Communication method and apparatus for channel feedback

Abstract

The present application relates to the technical field of communications. Provided are a communication method and apparatus for channel feedback, which method and apparatus can improve the accuracy of a network device determining channel state information. The method comprises: receiving first indication information, wherein the first indication information is used for indicating a reference resource; and sending second indication information, wherein the second indication information is used for indicating P groups of channel association characteristics, P being a positive integer greater than 1. A p-th group of channel association characteristics is used for indicating the information difference between a p-th piece of channel information and reference channel information, where p=0, 1, ..., P-1; the p-th group of channel association characteristics is one of the P groups of channel association characteristics, and the p-th piece of channel information is one of P pieces of channel information; the P pieces of channel information are determined on the basis of Ks resources; and the Ks resources comprise the reference resource, and the reference channel information is channel information corresponding to the reference resource, Ks being a positive integer greater than 1.

Description

Communication methods and apparatus for channel feedback

[0001] This application claims priority to Chinese Patent Application No. 202411017615.5, filed on July 26, 2024, entitled "Communication Method and Apparatus for Channel Feedback", the entire contents of which are incorporated herein by reference. Technical Field

[0002] This application relates to the field of communication technology, and in particular to a communication method and apparatus for channel feedback. Background Technology

[0003] In hybrid beamforming (HBF) scenarios, network devices can select the directions of multiple analog beams and transmit pilot signals for channel estimation through different analog beams. For terminal devices, the process of network devices selecting analog beams is called beam training or beam scanning.

[0004] An exemplary beam scanning method involves a network device sending multiple reference signals (such as channel state information reference signals (CSI-RS)) to a terminal device via analog beams in different directions. The terminal device measures multiple reference signal resources (such as CSI-RS resources) and reports the corresponding channel state information (CSI). Based on the CSI reported by the terminal device, the analog beam with the highest performance suitability can be determined from the multiple analog beams. However, as more analog beams are selected, the terminal device needs to measure more pilot resources and incurs more feedback overhead, increasing the power consumption of the terminal device. Furthermore, the limited resources of the terminal device lead to a decrease in the accuracy of the CSI reported by the terminal device, thereby reducing the accuracy of the CSI determined by the network device.

[0005] Another exemplary beam scanning method involves a terminal device sending multiple reference signals (such as sounding reference signals, SRS) to a network device via analog beams from different directions. The network device measures these reference signal resources (such as SRS resources) to determine the CSI corresponding to each resource. This allows the analog beam with the highest performance fit to be selected from the multiple analog beams based on the CSI. However, uplink transmission power is typically low, resulting in a low signal-to-noise ratio for the signal received by the network device, thus reducing the accuracy of the CSI determined by the network device. Therefore, a new method is needed to improve the accuracy of the CSI determination by the network device. Summary of the Invention

[0006] This application provides a communication method and apparatus for channel feedback, which can improve the accuracy of network devices in determining channel state information.

[0007] In a first aspect, embodiments of this application provide a communication method for channel feedback. This method can be executed by a terminal device. Unless otherwise specified, "terminal device" in this application can refer to the terminal device itself, a component within the terminal device (e.g., a communication module, processor, circuit, chip, or chip system), or a logic module or software capable of implementing all or part of the terminal device's functions. The method includes: receiving first indication information, the first indication information indicating reference resources; and sending second indication information, the second indication information indicating P groups of channel association characteristics, where P is a positive integer greater than 1, and the p-th group of channel association characteristics indicating the information difference between the p-th channel information and the reference channel information, p = 0, 1, ..., P-1; wherein the p-th group of channel association characteristics is a set of channel association characteristics among the P groups of channel association characteristics, the p-th channel information is one of the P channel information, the P channel information is determined based on Ks resources, the Ks resources include reference resources, the reference channel information is the channel information corresponding to the reference resources, and Ks is a positive integer greater than 1.

[0008] Based on this scheme, the terminal device can determine and report the channel differences (i.e., P groups of channel association characteristics) between P channel information and the channel information corresponding to the reference resource (i.e., the reference channel information). Specifically, the terminal device reports these P groups of channel association characteristics through a second indication, enabling the network device to recover the P channel information based on these P groups of channel association characteristics and the reference channel information, where P is a positive integer greater than 1. Typically, the resources required to report the differences between the information are less than the resources required to report the information itself. Therefore, with the same resource size, compared to the scheme where the terminal device directly reports P channel information, this application can report more differences between information, thereby improving the accuracy of the network device in determining the P channel information.

[0009] In one possible design, the communication method for channel feedback further includes transmitting an uplink reference signal, which is used to determine reference channel information.

[0010] Based on this possible design, the terminal device can send an uplink reference signal to itself, allowing the network device to determine the reference channel information by measuring the uplink reference signal. It can be understood that, based on the reciprocity of uplink and downlink channels, the channel information determined by this uplink reference signal is the same as the channel information corresponding to the reference resource determined by the terminal device (i.e., the reference channel information). Therefore, the network device can measure the uplink reference signal corresponding to the network side receiving beam that is the same as the network side transmitting beam corresponding to the reference resource, thus determining the reference channel information. Compared to the terminal device, the network device has greater computing power, therefore the accuracy of the reference channel information it determines is higher, thereby improving the accuracy of the network device in determining P channel information.

[0011] In one possible design, the communication method for channel feedback further includes: sending third indication information, which is used to indicate reference channel information.

[0012] Based on this possible design, after determining the reference channel information, the terminal device can report it to the network device (i.e., indicate the reference channel information through third indication information); compared with the network device determining the reference channel information itself, this reduces the number of air interface interactions between the terminal device and the network device, saving resources.

[0013] In one possible design, before sending the second indication information, the communication method for channel feedback further includes receiving a fourth indication information, which indicates Ks resources.

[0014] In one possible design, the P channel information is determined based on Ks resources, including: the P channel information is determined based on M channel information, and the M channel information is determined based on Ks resources, where M is a positive integer greater than or equal to 1.

[0015] Based on the two possible designs mentioned above, the terminal device can determine Ks resources based on the Ks resources indicated by the network device, and then determine M channel information, thereby determining P channel information, thus providing a basic guarantee for the terminal device to determine P groups of channel association characteristics based on the P channel information.

[0016] In one possible design, before sending the second indication information, the communication method for channel feedback further includes: receiving a fifth indication information, the fifth indication information being used to indicate a first threshold, the first threshold being used to determine P channel information.

[0017] Based on this possible design, the terminal device can determine P channel information based on a first threshold. For example, the first threshold can be used as a conditional threshold for the P channel information; for instance, channel information that meets the conditions related to the first threshold can be determined as the P channel information. That is, the channel information that meets the conditions is filtered out by the first threshold, thereby improving the accuracy of the determined P groups of channel association characteristics.

[0018] Secondly, embodiments of this application provide a communication method for channel feedback. This method can be executed by a network device. Unless otherwise specified, "network device" in this application can refer to the network device itself, or a component in the network device (e.g., a communication module, processor, circuit, chip, or chip system), or a logic module or software that can implement all or part of the functions of the network device. The method includes: sending first indication information, which is used to indicate reference resources; receiving second indication information, which is used to indicate P groups of channel association characteristics, where P is a positive integer greater than 1; obtaining reference channel information, which is the channel information corresponding to the reference resources; determining P channel information based on the P groups of channel association characteristics and the reference channel information, where the p-th group of channel association characteristics is used to indicate the information difference between the p-th channel information and the reference channel information, p = 0, 1, ..., P-1; wherein, the p-th group of channel association characteristics is a group of channel association characteristics in the P groups of channel association characteristics, the p-th channel information is a channel information in the P channel information, the P channel information is associated with Ks resources, the Ks resources include the reference resources, and Ks is a positive integer greater than 1.

[0019] Based on this scheme, the terminal device can recover the P channel information corresponding to the P groups of channel association characteristics based on the channel differences (i.e., P groups of channel association characteristics) between the reported P channel information and the channel information corresponding to the reference resources (i.e., the reference channel information), and the reference channel information. Typically, the resources required for the differences between the reported information are less than the resources required for the reported information itself. Therefore, with the same resource size, compared to the scheme where the terminal device directly reports P channel information, this application can report more differences between information, thereby improving the accuracy of the network device in determining the P channel information.

[0020] In one possible design, obtaining reference channel information includes: receiving an uplink reference signal; and determining the reference channel information based on the uplink reference signal.

[0021] In one possible design, obtaining reference channel information includes: receiving third indication information, which is used to indicate the reference channel information.

[0022] In one possible design, before receiving the second indication information, the communication method for channel feedback further includes sending a fourth indication information, which indicates Ks resources.

[0023] In one possible design, P channel information is associated with Ks resources, including: the P channel information is part or all of the channel information in M ​​channel information, the M channel information is associated with Ks resources, and M is a positive integer greater than or equal to 1.

[0024] In one possible design, before receiving the second indication information, the communication method for channel feedback further includes: sending a fifth indication information, which indicates a first threshold, and the first threshold is used to determine P channel information.

[0025] In conjunction with the first or second aspect, in one possible design, the reference channel information is determined based on I sets of reference channel parameters. The i-th set of reference channel parameters in the I sets of reference channel parameters is used to indicate the channel information corresponding to the i-th antenna port in the reference port group. The reference port group is the port group corresponding to the reference resource. The reference port group includes I antenna ports. The I sets of reference channel parameters correspond to I antenna ports respectively. I is a positive integer greater than or equal to 1, and i = 0, 1, ..., I-1.

[0026] The p-th channel information is determined based on the p-th channel parameters in group I. The p-th channel parameters in group I are used to indicate the channel information corresponding to the i-th antenna port in the p-th port group. The p-th port group is the port group corresponding to the p-th resource in P resources. The p-th resource is one of the P resources. The P resources correspond to the P channel information respectively.

[0027] In conjunction with the first or second aspect, in one possible design, the p-th group of channel correlation characteristics is determined based on the I-th group of channel correlation parameters, where the i-th group of channel correlation parameters in the I-th group of channel correlation parameters is used to indicate the channel difference between the i-th group of reference channel parameters and the i-th group of p-th channel parameters.

[0028] Combining the first or second aspect, in one possible design, the i-th group of channel correlation parameters, the i-th group of reference channel parameters, and the i-th group of p-th channel parameters satisfy:

[0029] Where, d p,i Let h′ be the channel correlation parameter of the i-th group. #s,i Let h′ be the i-th set of reference channel parameters. #p,i Let (*) represent the p-th channel parameters of the i-th group. H This represents the conjugate transpose, i = 0, 1, ..., I-1, p = 0, 1, ..., P-1.

[0030] Based on the two possible designs mentioned above, the terminal device can determine the channel information (such as the i-th group of reference channel parameters and the i-th group of p-th channel parameters) corresponding to each antenna port (i-th antenna port) in each port group. This allows the terminal device to determine the difference between the channel information (i-th group of p-th channel parameters) corresponding to one antenna port in one of the P port groups and the channel information (i-th group of reference channel parameters) corresponding to one antenna port in the reference port group (i-th group of reference channel parameters), i.e., the i-th group of channel association parameters. This allows the terminal device to determine the channel association characteristics of each group, thereby improving the accuracy of the channel association characteristics reported by the terminal device and further improving the accuracy of the network device in determining the P channel information.

[0031] In conjunction with the first or second aspect, in one possible design, the i-th group of channel association parameters is determined based on N sub-reference channel parameters and N p-th sub-channel parameters; wherein the i-th group of reference channel parameters includes N sub-reference channel parameters, and the i-th group of p-th channel parameters includes N p-th sub-channel parameters, where N is a positive integer greater than 1.

[0032] Combining the first or second aspect, in one possible design, N is the number of frequency points corresponding to the frequency domain resources among the Ks resources.

[0033] In conjunction with the first or second aspect, in one possible design, the nth sub-reference channel parameter among the N sub-reference channel parameters is used to indicate the channel information corresponding to the nth frequency point among the N frequency points corresponding to the i-th antenna port in the reference port group, where the N frequency points correspond to the N sub-reference channel parameters respectively, n = 0, 1, ..., N-1; the nth p-th sub-channel parameter among the N p-th sub-channel parameters is used to indicate the channel information corresponding to the nth frequency point among the N frequency points corresponding to the i-th antenna port in the p-th port group, where the N frequency points correspond to the N p-th sub-channel parameters respectively.

[0034] Combining the first or second aspect, in one possible design, the N sub-reference channel parameters, the N p-th sub-channel parameters, and the i-th group of channel association parameters satisfy the following:

[0035] Where, d p,i Let h′ be the channel correlation parameter of the i-th group. #s,i (n) represents the parameters of the nth sub-reference channel, h′ #p,i (n) represents the nth sub-channel parameter at the pth position, where i = 0, 1, ..., I-1, p = 0, 1, ..., P-1, and n = 0, 1, ..., N. RB -1, N RB Let N = N_s, where N is the number of resource blocks (RBs) or subbands in the bandwidth to which K_s resources belong. RB ,(*)H This indicates the conjugate transpose.

[0036] Based on the above three possible designs, N can be the number of frequency points corresponding to the frequency domain resources in Ks resources. Thus, the terminal device can determine the channel information (i.e., N p-th sub-channel parameters) corresponding to the N frequency points under each antenna port, and determine the information difference (i.e., channel correlation characteristics) corresponding to each antenna port based on the N channel information. This improves the accuracy of the channel correlation characteristics and further improves the accuracy of the network device in determining the P channel information.

[0037] In conjunction with the first or second aspect, in one possible design, the nth sub-reference channel parameter among the N sub-reference channel parameters is used to indicate the nth time-domain channel information among the N time-domain channel information corresponding to the i-th antenna port in the reference port group. The N time-domain channel information corresponding to the i-th antenna port in the reference port group corresponds to the N sub-reference channel parameters respectively. The N frequency points corresponding to the frequency domain resources in the Ks resources correspond to the N time-domain channel information, n = 0, 1, ..., N-1.

[0038] The nth sub-channel parameter among the N pth sub-channel parameters is used to indicate the nth time-domain channel information among the N time-domain channel information corresponding to the i-th antenna port in the p-th port group. The N time-domain channel information corresponding to the i-th antenna port in the p-th port group corresponds to the N pth sub-channel parameters respectively.

[0039] Combining the first or second aspect, in one possible design, the N sub-reference channel parameters, the N p-th sub-channel parameters, and the i-th group of channel association parameters satisfy the following:

[0040] Where, d p,i Let h″ be the channel correlation parameter of the i-th group. #s,i (n) represents the nth sub-reference channel parameter, h″ #p,i (n) represents the nth sub-channel parameter at the pth position, where i = 0, 1, ..., I-1, p = 0, 1, ..., P-1, and n = 0, 1, ..., N. RB -1, N RB Let N = N_s be the number of RBs or subbands in the bandwidth belonging to the Ks resources. RB ,(*) H This indicates the conjugate transpose.

[0041] Based on the two possible designs mentioned above, N can be the number of frequency points corresponding to the frequency domain resources in the Ks resources. Thus, the terminal device can determine the time domain channel information (i.e., N p-th sub-channel parameters) corresponding to the N frequency points under each antenna port, and determine the information difference (i.e., channel correlation characteristics) corresponding to each antenna port based on the N channel information. This improves the accuracy of the channel correlation characteristics and further improves the accuracy of the network device in determining the P channel information.

[0042] In conjunction with the first or second aspect, in one possible design, the i-th group of channel association parameters is determined based on N sub-reference channel parameters and N p-th sub-channel parameters, including: the i-th group of channel association parameters is determined based on N groups of sub-channel association parameters, where the n-th group of sub-channel association parameters is used to indicate the information difference between the n-th sub-reference channel parameter and the n-th p-th sub-channel parameter, n = 0, 1, ..., N-1; wherein, the n-th sub-reference channel parameter is one of the N sub-reference channel parameters, and the n-th p-th sub-channel parameter is one of the p-th sub-channel parameters among the N p-th sub-channel parameters.

[0043] In conjunction with the first or second aspect, in one possible design, the nth sub-reference channel parameter is used to indicate the channel information corresponding to the i-th antenna port in the reference port group during the nth time period, and the nth p-th sub-channel parameter is used to indicate the channel information corresponding to the i-th antenna port in the p-th port group during the nth time period; wherein, the nth time period is one of the N time periods within the first time delay, the first time delay is the time delay corresponding to the time domain resource of any one of the Ks reference signal resources, and the time domain resource corresponding to each of the Ks reference signal resources has the same time delay.

[0044] Combining the first or second aspect, in one possible design, the nth sub-channel correlation parameters, the nth sub-reference channel parameters, and the nth p-th sub-channel parameters satisfy the following:

[0045] Among them, t n Let d represent the nth time period out of N time periods. p,i (n) represents the correlation parameters of the nth sub-channel, h″ #s,i (t) represents the sub-reference channel parameters corresponding to the nth time period out of the N time periods corresponding to the i-th antenna port in the reference port group, h″ #p,i (t) represents the sub-channel parameter corresponding to the nth time period in the N time periods corresponding to the i-th antenna port in the p-th port group, i = 0, 1, ..., I-1, p = 0, 1, ..., P-1, t = 0, 1, ..., N RB -1, N RBLet N = N_s be the number of RBs or subbands in the bandwidth belonging to the Ks resources. RB ,(*) H This indicates the conjugate transpose.

[0046] Based on the above three possible designs, N can be N time periods divided according to the time delay of any one of the Ks reference signal resources in the time domain. Thus, the terminal device can determine the channel information (i.e., N p-th sub-channel parameters) corresponding to the N time periods under each antenna port, and determine the information difference (i.e., channel correlation characteristics) corresponding to each antenna port based on the N channel information. This improves the accuracy of the channel correlation characteristics and further improves the accuracy of the network device in determining the P channel information.

[0047] In combination with the first or second aspect, in one possible design, N is the number of frequency domain resources (such as subcarriers) in the p-th resource (i.e., the resource corresponding to the p-th port group).

[0048] In conjunction with the first or second aspect, in one possible design, n p-th sub-channel parameters are used to indicate (or characterize / represent) the channel information in the frequency domain corresponding to the n-th frequency domain resource among the N frequency domain resources (i.e., the N frequency domain resources contained in the p-th resource) corresponding to the i-th antenna port in the p-th port group; the n-th sub-reference channel parameter is used to indicate (or characterize / represent) the channel information in the frequency domain corresponding to the n-th frequency domain resource among the N frequency domain resources (i.e., the N frequency domain resources contained in the reference resource) corresponding to the i-th antenna port in the reference port group.

[0049] Combining the first or second aspect, in one possible design, the nth sub-channel correlation parameters (i.e., the channel correlation characteristics corresponding to the nth frequency domain resource among the N frequency domain resources corresponding to the i-th antenna port in the p-th port group (i.e., the N frequency domain resources contained in the p-th resource), the nth p-th sub-channel parameter, and the nth sub-reference channel parameter satisfy the following:

[0050] Where, d p,i (n) represents the channel correlation characteristics of the nth frequency domain resource among the N frequency domain resources (i.e., the N frequency domain resources contained in the pth resource) of the nth sub-channel correlation parameters (i.e., the channel correlation characteristics of the nth frequency domain resource among the N frequency domain resources corresponding to the i-th antenna port in the p-th port group). #s,i (n) represents the parameters of the nth sub-reference channel, h′ #p,i(n) represents the parameter of the nth p-th subchannel, where n is any one of the N frequency domain resources (i.e., the nth frequency domain resource among the N frequency domain resources), i = 0, 1, ..., I-1, p = 0, 1, ..., P-1, n = 0, 1, ..., N-1, and N is the number of frequency domain resources (such as subcarriers) in the p-th resource (i.e., the resource corresponding to the p-th port group). (*) H This indicates the conjugate transpose.

[0051] In conjunction with the first or second aspect, in one possible design, the nth p-th sub-channel parameter is used to indicate (or characterize / represent) the time-domain channel information corresponding to the nth frequency domain resource among the N frequency domain resources (i.e., the N frequency domain resources contained in the p-th resource) corresponding to the i-th antenna port in the p-th port group; the nth sub-reference channel parameter is used to indicate (or characterize / represent) the time-domain channel information corresponding to the nth frequency domain resource among the N frequency domain resources (i.e., the N frequency domain resources contained in the reference resource) corresponding to the i-th antenna port in the reference port group.

[0052] Combining the first or second aspect, in one possible design, the nth sub-channel correlation parameters (i.e., the channel correlation characteristics corresponding to the nth frequency domain resource among the N frequency domain resources corresponding to the i-th antenna port in the p-th port group (i.e., the N frequency domain resources contained in the p-th resource), the nth p-th sub-channel parameter, and the nth sub-reference channel parameter satisfy the following:

[0053] Where, d′ p,i (n) represents the channel correlation characteristics of the nth frequency domain resource among the N frequency domain resources (i.e., the N frequency domain resources contained in the pth resource) of the nth sub-channel correlation parameters (i.e., the channel correlation characteristics of the nth frequency domain resource among the N frequency domain resources corresponding to the i-th antenna port in the p-th port group), h″ #s,i (n) represents the nth sub-reference channel parameter, h″ #p,i (n) represents the nth sub-channel parameter at the pth position, where n = 0, 1, ..., N RB -1, N RB Let N = N_s be the number of RBs or subbands in the bandwidth belonging to the Ks resources. RB , i=0,1,…,I-1, p=0,1,…,P-1, (*) H This indicates the conjugate transpose.

[0054] In conjunction with either the first or second aspect, in one possible design, the channel parameters corresponding to each antenna port are determined based on the channel state information (CSI) measurement results of the downlink reference signal received at that antenna port and the transformation matrix. The transformation matrix is ​​used for information conversion between the antenna domain and spatial domain information.

[0055] In conjunction with the first or second aspect, in one possible design, the transformation matrix is ​​determined based on the first matrix, which is determined based on the CSI measurement results corresponding to the antenna port.

[0056] In conjunction with either the first or second aspect, in one possible design, the transformation matrix is ​​composed of A column vectors of the first matrix. For example, the transformation matrix and the first matrix satisfy: F = V[:,0:A-1];

[0057] Where F is the transformation matrix, V is the first matrix, and V[:,0:A-1] represents the first A columns of matrix V.

[0058] Combining the first or second aspect, in one possible design, the channel information of the antenna domain corresponding to any one of the Ks resources in the first matrix satisfies:

[0059] Where, N RB Let f be the number of RBs or subbands in the bandwidth corresponding to Ks resources, and let f be N. RB One of the corresponding multiple subcarriers, H #1 (f) represents the channel information of the antenna domain corresponding to any given resource, V is the first matrix, (*) H Σ represents the conjugate transpose, and Σ is the eigenvalue corresponding to V.

[0060] In conjunction with either the first or second aspect, in one possible design, the transformation matrix consists of A / 2 column vectors of the first matrix. For example, the transformation matrix and the first matrix satisfy:

[0061] Where F is the transformation matrix, V′ is the first matrix, and V′[:,0:A / 2-1] represents the first A / 2 columns of matrix V′.

[0062] Combining the first or second aspect, in one possible design, the channel information of the antenna domain corresponding to any one of the Ks resources in the first matrix satisfies:

[0063] Where, N RB Let f be the number of RBs or subbands in the bandwidth corresponding to Ks resources, and let f be N. RB One of the corresponding multiple subcarriers, H #1 (f) represents the channel information of the antenna domain corresponding to any given resource, H #1 (f)[:,0:A / 2-1] represents matrix H #1 (f) The first A / 2 columns, H #1 (f)[:,A / 2-1:A-1] represents matrix H #1In (f), columns A / 2-1 to A-1, V′ is the first matrix, (*) H Σ represents the conjugate transpose, and Σ is the eigenvalue corresponding to V′.

[0064] In conjunction with the first or second aspect, in one possible design, the nth sub-channel parameter in the pth channel information satisfies a first condition, which is related to a first threshold; wherein the first condition satisfies one or more of the following:

[0065] The difference between the first received power and the second received power is less than or equal to a first threshold. The first received power is the received power corresponding to the nth sub-channel parameter in the pth channel information, and the second received power is the received power corresponding to the maximum sub-channel parameter of the i-th antenna port in the p-th port group; or...

[0066] The ratio between the nth sub-channel parameter and the maximum sub-channel parameter corresponding to the i-th antenna port in the p-th port group is less than or equal to the first threshold; or...

[0067] The difference between the first received power and the third received power is less than or equal to the first threshold, and the third received power is the received power corresponding to the maximum sub-channel parameter of the i-th antenna port in the reference port group; or...

[0068] The difference between the first received power and the fourth received power is less than or equal to the first threshold. The fourth received power is the received power corresponding to the largest sub-channel parameter among the (P+1)*I antenna ports in the P+1 port group. The P+1 port group includes the port groups corresponding to P resources and the reference port group; or...

[0069] The ratio between the nth sub-channel parameter and the largest sub-channel parameter among the (P+1) sub-channel parameters is less than or equal to the first threshold.

[0070] Combining the first or second aspect, in one possible design, Ks resources reside within the same resource set.

[0071] In combination with the first or second aspect, in one possible design, the time-domain resources of the Ks resources are located in the same time unit; or, the time-domain resources of the Ks resources are located in adjacent time units; or, the interval between the first and last time-domain resources of the Ks resources is less than or equal to T orthogonal frequency division multiplexing (OFDM) symbols, where T is a positive integer greater than or equal to 1.

[0072] Combining the first or second aspect, in one possible design, Ks resources have the same subcarrier spacing.

[0073] The technical effects of any design in the second aspect can be referenced from the technical effects of the corresponding design in the first aspect, and will not be elaborated here.

[0074] Thirdly, a communication device is provided for implementing various methods. This communication device can be a terminal device as described in the first aspect, or a network device as described in the second aspect, or a device included in the terminal device or network device, such as a chip or chip system. The communication device includes modules, units, or means corresponding to the implementation of the methods, which can be implemented in hardware, software, or by hardware executing corresponding software. The hardware or software includes one or more modules or units corresponding to the functions.

[0075] In some possible designs, the communication device may include a processing module and a transceiver module. The processing module can be used to implement the processing functions in any of the above aspects and any possible implementations thereof. The transceiver module may include a receiving module and a transmitting module, respectively used to implement the receiving function and the transmitting function in any of the above aspects and any possible implementations thereof.

[0076] In some possible designs, the transceiver module can consist of transceiver circuits, transceivers, transceivers, or communication interfaces.

[0077] Fourthly, a communication device is provided, comprising: a processor and a memory; the memory is used to store computer instructions, which, when executed by the processor, cause the communication device to perform the method described in any of the aspects. The communication device may be a terminal device as described in the first aspect, or a network device as described in the second aspect, or a device included in a terminal device or network device, such as a chip or chip system. The communication device includes modules, units, or means corresponding to the implementation of the method, which may be implemented in hardware, software, or by hardware executing corresponding software. The hardware or software includes one or more modules or units corresponding to the functions.

[0078] Fifthly, a communication device is provided, comprising: a processor and a communication interface; the communication interface being used to communicate with a module outside the communication device; the processor being used to execute computer programs or instructions to cause the communication device to perform the method described in any of the aspects. The communication device may be a terminal device as described in the first aspect, or a network device as described in the second aspect, or a device included in a terminal device or network device, such as a chip or chip system. The communication device includes modules, units, or means corresponding to the implementation of the method, which may be implemented in hardware, software, or by hardware executing corresponding software. The hardware or software includes one or more modules or units corresponding to the functions.

[0079] A sixth aspect provides a communication device, comprising: at least one processor; the processor being configured to execute a computer program or instructions to cause the communication device to perform the method described in any aspect. The communication device may be a terminal device as described in the first aspect, or a network device as described in the second aspect, or a device included in a terminal device or network device, such as a chip or chip system. The communication device includes modules, units, or means corresponding to the implementation of the method, which may be implemented in hardware, software, or by hardware executing corresponding software. The hardware or software includes one or more modules or units corresponding to the function.

[0080] In some possible designs, the communication device includes a memory for storing necessary programs, instructions, and / or data. This memory may be coupled to the processor, or it may be independent of the processor.

[0081] In some possible designs, when the device is a chip system, it can be composed of chips or contain chips and other discrete components.

[0082] It is understandable that when the communication device provided by any of the third to sixth aspects is a chip, the sending action / function of the communication device can be understood as outputting information, and the receiving action / function of the communication device can be understood as inputting information.

[0083] The aforementioned communication device may be a terminal device, or a communication module in a terminal device, or a chip in a terminal device that is responsible for communication functions, such as a modem chip (also known as a baseband chip), or a system-on-chip (SoC) chip or a system-in-a-package (SIP) chip that includes a modem module.

[0084] And / or, the aforementioned communication device may be a network device, or a communication module in a network device, or a circuit or chip in a network device responsible for communication functions, or a functional module in a network device capable of calling and executing programs.

[0085] In a seventh aspect, a computer-readable storage medium is provided that stores a computer program or instructions that, when executed on a communication device, enable the communication device to perform the method described in any aspect.

[0086] In an eighth aspect, a computer program product containing instructions is provided, which, when run on a communication device, enables the communication device to perform the method described in either aspect.

[0087] In a ninth aspect, a communication system is provided, comprising a terminal device (or a device included in the terminal device, such as a chip or chip system) as described in the first aspect and a network device (or a device included in the network device, such as a chip or chip system) as described in the second aspect.

[0088] The technical effects of any of the design methods in aspects three through nine can be found in the technical effects of different design methods in aspects one or two above, and will not be repeated here. Attached Figure Description

[0089] Figure 1 is a schematic diagram of an architecture of a wireless communication system applicable to embodiments of this application;

[0090] Figure 2 is a schematic diagram of another architecture of the wireless communication system applicable to the embodiments of this application;

[0091] Figure 3 is a schematic diagram of another architecture of the wireless communication system applicable to the embodiments of this application;

[0092] Figure 4 is a schematic diagram of the communication network element structure between an access network device and a terminal device provided in this application;

[0093] Figure 5 is a schematic diagram of a hybrid beamforming method provided in this application;

[0094] Figure 6 is a schematic diagram of the working principle of a beamforming method provided in this application;

[0095] Figure 7 is a schematic diagram of another architecture of the wireless communication system applicable to the embodiments of this application;

[0096] Figure 8 is a flowchart illustrating an information feedback method provided in this application;

[0097] Figure 9 is a flowchart illustrating another information feedback method provided in this application;

[0098] Figure 10 is a flowchart illustrating a communication method for channel feedback provided in this application;

[0099] Figure 11 is a flowchart illustrating another communication method for channel feedback provided in this application;

[0100] Figure 12 is a flowchart illustrating another communication method for channel feedback provided in this application;

[0101] Figure 13 is a flowchart illustrating another communication method for channel feedback provided in this application;

[0102] Figure 14 is a schematic diagram of the structure of a communication device provided in this application;

[0103] Figure 15 is a schematic diagram of another communication device provided in this application;

[0104] Figure 16 is a schematic diagram of another communication device provided in this application. Detailed Implementation

[0105] In the description of this application, unless otherwise stated, " / " indicates that the objects before and after are in an "or" relationship. For example, A / B can mean A or B. "And / or" in this application is merely a description of the relationship between the related objects, indicating that there can be three relationships. For example, A and / or B can mean: A exists alone, A and B exist simultaneously, and B exists alone. A and B can be singular or plural.

[0106] In the description of this application, unless otherwise stated, "multiple" means two or more. "At least one of the following" or similar expressions refer to any combination of these items, including any combination of a single item or a plurality of items. For example, at least one of a, b, or c can mean: a, b, c, ab, ac, bc, or abc, where a, b, and c can be single or multiple.

[0107] Furthermore, to facilitate a clear description of the technical solutions in the embodiments of this application, the terms "first" and "second" are used in the embodiments of this application to distinguish identical or similar items with substantially the same function and effect. Those skilled in the art will understand that the terms "first" and "second" do not limit the quantity or execution order, and the terms "first" and "second" are not necessarily different.

[0108] In the embodiments of this application, the terms "exemplary" or "for example" are used to indicate that something is an example, illustration, or description. Any embodiment or design that is described as "exemplary" or "for example" in the embodiments of this application should not be construed as being more preferred or advantageous than other embodiments or design. Specifically, the use of terms such as "exemplary" or "for example" is intended to present the relevant concepts in a specific manner to facilitate understanding.

[0109] It is understood that the term "embodiment" used throughout the specification means that a specific feature, structure, or characteristic related to an embodiment is included in at least one embodiment of this application. Therefore, various embodiments throughout the specification do not necessarily refer to the same embodiment. Furthermore, these specific features, structures, or characteristics can be combined in any suitable manner in one or more embodiments. It is understood that in the various embodiments of this application, the sequence number of each process does not imply the order of execution; the execution order of each process should be determined by its function and internal logic, and should not constitute any limitation on the implementation process of the embodiments of this application.

[0110] It is understood that the terms “comprising” and “having”, and any variations thereof, are intended to cover non-exclusive inclusion, such that a process, method, system, product, or apparatus that includes a series of steps or units is not necessarily limited to those steps or units that are explicitly listed, but may include other steps or units that are not explicitly listed or that are inherent to such process, method, product, or apparatus.

[0111] It is understood that in this application, "...when" and "if" both refer to the corresponding processing that will be carried out under certain objective circumstances, and are not limited to a specific time, nor do they require a judgment action to be performed during implementation, nor do they imply any other limitations.

[0112] It is understood that some optional features in the embodiments of this application can be implemented independently in certain scenarios without relying on other features, such as the current solution on which they are based, to solve the corresponding technical problems and achieve the corresponding effects. Alternatively, they can be combined with other features as needed in certain scenarios. Correspondingly, the apparatus given in the embodiments of this application can also implement these features or functions, which will not be elaborated here.

[0113] It is understood that in this application, "instruction" can include direct and indirect instructions, as well as explicit and implicit instructions. When describing "a certain instruction information instructs A" or "instruction information of A," it can include whether the instruction information directly or indirectly instructs A, but does not necessarily mean that the instruction information carries A. The information indicated by a certain piece of information is called the information to be instructed. In the specific implementation process, there are many ways to instruct the information to be instructed, such as, but not limited to, directly instructing the information to be instructed, such as the information to be instructed itself or its index. It can also indirectly instruct the information to be instructed by instructing other information, where there is a relationship between the other information and the information to be instructed. It can also instruct only a part of the information to be instructed, while the other parts are known or pre-agreed upon. For example, the instruction of specific information can be achieved by using a pre-agreed (e.g., protocol-defined) arrangement of various information, thereby reducing instruction overhead to some extent. At the same time, the common parts of various information can be identified and uniformly indicated to reduce the instruction overhead caused by individually indicating the same information. Furthermore, the specific instruction method can also be any existing instruction method, such as, but not limited to, the above-mentioned instruction methods and their various combinations. As described above, for example, when multiple pieces of information of the same type need to be indicated, the indication methods for different pieces of information may differ. In specific implementation, the required indication method can be selected according to specific needs. This application embodiment does not limit the selected indication method; therefore, the indication methods involved in this application embodiment should be understood to cover various methods that enable the party to be indicated to obtain the information to be indicated. The information to be indicated can be sent as a whole or divided into multiple sub-information pieces and sent separately. Furthermore, the sending period or timing of these sub-information pieces can be the same or different. This application does not limit the specific sending method. The sending period or timing of these sub-information pieces can be predefined, for example, predefined according to a protocol, or configured by the transmitting device by sending configuration information to the receiving device.

[0114] In this application, "send" and "receive" indicate the direction of signal transmission. For example, "send information to XX" can be understood as the destination of the information being XX, which can include direct transmission via the air interface or indirect transmission via the air interface from other units or modules. "Receive information from YY" can be understood as the source of the information being YY, which can include direct reception from YY via the air interface or indirect reception from YY via the air interface from other units or modules. "Send" can also be understood as the "output" of a chip interface, and "receive" can also be understood as the "input" of a chip interface. In other words, sending and receiving can occur between devices, such as between network devices and terminal devices, or within a device, such as between components, modules, chips, software modules, or hardware modules within the device via buses, traces, or interfaces.

[0115] In this application, unless otherwise specified, the same or similar parts between the various embodiments can be referred to each other. Unless otherwise specified or logically conflicting, the terminology and / or descriptions between different embodiments are consistent and can be mutually referenced. Different embodiments can be combined to form new embodiments based on their inherent logical relationships. The following descriptions of the embodiments of this application do not constitute a limitation on the scope of protection of this application.

[0116] The technical solutions provided in this application can be used in various communication systems, including cellular systems related to the 3rd Generation Partnership Project (3GPP), such as 4th generation (4G) long term evolution (LTE) systems, LTE-Advanced (LTE-A) systems, LTE frequency division duplex (FDD) systems, LTE time division duplex (TDD) systems, universal mobile telecommunication systems (UMTS), 5th generation (5G) new radio (NR) systems, vehicle-to-everything (V2X) systems, LTE and NR hybrid networking systems, or device-to-device (D2D) systems, machine-to-machine (M2M) communication systems, Internet of Things (IoT) systems, narrowband Internet of Things (NB-IoT) systems, and future communication systems.

[0117] Alternatively, the communication system may be a non-3GPP communication system, such as an open radio access network (O-RAN or ORAN), a cloud radio access network (CRAN), a wireless fidelity (WiFi) system, or a communication system that integrates multiple of the above communication systems. This application does not limit the scope of the application.

[0118] Figure 1 is a schematic diagram of the architecture of the communication system applied in the embodiments of this application. Figure 1 shows a schematic diagram of a possible, non-limiting system architecture. As shown in Figure 1, the communication system includes a radio access network (RAN) 100 and a core network (CN) 200. RAN 100 includes at least one RAN node (110a and 110b in Figure 1, collectively referred to as 110) and at least one terminal device (120a-120j in Figure 1, collectively referred to as 120). RAN 100 may also include other RAN nodes, such as wireless relay devices and / or wireless backhaul devices (not shown in Figure 1). Terminal device 120 is wirelessly connected to RAN node 110. RAN node 110 is wirelessly or wired connected to core network 200. The core network device in core network 200 and RAN node 110 in RAN 100 can be different physical devices, or they can be the same physical device integrating core network logical functions and radio access network logical functions.

[0119] RAN 100 can be a 3GPP-related cellular system, such as a 4G, 5G mobile communication system, or a future-oriented evolution system. RAN 100 can also be an open access network (O-RAN or ORAN), a cloud radio access network (CRAN), or a wireless fidelity (Wi-Fi) system. RAN 100 can also be a communication system that integrates two or more of the above systems.

[0120] RAN node 110, sometimes referred to as a network device, RAN entity, or access node, is part of the communication system used to help terminal devices achieve wireless access. Multiple RAN nodes 110 in the communication system can be of the same type or different types. In some scenarios, the roles of RAN node 110 and terminal device 120 are relative. For example, network element 120i in Figure 1 can be a helicopter or drone, which can be configured as a mobile base station. For terminal devices 120j accessing RAN 100 through network element 120i, network element 120i is a base station; but for base station 110a, network element 120i is a terminal device. RAN node 110 and terminal device 120 are sometimes both referred to as communication devices. For example, network elements 110a and 110b in Figure 1 can be understood as communication devices with base station functions, and network elements 120a-120j can be understood as communication devices with terminal functions.

[0121] Terminal equipment, also known as user equipment (UE), mobile station (MS), mobile terminal (MT), fixed wireless access (FWA), customer premises equipment (CPE), etc., refers to devices that include wireless communication capabilities (providing voice / data connectivity to users). Examples include handheld devices with wireless connectivity, in-vehicle devices, and machine-type communication (MTC) terminals. Currently, terminal devices can include: mobile phones, tablets, laptops, PDAs, mobile internet devices (MIDs), wearable devices, virtual reality (VR) devices, augmented reality (AR) devices, wireless terminals in industrial control, wireless terminals in self-driving (e.g., drones, vehicles), wireless terminals in remote medical surgery, wireless terminals in smart grids, wireless terminals in transportation safety, wireless terminals in smart cities, and wireless terminals in smart homes. For example, wireless terminals in self-driving can be drones, helicopters, or airplanes. For example, wireless terminals in vehicle-to-everything (V2X) can be in-vehicle equipment, vehicle-mounted equipment, in-vehicle modules, vehicles, or ships. Wireless terminals in industrial control can be cameras, robots, or robotic arms. Wireless terminals in smart homes can be televisions, air conditioners, robot vacuums, speakers, or set-top boxes. The terminal device can also be a device or module that is connected to the communication system shown above and has corresponding communication functions. The terminal device usually contains a communication module, circuit or chip that performs the corresponding communication function, and the terminal device is also configured with program instructions for performing the corresponding communication function.

[0122] It should be noted that the terminal device can be a device or apparatus with a chip, or a device or apparatus with integrated circuitry, or a chip, chip system, module, or control unit in the device or apparatus shown above; the specific application is not limited to any particular type. It should also be noted that in this application, when referring to a terminal device, it can refer to the terminal device itself, or to the chip, functional module, or integrated circuit within the terminal device that performs the method provided in this application; the specific application is not limited to any particular type.

[0123] A Radio Access Network (RAN) is a device deployed in a radio access network to provide wireless communication capabilities for terminal devices. RAN can also be referred to as a RAN entity, access node, network node, network device, or communication device, etc.

[0124] Specifically, RAN can be network equipment for 3GPP-related cellular systems, such as 4G mobile communication systems, 5G mobile communication systems, or future communication systems. RAN can also be network equipment in open access networks (O-RAN or ORAN) or cloud radio access networks (CRAN). Alternatively, RAN can also be network equipment in a communication system formed by the integration of two or more of the above communication systems.

[0125] RAN includes, but is not limited to: evolved Node B (eNB), radio network controller (RNC), Node B (NB), base station controller (BSC), base transceiver station (BTS), home base station (e.g., home evolved Node B, or home Node B, HNB), baseband unit (BBU), access point (AP) in wireless fidelity (Wi-Fi) systems, macro base station, micro base station, wireless relay node, donor node, radio controller in CRAN scenarios, wireless backhaul node, transmission point (TP), or transmission and reception point (or Transmit / Receive Point, TRP). RAN can also be network equipment in 5G mobile communication systems. For example, in NR systems, it can be a future communication network, a transmission and reception point (or Transmit / Receive Point, TRP), a TP, or one or more antenna panels (including multiple antenna panels) of a base station in a 5G mobile communication system. Alternatively, the RAN can also be a network node constituting a gNB or transmission point. Examples include a centralized unit (CU), a distributed unit (DU), a CU-control plane (CP), a CU-user plane (UP), or a radio unit (RU). CUs and DUs can be separate entities or included in the same network element, such as a BBU. RUs can be included in radio equipment or radio units, such as remote radio units (RRUs), active antenna units (AAUs), or remote radio heads (RRHs). Alternatively, the RAN can also be a server, wearable device, vehicle, or in-vehicle equipment. For example, in V2X technology, the RAN can be a roadside unit (RSU).

[0126] It should be noted that CU (or CU-CP and CU-UP), DU, or RU may have different names in different systems, but those skilled in the art will understand their meaning. For example, in an open radio access network (O-RAN or ORAN) system, CU can also be called an open centralized unit (O-CU) or an open CU, DU can also be called an open distributed unit (O-DU), centralized unit control plane (CU-CP) can also be called an open centralized unit control plane (O-CU-CP) or an open CU-CP, centralized unit user plane (CU-UP) can also be called an open centralized unit user plane (O-CU-UP) or an open CU-UP, and RU can also be called an open radio unit (O-RU). This application does not impose any specific limitations. Any of the units CU, CU-CP, CU-UP, DU, and RU in this application can be implemented through software modules, hardware modules, or a combination of software and hardware modules.

[0127] As shown in Figure 2(a), the ORAN system includes a core network, network equipment, and UEs. Optionally, the ORAN system may also include other components besides those shown in Figure 2(a), which is not limited in this application.

[0128] Network devices can communicate with the core network (CN) via a backhaul link (BH). Network devices can also communicate with the UE via the air interface. Specifically, the BBU in the network device communicates with the core network via the backhaul link. The RU in the network device communicates with at least one UE via the air interface. The BBU communicates with at least one RU via a fronthaul link; the BBU and RU may or may not be co-located. A BBU includes at least one CU and at least one DU, and the CU and DU can communicate with each other via at least one midhaul link.

[0129] In one possible implementation, as shown in Figure 2(b), the CU is a logical node carrying the radio resource control (RRC), service data adaptation protocol (SDAP) layer, packet data convergence protocol (PDCP) layer, and other control functions of the network device. The CU can connect to network nodes such as the core network through interfaces, such as the E2 interface. Optionally, the CU can have some core network functions. The CU (e.g., the PDCP layer and / or higher) connects to the DU (e.g., the radio link control (RLC) layer and lower layers of the DU) through interfaces, such as the F1 interface. Optionally, the F1 interface can provide control plane (C-Plane) and user plane (U-Plane) functions (e.g., interface management, system information management, UE context management, RRC message transmission, etc.). F1AP is the application protocol of the F1 interface, defining the signaling procedures of F1 in some examples. The F1 interface supports control plane F1-C and user plane F1-U.

[0130] Optionally, as shown in Figure 2(b), the CU can be split into CU-CP and CU-UP. CU-CP is a logical node carrying the control plane (PDCP-C) layer, which carries the RRC layer and the Packet Data Convergence Protocol layer, and is used to implement the CU's control plane functions. CU-CP can interact with network elements in the core network used to implement control plane functions. These network elements in the core network can be access and mobility function (AMF) network elements, such as the access and mobility management (AMF) function in a 5G system. The AMF network element is responsible for mobility management in the mobile network, such as terminal device location updates, terminal device registration with the network, and terminal device handover. CU-UP is a logical node carrying the user plane (PDCP-U) layer, which carries the SDAP layer and the Packet Data Convergence Protocol layer, and is used to implement the CU's user plane functions. CU-UP can interact with network elements in the core network used to implement user plane functions. In the core network, network elements used to implement user plane functions, such as the user plane function (UPF) in a 5G system, are responsible for forwarding and receiving data in terminal devices. The above configuration of CU and DU is merely an example; in practical applications, the functions of CU and DU can be configured as needed. For example, CU or DU can be configured to have more protocol layer functions, or to have only some protocol layer processing functions. For instance, some RLC layer functions and protocol layer functions above the RLC layer can be placed in the CU, while the remaining RLC layer functions and protocol layer functions below the RLC layer can be placed in the DU. Furthermore, the functions of CU or DU can be divided according to service type or other system requirements, such as by latency, placing functions that need to meet low latency requirements in the DU and functions that do not need to meet such latency requirements in the CU.

[0131] In one possible implementation, as shown in Figure 2(b), the DU is a logical node carrying the RLC layer, medium access control (MAC) layer, higher physical layer (Higher PHY) layer, and other functions. In some examples, the DU can control at least one RU. The DU connects to the RU through interfaces, which may be fronthaul interfaces. In some examples, the Higher PHY layer includes PHY layer processing functions such as forward error correction (FEC) encoding and decoding, scrambling, modulation, and demodulation.

[0132] In one possible implementation, as shown in Figure 2(b), the RU is a logical node carrying both lower physical layer (Lower PHY) and radio frequency (RF) processing. In some examples, the RU may be a 3GPP transmission and reception point (or Transmit / Receive Point, TRP), a remote radio head (RRH), or other similar entities. In some examples, the Lower-PHY includes PHY processing functions such as fast fourier transform (FFT), inverse fast fourier transform (IFFT), digital beamforming, and filtering. The RU communicates with one or more UEs via a radio link.

[0133] The DU and RU can be co-located or not. The DU and RU exchange control plane and user plane information via a fronthaul link through the Lower-Layer Split CUS-Plane (LLS-CUS) interface. LLS-CUS may include a Lower-Layer Split control (LLS-C) interface and a Lower-Layer Split user (LLS-U) interface, providing the control plane (C-Plane) and user plane (U-Plane) respectively. In some examples, the control plane (C-Plane) refers to real-time control between the DU and RU. The DU and RU exchange management information via a Lower-Layer Split management (LLS-M) interface on the fronthaul link; the management plane (M-Plane) refers to non-real-time management operations between the DU and RU. Furthermore, the LLS-M interface can also interact with the management system.

[0134] DU and RU can cooperate to implement the functions of the PHY layer. A DU can be connected to one or more RUs. The functions of DU and RU can be configured in various ways depending on the design. For example, a DU can be configured to implement baseband functions, and an RU can be configured to implement mid-RF functions. Another example is that a DU can be configured to implement higher-level functions in the PHY layer, and an RU can be configured to implement lower-level functions in the PHY layer, or to implement both lower-level and RF functions. Higher-level functions in the physical layer can include a portion of the physical layer's functions that are closer to the MAC layer, while lower-level functions in the physical layer can include another portion of the physical layer's functions that are closer to the mid-RF side.

[0135] In different systems, CU (or CU-CP and CU-UP), DU, or RU may have different names, but those skilled in the art will understand their meaning. For example, in an ORAN system, CU can also be called O-CU (open CU), DU can also be called O-DU, CU-CP can also be called O-CU-CP, CU-UP can also be called O-CU-UP, and RU can also be called O-RU. For ease of description, this application uses CU, CU-CP, CU-UP, DU, and RU as examples.

[0136] It should be noted that network devices can be devices or apparatuses with chips, or devices or apparatuses with integrated circuits, or chips, chip systems, modules, or control units in the devices or apparatuses shown above; this application does not impose any specific limitations. It should also be noted that in this application, the term "network device" can refer to the network device itself, or to chips, functional modules, or integrated circuits within the network device that implement the methods provided in this application; this application does not impose any specific limitations.

[0137] Referring to Figure 3, this is a schematic diagram of the communication network elements between the terminal device and the network device in an embodiment of this application. The terminal device 10 includes a processor 101, a memory 102, and a transceiver 103. The transceiver 103 includes a transmitter 1031, a receiver 1032, and an antenna 1033. The network device 20 includes a processor 201, a memory 202, and a transceiver 203. The transceiver 203 includes a transmitter 2031, a receiver 2032, and an antenna 2033. The receiver 1032 can be used to receive transmission control information through the antenna 1033, and the transmitter 1031 can be used to send transmission feedback information to the network device 20 through the antenna 1033. The transmitter 2031 can be used to send transmission control information to the terminal device 10 through the antenna 2033, and the receiver 2032 can be used to receive the transmission feedback information sent by the terminal device 10 through the antenna 2033. The memory 102 and memory 203 store computer program code.

[0138] To facilitate understanding of the technical solutions of the embodiments of this application, a brief introduction to the relevant technologies of this application is given below.

[0139] 1. Reference signal (RS):

[0140] Reference signals, also known as pilot signals, are essential in communication systems for transmitting and receiving data, obtaining system synchronization and feedback channel information, and estimating the uplink or downlink channel. Channel estimation refers to the process of reconstructing or recovering the received signal to compensate for signal distortion caused by channel fading and noise fading. It uses reference signals known to the transmitter and receiver to track the time and frequency domain changes of the channel. These reference signals are distributed across different resource elements (REs) in the time-frequency two-dimensional space within orthogonal frequency division multiplexing (OFDM) symbols, and have known amplitudes and phases.

[0141] At the physical layer, uplink communication can include the transmission of uplink physical channels and uplink signals (or, more specifically, uplink reference signals). Uplink physical channels include the random access channel (PRACH), the physical uplink control channel (PUCCH), and the physical uplink shared channel (PUSCH). Uplink signals include the sounding reference signal (SRS), the PUCCH de-modulation reference signal (PUCCH-DMRS), the PUSCH de-modulation reference signal (PUSCH-DMRS), the phase noise tracking reference signal (PTRS), and the uplink positioning signal (RS).

[0142] At the physical layer, downlink communication can include the transmission of downlink physical channels and downlink signals (or, also known as downlink reference signals). Downlink physical channels include the physical broadcast channel (PBCH), the physical downlink control channel (PDCCH), and the physical downlink shared channel (PDSCH). Downlink signals include the primary synchronization signal (PSS) / secondary synchronization signal (SSS), the downlink control channel demodulation reference signal (PDCCH-DMRS), the downlink data channel demodulation reference signal (PDSCH-DMRS), the phase noise tracking signal (PTRS), the channel status information reference signal (CSI-RS), the cell reference signal (CRS) (not present in NR), the time / frequency tracking reference signal (TRS) (not present in LTE), and the LTE / NR positioning signal (positioning RS), etc.

[0143] It should be understood that the reference signals listed above are merely examples and should not be construed as limiting this application. This application does not preclude the possibility of defining other reference signals in future agreements to achieve the same or similar functions.

[0144] In frequency division duplex (FDD) communication scenarios, because uplink and downlink channels lack reciprocity or cannot guarantee reciprocity, network devices typically send a Channel State Information (CSI-RS) message to the terminal devices. The terminal devices then perform channel estimation based on the received CSI-RS, such as estimating the downlink channel's channel state information (CSI) through channel measurements and interference measurements. The terminal devices then feed back the CSI to the network devices, which can then use this CSI to determine the allocation of downlink data channel resources, modulation and coding schemes (MCS), and precoding configurations for the terminal devices. CSI can be understood as a type of channel information, reflecting channel characteristics and quality. This channel information can also be referred to as channel response.

[0145] As an example, channel information includes at least one of the following: CSI, channel time-varying information, or channel frequency offset information. The following description primarily uses CSI as an example of channel information. It is understood that any information reflecting channel characteristics and channel quality is applicable to the embodiments of this application. Exemplarily, CSI can be represented by a channel matrix; for example, CSI includes a channel matrix, or CSI can be composed of eigenvectors of the channel.

[0146] Taking the method of obtaining downlink CSI through uplink feedback from terminal devices on the network side as an example, specifically, the network side sends downlink reference signals to the terminal devices, and the terminal devices receive the downlink reference signals. Since the terminal devices know the transmission information of the downlink reference signals, they can estimate (or measure) the downlink channel that the downlink reference signals have passed through based on the received downlink reference signals. Then, based on the measurement, the terminal devices can obtain the downlink channel matrix, generate CSI, and feed the CSI back to the network side.

[0147] For example, the CSI feedback from the terminal device to the network device may include: rank indicator (RI), reference signal received power (RSRQ) channel quality indicator (CQI), and precoding matrix indicator (PMI). RI indicates the number of downlink transmission layers suggested by the terminal device, CQI indicates the modulation and coding schemes supported by the current channel conditions as determined by the terminal device, and PMI indicates the precoding suggested by the terminal device. The number of precoding layers indicated by PMI corresponds to RI.

[0148] 2. Hybrid beamforming (HBF):

[0149] In higher frequency communication systems, base stations (and some terminals in certain frequency bands) typically use massive MIMO antenna arrays (e.g., 500–1000+ antenna elements) to compensate for path loss caused by higher frequency bands and improve coverage. From the perspective of base station implementation, even with large arrays, different frequency bands and array sizes utilize different array weighting methods (i.e., different beamforming methods).

[0150] The HBF architecture includes a number of digital ports (or digital channels). One analog beam corresponds to one or more digital ports (or a group of digital ports). Each digital port can be connected to multiple elements via a digital-to-analog converter (DAC). For example, an element includes an analog phase shifter and one or more antenna elements connected to that phase shifter. For instance, Figure 4 illustrates a configuration where one DAC corresponds to one digital port, one DAC corresponds to four elements, and each element includes an analog phase shifter and a dual-polarized antenna element connected to that phase shifter.

[0151] The ratio of digital ports to analog phase shifters in the HBF architecture can be configured according to different frequencies and system design requirements, and this application does not impose any limitations on this. For example, in high-frequency communication systems, the number of digital ports in the HBF is relatively small, while the number of analog phase shifters corresponding to a single digital port is relatively large. Typically, the number of digital ports in the HBF is configured to be 4–16, and the number of analog phase shifters corresponding to a single digital port can be 16–512. In low-frequency communication systems, the number of digital ports in the HBF is relatively large, while the number of analog phase shifters corresponding to a single digital port is relatively small. Typically, the number of digital ports in the HBF is configured to be 32–128, and the number of analog phase shifters corresponding to a single digital port can be 3–16. For example, the number of digital ports supported by existing protocols can be: 2, 4, 8, 12, 16, 24, 32, 48, 64, 96, and 128.

[0152] 3. Antenna ports and port groups:

[0153] An antenna port is a logical concept; there is no direct correspondence between an antenna port and a physical antenna. An antenna port is typically associated with a reference signal, and its meaning can be understood as a transmit / receive interface on the channel through which the reference signal passes. In low-frequency systems, an antenna port may correspond to one or more antenna elements that jointly transmit the reference signal; the receiver can treat them as a whole without distinguishing between individual elements. In high-frequency systems, an antenna port may correspond to a beam; similarly, the receiver only needs to treat this beam as an interface and does not need to distinguish between individual elements.

[0154] In this embodiment, the antenna port for transmitting the analog beam can be referred to as the analog antenna port, or simply as the antenna port or port. For ease of description, it will be uniformly referred to as the port in the following embodiments, and will not be elaborated further here.

[0155] The port group mentioned in the embodiments of this application can be multiple digital ports corresponding to the same analog beam, or a port group can be a set of multiple digital ports corresponding to multiple analog beams, or the digital ports corresponding to the same analog beam are divided into multiple subsets, each subset being a port group. This port group may also be called a digital-analog port group, etc.

[0156] 4. Beam:

[0157] A beam is a communication resource. Beams can be wide, narrow, or other types. The technology used to form beams is called beamforming. Beamforming refers to adjusting the amplitude and / or phase of a signal so that the radiated signal through an antenna array has a certain directionality, enabling higher antenna array gain. The main lobe of the antenna array's radiation pattern can be called the beam.

[0158] In beamforming technology, signals are filtered by a spatial domain transmission filter to achieve amplitude and / or phase adjustment. Different spatial domain transmission filters using different spatial filtering parameters can achieve beams in different directions. In the embodiments of this application, spatial filtering parameters can be replaced by beams, or spatial domain transmission filters can be replaced by spatial domain filtering parameters. Spatial domain transmission filters can also be called spatial domain filters, spatial filters, spatial domain parameters, spatial parameters, spatial domain settings, spatial settings, quasi-colocation (QCL) information, QCL assumptions, or QCL indications, etc. Beams can be represented by transmission configuration indicator parameters or by spatial relation parameters. Transmission configuration indicators can be in English as transmission configuration indicator state (TCI-state), transmission configuration indication state (TCI-state), or transmission configuration index state (TCI-state), etc.

[0159] Specifically, beamforming technology includes digital beamforming (DBF), analog beamforming (ABF), and hybrid digital-analog beamforming (HBF). DBF technology features multiple digital processing channels, each adjusting the phase (or amplitude and phase) of the signal in the digital domain to give the radiated signal directionality. Therefore, DBF technology can achieve the function of a spatial transmission filter through multiple digital processing channels. ABF technology transmits signals simultaneously using an antenna array composed of multiple antenna elements, with each element corresponding to a phase shifter. By adjusting the phase of the phase shifter corresponding to each antenna element, the radiated signal directionality is achieved. Therefore, ABF technology can achieve the function of a spatial transmission filter through multiple phase shifters corresponding to multiple elements in the antenna array. HBF technology is a combination of ABF and DBF technologies, incorporating both multiple digital processing channels and multiple analog phase shifters. Therefore, for hybrid beamforming technology, the function of the aforementioned spatial transmission filter can be achieved through multiple phase shifters corresponding to multiple array elements in the antenna array and multiple digital processing channels. However, this application is not limited to this; the aforementioned spatial transmission filter can also be implemented through other technologies.

[0160] It is understandable that one or more antenna ports that form a beam can be regarded as a set of antenna ports or a group of antenna ports. For ease of description, the following text will uniformly refer to a beam as being formed by one antenna port, and one or more digital ports that form a beam as a group of ports.

[0161] In one implementation, multiple digital channels are digitally weighted in the same way across the entire frequency band, which has an effect similar to analog beamforming.

[0162] In another implementation, the digital channels (or digital weighting) can be divided into multiple levels. The first level performs the same digital weighting across the entire frequency band, and the second level performs weighting for each sub-band. The effect is equivalent to hybrid beamforming. For ease of understanding, Figure 5 shows a schematic diagram of hybrid beamforming (or digital beamforming). One approach, as shown in Figure 5, involves uniformly dividing the digital channels into K1 groups (K1 being a positive integer) (or, K1 subarrays, K1 port groups). Each group (or subarray, port group) contains the same number of digital channels, for example, K2 (K2 being a positive integer). Digital beamforming and analog beamforming can be considered as two-stage beamforming. The first-stage beamforming is analog beamforming, and the weights for the first-stage beamforming (i.e., the first-stage weights) are W0 = [W 0,0 W 0,1 …W 0,K2-1The K2 elements correspond to K2 digital channels. The weights for the first-stage beamforming are broadband, and all groups use the same first-stage weight, W0. The second-stage beamforming is digital beamforming, and the weights for the second-stage beamforming (i.e., the second-stage weights) are W1 = [W 1,0 W 1,1 …W 0,K1-1 The K1 elements in this matrix correspond to K1 digital channels. The weights for the second-level beamforming are sub-band weights; the second-level weights differ between different groups (or subarrays, port groups), meaning the weight matrix corresponding to each digital channel is... or in, This represents the Kronecker product, as shown in Figure 5. This represents the weighting vector corresponding to the first-level weights. As can be seen, different weighting vectors result in different beam directions. Therefore, network devices can adjust the beam direction by adjusting the weighting vectors.

[0163] 4. Precoding and codebook:

[0164] In multiple-input multiple-output (MIMO) communication systems, the mathematical expression for communication is y = Hx + n, where y is the received signal, H is the MIMO channel, x is the transmitted signal, and n is noise. In communication systems with multiple antennas, signals from multiple transmit antennas can be superimposed on any one receive antenna. Therefore, the method of transmitting signals at the transmitter affects the system performance, and recovering the transmitted signal at the receiver is often complex. In this context, precoding is used to reduce system overhead and maximize the system capacity of MIMO, while also reducing the complexity of eliminating inter-channel interference at the receiver. In this case, the mathematical expression is y = HPx + n, where P is the precoding matrix (or vector). To simplify implementation complexity, P can be selected from a predefined set of matrices (or vectors), called the codebook. This method is also known as the codebook-based transmission method.

[0165] The codebook includes PMI indices and precoding matrices, with each PMI corresponding to a precoding matrix. The corresponding precoding matrix can be determined based on the PMIs fed back from the CSI. For the 3GPP "Release 15" protocol, in codebook-based feedback, the precoding matrix corresponding to one transport layer and one subband to be fed back can be represented as W: W = W1W2, where the dimension of W is P. CSI-RS ×N3, W1 is a wideband precoding matrix with dimension P. CSI-RS ×2L, W2 is the subband precoding matrix with dimensions 2L×N3. PCSI-RS N3 represents the number of CSI-RS ports, N3 represents the number of subbands or PMIs, and L represents the number of transmitted data streams. PMIs can specifically include feedback to precoding matrices for different transport layers and subbands.

[0166] When the number of CSI-RS ports is greater than 2, the number of precoding matrices, i.e. the number of weights, in the codebook will increase geometrically with the number of CSI-RS ports and layers. Therefore, the codebook is no longer suitable to be listed in the form of enumeration. Instead, it is generated according to certain rules based on the relevant parameter configuration. In other words, the codebook can be determined based on the relevant parameter configuration.

[0167] Specifically, the codebook can be determined in the following three steps: 1. Determine the spatial beam set, that is, the set of all values ​​in a codebook; 2. Select the broadband beam group, that is, determine the broadband precoding matrix W1; 3. Beam selection and phase quantization adjustment, that is, determine the sub-band precoding matrix W2.

[0168] For example, the spatial beam set can be determined by (N1, N2) and (O1, O2). Here, N1 represents the number of logical antenna ports in a certain direction of the same polarization, as shown in Figure 6(a), where N1 can refer to the horizontal direction; N2 represents the number of logical antenna ports in another direction of the same polarization, as shown in Figure 6(a), where N2 can refer to the vertical direction; O1 represents the oversampling factor of the Discrete Fourier Transform (DFT) in the direction of N1 (horizontal direction); and O2 represents the oversampling factor of the DFT in the direction of N2 (vertical direction).

[0169] With P CSI-RS Taking 16 as an example, for the same level of logical antenna ports, the possible combinations in the horizontal and vertical directions are only (4, 2) and (8, 1) as shown in the table above. When N1 is 4 and N2 is 2, it means that during beamforming, a total of N1×N2 weight vectors with a horizontal dimension of 4 and a vertical dimension of 2 can be formed. These weight vectors are orthogonal to each other, meaning that the beams formed by weighting these weight vectors do not interfere with each other.

[0170] The physical significance of O1 and O2 lies in the fact that DFT oversampling increases the number of weight vectors in the horizontal and vertical directions, thus generating more weight vectors. The values ​​of O1 and O2 also determine the beam density in the horizontal and vertical directions when the antenna configuration is fixed, i.e., when N1 and N2 are determined. The larger the values ​​of O1 and O2, the smaller the beam step size and the higher the accuracy during beam scanning. However, the trade-off is that the weight vectors are no longer orthogonal, meaning that there is interference between the beams formed after weighting these weight vectors.

[0171] Taking 16 CSI-RS ports as an example, as shown in Figure 6(b), (N1, N2) takes the value (4, 2), so the resulting spatial beam has a horizontal dimension of 4 and a vertical dimension of 2. (O1, O2) takes the value (4, 4), and each dot corresponds to a DFT oversampled weight vector. Since beams in different directions can be formed by weighting with different weight vectors, each dot in Figure 6(b) corresponds to a different DFT beam. Among them, the weight vectors corresponding to the black dots are orthogonal to each other, that is, the DFT beams corresponding to the black dots do not interfere with each other; while the weight vectors corresponding to the black dots and the shaded dots are no longer orthogonal, that is, there is some interference between the beams corresponding to the black dots and the DFT beams corresponding to the shaded dots.

[0172] As shown in Figure 6(b), the oversampled DFT beam index can be determined based on the position of each dot in the horizontal and vertical directions. l represents the DFT beam index in the horizontal direction, and m represents the DFT beam index in the vertical direction. For example, (l, m) = (0, 0) is used to indicate the DFT beam corresponding to the dot marked "1" in the spatial beam in Figure 6(b).

[0173] The broadband precoding matrix W1 is formed by oversampling the DFT matrix, that is, the DFT matrix is ​​oversampled in space to obtain the beamforming weights of the required precision. The weight vectors of the l-th and m-th beams corresponding to the horizontal and vertical directions satisfy the following expression:

[0174] Among them, v l Let l be the weight vector in the horizontal direction, and its length is N1. The number of weight vectors in the horizontal direction is determined by the number of values ​​that l can take; that is, l also represents the weights chosen in the horizontal direction.

[0175] u m Let m be the weight vector in the vertical direction, and its length is N². The number of vectors in the vertical direction is determined by the number of possible values ​​for m, meaning that m also represents the weights chosen in the vertical direction.

[0176] After confirming the weight sets in the horizontal and vertical directions, the selected weight set is determined. (This is achieved through v...) l and u m The Kronecker product represents only the weighting result for one set of polarized antennas. Typically, the other set of polarized antennas will have a certain phase deviation, determined by W2. Therefore, the final expression of W1 is v. l and u m The form of the second sub-block diagonal matrix in the Kronecker product.

[0177] The weight vector of the (l, m)th beam satisfies the following expression:

[0178] Among them, v l,m Let u be the weight vector of the (l, m)th beam. m Let m be the weight vector in the vertical direction, and its length is N². The specific number of vectors in the vertical direction is determined by the number of possible values ​​for m; that is, m also represents the weights chosen in the vertical direction. l Let l be the weight vector in the horizontal direction, and its length is N1. The number of weight vectors in the horizontal direction is determined by the number of values ​​that l can take. In other words, l also represents the weights selected in the horizontal direction.

[0179] 5. Reference signal resources:

[0180] Reference signal resources can be used to configure the transmission attributes of reference signals, such as time-frequency resource location, port mapping relationships, power factors, and scrambling codes. Transmitting devices can transmit reference signals based on reference signal resources, and receiving devices can receive reference signals based on reference signal resources.

[0181] To distinguish different reference signal resources, each reference signal resource can correspond to a reference signal resource identifier, such as CSI-RS resource indicator (CRI), synchronization signal block (SSB) resource indicator (SSBRI), and SRS resource indicator (SRI).

[0182] In the embodiments of this application, the terms "reference signal quality" and "reference signal resource quality" are sometimes used interchangeably, and those skilled in the art should understand their meaning. Reference signal resource quality can be understood as the quality of the reference signal received based on the reference signal resource, or the signal quality received and measured based on the reference signal resource.

[0183] Currently, utilizing more spectrum resources is a crucial means to enhance wireless channel capabilities, with the 6GHz band emerging as the next available spectrum resource for wireless communication. However, higher frequency bands result in greater signal energy transmission loss over the same transmission distance. To overcome this issue, network devices typically employ larger-scale antenna arrays to weight the transmitted signal, achieving higher array gain and thus increasing signal transmission energy. To reduce implementation costs, large-scale antenna arrays in network devices often adopt an HBF architecture, where a single digital channel drives multiple antenna elements through multiple phase shifters. Downlink signal transmission in network devices typically employs two levels of weighting: analog and digital domains. Therefore, the network device in Figure 3 can be replaced with the one shown in Figure 7. For details on the implementation of Figure 7, please refer to the relevant descriptions in Figures 3-5 above, which will not be repeated here.

[0184] In the HBF architecture, one analog beam corresponds to one or more reference signal resources (such as CSI-RS resources), and one reference signal resource is used to transmit one reference signal. The quality of the communication signal is better only when the analog beams are aligned with the communication target. The process of selecting an analog beam from multiple different analog beams is called beam scanning or beam training.

[0185] An exemplary beam scanning method is as follows: a network device sends multiple reference signals (i.e., downlink reference signals, such as CSI-RS) to a terminal device via analog beams in different directions. The terminal device measures multiple reference signal resources (such as CSI-RS resources) and reports the corresponding CSI values. Based on the CSI values ​​reported by the terminal device, the analog beam with the highest performance compatibility can be determined from the multiple analog beams. For example, as shown in Figure 8, the implementation process of the downlink reference signal may include the following steps S801 to S804:

[0186] S801. The network device sends a reference signal configuration to the terminal device, wherein the reference signal configuration includes channel information reporting (or measurement) configuration information.

[0187] Specifically, the channel information reporting configuration information can be sent from the network device to the terminal device via RRC signaling, and mainly includes two parts: resource configuration information (i.e., reference signal resource configuration) and reporting configuration information (i.e., reference signal reporting configuration).

[0188] The two most important parts of the CSI-RS configuration are "CSI-ReportConfig" and "CSI-ResourceConfig". It is understood that "CSI-ReportConfig" and "CSI-ResourceConfig" are names used for ease of description only, and other names may be used; this application does not impose any restrictions on this.

[0189] The "CSI-ReportConfig" configuration allows you to set parameters related to CSI reporting, such as "Report Configuration Id," "Report Configuration Type," and "Report Quantity." "ReportConfigId" identifies a "CSI-ReportConfig," meaning one "ReportConfigId" corresponds to one "CSI-ReportConfig." "ReportConfigType" configures the reporting type, which can be periodic, semi-continuous, or aperiodic. "ReportQuantity" configures the reported information, including CRI, PMI, RI, layer indicator (LI), CQI, reference signal receiving power (RSRP), RSRQ, signal-to-noise ratio (SNR), and signal-to-interference plus noise ratio (SINR). Different configurations allow you to report different information.

[0190] "CSI-ResourceConfig" can be used to configure information related to CSI-RS resources, such as the "CSI Resource Configuration Identifier (CSI-ResourceConfigId)" and the CSI-RS resources used for measurement. "CSI-ResourceConfigId" is the identifier for the "CSI Resource Configuration (CSI-ResourceConfig)," used to identify that "CSI-ResourceConfig," and this variable can be associated with "CSI-ReportConfig."

[0191] Resource configuration information refers to information related to measurement resources and can be configured through a three-level structure (resource configuration (resourceConfig) - resource set (resource) - resource (resource)). In other words, a network device can configure one or more resource configurations for a terminal device. Each resource configuration includes one or more resource sets, and each resource set can include one or more resources. Each resource configuration / resource set / resource includes its own index. Optionally, the channel information reporting configuration information may also include other parameters, such as the resource period and the signal type corresponding to the resource. For example, in a resource set, there can be a maximum of Ks = 8 resources.

[0192] In addition, the reporting configuration information refers to the information related to the reporting of measurement results, which is configured in the protocol through the reporting configuration (ReportConfig). Network devices can configure one or more reporting configurations (ReportConfig) for terminal devices. Each reporting configuration includes reporting metrics, reporting time and period, reporting format, and other reporting-related information. Furthermore, the reporting configuration also includes an index of resource configurations, indicating which measurement configuration was used to obtain the reported results.

[0193] S802. The network device sends one or more downlink reference signals. For example, the network device sends downlink signals (generally downlink reference signals) on the resources configured in the resource configuration information so that the terminal device can measure the downlink signals and determine the quality of each resource (i.e., the quality of the beam corresponding to the resource).

[0194] S803: The terminal equipment measures the downlink reference signal to obtain channel information. The downlink reference signal mainly includes SSB, CSI-RS, and tracking reference signal (TRS). The PBCH can carry the master information block (MIB), used to configure the cell's main system information.

[0195] S804. The terminal device sends channel information to the network device. For example, this channel information (i.e., CSI) may include a beam measurement report, which includes the CSI (i.e., the information reported above). For ease of description, the CSI determined by measuring the reference signal will be referred to as channel information in the following text, and will not be elaborated further.

[0196] Optionally, channel information can be carried in uplink control information (UCI) and transmitted via the physical uplink control channel (PUCCH) or the physical uplink shared channel (PUSCH).

[0197] In addition, after obtaining channel information in step S804, the network device can determine scheduling information, including one or more of the following: MCS, RB resource allocation, transmit beam, and receive beam, thereby improving the degree of beam matching with the channel and thus helping to improve communication rate and efficiency.

[0198] However, as more analog beams are selected, the terminal device needs to measure more pilot resources and incur more feedback overhead, which increases the power consumption of the terminal device. In addition, the limited resources of the terminal device lead to a decrease in the accuracy of the CSI reported by the terminal device, which in turn reduces the accuracy of the CSI determined by the network device.

[0199] Another exemplary beam scanning method is as follows: The terminal device sends multiple reference signals (i.e., downlink reference signals, such as SRS) to the network device through analog beams in different directions. The network device measures the multiple reference signal resources (such as SRS resources) to determine the CSI corresponding to each of the multiple reference signal resources. Thus, the analog beam with the highest performance adaptability can be determined from the multiple analog beams based on the CSI. For example, as shown in Figure 9, the implementation process of the downlink reference signal may include the following steps S901 to S903:

[0200] S901. The network device sends configuration information to the terminal device. For example, the configuration information may include configuration information of a reference signal, such as an SRS.

[0201] Specifically, the configuration information can be sent from the network device to the terminal device via RRC signaling. This configuration information mainly includes the resource configuration information of the reference signal (i.e., reference signal resource configuration). The reference signal resource configuration information is related to measurement resources and is configured in the protocol through a two-level structure (resource set - resource). The network device can configure one or more resource sets for the terminal device, and each resource set can include one or more resources. Each resource set / resource includes its own index. In addition, it includes other parameters such as the resource period and the signal type corresponding to the resource.

[0202] For example, taking the resource configuration information of the reference signal, including SRS resource configuration information, as an example, the SRS resource configuration information may include one or more of the following parameters: SRS resource set configuration information (SRS-ResourceSet), SRS resource set index (srs-ResourceSetId), SRS resource list (srs-ResourceIdList), SRS resource type (resourceType), etc. Among them, SRS resource type includes aperiodic SRS resources, semi-persistent SRS resources, periodic SRS resources, SRS resource set usage (such as beam management, codebook, non-codebook, antenna switching, etc.), SRS power control parameters, downlink reference signal for SRS path loss calculation (pathlossReferenceRS), SRS resource configuration (SRS-Resource), SRS resource index (srs-ResourceId), number of SRS resource ports (nrofSRS-Ports), and SRS resource frequency domain combing configuration (transm). The SRS resource mapping includes: issionComb, resourceMapping, startPosition, number of OFDM symbols for SRS resources (nrofSymbols), repetitionFactor, frequency domain position (freqDomainPosition), frequency domain shift (freqDomainShift), frequency hopping information (freqHopping), sequence index (sequenceId), and spatial relation information (spatialRelationInfo).

[0203] Specifically, when the SRS resource type is an aperiodic SRS resource, the SRS resource configuration information may also include one or more of the following parameters: aperiodic SRS-ResourceTrigger, CSI-RS index associated with the SRS resource set (csi-RS), and aperiodic SRS resource time offset position (slotOffset).

[0204] S902, The terminal sends one or more uplink reference signals.

[0205] S903: Network devices measure the uplink reference signal to obtain channel information. Subsequent data scheduling, precoding, and other functions can be performed based on this channel information.

[0206] However, uplink transmission power is typically low, resulting in a low signal-to-noise ratio for the signals received by network devices, which in turn reduces the accuracy of the CSI determined by the network devices.

[0207] In summary, both the implementation of CSI determination based on downlink reference signals and the implementation based on uplink reference signals lead to a decrease in the accuracy of the CSI determined by network devices. Therefore, a new method is needed to improve the accuracy of CSI determination by network devices.

[0208] In view of this, this application proposes that a terminal device can determine and report the channel differences (or, P groups of channel association characteristics) between P channel information and the channel information corresponding to reference resources (i.e., reference channel information). Specifically, the terminal device reports these P groups of channel association characteristics through a second indication, enabling the network device to recover the P channel information based on these P groups of channel association characteristics and the reference channel information, where P is a positive integer greater than 1. Typically, the resources required to report the differences between the information are less than the resources required to report the information itself. Therefore, with the same resource size, compared to the scheme where the terminal device directly reports P channel information, this application can report more differences between information, thereby improving the accuracy of the network device in determining the P channel information.

[0209] In this application, channel correlation characteristics refer to the correlation, correlation coefficient, cross-correlation coefficient, partial cross-correlation, partial correlation coefficient, or partial cross-correlation coefficient between two pieces of channel information (or two channel coefficients, or two CSI-RS ports, or a group of CSI-RS ports, or a CSI-RS transmission opportunity, or two CSI-RS resources, or a set of CSI-RS resources). The correlation characteristics can be normalized, normalized only for one piece of channel information, or used in other ways.

[0210] The method provided by the embodiments of this application will be described in detail below with reference to the accompanying drawings. The embodiments provided by this application can be applied to the communication system shown in FIG1 above, and are not limited thereto.

[0211] In the following embodiments, the interaction between a terminal device and a network device is used as an example for illustrative purposes. The terminal device can be replaced by a component of the terminal device (e.g., a chip, chip system, or circuit), and the network device can be replaced by a component of the network device (e.g., a chip, chip system, or circuit).

[0212] Referring to Figure 10, which is a schematic flowchart of a communication method for channel feedback provided in an embodiment of this application, the method shown in Figure 10 may include the following steps.

[0213] S1001, the network device sends first indication information to the terminal device; correspondingly, the terminal device receives the first indication information from the network device. The first indication information is used to indicate a reference resource. The reference resource is one of Ks resources, meaning that the Ks resources include the reference resource, and Ks is a positive integer greater than 1.

[0214] It should be understood that "resources" in this application refers to "reference signal resources," and therefore, reference resources can be understood as: reference signal resources used as a reference; or, they can also be understood as: reference signal resources used as a benchmark, and therefore, reference resources can also be called benchmark resources. Accordingly, Ks resources are Ks reference signal resources.

[0215] Optionally, the first indication information may include the index of the reference beam, and the reference resource is the resource corresponding to the reference beam.

[0216] For example, the network device can configure corresponding resources (i.e., Ks resources) for each of the Ks beams, that is, the Ks resources correspond to the Ks beams respectively; thus, the terminal device can determine the resource corresponding to the reference number (i.e., the reference resource) from the Ks resources according to the first indication information.

[0217] Specifically, the implementation of configuring corresponding resources for each of the Ks beams by the network device (i.e., configuring Ks resources by the network device) can be found in the relevant description of the following embodiments, and will not be repeated here.

[0218] For example, the reference resource may also be called a reference resource, a fixed resource, etc.; or it may have other names, such as the first resource; correspondingly, the reference beam may also be called a reference beam, a fixed beam, etc., or it may have other names, such as the first beam; the embodiments of this application are not limited.

[0219] It should be understood that, unless otherwise specified, the "correspondence" mentioned in the embodiments of this application refers to a one-to-one correspondence. For example, multiple parameters A and multiple parameters B correspond to each other, which means that multiple parameters A and multiple parameters B correspond one-to-one, that is, each parameter A corresponds to one parameter B. This will not be repeated here.

[0220] S1002, The terminal device sends second indication information to the network device; correspondingly, the network device receives the second indication information from the terminal device. The second indication information is used to indicate P groups of channel association characteristics, where P is a positive integer greater than 1, and the p-th group of channel association characteristics is used to indicate the information difference between the p-th channel information and the reference channel information, where p = 0, 1, ..., P-1.

[0221] Among them, the reference channel information is the channel information corresponding to the reference resource, the p-th group of channel association characteristics is a group of channel association characteristics in the P groups of channel association characteristics, the p-th channel information is a channel information in the P channel information, and the P channel information is determined based on the Ks resources.

[0222] For example, P groups of channel correlation characteristics can be understood as P sets containing channel correlation characteristics. Therefore, the p-th group of channel correlation characteristics can be understood as the p-th set among the P sets containing channel correlation characteristics.

[0223] For example, the p-th group of channel association characteristics is used to indicate the information difference between the p-th channel information and the reference channel information. It can also be understood as: the p-th group of channel association characteristics is used to represent the information difference between the p-th channel information and the reference channel information; or, it can also be understood as: the p-th group of channel association characteristics is used to characterize the information difference between the p-th channel information and the reference channel information.

[0224] For example, the determination of P channel information based on Ks resources can be understood as follows: P channel information is determined based on downlink reference signals (such as CSI-RS) carried on Ks resources. Alternatively, it can be understood as: P channel information is associated with Ks resources. For instance, the channel information corresponding to each resource can be obtained by measuring the downlink reference signals carried on K resources, i.e., Ks resources; and then P channel information can be determined based on Ks channel information.

[0225] For example, channel correlation characteristics may also be referred to by other names, such as channel difference, difference information, channel characteristics, etc.; similarly, reference channel information may also be referred to by other names, such as reference channel information, channel information of reference beam, channel information of reference beam, etc.; this application does not limit this.

[0226] Specifically, the implementation of the terminal device determining P channel information based on K channel information can be found in the relevant description of the following embodiments, and will not be repeated here.

[0227] S1003. The network device determines P channel information based on the P group channel association characteristics and reference channel information.

[0228] For example, based on the aforementioned step S1002, the p-th group of channel association characteristics in the P-group channel association characteristics is used to characterize the information difference between the p-th channel information and the reference channel information; therefore, the network device can recover the p-th channel information based on the p-th group of channel association characteristics and the reference channel information; thereby obtaining P channel information.

[0229] It should be understood that the communication method for channel feedback provided in this application can be implemented based on some or all of the steps S1001 to S1003 described above. For example, the communication method for channel feedback can be implemented based on steps S1001 to S1003 described above; or, if the terminal device has already obtained the reference resources before step S1001, the communication method for channel feedback can be implemented based on steps S1002 to S1003; if the network device has already obtained the P-group channel association characteristics before step S1003, the communication method for channel feedback can be implemented based on step S1003; or, in addition to steps S1001 to S1003 described above, the communication method for channel feedback can also be implemented based on more steps. In this case, the implementation of the communication method for channel feedback can be referred to the relevant description in Figure 11 or Figure 12 below, which will not be repeated here.

[0230] Optionally, the reference channel information can be determined by the network device itself through measurement, or it can be provided to the network device by the terminal device.

[0231] For example, when the reference channel information is determined by the network device itself through measurement, as shown in Figure 11(a), before step S1003, the communication method for channel feedback may further include steps S1004 to S1005:

[0232] S1004. The terminal device sends an uplink reference signal to the network device; correspondingly, the network device receives the uplink reference signal from the terminal device. The network-side received beam corresponding to the uplink reference signal is the same as the network-side transmitted beam corresponding to the reference resource.

[0233] For example, the network-side receiving beam corresponding to the uplink reference signal is the same as the network-side transmitting beam corresponding to the reference resource. This can be understood as the uplink reference signal and the downlink reference signal carried on the reference resource being transmitted on the same beam (i.e., the aforementioned reference beam). Based on the reciprocity of uplink and downlink channels, it can be known that the channel information determined by the network device based on the uplink reference signal is the same as the channel information corresponding to the reference resource determined by the terminal device, and both are reference channel information.

[0234] S1005. The network device determines the reference channel information based on the uplink reference signal.

[0235] For example, a network device can determine the channel information corresponding to the uplink reference signal by measuring the uplink reference signal; based on the reciprocity of uplink and downlink channels, this channel information is the reference channel information. Specifically, taking the uplink reference signal as the SRS as an example, the SRS sent by the terminal device and the SRS received by the network device can satisfy the following relationship (1): y #s =F #s HUL x SRS,s +n #s Relationship (1)

[0236] Among them, y #s This is the SRS received by the network device; the dimension of this SRS is P. TRX ×P SRS,s P TRX P represents the number of digital channels. SRS,s This refers to the number of transmit antenna ports for the terminal device. H UL It is an uplink channel with dimension P. BS,AE ×P SRS,s P BS,AE This refers to the number of antenna elements in the network device. F #s The weights corresponding to the receiving beam of the network device (e.g., the weight matrix of an analog beam, with dimension P). TRX ×P BS,AE For example, a hybrid analog-digital weight matrix with dimension P. Port ×P BS,AE , where P Port (Number of digital ports). x SRS,s It is an SRS sent by the terminal device, and its dimension is P. SRS,s ×1. n #s It is noise, and its dimension is P. SRS,s ×1. Since uplink and downlink channels are reciprocal, meaning the channel estimated by the network using the uplink reference signal can be used for the downlink channel, i.e. (H DL (It is the downlink channel), or, in(*) T This indicates transpose. Using SRS, network devices can estimate F. #s H UL .

[0237] It should be noted that this application does not limit the order of steps S1004-S1005 and steps S1001-S1002; steps S1004-S1005 may be performed before steps S1001-S1002, or steps S1004-S1005 may be performed after steps S1001-S1002, or steps S1004-S1005 and steps S1001-S1003 may be performed simultaneously.

[0238] Based on this scheme, the network device itself can determine the reference channel information by measuring the uplink reference signal. It can be understood that, based on the reciprocity of uplink and downlink channels, the channel information determined by the uplink reference signal is the same as the channel information corresponding to the reference resource determined by the terminal device (i.e., the reference channel information). Therefore, the network device can measure the uplink reference signal corresponding to the network-side received beam that is the same as the network-side transmitted beam corresponding to the reference resource to determine the reference channel information. Compared to the terminal device, the network device has greater computing power, therefore the accuracy of the reference channel information it determines is higher, thus improving the accuracy of the network device in determining P channel information.

[0239] For example, when a terminal device informs a network device of reference channel information, as shown in Figure 11(b), before step S1003, the communication method for channel feedback may further include step S1006:

[0240] S1006, The terminal device sends third indication information to the network device; correspondingly, the network device receives the third indication information from the terminal device. The third indication information is used to indicate reference channel information.

[0241] For example, a terminal device can obtain reference channel information by measuring the downlink reference signal on the reference resource. Specifically, taking the downlink reference signal as CSI-RS as an example, the CSI-RS sent by the network device and the CSI-RS received by the terminal device can satisfy the following relationship (2): y #k =H DL G #k x CSI-RS,k +n #k Relationship (2)

[0242] Among them, y #k It is the CSI-RS received by the terminal device, and its dimension is P. RX ×P CSI-RS,k P RX P represents the number of receiving channels of the terminal device. CSI-RS,k Indicates the number of CSI-RS ports. H DL It is a downlink channel with dimension P. RX ×P TRX P TRX G represents the number of digital channels in a network device. #k Send the weights corresponding to the beams to the network devices (e.g., weight matrices of analog and / or digital beams, with dimension P). BS,AE ×P CSI-RS,k ). x CSI-RS,k It is a CSI-RS sent by a network device, and its dimension is P. CSI-RS,k ×1). n #k It is noise, and its dimension is P.CSI-RS,k ×1. The base station estimates H using CSI-RS. DL G #k .

[0243] It should be noted that this application does not limit the order of steps S1006 and S1001 to S1002; step S1006 may be executed before steps S1001 to S1002, or step S1006 may be executed after steps S1001 to S1002, or step S1006 and steps S1001 to S1003 may be executed simultaneously.

[0244] Based on this scheme, after determining the reference channel information, the terminal device can report it to the network device; compared with the network device determining the reference channel information itself, this reduces the number of air interface interactions between the terminal device and the network device, saving resources.

[0245] Optionally, the method further includes: the terminal device transmitting capability information, which indicates support for transmitting the P-group channel association characteristics (or support for the methods of one or more embodiments of this application). Specifically, the terminal device may also transmit capability information indicating support for transmitting the P-group channel association characteristics, enabling the network device to schedule the terminal device to feed back lower-dimensional channel information based on the capability information. This allows the network device to obtain higher-dimensional precoding information, thereby reducing the overhead in the channel measurement process.

[0246] The communication method for channel feedback provided in this application allows a terminal device to determine and report the channel differences (or, also referred to as P groups of channel association characteristics) between P channels and the channel information corresponding to reference resources (i.e., reference channel information). Specifically, the terminal device reports these P groups of channel association characteristics through a second indication, enabling the network device to recover the P channels based on these characteristics and the reference channel information, where P is a positive integer greater than 1. Typically, the resources required to report the differences between the reported information are less than the resources required to report the information itself. Therefore, with the same resource size, compared to a scheme where the terminal device directly reports P channels, this application can report more differences between information, thereby improving the accuracy of the network device in determining the P channels.

[0247] The above is a general description of the embodiments provided in this application. The "P channel information" involved in the above embodiments will be described in detail below. Optionally, the P channel information is determined based on Ks resources, including: the P channel information is determined based on M channel information, where M channel information is determined based on Ks resources, and M is a positive integer greater than or equal to 1. That is, before step S1002, the communication method for channel feedback may further include: the terminal device determines M channel information based on Ks resources, then determines P channel information based on the M channel information, and thus determines P groups of channel association characteristics based on the P channel information and reference channel information.

[0248] The implementations of Ks resources, M channel information items, and P channel information items are described below:

[0249] (1) Implementation for Ks resources:

[0250] For example, Ks resources are configured by the network device for the terminal device. As shown in Figure 12, before step S1002, the communication method for channel feedback may further include the following step S1007:

[0251] S1007. The network device can send fourth indication information to the terminal device; correspondingly, the terminal device receives the fourth indication information from the network device. The fourth indication information is used to indicate Ks resources.

[0252] For example, the fourth indication information is used to indicate Ks resources, which can be understood as: the network device configures Ks resources for the terminal device through the fourth indication information; that is, the network device sends resource configuration information to the terminal device through the fourth indication information. Furthermore, the fourth indication information can also indicate reported configuration information (i.e., parameters included in the channel information). In this case, the fourth indication information can also be understood as channel information reporting configuration information. Specifically, the implementation of channel information reporting configuration information can be found in the relevant description in Figure 8 above, and will not be repeated here.

[0253] It should be noted that this application does not limit the order of steps S1001 and S1007; for example, step S1001 may be executed before step S1007, or step S1001 may be executed after step S1007, or step S1001 may be executed simultaneously with step S1007.

[0254] For example, Ks can be any value among 2, 3, 4, and 8; or, Ks can be any other value, as long as Ks is a positive integer greater than 1.

[0255] For example, as described above, Ks channel information corresponds to Ks resources, and Ks resources correspond to Ks beams; furthermore, each of the Ks beams corresponds to a port group. Each port group includes I antenna ports. Therefore, it can also be considered that each resource corresponds to a port group, a beam, and a channel information.

[0256] Optionally, the Ks resources can be located within the same resource set.

[0257] Optionally, the time-domain resources in the Ks resources are located in the same time unit; or, the time-domain resources in the Ks resources are located in adjacent time units; or, the interval between the first and last time-domain resources in the Ks resources is less than or equal to T OFDM symbols.

[0258] For example, a time unit can be a minislot, a time slot, a subframe, or a transmission time interval (TTI). Specifically, taking a time slot as an example, the time-domain resources in Ks resources can be located in the same time slot, or the time-domain resources in Ks resources can be located in adjacent time slots, or the interval between the first and last time-domain resources in Ks resources can be less than or equal to T OFDM symbols.

[0259] For example, the value of T can be preset, such as by being predefined through a protocol; or, as agreed upon in advance between the terminal device and the network device, such as the network device determining and informing the terminal device in advance, or the terminal device determining and informing the network device.

[0260] Optionally, Ks resources may have the same subcarrier spacing.

[0261] Optionally, the downlink reference signals transmitted on the Ks resources can be transmitted in a time-division manner, i.e., transmitted on different time-domain resources (i.e., time slots or OFDM symbols). Specifically, time-division transmission facilitates the measurement of channel information by transmitting multiple downlink reference signals based on different analog beams under the HBF architecture. Alternatively, time-division transmission can facilitate the joint acquisition of channel information for a larger number of ports (i.e., the entire port group) based on downlink reference signals transmitted multiple times (each time transmitted on a subset of ports in the port group corresponding to the resource).

[0262] Optionally, the downlink reference signals transmitted on the Ks resources can be transmitted on different frequency domain resources (i.e., component carriers, resource blocks, or different subcarriers). Specifically, frequency division transmission (i.e., transmission on different frequency domain resources) facilitates rapid scanning of channel information by the network side.

[0263] Optionally, the Ks resources can be aperiodic or semi-persistent.

[0264] In some possible implementations, the terminal device can determine the channel information (i.e., Ks channel information) corresponding to each resource based on the downlink reference signals on Ks resources.

[0265] For example, in this possible implementation, the implementation of channel information #1 is related to H in the above relationship (2). DL G #k The implementation is similar, and the specific details can be found in the relevant description of relationship (2) above, which will not be repeated here. Alternatively, based on the foregoing, Ks resources correspond to Ks beams respectively, and each beam corresponds to a port group, and each port group includes P CSI-RS There are Ks antenna ports; that is, Ks resources correspond to Ks port groups, and each of the Ks port groups includes the same number of antenna ports, which is P. CSI-RS There are Ks antenna ports. Therefore, the channel information corresponding to each of the Ks resources can be determined based on the channel parameters corresponding to each antenna port in the port group corresponding to that resource; that is, the channel information corresponding to each resource can be determined based on the P of that resource. CSI-RS The channel parameters corresponding to each antenna port are determined. In other words, the channel information for each resource includes the P corresponding to that resource. CSI-RS The channel parameters corresponding to each antenna port, or in other words, the channel information corresponding to each resource, are determined by the P corresponding to that resource. CSI-RS The channel parameters correspond to each antenna port. These channel parameters indicate the channel information corresponding to a single antenna port. In other words, the channel parameters characterize / represent the channel information corresponding to a single antenna port.

[0266] For example, in this possible implementation, the implementation of channel information #1 is related to H in the above relationship (2). DL G #k The implementation is similar, and the specific details can be found in the relevant description of relationship (2) above, which will not be repeated here. Alternatively, based on the foregoing, Ks resources correspond to Ks beams respectively, and each beam corresponds to a port group, and each port group includes P CSI-RSThere are Ks antenna ports, but the terminal only measures I antenna ports. That is, Ks resources correspond to Ks port groups, and each of these Ks port groups has the same number (and / or set) of antenna ports actually measured by the terminal, which is I antenna ports. Alternatively, the channel information corresponding to each resource includes the channel parameters corresponding to the I antenna ports corresponding to that resource, or the channel information corresponding to each resource is composed of the channel parameters corresponding to the I antenna ports corresponding to that resource. In one case, each antenna port corresponds one-to-one with each channel parameter, and each channel parameter indicates the channel information corresponding to one antenna port; that is, each channel parameter characterizes / represents the channel information corresponding to one antenna port. Alternatively, each antenna port may be jointly corresponding to I channel parameters; that is, the channel information corresponding to each resource includes the I channel parameters corresponding to that resource, or the channel information corresponding to each resource is composed of I channel parameters.

[0267] Furthermore, the number of I antenna ports is determined by the network device's configuration information. Alternatively, it can be determined by the terminal device based on the network device's configuration information (e.g., based on a power threshold, as described below), and then reported to the network device. Or, the terminal device can determine the number of ports itself and then report it to the network device.

[0268] Furthermore, I = P CSI-RS This means that all antenna ports are used for measurement. The following description uses I as an example.

[0269] For example, taking any one of the Ks resources as resource #1, and the channel information corresponding to resource #1 among the Ks channel information as channel information #1, channel information #1 can be determined based on the channel parameters corresponding to each antenna port in the port group corresponding to resource #1; that is, channel information #1 is determined based on the channel parameters corresponding to antenna ports #0 to #1-1 in the port group corresponding to resource #1.

[0270] Optionally, the channel parameters corresponding to antenna port #i (i.e., any one of the I antenna ports) are the CSI measurement results of the downlink reference signal received on antenna port #i.

[0271] Optionally, the terminal device can measure the downlink reference signal received on each antenna port in the port group corresponding to resource #1, and determine the measurement result corresponding to each antenna port as the channel parameter (or channel coefficient) corresponding to that antenna port.

[0272] For example, the downlink reference signal received by the terminal device on each of the antenna ports from antenna port #0 to antenna port #I-1, and the channel parameters corresponding to antenna port #i can be determined based on the following relationship (3):

[0273] Among them, h #1,i (f) represents the channel parameters corresponding to antenna port #i in the port group corresponding to resource #1; y #1,i (f) is the downlink reference signal received by the terminal device at antenna port #i in the port group corresponding to resource #1; For the downlink reference signal transmitted by the network device at antenna port #i in the port group corresponding to resource #1; (*) H denoted as conjugate transpose, f represents the frequency domain resource index (e.g., the unit of frequency domain resources can be any of the following: resource element (RE), resource block (RB), precoding granularity, or precoding resource block group), i = 0, 1, ..., I-1.

[0274] Alternatively, the downlink reference signal received by the terminal device on multiple antenna ports from antenna port #0 to antenna port #I-1, the channel parameters corresponding to antenna port #i can be determined based on the following relationship (4a):

[0275] Among them, h #1,i (f) represents the channel parameters corresponding to antenna port #i in the port group corresponding to resource #1; y #1 (f) is the downlink reference signal received by the terminal device in the port group corresponding to resource #1; For the downlink reference signal transmitted by the network device at antenna port #i in the port group corresponding to resource #1; (*) H This indicates the conjugate transpose.

[0276] Alternatively, the downlink reference signal received on antenna ports #0 to #I-1 is Y. #1 (f) Channel parameters H corresponding to antenna ports #0 to #I-1 #1 (f) can be determined based on the following relation (4b):

[0277] Among them, H #1 (f)=[h #1,0 (f),h #1,1 (f),…,h #1,I-1 (f)],Y #1 (f)=[y #1,0 (f),y #1,1 (f),…,y #1,I-1 (f)],X #1 (f)=[x #1,0 (f),x#1,1 (f),…,x #1,I-1 (f)],h #1,i (f) represents the channel parameters corresponding to antenna port #i in the port group corresponding to resource #1; Y #1 (f) is the downlink reference signal received by the terminal device in the port group corresponding to resource #1, X #1 (f) is the downlink reference signal sent by the network device in the port group corresponding to resource #1, i = 0, 1, ..., I-1.

[0278] Alternatively, the terminal device can obtain the channel parameters h corresponding to each antenna port through any other possible implementation method besides those described above. #1,i (f) This application does not impose any restrictions.

[0279] Optionally, after determining the channel parameters corresponding to each antenna port in the port group corresponding to resource #1 based on the above relationship (3) or relationship (4a), the terminal device can concatenate the channel parameters corresponding to I antenna ports to obtain the channel information corresponding to resource #1 (or, it can also be called: the channel information corresponding to the port group corresponding to resource #1). Alternatively, the terminal device can directly determine the channel information corresponding to resource #1 based on the above relationship (4b). Thus, the channel information corresponding to Ks resources is determined, i.e., Ks channel information.

[0280] Specifically, after determining the channel parameters corresponding to each of antenna ports #0 to #I-1, the terminal device can concatenate them into channel information #1. Specifically, the channel parameters corresponding to each of antenna ports #0 to #I-1 are of dimension P. RX A matrix of size × 1, where P RX This represents the number of receiving channels for the terminal device. The channel parameters corresponding to each port from antenna port #0 to antenna port #I-1 can be concatenated into a dimension P. RX A matrix of size I, where I antenna ports are some or all of the ports in the port group corresponding to resource #1 (i.e., P). CSI-RS (greater than or equal to I).

[0281] Similarly, in step S1005 above, the network device can also determine the channel parameters corresponding to each antenna port in the port group corresponding to the reference beam, and then determine the reference channel information based on the channel parameters corresponding to each antenna port. Specifically, the implementation of the network device determining the reference channel information is similar to the implementation of the terminal device determining the channel information #1 above. For details, please refer to the relevant description of channel information #1 above, which will not be repeated here.

[0282] Furthermore, as mentioned above, the reference channel information is the channel information corresponding to the reference resource, and the reference resource is one of the Ks resources. Therefore, the reference channel information can also be determined based on the channel parameters corresponding to the I antenna ports in the port group (i.e., the reference port group) corresponding to the reference resource. In other words, the reference channel information is determined according to I sets of reference channel parameters, or in other words, the reference channel information includes I sets of reference channel parameters; that is, the reference channel information is composed of I sets of reference channel parameters. Among these I sets of reference channel parameters, the i-th set of reference channel parameters is used to indicate the channel information corresponding to the i-th antenna port in the reference port group.

[0283] Specifically, since the reference resource is one of the Ks resources, and the Ks resources correspond to Ks ports, the reference port group is the port group corresponding to the reference resource in the Ks port groups.

[0284] It should be understood that the channel information corresponding to resource #1 calculated based on the above relations (3), (4a), and (4b) is the channel information of the antenna domain; that is, the Ks channel information determined based on any one of the above relations (3), (4a), or (4b) is the channel information of the Ks antenna domains.

[0285] Furthermore, after determining the channel information of the antenna domain corresponding to resource #1 based on any one of the above relationships (3), (4a), or (4b), the terminal device can also convert the channel information of the antenna domain to the spatial domain. Thus, the channel information of Ks spatial domains can be determined (i.e., the channel information of Ks spatial domains corresponding to Ks port groups (or Ks resources)).

[0286] Specifically, the channel information in the antenna domain and the channel information in the spatial domain can satisfy the following relationship (5): H′ #s (f)=H #s (f) F Relationship (5)

[0287] Among them, H #s (f) represents the channel information of any one of the Ks antenna domains; H′ #s (f) represents the spatial channel information corresponding to the channel information of any antenna domain, and F is the transformation matrix, which is used for information transformation between the antenna domain and the spatial domain.

[0288] For example, with H′ #s (f) Taking the channel information of the spatial domain corresponding to resource #1 as an example, i.e., H′ #s (f) is the channel information of the spatial domain corresponding to the port group corresponding to resource #1; and the channel parameters (e.g., h) of the antenna domain corresponding to each antenna port (e.g., antenna port #i) as described in the previous embodiments. #1,i(f) Channel information of the antenna domain corresponding to the port group to which the antenna port belongs (e.g., H #1 The relationship between (f) is similar, and the channel information (such as H′) of the spatial domain corresponding to the port group corresponding to resource #1 is also similar. #s (f) can also be the channel parameters (e.g., h′) in the spatial domain corresponding to each antenna port (e.g., antenna port #i) in the port group. #s,i (f) is spliced ​​together; thus, after determining the channel information of the spatial domain corresponding to the port group corresponding to resource #1 based on the above relationship (5), the channel parameters of the spatial domain corresponding to each antenna port in the port group can be determined based on the channel information of the spatial domain corresponding to the port group corresponding to resource #1.

[0289] Optionally, the transformation matrix can be a discrete fourier transform (DFT) matrix. Alternatively, the transformation matrix can be an inverse discrete fourier transform (IDFT) matrix. Or, the transformation matrix can be determined based on a first matrix, which is determined based on the channel information of the antenna domain corresponding to resource #1 (i.e., any one of the Ks resources).

[0290] For example, when the transformation matrix is ​​determined based on the first matrix, the transformation matrix can include the following two implementations:

[0291] As an example, the transformation matrix is ​​composed of A column vectors of the first matrix; that is, the transformation matrix includes A column vectors of the first matrix. The number of column vectors included in the first matrix is ​​greater than or equal to A.

[0292] For example, the A column vectors in the first matrix can be the first A column vectors in the first matrix (such as the 0th column vector to the (A-1th)th column vectors); or, the I column vectors in the first matrix can be any A column vectors in the first matrix, which is not limited in this application.

[0293] For example, the relationship between the first matrix and the transformation matrix can be indicated by the network device. For instance, the network device can indicate which column vectors A in the first matrix are used to construct the transformation matrix. Alternatively, the relationship between the first matrix and the transformation matrix can be determined by the terminal device and reported to the network device; this application is not limited to this. That is, A can be determined by the terminal device and informed to the network device, or it can be determined by the network device and informed to the terminal device.

[0294] Specifically, when column vector A in the first matrix is ​​the first A column vectors in the first matrix, the transformation matrix and the first matrix can satisfy the following relationship (5): F=V[:,0:A-1] Relationship (6)

[0295] Where F is the transformation matrix, V is the first matrix, and V[:,0:A-1] represents the first A columns of matrix V.

[0296] For example, V is a DFT matrix, an IDFT matrix, an oversampled DFT matrix, an oversampled IDFT matrix, or an identity matrix.

[0297] For example, in this case, the channel information of the first matrix and the antenna domain of resource #1 can satisfy the following relationship (7):

[0298] Where, N RB Let f be the number of RBs or subbands in the bandwidth corresponding to Ks resources, and let f be N. RB One of the corresponding multiple subcarriers, H #1 (f) represents the channel information of the antenna domain corresponding to resource #1, V is the first matrix, (*) H Σ represents the conjugate transpose, and Σ is the eigenvalue corresponding to V.

[0299] Optionally, the terminal device can utilize the P corresponding to resource 1. CSI-RS Each antenna port determines V such that the dimension of V is P. CSI-RS ×P CSI-RS Or I×I, thus allowing the selection of A column vectors from V to determine F. Alternatively, the terminal device can utilize P corresponding to resource 1. CSI-RS I antenna ports out of I antenna ports determine V, such that the dimension of V is I×I; thus, A column vectors can be selected from V to determine F.

[0300] Optionally, the transformation matrix can also be constructed from the row vectors of the first matrix A. In this case, the implementation of the transformation matrix can be found in the relevant description of the column vectors of the first matrix A above, and will not be repeated here.

[0301] As another example, the transformation matrix consists of A / 2 column vectors of the first matrix. The number of column vectors included in the first matrix is ​​greater than or equal to A / 2.

[0302] For example, the A / 2 column vector in the first matrix can be the first A / 2 column vectors in the first matrix (such as the 0th column vector to the A / 2-1th column vector); or, the A / 2 column vector in the first matrix can be any A / 2 column vector in the first matrix, which is not limited in this application.

[0303] For example, the relationship between the first matrix and the transformation matrix can be indicated by the network device. For instance, the network device can indicate which A / 2 column vectors in the first matrix are used to construct the transformation matrix. Alternatively, the relationship between the first matrix and the transformation matrix can be determined by the terminal device and reported to the network device; this application is not limited to this. That is, the value of A / 2 can be determined by the terminal device and communicated to the network device, or it can be determined by the network device and communicated to the terminal device.

[0304] Specifically, when the A / 2 column vector in the first matrix is ​​the first A / 2 column vector in the first matrix, the transformation matrix and the first matrix can satisfy the following relationship (8):

[0305] Where F is the transformation matrix, V′ is the first matrix, and V′[∶,0:A / 2-1] represents the first A / 2 columns of matrix V′.

[0306] For example, in this example, the channel information of the first matrix and the antenna domain of resource #1 can satisfy the following relationship (9):

[0307] Where, N RB Let f be the number of RBs or subbands in the bandwidth corresponding to Ks resources, and let f be N. RB One of the corresponding multiple subcarriers, H #1 (f) represents the channel information of the antenna domain for resource #1, H #1 (f)[:,0:A / 2-1] represents matrix H #1 (f) The first A / 2 columns, H #1 (f)[:,A / 2-1:A-1] represents matrix H #1 In (f), columns A / 2-1 to A-1, V′ is the first matrix, (*) H Σ represents the conjugate transpose, and Σ is the eigenvalue corresponding to V′.

[0308] Alternatively, the terminal device may obtain the transformation matrix F through any other possible implementation besides those described above, which is not limited in this application.

[0309] Optionally, the terminal device can utilize the P corresponding to resource 1. CSI-RS Each antenna port determines V′, such that the dimension of V′ is P. CSI-RS ×P CSI-RS Therefore, A row vectors can be selected from V′ to determine F. Alternatively, the terminal device can utilize P corresponding to resource 1. CSI-RS I antenna ports out of I antenna ports determine V′, such that the dimension of V′ is I×I; thus, A row vectors can be selected from V′ to determine F.

[0310] Optionally, the transformation matrix can also be constructed from the A / 2 row vectors of the first matrix. In this case, the implementation of the transformation matrix can be found in the relevant description of the A / 2 column vectors of the first matrix above, and will not be repeated here.

[0311] For example, in the two examples above, the phases of V and / or V′ are normalized, that is, the phases of each parameter in the first row vector of matrix V and / or matrix V′ are the same; for example, the phase of each parameter in the first row vector of matrix V and / or matrix V′ is 0 phase, or the phase of each parameter can also be other values, which are not limited in this application.

[0312] For example, the terminal device can determine the channel information corresponding to each of the Ks resources based on any one of the above relationships (3), (4a), and (4b). In this case, it can also be considered that the Ks channel information refers to the channel information of the antenna domain corresponding to each of the Ks resources. Alternatively, the terminal device can determine the channel information corresponding to each of the Ks resources based on the above relationship (5). In this case, it can also be considered that the Ks channel information refers to the channel information of the spatial domain corresponding to each of the Ks resources.

[0313] (2) Implementation of M channel information:

[0314] Optionally, each of the M resources corresponds to one of the M channel information items. That is, each of the M resources corresponds to one channel information item among the M channel information items. For example, the value of M can be determined autonomously by the terminal device; or, the value of M can be indicated by the network device to the terminal device. For instance, when the value of M is indicated by the network device, the value of M can be located in the channel information reporting configuration information.

[0315] Specifically, M can be a positive integer greater than or equal to 1. For example, M can be a positive integer greater than or equal to 1 and less than or equal to 4.

[0316] As an example, the M channel information items are some or all of the Ks channel information items. Here, M is a positive integer less than or equal to Ks.

[0317] For example, in this case, the M resources are some or all of the Ks resources. Therefore, the terminal device can autonomously decide to select M channel information from the Ks channel information. That is, the terminal device can determine M resources, and the channel information corresponding to each of these M resources is the M channel information.

[0318] Alternatively, the terminal device can determine the M channel information based on the instructions from the network device. For example, the network device can indicate M resources to the terminal device (such as the numbers of these M resources among Ks resources), so that the terminal device can determine the channel information corresponding to each of the M resources based on the indication. Or, the network device can indicate M of the M resources to the terminal device. R One resource; of which M R It is a positive integer greater than or equal to 1 and less than M. Therefore, the terminal device can determine M based on this indication. R Each resource corresponds to a channel information. Furthermore, the terminal device can divide the M values ​​from the Ks resources. R Among resources other than those in the MM (Multi-Resource Optimization) system, autonomous decision-making is used to determine the MM. R One resource, and thus determine the MM R The channel information corresponding to each resource is used to determine M channel information.

[0319] For example, as mentioned above, each of the Ks channel information is determined based on the channel parameters corresponding to each antenna port in the port group corresponding to that channel information; that is, in this example, each of the M channel information is determined based on the channel parameters corresponding to each antenna port in the port group corresponding to that channel information.

[0320] Specifically, for any antenna port (such as antenna port #i) among the ports corresponding to any channel information in the M channel information, the implementation of its corresponding channel parameters (i.e., the channel parameters corresponding to antenna port #i) can be referred to either of the two implementation methods shown in the above relations (3) to (9), and will not be repeated here.

[0321] As another example, the M channel information is determined based on the coefficients corresponding to the Ks channel information and the M resources, respectively. Here, M is a positive integer greater than Ks.

[0322] For example, let Ks channel information be A0, A1, ..., A Ks-1 A k The dimension is N UE ×I CSI-RS,k ; where N UE I represents the number of receive antenna ports of the terminal device. CSI-RS,k Let Ks be the number of antenna ports included in the k-th antenna port group among the Ks port groups corresponding to Ks channel information. The coefficient corresponding to the m-th channel information (i.e., any one of the M channel information) can be expressed as: Therefore, the Ks channel information and the M channel information can satisfy the following relationship (10):

[0323] Among them, H m This refers to the m-th channel information out of M channel information. Let A be the coefficient corresponding to the m-th resource out of M resources. k Let K be the k-th channel information among Ks channel information; m = 0, 1, ..., M-1; k = 0, 1, ..., Ks-1. This design, applied to the HBF architecture, allows network devices to transmit fewer reference signals, while terminal devices simulate more channel information based on the weighting coefficients corresponding to the port groups, thus reducing communication overhead. Optionally, this design can also be applied to digital beamforming architectures or simulated beamforming architectures.

[0324] For example, based on the foregoing, each of the Ks channel information is determined based on the channel parameters corresponding to each antenna port in the port group corresponding to that channel information; wherein the dimension of the channel parameters corresponding to each antenna port is N. UE ×1, so that the channel parameters corresponding to I antenna ports can be concatenated to form A in the above relationship (10). k .

[0325] Furthermore, H in relation (10) m The dimension of (i.e., the m-th channel information) is N. UE ×I CSI-RS,m Among them, I CSI-RS,m =I CSI-RS,k That is, H m The corresponding port group also includes I antenna ports, thus H m It is determined based on the channel parameters corresponding to each of the I antenna ports, where the dimension of the channel parameter corresponding to each of the I antenna ports is N. UE ×1.

[0326] For example, based on the foregoing embodiments, the Ks channel information can be channel information of Ks antenna domains, or it can be channel information of Ks spatial domains. Therefore, when the Ks channel information is channel information of Ks antenna domains, the corresponding M channel information is also channel information of M antenna domains. When the Ks channel information is channel information of Ks spatial domains, the corresponding M channel information is also channel information of M spatial domains.

[0327] (3) Implementation of P channel information:

[0328] Optionally, after determining the M channel information, the terminal device can determine P channel information based on the M channel information. The P channel information can be some or all of the M channel information.

[0329] For example, the value of P can be indicated by the network device, such as when the channel information reporting configuration information includes the value of P. Specifically, the value of P can be determined based on M, such as P being any positive integer less than or equal to M. For example, the value of P can be one of 1, 2, 4, 6, or 8.

[0330] Optionally, each of the P channel information corresponds to one of the P resources; that is, each of the P resources corresponds to one of the channel information in the P channel information.

[0331] For example, as described above, each of the M channel information pieces is determined based on the channel parameters corresponding to the I antenna ports in the port group corresponding to the resource corresponding to that channel information; and the P channel information pieces are some or all of the M channel information pieces. Therefore, each of the P channel information pieces is determined based on the channel parameters corresponding to the I antenna ports in the port group corresponding to the resource corresponding to that channel information.

[0332] In other words, the p-th channel information among P channel information (i.e., any channel information among P channel information) is determined based on I sets of p-th channel parameters. That is, the p-th channel information among P channel information includes I sets of p-th channel parameters, or in other words, the p-th channel information among P channel information is composed of I sets of p-th channel parameters. Specifically, the i-th set of p-th channel parameters in this I-set of p-th channel parameters is used to indicate the channel information corresponding to the i-th antenna port (i.e., antenna port #i) in the p-th port group; the p-th port group is the port group corresponding to the p-th resource among P resources, and the p-th resource corresponds to the p-th port group.

[0333] Specifically, the p-th channel parameter refers to the channel parameter corresponding to each antenna port in the p-th port group; therefore, the channel parameters corresponding to the I antenna ports in the p-th port group are the I-th channel parameters. The p-th channel parameter in the i-th group is the channel parameter corresponding to any one of the I antenna ports.

[0334] For example, since the P channel information pieces are part or all of the M channel information pieces, and the M channel information pieces can be channel information of M antenna domains or M spatial domains, when the M channel information pieces are channel information of M antenna domains, the corresponding P channel information pieces are also channel information of P antenna domains. Therefore, the channel parameter corresponding to any antenna port in each port group (i.e., the p-th channel parameter of the i-th group) is also a channel parameter of the antenna domain. Similarly, when the M channel information pieces are channel information of M spatial domains, the corresponding P channel information pieces are also channel information of P spatial domains. Therefore, the channel parameter corresponding to any antenna port in each port group (i.e., the p-th channel parameter of the i-th group) is also a channel parameter of the spatial domain.

[0335] It should be noted that the above example describes how a terminal device determines M channel information based on Ks channel information, and then determines P channel information. In fact, in this application, the terminal device can also directly determine P channel information based on Ks channel information. In this case, the implementation of P channel information is similar to the implementation of M channel information (i.e., M channel information can be replaced by P channel information). For details, please refer to the relevant description of M channel information above. When P = Ks, it can also be considered that the terminal device directly determines P channel information based on Ks reference signals (i.e., Ks channel information can be replaced by P channel information). This application does not impose any limitations.

[0336] The above is an explanation of "p channel information". The following is a detailed introduction to the "P group channel association characteristics" involved in the above embodiments.

[0337] Optionally, the p-th group of channel correlation characteristics is determined based on the I-th group of channel correlation parameters. The i-th group of channel correlation parameters in the I-th group is used to indicate the information difference between the i-th group of reference channel parameters and the i-th group of p-th channel parameters.

[0338] For example, the p-th group of channel association characteristics can be formed by concatenating I group of channel association parameters. Specifically, the implementation of concatenating I group of channel association parameters into the p-th group of channel association characteristics is similar to the implementation of "channel information formed by concatenating I channel parameters" described in the above embodiments. For details, please refer to the relevant descriptions in the above embodiments, which will not be repeated here.

[0339] For example, each of the I antenna ports in the p-th port group corresponds to one of the I antenna ports in the reference port group. That is, any one of the I antenna ports in the p-th port group corresponds to one of the I antenna ports in the reference port group. For ease of description, the following example uses the case where the i-th antenna port in the p-th port group corresponds to the i-th antenna port in the reference port group; this will be described consistently and will not be elaborated further.

[0340] As mentioned above, each of the P port groups corresponding to the reference port group and the P resources contains I antenna ports; and each antenna port corresponds to a set of channel parameters (i.e., each antenna port in the reference port group corresponds to a set of reference channel parameters, and each antenna port in the p-th port group of the P port groups corresponds to a set of channel parameters (i.e., the p-th channel parameters)).

[0341] Therefore, the p-th channel correlation characteristic in the P-group channel correlation characteristics (i.e., any one of the channel correlation characteristics in the P-group channel correlation characteristics) is composed of the information difference between the p-th channel parameter corresponding to the i-th antenna port in the I antenna ports of the p-th port group (i.e., the channel parameter corresponding to any one of the I antenna ports) and the reference channel parameter corresponding to the i-th antenna port in the I antenna ports of the reference port group (i.e., the channel parameter corresponding to any one of the antenna ports of the reference port group).

[0342] For example, the channel association parameters of the i-th group in the p-th group of channel association characteristics (i.e., the information differences corresponding to each antenna port) can include the following two possible implementations:

[0343] Optionally, the i-th group of channel association parameters is determined based on the i-th group of reference channel parameters and the i-th group of p-th channel parameters. For example, the i-th group of channel association parameters, the i-th group of reference channel parameters, and the i-th group of p-th channel parameters can satisfy the following relationship (11):

[0344] Where, d p,i h′ represents the channel association parameters of the i-th group (i.e., the channel association parameters corresponding to the i-th antenna port in the p-th port group). #s,i For the i-th group of reference channel parameters (i.e., the reference channel parameters corresponding to the i-th antenna port in the reference port group), h′ #p,i Let p be the channel parameters of the i-th group (i.e., the channel parameters corresponding to the i-th antenna port in the p-th port group); i = 0, 1, ..., I-1; p = 0, 1, ..., P-1, (*) H This indicates the conjugate transpose.

[0345] Specifically, h′ #s,i It can be the reference channel parameter in the spatial domain corresponding to the i-th antenna port in the reference port group, or it can be the reference channel parameter in the antenna domain corresponding to the i-th antenna port in the reference port group. Where h′ #s,i When the reference channel parameters for the spatial domain corresponding to the i-th antenna port in the reference port group are given, h′ accordingly... #p,i Let h′ be the channel parameters in the spatial domain corresponding to the i-th antenna port in the p-th port group; when h′ #s,i When the reference channel parameters are the antenna domain corresponding to the i-th antenna port in the reference port group, h′ is correspondingly... #p,i Let h′ be the channel parameters of the antenna domain corresponding to the i-th antenna port in the p-th port group. #s,i With h′ #p,i The implementation can be found in the above embodiments, h. #1,i (f)) or h′ #s,iThe relevant description of (f) will not be repeated here.

[0346] Optionally, the i-th group of channel association parameters is determined based on the i-th group of reference channel parameters and the i-th group of p-th channel parameters, including: the i-th group of channel association parameters is determined by N sub-reference channel parameters and N p-th sub-channel parameters. Wherein, the i-th group of reference channel parameters includes N sub-reference channel parameters; the i-th group of p-th channel parameters includes N p-th sub-channel parameters; N is a positive integer greater than 1.

[0347] For example, any antenna port in the reference port group corresponds to N sub-reference channel parameters. In other words, the reference channel information corresponding to the i-th antenna port in the reference port group (i.e., the i-th group of reference channel parameters) is composed of N sub-reference channel parameters, that is, the i-th group of reference channel parameters includes N sub-reference channel parameters.

[0348] Similarly, any antenna port in the p-th port group corresponds to N sub-channel parameters. In other words, the channel information corresponding to the i-th antenna port in the p-th port group (i.e., the p-th channel parameters of the i-th group) is composed of N p-th sub-channel parameters. That is, the i-th group of reference channel parameters includes N p-th sub-channel parameters.

[0349] For example, the i-th group of channel correlation parameters can be implemented based on the following four cases:

[0350] Case 1: N is the number of frequency domain resources (such as subcarriers) in the p-th resource (i.e., the resource corresponding to the p-th port group). In other words, each of the P resources contains N frequency domain resources.

[0351] For example, each of the Ks resources also includes N frequency domain resources; therefore, N can be considered as the number of frequency domain resources contained in any one of the Ks resources.

[0352] Optionally, the i-th group of channel association parameters is determined based on N sub-reference channel parameters and N p-th sub-channel parameters, including: the i-th group of channel association parameters is determined based on N groups of sub-channel association parameters, wherein the n-th group of sub-channel association parameters in the N groups of sub-channel association parameters is used to indicate the information difference between the n-th sub-reference channel parameter and the n-th p-th sub-channel parameter, n = 0, 1, ..., N-1.

[0353] For example, the nth sub-reference channel parameter is one of the N sub-reference channel parameters, and the nth pth sub-channel parameter is one of the N pth sub-channel parameters.

[0354] Specifically, since N is the number of frequency domain resources contained in any one of the Ks resources, i.e., n is the index of the frequency domain resources in any one resource, the nth sub-reference channel parameter is the channel information corresponding to the frequency domain resource #n in the reference resource; correspondingly, the nth pth sub-channel parameter is the channel information corresponding to the frequency domain resource #n in any one of the P resources.

[0355] Optionally, each antenna port in each of the P port groups corresponds to N frequency domain resources. Within the same port group, the N frequency domain resources corresponding to the I antenna ports are identical. Similarly, the reference resources also include N frequency domain resources. Each antenna port in the reference port group corresponds to these N frequency domain resources.

[0356] Optionally, the N p-th sub-channel parameters corresponding to any antenna port in the p-th port group correspond to the N frequency domain resources corresponding to any antenna port in the p-th port group. Similarly, the N sub-reference channel parameters corresponding to any antenna port in the reference port group correspond to the N frequency domain resources corresponding to any antenna port in the reference port group.

[0357] As an example, both the sub-channel parameters and the sub-reference channel parameters are frequency domain information.

[0358] Optionally, in this example, the sub-channel parameter is used to indicate (or characterize / represent) the channel information of the frequency domain corresponding to one of the N frequency domain resources corresponding to an antenna port in the p-th port group. That is, the nth sub-channel parameter among the N p-th sub-channel parameters is used to indicate (or characterize / represent) the channel information of the frequency domain corresponding to the nth frequency domain resource among the N frequency domain resources (i.e., the N frequency domain resources contained in the p-th resource) corresponding to the i-th antenna port in the p-th port group.

[0359] Similarly, sub-reference channel parameters are used to indicate (or characterize / represent) the channel information in the frequency domain corresponding to one of the N frequency domain resources corresponding to an antenna port in the reference port group. That is, the nth sub-reference channel parameter among the N sub-reference channel parameters is used to indicate (or characterize / represent) the channel information in the frequency domain corresponding to the nth frequency domain resource among the N frequency domain resources (i.e., the N frequency domain resources contained in the reference resource) corresponding to the i-th antenna port in the reference port group.

[0360] Therefore, the sub-channel association parameter is used to indicate the information difference between the channel information (i.e., sub-channel parameter) of the frequency domain corresponding to the nth frequency domain resource of the i-th antenna port in the p-th port group and the channel information (i.e., sub-reference channel parameter) of the frequency domain corresponding to the nth frequency domain resource of the i-th antenna port in the reference port group.

[0361] Specifically, the sub-channel correlation parameters of the nth group (i.e., the channel correlation characteristics corresponding to the nth frequency domain resource among the N frequency domain resources (i.e., the N frequency domain resources contained in the pth resource) of the i-th antenna port in the p-th port group), the sub-channel parameters corresponding to the nth frequency domain resource among the N frequency domain resources corresponding to the i-th antenna port in the p-th port group, and the sub-reference channel parameters corresponding to the nth frequency domain resource among the N frequency domain resources corresponding to the i-th antenna port in the reference port group can satisfy the following relationship (12a):

[0362] Where, d p,i (n) represents the channel correlation characteristics of the nth frequency domain resource among the N frequency domain resources (i.e., the N frequency domain resources contained in the pth resource) of the nth sub-channel correlation parameters (i.e., the channel correlation characteristics of the nth frequency domain resource among the N frequency domain resources corresponding to the i-th antenna port in the p-th port group). #s,i (n) represents the sub-reference channel parameter corresponding to the nth frequency domain resource among the N frequency domain resources corresponding to the i-th antenna port in the reference port group, h′ #p,i (n) represents the sub-channel parameter corresponding to the nth frequency domain resource among the N frequency domain resources corresponding to the i-th antenna port in the p-th port group; i = 0, 1, ..., I-1; p = 0, 1, ..., P-1, n = 0, 1, ..., N RB -1, N RB Let N = N_s be the number of RBs or subbands in the bandwidth belonging to the Ks resources. RB ,(*) H This indicates the conjugate transpose.

[0363] Since N is the number of frequency domain resources contained in any one of the Ks resources, i.e., n is the index of the frequency domain resource in any one resource; therefore, in this example, n can also be replaced by f. That is, in this example, n and f are the same and can be substituted for each other, both representing the index of the frequency domain resource in a resource. At this time, the above relation (12a) is replaced by the following relation (12b):

[0364] Where, d p,i (f) represents the channel correlation characteristics of the f-th frequency domain resource (i.e., the n-th frequency domain resource) among the N frequency domain resources (i.e., the N frequency domain resources contained in the p-th resource) of the f-th sub-channel correlation parameters, h′ #s,i (f) represents the sub-reference channel parameters corresponding to the f-th frequency domain resource (i.e., the n-th frequency domain resource) among the N frequency domain resources corresponding to the i-th antenna port in the reference port group, h′ #p,i(f) represents the sub-channel parameters corresponding to the f-th frequency domain resource (i.e., the n-th frequency domain resource) among the N frequency domain resources corresponding to the i-th antenna port in the p-th port group; i = 0, 1, ..., I-1; p = 0, 1, ..., P-1; f = 0, 1, ..., N RB -1, N RB Let N = N_s be the number of RBs or subbands in the bandwidth belonging to the Ks resources. RB ,(*) H This indicates the conjugate transpose.

[0365] Furthermore, h′ in the above relation (12a) #p,i (n), and h′ in relation (12b) #p,i (f) can be the spatial sub-channel parameter of the nth frequency domain resource among the N frequency domain resources corresponding to the i-th antenna port in the p-th port group, or it can be the antenna domain sub-channel parameter of the nth frequency domain resource among the N frequency domain resources corresponding to the i-th antenna port in the p-th port group. Where h′ #p,i (n) and h′ #p,i (f) represents the spatial sub-channel parameter corresponding to the nth frequency domain resource among the N frequency domain resources corresponding to the i-th antenna port in the p-th port group. Accordingly, h′ in the above relationship (12a) is... #s,i (n) and h′ in relation (12b) #s,i (f) represents the spatial parameters of the nth frequency domain resource among the N frequency domain resources corresponding to the i-th antenna port in the reference port group.

[0366] When h′ #p,i (n) and h′ #p,i (f) represents the sub-channel parameter of the antenna domain corresponding to the nth frequency domain resource among the N frequency domain resources corresponding to the i-th antenna port in the p-th port group. Accordingly, h′ in the above relationship (12a) is... #s,i (n) and h′ in relation (12b) #s,i (f) represents the sub-reference channel parameters of the antenna domain corresponding to the nth frequency domain resource among the N frequency domain resources corresponding to the i-th antenna port in the reference port group.

[0367] Specifically, h′ #p,i (n) and h′ #p,i (f), h′ #s,i (n) and h′ #s,i (f) can be implemented by referring to h in the above embodiments. #1,i (f)) or h′ #s,i The relevant description of (f) will not be repeated here.

[0368] As another example, both sub-channel parameters and sub-reference channel parameters are information from domains other than the frequency domain.

[0369] For example, taking the frequency domain in the above "as an example" as the first frequency domain, the "other domains" in this example can also be called the second frequency domain. Specifically, the information in the second frequency domain can be obtained by performing DFT or IDFT on the information in the aforementioned first frequency domain. Alternatively, the second frequency domain can be the time domain, in which case, in this example, both the sub-channel parameters and the sub-reference channel parameters are time-domain information. The following description uses the second frequency domain as the time domain as an example.

[0370] Optionally, when the sub-channel parameter is time-domain information, the sub-channel parameter is used to indicate (or characterize / represent) the time-domain channel information corresponding to one of the N frequency-domain resources corresponding to an antenna port in the p-th port group. That is, the nth sub-channel parameter among the N p-th sub-channel parameters is used to indicate (or characterize / represent) the time-domain channel information corresponding to the nth frequency-domain resource among the N frequency-domain resources (i.e., the N frequency-domain resources contained in the p-th resource) corresponding to the i-th antenna port in the p-th port group.

[0371] For example, the time-domain channel information (or time-domain channel information) corresponding to a frequency-domain resource can be understood as follows: after determining the channel information corresponding to the frequency-domain resource based on the frequency-domain resource, the channel information can be converted into time-domain information, which is the time-domain channel information. For example, the sub-channel parameter corresponding to the nth frequency-domain resource corresponding to the i-th antenna port in the p-th port group is h′ in the above relationship (12a). #p,i (n), or h′ in relation (12b) #p,i (f). Furthermore, it can be converted into time-domain channel information.

[0372] The sub-channel parameters corresponding to the nth frequency domain resource of the i-th antenna port in the p-th port group are obtained through h′. #p,i (n) represents an example, h′ #p,i (n) and its corresponding time-domain channel information can satisfy the following relationship (13): [h″ #p,i (t0),h″ #p,i (t1),…,h″ #p,i (t N-1 )]=[h′ #p,i (n0),h′ #p,i (n1),…,h′ #p,i (n N-1 F1 relation (13)

[0373] Where n0, n1, ..., n N-1Let t0, t1, ..., t be different values ​​of N (i.e., different index values ​​of N frequency domain resources). N-1 These are the time-domain parameters corresponding to different values ​​of N (e.g., n0 corresponds to t0, n1 corresponds to t1, ..., n). N-1 Corresponding to t N-1 ), thus, h″ #p,i (t0) and h′ #p,i (n0) corresponds to (i.e., h″) #p,i (t0) is h′ #p,i (n0) corresponds to the time-domain channel information), h″ #p,i (t0) and h′ #p,i (n0) corresponds to (i.e., h″) #p,i (t0) is h′ #p,i (n0) corresponds to the channel information in the time domain), ..., h″ #p,i (t N-1 ) and h′ #p,i (n N-1 ) corresponds to (i.e. h″) #p,i (t N-1 ) is h′ #p,i (n N-1 (corresponding to the channel information in the time domain); F1 is the matrix used for the correlation transformation between time domain information and frequency domain information.

[0374] It should be understood that in this application, n0 represents n=0, n1 represents n=1, ..., n N-1 This represents n = N-1; similarly, t0 represents t = 0, t1 represents t = 1, ..., t N-1 This represents t = N-1. This will be described uniformly here and will not be elaborated further.

[0375] Similarly, when the sub-channel parameters are time-domain information, the sub-reference channel is used to indicate (or characterize / represent) the time-domain channel information corresponding to one of the N frequency-domain resources corresponding to an antenna port in the reference port group. That is, the nth sub-reference channel parameter among the N sub-reference channel parameters is used to indicate (or characterize / represent) the time-domain channel information corresponding to the nth frequency-domain resource among the N frequency-domain resources (i.e., the N frequency-domain resources contained in the reference resource) corresponding to the i-th antenna port in the reference port group.

[0376] The time-domain channel information (or time-domain channel information) corresponding to the frequency-domain resource can be understood as follows: after determining the channel information corresponding to the frequency-domain resource based on the frequency-domain resource, the channel information can be converted into time-domain information, which is the time-domain channel information. For example, the sub-reference channel parameter corresponding to the nth frequency-domain resource corresponding to the i-th antenna port in the p-th port group can be h′ in the above relationship (12a). #s,i(n), or h′ in relation 12(b) #s,i (f) Furthermore, it can be converted into time-domain channel information. Specifically, h′ #s,i (n) or h′ #s,i (f) The realization of converting channel information into the time domain, and the relationship (13) above, where h′ #p,i The implementation of converting (n) into its corresponding time-domain channel information is similar. For details, please refer to the relevant description of the above relationship (13), which will not be repeated here.

[0377] Therefore, when the sub-channel parameters are time-domain information, the sub-channel association parameters are used to indicate the information difference between the time-domain channel information (i.e., sub-channel parameters) corresponding to the nth frequency domain resource corresponding to the i-th antenna port in the p-th port group and the time-domain channel information (i.e., sub-reference channel parameters) corresponding to the nth frequency domain resource corresponding to the i-th antenna port in the reference port group.

[0378] Specifically, the sub-channel correlation parameters of the nth group (i.e., the information difference between the nth time-domain sub-channel parameter among the N time-domain sub-channel parameters corresponding to the i-th antenna port in the p-th port group and the nth time-domain sub-reference channel parameter among the N time-domain sub-reference channel parameters corresponding to the i-th antenna port in the reference port group), the nth time-domain sub-channel parameter among the N time-domain sub-channel parameters corresponding to the i-th antenna port in the p-th port group, and the nth time-domain sub-reference channel parameter among the N time-domain sub-reference channel parameters corresponding to the i-th antenna port in the reference port group can satisfy the following relationship (14a), that is, the above relationship (12a) can be replaced by the following relationship (14a):

[0379] Where, d′ p,i (n) represents the correlation parameters of the nth sub-channel, h″ #s,i (n) represents the nth time-domain sub-reference channel parameter among the N time-domain sub-reference channel parameters corresponding to the i-th antenna port in the reference port group, h″ #p,i (n) represents the nth time-domain sub-channel parameter among the N time-domain sub-channel parameters corresponding to the i-th antenna port in the p-th port group; i = 0, 1, ..., I-1; p = 0, 1, ..., P-1, n = 0, 1, ..., N RB -1, N RB Let N = N_s be the number of RBs or subbands in the bandwidth belonging to the Ks resources. RB ,(*) H This indicates the conjugate transpose.

[0380] Since N is the number of time-domain parameters corresponding to the frequency-domain resources contained in any one of the Ks resources, i.e., n is the index of the time-domain parameter corresponding to the frequency-domain resource in any one resource; therefore, in this example, n can also be replaced by t. That is, in this example, n and t are the same and can be substituted for each other, both representing the index of the time-domain parameter corresponding to the frequency-domain resource in a resource. At this time, the above relation (14a) is replaced by the following relation (14b):

[0381] Where, d′ p,i (t) represents the correlation parameters of the t-th sub-channel (i.e., the correlation parameters of the n-th sub-channel), h″ #s,i (t) represents the sub-reference channel parameter in the t-th time domain (the sub-channel parameter in the n-th time domain) among the N time-domain sub-reference channel parameters corresponding to the i-th antenna port in the reference port group, h″ #p,i (t) represents the t-th time-domain sub-channel parameter (i.e., the n-th time-domain sub-channel parameter) among the N time-domain sub-channel parameters corresponding to the i-th antenna port in the p-th port group; i = 0, 1, ..., I-1; p = 0, 1, ..., P-1, t = 0, 1, ..., N RB -1, N RB Let N = N_s be the number of RBs or subbands in the bandwidth belonging to the Ks resources. RB ,(*) H This indicates the conjugate transpose.

[0382] In one implementation, the terminal device can report N sets of sub-channel association parameters corresponding to each antenna port in its determined P port groups; or, the terminal device can report K sets of sub-channel association parameters from the N sets of sub-channel association parameters corresponding to each antenna port in the P port groups. K is a positive integer less than N.

[0383] For example, taking N sets of sub-channel association parameters as time-domain information, the terminal device can determine the N sets of sub-channel association parameters corresponding to each antenna port in the P port groups based on the above relationship (14a) or relationship (14b). Thus, the terminal device can report K time-domain indices t0, t1, ..., t K-1 The time-domain parameters can be reported; furthermore, the sub-channel association parameters corresponding to the K time-domain parameters can be reported from the N groups of sub-channel association parameters corresponding to each antenna port in the P port groups. Specifically, the K time-domain parameters can be determined autonomously by the terminal device, or they can be indicated to the terminal device by the network device.

[0384] Optionally, the terminal device reports N sets of sub-channel association parameters corresponding to each antenna port in the P port groups it has determined, including: the channel association characteristics (i.e., P sets of channel association characteristics) corresponding to the P port groups reported by the terminal device.

[0385] Specifically, the terminal device can determine any one of the N sets of sub-channel association parameters (i.e., the nth set of sub-channel association parameters, such as d′) for each antenna port in the P port groups based on any one of the above relationships (12a), (12b), (14a), or (14b). p,i (n) or d p,i (f) or d′ p,i (t)); thus determining the channel association parameters (i.e., the i-th group of channel association parameters) corresponding to each antenna port in the P port groups, that is, concatenating the N groups of sub-channel association parameters into the channel association parameter. Further, based on the I groups of channel association parameters corresponding to the I antenna ports in the P port groups, determining the channel association characteristics corresponding to each port group (or each resource in the P resources) in the P port groups. That is, concatenating the I groups of channel association parameters into the channel association characteristics.

[0386] Case 2: N is the number of frequency points belonging to the frequency domain resources among the Ks resources.

[0387] For example, the frequency points of the frequency domain resources contained in P resources are the same as those of the frequency domain resources in Ks resources. Therefore, N can also be considered as the number of frequency points of the frequency domain resources contained in P resources.

[0388] Optionally, each antenna port in each of the P port groups corresponds to N frequency points. All N frequency points corresponding to each antenna port are identical. Similarly, the reference resources also include N frequency domain resources. Each antenna port in the reference port group corresponds to these N frequency points.

[0389] Optionally, the N p-th sub-channel parameters corresponding to any antenna port in the p-th port group correspond to the N frequency points corresponding to any antenna port in the p-th port group. Similarly, the N sub-reference channel parameters corresponding to any antenna port in the reference port group correspond to the N frequency points corresponding to any antenna port in the reference port group.

[0390] As an example, both the sub-channel parameters and the sub-reference channel parameters are frequency domain information.

[0391] Optionally, in this example, the sub-channel parameter is used to indicate (or characterize / represent) the channel information in the frequency domain corresponding to one of the N frequency points corresponding to an antenna port in the p-th port group. That is, the nth sub-channel parameter among the N p-th sub-channel parameters is used to indicate (or characterize / represent) the channel information in the frequency domain corresponding to the nth frequency point among the N frequency points corresponding to the i-th antenna port in the p-th port group.

[0392] Similarly, sub-reference channel parameters are used to indicate (or characterize / represent) the channel information in the frequency domain corresponding to one of the N frequency points corresponding to an antenna port in the reference port group. That is, the nth sub-reference channel parameter among the N sub-reference channel parameters is used to indicate (or characterize / represent) the channel information in the frequency domain corresponding to the nth frequency point among the N frequency points corresponding to the i-th antenna port in the reference port group.

[0393] Specifically, the channel correlation parameters of the i-th group (i.e., the channel correlation characteristics corresponding to the i-th antenna port in the p-th port group), the N sub-channel parameters corresponding to the i-th antenna port in the p-th port group (i.e., the N p-th sub-channel parameters), and the N sub-reference channel parameters corresponding to the i-th antenna port in the reference port group can satisfy the following relationship (15a-1) or relationship (15a-2):

[0394] Where, d p,i Let h′ be the channel correlation parameter of the i-th group (i.e., the channel correlation characteristic corresponding to the n-th frequency point among the N frequency points corresponding to the i-th antenna port in the p-th port group). #s,i (n) represents the sub-reference channel parameter corresponding to the nth frequency point among the N frequency points corresponding to the i-th antenna port in the reference port group, h′ #p,i (n) represents the sub-channel parameter corresponding to the nth frequency point among the N frequency points corresponding to the i-th antenna port in the p-th port group, and f is any one of the N frequency points (i.e., the nth frequency point among the N frequency points); i = 0, 1, ..., I-1; p = 0, 1, ..., P-1, f = 0, 1, ..., N RB -1, N RB Let N = N_s be the number of RBs or subbands in the bandwidth belonging to the Ks resources. RB ,(*) H This indicates the conjugate transpose.

[0395] Since N is the number of frequency points belonging to the frequency domain resources among the Ks resources, i.e., n is the index of any one of the N frequency points belonging to the frequency domain resources among the Ks resources; therefore, in this example, n can also be replaced by f. That is, in this example, n and f are the same and can be substituted for each other, both representing the index of any one of the N frequency points. At this time, the above relation (15a-1) is replaced by the following relation (15b-1), and relation (15a-2) is replaced by the following relation (15b-2):

[0396] Where, d p,i Let h′ be the channel correlation parameter of the i-th group (i.e., the channel correlation characteristic corresponding to the n-th frequency point among the N frequency points corresponding to the i-th antenna port in the p-th port group). #s,i (f) represents the sub-reference channel parameters corresponding to the f-th frequency point (i.e., the n-th frequency point) among the N frequency points corresponding to the i-th antenna port in the reference port group, h′ #p,i (f) represents the sub-channel parameter corresponding to the f-th frequency point (i.e., the n-th frequency point) among the N frequency points corresponding to the i-th antenna port in the p-th port group, where f is any one of the N frequency points (i.e., the n-th frequency point among the N frequency points); i = 0, 1, ..., I-1; p = 0, 1, ..., P-1, f = 0, 1, ..., N RB -1, N RB Let N = N_s be the number of RBs or subbands in the bandwidth belonging to the Ks resources. RB ,(*) H This indicates the conjugate transpose.

[0397] As another example, both sub-channel parameters and sub-reference channel parameters are information from domains other than the frequency domain.

[0398] For example, taking the frequency domain in the above "as an example" as the first frequency domain, the "other domains" in this example can also be called the second frequency domain. Specifically, the information in the second frequency domain can be obtained by performing DFT or IDFT on the information in the aforementioned first frequency domain. Alternatively, the second frequency domain can be the time domain, in which case, in this example, both the sub-channel parameters and the sub-reference channel parameters are time-domain information. The following description uses the second frequency domain as the time domain as an example.

[0399] Optionally, when the sub-channel parameter is time-domain information, the sub-channel parameter is used to indicate (or characterize / represent) the time-domain channel information corresponding to one of the N frequency points corresponding to an antenna port included in the p-th port group. That is, the nth sub-channel parameter among the N p-th sub-channel parameters is used to indicate (or characterize / represent) the time-domain channel information corresponding to the nth frequency point among the N frequency points corresponding to the i-th antenna port in the p-th port group. Alternatively, the nth sub-channel parameter among the N p-th sub-channel parameters is used to indicate (or characterize / represent) the nth time-domain channel information among the N time-domain channel information corresponding to the i-th antenna port in the p-th port group; wherein the N time-domain channel information corresponds to each of the N p-th sub-channel parameters, and the N frequency points correspond to each of the N time-domain channel information.

[0400] For example, the time-domain channel information (or, in other words, the time-domain channel information) corresponding to a frequency point can be understood as follows: after determining the channel information corresponding to the frequency point, the channel information can be converted into time-domain information, which is the time-domain channel information. For example, the sub-channel parameter corresponding to the nth frequency point of the i-th antenna port in the p-th port group is h′ in the above relation (15a-1) or relation (15a-2). #p,i (n), or h′ in relation (15b-1) or relation (15b-2) #p,i (f). Furthermore, it can be converted into time-domain channel information. Specifically, h′ #p,i (n) or h′ #p,i (f) The realization of converting channel information into the time domain, and the relationship (13) above, where h′ #p,i The implementation of converting (n) into its corresponding time-domain channel information is similar. For details, please refer to the relevant description of the above relationship (13), which will not be repeated here.

[0401] Similarly, when the sub-reference channel parameters are time-domain information, the sub-reference channel is used to indicate (or characterize / represent) the time-domain channel information corresponding to one of the N frequency points corresponding to an antenna port in the reference port group. That is, the nth sub-reference channel parameter among the N sub-reference channel parameters is used to indicate (or characterize / represent) the time-domain channel information corresponding to the nth frequency point among the N frequency points corresponding to the i-th antenna port in the reference port group.

[0402] The time-domain channel information (or, in other words, time-domain channel information) corresponding to a frequency point can be understood as follows: after determining the channel information corresponding to a frequency point, this channel information can be converted into time-domain information, which is the time-domain channel information. For example, the sub-reference channel parameter corresponding to the nth frequency point of the i-th antenna port in the p-th port group can be h′ in the above relation (15a-1) or relation (15a-2). #p,i (n), or h′ in relation (15b-1) or relation (15b-2) #p,i (f). Furthermore, it can be converted into time-domain channel information. Specifically, h′ #s,i (n) or h′ #s,i (f) The realization of converting channel information into the time domain, and the relationship (13) above, where h′ #p,i The implementation of converting (n) into its corresponding time-domain channel information is similar. For details, please refer to the relevant description of the above relationship (13), which will not be repeated here.

[0403] Alternatively, the nth sub-reference channel parameter among the N sub-reference channel parameters is used to indicate (or characterize / represent): the nth time-domain channel information among the N time-domain channel information corresponding to the i-th antenna port in the reference port group; wherein, the N time-domain channel information corresponds to the N p-th sub-channel parameters respectively, and the N frequency points correspond to the N time-domain channel information respectively.

[0404] Specifically, the channel correlation parameters of the i-th group (i.e., the channel correlation characteristics corresponding to the i-th antenna port in the p-th port group), the N sub-channel parameters corresponding to the i-th antenna port in the p-th port group (i.e., the N p-th sub-channel parameters), and the N sub-reference channel parameters corresponding to the i-th antenna port in the reference port group can satisfy the following relationship (16a-1) or relationship (16a-2), that is, the above relationship (15a-1) can be replaced by the following relationship (16a-1), and the relationship (15a-2) can be replaced by the following relationship (16a-2):

[0405] Where, d′ p,i For the channel correlation parameters of the i-th group (i.e., the channel correlation characteristics corresponding to the i-th antenna port in the p-th port group), h″ #s,i (n) represents the time-domain sub-reference channel parameter corresponding to the nth frequency point among the N frequency points corresponding to the i-th antenna port in the reference port group, h″ #p,i (t) represents the time-domain sub-channel parameter corresponding to the nth frequency point among the N frequency points corresponding to the i-th antenna port in the p-th port group; i = 0, 1, ..., I-1; p = 0, 1, ..., P-1, n = 0, 1, ..., N RB -1, N RBLet N = N_s be the number of RBs or subbands in the bandwidth belonging to the Ks resources. RB ,(*) H This indicates the conjugate transpose.

[0406] Since N is the number of time-domain parameters corresponding to the frequency points of the frequency-domain resources in the Ks resources, that is, n is the index of the time-domain parameter corresponding to any one of the N frequency points (i.e., the index of any one of the N time-domain parameters); therefore, in this example, n can also be replaced by t. That is, in this example, n and t are the same and can be substituted for each other, both representing the index of the time-domain parameter corresponding to any one of the N frequency points. At this time, the above relation (16a-1) is replaced by the following relation (16b-1), and relation (16a-2) is replaced by the following relation (16b-2):

[0407] Where, d′ p,i For the channel correlation parameters of the i-th group (i.e., the channel correlation characteristics corresponding to the i-th antenna port in the p-th port group), h″ #s,i (t) represents the time-domain sub-reference channel parameter corresponding to the t-th frequency point (i.e., the n-th frequency point) among the N frequency points corresponding to the i-th antenna port in the reference port group, h″ #p,i (t) represents the time-domain sub-channel parameter corresponding to the t-th frequency point (i.e., the n-th frequency point) among the N frequency points corresponding to the i-th antenna port in the p-th port group; i = 0, 1, ..., I-1; p = 0, 1, ..., P-1, t = 0, 1, ..., N RB -1, N RB Let N = N_s be the number of RBs or subbands in the bandwidth belonging to the Ks resources. RB ,(*) H This indicates the conjugate transpose.

[0408] For example, the implementation of the terminal device reporting the channel association characteristics of the P groups in Case 2 is similar to that in Case 1 above, and you can refer to the relevant description in Case 1 above for details. For example, the terminal device can determine the channel association parameters (i.e., the channel association parameters of the i-th group, such as d) corresponding to each antenna port in the P port groups based on any one of the above relationships (15a-1), (15a-2), (15b-1), (15b-2), (16a-1), (16a-2), (16b-1), or (16b-2). p,i Furthermore, based on the I sets of channel association parameters corresponding to the I antenna ports in the P port groups, the channel association characteristics corresponding to each port group (or each resource in the P resources) are determined. That is, the I sets of channel association parameters are concatenated to form the channel association characteristic.

[0409] Case 3: N is one segment among N segments within a preset segmentation.

[0410] Optionally, the value of N can be determined based on the capability information of the terminal device.

[0411] Optionally, the value of N can be specified by the network device. Specifically, the value of N is less than or equal to the maximum value supported by the terminal device's capabilities.

[0412] Optionally, in this third case, the sub-channel parameter is used to indicate (or characterize / represent) the channel information corresponding to one of the N segments corresponding to an antenna port in the p-th port group. That is, the nth sub-channel parameter among the N p-th sub-channel parameters is used to indicate (or characterize / represent) the channel information corresponding to the nth segment among the N segments corresponding to the i-th antenna port in the p-th port group.

[0413] Similarly, a sub-reference channel is used to indicate (or characterize / represent) the channel information corresponding to one of the N segments corresponding to an antenna port in the reference port group. That is, the nth sub-reference channel parameter among the N sub-reference channel parameters is used to indicate (or characterize / represent) the channel information corresponding to the nth segment among the N segments corresponding to the i-th antenna port in the reference port group.

[0414] Therefore, the sub-channel association parameter is used to indicate (or characterize / represent) the information difference between the channel information (i.e., sub-channel parameter) corresponding to the nth segment of the i-th antenna port in the p-th port group and the channel information (i.e., sub-reference channel parameter) corresponding to the nth segment of the i-th antenna port in the reference port group.

[0415] Specifically, based on different implementations of the preset segmentation, the nth group of sub-channel association parameters can include the following two possible implementations:

[0416] As a first possible implementation, the preset segmentation is the frequency band corresponding to the frequency domain resources contained in any one of the Ks resources. That is, the frequency bands corresponding to the frequency domain resources contained in each of the Ks resources are the same.

[0417] For example, the latency of the frequency domain resources contained in each of the P resources is equal to the frequency band of the preset segment; that is, the frequency bands of the frequency domain resources contained in each of the P resources are all the same.

[0418] Optionally, in this possible implementation, the nth group of sub-channel association parameters is used to indicate (or characterize / represent) the information difference between the channel information (i.e., sub-channel parameters) corresponding to the nth frequency band of the i-th antenna port in the p-th port group and the channel information (i.e., sub-reference channel parameters) corresponding to the nth frequency band of the i-th antenna port in the reference port group.

[0419] Specifically, since N is the number of segments in the preset frequency band, that is, n is any one of the N frequency bands; therefore, in this possible implementation, n can also be replaced by f. In other words, in this possible implementation, n and f are the same and can be substituted for each other, both representing any one of the N frequency bands.

[0420] At this point, the sub-channel correlation parameters of the nth group (or, also called: the sub-channel correlation parameters of the fth group, i.e., the channel correlation characteristics corresponding to the fth frequency band (i.e., the nth frequency band) among the N frequency bands corresponding to the i-th antenna port in the p-th port group), the sub-channel parameters corresponding to the nth frequency band among the N frequency bands corresponding to the i-th antenna port in the p-th port group, and the sub-reference channel parameters corresponding to the nth frequency band among the N frequency bands corresponding to the i-th antenna port in the reference port group can satisfy the following relationship (17a) or relationship (17b):

[0421] Among them, f n For the nth frequency band out of N frequency bands, d p,i (n) represents the correlation parameters of the nth sub-channel, h′ #s,i (f) represents the sub-reference channel parameters corresponding to the nth frequency band among the N frequency bands corresponding to the i-th antenna port in the reference port group, h′ #p,i (f) represents the sub-channel parameters corresponding to the nth frequency band among the N frequency bands corresponding to the i-th antenna port in the p-th port group, where i = 0, 1, ..., I-1; p = 0, 1, ..., P-1; f = 0, 1, ..., N RB -1, N RB Let N = N_s be the number of RBs or subbands in the bandwidth belonging to the Ks resources. RB ,(*) H This indicates the conjugate transpose.

[0422] As a second possible implementation, the preset segmentation is the latency corresponding to the time-domain resources contained in any one of the Ks resources. That is, the latency corresponding to the latency resources contained in each of the Ks resources is the same.

[0423] For example, the latency corresponding to the time-domain resources contained in each of the P resources is equal to the latency corresponding to the preset segment; that is, the latency corresponding to the time-domain resources contained in each of the P resources is the same. The latency corresponding to the preset segment can be called the first latency, that is, the first latency includes N time periods.

[0424] Optionally, the start and / or end positions of each of the N time periods can be indicated by the network device. For example, the network device can indicate the start position of one or more time periods in the N time periods, or the base station can indicate the end position of one or more time periods in the N time periods, or the network device can indicate the dividing point between two adjacent time periods in the N time periods.

[0425] For example, the start position of the preset segment is t=0 and the end position is t=N. RB -1, N time periods can be [t0,t1-1], [t1,t2-1], [t2,t3-1], ..., [t N-1 N RB -1], where t0=0, N RN This represents the number of RBs or subbands within the bandwidth belonging to the Ks resources. Specifically, N can be any positive integer greater than or equal to 1, such as 1, 2, 3, 4, etc. When N=1, there is no time period distinction.

[0426] Optionally, in this possible implementation, the nth group of sub-channel association parameters is used to indicate (or characterize / represent) the information difference between the channel information (i.e., sub-channel parameters) corresponding to the nth time period corresponding to the i-th antenna port in the p-th port group and the channel information (i.e., sub-reference channel parameters) corresponding to the nth time period corresponding to the i-th antenna port in the reference port group.

[0427] Similarly, a sub-reference channel is used to indicate (or characterize / represent) the channel information corresponding to one of the N time periods corresponding to an antenna port in the reference port group. That is, the nth sub-reference channel parameter among the N sub-reference channel parameters is used to indicate (or characterize / represent) the channel information corresponding to the nth time period among the N time periods corresponding to the i-th antenna port in the reference port group.

[0428] Therefore, the sub-channel association parameter is used to indicate (or characterize / represent) the information difference between the channel information (i.e., sub-channel parameter) corresponding to the nth time period corresponding to the i-th antenna port in the p-th port group and the channel information (i.e., sub-reference channel parameter) corresponding to the nth time period corresponding to the i-th antenna port in the reference port group.

[0429] Specifically, since N is the number of segments in the preset frequency band, i.e., n is any one of the N time periods; therefore, in this possible implementation, n can also be replaced by t. That is to say, in this possible implementation, n and t are the same and can be interchanged, both representing any one of the N time periods. At this time, the sub-channel correlation parameters of the nth group (or, can also be called: the sub-channel correlation parameters of the tth group, i.e., the channel correlation characteristics corresponding to the tth time period (i.e., the nth time period) of the N time periods corresponding to the i-th antenna port in the p-th port group), the sub-channel parameters corresponding to the tth time period (i.e., the nth time period) of the N time periods corresponding to the i-th antenna port in the p-th port group, and the sub-reference channel parameters corresponding to the tth frequency band of the N frequency bands corresponding to the i-th antenna port in the reference port group can satisfy the following relationship (18a) or relationship (18b):

[0430] Among them, t n For the nth time period out of N time periods, d p,i (n) represents the correlation parameters of the nth sub-channel, h″ #s,i (t) represents the sub-reference channel parameters corresponding to the nth time period out of the N time periods corresponding to the i-th antenna port in the reference port group, h″ #p,i (t) represents the sub-channel parameter corresponding to the nth time period in the N time periods corresponding to the i-th antenna port in the p-th port group, i = 0, 1, ..., I-1; p = 0, 1, ..., P-1; t = 0, 1, ..., N RB -1, N RB Let N = N_s be the number of RBs or subbands in the bandwidth belonging to the Ks resources. RB ,(*) H This indicates the conjugate transpose.

[0431] For example, the implementation of the P-group channel association characteristics reported by the terminal device in Case 3 is similar to that in Case 1 above, and the relevant description in Case 1 can be found for details. For instance, the terminal device can determine any one of the N groups of sub-channel association parameters (i.e., the nth group of sub-channel association parameters, such as d) for each antenna port in the P port groups based on the above relationships (17a), (17b), (18a), or (18b). p,i (n)); thus determining the channel association parameters (i.e., the i-th group of channel association parameters) corresponding to each antenna port in the P port groups, that is, concatenating the N groups of sub-channel association parameters into the channel association parameter. Further, based on the I groups of channel association parameters corresponding to the I antenna ports in the P port groups, determining the channel association characteristics corresponding to each port group (or each resource in the P resources) in the P port groups. That is, concatenating the I groups of channel association parameters into the channel association characteristics.

[0432] Case 4: N represents the N time points within the preset segment's time delay. The time delay corresponding to the preset segment is the time delay of the time-domain resources contained in any one of the Ks resources. That is, the time delay corresponding to the time-domain resources contained in each of the Ks resources is the same.

[0433] For example, the implementation of the delay and N value corresponding to the preset segment is the same as the implementation of the delay and N value corresponding to the preset segment in Case 3 above. For details, please refer to the relevant description in Case 3 above, which will not be repeated here.

[0434] Optionally, in this fourth case, the sub-channel parameter is used to indicate (or characterize / represent) the channel information corresponding to one of the N time moments corresponding to an antenna port included in the p-th port group. That is, the nth sub-channel parameter among the N p-th sub-channel parameters is used to indicate (or characterize / represent) the channel information corresponding to the nth time moment among the N time moments corresponding to the i-th antenna port in the p-th port group.

[0435] Similarly, a sub-reference channel is used to indicate (or characterize / represent) the channel information corresponding to one of the N time points corresponding to an antenna port in the reference port group. That is, the nth sub-reference channel parameter among the N sub-reference channel parameters is used to indicate (or characterize / represent) the channel information corresponding to the nth time point among the N time points corresponding to the i-th antenna port in the reference port group.

[0436] Therefore, the sub-channel correlation parameter is used to indicate (or characterize / represent) the information difference between the channel information (i.e., sub-channel parameter) corresponding to the i-th antenna port in the p-th port group at the n-th time and the channel information (i.e., sub-reference channel parameter) corresponding to the i-th antenna port in the reference port group at the n-th time.

[0437] Specifically, the sub-channel correlation parameters of the nth group (i.e., the channel correlation characteristics corresponding to the nth time among the N times corresponding to the i-th antenna port in the p-th port group), the sub-channel parameters corresponding to the nth time among the N times corresponding to the i-th antenna port in the p-th port group, and the sub-reference channel parameters corresponding to the nth time among the N times corresponding to the i-th antenna port in the reference port group can satisfy the following relationship (19a):

[0438] Where, d p,i (n) represents the correlation parameters of the nth sub-channel (i.e., the channel correlation characteristics corresponding to the nth time among the N time points corresponding to the i-th antenna port in the p-th port group), h′ #s,i(n) represents the sub-reference channel parameters corresponding to the nth time among the N time points corresponding to the i-th antenna port in the reference port group, h′ #p,i (n) represents the sub-channel parameters corresponding to the nth time among N time points corresponding to the i-th antenna port in the p-th port group, i = 0, 1, ..., I-1; p = 0, 1, ..., P-1, (*) H This indicates the conjugate transpose.

[0439] Since N represents N times within the preset time delay, i.e., n is any one of the N times, n can also be replaced by t. That is, n and t are the same and can be interchanged, both representing any one of the N times. In this case, relation (19a) can be replaced by the following relation (19b):

[0440] Where, d p,i (t) represents the correlation parameters of the t-th sub-channel (i.e., the correlation parameters of the n-th sub-channel), h′ #s,i (t) represents the sub-reference channel parameters corresponding to the t-th time (i.e., the n-th time) among the N time points corresponding to the i-th antenna port in the reference port group, h′ #p,i (t) represents the sub-channel parameter corresponding to the t-th time (i.e., the n-th time) among the N time points corresponding to the i-th antenna port in the p-th port group, where i = 0, 1, ..., I-1; p = 0, 1, ..., P-1, (*) H This indicates the conjugate transpose.

[0441] For example, the implementation of the terminal device reporting the P-group channel association characteristics in scenario four is similar to that in scenario one above, and the relevant description in scenario one can be found for details. For instance, the terminal device can determine any one of the N groups of sub-channel association parameters (i.e., the nth group of sub-channel association parameters, such as d) for each antenna port in the P port groups based on the above relationship (19a) or relationship (19b). p,i (n) or d p,i (t)); thus determining the channel association parameters (i.e., the i-th group of channel association parameters) corresponding to each antenna port in the P port groups, that is, concatenating the N groups of sub-channel association parameters into the channel association parameter. Further, based on the I groups of channel association parameters corresponding to the I antenna ports in the P port groups, determining the channel association characteristics corresponding to each port group (or each resource in the P resources) in the P port groups. That is, concatenating the I groups of channel association parameters into the channel association characteristics.

[0442] Combining the above four scenarios, optionally, after the terminal device determines the N sets of sub-channel association parameters corresponding to each antenna port in the P port groups (i.e., the sub-channel association parameters corresponding to the i-th antenna port in the p-th port group determined based on scenarios one to three above), or after determining the channel association parameters corresponding to each antenna port in the P port groups (i.e., the channel association parameters corresponding to the i-th antenna port in the p-th port group determined based on scenario four above), it can quantize each sub-channel association parameter (or each channel association parameter) and then report the quantization results to the network device.

[0443] As described above, the channel correlation characteristics in each of the P groups of channel correlation characteristics indicated by the second indication information in step S1002 include: channel correlation parameters corresponding to the I antenna ports in one of the P port groups. Therefore, based on the above cases one to three, the second indication information may include the quantization parameters corresponding to each of the N groups of sub-channel correlation parameters corresponding to each of the I antenna ports; such as the amplitude and phase of each sub-channel correlation parameter.

[0444] Alternatively, based on scenario four above, the second indication information may include the quantization parameters corresponding to each of the I sets of channel association parameters for each of the I antenna ports, such as the amplitude and phase of each set of sub-channel association parameters.

[0445] For example, the second indication information can represent the amplitude of the I*N sub-channel correlation parameters (or I*N group channel correlation parameters) included in each of the P group channel correlation characteristics using 4 bits or 6 bits. The second indication information can represent the phase of the I*N group sub-channel correlation parameters (or I group channel correlation parameters) included in each of the P group channel correlation characteristics using 4 bits or 3 bits.

[0446] Therefore, after receiving the second indication information, the network device can recover P channel information based on the corresponding formulas in the four cases mentioned above. If the terminal device determines the second indication information based on case one, the network device can determine the sub-channel parameters (i.e., N p-th sub-channel parameters) corresponding to the I antenna ports included in one of the P port groups based on the formula in case one, and then determine the channel parameters corresponding to a port group, thereby obtaining the P channel information corresponding to the P port groups.

[0447] For example, the implementation of determining the channel parameters corresponding to a port group based on the sub-channel parameters corresponding to an antenna port, and then determining the P channel information corresponding to P port groups, can be found in the relevant description of the above embodiments, and will not be repeated here.

[0448] Optionally, the nth p-th sub-channel parameter among the N p-th sub-channel parameters corresponding to the i-th antenna port in the p-th port group satisfies the first condition. The first condition is related to the first threshold.

[0449] For example, the first condition satisfies one or more of the following, or in other words, the nth pth sub-channel parameter and the first threshold satisfy one or more of the following relationships:

[0450] (i) The difference between the first received power and the second received power is less than or equal to the first threshold; wherein, the first received power is the received power corresponding to the nth pth sub-channel parameter in the pth channel information, and the second received power is the received power corresponding to the maximum sub-channel parameter corresponding to the ith antenna port in the pth port group.

[0451] For example, the received power corresponding to the nth p-th sub-channel parameter in the p-th channel information can be understood as: the received power corresponding to the nth p-th sub-channel parameter among the N p-th sub-channel parameters corresponding to the i-th antenna port in the p-th port group. Correspondingly, the received power corresponding to the maximum sub-channel parameter corresponding to the i-th antenna port in the p-th port group can be understood as: the received power corresponding to the maximum sub-channel parameter among the N p-th sub-channel parameters corresponding to the i-th antenna port in the p-th port group.

[0452] Let the nth p-th sub-channel parameter corresponding to the i-th antenna port in the p-th port group be ||h′ #p,i (n)||or||h″ #p,i (n)||, the maximum subchannel parameter corresponding to the i-th antenna port in the p-th port group is (n)||, or For example, thus, ||h′ #p,i (n)|| The corresponding received power (i.e., the first received power) and The difference between the corresponding received powers (i.e., the second received power) is less than or equal to the first threshold; or, ||h″ #p,i (n)|| The corresponding received power (i.e., the first received power) and The difference between the corresponding received power (i.e., the second received power) is less than or equal to the first threshold.

[0453] Specifically, the first threshold can be any one of 10 dB, 12 dB, 14 dB, 16 dB, 18 dB, 20 dB, and 21 dB, or the first threshold can be any other implementation besides the examples above, which is not limited in this application.

[0454] (ii) The ratio between the nth sub-channel parameter in the pth channel information and the maximum sub-channel parameter corresponding to the i-th antenna port in the p-th port group is less than or equal to the first threshold.

[0455] Specifically, the nth sub-channel parameter in the pth channel information, the maximum sub-channel parameter corresponding to the i-th antenna port in the p-th port group, and the first threshold satisfy the following relationship (20):

[0456] or,

[0457] Among them, ||h′ #p,i (n)||or||h″ #p,i (n)|| represents the nth p-th sub-channel parameter corresponding to the i-th antenna port in the p-th port group; or is the maximum subchannel parameter corresponding to the i-th antenna port in the p-th port group; Thre is the first threshold.

[0458] Specifically, the first threshold can be any one of 1 / 10, 1 / 20, 1 / 16, 1 / 32, 1 / 4, or 1 / 128. Alternatively, the first threshold can be any other implementation besides the examples above, which is not limited in this application.

[0459] (iii) The difference between the first received power and the third received power is less than or equal to the first threshold; wherein, the third received power is the received power corresponding to the maximum sub-channel parameter of the i-th antenna port in the reference port group.

[0460] For example, the received power corresponding to the maximum sub-channel parameter of the i-th antenna port in the reference port group can be understood as: the received power corresponding to the maximum sub-reference channel parameter among the N sub-reference channel parameters corresponding to the i-th antenna port in the reference port group.

[0461] Let the nth p-th sub-channel parameter corresponding to the i-th antenna port in the p-th port group be ||h′ #p,i (n)||or||h″ #p,i (n)||, where the maximum subchannel parameter corresponding to the i-th antenna port in the reference port group is (n)||. or For example, thus, ||h′ #p,i (n)|| The corresponding received power (i.e., the first received power) and The difference between the corresponding received powers (i.e., the third received power) is less than or equal to the first threshold; or, ||h″ #p,i (n)|| The corresponding received power (i.e., the first received power) and The difference between the corresponding received power (i.e., the third received power) is less than or equal to the first threshold.

[0462] Specifically, the implementation of the first threshold can be found in the relevant description in (I) above, or it can be other implementations besides the examples in (I) above, which are not limited in this application.

[0463] (iv) The difference between the first received power and the fourth received power is less than or equal to the first threshold; wherein, the fourth received power is the received power corresponding to the largest sub-channel parameter among the (P+1)*I antenna ports in the P+1 port group; the P+1 port group includes the port group corresponding to P resources (or P channel information) respectively, and the reference port group.

[0464] For example, since the P+1 port groups include port groups corresponding to P resources (or P channel information) and a reference port group, the (P+1) sub-channel parameters corresponding to the (P+1)*I antenna ports can be understood as:

[0465] Each antenna port in each of the P port groups corresponds to a sub-channel parameter, resulting in P*I sub-channel parameters. In addition, each antenna port in each of the reference port groups corresponds to a sub-reference channel parameter. Therefore, the P port groups and the reference port groups together correspond to (P+1) sub-channel parameters (i.e., P*I sub-channel parameters and P sub-reference channel parameters).

[0466] Specifically, the parameter of the nth p-th sub-channel corresponding to the i-th antenna port in the p-th port group is ||h′ #p,i (n)||or||h″ #p,i (n)||, the largest sub-channel parameter among the (P+1)*I antenna ports in the P+1 port group is (P+1)||, or For example, thus, ||h′ #p,i (n)|| The corresponding received power (i.e., the first received power) and The difference between the corresponding received powers (i.e., the fourth received power) is less than or equal to the first threshold; or, ||h″ #p,i (n)|| The corresponding received power (i.e., the first received power) and The difference between the corresponding received power (i.e., the fourth received power) is less than or equal to the first threshold.

[0467] Specifically, the implementation of the first threshold can be found in the relevant description in (I) above, or it can be other implementations besides the examples in (I) above, which are not limited in this application.

[0468] (v) The ratio between the nth sub-channel parameter in the pth channel information and the maximum sub-channel parameter among the (P+1) sub-channel parameters corresponding to the (P+1)*I antenna ports in the P+1 port group is less than or equal to the first threshold.

[0469] Specifically, the nth sub-channel parameter in the pth channel information, the maximum sub-channel parameter among the (P+1)*I sub-channel parameters corresponding to the (P+1) antenna ports in the P+1 port group, and the first threshold satisfy the following relationship (21):

[0470] or,

[0471] Among them, ||h′ #p,i (n)||or||h″ #p,i (n)|| represents the nth p-th sub-channel parameter corresponding to the i-th antenna port in the p-th port group; or Thre is the maximum sub-channel parameter among the (P+1)*I antenna ports in the P+1 port group; Thre is the first threshold.

[0472] Specifically, the implementation of the first threshold can be found in the relevant description in (II) above, or it can be other implementations besides the examples in (II) above, which are not limited in this application.

[0473] Combining the above (i) to (v), the first threshold can be indicated by the network device to the terminal device. Specifically, before step S1002, the communication method for channel feedback may include step S1008:

[0474] S1008, the network device sends a fifth indication message to the terminal device; correspondingly, the terminal device receives the fifth indication message from the network device. The fifth indication message is used to indicate the first threshold.

[0475] For example, after receiving the fifth indication information, the terminal device can determine the nth p-th sub-channel parameter corresponding to the i-th antenna port in the p-th port group among the P channel information based on the indication of the fifth indication information; that is, the terminal device can determine the P channel information based on the first threshold.

[0476] Optionally, the fifth indication information may include the first threshold; or, the fifth indication information may also include any other parameter that corresponds to the first threshold, so that the terminal device can determine the first threshold based on the parameter indicated by the fifth indication information.

[0477] For example, the terminal device and the network device can pre-agree on multiple values ​​(such as through a protocol pre-definition, or the terminal device or the network device determines and sends them to each other); thus, the fifth indication information can indicate one of the multiple values ​​(such as the number, index, or location corresponding to that value).

[0478] In some implementations, the aforementioned channel correlation characteristics can also be understood as time-domain channel properties (TDCP). In this case, the i-th group of channel correlation parameters described in the above four cases is the TDCP corresponding to the i-th antenna port in the p-th port group.

[0479] For example, the TDCP corresponding to the i-th antenna port can be implemented based on the following four scenarios:

[0480] Scenario 1: N represents the N time periods within a preset segment. The preset segment is the latency corresponding to the time-domain resources contained in any one of the Ks resources. That is, the latency corresponding to the latency resources contained in each of the Ks resources is the same.

[0481] Optionally, the latency corresponding to the time-domain resources contained in each of the P resources is also the latency corresponding to the preset segment; that is, the latency corresponding to the time-domain resources contained in each of the P resources is the same.

[0482] Optionally, the subchannel association parameters are used to indicate (or characterize / represent) the TDCP between the channel information (i.e., subchannel parameters) corresponding to the nth time period of the i-th antenna port in the p-th port group and the channel information (i.e., subreference channel parameters) corresponding to the nth time period of the i-th antenna port in the reference port group.

[0483] For example, the implementation of the preset segmentation corresponding to the time delay, the value of N, the sub-channel parameters, and the sub-reference channel parameters is the same as that in Case 3 above. For details, please refer to the relevant description in Case 3 above, which will not be repeated here.

[0484] Specifically, the sub-channel correlation parameters of the nth group (i.e., the channel correlation characteristics corresponding to the nth time period among the N time periods corresponding to the i-th antenna port in the p-th port group), the sub-channel parameters corresponding to the nth time period among the N time periods corresponding to the i-th antenna port in the p-th port group, and the sub-reference channel parameters corresponding to the nth time period among the N time periods corresponding to the i-th antenna port in the reference port group can satisfy the following relationship (22a) or relationship (22b). That is to say, the above relationship (18a) or relationship (18b) can be replaced by the following relationship (22a) or relationship (22b):

[0485] Among them, tn For the nth time period out of N time periods, d p,i (n) represents the correlation parameters of the nth sub-channel, h″ #s,i (t) represents the sub-reference channel parameters corresponding to the nth time period out of the N time periods corresponding to the i-th antenna port in the reference port group, h″ #p,i Let t be the sub-channel parameter corresponding to the nth time period out of N time periods corresponding to the i-th antenna port in the p-th port group, where i = 0, 1, ..., I-1; p = 0, 1, ..., P-1; t = 0, 1, ..., N RB -1, N RB Let N = N_s be the number of RBs or subbands in the bandwidth belonging to the Ks resources. RB ,(*) H This indicates the conjugate transpose.

[0486] For example, the implementation of each parameter in Scenario 1 can refer to the relevant description in Scenario 3 above, and will not be repeated here.

[0487] Scenario 2: N represents the N time points within the preset segment's latency. The latency corresponding to the preset segment is the latency of the time-domain resources contained in any one of the Ks resources. That is, the latency of the time-domain resources contained in each of the Ks resources is the same.

[0488] Optionally, the subchannel association parameters are used to indicate (or characterize / represent) the TDCP between the channel information (i.e., subchannel parameters) corresponding to the i-th antenna port in the p-th port group at the n-th time and the channel information (i.e., subreference channel parameters) corresponding to the i-th antenna port in the reference port group at the n-th time.

[0489] For example, the implementation of the preset segmentation corresponding to the time delay, the value of N, the sub-channel parameters, and the sub-reference channel parameters is the same as that in Case 4 above. For details, please refer to the relevant description in Case 4 above, which will not be repeated here.

[0490] Specifically, the sub-channel correlation parameters of the nth group (i.e., the channel correlation characteristics corresponding to the nth time among the N times corresponding to the i-th antenna port in the p-th port group), the sub-channel parameters corresponding to the nth time among the N times corresponding to the i-th antenna port in the p-th port group, and the sub-reference channel parameters corresponding to the nth time among the N times corresponding to the i-th antenna port in the reference port group can satisfy the following relationship (23). That is, the above relationship (19a) or relationship (19b) can be replaced by the following relationship (23):

[0491] The implementation of each parameter in relation (23) can be found in the relevant descriptions in relation (19a) or relation (19b) above, and will not be repeated here.

[0492] It should be understood that, based on Figure 2(b) above, network devices can be divided into three parts: RU, CU, and DU; therefore, the “network device sends XX information” and / or “network device receives XX information” mentioned in Figures 10 to 12 above can be understood as: “RU sends XX information” and / or “RU receives XX information”.

[0493] For example, the interaction between the terminal device and the network device in Figure 10 above can be replaced by the interaction between the terminal device and the RU as shown in Figure 13 below:

[0494] Step S1001 can be replaced by step S1001A: RU sends first indication information to terminal device; correspondingly, terminal device receives first indication information from RU.

[0495] For example, the implementation of the first instruction information can refer to the relevant description of the first instruction information in step S1001 above, and will not be repeated here.

[0496] Step S1002 can be replaced by step S1002A: The terminal device sends the second indication information to the RU, and the RU receives the second indication information from the terminal device accordingly.

[0497] For example, the implementation of the second instruction information can refer to the relevant description of the second instruction information in step S1002 above, and will not be repeated here.

[0498] Step S1003 can be replaced by step S1003A: DU / CU determines P channel information based on the P group channel association characteristics and reference channel information.

[0499] For example, the implementation of the P-group channel association characteristics, reference channel information, and P channel information can refer to the relevant description in step S1003 above, and will not be repeated here.

[0500] It should be understood that the above embodiments use the communication method for channel feedback described in Figure 10 as an example to introduce the interaction between the terminal device and the RU; in fact, the communication method for channel feedback described in Figure 11 and / or Figure 12 can also be replaced by the interaction between the terminal device and the RU. For specific implementation, please refer to the relevant description in Figure 13 above, which will not be repeated here.

[0501] It should be noted that the various embodiments of this application can be implemented independently or in combination, without limitation. Unless otherwise specified or in conflict, the terminology and / or descriptions between the different embodiments provided in this application are consistent and can be referenced mutually. Technical features in different embodiments can be combined to form new embodiments based on their inherent logical relationships.

[0502] The foregoing primarily describes the solutions provided in this application from the perspective of device-to-device interaction. It is understood that each device, in order to achieve the aforementioned functions, includes corresponding hardware structures and / or software modules for executing each function. Those skilled in the art should readily recognize that, based on the algorithm steps of the examples described in conjunction with the embodiments disclosed herein, this application can be implemented in hardware or a combination of hardware and computer software. Whether a function is executed in hardware or by computer software driving hardware depends on the specific application and design constraints of the technical solution. Those skilled in the art can use different methods to implement the described functions for each specific application, but such implementation should not be considered beyond the scope of this application.

[0503] It is understood that, in order to achieve the aforementioned functions, the communication device includes hardware structures and / or software modules corresponding to the execution of each function. Those skilled in the art should readily recognize that, based on the units and algorithm steps of the examples described in conjunction with the embodiments disclosed herein, this application can be implemented in hardware or a combination of hardware and computer software. Whether a function is executed in hardware or by computer software driving hardware depends on the specific application and design constraints of the technical solution. Those skilled in the art can use different methods to implement the described functions for each specific application, but such implementation should not be considered beyond the scope of this application.

[0504] This application embodiment can divide each device into functional modules according to the above method example. For example, each function can be divided into a separate functional module, or two or more functions can be integrated into one processing module. The integrated module can be implemented in hardware or as a software functional module. It should be noted that the module division in this application embodiment is illustrative and only represents one logical functional division. In actual implementation, there may be other division methods.

[0505] Figure 14 shows a schematic diagram of a communication device 1400. The communication device 1400 includes a processing module 1401 and a transceiver module 1402. This communication device can be used to implement the functions of the aforementioned terminal equipment or network equipment.

[0506] In some embodiments, the communication device 1400 may further include a storage module (not shown in FIG14) for storing programs, instructions and / or data.

[0507] In some embodiments, the transceiver module 1402, also referred to as a transceiver unit, is used to implement sending and / or receiving functions. The transceiver module 1402 may consist of a transceiver circuit, a transceiver, a transceiver unit, or a communication interface.

[0508] In some embodiments, the transceiver module 1402 may include a receiving module and a sending module, respectively configured to perform receiving and sending steps performed by the terminal device or network device in the above method embodiments, and / or other processes to support the technology described herein; the processing module 1401 may be configured to perform processing steps (e.g., determining) performed by the terminal device or network device in the above method embodiments, and / or other processes to support the technology described herein.

[0509] When the communication device 1400 is used to implement the functions of the aforementioned terminal equipment:

[0510] In some embodiments, the transceiver module 1402 is configured to receive first indication information, which indicates reference resources. The transceiver module 1402 is also configured to send second indication information, which indicates P groups of channel association characteristics, where P is a positive integer greater than 1. The p-th group of channel association characteristics indicates the information difference between the p-th channel information and the reference channel information, where p = 0, 1, ..., P-1. The p-th group of channel association characteristics is a set of channel association characteristics among the P groups of channel association characteristics, the p-th channel information is one of the P channel information, the P channel information is determined based on Ks resources, the Ks resources include reference resources, the reference channel information is the channel information corresponding to the reference resources, and Ks is a positive integer greater than 1.

[0511] Optionally, the transceiver module 1402 is also used to transmit an uplink reference signal, which is used to determine reference channel information.

[0512] Optionally, the transceiver module 1402 is also used to send third indication information, which is used to indicate reference channel information.

[0513] Optionally, the transceiver module 1402 is also used to receive fourth indication information, which is used to indicate Ks resources.

[0514] Optionally, the transceiver module 1402 is also used to receive fifth indication information, which is used to indicate a first threshold, and the first threshold is used to determine P channel information.

[0515] When the communication device 1400 is used to implement the functions of the aforementioned network equipment:

[0516] In some embodiments, the transceiver module 1402 is configured to transmit first indication information, which indicates a reference resource; the transceiver module 1402 is also configured to receive second indication information, which indicates P groups of channel association characteristics, where P is a positive integer greater than 1; obtain reference channel information, which is the channel information corresponding to the reference resource; and the processing module 1401 is configured to determine P channel information based on the P groups of channel association characteristics and the reference channel information, where the p-th group of channel association characteristics indicates the information difference between the p-th channel information and the reference channel information, and p = 0, 1, ..., P-1. Wherein, the p-th group of channel association characteristics is a set of channel association characteristics among the P groups of channel association characteristics, the p-th channel information is one of the channel information among the P channel information, the P channel information is associated with Ks resources, and the Ks resources include the reference resource, where Ks is a positive integer greater than 1.

[0517] Optionally, the transceiver module 1402 is also used to receive uplink reference signals and determine reference channel information based on the uplink reference signals.

[0518] Optionally, the transceiver module 1402 is also used to receive third indication information, which is used to indicate reference channel information.

[0519] Optionally, the transceiver module 1402 is also used to send a fourth indication message, which is used to indicate Ks resources.

[0520] Optionally, the transceiver module 1402 is also used to send fifth indication information, which is used to indicate a first threshold, and the first threshold is used to determine P channel information.

[0521] All relevant content of each step involved in the above method embodiments can be referenced from the functional description of the corresponding functional module, and will not be repeated here.

[0522] In this application, the communication device (i.e., terminal device or network device) 1400 is presented in an integrated manner, divided into various functional modules. Here, "module" may refer to an application-specific integrated circuit (ASIC), a circuit, a processor and memory that executes one or more software or firmware programs, integrated logic circuits, and / or other devices that can provide the above functions.

[0523] In some embodiments, when the communication device 1400 in FIG14 is a chip or chip system, the function / implementation process of the transceiver module 1402 can be implemented through the input / output interface (or communication interface) of the chip or chip system, and the function / implementation process of the processing module 1401 can be implemented through the processor (or processing circuit) of the chip or chip system.

[0524] Since the communication device 1400 provided in this embodiment can execute the above method, the technical effects it can achieve can be referred to the above method embodiment, and will not be repeated here.

[0525] As another possible product form, the terminal device or network device described in the embodiments of this application can adopt the composition structure shown in FIG15, or include the components shown in FIG15. FIG15 is a schematic diagram of the composition of a communication device 1500 provided in an embodiment of this application. The communication device 1500 can be a terminal device or a chip or system-on-a-chip in a terminal device; it can also be a network device or a chip or system-on-a-chip in a network device. As shown in FIG15, the communication device 1500 includes a processor 1501, a transceiver 1502, and a communication line 1503.

[0526] Furthermore, the communication device 1500 may also include a memory 1504. The processor 1501, the memory 1504, and the transceiver 1502 can be connected via a communication line 1503.

[0527] The processor 1501 can be a central processing unit (CPU), a network processor (NP), a digital signal processor (DSP), a microprocessor, a microcontroller, a programmable logic device (PLD), or any combination thereof. The processor 1501 can also be other devices with processing capabilities, such as circuits, devices, or software modules, without limitation.

[0528] Transceiver 1502 is used to communicate with other devices or other communication networks. These other communication networks can be Ethernet, radio access network (RAN), wireless local area network (WLAN), etc. Transceiver 1502 can be a module, circuit, transceiver, or any device capable of enabling communication.

[0529] Communication line 1503 is used to connect different components in communication device 1500, enabling communication between them. Communication line 1503 can be a peripheral component interconnect (PCI) bus or an extended industry standard architecture (EISA) bus, etc. This bus can be divided into address bus, data bus, control bus, etc. For ease of illustration, only one thick line is used in Figure 15, but this does not indicate that there is only one bus or one type of bus.

[0530] The memory 1504 may be a device with storage function for storing instructions and / or data. The instructions may be computer programs.

[0531] For example, the memory 1504 may be a read-only memory (ROM) or other type of static storage device capable of storing static information and / or instructions; it may also be a random access memory (RAM) or other type of dynamic storage device capable of storing information and / or instructions; it may also be an electrically erasable programmable read-only memory (EEPROM), a compact disc read-only memory (CD-ROM) or other optical disc storage, optical disc storage (including compressed optical discs, laser discs, optical discs, digital universal optical discs, Blu-ray discs, etc.), magnetic disk storage media or other magnetic storage devices, etc., without limitation.

[0532] It should be noted that the memory 1504 can exist independently of the processor 1501 or can be integrated with the processor 1501. The memory 1504 can be used to store instructions, program code, or some data, etc. The memory 1504 can be located inside or outside the communication device 1500, without limitation. The processor 1501 is used to execute the instructions stored in the memory 1504 to implement the communication method for channel feedback provided in the following embodiments of this application.

[0533] In one example, processor 1501 may include one or more CPUs, such as CPU0 and CPU1 in Figure 15.

[0534] In some embodiments, those skilled in the art will recognize that the communication device 1400 may take the form of the communication device 1500 shown in FIG15 in terms of hardware implementation.

[0535] As an example, the function / implementation of the processing module 1401 in Figure 14 can be achieved by the processor 1501 in the communication device 1500 shown in Figure 15 calling computer execution instructions stored in the memory 1504. The function / implementation of the transceiver module 1402 in Figure 14 can be achieved by the transceiver 1502 in the communication device 1500 shown in Figure 15.

[0536] As an optional implementation, the communication device 1500 may include multiple processors, for example, in addition to the processor 1501 in FIG15, it may also include a processor 1507.

[0537] As an optional implementation, the communication device 1500 also includes an output device 1505 and an input device 1506. Exemplarily, the input device 1506 is a liquid crystal display (LCD), a light-emitting diode (LED) display device, a cathode ray tube (CRT) display device, or a projector, etc. For example, the input device 1506 can be a keyboard, mouse, microphone, joystick, touchscreen device, or sensing device, etc. The output device 1505 is a display screen, a speaker, etc.

[0538] It should be noted that the communication device 1500 may be a desktop computer, a portable computer, a web server, a mobile phone, a tablet computer, a wireless terminal, an embedded device, a chip system, or a device with a similar structure to that shown in Figure 15. Furthermore, the composition shown in Figure 15 does not constitute a limitation on the communication device. In addition to the components shown in Figure 15, the communication device may include more or fewer components than shown, or combine certain components, or have different component arrangements.

[0539] In this embodiment of the application, the chip system may be composed of chips or may include chips and other discrete devices.

[0540] As another possible product form, the terminal device or network device described in this application embodiment can be implemented using a general bus architecture. For ease of explanation, refer to Figure 16, which is a schematic diagram of the structure of a communication device 1600 provided in an embodiment of this application. The communication device 1600 includes a processor 1601 and a transceiver 1602. The communication device 1600 can be a terminal device, or a chip or chip system therein; or, the communication device 1600 can be a network device, or a chip or module therein. Figure 16 only shows the main components of the communication device 1600. In addition to the processor 1601 and transceiver 1602, the communication device may further include a memory 1603.

[0541] Optionally, the processor 1601 is mainly used to process communication protocols and communication data, control the entire communication device, execute software programs, and process the data of the software programs. The memory 1603 is mainly used to store software programs and data. The transceiver 1602 may include radio frequency (RF) circuitry and an antenna. The RF circuitry is mainly used for converting baseband signals to RF signals and processing RF signals. The antenna is mainly used for transmitting and receiving RF signals in the form of electromagnetic waves.

[0542] Optionally, the processor 1601, transceiver 1602, and memory 1603 can be connected via a communication bus.

[0543] When the communication device is powered on, the processor 1601 can read the software program in the memory 1603, interpret and execute the instructions of the software program, and process the data of the software program. When data needs to be transmitted wirelessly, the processor 1601 performs baseband processing on the data to be transmitted and outputs the baseband signal to the radio frequency (RF) circuit. The RF circuit processes the baseband signal and transmits the RF signal outward in the form of electromagnetic waves through the antenna. When data is sent to the communication device, the RF circuit receives the RF signal through the antenna, converts the RF signal into a baseband signal, and outputs the baseband signal to the processor 1601. The processor 1601 converts the baseband signal into data and processes the data.

[0544] In some embodiments, transceiver 1602 may include a transmitter and a receiver, wherein the transmitter is used to implement the transmission operation in the above method embodiments; and the receiver is used to implement the reception operation in the above method embodiments.

[0545] For example, when the communication device is a chip, the chip may not include the memory 1603; that is, the communication device includes a processor 1601 and a transceiver 1602. In this case, the transceiver 1602 is the input / output interface of the chip, wherein the transmitter in the transceiver corresponds to the output interface of the chip, and the receiver in the transceiver corresponds to the input interface of the chip.

[0546] In some embodiments, this application also provides a communication device, which includes a processor for implementing the methods in any of the above method embodiments.

[0547] As one possible implementation, the communication device also includes a memory. This memory stores necessary computer programs or instructions. The processor can invoke the computer programs or instructions in the memory to cause the communication device to execute the methods in any of the above method embodiments. Alternatively, the memory may be external and not located within the communication device.

[0548] As another possible implementation, the communication device also includes an interface circuit, which is a code / data read / write interface circuit, used to receive computer execution instructions (which are stored in memory and may be read directly from memory or may be transmitted through other devices) and transmit them to the processor.

[0549] As another possible implementation, the communication device also includes a communication interface for communicating with modules outside the communication device.

[0550] It is understood that the communication device can be a chip or a chip system. When the communication device is a chip system, it can be composed of chips or may include chips and other discrete devices. This application does not specifically limit this.

[0551] This application also provides a computer-readable storage medium having a computer program or instructions stored thereon, which, when executed by a computer, implements the functions of any of the above-described method embodiments.

[0552] This application also provides a computer program product that, when executed by a computer, implements the functions of any of the above method embodiments.

[0553] Those skilled in the art will understand that, for the sake of convenience and brevity, the specific working processes of the systems, devices, and units described above can be referred to the corresponding processes in the foregoing method embodiments, and will not be repeated here.

[0554] It is understood that the systems, apparatuses, and methods described in this application can also be implemented in other ways. For example, the apparatus embodiments described above are merely illustrative. For instance, the division of units is only a logical functional division, and in actual implementation, there may be other division methods. For example, multiple units or components may be combined or integrated into another system, or some features may be ignored or not executed. Furthermore, the coupling or direct coupling or communication connection shown or discussed may be through some interfaces; the indirect coupling or communication connection between apparatuses or units may be electrical, mechanical, or other forms.

[0555] The units described as separate components may or may not be physically separate; that is, they may be located in one place or distributed across multiple network units. The components shown as units may or may not be physical units. Some or all of the units can be selected to achieve the purpose of this embodiment, depending on actual needs.

[0556] In addition, the functional units in the various embodiments of this application can be integrated into one processing unit, or each unit can exist physically separately, or two or more units can be integrated into one unit.

[0557] In the above embodiments, implementation can be achieved, in whole or in part, through software, hardware, firmware, or any combination thereof. When implemented using software programs, implementation can be, in whole or in part, in the form of a computer program product. This computer program product includes one or more computer instructions. When the computer program or instructions are loaded and executed on a computer, all or part of the processes or functions described in the embodiments of this application are generated. The computer can be a general-purpose computer, a special-purpose computer, a computer network, or other programmable device. The computer instructions can be stored in a computer-readable storage medium or transmitted from one computer-readable storage medium to another. For example, the computer instructions can be transmitted from one website, computer, server, or data center to another via wired (e.g., coaxial cable, fiber optic, digital subscriber line (DSL)) or wireless (e.g., infrared, wireless, microwave, etc.) means. The computer-readable storage medium can be any available medium accessible to a computer or a data storage device containing one or more servers, data centers, etc., that can be integrated with the medium. The available medium can be a magnetic medium (e.g., floppy disk, hard disk, magnetic tape), an optical medium (e.g., DVD), or a semiconductor medium (e.g., solid-state drive (SSD)). In this embodiment, the computer may include the aforementioned apparatus.

[0558] Although this application has been described herein in conjunction with various embodiments, those skilled in the art, by reviewing the accompanying drawings, disclosure, and appended claims, will understand and implement other variations of the disclosed embodiments in carrying out the claimed application. In the claims, the word "comprising" does not exclude other components or steps, and "a" or "an" does not exclude a plurality. A single processor or other unit can implement several functions listed in the claims. While different dependent claims may recite certain measures, this does not mean that these measures cannot be combined to produce good results.

Claims

1. A communication method for channel feedback, characterized by, The method comprises: receiving first indication information, the first indication information being used for indicating a reference resource; sending second indication information, the second indication information being used for indicating P sets of channel association characteristics, P being a positive integer greater than 1, the pth set of channel association characteristics being used for indicating information difference between the pth channel information and reference channel information, p=0,1,…,P-1; wherein the pth set of channel association characteristics is one set of channel association characteristics in the P sets of channel association characteristics, the pth channel information is one channel information in P channel information, the P channel information is determined according to Ks resources, the Ks resources include the reference resource, the reference channel information is channel information corresponding to the reference resource, Ks is a positive integer greater than 1.

2. The method of claim 1, wherein, The method further comprises: sending an uplink reference signal, the uplink reference signal being used for determining the reference channel information.

3. The method of claim 1, wherein, The method further comprises: sending third indication information, the third indication information being used for indicating the reference channel information.

4. The method according to any one of claims 1 to 3, characterized in that, Before the sending of the second indication information, the method further comprises: receiving fourth indication information, the fourth indication information being used for indicating the Ks resources.

5. The method according to any one of claims 1 to 4, characterized in that, The P channel information is determined according to Ks resources, comprising: the P channel information is part or all of M channel information, the M channel information is determined according to the Ks resources, M being a positive integer greater than or equal to 1.

6. A communication method for channel feedback, characterized by, The method comprises: sending first indication information, the first indication information being used for indicating a reference resource; receiving second indication information, the second indication information being used for indicating P sets of channel association characteristics, P being a positive integer greater than 1; obtaining reference channel information, the reference channel information being channel information corresponding to the reference resource; determining P channel information according to the P sets of channel association characteristics and the reference channel information, the pth set of channel association characteristics being used for indicating information difference between the pth channel information and the reference channel information, p=0,1,…,P-1; wherein the pth set of channel association characteristics is one set of channel association characteristics in the P sets of channel association characteristics, the pth channel information is one channel information in the P channel information, the P channel information is associated with Ks resources, the Ks resources include the reference resource, Ks being a positive integer greater than 1.

7. The method of claim 6, wherein, The obtaining of the reference channel information comprises: receiving an uplink reference signal; determining the reference channel information according to the uplink reference signal.

8. The method of claim 6, wherein, The obtaining of the reference channel information comprises: receiving third indication information, the third indication information being used for indicating the reference channel information.

9. The method according to any one of claims 6-8, characterized in that, Before the receiving of the second indication information, the method further comprises: sending fourth indication information, the fourth indication information being used for indicating the Ks resources.

10. The method according to any one of claims 6-9, characterized in that, The P channel information is associated with Ks resources, comprising: the P channel information is part or all of M channel information, the M channel information is associated with the Ks resources, M being a positive integer greater than or equal to 1.

11. The method of any one of claims 1-10, wherein, The reference channel information is determined according to I groups of reference channel parameters, the i-th group of reference channel parameters in the I groups of reference channel parameters is used to indicate channel information corresponding to the i-th antenna port in a reference port group, the reference port group is a port group corresponding to the reference resource, the reference port group includes I antenna ports, the I groups of reference channel parameters correspond to the I antenna ports respectively, I is a positive integer greater than or equal to 1, i = 0, 1, …, I-1; The p-th channel information is determined according to I groups of p-th channel parameters, the i-th group of p-th channel parameters in the I groups of p-th channel parameters is used to indicate channel information corresponding to the i-th antenna port in a p-th port group, the p-th port group is a port group corresponding to a p-th resource in P resources, the p-th resource is one of the P resources, and the P resources correspond to the P channel information respectively.

12. The method of claim 11, wherein, The p-th group of channel association characteristics is determined according to I groups of channel association parameters, the i-th group of channel association parameters in the I groups of channel association parameters is used to indicate a channel difference between the i-th group of reference channel parameters and the i-th group of p-th channel parameters.

13. The method of claim 12, wherein, The ith set of channel correlation parameters, the ith set of reference channel parameters, and the ith set of pth channel parameters satisfy: where d p,i is the ith set of channel correlation parameters, h′ #s,i is the ith set of reference channel parameters, h′ #p,i is the ith set of the pth channel parameters, (*) H denotes the conjugate transpose, i = 0, 1, …, I - 1, p = 0, 1, …, P - 1.

14. The method of claim 12, wherein, The i-th group of channel association parameters is determined according to N sub-reference channel parameters and N p-th sub-channel parameters; The i-th group of reference channel parameters includes the N sub-reference channel parameters, the i-th group of p-th channel parameters includes the N p-th sub-channel parameters, N is a number of frequency points corresponding to frequency domain resources in the Ks resources, and N is a positive integer greater than 1.

15. The method of claim 14, wherein, The n-th sub-reference channel parameter in the N sub-reference channel parameters is used to indicate channel information corresponding to an n-th frequency point in N frequency points corresponding to the i-th antenna port in the reference port group, the N frequency points correspond to the N sub-reference channel parameters respectively, and n = 0, 1, …, N-1; The n-th p-th sub-channel parameter in the N p-th sub-channel parameters is used to indicate channel information corresponding to the n-th frequency point in the N frequency points corresponding to the i-th antenna port in the p-th port group, and the N frequency points correspond to the N p-th sub-channel parameters respectively.

16. The method of claim 15, wherein, The N sub-reference channel parameters, the Nth p sub-channel parameters, and the ith group of channel correlation parameters satisfy: where d p,i is the ith group of channel-related parameters, h′ #s,i (n) is the nth sub-reference channel parameter, h′ #p,i (n) is the nth pth sub-channel parameter, i = 0, 1, …, I - 1, p = 0, 1, …, P - 1, n = 0, 1, …, N RB - 1, N RB is the number of RBs or subbands in the bandwidth to which the Ks resources belong, N = N RB , (*) H denotes conjugate transpose.

17. The method of claim 14, wherein, The n-th sub-reference channel parameter in the N sub-reference channel parameters is used to indicate channel information of an n-th time domain in N time domain channel information corresponding to the i-th antenna port in the reference port group, the N time domain channel information corresponding to the i-th antenna port in the reference port group corresponds to the N sub-reference channel parameters respectively, N frequency points corresponding to frequency domain resources in the Ks resources correspond to the N time domain channel information respectively, and n = 0, 1, …, N-1. The n th P subchannel parameter in the N P subchannel parameters is used to indicate n th time domain channel information corresponding to the i th antenna port in the P port group, and the N time domain channel information corresponding to the i th antenna port in the P port group corresponds to the N P subchannel parameters respectively.

18. The method of claim 17, wherein, The N sub-reference channel parameters, the Nth p sub-channel parameters, and the ith group of channel correlation parameters satisfy: wherein d p,i is the ith group of channel-related parameters, h #s,i (n) is the nth sub-reference channel parameter, h #p,i (n) is the nth pth sub-channel parameter, i = 0, 1, …, I - 1, p = 0, 1, …, P - 1, n = 0, 1, …, N RB - 1, N RB is the number of RBs or sub-bands in the bandwidth to which the Ks resources belong, N = N RB H denotes conjugate transpose.​ 19. The method of claim 14, wherein, The i th group of channel association parameters is determined according to N sub-reference channel parameters and N P subchannel parameters, and includes: The i th group of channel association parameters is determined according to N groups of subchannel association parameters, and the n th group of subchannel association parameters in the N groups of subchannel association parameters is used to indicate the information difference between the n th sub-reference channel parameter and the n th P subchannel parameter, n = 0, 1, …, N-1. Wherein, the n th sub-reference channel parameter is one of the N sub-reference channel parameters, and the n th P subchannel parameter is one of the N P subchannel parameters.

20. The method of claim 19, wherein, The n th sub-reference channel parameter is used to indicate the channel information corresponding to the i th antenna port in the reference port group in the n th time period, and the n th P subchannel parameter is used to indicate the channel information corresponding to the i th antenna port in the P port group in the n th time period. Wherein, the n th time period is one of the N time periods within a first time delay, and the first time delay is a time delay corresponding to the time domain resource of any one of the Ks reference signal resources, and the time delay corresponding to the time domain resource of each reference signal resource in the Ks reference signal resources is equal.

21. The method of claim 20, wherein, The nth group of subchannel association parameters, the nth sub-reference channel parameter, and the nth pth subchannel parameter satisfy: wherein t n represents the nth time period of the N time periods, d p,i (n) is the nth set of subchannel association parameters, h″ #s,i (t) is the sub-reference channel parameter corresponding to the nth time period of the N time periods corresponding to the ith antenna port pair within the reference port group, h″ #p,i is the subchannel parameter corresponding to the nth time period of the N time periods corresponding to the ith antenna port pair within the pth port group, i = 0, 1, …, I-1, p = 0, 1, …, P-1, t = 0, 1, …, N RB -1, n = t, N RB is the number of RBs or subbands in the bandwidth to which the Ks resources belong, N = N RB , (*) H denotes conjugate transpose.

22. The method according to any one of claims 15-21, characterized in that, The n th subchannel parameter in the P channel information satisfies a first condition, and the first condition is related to a first threshold; wherein the first condition satisfies one or more of the following: The difference between the first received power and the second received power is less than or equal to the first threshold, the first received power is the received power corresponding to the n th subchannel parameter in the P channel information, and the second received power is the received power corresponding to the maximum subchannel parameter corresponding to the i th antenna port in the P port group; or, The ratio between the n th subchannel parameter and the maximum subchannel parameter corresponding to the i th antenna port in the P port group is less than or equal to the first threshold; or, The difference between the first received power and the third received power is less than or equal to the first threshold, and the third received power is the received power corresponding to the maximum subchannel parameter corresponding to the i th antenna port in the reference port group; or, The difference between the first received power and the fourth received power is less than or equal to the first threshold, and the fourth received power is the received power corresponding to the maximum subchannel parameter in the (P+1) subchannel parameters corresponding to the (P+1)*I antenna ports in the (P+1) port group, and the P+1 port group includes the P port group corresponding to the P resources and the reference port group; or, The ratio between the nth subchannel parameter and the maximum subchannel parameter in the (P+1) subchannel parameters is less than or equal to the first threshold value.

23. The method of any one of claims 1-22, wherein, The Ks resources are located in a same resource set; and / or, the Ks resources have a same subcarrier spacing.

24. The method of any one of claims 1-23, wherein, Time domain resources in the Ks resources are located in a same time unit, or time domain resources in the Ks resources are located in adjacent time units, or an interval between a first time domain resource and a last time domain resource in the time domain resources in the Ks resources is less than or equal to T orthogonal frequency division multiplexing, OFDM, symbols, T being a positive integer greater than or equal to 1.

25. A communications device, characterized by The communication apparatus comprises a transceiver module and a processing module, The transceiver module is configured to perform a receiving action or a transmitting action in the method according to any one of claims 1-5, 11-24, or perform a receiving action or a transmitting action in the method according to any one of claims 6-24. The processing module is configured to perform a processing action in the method according to any one of claims 1-5, 11-24, or perform a processing action in the method according to any one of claims 6-24.

26. A communications device, characterized by The communication apparatus comprises a processor, and the processor is configured to run a computer program or instructions to cause the communication apparatus to perform the method according to any one of claims 1-5, 11-24, or to perform the method according to any one of claims 6-24.

27. The apparatus of claim 26, wherein, The communication apparatus further comprises a memory, and the memory is configured to store the computer program or instructions required for performing the method according to any one of claims 1-5, 11-24, or to store the computer program or instructions required for performing the method according to any one of claims 6-24.

28. A computer-readable storage medium, characterized in that, A computer readable storage medium stores computer instructions or programs, when the computer instructions or programs are run on a computer, causing the method according to any one of claims 1-5, 11-24 to be performed, causing the method according to any one of claims 6-24 to be performed.

29. A computer program product, characterised in that, The computer program product comprises computer programs or instructions; when part or all of the computer instructions are run on a computer, causing the method according to any one of claims 1-5, 11-24 to be performed, causing the method according to any one of claims 6-24 to be performed.

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