding codebook and an MCS range. The UE may then determine the MCS range within which the MCS falls based on the MCS in the first part of the first indication information, and then determine the codeword based on the mapping between the MCS range and the codewords in the first precoding codebook.

[0171] For example, the first codeword in the default precoding codebook corresponds to MCS 0 to MCS 9, and the second codeword corresponds to MCS 10 to MCS 19. If the MCS in the first part of the two-segment DCI received by the UE is MCS 15, the UE selects the second codeword in the default precoding codebook.

[0172] As a possible implementation method, the MCS information in the first part shown in the above 7.3 can indicate an MCS. Then, in the process of the first node sending PUSCH based on the first part of the first indication information, the first node can send PUSCH based on the MCS with a reduced order.

[0173] Exemplarily, when the UE (ie, the first node) pre-processes the MCS information indicated by the first part of the first indication information and uses the processed MCS as the MCS of the PUSCH, the UE may reduce the received MCS by several levels as the MCS for sending the PUSCH.

[0174] The order of MCS reduction is determined according to the first indication information (or other indication information).

[0175] Alternatively, the order of MCS reduction is determined autonomously by the first node.

[0176] It should be noted that the modulation order corresponding to the MCS before the order is reduced is the same as the modulation order corresponding to the MCS after the order is reduced, and the code rate corresponding to the MCS before the order is reduced is different from the code rate corresponding to the MCS after the order is reduced.

[0177] In some embodiments, in the process of the first node receiving the compressed uplink subband CSI (i.e., S201) sent by the second node (or in the process of the first node receiving the first indication information sent by the second node), the first node can receive at least two physical downlink control channels (PDCCH) sent by the second node.

[0178] The DCI carried by the first of the at least two PDCCHs may include: PUSCH layer number information and / or MCS information, and the DCI carried by the second of the at least two PDCCHs carries compressed uplink subband CSI.

[0179] As a possible implementation manner, the DCI carried by the first PDCCH may further include at least one of the following 11.1 and 11.2:

[0180] 11.1. Control resource set (CORESET) information of the second PDCCH;

[0181] 11.2. Search space information of the second PDCCH.

[0182] In some embodiments, during the process of the first node receiving the compressed uplink subband CSI sent by the second node (i.e., S201), the first node may receive second indication information sent by the second node, where the second indication information is used to indicate a physical downlink shared channel (PDSCH), which carries the compressed uplink subband CSI. Subsequently, the first node may receive the PDSCH based on the second indication information to obtain the compressed uplink subband CSI.

[0183] The second indication information is capable of scheduling one PDSCH and one PUSCH simultaneously.

[0184] Exemplarily, the network (ie, the second node) may send a DCI to the UE (ie, the first node) for scheduling a PUSCH, and the DCI may schedule a PDSCH at the same time.

[0185] Among them, PDSCH carries compressed uplink subband CSI.

[0186] The PDSCH carries a second type of media access control-control element (MACCE), and the second type of MACCE carries compressed uplink subband CSI.

[0187] A radio resource control (RRC) message carried by the PDSCH, which carries the compressed uplink subband CSI. RRC messages include but are not limited to: RRC reconfiguration, RRC connection establishment message, and RRC connection recovery message.

[0188] In some embodiments, during the process in which the first node receives the compressed uplink subband CSI sent by the second node (ie, S201 ), the first node may receive the first type of physical channel sent by the second node.

[0189] The first type of physical channel carries the compressed uplink sub-band CSI, and the first type of physical channel does not carry other content except the compressed uplink sub-band CSI.

[0190] Alternatively, the first type of physical channel is used to carry layer 1 control signaling other than DCI, acknowledgment (ACK) and negative acknowledgment (NACK).

[0191] It should be noted that the time domain behaviors of the first type of physical channel include: periodic, semi-persistent, and aperiodic.

[0192] Taking the time domain behavior of the first type of physical channel as an example, which is periodic, the transmission opportunity of the first type of physical channel is periodic. During the transmission opportunity of the first type of physical channel, there may be transmission of the first type of physical channel, or there may not be transmission of the first type of physical channel.

[0193] Exemplarily, the UE (i.e., the first node) may receive third configuration information sent by the network (i.e., the second node), where the third configuration information includes configuration information of a periodic first type physical channel. Then, the UE may receive the first type physical channel. The configuration information of the periodic first type physical channel includes periodic transmission opportunities for transmitting the first type physical channel. Thereafter, the UE may receive the first type physical channel according to the periodic transmission opportunities, and in the case where the UE successfully decodes and receives the first type physical channel on the periodic transmission opportunities, the UE receives compressed uplink subband CSI. In the case where the UE cannot successfully decode the first type physical channel on the periodic transmission opportunities, the UE maintains the most recent compressed uplink subband CSI received on the last received basis.

[0194] Taking the time domain behavior of the first type of physical channel as semi-persistent as an example, the UE can receive the fourth configuration information of the semi-persistent first type of physical channel sent by the network. The fourth configuration information includes but is not limited to: layer 1 signaling for activating the semi-persistent first type of physical channel, layer 1 signaling for deactivating the semi-persistent first type of physical channel, and transmission opportunities of the first type of physical channel.

[0195] In which case, when the semi-persistent first-type physical channel is activated, the transmission characteristics of the first-type physical channel are consistent with those of the periodic first-type physical channel.

[0196] Taking the case where the time domain behavior of the first type of physical channel is aperiodic as an example, the UE may receive layer 1 signaling sent by the network to indicate transmission of the first type of physical channel, wherein the layer 1 signaling includes but is not limited to existing DCI and new types of DCI.

[0197] In some embodiments, the uplink subband CSI may include CSIs of multiple subbands. After the first node recovers the compressed uplink subband CSI to obtain recovered uplink subband CSI (ie, S202), the first node may receive the first subband information sent by the second node.

[0198] The first sub-band information is used to indicate the CSI of at least one sub-band in the restored uplink sub-band CSI.

[0199] That is, the network side stores and maintains the original uplink subband CSI, while the terminal side stores and maintains the recovered uplink subband CSI. If the terminal side needs to use a subband CSI from the recovered uplink subband CSI, the terminal side can receive subband information sent by the network side and be instructed which subband CSI from the recovered uplink subband CSI to use.

[0200] For example, Figure 3 As shown, the network (i.e., the second node) sends compressed uplink subband CSI for all subbands to the terminal (i.e., the first node) based on the original uplink subband CSI for all subbands, for the terminal to maintain or update the restored uplink subband CSI. The terminal can then restore the compressed uplink subband CSI for all subbands received from the network to obtain restored uplink subband CSI for all subbands. The terminal can then store and maintain the restored uplink subband CSI for all subbands.

[0201] Accordingly, the UE can receive the compressed uplink subband CSI for all subbands sent by the network. The UE can then recover the compressed uplink subband CSI. The UE can then store and maintain the recovered uplink subband CSI. The UE can then receive subband information indicated by the network. The UE can then determine the recovered uplink subband CSI corresponding to the subband information.

[0202] During the process of receiving the subband information indicated by the network and determining the recovered uplink subband CSI corresponding to the subband information, the UE may receive the DCI sent by the network for scheduling the PUSCH. The DCI includes information about the frequency domain resources occupied by the PUSCH. The UE may then determine, based on the frequency domain resource information occupied by the PUSCH, which subbands' recovered uplink subband CSI are used for PUSCH precoding.

[0203] Optionally, the process of the UE receiving the compressed uplink subband CSI of all subbands sent by the network may include at least one of the following methods a and b:

[0204] Method a: The UE receives compressed uplink subband CSI for all subbands based on the RRC message;

[0205] Mode b: The UE receives compressed uplink subband CSI of all subbands based on the MAC CE.

[0206] Optionally, the process of the UE receiving the subband information sent by the network may include at least one of the following methods (1) and (2):

[0207] Method (1): UE receives subband information based on MACCE;

[0208] Method (2): UE receives subband information based on DCI.

[0209] In some embodiments, the compressed uplink subband CSI may be carried by a first-type MAC CE, and the first-type MAC CE may meet at least one of the following 12.1-12.3:

[0210] 12.1. The first type of field in the first type of MAC CE is used to indicate the total number of subbands contained in the carrier bandwidth, indicating the total number of subbands contained in the carrier bandwidth;

[0211] 12.2. The second type of fields in the first type of MAC CE are used to indicate the subband index, where each second field indicates the index of a subband, and the number of second fields is equal to the total number of subbands;

[0212] 12.3. The third type of fields in the first type of MACCE are used to indicate the CSI of the subband corresponding to the compressed uplink subband CSI. Each third field indicates the compressed uplink subband CSI of a subband, where the number of third fields is equal to the total number of subbands.

[0213] That is, the process of the UE receiving the compressed uplink subband CSI for all subbands sent by the network may include: the UE receiving a type of MAC CE (e.g., a first type of MAC CE) identified by a MAC subheader including a logical channel ID (LCID). The UE determines, based on the MAC subheader including the LCID, that the MAC CE is a MAC CE for transmitting the compressed uplink subband CSI for all subbands.

[0214] As a possible implementation, the size of the first type of MAC CE is variable, including but not limited to the fields shown in the following 13.1-13.3:

[0215] 13.1. Subband Number Field: Indicates the number of subbands;

[0216] 13.2. Subband Index i Field: Indicates the index of the subband with index i. N is equal to the number of subbands indicated by the previous field. Subband index 0 corresponds to the first subband, subband index 1 corresponds to the second subband, and so on. Subband index N-1 corresponds to the Nth subband.

[0217] 13.3. Compressed Uplink Subband CSI Field Corresponding to Subband Index i: Indicates the compressed uplink subband CSI of subband index i.

[0218] Wherein N is a positive integer, and i includes 0 and a positive integer.

[0219] It should be noted that the number of subbands corresponding to the compressed uplink subband CSI is one or more, and the second type of field and the third type of field corresponding to the same subband are arranged adjacent to each other in the first type of MACCE.

[0220] That is to say, there is a one-to-one correspondence between the second category fields and the third category fields.

[0221] For example, Figure 4 As shown, it shows a schematic diagram of the structure of a first type of MACCE. Among them, the first field is the number of subbands, and the subsequent N field sets correspond to N subbands, and each field set includes a subband index and a compressed uplink subband CSI corresponding to the subband index. For example, the first field set includes: subband index 0 and the compressed uplink subband CSI corresponding to subband index 0, the second field set includes: subband index 1 and the compressed uplink subband CSI corresponding to subband index 1, and the Nth field set includes: subband index N-1 and the compressed uplink subband CSI corresponding to subband index N-1.

[0222] In some embodiments, the uplink subband CSI may further include:

[0223] 1.7. Correspondence between at least one sub-band and at least one TPMI.

[0224] After the first node recovers the compressed uplink subband CSI to obtain the recovered uplink subband CSI (ie, S202 ), the first node may receive the second subband information sent by the second node.

[0225] The second sub-band information is used to indicate the TPMI corresponding to at least one sub-band in the corresponding relationship shown in 1.7 above.

[0226] That is, the network side can configure the correspondence between subbands and TPMIs for the terminal side. Afterwards, the network side can indicate the subband information to the terminal side, so that the terminal side can determine the TPMI based on the indicated subband information and the correspondence between subbands and TPMIs.

[0227] It should be noted that the corresponding relationship shown in 1.7 above can satisfy at least one of the following 14.1 and 14.2:

[0228] 14.1. The corresponding relationship is a table of the corresponding relationship between a subband and a TPMI. Each row in the table corresponds to the corresponding relationship between a subband and a TPMI.

[0229] 14.2. The correspondence relationship is a set of correspondence relationships between a subband and a TPMI. Each element in the set corresponds to a correspondence relationship between a subband and a TPMI.

[0230] Optionally, the indication information indicating the correspondence between the subband and the TPMI may include at least one of the following: RRC reconfiguration, an RRC connection establishment message, and an RRC connection recovery message.

[0231] Optionally, the indication information indicating the subband information (ie, the second subband information) may include at least one of the following: DCI, MACCE.

[0232] The indication information indicating the subband information (i.e., the second subband information) may include, but is not limited to: a bitmap, where each bit represents a subband; the length of the bitmap is equal to the total number of subbands; and the value of each bit in the bitmap may be 0 or 1. A bit value of 1 indicates that the subband represented by the bit is indicated; a bit value of 0 indicates that the subband represented by the bit is not indicated.

[0233] Optionally, the manner of indicating the subband information (i.e., the second subband information) in a bitmap may include at least one of the following 15.1-15.3:

[0234] 15.1. All bits in the bitmap are 0, indicating that no subband is indicated;

[0235] 15.2. All bits in the bitmap are 1, indicating that all subbands are indicated;

[0236] 15.3. The bitmap has at least one bit with a value of 1, indicating that the subband represented by the bit with a value of 1 is indicated.

[0237] For example, the first bit on the right side of the bitmap indicates the first subband, the second bit on the right side indicates the second subband, and so on, with the first bit on the left indicating the last subband. When the first bit on the right side and the second bit on the right side of the bitmap are 1 and the values of the other bits are 0, it indicates that the first subband and the second subband are indicated.

[0238] In some embodiments, the artificial intelligence model deployed across the first node and the second node may be a transformer model, and the artificial intelligence model is trained based on the first type of SRS sent by the first node. A decoder of the artificial intelligence model is deployed in the first node, and an encoder of the artificial intelligence model is deployed in the second node. The decoder is used to decode the compressed uplink subband CSI to obtain the recovered uplink subband CSI, and the encoder is used to compress the original uplink subband CSI to obtain the compressed uplink subband CSI.

[0239] It should be noted that the data collection used for model training includes the original uplink subband CSI, where the original uplink subband CSI is obtained by the network side from the measurement of SRS. In order to ensure the training effect, it is necessary to ensure the quality of the SRS received on the network side, including the power of the received SRS. The higher the power of the received SRS, the more accurate the uplink wireless channel estimation. Since the maximum transmit power of the SRS has an upper limit, this upper limit is determined by the maximum transmit power on the terminal side. For example, when the UE is far away from the network node (for example, the base station), the power of the SRS received by the network may be relatively low, so that the accuracy of the original uplink subband CSI obtained by the channel estimation cannot be guaranteed, thereby affecting the training of the model.

[0240] In this way, in the above embodiment, the maximum transmit power of the first type of SRS is indicated by the third indication information sent by the second node.

[0241] The maximum transmission power of the first type of SRS is different from the maximum transmission power of the first node, and the maximum transmission power of the first type of SRS is not used for other channels or signals except the first type of SRS.

[0242] That is, the UE (i.e., the first node) may receive third indication information sent by the network (i.e., the second node), indicating a first maximum transmit power for the UE to transmit a first type of SRS; the UE transmits the first type of SRS based on the first maximum transmit power. The first type of SRS includes, but is not limited to, an SRS for data collection for model training; the first maximum transmit power is different from the UE's maximum transmit power; and the first maximum transmit power is not used for other physical channels or reference signals transmitted by the UE other than the SRS for data collection for model training.

[0243] As a possible implementation, the third indication information may satisfy at least one of the following 16.1 and 16.2:

[0244] 16.1. The third indication information is used to indicate that a power value (such as an absolute power value) is used as the maximum transmit power of the first type of SRS;

[0245] 16.2. The third indication information is used to indicate that the sum of an offset value and the maximum transmit power of the first node is used as the maximum transmit power of the first type of SRS;

[0246] The unit of the power value is watt or decibel milliwatt (dBm), and the offset value is a linear value or decibel value (dB).

[0247] That is, for the third indication information shown in 16.1 above, the third indication information may include an absolute power value. When the UE (ie, the first node) sends the first type of SRS, it may use this absolute power value instead of the UE maximum transmit power as the maximum transmit power.

[0248] Regarding the third indication information described in 16.2 above, the third indication information may include an offset value. When the UE (ie, the first node) sends the first type of SRS, it may use the UE maximum transmit power plus the offset value as the maximum transmit power.

[0249] In some embodiments, the direct transmission power of the first type of SRS transmitted by the first node may be indicated by fourth indication information sent by the second node.

[0250] The direct transmission power of the first type of SRS is not used for other channels or signals except the first type of SRS.

[0251] That is, the direct transmission power of the first type of SRS may be different from the reception power required by the network side.

[0252] In combination with the third indication information in 16.1 or 16.2 above, the fourth indication information may satisfy at least one of the following 17.1 and 17.2:

[0253] 17.1. The fourth indication information is used to indicate that a power value is used as the direct transmit power of the first type of SRS;

[0254] 17.2. The fourth indication information is used to indicate that the sum of an offset value and the transmit power of other types of SRS is used as the direct transmit power of the first type of SRS;

[0255] The unit of the power value is watt or decibel milliwatt (dBm), and the offset value is a linear value or decibel value (dB).

[0256] In some other embodiments, the artificial intelligence model is trained based on the second type of SRS sent by the first node, and the frequency domain characteristics of the second type of SRS may satisfy at least one of the following 18.1-18.5:

[0257] 18.1. The subband size of the second type of SRS is determined by the absolute number of RBs indicated by the second node; wherein the absolute number of RBs is independent of the pre-configured subband size candidate set;

[0258] 18.2. The subband size of the second type of SRS is one RB. The subband size of the second type of SRS is independent of the pre-configured subband size candidate set.

[0259] 18.3. The subband position of the second type of SRS is any position in the carrier bandwidth indicated by the second node, and the subband position of the second type of SRS is independent of the pre-configured or pre-determined subband position;

[0260] 18.4. The second type of SRS occupies all resource elements (REs) in one RB;

[0261] 18.5. The density of the second type of SRS is indicated by the second node and is irrelevant to the pre-configured density candidate set. The density of the second type of SRS is used to indicate the number of REs occupied in one RB.

[0262] As a possible implementation manner, the second type of SRS sent by the first node is indicated by sixth indication information sent by the second node.

[0263] Optionally, based on the second type of SRS, the artificial intelligence model is also trained based on the third type of SRS sent by the first node.

[0264] The third type of SRS satisfies at least one of the following 19.1 and 19.2:

[0265] 19.1. The third type of SRS is transmitted through at least one of all receive antenna ports (Rx) of the first node;

[0266] 19.2. The third type of SRS is transmitted through at least one port among all transmit antenna ports of the first node.

[0267] It should be noted that the ports used to send the third type of SRS among all receiving antenna ports and the ports used to send the third type of SRS among all transmitting antenna ports are indicated by the network (ie, the second node) to the UE (ie, the first node).

[0268] In addition, the third type of SRS sent by the first node is indicated by the seventh indication information sent by the second node.

[0269] In some embodiments, the UE (i.e., the first node) receives and measures a channel state information reference signal (CSI-RS) to obtain a downlink wireless channel for performance monitoring of the UE-side model. Based on the mutual benefit characteristics of the uplink and downlink channels, the UE can equate the downlink wireless channel to an uplink wireless channel for model performance monitoring. The UE pre-processes the downlink wireless channel to obtain downlink CSI, where the downlink CSI includes: downlink broadband CSI and downlink subband CSI. The UE uses the downlink CSI and the recovered uplink subband CSI to perform UE-side model performance monitoring.

[0270] The transmit antenna port and receive antenna port of a UE may be different. The transmit antenna port of a UE is used to transmit uplink channels or signals, including but not limited to: SRS, PUSCH; the receive antenna port of a UE is used to receive downlink channels or signals, including but not limited to: CSI-RS, PDSCH, PDCCH.

[0271] If the transmit antenna port and receive antenna port are inconsistent, the downlink and uplink radio channels are inconsistent. In this case, the downlink radio channel cannot be used for UE-side model performance monitoring. In this case, the downlink CSI and recovered uplink subband CSI cannot be used for UE-side model performance monitoring.

[0272] The situation where the transmit antenna port and the receive antenna port of the UE are inconsistent includes at least one of the following:

[0273] The UE's transmit antenna port and the UE's receive antenna port are independent of each other;

[0274] The transmit antenna port of the UE is part of the receive antenna port of the UE;

[0275] The receiving antenna ports of the UE are part of the transmitting antenna ports of the UE.

[0276] For example, a UE has two receive antenna ports, port 1 and port 2, and one transmit antenna port, port 3. In this case, the UE's transmit antenna port and receive antenna port are independent of each other. The downlink radio channel is the radio channel between the UE's port 1 and port 2 and the network-side antenna port; the uplink radio channel is the radio channel between the UE's port 3 and the network-side antenna port. Therefore, the uplink and downlink radio channels are independent of each other, so the downlink CSI and uplink subband CSI cannot be used for model performance monitoring.

[0277] For example, the UE has two receive antenna ports, the first port and the second port; the UE has one transmit antenna port, also the first port; that is, the first port is both a receive antenna port and a transmit antenna port. In this case, the UE's transmit antenna port and the UE's receive antenna port are inconsistent. At this time, the downlink wireless channel is the wireless channel between the UE's first and second ports and the network-side antenna port; the uplink wireless channel is the wireless channel between the UE's first port and the network-side antenna port. Therefore, the uplink wireless channel and the downlink wireless channel are inconsistent, and the downlink CSI and uplink subband CSI cannot be used for performance monitoring of the model.

[0278] Therefore, if the capability allows, the UE needs to use the transmit antenna port to receive CSI-RS to obtain downlink CSI for UE-side model performance monitoring.

[0279] Therefore, after the first node recovers the compressed uplink subband CSI to obtain recovered uplink subband CSI (ie, S202), the first node may receive the first type of CSI-RS.

[0280] The downlink CSI is used in combination with the recovered uplink subband CSI to perform performance monitoring on the first node side.

[0281] It should be noted that the first type of CSI-RS received by the first node is indicated by the eighth indication information sent by the second node, and the first type of CSI-RS is received through at least one transmitting antenna port of the first node.

[0282] As a possible implementation manner, before the first node uses the transmitting antenna port to receive the first type of CSI-RS, the first node needs to send capability information to the second node.

[0283] The capability information is used to indicate whether the first node supports receiving a first type of CSI-RS based on at least one transmitting antenna port.

[0284] That is to say, only when the capability information sent by the first node indicates that the first node supports receiving the first type of CSI-RS based on at least one transmitting antenna port, the second node sends the first type of CSI-RS to the first node, and the first node uses the transmitting antenna port to receive the first type of CSI-RS.

[0285] It should be noted that the first type of CSI-RS may meet any of the following 20.1-20.3:

[0286] 20.1. Periodic first type CSI-RS;

[0287] 20.2. Semi-persistent Type 1 CSI-RS;

[0288] 20.3. Aperiodic Type-1 CSI-RS.

[0289] Exemplarily, the UE (ie, the first node) receives eighth indication information sent by the network (the second node), where the eighth indication information indicates configuration information of the first type of CSI-RS.

[0290] If the configuration information indicated by the eighth indication information includes but is not limited to: the time domain behavior of the first type of CSI-RS is periodic, the period and offset of the first type of CSI-RS, the UE uses the transmitting antenna port to receive the first type of CSI-RS with the period shown in 20.1 above.

[0291] If the configuration information indicated by the eighth indication information includes but is not limited to: the time domain behavior of the first type of CSI-RS is semi-persistent, the period and offset of the first type of CSI-RS, the UE receives the ninth indication information sent by the network to activate the semi-persistent first type of CSI-RS as shown in 20.2 above, and uses the transmit antenna port to receive the semi-persistent first type of CSI-RS;

[0292] Alternatively, the UE receives the tenth indication information sent by the network to deactivate the semi-persistent first type CSI-RS shown in 20.2 above, and stops receiving the semi-persistent first type CSI-RS.

[0293] If the configuration information indicated by the eighth indication information includes but is not limited to: the time domain behavior of the first type of CSI-RS is non-periodic, the UE receives the eleventh indication information sent by the network to trigger the non-periodic first type CSI-RS shown in 20.3 above, and uses the transmitting antenna port to receive the non-periodic first type CSI-RS.

[0294] Optionally, after the first node recovers the compressed uplink subband CSI to obtain recovered uplink subband CSI (i.e., S202), the first node may also receive the original uplink subband CSI sent by the second node. The first node may then combine the original uplink subband CSI with the recovered uplink subband CSI to perform performance monitoring on the first node side.

[0295] That is, the original uplink subband CSI received by the first node is used in combination with the restored uplink subband CSI to perform performance monitoring at the first node side.

[0296] In some embodiments, after the first node recovers the compressed uplink subband CSI to obtain the recovered uplink subband CSI (i.e., S202), the first node may further send the recovered uplink subband CSI to the second node, so that the second node uses the recovered uplink subband CSI in combination with the original uplink subband CSI to perform performance monitoring on the second node side.

[0297] That is, the recovered uplink subband CSI is used in combination with the original uplink subband CSI to perform performance monitoring on the second node side.

[0298] It should be noted that the recovered uplink subband CSI is associated with one or more SRS resources, where these one or more SRS resources are associated with the original uplink subband CSI of the network (i.e., the second node), including: the UE (i.e., the first node) sends these one or more SRS resources for the network to obtain the original uplink subband CSI.

[0299] As a possible implementation, during the process of the first node sending the recovered uplink subband CSI to the second node, the first node may receive fifth indication information sent by the second node, where the fifth indication information is used to indicate the configuration (Config) of the first type CSI report (Report). Thereafter, the first node may send the recovered uplink subband CSI to the second node according to the configuration of the first type CSI report.

[0300] The configuration of the first type CSI report includes: the first type CSI report is associated with one or more SRS resources, and the one or more SRS resources are associated with the original uplink subband CSI.

[0301] Optionally, in the process of the first node sending the recovered uplink subband CSI to the second node according to the configuration of the first type CSI report, the first node may send the recovered uplink subband CSI to the second node according to the reporting quantity information in the configuration of the first type CSI report.

[0302] Exemplarily, the “CSI report configuration (CSI-ReportConfig)” RRC IE represents the configuration of the first type of CSI report, wherein the “report quantity (reportQuantity)” RRC IE in the “CSI-ReportConfig” represents the report quantity, which is configured as “ulSbCsi”, wherein “ulSbCsi” indicates that the UE sends the recovered uplink subband CSI.

[0303] In some embodiments, the first indication information in the above embodiment may be a DCI of format 0-1 or a DCI of format 0-2, and the optional field of the DCI may be used to indicate the compressed uplink subband CSI.

[0304] It should be noted that the optional fields of DCI are fields that can be included in the DCI planned in the existing relevant protocols, and the optional fields are used to indicate the information content preset in the existing relevant protocols when needed, and can be used to carry the compressed uplink sub-band CSI when the optional fields are not needed.

[0305] That is, some existing fields in the DCI format 0-1 or the DCI format 0-2 that are used to transmit other information can be used to transmit the compressed uplink subband CSI.

[0306] The optional fields may include any of the following fields 21.1-21.4:

[0307] 21.1. A field used to indicate SRS resource set indicator information (resource set indicator), such as the "SRS resource set indicator" field;

[0308] 21.2. A field for indicating second SRS resource indication information, such as a "Second SRS resourceindicator" field;

[0309] 21.3. Field used to indicate precoding information and number of transmission layers, such as the "Precoding information and number of layers" field;

[0310] 21.4. A field used to indicate second precoding information, such as a "Second Precoding information" field.

[0311] That is, when DCI is used to transmit compressed uplink sub-band CSI, the fields in DCI as shown in 21.1 to 21.4 above are commonly used to transmit the compressed uplink sub-band CSI.

[0312] As a possible implementation method, when the optional field is the field used to indicate precoding information and transmission layer number information as shown in 21.3 above, some bits in the optional field can continue to be used to indicate the transmission layer number information, while other bits can be used to indicate the compressed uplink subband CSI.

[0313] That is, the field used to indicate precoding information and the number of transmission layers is used to indicate the wideband TPMI. Therefore, when transmitting uplink subband CSI, this field does not need to indicate the wideband TPMI. However, this field also indicates the number of layers. Therefore, several bits need to be reserved for indicating the number of layers. For example, two bits are reserved for indicating the number of layers. In this case, the number of transmission layers can include: one, two, three, or four.

[0314] As a possible implementation, the optional field is used to indicate the compressed uplink subband CSI under conditions including at least one of the following 22.1-22.3:

[0315] 22.1. The sum of the bit length of the SRS resource set indication information and the bit length of the compressed uplink subband CSI in the field used to indicate the SRS resource set indication information is less than or equal to the maximum bit length of the field;

[0316] 22.2. The sum of the bit length of the second SRS resource indication information and the bit length of the compressed uplink subband CSI in the field used to indicate the second SRS resource indication information is less than or equal to the maximum bit length of the field;

[0317] 22.3. In the field used to indicate the second precoding information, the sum of the bit length of the second precoding information and the bit length of the compressed uplink sub-band CSI is less than or equal to the maximum bit length of the field.

[0318] Among them, the bit length of the field used to indicate the SRS resource set indication information is 2 bits, the bit length of the field used to indicate the second SRS resource indication information is 3 bits, the bit length of the field used to indicate the precoding information and the number of transmission layers information is 6 bits, and the bit length of the field used to indicate the second precoding information is 5 bits.

[0319] Alternatively, when the number of SRS resource sets for PUSCH codebook-based transmission configured on the first node is 1, any of the fields 21.1, 21.2, and 21.4 may carry the compressed uplink subband CSI for transmission.

[0320] Alternatively, when the number of SRS resource sets configured for PUSCH based on non-codebook transmission on the first node is 1, any of the fields 21.1, 21.2, and 21.4 may carry the compressed uplink subband CSI for transmission.

[0321] That is, when the UE (i.e., the first node) is configured with only one SRS resource set for codebook-based PUSCH transmission, or when the UE is configured with only one SRS resource set for non-codebook-based PUSCH transmission, the DCI containing the above fields is used to transmit compressed uplink subband CSI. Because in this case, the field for indicating the SRS resource set indication information, the field for indicating the second SRS resource indication information, the field for indicating the precoding information and the number of transmission layers, and the field for indicating the second precoding information are all 0 bits in length, that is, in this case, these fields will not be used.

[0322] However, in other cases, these fields will be used for different purposes, and the bit lengths of the above fields will also be used, so the UE has expectations for the lengths of these fields in the DCI. Therefore, the UE will not try new payload lengths when blindly detecting DCI, reducing the overhead of the UE blindly detecting DCI.

[0323] In some embodiments, after the first node recovers the compressed uplink subband CSI to obtain the recovered uplink subband CSI (i.e., S202), the first node can also monitor the performance of the first node side and / or the second node side by comparing the key performance indicator (KPI) of the communication method provided in the embodiment of the present disclosure with the KPI of the first communication method in the existing related technology.

[0324] The first communication method in the prior art may include the following steps:

[0325] Step 1: The first node receives the broadband TPMI sent by the second node.

[0326] The broadband TPMI is used to indicate the same TPMI corresponding to the entire bandwidth.

[0327] Step 2: The first node determines a transmission precoding matrix based on the broadband TPMI.

[0328] The following describes the model training, model reasoning, data collection, and performance monitoring of the artificial intelligence model in the embodiments of the present disclosure with reference to specific examples.

[0329] 1. Model training: Model training includes at least one of the following methods:

[0330] Method 1: Training a model on one side and transmitting the trained model to the other side, including at least one of the following: training a model on the network side (i.e., the second node), including an encoder and a decoder, and transmitting the decoder to the terminal side (i.e., the first node);

[0331] Alternatively, the model is trained on the terminal side, including the encoder and decoder, and the encoder is transmitted to the network side.

[0332] Method 2: When the encoder and decoder are deployed on different sides, both sides train the bilateral model simultaneously. The intermediate information of the two sides based on the air interface interactive training includes: the encoder of the model on the network side, the decoder on the terminal side, and the calculation results of the forward propagation or backward propagation based on the air interface transmission.

[0333] Method 3: Train the encoder and decoder of the model on one side and send the training dataset to the other side, including at least one of the following: train the encoder and decoder of the model on the network side and transmit the dataset to the terminal side; train the encoder and decoder of the model on the terminal side; transmit the dataset to the network side.

[0334] 2. Model Reasoning

[0335] The input of the model includes the original uplink subband CSI. The input of the model can be represented as the input of the encoder on the network side (ie, the second node).

[0336] In addition, the input of the model may also include an SRS sent by the terminal side (ie, the first node).

[0337] When the model input includes SRS, the network-side encoder preprocesses the SRS before implementing information compression. The preprocessing includes at least one of the following: obtaining an uplink wireless channel from the SRS; and obtaining an uplink subband CSI from the SRS.

[0338] It should be noted that the above-mentioned SRS can be indicated by at least one matrix (i.e., at least one matrix corresponds to the SRS of the subband), the first dimension of the matrix corresponds to antenna port information, the second dimension corresponds to frequency domain information, and the third dimension corresponds to time domain information. Each element of the matrix corresponds to the SRS.

[0339] As a possible implementation, during model inference, uplink subband CSI information is stored or maintained only on the network side. The network side sends compressed uplink subband CSI to the terminal side; the terminal side receives the compressed uplink subband CSI and recovers it.

[0340] 3. Data Collection: Different data are collected for different purposes, such as the various purposes listed in 23.1-23.3 below:

[0341] 23.1. Data collection for model training, including at least one of the following 24.1-24.5:

[0342] 24.1. Original uplink subband CSI, where the original uplink subband CSI and the recovered uplink subband CSI are used for training the encoder on the network side (i.e., the second node) and the decoder on the terminal side (i.e., the first node);

[0343] 24.2. Recovered uplink subband CSI. The original uplink subband CSI and the recovered uplink subband CSI are used for network-side encoder training and terminal-side decoder training.

[0344] 24.3. Compressed uplink subband CSI, where the compressed uplink subband CSI and the original uplink subband CSI are used for network-side encoder training; or, the compressed uplink subband CSI and the restored uplink subband CSI are used for terminal-side decoder training;

[0345] 24.4. Gradient information, where gradient information is used for simultaneous training of encoders and decoders on both sides when the encoder and decoder are deployed on different sides;

[0346] 24.5. SRS: The network side receives SRS to obtain uplink wireless channel or uplink subband CSI.

[0347] 23.2. Data collection for model inference includes: compressed uplink subband CSI. The network side sends the compressed uplink subband CSI to the terminal side for recovery of the uplink subband CSI on the terminal side.

[0348] 23.3. Data collection for performance monitoring shall include at least one of the following:

[0349] 25.1. Recovered uplink subband CSI. The recovered uplink subband CSI and the original uplink subband CSI are used for model performance monitoring on the network side.

[0350] 25.2. Original uplink subband CSI. The original uplink subband CSI and the recovered uplink subband CSI are used for model performance monitoring on the terminal side.

[0351] 25.3. CSI-RS: The terminal receives CSI-RS to estimate the downlink wireless channel, which is used for performance monitoring of the model on the terminal side.

[0352] It should be noted that the above performance indicators may include at least one of the following: direct indicators, indirect indicators, and data distribution.

[0353] Direct indicators include but are not limited to: correlation estimation; indirect indicators include but are not limited to KPI.

[0354] The correlation estimation includes but is not limited to: squared generalized cosine similarity (SGCS).

[0355] The KPIs include but are not limited to: throughput, spectrum efficiency, block error rate (BLER), and ACK / NACK.

[0356] The data distribution includes whether the data distribution of the training dataset is consistent with the data distribution of the inference dataset.

[0357] 4. Performance monitoring: Performance indicators: the same as the performance indicators in "Data Collection".

[0358] Performance monitoring methods include at least one of the following 26.1-26.6:

[0359] 26.1. The UE (i.e., the first node) receives the original uplink subband CSI sent by the network (i.e., the second node) for UE-side performance monitoring.

[0360] 26.2. The recovered uplink subband CSI sent by the UE to the network is used for network-side performance monitoring;

[0361] 26.3. The UE compares the KPIs of the uplink subband CSI compression method (i.e., the communication method provided in the embodiments of the present disclosure) and the uplink broadband TPMI method (i.e., the first communication method in the prior art) for performance monitoring.

[0362] 26.4. Network KPI comparison of uplink subband CSI compression method and uplink broadband TPMI method for performance monitoring;

[0363] 26.5. The UE compares the distribution of training data and the distribution of inference data for performance monitoring;

[0364] 26.6. The network compares the distribution of training data and the distribution of inference data for performance monitoring.

[0365] For example, the KPIs for comparing the uplink subband CSI compression method and the uplink wideband TPMI method shown in 26.3 and 26.4 above include throughput, spectral efficiency, BLER, and ACK / NACK. The KPIs for the uplink subband CSI compression method are monitored to see if they deteriorate compared to the uplink wideband TPMI method.

[0366] For another example, the comparison based on the training data distribution and the inference data distribution shown in 26.5 and 26.6 above includes, but is not limited to: comparing whether the data distribution of the training dataset is consistent with the data distribution of the inference dataset.

[0367] The following describes the artificial intelligence model in the embodiments of the present disclosure with reference to specific examples.

[0368] In one embodiment, the artificial intelligence model uses a transformer structure for uplink subband CSI compression. The encoder of the artificial intelligence model uses a transformer encoder structure, and the decoder of the artificial intelligence model uses a transformer encoder structure.

[0369] The transformer encoder structure includes: embedding layer module, positional encoding module, transformer block, and output linear layer module.

[0370] Among them, the transformer block includes but is not limited to: multi-head attention module, feedforward network module, and normalization module.

[0371] The encoder of the artificial intelligence model includes: at least one embedding layer module, at least one encoder position encoding module, at least two main body modules, and at least one encoding output module.

[0372] The decoder of the artificial intelligence model includes: at least one decoding input module, at least one decoder position encoding module, at least two main body modules, and at least one decoding output module.

[0373] The input of the encoder includes: a two-dimensional matrix with 80 rows and 16 columns; the output of the encoder includes: a vector with a size of 32.

[0374] The input of the embedding layer module includes: a two-dimensional matrix with 80 rows and 16 columns; the input dimensions of the embedding layer module include: a two-dimensional matrix with 1280 rows and 8 columns.

[0375] The input of the encoder position encoding module includes: a two-dimensional matrix with 1280 rows and 8 columns; the output of the encoder position encoding module includes: a two-dimensional matrix with 1280 rows and 8 columns.

[0376] The main module includes: at least two multi-head attention submodules and at least one residual network submodule. Each multi-head attention submodule includes at least: at least one query matrix, at least one label matrix, and at least one value matrix.

[0377] The query matrix is a two-dimensional matrix with 8 rows and 4 columns; the label matrix is a two-dimensional matrix with 8 rows and 4 columns; and the value matrix is a two-dimensional matrix with 8 rows and 4 columns.

[0378] The feedforward network submodule includes a first connection layer and a second connection layer. The first connection layer includes 1280 nodes, each of which includes a leaky ReLU function (an activation function). The second connection layer includes 320 nodes, each of which includes a leaky ReLU function. A residual connection is used between the input of the first connection layer and the output of the second connection layer.

[0379] The encoder output module includes a first encoding output layer and a second encoding output layer. The first encoding output layer includes 160 nodes. The second encoding output layer includes 32 nodes, each of which includes a Softmax function.

[0380] The input of the decoder includes: a vector of size 32; the output of the decoder includes: a two-dimensional matrix with 80 rows and 16 columns.

[0381] The decoder input module includes a first decoding input layer and a second decoding input layer. The first encoding output layer includes 32 nodes, each of which includes a Reinforced Luminance (ReLU) function. The second encoding output layer includes 320 nodes, each of which includes a leaky ReLU function. A residual connection is used between the input of the first decoding input layer and the output of the second decoding input layer.

[0382] The input of the decoder position encoding module includes: a vector with a length of 320; the output of the decoder position encoding module includes: a vector with a length of 320.

[0383] The embodiment of the present disclosure also provides a communication method, which is applied to a second node, such as Figure 5 As shown, the communication method may include:

[0384] S501: Compress the original uplink sub-band CSI to obtain compressed uplink sub-band CSI.

[0385] The uplink subband CSI is used to determine uplink precoding information of at least one subband.

[0386] It should be noted that, for the introduction of the uplink sub-band CSI and the compression processing process of the uplink sub-band CSI, reference may be made to the description in the above embodiments, which will not be repeated here.

[0387] S502: Send the compressed uplink subband CSI to the first node.

[0388] The communication method provided in the above embodiment is introduced below by taking the interaction between the first node and the second node as an example. Figure 6 Shown, including:

[0389] S601: The second node compresses the original uplink sub-band CSI to obtain compressed uplink sub-band CSI.

[0390] S602: The second node sends the compressed uplink subband CSI to the first node.

[0391] S603: The first node receives the compressed uplink subband CSI sent by the second node.

[0392] S604: The first node restores the compressed uplink sub-band CSI to obtain restored uplink sub-band CSI.

[0393] The following describes the interaction process between the first node and the second node in the communication method provided in the above embodiment with reference to a specific example, taking the first node as a terminal (such as UE) and the second node as a network (NW) as an example. Figure 7 Shown, including:

[0394] Step (1): The terminal sends a sounding reference signal to the network;

[0395] Step (2): The network obtains the original uplink sub-band CSI and compresses the original uplink sub-band CSI.

[0396] The network measures the SRS sent by the terminal to obtain the original uplink subband CSI.

[0397] Step (3): The network sends the compressed uplink sub-band CSI to the terminal.

[0398] Step (4): The terminal restores the compressed uplink sub-band CSI and obtains the restored uplink sub-band CSI.

[0399] It is understandable that, in order to implement the above functions, the communication device includes hardware structures and / or software modules corresponding to the execution of each function. It should be readily apparent to those skilled in the art that, in conjunction with the algorithmic steps of the various examples described in the embodiments of the present disclosure, the present disclosure can be implemented in the form of hardware or a combination of hardware and computer software. Whether a function is executed in the form of hardware or computer software driving hardware depends on the specific application and design constraints of the technical solution. Professional and technical personnel can use different methods to implement the described functions for each specific application, but such implementation should not be considered to be beyond the scope of the present disclosure.

[0400] The embodiments of the present disclosure can divide the functional modules of the communication device according to the above-mentioned method embodiments. For example, each functional module can be divided corresponding to each function, or two or more functions can be integrated into one functional module. The above-mentioned integrated modules can be implemented in the form of hardware or software. It should be noted that the division of modules in the embodiments of the present disclosure is schematic and is only a logical functional division. In actual implementation, there may be other division methods. The following is an example of dividing each functional module corresponding to each function.

[0401] Figure 8 This is a schematic diagram of the structure of a communication device provided by an embodiment of the present disclosure. Figure 1 , the communication device can be applied to the first node and perform the above Figure 2 The communication method shown, and Figure 6 The embodiment of the first node side. Figure 8 As shown, the communication device 800 includes: a receiving module 801 and a processing module 802.

[0402] A receiving module 801 is configured to receive compressed uplink subband channel state information (CSI) sent by a second node. The compressed uplink subband CSI is obtained by compressing the original uplink subband CSI by the second node. The uplink subband CSI is used to determine uplink precoding information for at least one subband. A processing module 802 is configured to restore the compressed uplink subband CSI to obtain restored uplink subband CSI.

[0403] In some embodiments, the uplink subband CSI includes at least one of the following:

[0404] Time-frequency-spatial channel information of the uplink subband;

[0405] Time-frequency-spatial precoding information of the uplink subband;

[0406] Transmit precoding matrix indication information TPMI of the uplink subband.

[0407] In some embodiments, the time-frequency-spatial channel information of the uplink subband includes: at least one of time-domain information, frequency-domain information, and spatial-domain information;

[0408] The time domain information includes: at least one of a symbol, a time slot, and a subframe;

[0409] The frequency domain information includes: at least one of subband information and resource block (RB) information;

[0410] The spatial domain information includes: at least one of information on the number of transmitting antenna ports, information on the number of uplink transmission layers, and amplitude and phase information of antenna ports.

[0411] In some embodiments, the time-frequency-spatial channel information of the uplink subband and the time-frequency-spatial precoding information of the uplink subband are respectively indicated by at least one multidimensional matrix, and the multidimensional matrix satisfies the following characteristics:

[0412] The first dimension of the multidimensional matrix corresponds to antenna port information;

[0413] The second dimension of the multidimensional matrix corresponds to the number of transmission layers;

[0414] The third dimension of the multidimensional matrix corresponds to the frequency domain information;

[0415] The fourth dimension of the multidimensional matrix corresponds to the time domain information;

[0416] Each element of the multi-dimensional matrix includes at least one of a product of an amplitude and a phase, and a complex number.

[0417] In some embodiments, the time-frequency-spatial domain channel information of the uplink subband and the time-frequency-spatial domain precoding information of the uplink subband are respectively indicated by a set of at least one multidimensional matrix, where each element in the set corresponds to the channel information of a time domain resource or the precoding information of a time domain resource;

[0418] The channel information of a time domain resource or the precoding information of a time domain resource is indicated by a multidimensional matrix, and the multidimensional matrix satisfies the following characteristics:

[0419] The first dimension of the multidimensional matrix corresponds to antenna port information;

[0420] The second dimension of the multidimensional matrix corresponds to the number of transmission layers;

[0421] The third dimension of the multidimensional matrix corresponds to the frequency domain information;

[0422] Each element of the multi-dimensional matrix includes at least one of a product of an amplitude and a phase, and a complex number.

[0423] In some embodiments, the TPMI of the uplink subband is indicated by at least one multidimensional matrix, and the multidimensional matrix satisfies the following characteristics:

[0424] The first dimension of the multidimensional matrix corresponds to the subband information;

[0425] The second dimension of the multidimensional matrix corresponds to the time domain information;

[0426] Each element of the multidimensional matrix corresponds to a TPMI.

[0427] In some embodiments, the uplink subband CSI further includes: a singular vector of an uplink wireless channel matrix, the singular vector including a left singular vector or a right singular vector;

[0428] The singular vectors of the uplink wireless channel matrix are indicated by at least one matrix, and each column of the matrix corresponds to a singular vector of the uplink wireless channel matrix; or,

[0429] The singular vectors of the uplink wireless channel matrix are indicated by a set of at least one vector, and each element in the set corresponds to a singular vector of the uplink wireless channel matrix.

[0430] In some embodiments, the uplink subband CSI further includes: singular values of an uplink wireless channel matrix, the singular values of the uplink wireless channel matrix are indicated by at least one matrix, and each element on the diagonal of the matrix corresponds to a singular value of the uplink wireless channel matrix.

[0431] In some embodiments, the uplink subband CSI further includes: a weighted sum of a plurality of basis vectors for characterizing an uplink wireless channel matrix;

[0432] The weighted sum of multiple basis vectors is indicated by at least one matrix, the first dimension of the matrix corresponds to antenna port information, the second dimension of the matrix corresponds to transmission layer number information, the third dimension of the matrix corresponds to frequency domain information, and the fourth dimension of the matrix corresponds to time domain information.

[0433] In some embodiments, the receiving module 801 is specifically configured to receive first indication information sent by the second node, where the first indication information is used to indicate compressed uplink subband CSI.

[0434] In some embodiments, the first field in the first indication information is used to indicate the compressed uplink subband CSI, and the size of the first field is determined according to the data amount of the compressed uplink subband CSI, and the data amount of the compressed uplink subband CSI is determined according to the number of subbands corresponding to the uplink subband CSI.

[0435] In some embodiments, the number of subbands corresponding to the compressed uplink subband CSI is determined according to the first configuration information sent by the second node; or,

[0436] The number of subbands corresponding to the compressed uplink subband CSI is indicated by the second field in the first indication information; or,

[0437] The number of subbands corresponding to the compressed uplink subband CSI is indicated by the frequency domain resource allocation field in the first indication information; the frequency domain resource allocation field is used to determine the number of RBs occupied by the physical uplink shared channel PUSCH.

[0438] In some embodiments, the first configuration information includes at least one of the following:

[0439] The number of subbands corresponding to the compressed uplink subband CSI;

[0440] The size of the subband corresponding to the compressed uplink subband CSI;

[0441] The size of the subband is different from the subband size of the sounding reference signal SRS.

[0442] In some embodiments, the first configuration information satisfies at least one of the following:

[0443] At least one information element IE in the first configuration information is used to indicate the number or size of subbands corresponding to the compressed uplink subband CSI;

[0444] The first configuration information includes at least one candidate set or list, each element in the candidate set or list corresponds to the number or size of subbands corresponding to an uplink subband CSI, wherein the first indication information indicates an element from the candidate set or list, indicating the number or size of subbands corresponding to the uplink subband CSI.

[0445] In some embodiments, the first indication information includes a first part and a second part, the first part is used to indicate the total payload of the second part, and the second part is used to indicate the compressed uplink sub-band CSI.

[0446] In some embodiments, the first part and the second part are channel coded independently of each other.

[0447] In some embodiments, the communication device 800 further includes: a sending module 803, configured to send a PUSCH based on the first part when an error occurs in decoding the second part.

[0448] In some embodiments, the PUSCH carries information about the second portion of decoding errors.

[0449] In some embodiments, the first portion includes at least one of the following:

[0450] PUSCH layer number information;

[0451] a first precoded codeword;

[0452] Modulation and coding scheme MCS information.

[0453] In some embodiments, the first precoding codeword is determined according to second configuration information sent by the second node.

[0454] In some embodiments, the second configuration information includes at least one of the following:

[0455] a first precoded codeword;

[0456] A first precoding codebook; wherein the first precoding codeword is selected from the first precoding codebook.

[0457] In some embodiments, a manner of selecting the first precoding codeword from the first precoding codebook includes at least one of the following:

[0458] Randomly selecting a codeword in the first precoding codebook as a first precoding codeword;

[0459] Using a codeword indicated by the first indication information in the first precoding codebook as a first precoding codeword;

[0460] Based on the codeword selection scheme indicated by the first indication information, a first precoding codeword is selected from the first precoding codebook.

[0461] In some embodiments, the codeword selection scheme includes at least one of the following:

[0462] Selecting a codeword from a first precoding codebook according to the MCS information in the first part;

[0463] A codeword is selected from the first precoding codebook according to the MCS range corresponding to the MCS information in the first part and the mapping relationship in the second configuration information, where the mapping relationship includes a mapping relationship between each codeword in the first precoding codebook and the MCS range.

[0464] In some embodiments, the MCS information in the first part indicates an MCS; the sending module 803 is specifically configured to send the PUSCH based on the MCS with a reduced order.

[0465] In some embodiments, the order of MCS reduction is determined according to the first indication information; or, the order of MCS reduction is determined by the first node.

[0466] In some embodiments, the modulation order corresponding to the MCS before the order reduction is the same as the modulation order corresponding to the MCS after the order reduction, and the code rate corresponding to the MCS before the order reduction is different from the code rate corresponding to the MCS after the order reduction.

[0467] In some embodiments, the receiving module 801 is specifically configured to receive at least two physical downlink control channels (PDCCHs) sent by the second node;

[0468] The DCI carried by the first PDCCH of the at least two PDCCHs includes: PUSCH layer number information and / or MCS information, and the DCI carried by the second PDCCH of the at least two PDCCHs carries compressed uplink subband CSI.

[0469] In some embodiments, the DCI carried by the first PDCCH further includes at least one of the following:

[0470] Control resource set information of the second PDCCH;

[0471] Search space information of the second PDCCH.

[0472] In some embodiments, the receiving module 801 is specifically used to receive second indication information sent by the second node, where the second indication information is used to indicate a physical downlink shared channel PDSCH, which carries the compressed uplink subband CSI; the receiving module 801 is also used to receive the PDSCH based on the second indication information to obtain the compressed uplink subband CSI.

[0473] In some embodiments, the second indication information is capable of scheduling one PDSCH and one PUSCH simultaneously.

[0474] In some embodiments, the receiving module 801 is specifically used to receive a first type physical channel sent by the second node, where the first type physical channel carries compressed uplink subband CSI, and the first type physical channel does not carry other content except the compressed uplink subband CSI.

[0475] In some embodiments, the uplink subband CSI includes CSI of multiple subbands; the receiving module 801 is further used to receive first subband information sent by the second node, where the first subband information is used to indicate CSI of at least one subband in the recovered uplink subband CSI.

[0476] In some embodiments, the compressed uplink subband CSI is carried by a first-type media access control element (MACCE), and the first-type MACCE satisfies at least one of the following conditions:

[0477] The first type of field in the first type of MACCE is used to indicate the total number of subbands included in the carrier bandwidth;

[0478] The second type of field in the first type of MACCE is used to indicate the subband index;

[0479] The third type of field in the first type of MAC CE is used to indicate the CSI of the subband corresponding to the compressed uplink subband CSI.

[0480] In some embodiments, the number of subbands corresponding to the compressed uplink subband CSI is one or more, and the second type of field and the third type of field corresponding to the same subband are arranged adjacent to each other in the first type of MAC CE.

[0481] In some embodiments, the uplink subband CSI includes a correspondence between at least one subband and at least one TPMI; the receiving module 801 is further configured to receive second subband information sent by the second node, where the second subband information is used to indicate the TPMI corresponding to at least one subband in the correspondence.

[0482] In some embodiments, the corresponding relationship satisfies at least one of the following:

[0483] The correspondence is a table of the correspondence between a subband and a TPMI. Each row in the table corresponds to the correspondence between a subband and a TPMI.

[0484] The correspondence relationship is a set of correspondence relationships between a sub-band and a TPMI, and each element in the set corresponds to a correspondence relationship between a sub-band and a TPMI.

[0485] In some embodiments, a decoder of an artificial intelligence model is deployed in the first node, and an encoder of an artificial intelligence model is deployed in the second node. The decoder is used to decode the compressed uplink subband CSI to obtain the recovered uplink subband CSI, and the encoder is used to compress the original uplink subband CSI to obtain the compressed uplink subband CSI.

[0486] In some embodiments, the artificial intelligence model is trained based on a first type of SRS sent by the first node, and the maximum transmit power of the first type of SRS is indicated by third indication information sent by the second node;

[0487] The maximum transmission power of the first type of SRS is different from the maximum transmission power of the first node, and the maximum transmission power of the first type of SRS is not used for other channels or signals except the first type of SRS.

[0488] In some embodiments, the third indication information is used to indicate that a power value is used as the maximum transmit power of the first type of SRS; or, the third indication information is used to indicate that a sum of an offset value and the maximum transmit power of the first node is used as the maximum transmit power of the first type of SRS;

[0489] The unit of the power value is watt or decibel milliwatt dBm, and the offset value is a linear value or decibel value dB.

[0490] In some embodiments, the direct transmission power of the first type of SRS transmitted by the first node is indicated by fourth indication information sent by the second node;

[0491] The direct transmission power of the first type of SRS is not used for other channels or signals except the first type of SRS.

[0492] In some embodiments, the fourth indication information is used to indicate that a power value is used as the direct transmit power of the first type of SRS; or, the fourth indication information is used to indicate that the sum of an offset value and the transmit power of other types of SRS is used as the direct transmit power of the first type of SRS;

[0493] The unit of the power value is watt or decibel milliwatt dBm, and the offset value is a linear value or decibel value dB.

[0494] In some embodiments, the artificial intelligence model is trained based on the second type of SRS sent by the first node, and the frequency domain characteristics of the second type of SRS satisfy at least one of the following:

[0495] The subband size of the second type of SRS is one RB, and the subband size of the second type of SRS is irrelevant to the pre-configured subband size candidate set;

[0496] The subband position of the second type of SRS is any position in the carrier bandwidth, and the subband position of the second type of SRS is independent of a pre-configured or pre-determined subband position;

[0497] The second type of SRS occupies all resource elements RE in one RB;

[0498] The density of the second type of SRS is irrelevant to the preconfigured density candidate set, and the density of the second type of SRS is used to indicate the number of REs occupied in one RB.

[0499] In some embodiments, the artificial intelligence model is trained based on a third type of SRS sent by the first node, where the third type of SRS is transmitted through at least one port among all receive antenna ports of the first node.

[0500] In some embodiments, the receiving module 801 is further used to receive a first type of channel state information reference signal CSI-RS; the processing module 802 is further used to obtain downlink CSI based on the first type of CSI-RS, and the downlink CSI is used to perform performance monitoring on the first node side in combination with the recovered uplink subband CSI.

[0501] In some embodiments, the first type of CSI-RS is received via at least one transmit antenna port of the first node.

[0502] In some embodiments, the sending module 803 is further configured to send capability information to the second node, where the capability information is used to indicate whether the first node supports receiving a first type of CSI-RS based on at least one transmitting antenna port.

[0503] In some embodiments, the receiving module 801 is further configured to receive original uplink subband CSI sent by the second node, where the original uplink subband CSI is used in combination with the recovered uplink subband CSI to perform performance monitoring on the first node side.

[0504] In some embodiments, the sending module 803 is further configured to send the recovered uplink subband CSI to the second node;

[0505] The recovered uplink sub-band CSI is used in combination with the original uplink sub-band CSI to perform performance monitoring on the second node side.

[0506] In some embodiments, the receiving module 801 is further used to receive fifth indication information sent by the second node, where the fifth indication information is used to indicate the configuration of the first type of CSI report; the sending module 803 is specifically used to send the recovered uplink subband CSI to the second node according to the configuration of the first type of CSI report.

[0507] In some embodiments, the configuration of the first type CSI report includes: the first type CSI report is associated with one or more SRS resources, and the one or more SRS resources are associated with the original uplink subband CSI.

[0508] In some embodiments, the sending module 803 is specifically configured to send the recovered uplink subband CSI to the second node according to the reporting amount information in the configuration of the first type CSI report.

[0509] In some embodiments, the processing module 802 is further configured to monitor the performance of the first node side and / or the second node side by comparing the key performance indicator KPI of the communication method with the KPI of the first communication method;

[0510] The first communication method includes:

[0511] receiving a broadband TPMI sent by the second node, where the broadband TPMI is used to indicate the same TPMI corresponding to the entire bandwidth;

[0512] The transmit precoding matrix is determined based on the wideband TPMI.

[0513] In some embodiments, the first indication information is downlink control information DCI of format 0-1 or DCI of format 0-2. The optional field of the DCI is used to indicate the compressed uplink subband CSI. The optional field includes at least one of the following:

[0514] A field used to indicate SRS resource set indication information;

[0515] A field used to indicate second SRS resource set indication information;

[0516] A field used to indicate precoding information and the number of transmission layers;

[0517] A field used to indicate second precoding information.

[0518] In some embodiments, the conditions under which the optional field is used to indicate compressed uplink subband CSI include at least one of the following:

[0519] The sum of the bit length of the SRS resource set indication information and the bit length of the compressed uplink subband CSI in the field used to indicate the SRS resource set indication information is less than or equal to the maximum bit length of the field;

[0520] The sum of the bit length of the second SRS resource indication information and the bit length of the compressed uplink subband CSI in the field used to indicate the second SRS resource indication information is less than or equal to the maximum bit length of the field;

[0521] The sum of the bit length of the second precoding information in the field used to indicate the second precoding information and the bit length of the compressed uplink sub-band CSI is less than or equal to the maximum bit length of the field.

[0522] In some embodiments, the optional field is a field used to indicate precoding information and transmission layer number information, some bits in the optional field are used to indicate the transmission layer number information, and other bits are used to indicate compressed uplink subband CSI.

[0523] Figure 9 This is a schematic diagram of the structure of a communication device provided by an embodiment of the present disclosure. Figure 2 , the communication device can be applied to the second node and perform the above Figure 5 The communication method shown, and Figure 6 The embodiment of the second node side. Figure 9 As shown, the communication device 900 includes: a processing module 901 and a sending module 902.

[0524] The processing module 901 is used to compress the original uplink subband channel state information CSI to obtain compressed uplink subband CSI, where the uplink subband CSI is used to determine uplink precoding information of at least one subband; the sending module 902 is used to send the compressed uplink subband CSI to the first node.

[0525] In some embodiments, the uplink subband CSI includes at least one of the following:

[0526] Time-frequency-spatial channel information of the uplink subband;

[0527] Time-frequency-spatial precoding information of the uplink subband;

[0528] Transmit precoding matrix indication information TPMI of the uplink subband.

[0529] In some embodiments, the time-frequency-spatial channel information of the uplink subband includes: at least one of time-domain information, frequency-domain information, and spatial-domain information;

[0530] The time domain information includes: at least one of a symbol, a time slot, and a subframe;

[0531] The frequency domain information includes: at least one of subband information and resource block (RB) information;

[0532] The spatial domain information includes: at least one of information on the number of transmitting antenna ports, information on the number of uplink transmission layers, and amplitude and phase information of antenna ports.

[0533] In some embodiments, the time-frequency-spatial channel information of the uplink subband and the time-frequency-spatial precoding information of the uplink subband are respectively indicated by at least one multidimensional matrix, and the multidimensional matrix satisfies the following characteristics:

[0534] The first dimension of the multidimensional matrix corresponds to antenna port information;

[0535] The second dimension of the multidimensional matrix corresponds to the number of transmission layers;

[0536] The third dimension of the multidimensional matrix corresponds to the frequency domain information;

[0537] The fourth dimension of the multidimensional matrix corresponds to the time domain information;

[0538] Each element of the multi-dimensional matrix includes at least one of a product of an amplitude and a phase, and a complex number.

[0539] In some embodiments, the time-frequency-spatial domain channel information of the uplink subband and the time-frequency-spatial domain precoding information of the uplink subband are respectively indicated by a set of at least one multidimensional matrix, where each element in the set corresponds to the channel information of a time domain resource or the precoding information of a time domain resource;

[0540] The channel information of a time domain resource or the precoding information of a time domain resource is indicated by a multidimensional matrix, and the multidimensional matrix satisfies the following characteristics:

[0541] The first dimension of the multidimensional matrix corresponds to antenna port information;

[0542] The second dimension of the multidimensional matrix corresponds to the number of transmission layers;

[0543] The third dimension of the multidimensional matrix corresponds to the frequency domain information;

[0544] Each element of the multi-dimensional matrix includes at least one of a product of an amplitude and a phase, and a complex number.

[0545] In some embodiments, the TPMI of the uplink subband is indicated by at least one multidimensional matrix, and the multidimensional matrix satisfies the following characteristics:

[0546] The first dimension of the multidimensional matrix corresponds to the subband information;

[0547] The second dimension of the multidimensional matrix corresponds to the time domain information;

[0548] Each element of the multidimensional matrix corresponds to a TPMI.

[0549] In some embodiments, the uplink subband CSI further includes: a singular vector of an uplink wireless channel matrix, the singular vector including a left singular vector or a right singular vector;

[0550] The singular vectors of the uplink wireless channel matrix are indicated by at least one matrix, and each column of the matrix corresponds to a singular vector of the uplink wireless channel matrix; or,

[0551] The singular vectors of the uplink wireless channel matrix are indicated by a set of at least one vector, and each element in the set corresponds to a singular vector of the uplink wireless channel matrix.

[0552] In some embodiments, the uplink subband CSI further includes: singular values of an uplink wireless channel matrix, the singular values of the uplink wireless channel matrix are indicated by at least one matrix, and each element on the diagonal of the matrix corresponds to a singular value of the uplink wireless channel matrix.

[0553] In some embodiments, the uplink subband CSI further includes: a weighted sum of a plurality of basis vectors for characterizing an uplink wireless channel matrix;

[0554] The weighted sum of multiple basis vectors is indicated by at least one matrix, the first dimension of the matrix corresponds to antenna port information, the second dimension of the matrix corresponds to transmission layer number information, the third dimension of the matrix corresponds to frequency domain information, and the fourth dimension of the matrix corresponds to time domain information.

[0555] In some embodiments, the sending module 902 is specifically configured to send first indication information to the first node, where the first indication information is used to indicate the compressed uplink subband CSI.

[0556] In some embodiments, the first field in the first indication information is used to indicate the compressed uplink subband CSI, and the size of the first field is determined according to the data amount of the compressed uplink subband CSI, and the data amount of the compressed uplink subband CSI is determined according to the number of subbands corresponding to the uplink subband CSI.

[0557] In some embodiments, the number of subbands corresponding to the compressed uplink subband CSI is determined according to the first configuration information sent by the second node; or,

[0558] The number of subbands corresponding to the compressed uplink subband CSI is indicated by the second field in the first indication information; or,

[0559] The number of subbands corresponding to the compressed uplink subband CSI is indicated by the frequency domain resource allocation field in the first indication information; the frequency domain resource allocation field is used to determine the number of RBs occupied by the physical uplink shared channel PUSCH.

[0560] In some embodiments, the first configuration information includes at least one of the following:

[0561] The number of subbands corresponding to the compressed uplink subband CSI;

[0562] The size of the subband corresponding to the compressed uplink subband CSI;

[0563] The size of the subband is different from the subband size of the sounding reference signal SRS.

[0564] In some embodiments, the first configuration information satisfies at least one of the following:

[0565] At least one information element IE in the first configuration information is used to indicate the number or size of subbands corresponding to the compressed uplink subband CSI;

[0566] The first configuration information includes at least one candidate set or list, each element in the candidate set or list corresponds to the number or size of subbands corresponding to an uplink subband CSI, wherein the first indication information indicates an element from the candidate set or list, indicating the number or size of subbands corresponding to the uplink subband CSI.

[0567] In some embodiments, the first indication information includes a first part and a second part, the first part is used to indicate the total payload of the second part, and the second part is used to indicate the compressed uplink sub-band CSI.

[0568] In some embodiments, the first part and the second part are channel coded independently of each other.

[0569] In some embodiments, the communication device 900 further includes: a receiving module 903, configured to receive a PUSCH sent by the first node based on the first part when the first node determines that the second part is decoded incorrectly.

[0570] In some embodiments, the PUSCH carries information about the second portion of decoding errors.

[0571] In some embodiments, the first portion includes at least one of the following:

[0572] PUSCH layer number information;

[0573] a first precoded codeword;

[0574] Modulation and coding scheme MCS information.

[0575] In some embodiments, the first precoding codeword is determined according to second configuration information sent by the second node.

[0576] In some embodiments, the second configuration information includes at least one of the following:

[0577] a first precoded codeword;

[0578] A first precoding codebook; wherein the first precoding codeword is selected from the first precoding codebook.

[0579] In some embodiments, a manner of selecting the first precoding codeword from the first precoding codebook includes at least one of the following:

[0580] Randomly selecting a codeword in the first precoding codebook as a first precoding codeword;

[0581] Using a codeword indicated by the first indication information in the first precoding codebook as a first precoding codeword;

[0582] Based on the codeword selection scheme indicated by the first indication information, a first precoding codeword is selected from the first precoding codebook.

[0583] In some embodiments, the codeword selection scheme includes at least one of the following:

[0584] Selecting a codeword from a first precoding codebook according to the MCS information in the first part;

[0585] A codeword is selected from the first precoding codebook according to the MCS range corresponding to the MCS information in the first part and the mapping relationship in the second configuration information, where the mapping relationship includes a mapping relationship between each codeword in the first precoding codebook and the MCS range.

[0586] In some embodiments, the MCS information in the first part indicates an MCS; the receiving module 903 is specifically configured to receive the PUSCH sent by the first node based on the MCS with a reduced order.

[0587] In some embodiments, the order of MCS reduction is determined according to the first indication information; or, the order of MCS reduction is determined by the first node.

[0588] In some embodiments, the modulation order corresponding to the MCS before the order reduction is the same as the modulation order corresponding to the MCS after the order reduction, and the code rate corresponding to the MCS before the order reduction is different from the code rate corresponding to the MCS after the order reduction.

[0589] In some embodiments, the sending module 902 is specifically configured to send at least two physical downlink control channels (PDCCHs) to the first node;

[0590] The DCI carried by the first PDCCH of the at least two PDCCHs includes: PUSCH layer number information and / or MCS information, and the DCI carried by the second PDCCH of the at least two PDCCHs carries compressed uplink subband CSI.

[0591] In some embodiments, the DCI carried by the first PDCCH further includes at least one of the following:

[0592] Control resource set information of the second PDCCH;

[0593] Search space information of the second PDCCH.

[0594] In some embodiments, the sending module 902 is specifically used to send second indication information to the first node, where the second indication information is used to indicate a physical downlink shared channel PDSCH, and the PDSCH carries the compressed uplink subband CSI; the receiving module 801 is also used to receive the PDSCH based on the second indication information to obtain the compressed uplink subband CSI.

[0595] In some embodiments, the second indication information is capable of scheduling one PDSCH and one PUSCH simultaneously.

[0596] In some embodiments, the sending module 902 is specifically used to send a first type physical channel to the first node, where the first type physical channel carries compressed uplink subband CSI, and the first type physical channel does not carry other content except the compressed uplink subband CSI.

[0597] In some embodiments, the uplink subband CSI includes CSI of multiple subbands; the sending module 902 is further used to send first subband information to the first node, where the first subband information is used to indicate CSI of at least one subband in the recovered uplink subband CSI.

[0598] In some embodiments, the compressed uplink subband CSI is carried by a first-type media access control element (MACCE), and the first-type MACCE satisfies at least one of the following conditions:

[0599] The first type of field in the first type of MACCE is used to indicate the total number of subbands included in the carrier bandwidth;

[0600] The second type of field in the first type of MACCE is used to indicate the subband index;

[0601] The third type of field in the first type of MAC CE is used to indicate the CSI of the subband corresponding to the compressed uplink subband CSI.

[0602] In some embodiments, the number of subbands corresponding to the compressed uplink subband CSI is one or more, and the second type of field and the third type of field corresponding to the same subband are arranged adjacent to each other in the first type of MAC CE.

[0603] In some embodiments, the uplink subband CSI includes a correspondence between at least one subband and at least one TPMI; the sending module 902 is further configured to send second subband information to the first node, where the second subband information is configured to indicate the TPMI corresponding to at least one subband in the correspondence.

[0604] In some embodiments, the corresponding relationship satisfies at least one of the following:

[0605] The correspondence is a table of the correspondence between a subband and a TPMI. Each row in the table corresponds to the correspondence between a subband and a TPMI.

[0606] The correspondence relationship is a set of correspondence relationships between a sub-band and a TPMI, and each element in the set corresponds to a correspondence relationship between a sub-band and a TPMI.

[0607] In some embodiments, a decoder of an artificial intelligence model is deployed in the first node, and an encoder of an artificial intelligence model is deployed in the second node. The decoder is used to decode the compressed uplink subband CSI to obtain the recovered uplink subband CSI, and the encoder is used to compress the original uplink subband CSI to obtain the compressed uplink subband CSI.

[0608] In some embodiments, the artificial intelligence model is trained based on a first type of SRS sent by the first node, and the maximum transmit power of the first type of SRS is indicated by third indication information sent by the second node;

[0609] The maximum transmission power of the first type of SRS is different from the maximum transmission power of the first node, and the maximum transmission power of the first type of SRS is not used for other channels or signals except the first type of SRS.

[0610] In some embodiments, the third indication information is used to indicate that a power value is used as the maximum transmit power of the first type of SRS; or, the third indication information is used to indicate that a sum of an offset value and the maximum transmit power of the first node is used as the maximum transmit power of the first type of SRS;

[0611] The unit of the power value is watt or decibel milliwatt dBm, and the offset value is a linear value or decibel value dB.

[0612] In some embodiments, the direct transmission power of the first type of SRS transmitted by the first node is indicated by fourth indication information sent by the second node;

[0613] The direct transmission power of the first type of SRS is not used for other channels or signals except the first type of SRS.

[0614] In some embodiments, the fourth indication information is used to indicate that a power value is used as the direct transmit power of the first type of SRS; or, the fourth indication information is used to indicate that the sum of an offset value and the transmit power of other types of SRS is used as the direct transmit power of the first type of SRS;

[0615] The unit of the power value is watt or decibel milliwatt dBm, and the offset value is a linear value or decibel value dB.

[0616] In some embodiments, the artificial intelligence model is trained based on the second type of SRS sent by the first node, and the frequency domain characteristics of the second type of SRS satisfy at least one of the following:

[0617] The subband size of the second type of SRS is one RB, and the subband size of the second type of SRS is irrelevant to the pre-configured subband size candidate set;

[0618] The subband position of the second type of SRS is any position in the carrier bandwidth, and the subband position of the second type of SRS is independent of a pre-configured or pre-determined subband position;

[0619] The second type of SRS occupies all resource elements RE in one RB;

[0620] The density of the second type of SRS is irrelevant to the preconfigured density candidate set, and the density of the second type of SRS is used to indicate the number of REs occupied in one RB.

[0621] In some embodiments, the artificial intelligence model is trained based on a third type of SRS sent by the first node, where the third type of SRS is transmitted through at least one port among all receive antenna ports of the first node.

[0622] In some embodiments, the sending module 902 is also used to send a first type of channel state information reference signal CSI-RS to the first node, so that the first node obtains downlink CSI based on the first type of CSI-RS, and the downlink CSI is used to perform performance monitoring on the first node side in combination with the recovered uplink subband CSI.

[0623] In some embodiments, the first type of CSI-RS is received via at least one transmit antenna port of the first node.

[0624] In some embodiments, the receiving module 903 is further configured to receive capability information sent by the first node, where the capability information is used to indicate whether the first node supports receiving a first type of CSI-RS based on at least one transmitting antenna port.

[0625] In some embodiments, the sending module 902 is further configured to send the original uplink subband CSI to the first node, where the original uplink subband CSI is used to perform performance monitoring on the first node side in combination with the restored uplink subband CSI.

[0626] In some embodiments, the receiving module 903 is further configured to receive the recovered uplink subband CSI sent by the first node;

[0627] The recovered uplink sub-band CSI is used in combination with the original uplink sub-band CSI to perform performance monitoring on the second node side.

[0628] In some embodiments, the sending module 902 is further used to send fifth indication information to the first node, where the fifth indication information is used to indicate the configuration of the first type of CSI report; the receiving module 903 is specifically used to receive the recovered uplink subband CSI sent by the first node according to the configuration of the first type of CSI report.

[0629] In some embodiments, the configuration of the first type CSI report includes: the first type CSI report is associated with one or more SRS resources, and the one or more SRS resources are associated with the original uplink subband CSI.

[0630] In some embodiments, the receiving module 903 is specifically configured to receive the recovered uplink subband CSI sent by the first node according to the reporting amount information in the configuration of the first type CSI report.

[0631] In some embodiments, the processing module 901 is further configured to monitor the performance of the first node side and / or the second node side by comparing the key performance indicator KPI of the communication method with the KPI of the first communication method;

[0632] The first communication method includes:

[0633] receiving a broadband TPMI sent by the second node, where the broadband TPMI is used to indicate the same TPMI corresponding to the entire bandwidth;

[0634] The transmit precoding matrix is determined based on the wideband TPMI.

[0635] In some embodiments, the first indication information is downlink control information DCI of format 0-1 or DCI of format 0-2. The optional field of the DCI is used to indicate the compressed uplink subband CSI. The optional field includes at least one of the following:

[0636] A field used to indicate SRS resource set indication information;

[0637] A field used to indicate second SRS resource set indication information;

[0638] A field used to indicate precoding information and the number of transmission layers;

[0639] A field used to indicate second precoding information.

[0640] In some embodiments, the conditions under which the optional field is used to indicate compressed uplink subband CSI include at least one of the following:

[0641] The sum of the bit length of the SRS resource set indication information and the bit length of the compressed uplink subband CSI in the field used to indicate the SRS resource set indication information is less than or equal to the maximum bit length of the field;

[0642] The sum of the bit length of the second SRS resource indication information and the bit length of the compressed uplink subband CSI in the field used to indicate the second SRS resource indication information is less than or equal to the maximum bit length of the field;

[0643] The sum of the bit length of the second precoding information in the field used to indicate the second precoding information and the bit length of the compressed uplink sub-band CSI is less than or equal to the maximum bit length of the field.

[0644] In some embodiments, the optional field is a field used to indicate precoding information and transmission layer number information, some bits in the optional field are used to indicate the transmission layer number information, and other bits are used to indicate compressed uplink subband CSI.

[0645] In the case of implementing the functions of the above-mentioned integrated modules in the form of hardware, the embodiment of the present disclosure provides another possible structural schematic diagram of the communication device involved in the above-mentioned embodiment. Figure 3 .like Figure 10 As shown, the communication device 1000 includes: a processor 1002 and a bus 1004. Optionally, the communication device may further include a memory 1001; and optionally, the communication device may further include a communication interface 1003.

[0646] Processor 1002 may implement or execute the various exemplary logic blocks, modules, and circuits described in conjunction with the embodiments of the present disclosure. Processor 1002 may be a central processing unit, a general-purpose processor, a digital signal processor, an application-specific integrated circuit, a field programmable gate array, or other programmable logic device, a transistor logic device, a hardware component, or any combination thereof. It may implement or execute the various exemplary logic blocks, modules, and circuits described in conjunction with the embodiments of the present disclosure. Processor 1002 may also be a combination that implements computing functions, such as a combination of one or more microprocessors, a combination of a digital signal processor (DSP) and a microprocessor, and the like.

[0647] The communication interface 1003 is used to connect to other devices via a communication network, such as Ethernet, wireless access network, or wireless local area network (WLAN).

[0648] The memory 1001 may be a read-only memory (ROM) or other type of static storage device that can store static information and instructions, a random access memory (RAM) or other type of dynamic storage device that can store information and instructions, or an electrically erasable programmable read-only memory (EEPROM), a disk storage medium or other magnetic storage device, or any other medium that can be used to carry or store desired program code in the form of instructions or data structures and can be accessed by a computer, but is not limited thereto.

[0649] As a possible implementation, the memory 1001 can exist independently of the processor 1002. The memory 1001 can be connected to the processor 1002 via a bus 1004 to store instructions or program codes. When the processor 1002 calls and executes the instructions or program codes stored in the memory 1001, the communication method provided in the embodiment of the present disclosure can be implemented.

[0650] In another possible implementation, the memory 1001 may also be integrated with the processor 1002 .

[0651] The bus 1004 may be an extended industry standard architecture (EISA) bus, etc. The bus 1004 may be divided into an address bus, a data bus, a control bus, etc. For ease of representation, Figure 10 Only one thick line is used in the diagram, but this does not mean that there is only one bus or one type of bus.

[0652] Some embodiments of the present disclosure provide a computer-readable storage medium (e.g., a non-transitory computer-readable storage medium), which stores computer program instructions. When the computer program instructions are executed on a computer, the computer executes the communication method described in any of the above embodiments.

[0653] Exemplarily, the computer-readable storage media may include, but are not limited to, magnetic storage devices (e.g., hard disks, floppy disks, or magnetic tapes), optical disks (e.g., compact disks (CDs), digital versatile disks (DVDs), etc.), smart cards, and flash memory devices (e.g., erasable programmable read-only memory (EPROM), cards, sticks, or key drives, etc.). The various computer-readable storage media described in the present disclosure may represent one or more devices and / or other machine-readable storage media for storing information. The term "machine-readable storage medium" may include, but is not limited to, wireless channels and various other media capable of storing, containing, and / or carrying instructions and / or data.

[0654] An embodiment of the present disclosure provides a computer program product comprising instructions. When the computer program product is run on a computer, the computer is enabled to execute the communication method described in any one of the above embodiments.

[0655] The above is only a specific embodiment of the present disclosure, but the scope of protection of the present disclosure is not limited thereto. Any changes or replacements within the technical scope disclosed in the present disclosure should be included in the scope of protection of the present disclosure. Therefore, the scope of protection of the present disclosure should be based on the scope of protection of the claims.

Claims

1. A communication method, characterized in that: Applied to the first node, the method includes: receiving compressed uplink subband channel state information CSI sent by the second node, where the compressed uplink subband CSI is obtained by compressing the original uplink subband CSI by the second node, and the uplink subband CSI is used to determine uplink precoding information of at least one subband; The compressed uplink sub-band CSI is restored to obtain the restored uplink sub-band CSI.

2. The method according to claim 1, characterized in that The uplink sub-band CSI includes at least one of the following: Time-frequency-spatial channel information of the uplink subband; Time-frequency-spatial domain precoding information of the uplink subband; The transmission precoding matrix indication information TPMI of the uplink subband.

3. The method according to claim 2, characterized in that The time-frequency-spatial channel information of the uplink subband includes at least one of time-domain information, frequency-domain information, and spatial-domain information; The time domain information includes: at least one of a symbol, a time slot, and a subframe; The frequency domain information includes: at least one of subband information and resource block RB information; The spatial domain information includes: at least one of information on the number of transmitting antenna ports, information on the number of uplink transmission layers, and amplitude and phase information of antenna ports.

4. The method according to claim 2, characterized in that The time-frequency-spatial domain channel information of the uplink subband and the time-frequency-spatial domain precoding information of the uplink subband are respectively indicated by at least one multidimensional matrix, and the multidimensional matrix satisfies the following characteristics: The first dimension of the multidimensional matrix corresponds to antenna port information; The second dimension of the multidimensional matrix corresponds to the number of transmission layers; The third dimension of the multidimensional matrix corresponds to frequency domain information; The fourth dimension of the multidimensional matrix corresponds to time domain information; Each element of the multi-dimensional matrix includes at least one of a product of amplitude and phase and a complex number.

5. The method according to claim 2, characterized in that The time-frequency-spatial domain channel information of the uplink subband and the time-frequency-spatial domain precoding information of the uplink subband are respectively indicated by a set of at least one multidimensional matrix, and each element in the set corresponds to the channel information of a time domain resource or the precoding information of a time domain resource; The channel information of one time domain resource or the precoding information of one time domain resource is respectively indicated by a multidimensional matrix, and the multidimensional matrix satisfies the following characteristics: The first dimension of the multidimensional matrix corresponds to antenna port information; The second dimension of the multidimensional matrix corresponds to the number of transmission layers; The third dimension of the multidimensional matrix corresponds to frequency domain information; Each element of the multi-dimensional matrix includes at least one of a product of amplitude and phase and a complex number.

6. The method according to claim 2, characterized in that The TPMI of the uplink subband is indicated by at least one multidimensional matrix, and the multidimensional matrix satisfies the following characteristics: The first dimension of the multidimensional matrix corresponds to subband information; The second dimension of the multidimensional matrix corresponds to time domain information; Each element of the multidimensional matrix corresponds to a TPMI.

7. The method according to claim 2, characterized in that The uplink subband CSI further includes: a singular vector of an uplink wireless channel matrix, wherein the singular vector includes a left singular vector or a right singular vector; The singular vectors of the uplink wireless channel matrix are indicated by at least one matrix, and each column of the matrix corresponds to a singular vector of the uplink wireless channel matrix; or The singular vectors of the uplink wireless channel matrix are indicated by a set of at least one vector, and each element in the set corresponds to a singular vector of the uplink wireless channel matrix.

8. The method according to claim 2, characterized in that The uplink subband CSI further includes: singular values of an uplink wireless channel matrix, wherein the singular values of the uplink wireless channel matrix are indicated by at least one matrix, and each element on the diagonal of the matrix corresponds to a singular value of the uplink wireless channel matrix.

9. The method according to claim 2, characterized in that The uplink subband CSI further includes: a weighted sum of multiple basis vectors for characterizing an uplink wireless channel matrix; The weighted sum of the multiple basis vectors is indicated by at least one matrix, the first dimension of the matrix corresponds to antenna port information, the second dimension of the matrix corresponds to transmission layer number information, the third dimension of the matrix corresponds to frequency domain information, and the fourth dimension of the matrix corresponds to time domain information.

10. The method according to claim 1, characterized in that The receiving compressed uplink subband channel state information CSI sent by the second node includes: Receive first indication information sent by the second node, where the first indication information is used to indicate the compressed uplink subband CSI.

11. The method according to claim 10, characterized in that The first field in the first indication information is used to indicate the compressed uplink subband CSI. The size of the first field is determined according to the data amount of the compressed uplink subband CSI, and the data amount of the compressed uplink subband CSI is determined according to the number of subbands corresponding to the uplink subband CSI.

12. The method according to claim 11, characterized in that The number of subbands corresponding to the compressed uplink subband CSI is determined according to the first configuration information sent by the second node; or, The number of subbands corresponding to the compressed uplink subband CSI is indicated by the second field in the first indication information; or, The number of subbands corresponding to the compressed uplink subband CSI is indicated by a frequency domain resource allocation field in the first indication information; the frequency domain resource allocation field is used to determine the number of RBs occupied by a physical uplink shared channel PUSCH.

13. The method according to claim 12, characterized in that The first configuration information includes at least one of the following: the number of subbands corresponding to the compressed uplink subband CSI; The size of the subband corresponding to the compressed uplink subband CSI; The size of the subband is different from the subband size of the sounding reference signal SRS.

14. The method according to claim 13, wherein: The first configuration information satisfies at least one of the following: At least one information element IE in the first configuration information is used to indicate the number or size of subbands corresponding to the compressed uplink subband CSI; The first configuration information includes at least one candidate set or list, each element in the candidate set or list corresponds to the number or size of subbands corresponding to the uplink subband CSI, wherein the first indication information indicates an element from the candidate set or list, indicating the number or size of subbands corresponding to the uplink subband CSI.

15. The method according to claim 10, characterized in that The first indication information includes a first part and a second part, the first part is used to indicate the total payload of the second part, and the second part is used to indicate the compressed uplink sub-band CSI.

16. The method according to claim 15, characterized in that The first part and the second part are channel coded independently of each other.

17. The method according to claim 16, characterized in that The method further comprises: In case of an error in decoding the second part, a PUSCH is transmitted based on the first part.

18. The method according to claim 17, characterized in that The PUSCH carries information about the second portion of decoding errors.

19. The method according to claim 17, wherein The first part includes at least one of the following: PUSCH layer number information; a first precoded codeword; Modulation and coding scheme MCS information.

20. The method according to claim 19, wherein The first precoding codeword is determined according to second configuration information sent by the second node.

21. The method according to claim 20, characterized in that The second configuration information includes at least one of the following: the first precoded codeword; A first precoding codebook; wherein the first precoding codeword is selected from the first precoding codebook.

22. The method according to claim 21, characterized in that The manner of selecting the first precoding codeword from the first precoding codebook includes at least one of the following: Randomly selecting a codeword from the first precoding codebook as the first precoding codeword; Using a codeword indicated by the first indication information in the first precoding codebook as the first precoding codeword; The first precoding codeword is selected from the first precoding codebook based on the codeword selection scheme indicated by the first indication information.

23. The method according to claim 22, characterized in that The codeword selection scheme includes at least one of the following: Selecting a codeword from the first precoding codebook according to the MCS information in the first part; A codeword is selected from the first precoding codebook according to the MCS range corresponding to the MCS information in the first part and the mapping relationship in the second configuration information, where the mapping relationship includes a mapping relationship between each codeword in the first precoding codebook and the MCS range.

24. The method according to claim 19, wherein The MCS information in the first part indicates an MCS; and sending the PUSCH based on the first part includes: The PUSCH is sent based on the MCS with a reduced order.

25. The method according to claim 24, characterized in that The order of the MCS reduction is determined according to the first indication information; or, The order of the MCS reduction is determined by the first node.

26. The method according to claim 24, characterized in that The modulation order corresponding to the MCS before the order is reduced is the same as the modulation order corresponding to the MCS after the order is reduced, and the code rate corresponding to the MCS before the order is reduced is different from the code rate corresponding to the MCS after the order is reduced.

27. The method according to claim 10, wherein The receiving the first indication information sent by the second node includes: receiving at least two physical downlink control channels (PDCCHs) sent by the second node; The DCI carried by the first PDCCH of the at least two PDCCHs includes: PUSCH layer number information and / or MCS information, and the DCI carried by the second PDCCH of the at least two PDCCHs carries the compressed uplink subband CSI.

28. The method according to claim 27, characterized in that The DCI carried by the first PDCCH further includes at least one of the following: Control resource set information of the second PDCCH; Search space information of the second PDCCH.

29. The method according to claim 1, wherein The receiving compressed uplink subband channel state information CSI sent by the second node includes: receiving second indication information sent by the second node, where the second indication information is used to indicate a physical downlink shared channel (PDSCH), where the PDSCH carries the compressed uplink subband CSI; Based on the second indication information, the PDSCH is received to obtain the compressed uplink subband CSI.

30. The method according to claim 29, wherein The second indication information is capable of scheduling one PDSCH and one PUSCH simultaneously.

31. The method according to claim 1, wherein The receiving compressed uplink subband channel state information CSI sent by the second node includes: A first type physical channel sent by the second node is received, where the first type physical channel carries the compressed uplink sub-band CSI and does not carry any other content except the compressed uplink sub-band CSI.

32. The method according to claim 1, wherein The uplink subband CSI includes CSI of multiple subbands; and the method further includes: Receive first subband information sent by the second node, where the first subband information is used to indicate CSI of at least one subband in the restored uplink subband CSI.

33. The method according to claim 1, wherein The compressed uplink sub-band CSI is carried by a first-type media access control element MACCE, where the first-type MACCE satisfies at least one of the following conditions: The first type of field in the first type of MACCE is used to indicate the total number of subbands included in the carrier bandwidth; The second type of field in the first type of MACCE is used to indicate the index of the subband; The third type of field in the first type of MAC CE is used to indicate the CSI of the subband corresponding to the compressed uplink subband CSI.

34. The method according to claim 33, wherein The number of subbands corresponding to the compressed uplink subband CSI is one or more, and the second type of fields and the third type of fields corresponding to the same subband are adjacently arranged in the first type of MACCE.

35. The method according to claim 1, wherein The uplink sub-band CSI includes a correspondence between at least one sub-band and at least one TPMI; the method further includes: Second subband information sent by the second node is received, where the second subband information is used to indicate a TPMI corresponding to at least one of the subbands in the corresponding relationship.

36. The method according to claim 35, characterized in that The corresponding relationship satisfies at least one of the following: The correspondence is a table of correspondence between a subband and a TPMI, where each row in the table corresponds to a correspondence between a subband and a TPMI; The correspondence relationship is a set of correspondence relationships between a sub-band and a TPMI, and each element in the set corresponds to a correspondence relationship between a sub-band and a TPMI.

37. The method according to claim 1, wherein A decoder of an artificial intelligence model is deployed in the first node, and an encoder of the artificial intelligence model is deployed in the second node. The decoder is used to decode the compressed uplink sub-band CSI to obtain the recovered uplink sub-band CSI, and the encoder is used to compress the original uplink sub-band CSI to obtain the compressed uplink sub-band CSI.

38. The method according to claim 37, wherein The artificial intelligence model is trained based on a first type of SRS sent by the first node, and the maximum transmit power of the first type of SRS is indicated by third indication information sent by the second node; The maximum transmission power of the first type of SRS is different from the maximum transmission power of the first node, and the maximum transmission power of the first type of SRS is not used for other channels or signals except the first type of SRS.

39. The method according to claim 38, characterized in that The third indication information is used to indicate that a power value is used as the maximum transmit power of the SRS of the first type; or, The third indication information is used to indicate that the sum of an offset value and the maximum transmit power of the first node is used as the maximum transmit power of the SRS of the first type; The unit of the power value is watt or decibel milliwatt dBm, and the offset value is a linear value or decibel value dB.

40. The method according to claim 38, wherein The direct transmission power of the first type of SRS transmitted by the first node is indicated by fourth indication information sent by the second node; The direct transmission power of the first type of SRS is not used for other channels or signals except the first type of SRS.

41. The method according to claim 40, wherein The fourth indication information is used to indicate that a power value is used as the direct transmission power of the first type of SRS; or, The fourth indication information is used to indicate that the sum of an offset value and the transmit power of other types of SRSs is used as the direct transmit power of the first type of SRS; The unit of the power value is watt or decibel milliwatt dBm, and the offset value is a linear value or decibel value dB.

42. The method according to claim 37, wherein The artificial intelligence model is trained based on a second type of SRS sent by the first node, where a frequency domain feature of the second type of SRS satisfies at least one of the following: A subband size of the second type of SRS is one RB, and the subband size of the second type of SRS is independent of a pre-configured subband size candidate set; The subband position of the second type of SRS is any position in the carrier bandwidth, and the subband position of the second type of SRS is independent of a pre-configured or pre-determined subband position; The second type of SRS occupies all resource elements RE in one RB; The density of the second type of SRS is irrelevant to a preconfigured density candidate set, and the density of the second type of SRS is used to indicate the number of REs occupied in one RB.

43. The method according to claim 42, characterized in that The artificial intelligence model is trained based on a third type of SRS sent by the first node, where the third type of SRS is transmitted through at least one port among all receiving antenna ports of the first node.

44. The method according to claim 1, wherein The method further comprises: receiving a first type of channel state information reference signal CSI-RS; A downlink CSI is acquired based on the first type of CSI-RS, where the downlink CSI is used to perform performance monitoring on the first node side in combination with the recovered uplink subband CSI.

45. The method according to claim 44, wherein The first type of CSI-RS is received through at least one transmitting antenna port of the first node.

46. The method according to claim 45, wherein The method further comprises: Send capability information to the second node, where the capability information is used to indicate whether the first node supports receiving the first type of CSI-RS based on the at least one transmit antenna port.

47. The method according to claim 1, wherein The method further comprises: The original uplink subband CSI sent by the second node is received, where the original uplink subband CSI is used to perform performance monitoring on the first node side in combination with the restored uplink subband CSI.

48. The method according to claim 1, wherein The method further comprises: sending the recovered uplink subband CSI to the second node; The recovered uplink sub-band CSI is used to perform performance monitoring on the second node side in combination with the original uplink sub-band CSI.

49. The method according to claim 48, characterized in that The sending the recovered uplink subband CSI to the second node includes: receiving fifth indication information sent by the second node, where the fifth indication information is used to indicate a configuration of a first type of CSI report; The recovered uplink subband CSI is sent to the second node according to the configuration of the first type CSI report.

50. The method according to claim 49, wherein The configuration of the first type of CSI report includes: the first type of CSI report is associated with one or more SRS resources, and the one or more SRS resources are associated with the original uplink subband CSI.

51. The method according to claim 50, characterized in that The sending the recovered uplink subband CSI to the second node according to the configuration of the first type CSI report includes: The recovered uplink subband CSI is sent to the second node according to the reporting amount information in the configuration of the first type CSI report.

52. The method according to claim 1, wherein The method further comprises: Performing performance monitoring on the first node side and / or the second node side by comparing a key performance indicator KPI of the communication method with a KPI of the first communication method; The first communication method includes: receiving a broadband TPMI sent by the second node, where the broadband TPMI is used to indicate a same TPMI corresponding to the entire bandwidth; A transmit precoding matrix is determined based on the wideband TPMI.

53. The method according to claim 11, wherein The first indication information is downlink control information DCI of format 0-1 or DCI of format 0-2, and an optional field of the DCI is used to indicate the compressed uplink subband CSI, and the optional field includes at least one of the following: A field used to indicate SRS resource set indication information; A field used to indicate second SRS resource indication information; A field used to indicate precoding information and the number of transmission layers; A field used to indicate second precoding information.

54. The method according to claim 53, wherein The condition under which the optional field is used to indicate the compressed uplink subband CSI includes at least one of the following: In a field for indicating SRS resource set indication information, the sum of the bit length of the SRS resource set indication information and the bit length of the compressed uplink subband CSI is less than or equal to the maximum bit length of the field; The sum of the bit length of the second SRS resource indication information and the bit length of the compressed uplink subband CSI in the field for indicating the second SRS resource indication information is less than or equal to the maximum bit length of the field; The sum of the bit length of the second precoding information in the field used to indicate the second precoding information and the bit length of the compressed uplink sub-band CSI is less than or equal to the maximum bit length of the field.

55. The method according to claim 53, wherein The optional field is a field used to indicate precoding information and transmission layer number information. Some bits in the optional field are used to indicate the transmission layer number information, and the other bits are used to indicate the compressed uplink sub-band CSI.

56. A communication method, characterized in that: Applied to the second node, the method includes: compressing the original uplink subband channel state information CSI to obtain the compressed uplink subband CSI, where the uplink subband CSI is used to determine uplink precoding information of at least one subband; The compressed uplink sub-band CSI is sent to the first node.

57. A communication device, characterized in that include: memory and processor; Memory and processor coupling; The memory is used to store instructions executable by the processor; When the processor executes the instructions, the method according to any one of claims 1 to 56 is performed.

58. A computer-readable storage medium, characterized in that The computer-readable storage medium stores computer instructions, which, when executed on a computer, enable the computer to perform the method according to any one of claims 1 to 56.

59. A computer program product, characterized in that The computer program product comprises computer program instructions which, when executed, implement the method according to any one of claims 1 to 56.

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