Channel state information reporting method, device, and readable storage medium

Abstract

The present application relates to the field of communication technologies, and in particular to a channel state information reporting method, device, and readable storage medium. The method includes: determining indication information of M coefficients based on reference signals on N reference signal resources, where priorities of the M coefficients are determined based on the priorities of the N reference signal resources, and the M coefficients are used to determine a precoding matrix; and transmitting first information, where the first information includes indication information of K coefficients, where the K coefficients are determined from the M coefficients based on the priorities of the M coefficients. This ensures that more important information can be reported with priority, thereby reducing performance loss in the communication system.

Description

[Technical Field]

[0001] The present application relates to the field of communication technology, and in particular to a channel state information reporting method, apparatus, and readable storage medium. [Background technology]

[0002] In existing long-term evolution (LTE) and new-generation radio access technology (NR) communication systems, a base station (BS) needs to acquire downlink channel state information (CSI) to determine settings such as resources, modulation and coding scheme (MCS), and precoding for scheduling downlink data channels of user equipment (UE). In a time division duplex (TDD) system, because there is interdependence between the uplink and downlink channels, a base station may acquire uplink CSI by measuring an uplink reference signal (UPS) to estimate accurate downlink CSI, e.g., to use the uplink CSI as the downlink CSI. However, in a frequency division duplex (FDD) system, the interdependence between the uplink and downlink channels cannot be guaranteed, and the downlink CSI is acquired by measuring a channel state information reference signal (CSI-RS) or a synchronization signal / physical broadcast channel block (SS / PBCH block, SSB). Then, the UE generates a CSI report in a manner predefined in a protocol or configured by the base station, and reports the CSI report to the base station, so that the base station acquires the downlink CSI.

[0003] To improve the overall performance and user experience of a communication system, multiple transmission reception points (TRPs) may be used to serve one user equipment (UE) in a multi-station cooperative manner. There are several multi-station cooperative schemes, such as coherent joint transmission (CJT) and non-coherent joint transmission (NCJT). In the CJT cooperative scheme, multiple TRPs may simultaneously serve a UE. To enable multi-TRP coherent joint transmission, a UE needs to jointly report downlink channel state information (CSI) to the TRPs in a multi-station cooperative set. However, current downlink CSI reporting solutions lack an effective CSI reporting mechanism for multi-TRP coherent joint transmission scenarios. Summary of the Invention

[0004] The embodiments of the present application provide a channel state information reporting method, device, and readable storage medium. When CSI is reported for a multi-TRP CJT scenario, a reference signal resource dimension (i.e., TRP dimension) is further introduced, allowing a UE to report aggregate downlink CSI for all TRPs, enabling multi-TRP coherent aggregate transmission. The provided priority function effectively solves the problem of determining the reporting order of related information for different coefficients corresponding to different TRPs, ensures that more important information can be reported preferentially as much as possible, and can be used to reduce performance loss in the communication system.

[0005] The following describes the present application from various aspects. It should be understood that the following implementations and advantages of the various aspects may be cross-referenced.

[0006] According to a first aspect, the present application provides a channel state information reporting method applied to a terminal device, the method including: receiving a reference signal on N reference signal resources; determining, based on the reference signal on the N reference signal resources, indication information of M coefficients, where priorities of the M coefficients are determined based on the priorities of the N reference signal resources, where M and N are both integers greater than 1, and the M coefficients are used to determine a precoding matrix; and transmitting first information, where the first information includes indication information of K coefficients, where the K coefficients are determined from the M coefficients based on the priorities of the M coefficients, where K is a positive integer less than or equal to M.

[0007] For the current Rel-16 eType-II codebook and Rel-17 FeType-II codebook, only solutions for defining coefficient priorities during CSI reporting are considered for single-TRP (corresponding to a single reference signal resource) transmission scenarios or two-TRP non-coherent joint transmission scenarios, and are not applicable to multi-TRP joint CJT scenarios. In this embodiment of the present application, when a terminal device (UE) reports CSI for a multi-TRP joint transmission scenario, a reference signal resource dimension (i.e., a TRP dimension) is further introduced, allowing the UE to report joint downlink CSI for each TRP, thereby enabling multi-TRP coherent joint transmission. The priorities of coefficients may be determined based on the priorities of different TRPs (corresponding to reference signal resources) to reflect the different priorities of coefficients corresponding to different TRPs. This effectively solves the problem of determining the reporting order of related information for different coefficients corresponding to different TRPs, ensuring that more important information is reported as preferentially as possible, thereby reducing performance loss in the communication system.

[0008] According to a second aspect, the present application provides a channel state information reporting method applicable to a network device, the method including: transmitting a reference signal on a reference signal resource; and receiving first information, the first information including indication information of K coefficients, the K coefficients being determined from the M coefficients based on priorities of the M coefficients, the reference signal resource being any one of N reference signal resources, M and N being integers greater than 1, K being a positive integer less than or equal to M, the priorities of the M coefficients being determined based on the priorities of the N reference signal resources, and the M coefficients being used to determine a precoding matrix.

[0009] With reference to the second aspect, in a possible implementation, the method further comprises determining a precoding matrix based on indication information of the K coefficients, the indication information being included in the first information.

[0010] With reference to the first or second aspect, in a possible implementation, the first information includes indication information of some or all of the M coefficients, and some or all of the coefficients may be determined from the M coefficients based on priorities of the M coefficients.

[0011] In this embodiment of the present application, when reporting CSI, the terminal device (UE) may first compare the overhead of the CSI to be reported with the size of the CSI reporting resource set by the network device (base station). Then, the indication information of the coefficients that need to be reported may be determined based on the comparison decision and the priority of the coefficients to ensure effective transmission of the indication information of the coefficients.

[0012] With reference to the first or second aspect, in a possible implementation, the priorities of the M coefficients are further determined based on one or more of a transmission layer sequence number, a spatial domain basis vector sequence number, a reference signal port sequence number, and a frequency domain basis vector sequence number.

[0013] In this embodiment of the present application, the UE may determine the priorities of the M coefficients based on the priority of the reference signal resource and one or more of a transmission layer sequence number, a spatial domain basis vector sequence number, a reference signal port sequence number, and a frequency domain basis vector sequence number. For example, to solve the problem of how to determine the reporting order of related information of different coefficients, priority functions of coefficients corresponding to different transmission layers, different TRPs, different spatial domain basis vectors / reference signal ports, and different frequency domain basis vectors may be predefined.

[0014] With reference to the first or second aspect, in a possible implementation, the priority of coefficients associated with spatial domain basis vectors or reference signal ports corresponding to any one of the N reference signal resources may be determined by: If the priority of the n1-th reference signal resource among the N reference signal resources is higher than the priority of the n2-th reference signal resource among the N reference signal resources, the priority of a coefficient associated with any spatial domain basis vector corresponding to the n1-th reference signal resource is higher than the priority of a coefficient associated with any spatial domain basis vector corresponding to the n2-th reference signal resource, or the priority of a coefficient associated with any reference signal port corresponding to the n1-th reference signal resource is higher than the priority of a coefficient associated with any reference signal port corresponding to the n2-th reference signal resource, or If the priority of the n1-th reference signal resource among the N reference signal resources is higher than the priority of the n2-th reference signal resource among the N reference signal resources, the priority of a coefficient associated with the i-th spatial domain basis vector corresponding to the n1-th reference signal resource is higher than the priority of a coefficient associated with the i-th spatial domain basis vector corresponding to the n2-th reference signal resource having the same sequence number, or the priority of a coefficient associated with the i-th reference signal port corresponding to the n1-th reference signal resource is higher than the priority of a coefficient associated with the i-th reference signal port corresponding to the n2-th reference signal resource having the same sequence number, where i represents the sequence number of the spatial domain basis vector or the reference signal port. The decision is made according to one or more of the first preset rules:

[0015] In this embodiment of the present application, some rules for determining the priorities of the coefficients are provided to provide a basis for the UE to determine the priorities of the M coefficients, so that the UE can effectively send indication information of the coefficients when reporting CSI.

[0016] With reference to the first or second aspect, in a possible implementation, the priorities of the M coefficients are:

number

[0017] In this embodiment of the present application, when determining the priorities of the M coefficients, the UE may refer to a specified priority function to determine the priorities of the coefficients and determine a priority value Pri(l,i,f,n) of the coefficient corresponding to a given sequence number combination (l,i,f,n). That is, when l, i, f, n in a given sequence number combination (l,i,f,n) are set to different values, different priority values ​​of the coefficients can be obtained to determine the priorities of the M coefficients. In the above specified priority function, various constraints, for example, φ(i,n)<2L, where X is an integer equal to or greater than N, may be satisfied. max The constraint X, and other constraints, can ensure that when each of l, i, f, n in various given sequence number combinations (l, i, f, n) is set to a different value, the priority values ​​Pri(l, i, f, n) of the coefficients corresponding to all combinations are different.

[0018] With reference to the first or second aspect, in a possible implementation, φ(i,n) is

number

number

number

[0019] In this embodiment of the present application, once the priorities of the M coefficients are determined, the reference signal resource dimension and the spatial domain basis vector dimension can be combined, so that for a combination (i,n) of a reference signal resource and a spatial domain basis vector with a given sequence number, φ(i,n) indicates the priority of the coefficient set associated with the i-th spatial domain basis vector corresponding to the n-th reference signal resource. During the design of φ(i,n), one should refer to any one of the above formulas, which can provide a basis for determining the priorities of the M coefficients.

[0020] With reference to the first or second aspect, in a possible implementation, if the priority of the n1-th reference signal resource among the N reference signal resources is higher than the priority of the n2-th reference signal resource among the N reference signal resources, the priority of any coefficient associated with the n1-th reference signal resource is higher than the priority of any coefficient associated with the n2-th reference signal resource.

[0021] In this embodiment of the present application, in order to ensure that the UE can effectively transmit the indication information of the important coefficients when reporting CSI, some rules for determining the priority of the coefficients are provided to provide a criterion for the UE to determine the priorities of the M coefficients.

[0022] With reference to the first or second aspect, in a possible implementation, the priorities of the M coefficients are:

number

[0023] In this embodiment of the present application, when determining the priorities of M coefficients, the UE may refer to a specified priority function to determine the priorities of the coefficients and determine a priority value Pri(l,i,f,n) of the coefficient corresponding to a given sequence number combination (l,i,f,n). That is, when l,i,f,n in a given sequence number combination (l,i,f,n) are set to different values, different priority values ​​of the coefficients may be obtained to determine the priorities of the M coefficients. In the above specified priority function, various constraints, for example, Y is M v By using the constraint that Y is an integer greater than or equal to N3, or by using another constraint that Y is an integer greater than or equal to N3, when l, i, f, n in different given sequence number combinations (l, i, f, n) are set to different values, it can be ensured that the priority values ​​Pri(l, i, f, n) of the coefficients corresponding to all combinations are different.

[0024] With reference to the first or second aspect, in a possible implementation, π(f) is The formula π(f)=f,

number

number

number

number

[0025] In this embodiment of the present application, when determining the priorities of the M coefficients, the UE may refer to the above remapping function π(f) to perform a global remapping on the sequence numbers or indexes of the frequency-domain basis vectors selected for the l-th transmission layer and the n-th reference signal resource, so that the frequency-domain basis vector corresponding to the strongest coefficient of each transmission layer is always located at the position of the first frequency-domain basis vector, or may perform a global remapping on the sequence numbers or indexes of the frequency-domain basis vectors selected for each reference signal resource corresponding to the l-th transmission layer, so that the frequency-domain basis vector corresponding to the strongest coefficient of each reference signal resource corresponding to each transmission layer is always located at the position of the first frequency-domain basis vector of the reference signal resource. In this way, the UE may preferentially report the coefficient corresponding to the frequency-domain basis vector corresponding to the smallest coefficient, and then report the coefficients corresponding to the frequency-domain basis vectors on both sides of the frequency-domain basis vector corresponding to the strongest coefficient.

[0026] With reference to the first or second aspect, in a possible implementation, the priorities of the M coefficients are:

number

[0027] In this embodiment of the present application, when determining the priorities of M coefficients, the UE may refer to a specified priority function to determine the priorities of the coefficients and determine the priority value Pri(l,i,f,n) of the coefficient corresponding to a given sequence number combination (l,i,f,n). That is, when l,i,f,n in a given sequence number combination (l,i,f,n) are set to different values, the priority values ​​of different coefficients may be obtained to determine the priorities of M coefficients. In the above specified priority function, various constraints may be satisfied, for example, when Y is less than M v By being an integer greater than or equal to 1, it is possible to ensure that when l, i, f, n in different given sequence number combinations (l, i, f, n) are set to different values, the priority values ​​Pri(l, i, f, n) of the coefficients corresponding to all combinations are different.

[0028] With reference to the first or second aspect, in a possible implementation, the priorities of the M coefficients are:

number

[0029] In this embodiment of the present application, when determining the priorities of the M coefficients, the UE may refer to a specified priority function to determine the priorities of the coefficients and determine a priority value Pri(l,i,f,n) of the coefficients corresponding to a given sequence number combination (l,i,f,n). That is, when l,i,f,n in a given sequence number combination (l,i,f,n) are set to different values, different priority values ​​of the coefficients may be obtained to determine the priorities of the M coefficients. In the above specified priority function, various constraints, such as X being an integer greater than or equal to N and φ(i,n)<2Lmax·X, and other constraints, can ensure that when l,i,f,n in different given sequence number combinations (l,i,f,n) are set to different values, the priority values ​​Pri(l,i,f,n) of the coefficients corresponding to all combinations are different.

[0030] With reference to the first or second aspect, in a possible implementation, φ(i,n) is

number

number

number

number

[0031] In this embodiment of the present application, once the priorities of the M coefficients are determined, the reference signal resource dimension and the reference signal port dimension can be combined, so that for a combination (i,n) of a reference signal resource and a reference signal port with a given sequence number, φ(i,n) indicates the priority of the coefficient set associated with the i-th reference signal port corresponding to the n-th reference signal resource. During the design of φ(i,n), one should refer to any one of the above formulas, which can provide a basis for determining the priorities of the M coefficients.

[0032] With reference to the first or second aspect, in a possible implementation, the smaller the value of Pri(l,i,f,n), the higher the priority of the coefficient corresponding to a given sequence number combination of the lth transmission layer, the nth reference signal resource, the ith spatial domain basis vector or reference signal port, and the fth frequency domain basis vector.

[0033] With reference to the first or second aspect, in a possible implementation, the priorities of the N reference signal resources are determined as follows: A reference signal resource corresponding to a larger number of spatial domain basis vectors or a reference signal resource from which a larger number of reference signal ports are selected has a higher priority. The reference signal resource corresponding to the larger amplitude of the strongest coefficient has a higher priority. A reference signal resource corresponding to a higher signal strength of the reference signal has a higher priority, or A reference signal resource corresponding to a lower sequence number of the reference signal resource has a higher priority. The decision is made according to one or more of the second preset rules:

[0034] With reference to the first or second aspect, in a possible implementation, the smaller the value of G(n), the higher the priority of the nth reference signal resource.

[0035] With reference to the first or second aspect, in a possible implementation, the indication of the coefficients comprises one or more of: an indication of the amplitude of the coefficients; an indication of the phase of the coefficients; and an indication of the position of the coefficients.

[0036] With reference to the first or second aspect, in a possible implementation, the smaller the value of φ(i,n), the higher the priority of the coefficient set associated with the i-th spatial domain basis vector or reference signal port corresponding to the n-th reference signal resource.

[0037] With reference to the first or second aspect, in a possible implementation, when a preset condition is satisfied, the priorities of the M coefficients are determined based on a function corresponding to the preset condition among the preset functions, the preset function being:

number

[0038] According to a third aspect, the present application provides a communication device, comprising: a receiving unit configured to receive a reference signal on the N reference signal resources; a processing unit configured to determine indication information of M coefficients based on reference signals on N reference signal resources, where priorities of the M coefficients are determined based on priorities of the N reference signal resources, where M and N are both integers greater than 1, and the M coefficients are used to determine a precoding matrix; a transmitting unit configured to transmit first information, the first information including indication information of K coefficients, the K coefficients being determined from the M coefficients based on priorities of the M coefficients, where K is a positive integer less than or equal to M; Includes.

[0039] According to a fourth aspect, the present application provides a communication device, the communication device being configured to perform steps or functions performed by a second communication device, the communication device comprising: a processing unit configured to generate a reference signal; a transmitting unit configured to transmit a reference signal on a corresponding reference signal resource among the N reference signal resources; a receiving unit configured to receive first information, the first information including indication information of K coefficients, the K coefficients being determined from the M coefficients based on priorities of the M coefficients, the reference signal resource being any one of the N reference signal resources, M and N being integers greater than 1, K being a positive integer less than or equal to M, the priorities of the M coefficients being determined based on the priorities of the N reference signal resources, and the M coefficients being used to determine a precoding matrix; and Includes.

[0040] With reference to the fourth aspect, in a possible implementation, the processing unit is further configured to determine the precoding matrix based on indication information of the K coefficients, which indication information is included in the first information.

[0041] With reference to the third or fourth aspect, in a possible implementation, the priorities of the M coefficients are further determined based on one or more of a transmission layer sequence number, a spatial domain basis vector sequence number, a reference signal port sequence number, and a frequency domain basis vector sequence number.

[0042] With reference to the third or fourth aspect, in a possible implementation, the priority of coefficients associated with spatial domain basis vectors or reference signal ports corresponding to any one of the N reference signal resources may be determined by: If the priority of the n1-th reference signal resource among the N reference signal resources is higher than the priority of the n2-th reference signal resource among the N reference signal resources, the priority of a coefficient associated with any spatial domain basis vector corresponding to the n1-th reference signal resource is higher than the priority of a coefficient associated with any spatial domain basis vector corresponding to the n2-th reference signal resource, or the priority of a coefficient associated with any reference signal port corresponding to the n1-th reference signal resource is higher than the priority of a coefficient associated with any reference signal port corresponding to the n2-th reference signal resource, or If the priority of the n1-th reference signal resource among the N reference signal resources is higher than the priority of the n2-th reference signal resource among the N reference signal resources, the priority of a coefficient associated with the i-th spatial domain basis vector corresponding to the n1-th reference signal resource is higher than the priority of a coefficient associated with the i-th spatial domain basis vector corresponding to the n2-th reference signal resource having the same sequence number, or the priority of a coefficient associated with the i-th reference signal port corresponding to the n1-th reference signal resource is higher than the priority of a coefficient associated with the i-th reference signal port corresponding to the n2-th reference signal resource having the same sequence number, where i represents the sequence number of the spatial domain basis vector or the reference signal port. The decision is made according to one or more of the first preset rules:

[0043] With reference to the third or fourth aspect, in a possible implementation, the priorities of the M coefficients are:

number

[0044] With reference to the third or fourth aspect, in a possible implementation, φ(i,n) is

number

number

number

[0045] With reference to the third or fourth aspect, in a possible implementation, if the priority of the n1-th reference signal resource among the N reference signal resources is higher than the priority of the n2-th reference signal resource among the N reference signal resources, the priority of any coefficient associated with the n1-th reference signal resource is higher than the priority of any coefficient associated with the n2-th reference signal resource.

[0046] With reference to the third or fourth aspect, in a possible implementation, the priorities of the M coefficients are:

number

[0047] With reference to the third or fourth aspect, in a possible implementation, π(f) is The formula π(f)=f,

number

number

number

number

[0048] With reference to the third or fourth aspect, in a possible implementation, the priorities of the M coefficients are:

number

[0049] With reference to the third or fourth aspect, in a possible implementation, the priorities of the M coefficients are:

number

[0050] With reference to the third or fourth aspect, in a possible implementation, φ(i,n) is

number

number

number

number

[0051] With reference to the third or fourth aspect, in a possible implementation, the smaller the value of Pri(l,i,f,n), the higher the priority of the coefficient corresponding to a given sequence number combination of the lth transmission layer, the nth reference signal resource, the ith spatial domain basis vector or reference signal port, and the fth frequency domain basis vector.

[0052] With reference to the third or fourth aspect, in a possible implementation, the priorities of the N reference signal resources are determined as follows: A reference signal resource corresponding to a larger number of spatial domain basis vectors or a reference signal resource from which a larger number of reference signal ports are selected has a higher priority. The reference signal resource corresponding to the larger amplitude of the strongest coefficient has a higher priority. A reference signal resource corresponding to a higher signal strength of the reference signal has a higher priority, or A reference signal resource corresponding to a lower sequence number of the reference signal resource has a higher priority. The decision is made according to one or more of the second preset rules:

[0053] With reference to the third or fourth aspect, in a possible implementation, the smaller the value of G(n), the higher the priority of the nth reference signal resource.

[0054] With reference to the third or fourth aspect, in a possible implementation, the indication of the coefficients comprises one or more of: an indication of the amplitude of the coefficients; an indication of the phase of the coefficients; and an indication of the position of the coefficients.

[0055] With reference to the third or fourth aspect, in a possible implementation, the smaller the value of φ(i,n), the higher the priority of the coefficient set associated with the i-th spatial domain basis vector or reference signal port corresponding to the n-th reference signal resource.

[0056] With reference to the third or fourth aspect, in a possible implementation, when a preset condition is satisfied, the priorities of the M coefficients are determined based on a function corresponding to the preset condition among the preset functions, the preset function being:

number

[0057] According to a fifth aspect, the present application provides a communications device. The communications device may include a processor, a transceiver, and a memory. The memory is configured to store a computer program. The transceiver is configured to send and receive various messages. The computer program includes program instructions. When the processor executes the program instructions, the communications device can perform a method according to the first aspect, the second aspect, or any one of possible implementations of the first or second aspect. The transceiver may be a radio frequency module, a combination of a radio frequency module and an antenna, or an input / output interface of a chip or circuit within the communications device.

[0058] According to a sixth aspect, the present application provides a readable storage medium having stored thereon program instructions that, when executed by a computer, cause the computer to perform a method according to the first aspect, the second aspect, or any one of possible implementations of the first or second aspect.

[0059] According to a seventh aspect, the present application provides a program product comprising program instructions which, when executed, perform a method according to the first aspect, the second aspect, or any one of the possible implementations of the first or second aspect.

[0060] According to an eighth aspect, the present application provides an apparatus. The apparatus may be implemented in the form of a chip or a device. The apparatus includes a processor. The processor is configured to read and execute a program stored in a memory to perform a channel state information reporting method according to the first aspect, the second aspect, or any one of possible implementations of the first aspect or the second aspect. Optionally, the apparatus further includes a memory, the memory being connected to the processor through a circuit. Optionally, the apparatus further includes a communication interface, the processor being connected to the communication interface. The communication interface is configured to receive data packets to be processed and / or information to be processed. The processor obtains the data packets and / or information from the communication interface, processes the data packets and / or information, and outputs the processing result via the communication interface. The communication interface may be an input / output interface.

[0061] Optionally, the processor and memory may be physically separate from each other, or the memory may be integrated with the processor.

[0062] According to a ninth aspect, the present application provides a wireless communication system, including a terminal device and a network device, wherein the terminal device is configured to perform a method according to the first aspect or any one of its possible implementations, and the network device is configured to perform a method according to the second aspect or any one of its possible implementations.

[0063] For the technical effects achieved in the above aspects, please refer to each other or to the advantageous effects in the following method embodiments, and the details will not be described again here.

[0064] To describe the technical solutions in the embodiments or background of the present application more clearly, the following will briefly describe the accompanying drawings to describe the embodiments or background of the present application. [Brief explanation of the drawings]

[0065] [Figure 1a] 1 is a diagram of an architecture of a communication system according to an embodiment of the present application; [Figure 1b] FIG. 2 is a diagram of another architecture of a communication system according to an embodiment of the present application; [Figure 2] 1 is a schematic diagram of the structure of a UE and a base station according to an embodiment of the present application; [Figure 3a] 10 is a schematic flowchart illustrating a base station acquiring CSI of a downlink channel. [Figure 3b] FIG. 2 is a diagram of a precoding matrix for a channel according to an embodiment of the present application. [Figure 4] 1 is a schematic flowchart of a channel state information reporting method according to an embodiment of the present application; [Figure 5] FIG. 1 is a diagram of frequency domain basis vector cyclic shift according to an embodiment of the present application. [Figure 6] FIG. 1 is a diagram of a priority definition in which spatial domain and reference signal resources are combined, according to an embodiment of the present application. [Figure 7] 1 is a diagram of the structure of a communication device according to an embodiment of the present application; [Figure 8] FIG. 2 is a diagram of the structure of another communication device according to an embodiment of the present application; [Figure 9] FIG. 2 is a diagram of the structure of another communication device according to an embodiment of the present application; [Figure 10] 1 is a diagram of the structure of yet another communication device according to an embodiment of the present application; DETAILED DESCRIPTION OF THE INVENTION

[0066] The following clearly and completely describes the technical solutions in the embodiments of the present application with reference to the accompanying drawings in the embodiments of the present application.

[0067] In this specification, terms such as "first" and "second" are merely intended to distinguish between different objects and do not limit the quantity or order of execution. Terms such as "first" and "second" do not indicate a clear distinction. For example, the terms "first remapping function" and "second remapping function" are merely intended to distinguish between different information and do not limit the order of execution. Furthermore, words such as "comprise," "have," and any other variations thereof are intended to cover a non-exclusive inclusion. For example, a process, method, system, product, or device that includes a series of steps or units is not limited to the listed steps or units, and may optionally include additional steps or units not listed, or may optionally include other steps or units inherent to the process, method, product, or device.

[0068] In this specification, unless otherwise specified, " / " indicates "or." For example, A / B may refer to A or B. The term "and / or" in this specification simply indicates an association relationship between related objects and indicates that three relationships may exist. For example, A and / or B may represent three cases: A alone exists, both A and B exist, or B alone exists. Furthermore, "at least one moiety (item)," "one or more of the following items (moieties)," or similar expressions refer to any combination of these items, including any combination of a single item (moiety) or multiple items (moieties). For example, at least one item (moiety) of a, b, or c may represent a, b, c, a and b, a and c, b and c, or a, b, and c. Each of a, b, and c may be singular or plural.

[0069] As used herein, the words "for example" or "example" and the like denote serving as an example, illustration, or description. Any embodiment or design described herein as an "example," "such as," or "for example" should not be described as being more preferred or having more advantages than another embodiment or design. Strictly speaking, the use of words such as "for example," "such as," "for example," and the like is intended to present the relevant concept in a particular way.

[0070] It can be understood that in the specification of this application, "when," "if," and "assuming" all mean that the device performs the corresponding processing in an objective case, are not intended to limit the time, do not mean that the device must have a decision-making action during execution, and do not mean any other limitation.

[0071] In this application, "simultaneously" may be understood as being at the same time, within a certain period of time, or within the same cycle, and may be specifically understood with reference to the context.

[0072] As used herein, the terms "a," "an," and "the" are intended to mean "one or more" and not "one" unless otherwise specified.

[0073] Additionally, the terms "system" and "network" may be used interchangeably herein.

[0074] In the embodiments of the present application, "B corresponding to A" indicates that B is associated with A, and B may be determined based on A. However, it should be further understood that determining B based on A does not mean that B is determined based only on A. B may alternatively be determined based on A and / or other information.

[0075] In the embodiments of the present application, it may be understood that "indication" may include direct indication and indirect implementation, or may include explicit indication and implicit indication. When "indication information indicates A" or "indication information of A" is described, the indication information may directly indicate A or indirectly indicate A, but does not necessarily mean that the indication information explicitly conveys A. Information indicated by information (e.g., in the following description, indication information of a coefficient) is referred to as referent information. In a specific implementation, referent information may be indicated in multiple ways, including but not limited to directly indicating the referent information, for example, indicating the referent information or an index of the referent information. Alternatively, referent information may be indirectly indicated by indicating other information, and there is an association relationship between the other information and the referent information. Alternatively, only a part of the referent information may be indicated, and the remaining part of the referent information is known or agreed upon in advance. For example, specific information may alternatively be indicated using a pre-agreed (e.g., protocol-defined) arrangement order of multiple pieces of information, so as to reduce indication overhead to a certain extent. Furthermore, common parts of various pieces of information may be further identified and indicated in a unified manner so as to reduce the indication overhead caused by separately indicating the same information. Furthermore, the specific indication manner may alternatively be, for example, an existing indication manner, but is not limited to the above indication manners and various combinations thereof. For details of various indication manners, please refer to the prior art. Details will not be described in this specification. As can be seen from the above description, for example, when multiple pieces of information of the same type need to be indicated, different pieces of information may be indicated in different manners. In a specific implementation, the required indication information may be selected based on specific requirements. The selected indication manner is not limited in the embodiments of the present application. In this way, it should be understood that the indication manner in the embodiments of the present application encompasses various methods that can enable the referred party to know the referred information. The referred information may be transmitted as a whole, or may be divided into multiple sub-information for separate transmission.Furthermore, the transmission period and / or transmission occasion of these sub-information may be the same or different. The specific transmission method is not limited in this application. The transmission period and / or transmission occasion of these sub-information may be predefined, for example, predefined according to a protocol, or may be configured by the transmitting end device by sending configuration information to the receiving end device. For example, the configuration information may include, but is not limited to, one or a combination of at least two of radio resource control signaling, MAC layer signaling, and physical layer signaling.

[0076] The technical solutions in the embodiments of the present application may be applied to various communication systems, such as long term evolution (LTE) systems, worldwide interoperability for microwave access (WiMAX) communication systems, fifth generation (5G) systems, new generation radio (NR) systems, networks incorporating multiple systems, Internet of Things systems, vehicle-to-everything systems, and future communication systems such as 6G systems.

[0077] It should be understood that the network architectures described in the embodiments of the present application are intended to more clearly describe the technical solutions in the embodiments of the present application, and do not constitute limitations on the technical solutions provided in the embodiments of the present application. Those skilled in the art may recognize that as network architectures evolve, the technical solutions provided in the embodiments of the present application may also be applicable to similar technical problems.

[0078] In the embodiments of the present application, an NR network scenario in a wireless communication network is used as an example to describe some scenarios. Note that the solutions in the embodiments of the present application may also be applied to other wireless communication networks, and the corresponding names may also be replaced with the names of corresponding functions in other wireless communication networks.

[0079] 1a is a diagram of an architecture of a communication system according to an embodiment of the present application. As shown in FIG. 1a, the communication system includes a radio access network 100. The radio access network 100 may include at least one radio access network device (e.g., 110a and 11b in FIG. 1a) and may further include at least one terminal device (e.g., 120a-120j in FIG. 1a). The terminal device may be connected to the radio access network device in a wireless manner. The terminal devices may be connected to each other in a wired or wireless manner, and the radio access network devices may be connected to each other in a wired or wireless manner.

[0080] A radio access network device, sometimes abbreviated as a network device, is an access device used by terminals to wirelessly access a communication system. A radio access network device may be a base station (BS), an evolved NodeB (eNodeB), a transmission reception point (TRP), a next-generation NodeB (gNB) in a fifth-generation (5G) mobile communication system, a next-generation base station in a sixth-generation (6G) mobile communication system, a base station in a future mobile communication system, or an access node in a wireless fidelity (Wi-Fi) system. Alternatively, a radio access network device may be a module or unit that implements some of the functions of a base station, such as a central unit (CU) or a distributed unit (DU). A base station including a CU and a DU can also be referred to as a base station in which the CU and DU are separated. For example, a base station includes a gNB-CU and a gNB-DU. The CU may be further separated into a CU control plane (CU-CP) and a CU user plane (CU-CP). For example, a base station includes a gNB-CU-CP, a gNB-CU-UP, and a gNB-DU. The CU here may implement the functions of the base station's radio resource control protocol and packet data convergence protocol (PDCP), and may also implement the functions of the service data adaptation protocol (SDAP). The DU may implement the functions of the base station's radio link control layer and medium access control (MAC) layer, and may also implement some or all of the functions of the physical layer.For a detailed description of the aforementioned protocol layers, please refer to the technical specifications related to the 3rd Generation Partnership Project (3GPP). The radio access network device may be a macro base station (e.g., 110a in FIG. 1a), a micro base station or an indoor base station (e.g., 110b in FIG. 1a), or may be a relay node, a donor node, etc. The specific technology and specific device form used for the radio access network device are not limited in the embodiments of the present application. For simplicity, the following uses an example in which the base station is a radio access network device for explanation. It may be understood that in the embodiments of the present application, one base station may correspond to one TRP, or one TRP may also be referred to as one base station.

[0081] In the embodiments of the present application, the apparatus configured to implement the functions of the network device may be a network device, or may be an apparatus capable of supporting the network device to implement the functions, such as a chip system, a communication module, or a modem. The apparatus may be installed in the network device. In the technical solutions provided in the embodiments of the present application, the technical solutions are described by using an example in which the apparatus configured to implement the functions of the network device is a network device, and the network device is a base station. The base station may support a network using the same access technology or different access technologies. The specific technologies and specific device forms used in the network device are not limited in the embodiments of the present application.

[0082] A terminal device is a device with wireless transceiver capabilities that can transmit signals to and receive signals from a base station. A terminal device may also be referred to as a terminal, user equipment (UE), mobile station, mobile terminal, etc. Terminal devices can be widely used in various scenarios, such as device-to-device (D2D), vehicle-to-everything (V2X) communication, machine-type communication (MTC), Internet of Things (IoT), virtual reality, augmented reality, industrial control, autonomous driving, telemedicine, smart grid, smart furniture, smart office, smart wearable, smart transportation, and smart city. A terminal may be a mobile phone, a tablet computer, a computer with wireless transceiver capabilities, a wearable device, a vehicle, an airplane, a ship, a robot, a robotic arm, a smart home device, etc. The specific technology and device configuration used for the terminal are not limited in the embodiments of this application.

[0083] The base station and the terminal may be in a fixed location or may be mobile. The base station and the terminal may be deployed on the ground, in which case the deployment may be indoors or outdoors, or handheld or vehicle-mounted, or may be deployed on water, or may be deployed on an airplane, a balloon, or a satellite. The application scenario of the base station and the terminal is not limited in the embodiments of the present application.

[0084] The roles of a base station and a terminal may be relative. For example, the helicopter or unmanned aerial vehicle in FIG. 1a may be configured as a mobile base station. For terminal 120j accessing the wireless access network 100 via 120i, terminal 120i is a base station. However, for base station 110a, 120i is a terminal. In other words, communication between 110a and 120i is performed according to a wireless air interface protocol. Indeed, communication between 110a and 120i may alternatively be performed according to an interface protocol between base stations. In this case, for 110a, 120i is also a base station. Therefore, both base stations and terminals can be collectively referred to as communication devices, and 110a and 110b in FIG. 1a can be referred to as communication devices with base station functions, and 120a to 120j in FIG. 1a can be referred to as communication devices with terminal functions.

[0085] Communication between base stations and terminals, between base stations, or between terminals may occur using licensed spectrum, unlicensed spectrum, or both licensed and unlicensed spectrum. Communication may occur using spectrum below 6 gigahertz (GHz), above 6 GHz, or both below and above 6 GHz.

[0086] In the embodiments of the present application, a device configured to implement the functions of a terminal may be a terminal, or may be a device capable of supporting a terminal in implementing the functions, such as a chip system, a communication module, or a modem. The device may be installed in a terminal. In the embodiments of the present application, the chip system may include a chip, or may include a chip and other discrete components. In the technical solutions provided in the embodiments of the present application, the technical solutions are described using an example in which the device configured to implement the functions of a terminal is a terminal, and the terminal is a UE. The specific technology and specific device form used in the terminal device are not limited in the embodiments of the present application.

[0087] In some scenarios, the UE may alternatively be configured as a base station, e.g., the UE may act as a scheduling entity providing sidelink signaling between UEs in vehicle-to-everything (V2X), device-to-device (D2D), peer-to-peer (P2P), etc.

[0088] In some scenarios, the UE may alternatively be configured as a relay node, e.g., the UE may function as a relay or integrated access and backhaul (IAB) node and be configured to provide wireless backhaul services to terminal devices.

[0089] 1b is a diagram of another architecture of a communication system according to an embodiment of the present application. Multiple base stations (e.g., base station 1, base station 2, and base station 3) and multiple UEs (e.g., UE1, UE2, and UE3) form a system. Multiple base stations (e.g., base station 1, base station 2, and base station 3) can simultaneously serve one UE (e.g., UE2). UEs can be connected to the base stations in a wireless manner. UEs can be connected to each other in a wired or wireless manner, and base stations can be connected to each other in a wired or wireless manner.

[0090] Optionally, in FIG. 1a and FIG. 1b, one or more antennas may be configured for the terminal device for transmitting and receiving data / information. Similarly, one or more antennas may also be configured for the network device for transmitting and receiving data / information. It may be understood that the network device and the terminal device may further include multiple components (e.g., a processor, a modulator, a multiplexer, a demodulator, or a demultiplexer) related to transmitting and receiving data / information. Furthermore, it may be understood that FIG. 1a and FIG. 1b are merely illustrations. The communication system may further include other devices, for example, a core network device, a wireless relay device, and / or a wireless backhaul device, which are not shown in FIG. 1a and FIG. 1b. Furthermore, it may be understood that FIG. 1a and FIG. 1b are merely examples, and the number of network devices and terminal devices included in the communication system is not limited in the embodiments of the present application.

[0091] In embodiments of the present application, the term "wireless communication" may be abbreviated to "communication," and the term "communication" may alternatively be described as "data transmission," "information transmission," or "transmission."

[0092] FIG. 2 is a schematic diagram of the structure of a UE and a base station according to an embodiment of the present application. For simplicity, FIG. 2 only shows the main components of a base station 110 and a UE 120. In actual applications, the structures of a base station and a UE may have more or fewer components than those shown in FIG. 2, or may include only the components shown in FIG. 2. The base station shown in FIG. 2 may use an architecture in which the CU and DU are separated, or may use an architecture in which the CU and DU are not separated. The following briefly describes each component in FIG. 2.

[0093] The base station 110 includes an interface 111 and a processor 112. The processor 112 may optionally store a program 114. The base station 110 may optionally include a memory 113. The memory 113 may optionally store a program 115. The UE 120 includes an interface 121 and a processor 122. The processor 122 may optionally store a program 124. The UE 120 may optionally include a memory 123. The memory 123 may optionally store a program 125. These components cooperate to provide various functions described herein. For example, the processor 112 and the interface 111 cooperate to provide a wireless connection between the base station 110 and the UE 120. The processor 122 and the interface 121 cooperate to implement downlink and / or uplink transmissions for the UE 120.

[0094] A processor (e.g., processor 112 and / or processor 122) may include one or more processors and may be implemented as a combination of computing devices. A processor (e.g., processor 112 and / or processor 122) may include one or more of the following: a microprocessor, a microcontroller, a digital signal processor (DSP), a digital signal processing device (DSPD), an application-specific integrated circuit (ASIC), a field programmable gate array (FPGA), a programmable logic array (PLD), gating logic, transistor logic, discrete hardware circuits, processing circuits, or other suitable hardware, firmware, and / or a combination of hardware and software to perform various functions described herein. A processor (e.g., processor 112 and / or processor 122) may be a general-purpose processor or a special-purpose processor. For example, processor 112 and / or processor 122 may be a baseband processor or a central processing unit. The baseband processor may be configured to process communication protocols and communication data. The central processing unit may be configured to enable the base station 110 and / or the UE 120 to execute software programs and process data in the software programs.

[0095] An interface (e.g., interface 111 and / or interface 121) may be configured to facilitate communication with one or more computing devices (e.g., UEs, BSs, and / or network nodes). In some embodiments, an interface may include wires for coupling a wired connection, or pins for coupling a wireless transceiver, or chips and / or pins for wireless connections. In some embodiments, an interface may include a transmitter, a receiver, a transceiver, and / or an antenna. An interface may be configured to use any available protocol (e.g., 3GPP standards).

[0096] Programs herein broadly refer to software. Non-limiting examples of software include program code, programs, subprograms, instructions, instruction sets, code, code segments, software modules, application programs, or software application programs. Programs may be executed by a processor and / or computer to cause the base station 110 and / or UE 120 to perform various functions and / or processes described herein.

[0097] Memory (e.g., memory 113 and / or memory 123) may store data manipulated by processors 112 and 122 during execution of software. Memory 113 and 123 may be implemented using any storage technology. For example, memory may be any available storage medium that can be accessed by the processor and / or computer. Non-limiting examples of storage media include RAM, ROM, EEPROM, CD-ROM, removable media, optical disk memory, magnetic disk storage media, magnetic storage devices, flash memory, registers, state memory, remotely implemented memory, local or remote storage components, or any other medium that can carry or store software, data, or information and that can be accessed by the processor / computer.

[0098] The memory (e.g., memory 113 and / or memory 123) and the processor (e.g., processor 112 and / or processor 122) may be located separately or integrated together. The memory may be configured to be coupled to the processor such that the processor can read information from, store information in, and / or write information to the memory. Memory 113 may be integrated into processor 112. Memory 123 may be integrated into processor 122. The processor (e.g., processor 112 and / or processor 122) and the memory (e.g., memory 113 and / or memory 123) may be located in an integrated circuit (e.g., the integrated circuit may be located in a UE, a base station, or other network node).

[0099] Optionally, the components in the base station 110 and the UE 120 may alternatively be present in the form of various exchange modules, such as a radio resource control (RRC) signaling exchange module, specifically a module used by the base station 110 and the UE 120 for transmitting and receiving RRC signaling; a MAC signaling module, specifically a module used by the base station 110 and the UE 120 for transmitting and receiving medium access control-control element (MAC-CE) signaling; and a PHY signaling and data exchange module, specifically a module used by the base station 110 and the UE 120 for transmitting and receiving uplink / downlink control signaling and uplink / downlink data.

[0100] The communication system architecture to which the embodiments of the present application can be applied is described above. In order to better understand the technical solutions in the embodiments of the present application, the following will briefly explain some terms or nouns related to the present application, to help those skilled in the art have a better understanding.

[0101] 1. Downlink channel CSI measurement

[0102] In an FDD system, a UE needs to report CSI of a downlink channel to a base station. The basic procedure is shown in FIG. 3a. FIG. 3a is a schematic flowchart illustrating how a base station acquires CSI of a downlink channel. First, the base station needs to send channel measurement configuration information to the UE to configure channel measurement-related parameters for the UE, such as resources used for channel measurement, channel measurement time, and channel measurement operation. Next, the base station sends a channel measurement pilot (i.e., a reference signal) to the UE for the UE to perform channel measurement. The UE measures the received channel measurement pilot and determines CSI, and finally, the CSI needs to be reported. Finally, the UE reports the CSI to the base station, and the base station performs precoding on the downlink data and then determines precoding information for the downlink data based on the CSI reported by the UE to transmit the downlink data.

[0103] It can be understood that some information of the uplink channel and the downlink channel in an FDD system has interdependence, for example, angle interdependence and delay interdependence. Therefore, a downlink CSI acquisition solution for an FDD system can be designed based on the angle interdependence and delay interdependence. For example, a base station may first perform channel estimation for the uplink channel, and then obtain some prior information of the downlink channel, for example, angle and delay information of the downlink channel, based on the estimated uplink channel information. The base station may then load the angle and delay information of the downlink channel into a downlink channel measurement pilot, for example, perform precoding on the downlink channel measurement pilot by using the angle and delay information of the downlink channel. The base station may then transmit the precoding-processed channel measurement pilot to the UE, and the UE may perform channel measurement on the channel measurement pilot to obtain downlink equivalent channel information (specifically, the channel information of the precoding-processed channel measurement pilot), and report other information (specifically, information other than the angle and delay information of the downlink channel) used to determine precoding information to the base station based on the downlink equivalent channel information. Finally, the base station may determine precoding information based on the a priori information determined by the uplink channel estimation and other information reported by the UE to perform precoding on the downlink data and then transmit the downlink data.

[0104] 2.CSI report

[0105] After completing downlink channel measurements, the UE may report CSI by using uplink control information (UCI). The CSI included in the CSI report may be divided into two parts, typically referred to as Part 1 and Part 2. The overhead of Part 1 is generally fixed, and the overhead of Part 2 may typically be determined based on the amount of reporting in Part 1. For example, the reporting overhead of coefficient amplitude and phase indication information in Part 2 may be determined based on the total number of coefficients reported in Part 1 corresponding to all transmission layers.

[0106] In the case of an enhanced Type-II codebook (referred to as Rel-16 eType-II codebook) in TS 38.214 Release 16, Part 1 may typically include a channel rank indicator (RI), a channel quality indicator (CQI), and the number of coefficients reported for all transmission layers (i.e., a layer, the number of transmission layers may be determined based on the RI, and a transmission layer may also be referred to as a layer, a spatial layer, a data layer, or a data stream), and Part 2 may include spatial-domain basis vector indication information, a spatial-domain oversampling factor, a frequency-domain basis vector indication information, strongest coefficient indication information, coefficient position indication information (usually a bitmap, which indicates the positions of the reported coefficients), and the amplitude and phase of the quantized coefficients. Typically, the total number of coefficients reported for all transmission layers in Part 1 and Part 2 may also be referred to as a precoding matrix indicator (PMI). In the case of a further enhanced Type-II port selection codebook in TS 38.214 Release 17 (hereinafter referred to as the Rel-17 FeType-II codebook for short), Part 1 is the same as Part 1 of the Rel-16 eType-II codebook, but Part 2 may include port selection indicator information, frequency-domain basis vector indicator information, strongest coefficient indicator information, coefficient position indicator information, and the amplitude and phase of quantized coefficients. In other words, comparing Part 2 of the Rel-17 FeType-II codebook with Part 2 of the Rel-16 eType-II codebook, the spatial-domain basis vector indicator information and spatial-domain oversampling factor in Part 2 of the Rel-16 eType-II codebook are replaced with port selection indicator information.

[0107] The base station may determine a precoding matrix based on the CSI reported by the UE. Note that if the overhead of the CSI reported by the UE exceeds the size of the resources (e.g., physical uplink shared channel (PUSCH)) allocated by the base station, the UE needs to discard some of the CSI to ensure effective transmission of important CSI. For example, a protocol may specify that the CSI to be reported be grouped based on different priorities. When resources are insufficient, the UE may sequentially discard some of the CSI for each group based on priority, typically discarding CSI with a lower priority. For coefficient amplitude, phase, and coefficient position indication information, a coefficient reporting priority calculation method may be defined in the protocol, and the method is used as part of the basis for priority-based CSI grouping.

[0108] 3.PMI reporting

[0109] PMI reports can usually be determined and reported based on a set of codebooks, and a three-tiered codebook is usually used, for example:

number

[0110] For scenarios where Rel-16 eType-II codebook, i.e., Part 2 includes spatial domain basis vector indication information and spatial domain oversampling factor,

number

number

number

[0111] For example, for each transmission layer, the dimension of the precoding matrix W to be reported is P×N3. Figure 3b is a diagram of a channel precoding matrix according to an embodiment of the present application. As shown in Figure 3b, the precoding matrix can be decomposed into three matrices to be multiplied. For ease of description, the three matrices are referred to as the spatial domain matrix, the coefficient matrix, and the frequency domain matrix, respectively (e.g., in Figure 3b, spatial domain matrix 1, coefficient matrix 1, and frequency domain matrix 1). The dimension of spatial domain matrix 1 is P×P and is a block diagonal matrix. The two diagonal matrices correspond to two polarization directions, respectively, and are matrices corresponding to the entire set of spatial domain basis vectors with dimensions P / 2×P / 2, which includes P / 2 spatial domain basis vectors. The dimension of coefficient matrix 1 is P×N3, and the dimension of frequency domain matrix 1 is N3×N3, i.e., a matrix corresponding to the entire set of frequency domain basis vectors. Since there are a large number of coefficients with small values ​​in coefficient matrix 1, dimension reduction can be performed on three matrices, namely, spatial domain matrix 1, coefficient matrix 1, and frequency domain matrix 1. For example, the spatial domain basis vectors and frequency domain basis vectors corresponding to the coefficients with large values ​​in coefficient matrix 1 are reserved. For example, to obtain P×2L-dimensional spatial domain matrix 2, 2L spatial domain basis vectors are selected from P×P-dimensional spatial domain matrix 1 (the same L spatial domain basis vectors are selected for each polarization direction). M v To obtain the N3 × N3 spatial domain matrix 2, we first convert the N3 × N3 frequency domain matrix 1 into the M v The selected 2L frequency domain basis vectors and the selected M v 2L×M corresponding to the frequency domain basis vectors v The coefficients are 2L×M v To obtain a P×N-dimensional coefficient matrix, a certain number of coefficients are determined from the P×N-dimensional coefficient matrix 1. Then, a certain number of coefficients are determined from the 2L×M-dimensional coefficient matrix 2 for quantization. v The spatial domain basis vector indication information in the PMI indicates specific L spatial domain basis vectors selected from the entire set of spatial domain basis vectors, and the frequency domain basis vector indication information for each transmission layer indicates specific M spatial domain basis vectors selected from the entire set of frequency domain basis vectors.v The coefficient indication information for each transmission layer is 2L × M v The position of the selected coefficient among the coefficients and the amplitude and phase of the quantized selected coefficient are indicated.

[0112] For scenarios where the Rel-17 FeType-II codebook, i.e., Part 2 contains port selection instruction information,

number

number

number

[0113] In the CJT cooperation scheme, multiple TRPs can simultaneously serve one UE, and multiple TRPs can be equivalent to one large base station for the UE. Therefore, the UE needs to report joint channel state information to all TRPs in the multi-station cooperation set to enable coherent joint transmission. In possible implementations, for the codebook format in the CJT cooperation scheme, please refer to the following two CJT codebook formats (N is the number of TRPs selected by the UE for CJT):

number

[0114] Similar to the codebook structure described above, for each transmission layer, W 1,n is the spatial domain matrix or port selection matrix of the n-th TRP, with dimensions P × 2L n or P x K 1,n and

number

number

number

number

[0115] Compared with the Rel-16 eType-II codebook and the Rel-17 FeType-II codebook, the aforementioned CJT codebook introduces the TRP dimension and contains integrated CSI information for multiple TRPs.

[0116] Note that each TRP may correspond to one reference signal resource (e.g., CSI-RS resource), or each TRP may correspond to one port group on one reference signal resource (e.g., CSI-RS resource). In other words, in this application, there is a correspondence between reference signal resources and TRPs, and one reference signal resource may represent one TRP. For example, a reference signal resource is a time-frequency resource used to transmit a reference signal and includes one or more reference signal ports.

[0117] In this application, CSI may be channel state information and represent a channel. The CSI may be a channel response, or an eigenvector of the channel or a matrix formed by multiple eigenvectors. The CSI is obtained by a communication device by performing channel measurements. For example, the CSI is obtained by a UE by measuring a reference signal. Alternatively, the CSI may be a result obtained after processing the channel response obtained by the communication device by performing channel measurements, for example, a channel eigenvector obtained by performing singular value decomposition on the channel response obtained by performing channel measurements. This is not a limitation of this application.

[0118] 4. Spatial domain basis vectors

[0119] Each spatial domain basis vector corresponds to one transmit beam of the transmitting end device (corresponding to the TRP), and each element of the spatial domain basis vector can be represented as a weight for each antenna port. Based on the weights for all antenna ports represented by all elements in the spatial domain basis vector, the signals of all antenna ports are linearly superimposed to form a region with strong signals in a certain direction in space. Optionally, the spatial domain basis vectors can be obtained from a two-dimensional discrete Fourier transform (DFT) matrix, and the two-dimensional DFT matrix is ​​a set of spatial domain basis vectors. In other words, the spatial domain basis vectors can be two-dimensional DFT vectors, which can usually be used to describe beams obtained by superimposing horizontal and vertical beams. The dimension of the spatial domain basis vector is N1*N2×1, in other words, the spatial domain basis vector contains N1*N2 elements, where N1 and N2 are the numbers of horizontal and vertical transmit antenna ports of the transmitting end device in one polarization direction, respectively. In this case, the universal set of spatial domain basis vectors contains N1*N2 spatial domain basis vectors. When PMI is reported, L spatial domain basis vectors are selected from the N1*N2 spatial domain basis vectors to represent the spatial domain characteristics of the channel.

[0120] 5. Frequency Domain Basis Vectors

[0121] Frequency-domain basis vectors, also called frequency-domain vectors, are vectors that can represent the change rules of a channel in the frequency domain. Each frequency-domain basis vector can represent one change rule. When a signal is transmitted through a wireless channel, the signal may arrive at a receiving antenna from a transmitting antenna via multiple paths. Frequency-selective fading caused by delays on multiple paths is a change in the frequency-domain channel. Therefore, change rules of the channel in the frequency domain caused by delays on different transmission paths can be represented by using different frequency-domain basis vectors. Optionally, the frequency-domain basis vectors can be selected from a DFT matrix or an inverse discrete Fourier transform (IDFT) matrix, and the DFT matrix or the IDFT matrix (i.e., the conjugate transpose of the DFT matrix) is the entire set of frequency-domain basis vectors. In other words, the frequency-domain basis vectors can be DFT vectors or IDFT vectors.

[0122] The length of the frequency domain basis vectors may be determined based on the number of frequency domain units to be reported, which is preset in the reporting bandwidth, or based on the length of the reporting bandwidth, or may be a value predefined in the protocol. The length of the frequency domain basis vectors is not limited in this application. The reporting bandwidth may be the CSI reporting bandwidth (CSI-ReportingBand) carried in the CSI reporting configuration in higher layer signaling (e.g., an ARC message). When the dimension of the frequency domain basis vectors is N3 × 1, the whole set of frequency domain basis vectors includes N3 frequency domain basis vectors. When PMI is reported, M v N frequency-domain basis vectors are selected from the N3 frequency-domain basis vectors.

[0123] 6. Linear combination coefficients

[0124] The linear combination coefficients may also be referred to as coefficients, weighting coefficients, etc. In the case of single-station transmission, a single-TRP precoding matrix is ​​reported by using a PMI. In the case of multi-station coherent transmission, a multi-TRP joint precoding matrix is ​​reported by using a PMI, and the precoding matrix corresponding to each TRP or each reference signal resource is a sub-matrix of the multi-TRP joint precoding matrix. When a PMI is reported, the above codebook essentially represents, for each transmission layer, the precoding matrix or precoding sub-matrix corresponding to each TRP for that transmission layer by using several spatial-domain basis vectors and several frequency-domain basis vectors in a linear weighted format, where the weighting coefficients are linear combination coefficients. For each transmission layer and each reference signal resource, multiple linear combination coefficients are included, and each linear combination coefficient corresponds to one spatial-domain basis vector and one frequency-domain basis vector. In the case of a port selection codebook (e.g., a Rel-17 FeType-II codebook or a multi-station codebook based on the Rel-17 FeType-II codebook), multiple linear combination coefficients are included for each transmission layer and each reference signal resource, and each linear combination coefficient corresponds to one reference signal port and one frequency-domain basis vector. When PMI is reported, some coefficients are selected for reporting from all linear combination coefficients corresponding to all transmission layers and all reference signal resources. Typically, the amplitude of the reported coefficients is not 0, and the coefficients may also be called non-zero coefficients.

[0125] 7.Transmission Layer

[0126] A transmission layer may also be referred to as a layer, a spatial layer, a data layer, a data stream, etc. In a multiple-input multiple-output (MIMO) system, a transmission layer may be considered as a data stream that may be transmitted independently, and each transmission layer may have one transmission layer sequence number. To improve spectral resource utilization and increase the data transmission capacity of a communication system, a network device may transmit data to a terminal device through multiple transmission layers.

[0127] The number of transmission layers is the rank of the channel matrix. The terminal device may determine the number of transmission layers based on the channel matrix obtained by channel estimation. It may be understood that the UE may determine the precoding matrix based on the channel matrix. For example, the UE may determine the precoding matrix by performing singular value decomposition (SVD) on the channel matrix or the covariance matrix of the channel matrix. In the SVD process, different transmission layers may be distinguished based on eigenvalues. For example, the UE may assign a precoding vector determined by using the eigenvector corresponding to the largest eigenvalue to the first transmission layer, and assign a precoding vector determined by using the eigenvector corresponding to the smallest eigenvalue to the vth transmission layer. In other words, the eigenvalues ​​corresponding to the first to vth transmission layers are in descending order. Simply put, among the v transmission layers, the strengths of the first to last transmission layers are in descending order.

[0128] It may be understood that the reference signal in this application may be one or more of the following: CSI-RS, SSB, and demodulation reference signal (DMRS), and the reference signal resource in this application may be one or more of the following: CSI-RS resource, SSB resource, and DMRS resource. The channel to be measured may be a physical downlink shared channel (PDSCH) or a physical downlink control channel (PDCCH).

[0129] In the prior art, the design principles of coefficient priority are similar for the Rel-16 eType-II codebook and the Rel-17 FeType-II codebook. Specifically, given a sequence number combination (l,i,f), the priority of the coefficient corresponding to the combination can be expressed as Pri(l,i,f). The smaller the value of Pri(l,i,f), the higher the priority of the coefficient corresponding to the combination, and the higher the priority of the indicator information such as amplitude, phase, and position indicator information of the coefficient with higher priority can be reported preferentially. In other words, the higher the priority of the coefficient, the higher the position of the indicator information such as amplitude, phase, and position indicator information of the coefficient in the CSI report field. The transmission layer sequence number is l, where l = 1, 2, ..., v; the sequence number of the spatial domain basis vector or selected reference signal port is i, where i = 0, 1, ..., 2L-1 or i = 0, 1, ..., K1-1; the frequency domain basis vector sequence number is f, where f = 0, 1, ..., M v −1, v is the total number of transmission layers, L is the number of polarization-shared spatial domain basis vectors, K1 is the number of selected reference signal ports, and M v is the number of frequency domain basis vectors.

[0130] For the Rel-16 eType-II codebook, Pri(l,i,f) = 2 L v π(f) + v i + l. It can be seen that changing the values ​​of f, i, and l have different effects on Pri(l,i,f). The coefficient reporting priority for the Rel-16 eType-II codebook can be defined as follows: first, the frequency domain dimension and spatial domain dimension are fixed, and coefficients corresponding to different transmission layers are reported; then, the frequency domain dimension is fixed, and coefficients corresponding to different spatial domain basis vectors are reported; and finally, coefficients corresponding to different frequency domain basis vectors are reported.

[0131] For the Rel-17 FeType-II codebook, Pri(l,i,f) = K1·v·f+v·i+l. Similarly, it can be seen that changing the values ​​of f, i, and l have different effects on Pri(l,i,f). The coefficient reporting priority for the Rel-17 FeType-II codebook can be defined as follows: first, the frequency-domain dimensions and reference signal port dimensions are fixed, and coefficients corresponding to different transmission layers are reported; then, the frequency-domain dimensions are fixed, and coefficients corresponding to different reference signal ports are reported; and finally, coefficients corresponding to different frequency-domain basis vectors are reported.

[0132] However, this solution cannot be applied to the multi-TRP joint transmission CJT scenario. Specifically, currently, the Rel-16 eType-II codebook and the Rel-17 FeType-II codebook only consider the coefficient priority definition during CSI reporting for a single TRP, and do not consider the coefficient priority definition during CSI reporting in multi-TRP joint transmission. In the case of the CJT codebook, multiple TRPs need to simultaneously serve the UE, and an additional TRP dimension must be introduced. Therefore, currently, the coefficient priority definitions in the Rel-16 eType-II codebook and the Rel-17 FeType-II codebook only consider the coefficient priority definition during CSI reporting in the single TRP scenario, and are not applicable to multi-TRP joint transmission.

[0133] Therefore, this application provides a coefficient priority sorting method for a multi-station CJT codebook for multi-TRP joint transmission. Specifically, for a CJT codebook, when CSI is reported for a multi-TRP joint transmission scenario, the TRP dimension, i.e., the reference signal resource (e.g., CSI-RS resource) dimension, needs to be additionally considered to define the coefficient priority, thereby allowing a UE to report joint downlink CSI for all TRPs and enabling multi-TRP coherent joint transmission. Priority sorting of multiple TRPs (or CSI-RS resources) is considered to distinguish the reporting priorities of coefficients corresponding to different TRPs. Optionally, priority functions for coefficients corresponding to different transmission layers, different TRPs, different spatial domain basis vectors / reference signal ports, and different frequency domain basis vectors can be defined to achieve effective CSI reporting in UCI reporting of a multi-station CJT codebook.

[0134] The following describes in detail the technical solutions provided in the present application with reference to further accompanying drawings.

[0135] In this application, unless otherwise specified, the same or similar parts of embodiments or implementations shall be referred to each other. In the embodiments and implementations / implementation methods of the present application, unless otherwise specified or unless a logical contradiction occurs, the terms and / or descriptions shall be consistent and may be mutually referenced between different embodiments and implementations / implementation methods of the embodiments. The technical features of different embodiments and implementations / implementation methods of the embodiments may be combined to form new embodiments, implementations, or implementation methods based on their internal logical relationships. The following implementations of this application are not intended to limit the protection scope of this application.

[0136] 4 is a schematic flowchart of a channel state information reporting method according to an embodiment of the present application. As shown in FIG. 4, the channel state information reporting method includes, but is not limited to, the following steps:

[0137] S400: A base station transmits a reference signal in a reference signal resource, where the reference signal resource is any one of N reference signal resources.

[0138] One base station may correspond to one reference signal resource. Each of multiple base stations may generate a reference signal and transmit the reference signal to the UE on the reference signal resource corresponding to the base station. For example, if N base stations configure N reference signal resources for a UE, any one of the N base stations may transmit a reference signal to the UE on the reference signal resource configured by that base station for the UE.

[0139] Accordingly, the UE individually receives the reference signal transmitted by each base station on the reference signal resource corresponding to that base station among the N reference signal resources.

[0140] S401: A UE determines indication information of M coefficients based on reference signals on N reference signal resources.

[0141] Optionally, before S400, the base station may configure multiple reference signal resources and CSI reporting resources for the UE. The multiple reference signal resources may be periodic, semi-persistent, or aperiodic. The CSI reporting resource is a resource used by the UE during CSI reporting. The CSI reporting resource may be a resource on the PUSCH or a resource where UCI is located. The multiple reference signal resources may be configured individually by multiple base stations or may be configured by a single base station (in which case, the base station may share configuration information with another base station). For example, one base station corresponds to one reference signal resource, and each base station participating in coherent joint transmission may transmit a reference signal to the UE on the reference signal resource corresponding to that base station. Optionally, the UE may select N reference signal resources from the multiple reference signal resources configured by the base station and determine the indication information of the M coefficients based on the reference signals on the N reference signal resources. It may be understood that when the number of reference signal resources selected by the UE is less than the total number of reference signal resources configured by the base station, the UE may indicate the selected specific reference signal resources when reporting CSI, or may report the selected specific reference signal resources to the base station by using other indication information. For example, four base stations each configure one reference signal resource for the UE, so that there are four reference signal resources in total. The UE may select reference signal resources configured by the first and third base stations among the four base stations. For example, the UE may receive reference signals at two reference signal resources and then perform channel measurements on the received reference signals to obtain corresponding channel state information (CSI). It may be understood that the UE may obtain one CSI by measuring the reference signals received from N reference signal resources. Then, the UE may perform processing such as compression and quantization on the precoding matrix obtained based on the channel measurement results to obtain indication information for M coefficients. The indication information for the coefficients may include one or more of coefficient amplitude indication information, coefficient phase indication information, and coefficient position indication information. For example, n=1,...,N.The M coefficients correspond to the v transmission layers and N reference signal resources.

number

number

number

number

number

number

[0142] Optionally, the priorities of the M coefficients may be determined based on the priorities of the N reference signal resources. For details, see the description below. M and N are both integers greater than 1. The M coefficients are used to determine a joint precoding matrix corresponding to the N reference signal resources. Note that the precoding matrix needs to be further determined based on precoding information corresponding to the spatial domain basis vectors / selected reference signal ports of the reference signal resources corresponding to the M coefficients and the frequency domain basis vectors of the transmission layers and reference signal resources corresponding to the M coefficients. Each reference signal resource may correspond to one TRP. In this case, the N reference signal resources may correspond to N TRPs. In other words, the N TRPs can simultaneously serve one UE, and N may be any integer greater than 1. For example, N may be 3, or N may be set to another value. This is not particularly limited herein. The reference signal resources may be CSI-RS resources, i.e., each TRP may correspond to one CSI-RS resource.

[0143] In a possible implementation, the priorities of the M coefficients may be further determined based on one or more of the following: a transmission layer sequence number, a spatial domain basis vector sequence number, a reference signal port sequence number, and a frequency domain basis vector sequence number. For details, see the description below. In other words, the priorities of the M coefficients may be determined based on the priorities of the N reference signal resources with reference to one or more of the transmission layer sequence number, the spatial domain basis vector sequence number, the reference signal port sequence number, and the frequency domain basis vector sequence number.

[0144] S402: The UE transmits first information, where the first information includes indication information of K coefficients, where the K coefficients are determined from the M coefficients based on the M priorities.

[0145] In response, the base station receives the first information.

[0146] It may be understood that before reporting CSI, the UE may first compare the size of the resource occupied by the CSI to be reported with the size of the CSI reporting resource allocated by the base station. If the overhead of the CSI to be reported exceeds the size of the CSI reporting resource allocated by the base station, the UE may discard the indication information of some coefficients to ensure that other more important information (e.g., indication information of coefficients with higher priority) can be effectively transmitted. The other more important information may further include spatial domain basis vector indication information, frequency domain basis vector indication information, strongest coefficient indication information, etc. In this case, the K coefficients are K coefficients with higher priority among the M coefficients, where K is smaller than M. If the overhead of the CSI to be reported is less than the size of the CSI reporting resource allocated by the base station, the UE may report all the indication information of the M coefficients without discarding the indication information of the coefficients. In this case, K is equal to M.

[0147] In a possible implementation, M coefficients may be grouped into J groups based on the priorities of the M coefficients, where J is 2 or greater. The amplitude, phase, and coefficient position indication information of the same coefficient are placed in the same group. The priority of the coefficient in the first group is higher than the priority of the coefficient in the second group, which is higher than the priority of the coefficient in the third group, and the rest can be inferred by analogy. Furthermore, the higher the priority of the coefficient in each group, the further forward the amplitude, phase, and coefficient position indication information of the coefficient is placed in the CSI reporting resource. When CSI reporting resources are limited, the UE may preferentially ignore lower priority groups and preferentially report indication information of coefficients corresponding to higher priority groups. In this case, K is smaller than M, and the indication information of the K coefficients included in the first information is indication information of coefficients in one or more higher priority groups.

[0148] Note that n=1, . . . , N is used as an example, and the position indication information of the M coefficients is that the M coefficients correspond to the priorities of the v transmission layers and the N reference signal resources.

number

number

[0149] The grouping method of coefficient position information is explained below by using J=2 as an example. In a possible implementation, the first group includes the amplitude, phase, and position indication information of K1 coefficients with the highest priority among M coefficients, and the second group includes the amplitude, phase, and position indication information of K2 (K2=M-K1) coefficients with lower priority among M non-zero indication coefficients. For example, n=1,...,N. The position indication information of the K1 coefficients in the first group has the highest priority to ensure that the positions of the K1 coefficients can be completely indicated.

number

[0150] Optionally, the first information may be carried in UCI, MAC-CE, RRC signaling, PUSCH, or the like.

[0151] It can be understood that in a CJT scenario, multiple TRPs (base stations) may simultaneously serve one UE, and all of the multiple TRPs need to obtain the aggregated downlink CSI of the multiple TRPs. Optionally, when reporting CSI to a base station, the UE may transmit first information to each base station individually, in other words, the UE may report CSI to each base station individually, so that all of the multiple base stations participating in the CJT can obtain the aggregated downlink CSI. Alternatively, the UE may transmit first information to a base station among the multiple base stations, in other words, the UE may report CSI to that base station among the multiple base stations, so that the base station can obtain the downlink CSI, and the base station can share the downlink CSI with another base station participating in the CJT through communication. In this way, each of the multiple base stations participating in the CJT can obtain the downlink CSI.

[0152] In a possible implementation, after the above steps S400 to S402, the channel state information reporting method may further include the following steps:

[0153] S403: The base station determines a precoding matrix based on the indication information of the K coefficients included in the first information.

[0154] Optionally, the base station may determine a precoding matrix based on the CSI reported by the UE. Note that when K is smaller than M, the precoding matrix determined by the base station based on the indication information of K coefficients may be different from the precoding matrix indicated by the indication information of M coefficients. In other words, when the UE discards the indication information of some coefficients when reporting CSI, the precoding matrix determined by the base station based on the effectively transmitted indication information of the remaining coefficients may be different from the precoding matrix requested by the UE. When K is equal to M, the precoding matrix determined by the base station based on the indication information of K coefficients may be the same as or similar to the precoding matrix indicated by the indication information of M coefficients.

[0155] In conclusion, compared with the current Rel-16 eType-II codebook and Rel-17 FeType-II codebook, which only consider coefficient priority definition solutions for a single TRP (corresponding to a single reference signal resource) during CSI reporting, the present embodiment additionally introduces a TRP dimension (i.e., reference signal resource dimension) when CSI reporting is performed in a multi-TRP CJT scenario, thereby enabling a UE to report joint downlink CSI for all TRPs and enabling multi-TRP coherent joint transmission. Optionally, priority functions for coefficients corresponding to different transmission layers, different TRPs (or reference signal resources), different spatial-domain basis vectors / reference signal ports, and different frequency-domain basis vectors may be defined to reflect the differences in the priorities of coefficients corresponding to different TRPs. This effectively solves the problem of determining the reporting order of related information for different coefficients corresponding to different TRPs, ensures that important information is transmitted preferentially as much as possible, and reduces performance loss in the communication system.

[0156] The method for determining the priorities of the M coefficients in the embodiment of the present application is explained below by using an example.

[0157] When a definition for determining the priorities of the M coefficients is designed, the definition may be designed with reference to one or more of the following principles.

[0158] 1. Combining the reference signal resource (corresponding to the TRP, e.g., CSI-RS resource) dimension with the spatial domain basis vector (or reference signal port) dimension. For example, more spatial domain basis vectors may be typically used for the TRP of a stronger channel, or more reference signal ports may be typically selected for the TRP of a stronger channel.

[0159] 2. Avoid discarding all coefficients of one transmission layer. For example, the traversal may be performed first in the transmission layer dimension, then in the spatial domain basis vector / reference signal port dimension and reference signal resource dimension, and finally in the frequency domain basis vector dimension.

[0160] 3. Prioritize reporting of coefficients with larger amplitude values. For example, the positions of frequency-domain basis vectors may be given, and coefficients corresponding to spatial-domain basis vectors of stronger TRPs (corresponding to reference signal resources, e.g., CSI-RS resources) are reported preferentially. Alternatively, the characteristics of the Rel-16 Type-II codebook may be referenced, and a cyclic shift is performed on the frequency-domain basis vectors of all TRPs (or CSI-RS resources) based on the index of the frequency-domain basis vector corresponding to the strongest coefficient of the strongest TRP (or CSI-RS resource). The coefficient corresponding to the strongest frequency-domain basis vector is reported preferentially, and then coefficients corresponding to frequency-domain basis vectors on both sides of the strongest frequency-domain basis vector are reported. Optionally, a cyclic shift is performed on the frequency-domain basis vector of each TRP (or CSI-RS resource) based on the index of the frequency-domain basis vector corresponding to the strongest coefficient of the TRP (or CSI-RS resource).

[0161] In a possible implementation, the priorities of the M coefficients may be determined based on the priorities of the N reference signal resources. For example, if the priority of the n1th reference signal resource among the N reference signal resources is higher than the priority of the n2th reference signal resource among the N reference signal resources, the priority of any coefficient associated with the n1th reference signal resource is higher than the priority of any coefficient associated with the n2th reference signal resource. For example, M is 9 and N is 3. Three reference signal resources correspond to three TRPs (e.g., TRP1, TRP2, and TRP3), respectively, and the coefficients associated with TRP1 are 1, 2, and 3, the coefficients associated with TRP2 are 4, 5, and 6, and the coefficients associated with TRP3 are 7, 8, and 9. If the priority of TRP1 is higher than the priority of TRP2, the priorities of coefficients 1, 2, and 3 are all higher than the priorities of coefficients 4, 5, and 6, and the UE may preferentially report coefficients 1, 2, and 3 associated with TRP1. There may be no priority distinction between multiple coefficients associated with one TRP. For example, coefficients 1, 2, and 3 associated with TRP1 have the same priority. Even if there is no priority distinction between multiple coefficients associated with one TRP, when reporting amplitude, phase, and coefficient position indication information corresponding to multiple coefficients associated with one TRP, the UE may sort the positions of the amplitude, phase, and coefficient position indication information in the CSI report field according to a specific rule. The rule may be preset or predefined in a protocol. In other words, the rule is well known to the base station and the UE, so that the base station can also determine the coefficients according to the rule. For example, the rule may be that the reported coefficients are first sorted in ascending order of sequence numbers corresponding to transmission layers, then sorted in ascending order of sequence numbers of corresponding spatial domain basis vectors, and finally sorted in ascending order of sequence numbers of corresponding frequency domain basis vectors. This is not particularly limited here. In the above-described method of determining coefficient priorities based only on reference signal resources, the rule is simple, and the complexity for the UE may be simplified.

[0162] In a possible implementation, when the reference signal resource dimension and the spatial domain basis vector (or reference signal port) dimension are combined, the priority of the coefficients associated with the spatial domain basis vector or reference signal port corresponding to any one of the N reference signal resources may be determined according to any one or more of the following first preset rules:

[0163] Rule 1.1: If the priority of the n1th reference signal resource among the N reference signal resources is higher than the priority of the n2th reference signal resource among the N reference signal resources, the priority of coefficients associated with any spatial domain basis vector corresponding to the n1th reference signal resource is higher than the priority of coefficients associated with any spatial domain basis vector corresponding to the n2th reference signal resource, or the priority of coefficients associated with any reference signal port corresponding to the n1th reference signal resource is higher than the priority of coefficients associated with any reference signal port corresponding to the n2th reference signal resource. For example, N is 3. Three reference signal resources correspond to three TRPs (e.g., TRP1, TRP2, and TRP3), respectively. If the priority of TRP1 is higher than the priority of TRP2, the priority of coefficients associated with any spatial domain basis vector (or reference signal port) corresponding to TRP1 is higher than the priority of coefficients associated with any spatial domain basis vector (or reference signal port) corresponding to TRP2. As another example, the three reference signal resources may include reference signal resource 1, reference signal resource 2, and reference signal resource 3. When the priority of reference signal resource 1 is higher than the priority of reference signal resource 2, the priorities of the coefficients (coefficients of coefficient matrix 2 in FIG. 3b) associated with multiple spatial domain basis vectors (e.g., the column vectors (2L1 in total) of spatial domain matrix 2 in FIG. 3b) corresponding to reference signal resource 1 (corresponding to TRP1) in CSI are all higher than the priorities of the coefficients associated with any spatial domain basis vector corresponding to reference signal resource 2. It is understood that reference signal resource 2 may also correspond to a precoding matrix similar to that in FIG. 3b. The precoding matrix may be decomposed into three matrices to be multiplied (a spatial domain matrix, a coefficient matrix, and a frequency domain matrix), and details will not be described here.

[0164] Rule 1.2: If the priority of the n1-th reference signal resource among the N reference signal resources is higher than the priority of the n2-th reference signal resource among the N reference signal resources, the priority of a coefficient associated with the i-th spatial domain basis vector corresponding to the n1-th reference signal resource is higher than the priority of a coefficient associated with the i-th spatial domain basis vector corresponding to the n2-th reference signal resource having the same sequence number, or the priority of a coefficient associated with the i-th reference signal port corresponding to the n1-th reference signal resource is higher than the priority of a coefficient associated with the i-th reference signal port corresponding to the n2-th reference signal resource having the same sequence number, where i represents the sequence number of the spatial domain basis vector or reference signal port. For example, if the priority of TRP1 is higher than the priority of TRP2, the priority of a coefficient associated with the spatial domain basis vector (or reference signal port) having sequence number i (e.g., i may be set to 1) and corresponding to TRP1 is higher than the priority of a coefficient associated with the spatial domain basis vector (or reference signal port) having sequence number i (e.g., i is set to 1) and corresponding to TRP2.

[0165] Optionally, the comparison of coefficient priorities in any item of the above-mentioned first preset rule satisfies the following premise: during the comparison, the sequence numbers of the frequency domain basis vectors associated with the two reference signal resources are the same, or the cyclically shifted indexes of the frequency domain basis vectors associated with the two reference signal resources are the same.

[0166] Optionally, when coefficient reporting priorities for multi-station codebooks are defined, the frequency domain dimension can be used as the prioritized dimension as the last dimension to traverse during priority calculation. The following uses a multi-station codebook based on Rel-16 eType-II and a multi-station codebook based on Rel-17 FeType-II as examples for simple illustration.

[0167] For a multi-station codebook based on Rel-16 eType-II, a sequence number combination (l,i,f,n) may be given. The priority of the coefficients corresponding to the combination is determined based on a priority function Pri(l,i,f,n), and the priorities of the amplitude, phase, and position indication information of the coefficients are also determined accordingly. The smaller the value of Pri(l,i,f,n), the higher the priority of the amplitude, phase, and position indication information of the coefficients corresponding to the combination, and the higher the priority is reported. For simplicity of description, the coefficients corresponding to the lth transmission layer, nth reference signal resource, ith spatial domain basis vector, and fth frequency domain basis vector used to determine the precoding matrix are denoted by C l,i,f,n It is expressed as:

[0168] For example, any coefficient C among the M coefficients l,i,f,n The priority function is Pri(l,i,f,n)=2L max ·X·v·π(f)+v·φ(i,n)+l is satisfied, where l represents the transmission layer sequence number, l is set to 1, 2, ···v, v represents the number of transmission layers, and i represents the spatial domain basis vector sequence number (e.g., the spatial domain basis vector in the ith column in the spatial domain matrix 2 in Figure 3b), i.e., the coefficient C l,i,f,n The spatial domain basis vectors corresponding to the nth reference signal resource are n is the i-th spatial domain basis vector of the selected spatial domain basis vectors, where i is 0, 1, . . . , 2L n Set to -1, L n represents the spatial domain basis vectors in each polarization direction corresponding to the nth reference signal resource (two polarization directions share the same spatial domain basis vector), and f represents the frequency domain basis vector sequence number (e.g., the frequency domain basis vector in the fth row or the conjugate transpose of the frequency domain basis vector in the fth row in the frequency domain matrix 2 in Figure 3b), i.e., the coefficient C l,i,f,n The frequency domain basis vectors corresponding to the l-th transmission layer and the n-th reference signal resource are vis the fth frequency-domain basis vector among the selected frequency-domain basis vectors, where f is 0, 1, . . . , M v Set to -1, M v represents the number of frequency-domain basis vectors, n represents the sequence number of N reference signal resources, where n=1, 2, . . . , N, n=0, 1, . . . , N-1, or n may be set to another value, and φ(i,n) represents the priority of the coefficient set associated with the ith spatial-domain basis vector corresponding to the nth reference signal resource, where φ(i,n)<2L. max ·X is satisfied, where X is an integer equal to or greater than N, and L max is greater than or equal to the maximum number of spatial domain basis vectors corresponding to the N reference signal resources, respectively; π(f) represents a first remapping function used to remap the sequence numbers or indices of the frequency domain basis vectors selected for the lth transmission layer and the nth reference signal resource; and Pri(l,i,f,n) represents the priority of a coefficient corresponding to a given combination of the lth transmission layer, the nth reference signal resource, the ith spatial domain basis vector, and the fth frequency domain basis vector, i.e., the coefficient corresponding to the ith spatial domain basis vector and the fth frequency domain basis vector of the nth reference signal resource corresponding to the lth transmission layer.

[0169] In addition,

number

[0170] Optionally, the sequence number of the spatial domain basis vectors is an internal ranking of the 2L spatial domain basis vectors corresponding to the two polarization directions. Usually, the sequence number is the Lth order in the entire set of spatial domain basis vectors. n The sequence number of the selected reference signal port is determined based on the index values ​​and polarization direction numbers of the selected spatial domain basis vectors.1,n The sequence number of the frequency domain basis vectors is M v an internal ranking of the selected frequency-domain basis vectors, which is typically determined based on the index size of the selected frequency-domain basis vectors within the entire set of frequency-domain basis vectors.

[0171] Optionally, when the N reference signal resources are reference signal resources selected by the UE from a plurality of reference signal resources (e.g., N0) configured by the base station, n may be a sequence number of the N reference signal resources among the N0 reference signal resources configured by the base station, and the nth reference signal resource represents the nth reference signal resource among the N0 reference signal resources. In this case, the value range of n may be 1, 2,...,N0 or 0, 1,...,N0-1. For example, when N0 is 4, the sequence numbers of the plurality of reference signal resources configured by the base station may be 1, 2, 3, and 4. When N is 3, the UE selects three reference signal resources with sequence numbers 1, 3, and 4, respectively, from the four reference signal resources, and n may be set to 1, 3, and 4, i.e., the reference signal resource with sequence number 3 is the second reference signal resource among the three reference signal resources selected by the UE. Alternatively, n may be an internal sequence number of the N reference signal resources and represent the ranking of the reference signal resources among the N reference signal resources. In this case, n = 1, 2, . . . , N. For example, in the above example, the UE selects three reference signals whose sequence numbers are 1, 3, and 4, respectively (i.e., sequence numbers among the N reference signal resources hereinafter referred to as original sequence numbers), and the internal sequence numbers of the three reference signals are 1, 2, and 3 (i.e., sequence numbers among the N reference signal resources hereinafter referred to as new sequence numbers), where the new sequence number of the reference signal resource whose original sequence number is 1 is 1, the new sequence number of the reference signal resource whose original sequence number is 3 is 2, and the new sequence number of the reference signal resource whose original sequence number is 4 is 3. Alternatively, n may be a sequence number obtained by sorting the N reference signal resources (e.g., CSI-RS resources) selected by the UE according to a rule (e.g., the second preset rule below). In this case, n = 1, 2, . . . , N.It may be understood that the value of the sequence number n can start from 1 or may start from 0, i.e., n=0, 1, . . ., N-1. Of course, n may alternatively be set to any value, provided that N reference signal resources can be distinguished. This is not particularly limited here. For ease of understanding, n=1, 2, . . ., N or n=0, 1, . . . N-1 are used as illustrative examples in the embodiments of the present application, but should not constitute any limitation on the embodiments of the present application.

[0172] In a possible implementation, for a multi-station codebook based on Rel-16 eType-II, when calculating the priority of a coefficient corresponding to a given combination (l, i, f, n), the UE may first remap the sequence number or index of the frequency-domain basis vector selected for the lth transmission layer and the nth reference signal resource by using a first remapping function π(f). Figure 5 is a diagram of frequency-domain basis vector cyclic shift according to an embodiment of the present application. The UE may perform a global cyclic shift on the frequency-domain basis vectors selected for each reference signal resource corresponding to each transmission layer (cyclic shift scheme 1) so that the frequency-domain basis vector corresponding to the strongest coefficient of each transmission layer is always located at the position of the first frequency-domain basis vector (corresponding index may be 0), or may perform a cyclic shift on the frequency-domain basis vectors selected for each reference signal resource corresponding to each transmission layer (cyclic shift scheme 2) so that the frequency-domain basis vector corresponding to the strongest coefficient of each reference signal resource corresponding to each transmission layer is always located at the position of the first frequency-domain basis vector of the reference signal resource (corresponding index may be 0). Usually, the coefficients corresponding to the frequency-domain basis vectors adjacent to the frequency-domain basis vector corresponding to the strongest coefficient have large amplitudes and strong energies. Therefore, the UE may preferentially report the coefficient corresponding to the frequency-domain basis vector corresponding to the strongest coefficient (index is 0), and then report the coefficients corresponding to the frequency-domain basis vectors on both sides of the frequency-domain basis vector corresponding to the strongest coefficient.

[0173] For example, the value range of the first remapping function π(f) is from 0 to N3-1, where N3 is the number of frequency domain units of the PMI. The value range of the sequence number of the frequency domain basis vector is from 0 to M v-1, and the value range of the index of the frequency domain basis vector is from 0 to N3-1, since the frequency domain basis vector is usually selected from N3 frequency domain units. Optionally, the first remapping function π(f) may be defined with reference to the following method:

[0174] (1)

number

number

number

[0175] (2)

number

number

number

[0176] (3)π(f)=f holds.

[0177] In the case of the above method (1), π(f) is π lIt can also be expressed as (f). When the transmission layer sequence number l is set to a different value, the value of π(f) may be different, and the value of π(f) is the same for different reference signal resources. In the case of the above method (2), π(f) is expressed as π l,n (f). The value of π(f) can be different when the combination of transmission layer sequence number l and reference signal resource sequence number n is set to different values.

[0178] When the reference signal resource (e.g., CSI-RS resource) dimension and the spatial domain basis vector (or reference signal port) dimension are combined, optionally, a reference signal resource ranking mapping relationship G(n) is first introduced, where G(n) denotes the sequence number obtained by sorting N reference signal resources according to a rule (e.g., the following second preset rule). The higher the priority of a reference signal resource, the smaller the corresponding value of G(n). Optionally, the value range of G(n) may be 0 to N-1, or 1 to N, or may be the same as the value range of n.

[0179] For example, the priorities of the N reference signal resources may be determined according to any one or more items of the following second preset rules:

[0180] Rule 2.1: The more spatial domain basis vectors or reference signal ports corresponding to a reference signal resource, the higher the priority of the reference signal resource. For example, the priority of each reference signal resource is determined by the number L of spatial domain basis vectors corresponding to the reference signal resource. n It can be determined based on L n The larger the value of L, the smaller the sequence number G(n) of the corresponding sorted reference signal resource, that is, the higher the priority of the reference signal resource. nIf the values ​​of L1, L2, and L3 are the same, sorting can be performed based on the original sequence numbers of the reference signal resources. For example, if the values ​​of the spatial domain basis vectors L1, L2, and L3 of three reference signal resources (corresponding to TRP1, TRP2, and TRP3) are 1, 3, and 2, respectively, the three reference signal resources can be sorted as 2, 0, and 1 correspondingly, that is, TRP2 has the highest priority and TRP1 has the lowest priority.

[0181] In addition, since the number of spatial domain basis vectors / number of reference signal ports used to determine the priority of reference signal resources in Rule 1 is set by the network device or reported by the terminal device, the UE does not need to additionally report the priority of multiple reference signal resources.

[0182] Rule 2.2: For each transmission layer, the larger the amplitude of the strongest coefficient corresponding to the reference signal resource corresponding to that transmission layer, the higher the priority of the reference signal resource corresponding to that transmission layer. In other words, the priority of each reference signal resource corresponding to each transmission layer may be determined based on the amplitude of the strongest coefficient of the reference signal resource corresponding to that transmission layer. The larger the amplitude of the strongest coefficient, the higher the ranking of the reference signal resource corresponding to that transmission layer. In this case, the priority of the reference signal resource is further related to the sequence number of the transmission layer. In this case, G(n) may be denoted as G1(n), which may indicate that the value of G(n) is different for different transmission layers, i.e., the priorities of the reference signal resources corresponding to different transmission layers are different. Note that, in this method, the position where the amplitude indication information of the strongest coefficient of each reference signal resource corresponding to each transmission layer is placed in the UCI may be moved further forward, to a position before the position indication information and amplitude / phase indication information of other coefficients. Alternatively, only the amplitude of the strongest coefficient of each reference signal resource corresponding to the first transmission layer may be used as the basis for determining the priority of the reference signal resource. In this case, the reference signal resources corresponding to all transmission layers have the same priority, and only the amplitude position of the amplitude indication information of the strongest coefficient of each reference signal resource corresponding to the first transmission layer in the UCI needs to be moved further forward, to a position before the position indication information and amplitude / phase indication information of another coefficient.

[0183] Rule 2.3: The UE determines the priority of the reference signal resource in a specific manner and adds a reporting quantity indicating the priority of the reference signal resource to the CSI to ensure policy consistency between the UE and the base station. For example, the priority can be determined based on the signal strength of the reference signal corresponding to the reference signal resource. For example, the higher the signal strength of the reference signal corresponding to the reference signal resource, the higher the priority of the reference signal resource. In other words, the service for the UE can determine the priority of the reference signal resource based on the signal strength of the reference signal, and the reference signal resource with a stronger signal is ranked higher, i.e., the reference signal resource has a higher priority.

[0184] Rule 2.4: The priority of a reference signal resource is directly determined based on the sequence number of the reference signal resource. The smaller the sequence number of the reference sequence number resource, the higher the priority, and the smaller the corresponding value of G(n). In a possible implementation, G(n)=n.

[0185] In addition, when n in the priority Pri(l,i,f,n) is defined as the sequence number obtained by sorting the N reference signal resources selected by the UE according to the rules, G(n)=n.

[0186] Optionally, after the priority of the reference signal resource (for example, CSI-RS resource) is determined, for the priority design principle in which the reference signal resource dimension and the spatial domain basis vector dimension are combined and the corresponding definition of φ(i,n), refer to one or more of the following methods.

[0187] Method 1: The sequence number of the priority of the reference signal resource is given, and the priority of the coefficient set corresponding to the spatial domain basis vector can be defined in ascending order of the sequence number of the spatial domain basis vector. For example, φ(i,n)=2L max ·G(n)+i. Specifically, when the priority of the n1-th reference signal resource is higher than the priority of the n2-th reference signal resource, that is, G(n1)<G(n2), the priority of the coefficient related to any spatial domain basis vector corresponding to the n1-th reference signal resource is higher than the priority of the coefficient related to any spatial domain basis vector corresponding to the n2-th reference signal resource. Further, for each reference signal resource, the smaller the sequence number of the spatial domain basis vector, the higher the priority of the coefficient related to that spatial domain basis vector. In other words, for the n-th reference signal resource, when the sequence numbers of two spatial domain basis vectors satisfy i1<i2, φ(i1,n)<φ(i2,n).

[0188] See the example of Method 1 in Figure 6. Figure 6 is a diagram of priority definition in which spatial domain and reference signal resources are combined according to an embodiment of the present application. For example, N is 3, and n = 1, 2, 3. Three reference signal resources may correspond to three TRPs (e.g., TRP1, TRP2, and TRP3), and the priority of a TRP is determined based on the number of corresponding spatial domain basis vectors or reference signal ports. Thus, TRP2 has the highest priority (G(2) = 0), TRP3 has the second highest priority (G(3) = 1), and TRP1 has the lowest priority (G(1) = 2). As shown in the example of Method 1 in Figure 6, the priority of the coefficient set associated with the spatial domain basis vector or reference signal port corresponding to TRP2 is higher than the priority of the coefficient set associated with the spatial domain basis vector or reference signal port corresponding to TRP3. Furthermore, for TRP1, the smaller the sequence number of the spatial domain basis vector, the higher the priority of the coefficient associated with the spatial domain basis vector. 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 12 and 13 have different values ​​of (i,n), and φ(i,n)=2L max When G(n)+i, it represents the result of the priority φ(i,n) of the coefficient set associated with (i,n). For example, when i is 0 and n is 2, φ(0,2)=2L max G(2)+0, where G(2)=0, so φ(0,2)=0. As another example, when i is 0 and n is 1, φ(0,1)=2L max ·G(1)+0, where G(1)=2, so φ(0,1)=12.

[0189] Method 2: The sequence number of the spatial domain basis vector is given, and the priority of the coefficient set corresponding to the spatial domain basis vector is defined in ascending order of the sequence number of the reference signal resource. For example, φ(i,n)=N·i+G(n). Specifically, when the priority of the n1-th reference signal resource is higher than that of the n2-th reference signal resource, that is, G(n1)<G(n2), for each spatial domain basis vector, φ(i,n1)<φ(i,n2). Further, for each reference signal resource, the smaller the sequence number of the spatial domain basis vector, the higher the priority of the coefficient related to the spatial domain basis vector. In other words, for the n-th reference signal resource, when the sequence numbers of two spatial domain basis vectors satisfy i1<i2, then φ(i1,n)<φ(i2,n). As shown in the example of Method 2 in FIG. 6, for example, n = 1, 2, 3. The priority of TRP2 is the highest (G(2)=0), the priority of TRP3 is the second highest (G(3)=1), and the priority of TRP1 is the lowest (G(1)=2). In this case, for a given number of the spatial domain basis vector, the coefficient corresponding to TRP2 can be preferentially reported, then the coefficient corresponding to TRP3 is reported, and finally the coefficient corresponding to TRP1 is reported. 0, 1, 2, 3, 4, 5, 6, 7, 9, 10, 12, and 15 represent the results of the priority φ(i,n) of the coefficient set associated with (i,n) when the values of (i,n) are different and φ(i,n)=N·i+G(n). For example, when i is 0 and n is 2, φ(0,2)=N·0+G(2), and since G(2)=0, φ(0,2)=0. As another example, when i is 0 and n is 1, φ(0,1)=N·0+G(1), and since G(1)=2, φ(0,1)=2.

[0190] Method 3: The sequence number of the spatial domain basis vector is remapped, the remapped sequence number of the spatial domain basis vector is given, and the priority of the coefficient set corresponding to the spatial domain basis vector is defined in ascending order of the sequence number of the reference signal resource. For example, the sequence number of each spatial domain basis vector can be remapped first. For example, φ(i,n)=N·φn (i) + G(n), where φ n (i) represents a remapping function and is used to remap the sequence numbers of the spatial domain basis vectors. Optionally, when the priority of the n1-th reference signal resource is higher than the priority of the n2-th reference signal resource, that is, G(n1) < G(n2), for spatial domain basis vectors having the same remapping value, that is, φ n1 (i1) = φ n2 (i2), then φ(i1,n1) < φ(i1,n2). Further, for each reference signal resource, the smaller the result of the remapping function φ n (i) for the spatial domain basis vector, the higher the priority of the coefficient associated with that spatial domain basis vector. In other words, for the n-th reference signal resource, when φ n (i1) < φ n (i2), then φ(i1,n) < φ(i2,n). φ n (i) satisfies φ n (i) < 2L max , for example, φ n (i) = i + 2L max - 2L n , that is, φ(i,n) = N·(i + 2L max - 2L n ) + G(n). In this case, it can be guaranteed that the priority of the set of coefficients corresponding to some spatial domain basis vectors having smaller sequence numbers of the reference signal resource having a larger value of L n is higher than the priority of the coefficients corresponding to the spatial domain basis vectors of another reference signal resource.

[0191] See the example of Method 3 in Figure 6. For example, n = 1, 2, 3. The number of spatial domain basis vectors corresponding to TRP2 is the largest (e.g., 6), the number of spatial domain basis vectors corresponding to TRP3 is the second largest (e.g., 4), and the number of spatial domain basis vectors corresponding to TRP1 is the smallest (e.g., 2). Therefore, coefficient sets corresponding to some spatial domain basis vectors corresponding to TRP2 (e.g., coefficient sets corresponding to spatial domain basis vectors whose φ(i,n) values ​​are set to 0 and 3) may be reported preferentially, i.e., the coefficient set corresponding to the 0th spatial domain basis vector of the second reference signal resource has the highest priority (corresponding to φ(0,2) = 0), and the coefficient set corresponding to the 1st spatial domain basis vector of the second reference signal resource has the second highest priority (corresponding to φ(1,2) = 3). In this case, for the remaining four spatial domain basis vectors of TRP2 and the remaining four spatial domain basis vectors of TRP3, the priority of the coefficient sets of spatial domain basis vectors with the same remapped sequence number may be determined based on the order of the reference signal resource (i.e., TRP). For example, the coefficient set corresponding to the spatial domain basis vector with φ(2,2)=6 corresponding to TRP2 is reported first, followed by the coefficient set corresponding to the spatial domain basis vector with φ(0,3)=7 corresponding to TRP3. 0, 3, 6, 7, 9, 10, 12, 13, 14, 15, 16, and 17 have different values ​​of (i,n), and φ(i,n)=N·(i+2L max -2L n )+G(n), then φ(0,2)=N·0+G(2), where G(2)=0, so φ(0,2)=0. As another example, when i is 1 and n is 2, φ(0,1)=N·(i+2L max -2L n ) + G(2), where G(2) = 0, so φ(1,2) = 3. n If (i)=i, then φ(i,n)=N·φ n(i) + G(n) satisfies Method 2, i.e., φ(i,n) = N·i + G(n).

[0192] Method 4: The priority of the coefficient set corresponding to the spatial domain basis vector of the reference signal resource is determined by the number L of spatial domain basis vectors of the reference signal resource. n For example, the spatial domain basis vectors corresponding to each reference signal resource may be grouped into Z groups in ascending order of sequence numbers. In other words, the smaller the group number, the smaller the spatial domain basis vector sequence number within the group. The number of spatial domain basis vectors included in one or more spatial domain basis vector groups corresponding to each reference signal resource is Q n and Z·Q n =2L n is satisfied. Optionally, for a given group number, the coefficients associated with spatial domain basis vectors corresponding to reference signal resources with higher priority have higher priority. For each reference signal resource, the coefficient sets associated with spatial domain basis vectors with lower group numbers have higher priority. For the same spatial domain basis vector group, the smaller the sequence number of the spatial domain basis vector, the higher the priority of the coefficient set associated with the spatial domain basis vector. For example,

number

[0193] See an example of Method 4 in Figure 6. For example, n = 1, 2, 3. The spatial domain basis vectors corresponding to each TRP (or CSI-RS resource) may be grouped into two groups in ascending order of sequence number. For example, the spatial domain basis vectors corresponding to TRP1 when the value of φ(i,n) is set to 6 are one group; the spatial domain basis vectors corresponding to TRP1 when the value of φ(i,n) is set to 15 are one group; the spatial domain basis vectors corresponding to TRP2 when the value of φ(i,n) is set to 0, 1, and 2 are one group; the spatial domain basis vectors corresponding to TRP2 when the value of φ(i,n) is set to 9, 10, and 11 are one group; the spatial domain basis vectors corresponding to TRP3 when the value of φ(i,n) is set to 3 and 4 are one group; and the spatial domain basis vectors corresponding to TRP3 when the value of φ(i,n) is set to 12 and 13 are one group. The values ​​of φ(i,n) may be set to 0, 1, and 2, and the coefficient sets corresponding to the group of spatial domain basis vectors corresponding to TRP2 may be reported preferentially, then the values ​​of φ(i,n) may be set to 3 and 4, and the coefficient sets corresponding to the group of spatial domain basis vectors corresponding to TRP3 may be reported, and the rest can be inferred by analogy.

[0194] For Method 3 and Method 4, it can be understood that the value of φ(i,n) is related to the number of spatial domain basis vectors corresponding to each reference signal resource. Optionally, the comparison of coefficient priorities in any one of the above four methods satisfies the following assumption: during the comparison, the sequence numbers of the frequency domain vectors associated with two reference signal resources are the same, or the cyclically shifted indexes of the frequency domain basis vectors associated with two reference signal resources are the same.

[0195] Arbitrarily, φ(i,n) is φ(i,n)<2L max·X is satisfied. The value of X is related to the value of the priority G(n) of the reference signal resource. X is greater than the maximum value among the values ​​of G(n) corresponding to all reference signal resources. In this way, when l, i, f, n in different given sequence number combinations (l, i, f, n) are set to different values, it can be ensured that the priority values ​​Pri(l, i, f, n) of the coefficients corresponding to all combinations are different. For example, when the value range of G(n) is from 0 to N-1, X can be set to N, or when the value range of G(n) is from 1 to N, X can be set to N+1.

[0196] In the above method, for the example where a multi-station codebook based on Rel-16 eType-II is used, the frequency domain dimension is used as the preferred dimension, so that Pri(l,i,f,n)=2L max ·X·v·π(f)+v·φ(i,n)+l. The value of Pri(l,i,f,n) is expressed by using one transmission layer (v=1) and two reference signal resources (N=2) as an example. It is assumed that the value of the reference signal resource sequence number is n=1 or 2, and each reference signal resource corresponds to two frequency domain basis vectors. The number of spatial domain basis vectors of the first reference signal resource is L1=1, and the number of spatial domain basis vectors of the second reference signal resource is L2=2. In this case, L maxThe value of is 2. For example, when the priority of reference signal resources is determined based on the number of spatial domain basis vectors, G(1)=1 and G(2)=0. In this case, the value of X is 2. The cyclically shifted index numbers of the frequency domain basis vectors corresponding to the first reference signal resource corresponding to the first transmission layer are 0 and 2, in other words, π(0)=0 and π(1)=2 for the first reference signal resource corresponding to the first transmission layer, and the cyclically shifted index numbers of the frequency domain basis vectors corresponding to the second reference signal resource corresponding to the first transmission layer are 1 and 4, in other words, π(0)=1 and π(1)=4 for the second reference signal resource corresponding to the first transmission layer. For example, φ(i,n)=2L max In the case of G(n)+i, φ(0,1)=4, φ(1,1)=5, φ(0,2)=0, φ(1,2)=1, φ(2,2)=2, and φ(3,2)=3. In this case, the values ​​corresponding to the different sequence number combinations (l,i,f,n) are Pri(l,i,f,n)=2L max The priority function is determined according to the following formula: ·X·v·π(f)+v·φ(i,n)+l, and Pri(1,0,0,1)=5, Pri(1,1,0,1)=6, Pri(1,0,0,2)=1, Pri(1,1,0,2)=2, Pri(1,2,0,2)=3, Pri(1,3,0,2)=4, Pri(1,0,1,1)=13, Pri(1,1,1,1)=14, Pri(1,0,1,2)=9, Pri(1,1,1,2)=10, Pri(1,2,1,2)=11, and Pri(1,3,1,2)=12 are obtained, and the priority of different corresponding coefficients can be determined. For the priority function value calculation process in the following embodiment, the above-mentioned function Pri(l,i,f,n)=2L max Please refer to the value calculation process for ·X·v·π(f)+v·φ(i,n)+l.

[0197] In the above, a multi-station codebook based on Rel-16 eType-II is used as an example to explain how the frequency domain dimension is used as the dimension to be prioritized when defining the coefficient reporting priority of the multi-station codebook. Similarly, for a multi-station codebook based on Rel-17 FeType-II, a sequence number combination (l,i,f,n) may be given. The priority of the coefficient corresponding to the combination is determined based on a priority function Pri(l,i,f,n), and the priority of the amplitude, phase, and position indication information of the coefficient is also determined accordingly. The smaller the value of Pri(l,i,f,n), the higher the priority of the amplitude, phase, and position indication information of the coefficient corresponding to the combination, and the higher the priority is to be reported preferentially. For simplicity, the coefficients corresponding to the lth transmission layer, nth reference signal resource, ith spatial domain basis vector, and fth frequency domain basis vector used to determine the precoding matrix are denoted by C l,i,f,n Specifically, one of the M coefficients, C l,i,f,n The priority function of is Pri(l,i,f,n)=K 1,max ·v·X·f+v·φ(i,n)+l is satisfied, where l represents the transmission layer sequence number, l is set to 1, 2, ···, v, v represents the number of transmission layers, i represents the sequence number of the reference signal port, i is set to 0, 1, ···, K 1,n -1, specifically, the coefficient C l,i,f,n The reference signal port corresponding to the nth reference signal resource is 1,n is the i-th reference signal port among the K selected reference signal ports, 1,n represents the number of selected reference signal ports corresponding to the nth reference signal resource, f represents the frequency domain basis vector sequence number, and f ranges from 0, 1, . . . , M v -1, specifically, the coefficient C l,i,f,n The frequency domain basis vectors corresponding to the l-th transmission layer and the n-th reference signal resource are v is the fth frequency domain basis vector among the selected frequency domain basis vectors, and Mv represents the number of frequency domain basis vectors, and n represents the sequence number of N reference signal resources, where, optionally, n can be set to 1, 2, . . . , N, or n can be set to 0, 1, . . . , N-1, or n can be set to another value. max X represents the priority of the coefficient set associated with the i-th reference signal port corresponding to the n-th reference signal resource, and K 1,max is greater than or equal to the maximum number of selected reference signal ports corresponding to the aforementioned N reference signal resources, respectively, and Pri(l,i,f,n) represents the priority of a coefficient corresponding to a given combination of the l-th transmission layer, the n-th reference signal resource, the i-th reference signal port, and the f-th frequency-domain basis vector.

[0198] In addition,

number

[0199] The sequence numbers of the spatial domain basis vectors / reference signal ports, the sequence numbers of the frequency domain basis vectors, and the sequence numbers of the reference signal resources (value of n) are calculated using the above function Pri(l,i,f,n)=2L max See the corresponding explanation of ·X·v·π(f)+v·φ(i,n)+l, the details of which will not be repeated here.

[0200] It can be seen that the priority definition method of the multi-station codebook based on Rel-17 FeType-II can be similar to that of the multi-station codebook based on Rel-16 eType-II. The main difference between them is that in the priority definition method of the multi-station codebook based on Rel-17 FeType-II, the spatial domain basis vector sequence number is replaced with the selected reference signal port sequence number. Furthermore, in the priority definition method of the multi-station codebook based on Rel-17 FeType-II, since the number of frequency domain basis vectors is small, frequency domain replacement is not required. It should be noted that in the priority definition method of the multi-station codebook based on Rel-17 FeType-II, the definition of φ(i,n) can be similar to that of the multi-station codebook based on Rel-16 eType-II, so that L max and L n is correspondingly K 1,max and K. 1,n should be replaced by

[0201] Optionally, when the reference signal resource (CSI-RS resource) dimension and the spatial domain basis vector (or reference signal port) dimension are combined, a mapping relationship G(n) of reference signal resource priority may be first introduced. The value of G(n) is the same as the value range of n and may represent the sequence number obtained by sorting N reference signal resources according to a rule. If a reference signal resource has a higher priority, the corresponding value of G(n) is smaller. For the rule for determining the priority of reference signal resources, please refer to the aforementioned rule for determining the priority of reference signal resources in a multi-station codebook based on Rel-16 eType-II.

[0202] Optionally, in the priority definition method for a multi-station codebook based on Rel-17 FeType-II, after the priority of reference signal resources (e.g., CSI-RS resources) is determined, for the priority design principle in which the reference signal resource dimension and the reference signal port dimension are combined, the definition of the corresponding φ(i,n) may refer to one or more of the above-mentioned priority definition methods for a multi-station codebook based on Rel-16 eType-II (e.g., Method 1, Method 2, and Method 4 shown in FIG. 6), and the spatial domain basis vector dimension is replaced by the reference signal port dimension.

[0203] For example, in the priority definition method of the multi-station codebook based on Rel-17 FeType-II, φ(i,n) may satisfy any one of the following equations: φ(i,n)=K 1,max G(n)+i, where G(n) represents the priority of the nth reference signal resource among N reference signal resources, and K 1,max is equal to or greater than the maximum number of selected reference signal ports corresponding to the N reference signal resources, respectively, and i represents the reference signal port sequence number, where i is 0, 1, . . . , K 1,n Set to -1, K 1,n represents the number of selected reference signal ports corresponding to the nth reference signal resource; φ(i,n)=N·i+G(n), where G(n) represents the priority of the nth reference signal resource among N reference signal resources, and i represents the reference signal port sequence number, where i is 0, 1, . . . , K. 1,n Set to -1, K 1,n represents the number of selected reference signal ports corresponding to the nth reference signal resource; φ(i,n)=N·φn(i)+G(n), where G(n) represents the priority of the nth reference signal resource among N reference signal resources, and i represents the reference signal port sequence number, where i is 0, 1, . . . , K. 1,n Set to -1, K 1,n represents the number of selected reference signal ports corresponding to the nth reference signal resource, and φ n(i)=i or φ n (i)=i+K 1,max -K 1,n and φ n (i) represents a third remapping function, which is used to remap the reference signal port sequence numbers; or

number

[0204] In a possible implementation, in addition to the above-mentioned method in which the frequency domain dimension is used as the preferentially considered dimension when defining the coefficient reporting priority of the multi-station codebook, the reference signal resource dimension may also be used as the preferentially considered dimension. In other words, if the priority of the n1-th reference signal resource among the N reference signal resources is higher than the priority of the n2-th reference signal resource among the N reference signal resources, the priority of any coefficient associated with the n1-th reference signal resource will be higher than the priority of any coefficient associated with the n2-th reference signal resource.

[0205] Optionally, in a possible implementation, for grouping by priority of CSI reporting, the amplitude, phase, and coefficient indication information of M coefficients may be grouped into N groups based on the priorities of the M coefficients, where N is equal to the number of reference signal resources used for CJT selected and reported by the UE. The first group includes the amplitude, phase, and position indication information of M1 coefficients corresponding to the reference signal resource with the highest priority, the second group includes the amplitude, phase, and position indication information of M2 coefficients corresponding to the reference signal resource with the second highest priority, and the rest can be inferred by analogy. Furthermore, within the same group, the amplitude, phase, and coefficient position indication information of coefficients with higher priorities are placed earlier in the CSI reporting resources. When CSI reporting resources are limited, the UE may preferentially ignore groups with lower priorities and preferentially report indication information of coefficients corresponding to groups with higher priorities. Optionally, the frequency domain basis vector indication information corresponding to all reference signal resources and the indication information of the coefficients corresponding to the reference signal resource with the highest priority may be placed together in a first group for reporting, or the frequency domain basis vector indication information corresponding to each reference signal resource may be placed in the group in which the reporting coefficient corresponding to that reference signal resource is placed for reporting.

[0206] Optionally, in another possible implementation of grouping by CSI reporting priority, the amplitude, phase, and coefficient indication information of M coefficients are grouped into two groups based on the priorities of the M coefficients. The first group includes the amplitude, phase, and position indication information of M1 coefficients corresponding to the reference signal resource with the highest priority, and the second group includes the amplitude, phase, and position indication information of the remaining M-M1 coefficients, with the remaining being inferred by analogy. Furthermore, within the same group, the amplitude, phase, and coefficient position indication information of coefficients with higher priorities are placed earlier in the CSI reporting resources. When CSI reporting resources are limited, the UE may preferentially ignore groups with lower priorities and preferentially report indication information of coefficients corresponding to groups with higher priorities. Optionally, the frequency-domain basis vector indication information corresponding to all reference signal resources and the indication information of coefficients corresponding to the reference signal resource with the highest priority may be placed together in the first group for reporting. Alternatively, the frequency-domain basis vector indication information corresponding to each reference signal resource may be placed in the group in which the reporting coefficient corresponding to that reference signal resource is placed for reporting. In other words, the frequency domain basis vector indication information corresponding to the reference signal resource with the highest priority is placed in the first group for reporting, and the frequency domain basis vector indication information corresponding to the remaining reference signal resources is placed in the second group for reporting. For the frequency domain basis vector reference information in the second group, its fields may be sorted based on the reference signal resource sequence number or based on the reference signal resource priority.

[0207] For ease of understanding, the following also uses a multi-station codebook based on Rel-16 eType-II and a multi-station codebook based on Rel-17 FeType-II as examples for simple description.

[0208] Optionally, in the case of a multi-station codebook based on Rel-16 eType-II, a sequence number combination (l,i,f,n) may be given. The priority of the coefficients corresponding to the combination is determined based on a priority function Pri(l,i,f,n), and the priorities of the amplitude, phase, and position indication information of the coefficients are also determined accordingly. The smaller the value of Pri(l,i,f,n), the higher the priority of the amplitude, phase, and position indication information of the coefficients corresponding to the combination, and the higher the priority is reported preferentially. For simplicity of description, the coefficients corresponding to the lth transmission layer, the nth reference signal resource, the ith spatial domain basis vector, and the fth frequency domain basis vector used to determine the precoding matrix are denoted by C l,i,f,n Specifically, any coefficient C among the M coefficients l,i,f,n The priority of is Pri(l,i,f,n)=2L max ·v·Y·G(n)+2L max ·v·π(f)+v·i+l, where l represents the transmission layer sequence number, l is set to 1, 2, ···v, v represents the number of transmission layers, and i represents the spatial domain basis vector sequence number (e.g., the spatial domain basis vector in the i-th column in the spatial domain matrix 2 in Figure 3b), i.e., the coefficient C l,i,f,n The spatial domain basis vectors corresponding to the nth reference signal resource are n is the i-th spatial domain basis vector of the selected spatial domain basis vectors, where i is 0, 1, . . . , 2L n Set to -1, L n represents the spatial domain basis vectors in each polarization direction corresponding to the nth reference signal resource (two polarization directions share the same spatial domain basis vector), and f represents the frequency domain basis vector sequence number (e.g., the frequency domain basis vector in the fth row or the conjugate transpose of the frequency domain basis vector in the fth row in the frequency domain matrix 2 in Figure 3b), i.e., the coefficient C l,i,f,n The frequency domain basis vectors corresponding to the l-th transmission layer and the n-th reference signal resource are v is the fth frequency-domain basis vector among the selected frequency-domain basis vectors, where f is 0, 1, . . . , Mv Set to -1, M v represents the number of frequency domain basis vectors, and n represents the sequence number of the N reference signal resources. Optionally, n may be set to 1, 2, . . . , N, or n may be set to 0, 1, . . . , N-1, or n may be set to another value. G(n) indicates the priority of the nth reference signal resource among the N reference signal resources. Optionally, the reference signal resource ranking mapping relationship G(n) may be determined by referring to any one or more items of the second preset rule described above. L max is an integer equal to or greater than the maximum number of spatial domain basis vectors corresponding to N reference signal resources, and Y is M v Alternatively, Y is an integer greater than or equal to N3, where N3 is the number of subbands or the number of frequency domain units, π(f) represents a first remapping function used to remap the sequence numbers or indices of the frequency domain basis vectors selected for the lth transmission layer and the nth reference signal resource, and Pri(l,i,f,n) represents the priority of a coefficient corresponding to a given combination of the lth transmission layer, the nth reference signal resource, the ith spatial domain basis vector, and the fth frequency domain basis vector, i.e., the coefficient corresponding to the ith spatial domain basis vector and the fth frequency domain basis vector of the nth reference signal resource corresponding to the lth transmission layer.

[0209] In addition,

number

[0210] The sequence numbers of the spatial domain basis vectors / reference signal ports, the sequence numbers of the frequency domain basis vectors, and the sequence numbers of the reference signal resources (value of n) are calculated using the above function Pri(l,i,f,n)=2L maxSee the corresponding explanation of ·X·v·π(f)+v·φ(i,n)+l, the details of which will not be repeated here.

[0211] Optionally, in addition to the above-mentioned several definition methods, the first remapping function π(f) can be further defined as follows: since the reference signal resource dimension is the dimension that is primarily considered, the remapping does not need to be performed in the frequency domain, that is, the first remapping function π(f) can be defined according to π(f)=f. In this case, the value range of π(f) is 0 to M v -1, and the value of Y is a positive integer greater than or equal to M.

[0212] For example, in the case of a multi-station codebook based on Rel-17 FeType-II, a sequence number combination (l,i,f,n) may be given. The priority of the coefficients corresponding to the combination is determined based on a priority function Pri(l,i,f,n), and the priorities of the amplitude, phase, and position indication information of the coefficients are also determined accordingly. The smaller the value of Pri(l,i,f,n), the higher the priority of the amplitude, phase, and position indication information of the coefficients corresponding to the combination, and the higher the priority is reported. For simplicity of description, the coefficients corresponding to the lth transmission layer, the nth reference signal resource, the ith spatial domain basis vector, and the fth frequency domain basis vector used to determine the precoding matrix are denoted by C l,i,f,n Specifically, one of the M coefficients, C l,i,f,n The priority function of is Pri(l,i,f,n)=K 1,max v Y G(n)+K 1,max ·v·φf+v·i+l is satisfied, where l represents the transmission layer sequence number, l is set to 1, 2, ···, v, v represents the number of transmission layers, i represents the sequence number of the reference signal port, i is set to 0, 1, ···, K 1,n -1, specifically, the coefficient C l,i,f,n The reference signal port corresponding to the nth reference signal resource is 1,n is the i-th reference signal port among the K selected reference signal ports, 1,nrepresents the number of selected reference signal ports corresponding to the nth reference signal resource, f represents the frequency domain basis vector sequence number, and f ranges from 0, 1, . . . , M v -1, specifically, the coefficient C l,i,f,n The frequency domain basis vectors corresponding to the l-th transmission layer and the n-th reference signal resource are v is the fth frequency domain basis vector among the selected frequency domain basis vectors, and M v represents the number of frequency domain basis vectors, and n represents the sequence number of the N reference signal resources. Optionally, n may be set to 1, 2, . . ., N, or n may be set to 0, 1, . . ., N-1, or n may be set to another value. G(n) indicates the priority of the nth reference signal resource among the N reference signal resources. Optionally, the reference signal resource ranking mapping relationship G(n) may be determined by referring to any one or more items of the second preset rule described above. K 1,max is an integer equal to or greater than the maximum number of selected reference signal ports corresponding to the N reference signal resources, and Y is M v where Pri(l,i,f,n) represents the priority of a coefficient corresponding to a given combination of the l-th transmission layer, the n-th reference signal resource, the i-th reference signal port, and the f-th frequency-domain basis vector.

[0213] In addition,

number

[0214] The sequence numbers of the spatial domain basis vectors / reference signal ports, the sequence numbers of the frequency domain basis vectors, and the sequence numbers of the reference signal resources (value of n) are calculated using the above function Pri(l,i,f,n)=2L maxSee the corresponding explanation of ·X·v·π(f)+v·φ(i,n)+l, the details of which will not be repeated here.

[0215] It can be seen that in the method in which the reference signal resource dimension is used as the preferentially considered dimension, the priority definition method of the multi-station codebook based on Rel-17 FeType-II can be similar to that of the multi-station codebook based on Rel-16 eType-II, with the main difference being that in the priority definition method of the multi-station codebook based on Rel-17 FeType-II, the spatial domain basis vector sequence number is replaced by the selected reference signal port sequence number, and further, in the priority definition method of the multi-station codebook based on Rel-17 FeType-II, since the number of frequency domain basis vectors is small, no frequency domain replacement may be performed.

[0216] In the above, a multi-station codebook based on Rel-16 eType-II and a multi-station codebook based on Rel-17 FeType-II are used as examples to separately describe two coefficient priority definition methods: a method in which the UE uses the frequency domain dimension as the dimension to be prioritized and a method in which the UE uses the reference signal resource dimension as the dimension to be prioritized. Note that a UE may only support the method in which the frequency domain dimension is used as the dimension to be prioritized or the method in which the reference signal resource dimension is used as the dimension to be prioritized, or may support both methods. If a specific condition is satisfied, the UE may select one of the methods to define coefficient priorities. For example, the protocol may specify whether the UE uses the frequency domain dimension as the dimension to be prioritized or the reference signal resource dimension as the dimension to be prioritized for defining coefficient priorities during CSI reporting. Alternatively, the base station may configure the method. For example, the base station may use specific configuration information to instruct the UE to use the frequency domain dimension as the preferentially considered dimension or the reference signal resource dimension as the preferentially considered dimension to define the priority of coefficients during CSI reporting. Alternatively, the UE may select a coefficient priority definition method based on the actual situation of the communication network and report the selected method to the base station by using method indication information. For example, the UE may add 1-bit method indication information to CSI Part 2. When the method indication information has a third value (e.g., 0 or 1), it indicates that the priority is defined by using the frequency domain dimension as the preferentially considered dimension. When the method indication information has a fourth value (e.g., 1 or 0), it indicates that the priority is defined by using the reference signal resource dimension as the preferentially considered dimension. It may be understood that the location of the method indication information in CSI Part 2 needs to be placed before the indication information of the M coefficients, or that the method indication information and the indication information of the coefficient with the highest priority among the M coefficients need to be placed at the same level in CSI Part 2.

[0217] For example, the UE may select a coefficient priority definition method based on the actual situation of the communication network. For example, after measuring the channel state information of multiple TRPs, the UE may select a corresponding coefficient priority definition method based on the difference in channel strength between the TRPs. For example, if the difference in channel strength between the TRPs is not large (e.g., is less than a certain threshold), the UE may define the coefficient priorities in a manner in which the frequency domain dimension is used as the preferred dimension and report the coefficients of each TRP as much as possible. In this case, the priorities of the M coefficients satisfy any one of the following equations:

number

[0218] If the difference in channel strength between TRPs is large (e.g., equal to or greater than a threshold), the UE may choose to define the priorities of the coefficients in a manner that uses the reference signal resource dimension as the preferred dimension and report the coefficients corresponding to the TRPs with stronger channels. In this case, the priorities of the M coefficients satisfy one of the following equations:

number

[0219] It should be noted that all the above embodiments are extended to the case where the precoding matrix is ​​reported by using PMI. The solution in this application is also applicable to the case where the channel matrix is ​​reported by using PMI, in which the transmission layer is replaced by the receiving antenna port, the number of the transmission layer corresponds to the number of the receiving antenna port, and the l-th transmission layer corresponds to the l-th receiving antenna port. In other words, the channel matrix is The coefficient priority definition solution in the above embodiment, which is carried out when reporting by using PMI instead of precoding matrix, should also fall within the protection scope of the present application.

[0220] The above content describes in detail the method provided in the present application. To facilitate the implementation of the aforementioned solution in the embodiments of the present application, the embodiments of the present application further provide a corresponding apparatus or device.

[0221] In the present application, the device is divided into functional modules according to the above-described method embodiment. For example, functional modules corresponding to functions may be obtained by division, or two or more functions may be integrated into one processing module. The integrated module may be implemented in the form of hardware or in the form of a software functional module. Note that in the present application, module division is an example and is merely a logical functional division. In actual implementation, other division methods may be used. Hereinafter, the device in the embodiment of the present application will be described with reference to the accompanying drawings.

[0222] 7 is a structural diagram of a communication device according to an embodiment of the present application. The communication device 10 may be configured to implement the functions of the UE or access network device in the aforementioned method embodiment, and thus may also achieve the advantageous effects of the aforementioned method embodiment. In this embodiment of the present application, the communication device 10 may be one of the terminals 120a-120j in FIG. 1a, or may be a module (e.g., a chip) used in a terminal.

[0223] As shown in FIG. 7, the communication device 10 may include a processing unit 100, a transmitting unit 101, and a receiving unit 102. The communication device 10 may be configured to implement the functionality of the UE in the embodiment of the method shown in FIG. 4. The receiving unit 102 may be configured to receive a reference signal on N reference signal resources. The processing unit 100 may be configured to determine indication information of M coefficients based on the reference signal on the N reference signal resources, where priorities of the M coefficients are determined based on priorities of the N reference signal resources, where M and N are both integers greater than 1, and the M coefficients are used to determine a precoding matrix. The transmitting unit 101 may be configured to transmit first information, where the first information includes indication information of K coefficients, where the K coefficients are determined from the M coefficients based on priorities of the M coefficients, where K is a positive integer less than or equal to M.

[0224] 8 is a structural diagram of another communication device according to an embodiment of the present application. The communication device 20 may be configured to implement the functions of the access network device (base station) in the above-mentioned method embodiment, and thus can also realize the advantageous effects of the above-mentioned method embodiment. In this embodiment of the present application, the communication device 20 may be the radio access network device 110a or 110b shown in FIG. 1a.

[0225] As shown in FIG. 8, the communication device 20 may include a processing unit 201, a receiving unit 200, and a transmitting unit 202. The communication device 20 may be configured to implement the functions of the access network device (base station) in the embodiment of the method shown in FIG. 4. The processing unit 201 may be configured to generate a reference signal. The transmitting unit 202 may be configured to transmit the reference signal on a reference signal resource. The receiving unit 200 may be configured to receive first information, where the first information includes indication information of K coefficients, the K coefficients being determined from the M coefficients based on priorities of the M coefficients, the reference signal resource being any one of the N reference signal resources, M and N being integers greater than 1, K being a positive integer less than or equal to M, the priorities of the M coefficients being determined based on the priorities of the N reference signal resources, and the M coefficients being used to determine a precoding matrix.

[0226] In a possible implementation, the processing unit 201 may be further configured to determine a precoding matrix based on the indication information of the K coefficients included in the first information.

[0227] In a possible implementation, the priorities of the M coefficients are further determined based on one or more of a transmission layer sequence number, a spatial domain basis vector sequence number, a reference signal port sequence number, and a frequency domain basis vector sequence number.

[0228] In a possible implementation, the priority of a coefficient associated with a spatial domain basis vector or reference signal port corresponding to any one of the N reference signal resources is determined as follows: If the priority of the n1-th reference signal resource among the N reference signal resources is higher than the priority of the n2-th reference signal resource among the N reference signal resources, the priority of a coefficient associated with any spatial domain basis vector corresponding to the n1-th reference signal resource is higher than the priority of a coefficient associated with any spatial domain basis vector corresponding to the n2-th reference signal resource, or the priority of a coefficient associated with any reference signal port corresponding to the n1-th reference signal resource is higher than the priority of a coefficient associated with any reference signal port corresponding to the n2-th reference signal resource, or If the priority of the n1-th reference signal resource among the N reference signal resources is higher than the priority of the n2-th reference signal resource among the N reference signal resources, the priority of a coefficient associated with the i-th spatial domain basis vector corresponding to the n1-th reference signal resource is higher than the priority of a coefficient associated with the i-th spatial domain basis vector corresponding to the n2-th reference signal resource having the same sequence number, or the priority of a coefficient associated with the i-th reference signal port corresponding to the n1-th reference signal resource is higher than the priority of a coefficient associated with the i-th reference signal port corresponding to the n2-th reference signal resource having the same sequence number, where i represents the sequence number of the spatial domain basis vector or the reference signal port. The decision is made according to one or more of the first preset rules:

[0229] In a possible implementation, the priorities of the M coefficients are:

number

[0230] In a possible implementation, φ(i,n) satisfies one of the following equations:

[0231]

number

[0232]

number

[0233]

number

[0234] In a possible implementation, if the priority of the n1-th reference signal resource among the N reference signal resources is higher than the priority of the n2-th reference signal resource among the N reference signal resources, the priority of any coefficient associated with the n1-th reference signal resource is higher than the priority of any coefficient associated with the n2-th reference signal resource.

[0235] In a possible implementation, the priorities of the M coefficients are:

number

[0236] In a possible implementation, π(f) is The formula π(f)=f,

number

number

number

number

[0237] In a possible implementation, the priorities of the M coefficients are:

number

[0238] In a possible implementation, the priorities of the M coefficients are:

number

[0239] In a possible implementation, φ(i,n) is

number

number

number

number

[0240] In a possible implementation, the smaller the value of Pri(l,i,f,n), the higher the priority of the coefficient corresponding to a given sequence number combination of the lth transmission layer, the nth reference signal resource, the ith spatial domain basis vector or reference signal port, and the fth frequency domain basis vector.

[0241] In a possible implementation, the priorities of the N reference signal resources are: A reference signal resource corresponding to a larger number of spatial domain basis vectors or a reference signal resource from which a larger number of reference signal ports are selected has a higher priority. The reference signal resource corresponding to the larger amplitude of the strongest coefficient has a higher priority. A reference signal resource corresponding to a higher signal strength of the reference signal has a higher priority, or A reference signal resource corresponding to a lower sequence number of the reference signal resource has a higher priority. The decision is made according to one or more of the second preset rules:

[0242] In a possible implementation, the smaller the value of G(n), the higher the priority of the nth reference signal resource.

[0243] In a possible implementation, the indication of any one of the aforementioned coefficients comprises one or more of an indication of the amplitude of the coefficient, an indication of the phase of the coefficient, and an indication of the position of the coefficient.

[0244] In a possible implementation, the smaller the value of φ(i,n), the higher the priority of the coefficient set associated with the i-th spatial domain basis vector or reference signal port corresponding to the n-th reference signal resource.

[0245] In a possible implementation, when the preset condition is satisfied, the priority of the M coefficients is determined based on a function corresponding to the preset condition among the preset functions, and the preset function is:

number

[0246] In the above-mentioned device embodiment, for descriptions of reference signal resources, CSI, etc., please refer to the descriptions in the above-mentioned method embodiment (including FIG. 4), and the details will not be described again here.

[0247] It can be understood that the specific descriptions of the receiving unit, the transmitting unit, and the processing unit shown in the above-mentioned device embodiments are only examples. For the specific functions of the receiving unit, the transmitting unit, and the processing unit, the steps performed by the receiving unit, the transmitting unit, and the processing unit, etc., please refer to the above-mentioned method embodiments. The details will not be described again here.

[0248] The above describes a communication device in the embodiment of the present application. The following describes possible product forms of the communication device. It should be understood that any product having the functions of the communication device described in FIG. 7 or FIG. 8 should fall within the scope of protection of the embodiment of the present application, regardless of its form. Furthermore, it should be understood that the following description is merely an example, and the product form of the communication device in the embodiment of the present application is not so limited.

[0249] In a possible implementation, in the communication device shown in FIG. 7 or FIG. 8, the processing unit 100 or the processing unit 201 may be one or more processors, and the transmitting unit 101, the receiving unit 102, the transmitting unit 202, or the receiving unit 200 may be transceivers. Alternatively, the transmitting unit 101 and the transmitting unit 202 may be transmitters, and the receiving unit 102 and the receiving unit 200 may be receivers. In the embodiments of the present application, the processor and the transceiver may be coupled together. The connection between the processor and the transceiver is not limited to the embodiments of the present application. In the process of performing the above-described method, the process of transmitting information in the above-described method can be understood as the process of outputting information by the processor. When outputting information, the processor outputs the information to the transceiver, and the transceiver thereby transmits the information. After the information is output by the processor, other processing may need to be performed on the information before it arrives at the transceiver. Similarly, the process of receiving information in the above-described method can be understood as the process of receiving input information by the processor. When the processor receives input information, the transceiver receives the information and inputs the information to the processor. Furthermore, after the transceiver receives the information, other processing may need to be performed on the information before it is input to the processor.

[0250] 9 is a diagram of another communication device structure according to an embodiment of the present application. The communication device 30 may be the communication device 10, the communication device 20, or a chip within the communication device 10 or the communication device 20. 9 shows only the main components within the communication device 30. In addition to the processor 1001 and the transceiver 1002, the communication device 30 may further include a memory 1003 and input / output devices (not shown).

[0251] The processor 1001 is mainly configured to process communication protocols and communication data, control the entire communication device, execute software programs, and process data of the software programs. The memory 1003 is mainly configured to store software programs and data. The transceiver 1002 may include a control circuit and an antenna. The control circuit is mainly configured to convert between baseband signals and radio frequency signals and process the radio frequency signals. The antenna is mainly configured to receive and transmit radio frequency signals in the form of electromagnetic waves. The input / output device, such as a touch screen, display, or keyboard, is configured to receive data input by a user and output data to a user.

[0252] After the communication device is powered on, the processor 1001 can read the software program in the memory 1003, interpret and execute the instructions of the software program, and process data of the software program. When data needs to be transmitted wirelessly, the processor 1001 performs baseband processing on the data to be transmitted and then outputs the baseband signal to the radio frequency circuit. The radio frequency circuit performs radio frequency processing on the baseband signal and then transmits the radio frequency signal in the form of electromagnetic waves through an antenna. When data is to be transmitted to the communication device, the radio frequency circuit receives the radio frequency signal through the antenna, converts the radio frequency signal into a baseband signal, and outputs the baseband signal to the processor 1001. The processor 1001 converts the baseband signal into data and processes the data.

[0253] In other implementations, the radio frequency circuitry and antenna may be located independently from the processor that performs the baseband processing, for example, in a distributed scenario, the radio frequency circuitry and antenna may be located remotely and independently from the communication device.

[0254] The transceiver 1002 may include a receiver and a transmitter. The receiver is configured to perform receiving functions (or operations), and the transmitter is configured to perform transmitting functions (or operations). Furthermore, the transceiver is configured to communicate with other devices / apparatuses over a transmission medium.

[0255] The processor 1001, the transceiver 1002, and the memory 1003 may be connected via a communication bus.

[0256] For example, when the communication device 30 is configured to perform the steps, methods, or functions performed by the communication device 10, the transceiver 1002 is configured to receive a reference signal on N reference signal resources, the processor 1001 is configured to determine indication information of M coefficients based on the reference signal on the N reference signal resources, where the priorities of the M coefficients are determined based on the priorities of the N reference signal resources, where M and N are both integers greater than 1, the M coefficients are used to determine a precoding matrix, and the transceiver 1002 is further configured to transmit first information, where the first information includes indication information of K coefficients, where the K coefficients are determined from the M coefficients based on the priorities of the M coefficients, where K is a positive integer less than or equal to M.

[0257] For example, when communication device 30 is configured to perform the steps, methods, or functions performed by communication device 20, processor 1001 is configured to generate a reference signal, transceiver 1002 is configured to transmit the reference signal on a reference signal resource, and transceiver 1002 is further configured to receive first information, where the first information includes indication information of K coefficients, the K coefficients being determined from the M coefficients based on priorities of the M coefficients, the reference signal resource being any one of N reference signal resources, M and N are both integers greater than 1, K is a positive integer less than or equal to M, the priorities of the M coefficients are determined based on the priorities of the N reference signal resources, and the M coefficients are used to determine a precoding matrix. Optionally, processor 1001 is further configured to determine a precoding matrix based on the indication information of the K coefficients included in the first information.

[0258] In this embodiment of the present application, for descriptions of reference signal resources, CSI, etc., please refer to the descriptions in the previous embodiments (including FIG. 4). Details will not be described again here. For specific descriptions of the processor and transceiver, please refer to the descriptions of the processing unit, receiving unit, and transmitting unit shown in FIG. 7 or FIG. 8. Details will not be described again here.

[0259] Optionally, the processor 1001 may include a transceiver configured to implement receiving and transmitting functions. For example, the transceiver may be a transceiver circuit, an interface, or an interface circuit. The transceiver circuit, interface, or interface circuit configured to implement receiving and transmitting functions may be separate or may be integrated. The transceiver circuit, interface, or interface circuit may be configured to write and read code / data. Alternatively, the transceiver circuit, interface, or interface circuit may be configured to transmit or forward signals.

[0260] Optionally, the processor 1001 may store instructions. The instructions may be a computer program. The computer program is executed by the processor 1001 to enable the communication device 30 to perform the methods described in the above method embodiments. The computer program may be fixed in the processor 1001. In this case, the processor 1001 may be implemented by hardware.

[0261] In some implementations, the communication device 30 may include circuitry. The circuitry may implement the transmitting, receiving, or communication functions of the aforementioned method embodiments. The processors and transceivers described herein may be implemented in integrated circuits (ICs), analog ICs, radio frequency integrated circuits (RFICs), mixed-signal ICs, application specific integrated circuits (ASICs), printed circuit boards (PCBs), electronic devices, etc. The processors and transceivers may alternatively be fabricated using various IC technologies, such as complementary metal oxide semiconductor (CMOS), n-channel metal oxide semiconductor (nMOS), p-channel metal oxide semiconductor (PMOS), bipolar junction transistor (BJT), bipolar CMOS (BiCMOS), silicon germanium (SiGe), and gallium arsenide (GaAs).

[0262] It can be understood that the communication device described in this embodiment of the present application may further include more components than those shown in Fig. 9, etc. This is not limited in the embodiment of the present application. The above-mentioned method performed by the processor and the transceiver is merely an example. For specific steps performed by the processor and the transceiver, please refer to the description in the above-mentioned embodiment of the method.

[0263] In another possible implementation, in the communication device shown in FIG. 7 or FIG. 8, the processing unit 100 or the processing unit 201 may be one or more logic circuits, and the transmitting unit 101, the receiving unit 102, the transmitting unit 202, or the receiving unit 200 may be an input / output interface, or may be referred to as a communication interface, an interface circuit, an interface, etc. Alternatively, the transmitting unit may be an output interface, and the receiving unit may be an input interface, and the transmitting unit and the receiving unit may be combined into one unit, for example, an input / output interface. FIG. 10 is a diagram of the structure of yet another communication device according to an embodiment of the present application. As shown in FIG. 10, the communication device 40 includes a logic circuit 901 and an interface 902. Specifically, the processing unit 100 or the processing unit 201 may be implemented by using the logic circuit 901, and the transmitting unit 101, the receiving unit 102, the transmitting unit 202, or the receiving unit 200 may be implemented by using the interface 902. The logic circuit 901 may be a chip, a processing circuit, an integrated circuit, a system on chip (SoC) chip, etc. The interface 902 may be a communication interface, an input / output interface, a pin, etc. For example, FIG. 10 illustrates an example in which the communication device 40 is a chip. The chip includes the logic circuit 901 and the interface 902.

[0264] In this embodiment of the present application, the logic circuit and the interface may be coupled to each other, and the specific manner of connection between the logic circuit and the interface is not limited in this embodiment of the present application.

[0265] For example, when communication device 40 is configured to perform the method, function, or step performed by communication device 10, interface 902 is configured to receive a reference signal on N reference signal resources, logic circuit 901 is configured to determine indication information of M coefficients based on the reference signal on the N reference signal resources, where priorities of the M coefficients are determined based on the priorities of the N reference signal resources, where M and N are both integers greater than 1, the M coefficients are used to determine a precoding matrix, and interface 902 is further configured to transmit first information, where the first information includes indication information of K coefficients, where the K coefficients are determined from the M coefficients based on the priorities of the M coefficients, and K is a positive integer less than or equal to M.

[0266] For example, when communication device 40 is configured to perform the steps, methods, or functions performed by communication device 20, logic circuit 901 is configured to generate a reference signal, interface 902 is configured to transmit the reference signal on a reference signal resource, and interface 902 is further configured to receive first information, where the first information includes indication information of K coefficients, the K coefficients being determined from the M coefficients based on priorities of the M coefficients, the reference signal resource being any one of N reference signal resources, M and N are both integers greater than 1, K is a positive integer less than or equal to M, the priorities of the M coefficients are determined based on the priorities of the N reference signal resources, and the M coefficients are used to determine a precoding matrix. Optionally, logic circuit 901 is further configured to determine a precoding matrix based on the indication information of the K coefficients included in the first information.

[0267] In this embodiment of the present application, for descriptions of reference signal resources, CSI, etc., please refer to the descriptions in the preceding method embodiments (including FIG. 4). Details will not be described again here. For specific descriptions of the logic circuit 901 and the interface 902, please refer to the descriptions of the processing unit, transmitting unit, and receiving unit shown in FIG. 7 or FIG. 8. Details will not be described again here.

[0268] The communication device shown in the embodiment of the present application may implement the method provided in the embodiment of the present application in the form of hardware, or may implement the method provided in the embodiment of the present application in the form of software, which is not limited to the embodiment of the present application.

[0269] For specific implementation of the embodiment shown in Figure 10, please refer to the above-mentioned embodiment, and the details will not be described again here.

[0270] An embodiment of the present application further provides a wireless communication system, which includes a communication device 10 and a communication device 20. The communication device 10 and the communication device 20 may be configured to perform the method in any one of the previous embodiments (FIG. 4).

[0271] Additionally, the present application further provides computer programs, which can be used to implement the actions and / or processes performed by the communication device 10 in the methods provided herein.

[0272] The present application further provides computer programs that can be used to implement the actions and / or processes performed by the communication device 20 in the methods provided herein.

[0273] The present application further provides a readable storage medium having computer code stored thereon that, when executed by a computer, enables the computer to perform the actions and / or processes performed by the communication device 10 in the methods provided herein.

[0274] The present application further provides a readable storage medium having computer code stored thereon that, when executed by a computer, enables the computer to perform the actions and / or processes performed by communication device 20 in the methods provided herein.

[0275] The present application further provides a computer program product, which includes computer code or a computer program that, when executed by a computer, performs the actions and / or processes performed by the communication device 10 in the methods provided herein.

[0276] The present application further provides a computer program product, which includes computer code or a computer program that, when executed by a computer, performs the actions and / or processes performed by the communication device 20 in the methods provided herein.

[0277] In some embodiments provided herein, it should be understood that the disclosed systems, devices, and methods may be implemented in other manners. For example, the described device embodiments are merely examples. For example, the division into units is merely a logical division of function, and other divisions may be used in actual implementation. For example, multiple units or components may be combined or integrated into another system, or some features may be omitted or not implemented. Furthermore, the shown or described mutual couplings, direct couplings, or communication connections may be realized by some interfaces, indirect couplings or communication connections between devices or units, or electrical, mechanical, or other types of connections.

[0278] The units described as separate parts may or may not be physically separated, and the parts shown as units may or may not be physical units, and may be located in one place or distributed over multiple network units. Some or all of the units may be selected based on actual requirements to achieve the technical effects of the solutions provided in the embodiments of the present application.

[0279] Furthermore, the functional units in the embodiments of the present application may be integrated into one processing unit, or each unit may exist physically alone, or two or more units may be integrated into one unit. The integrated unit may be implemented in the form of hardware or in the form of a software functional unit.

[0280] When an integrated unit is implemented in the form of a software functional unit and sold or used as an independent product, the integrated unit may be stored in a computer-readable storage medium. Based on this understanding, the technical solution of the present application may essentially be implemented in the form of a software product, or a portion of the technical solution, or all or part of the technical solution. The computer software product is stored in a readable storage medium and includes a plurality of instructions for instructing a computer device (which may be a personal computer, a server, or a network device) to perform all or part of the steps of the method described in the embodiments of the present application. The readable storage medium includes any medium capable of storing program code, such as a USB flash drive, a removable hard disk, a read-only memory (ROM), a random access memory (RAM), a magnetic disk, or an optical disk.

[0281] The above description is merely a specific implementation of the present application and is not intended to limit the scope of protection of the present application. Any modifications or replacements that can be easily conceived by those skilled in the art within the technical scope disclosed in the present application should fall within the scope of protection of the present application. Therefore, the scope of protection of the present application should be subject to the scope of protection of the claims.

[0282] This application claims priority to Chinese Patent Application No. 202310127389.5, filed with the State Intellectual Property Office of the People's Republic of China on February 3, 2023, for the invention entitled "CHANNEL STATE INFORMATION REPORTING METHOD, APPARATUS, AND READABLE STORAGE MEDIUM," the entire text of which is incorporated herein by reference.

Claims

1. A channel state information reporting method, comprising: receiving a reference signal on N reference signal resources; determining indication information of M coefficients based on reference signals on the N reference signal resources, where priorities of the M coefficients are determined based on priorities of the N reference signal resources, where M and N are integers greater than 1, and the M coefficients are used to determine a precoding matrix; transmitting first information, the first information including indication information of K coefficients, the K coefficients being determined from the M coefficients based on priorities of the M coefficients, where K is a positive integer less than or equal to M; A method having the following.

2. A channel state information reporting method, comprising: transmitting a reference signal on a reference signal resource; receiving first information, the first information including indication information of K coefficients, the K coefficients being determined from the M coefficients based on priorities of the M coefficients, the reference signal resource being one of N reference signal resources, M and N being integers greater than 1, K being a positive integer less than or equal to M, the priorities of the M coefficients being determined based on priorities of the N reference signal resources, and the M coefficients being used to determine a precoding matrix; A method having the following.

3. The method comprises: determining the precoding matrix based on the indication of the K coefficients included in the first information; The method of claim 2.

4. the priorities of the M coefficients are further determined based on one or more of a transmission layer sequence number, a spatial domain basis vector sequence number, a reference signal port sequence number, and a frequency domain basis vector sequence number; 4. The method according to any one of claims 1 to 3.

5. The priority of a coefficient associated with a spatial domain basis vector or a reference signal port corresponding to any one of the N reference signal resources is determined as follows: n of the N reference signal resources １ The priority of the nth reference signal resource is ２ If the priority of the nth reference signal resource is higher than the priority of the nth reference signal resource, １ The priority of a coefficient associated with any spatial domain basis vector corresponding to the nth reference signal resource is ２ higher than the priority of the coefficient associated with any spatial domain basis vector corresponding to the nth reference signal resource, or １ The priority of a coefficient associated with any reference signal port corresponding to the nth reference signal resource is ２ higher than the priority of the coefficient associated with any reference signal port corresponding to the th reference signal resource, or n of the N reference signal resources １ The priority of the nth reference signal resource is ２ If the priority of the nth reference signal resource is higher than the priority of the nth reference signal resource, １ The priority of the coefficient associated with the i-th spatial domain basis vector corresponding to the i-th reference signal resource is determined by the n ２ higher than the priority of the coefficient associated with the i-th spatial domain basis vector corresponding to the n-th reference signal resource, or １ The priority of the coefficient associated with the i-th reference signal port corresponding to the i-th reference signal resource is determined by the n ２ higher than the priority of a coefficient associated with the i-th reference signal port corresponding to the i-th reference signal resource, where i represents a sequence number of the spatial domain basis vector or the reference signal port. The first predetermined rule is determined according to any one or more items of the first predetermined rule:

5. The method according to any one of claims 1 to 4.

6. The priorities of the M coefficients are [Equation 1] where l represents the transmission layer sequence number, l is set to 1, 2, ..., v, v represents the number of transmission layers, i represents the spatial domain basis vector sequence number, i is set to 0, 1, ..., 2L ｎ Set to -1, L ｎ represents the number of spatial domain basis vectors corresponding to the nth reference signal resource, f represents the frequency domain basis vector sequence number, and f is 0, 1, ..., M ｖ -1, M ｖ represents the number of frequency domain basis vectors, n represents the sequence number of the N reference signal resources, φ(i,n) represents the priority of the coefficient set associated with the i-th spatial domain basis vector corresponding to the n-th reference signal resource, and φ(i,n)<2L ｍａｘ Satisfies X, where X is an integer equal to or greater than N, and L ｍａｘ is greater than or equal to the maximum number of spatial domain basis vectors corresponding to the N reference signal resources, respectively; π(f) represents a first remapping function used to remap sequence numbers or indices of frequency domain basis vectors selected for the l-th transmission layer and the n-th reference signal resource; and Pri(l,i,f,n) represents a priority of a coefficient corresponding to a given combination of the l-th transmission layer, the n-th reference signal resource, the i-th spatial domain basis vector, and the f-th frequency domain basis vector.

6. The method according to any one of claims 1 to 5.

7. φ(i, n) is [Equation 2] where G(n) represents the priority of the n-th reference signal resource among the N reference signal resources, and L ｍａｘ is equal to or greater than the maximum number of spatial domain basis vectors corresponding to the N reference signal resources, respectively, and i represents the spatial domain basis vector sequence number, where i is 0, 1, ..., 2L. ｎ Set to -1, L ｎ represents the number of spatial domain basis vectors corresponding to the n-th reference signal resource, [Equation 3] where G(n) represents the priority of the n-th reference signal resource among the N reference signal resources, i represents the spatial domain basis vector sequence number, and i is 0, 1, ..., 2L ｎ Set to -1, L ｎ represents the number of spatial domain basis vectors corresponding to the n-th reference signal resource, and φ ｎ (i) = i or φ ｎ (i) = i + 2L ｍａｘ -2L ｎ and φ ｎ (i) represents a second remapping function, used to remap the spatial domain basis vector sequence numbers; or [Equation 4] is the formula, and a ｎ is a positive integer of 1 or more, and L ｎ is directly proportional to the value of ｎ The greatest common divisor of is 1, and i represents the spatial domain basis vector sequence number, where i is 0, 1, . . . , 2L. ｎ Set to -1, L ｎ represents the number of spatial domain basis vectors corresponding to the n-th reference signal resource, and a ｍａｘ is all a ｎ The maximum value of Satisfy one of the following: The method of claim 6.

8. n of the N reference signal resources １ The priority of the nth reference signal resource is ２ If the priority of the reference signal resource is higher than the priority of the n １ The priority of any coefficient associated with the nth reference signal resource is ２ higher than the priority of any coefficient associated with the th reference signal resource, 5. The method according to any one of claims 1 to 4.

9. The priorities of the M coefficients are [Equation 5] where l represents the transmission layer sequence number, l is set to 1, 2, ..., v, v represents the number of transmission layers, i represents the spatial domain basis vector sequence number, i is set to 0, 1, ..., 2L ｎ Set to -1, L ｎ represents the number of spatial domain basis vectors corresponding to the nth reference signal resource, f represents the frequency domain basis vector sequence number, and f is 0, 1, ..., M ｖ -1, M ｖ represents the number of frequency domain basis vectors, n represents the sequence number of the N reference signal resources, G(n) represents the priority of the n-th reference signal resource among the N reference signal resources, and L ｍａｘ is equal to or greater than the maximum number of spatial domain basis vectors corresponding to the N reference signal resources, respectively, and Y is M ｖ or Y is an integer equal to or greater than N ３ is an integer equal to or greater than N ３ where π(f) represents the number of subbands or frequency domain units, π(f) represents a first remapping function used to remap sequence numbers or indices of frequency domain basis vectors selected for the l-th transmission layer and the n-th reference signal resource, and Pri(l,i,f,n) represents the priority of a coefficient corresponding to a given combination of the l-th transmission layer, the n-th reference signal resource, the i-th spatial domain basis vector, and the f-th frequency domain basis vector.

9. The method according to any one of claims 1 to 4 and 8.

10. π(f) is The formula π(f) = f, [Equation 6] This is the formula, [Equation 7] and k ３，ｌ，ｎ （ｆ） represents the index of the f-th frequency domain basis vector of the n-th reference signal resource corresponding to the l-th transmission layer in the universal set of frequency domain basis vectors; k ３，ｌ，ｎ （ｆｌ＊） represents the original index of the frequency domain basis vector corresponding to the strongest coefficient among the N reference signal resources corresponding to the l-th transmission layer, and f ｌ ＊ represents the sequence number of the frequency domain basis vector corresponding to the strongest coefficient of the l-th transmission layer, and n ＊ represents the reference signal resource sequence number corresponding to the strongest coefficient of the l-th transmission layer, or [Equation 8] This is the formula, [Equation 9] and k ３，ｌ，ｎ （ｆ） represents the index of the f-th frequency domain basis vector of the n-th reference signal resource corresponding to the l-th transmission layer in the universal set of frequency domain basis vectors; k ３，ｌ，ｎ （ｆｌ，ｎ＊） represents the original index of the frequency domain basis vector corresponding to the strongest coefficient of the n-th reference signal resource corresponding to the l-th transmission layer, and f ｌ，ｎ ＊ represents the sequence number of the frequency domain basis vector corresponding to the strongest coefficient of the n-th reference signal resource corresponding to the l-th transmission layer, Satisfy one of the following:

10. The method of any one of claims 6, 7 and 9.

11. The smaller the value of Pri(l, i, f, n), the higher the priority of a coefficient corresponding to a given sequence number combination of the l transmission layer, the n reference signal resource, the i spatial domain basis vector or reference signal port, and the f frequency domain basis vector.

11. The method according to any one of claims 6 to 10.

12. The priorities of the N reference signal resources are A reference signal resource corresponding to a larger number of spatial domain basis vectors or a reference signal resource from which a larger number of reference signal ports are selected has a higher priority. The reference signal resource corresponding to the larger amplitude of the strongest coefficient has a higher priority. A reference signal resource corresponding to a higher signal strength of the reference signal has a higher priority, or A reference signal resource corresponding to a lower sequence number of the reference signal resource has a higher priority. The second predetermined rule is determined according to any one or more of the following:

12. The method according to any one of claims 1 to 11.

13. The smaller the value of G(n), the higher the priority of the n-th reference signal resource.

10. The method of claim 7 or 9.

14. A communication device, a receiving unit configured to receive a reference signal on the N reference signal resources; a processing unit configured to determine indication information of M coefficients based on reference signals on the N reference signal resources, where priorities of the M coefficients are determined based on priorities of the N reference signal resources, where M and N are both integers greater than 1, and the M coefficients are used to determine a precoding matrix; and a transmitting unit configured to transmit first information, the first information including indications of K coefficients, the K coefficients being determined from the M coefficients based on priorities of the M coefficients, where K is a positive integer less than or equal to M; A device having:

15. A communication device, a processing unit configured to generate a reference signal; a transmitting unit configured to transmit the reference signal on a reference signal resource; a receiving unit configured to receive first information, the first information including indication information of K coefficients, the K coefficients being determined from the M coefficients based on priorities of the M coefficients, the reference signal resource being one of N reference signal resources, M and N being integers greater than 1, K being a positive integer less than or equal to M, the priorities of the M coefficients being determined based on priorities of the N reference signal resources, and the M coefficients being used to determine a precoding matrix; and A device having:

16. the processing unit is further configured to determine the precoding matrix based on the indication of the K coefficients included in the first information.

16. The apparatus of claim 15.

17. the priorities of the M coefficients are further determined based on one or more of a transmission layer sequence number, a spatial domain basis vector sequence number, a reference signal port sequence number, and a frequency domain basis vector sequence number; 17. Apparatus according to any one of claims 14 to 16.

18. The priority of a coefficient associated with a spatial domain basis vector or a reference signal port corresponding to any one of the N reference signal resources is determined as follows: n of the N reference signal resources １ The priority of the nth reference signal resource is ２ If the priority of the nth reference signal resource is higher than the priority of the nth reference signal resource, １ The priority of a coefficient associated with any spatial domain basis vector corresponding to the nth reference signal resource is ２ higher than the priority of the coefficient associated with any spatial domain basis vector corresponding to the nth reference signal resource, or １ The priority of a coefficient associated with any reference signal port corresponding to the nth reference signal resource is ２ higher than the priority of the coefficient associated with any reference signal port corresponding to the th reference signal resource, or n of the N reference signal resources １ The priority of the nth reference signal resource is ２ If the priority of the nth reference signal resource is higher than the priority of the nth reference signal resource, １ The priority of the coefficient associated with the i-th spatial domain basis vector corresponding to the i-th reference signal resource is determined by the n ２ higher than the priority of the coefficient associated with the i-th spatial domain basis vector corresponding to the n-th reference signal resource, or １ The priority of the coefficient associated with the i-th reference signal port corresponding to the i-th reference signal resource is determined by the n ２ higher than the priority of a coefficient associated with the i-th reference signal port corresponding to the i-th reference signal resource, where i represents a sequence number of the spatial domain basis vector or the reference signal port. The first predetermined rule is determined according to any one or more items of the first predetermined rule:

18. Apparatus according to any one of claims 14 to 17.

19. The priorities of the M coefficients are [Equation 10] where l represents the transmission layer sequence number, l is set to 1, 2, ..., v, v represents the number of transmission layers, i represents the spatial domain basis vector sequence number, i is set to 0, 1, ..., 2L ｎ Set to -1, L ｎ represents the number of spatial domain basis vectors corresponding to the nth reference signal resource, f represents the frequency domain basis vector sequence number, and f is 0, 1, ..., M ｖ -1, M ｖ represents the number of frequency domain basis vectors, n represents the sequence number of the N reference signal resources, φ(i,n) represents the priority of the coefficient set associated with the i-th spatial domain basis vector corresponding to the n-th reference signal resource, and φ(i,n)<2L ｍａｘ Satisfies X, where X is an integer equal to or greater than N, and L ｍａｘ is greater than or equal to the maximum number of spatial domain basis vectors corresponding to the N reference signal resources, respectively; π(f) represents a first remapping function used to remap sequence numbers or indices of frequency domain basis vectors selected for the l-th transmission layer and the n-th reference signal resource; and Pri(l,i,f,n) represents a priority of a coefficient corresponding to a given combination of the l-th transmission layer, the n-th reference signal resource, the i-th spatial domain basis vector, and the f-th frequency domain basis vector.

19. Apparatus according to any one of claims 14 to 18.

20. φ(i, n) is [0011] where G(n) represents the priority of the n-th reference signal resource among the N reference signal resources, and L ｍａｘ is equal to or greater than the maximum number of spatial domain basis vectors corresponding to the N reference signal resources, respectively, and i represents the spatial domain basis vector sequence number, where i is 0, 1, ..., 2L. ｎ Set to -1, L ｎ represents the number of spatial domain basis vectors corresponding to the n-th reference signal resource, [0012] where G(n) represents the priority of the n-th reference signal resource among the N reference signal resources, i represents the spatial domain basis vector sequence number, and i is 0, 1, ..., 2L ｎ Set to -1, L ｎ represents the number of spatial domain basis vectors corresponding to the n-th reference signal resource, and φ ｎ (i) = i or φ ｎ (i) = i + 2L ｍａｘ -2L ｎ and φ ｎ (i) represents a second remapping function, used to remap the spatial domain basis vector sequence numbers; or [0013] is the formula, and a ｎ is a positive integer of 1 or more, and L ｎ is directly proportional to the value of ｎ The greatest common divisor of is 1, and i represents the spatial domain basis vector sequence number, where i is 0, 1, . . . , 2L. ｎ Set to -1, L ｎ represents the number of spatial domain basis vectors corresponding to the n-th reference signal resource, and a ｍａｘ is all a ｎ The maximum value of Satisfy one of the following:

20. The apparatus of claim 19.

21. n of the N reference signal resources １ The priority of the nth reference signal resource is ２ If the priority of the reference signal resource is higher than the priority of the n １ The priority of any coefficient associated with the nth reference signal resource is ２ higher than the priority of any coefficient associated with the th reference signal resource, 18. Apparatus according to any one of claims 14 to 17.

22. The priorities of the M coefficients are [0014] where l represents the transmission layer sequence number, l is set to 1, 2, ..., v, v represents the number of transmission layers, i represents the spatial domain basis vector sequence number, i is set to 0, 1, ..., 2L ｎ Set to -1, L ｎ represents the number of spatial domain basis vectors corresponding to the nth reference signal resource, f represents the frequency domain basis vector sequence number, and f is 0, 1, ..., M ｖ -1, M ｖ represents the number of frequency domain basis vectors, n represents the sequence number of the N reference signal resources, G(n) represents the priority of the n-th reference signal resource among the N reference signal resources, and L ｍａｘ is equal to or greater than the maximum number of spatial domain basis vectors corresponding to the N reference signal resources, respectively, and Y is M ｖ or Y is an integer equal to or greater than N ３ is an integer equal to or greater than N ３ where π(f) represents the number of subbands or frequency domain units, π(f) represents a first remapping function used to remap sequence numbers or indices of frequency domain basis vectors selected for the l-th transmission layer and the n-th reference signal resource, and Pri(l,i,f,n) represents the priority of a coefficient corresponding to a given combination of the l-th transmission layer, the n-th reference signal resource, the i-th spatial domain basis vector, and the f-th frequency domain basis vector.

22. Apparatus according to any one of claims 14 to 17 and 21.

23. π(f) is The formula π(f) = f, [Equation 15] This is the formula, [0016] and k ３，ｌ，ｎ （ｆ） represents the index of the f-th frequency domain basis vector of the n-th reference signal resource corresponding to the l-th transmission layer in the universal set of frequency domain basis vectors; k ３，ｌ，ｎ （ｆｌ＊） represents the original index of the frequency domain basis vector corresponding to the strongest coefficient among the N reference signal resources corresponding to the l-th transmission layer, and f ｌ ＊ represents the sequence number of the frequency domain basis vector corresponding to the strongest coefficient of the l-th transmission layer, and n ＊ represents the reference signal resource sequence number corresponding to the strongest coefficient of the l-th transmission layer, or [Equation 17] This is the formula, [Equation 18] and k ３，ｌ，ｎ （ｆ） represents the index of the f-th frequency domain basis vector of the n-th reference signal resource corresponding to the l-th transmission layer in the universal set of frequency domain basis vectors; k ３，ｌ，ｎ （ｆｌ，ｎ＊） represents the original index of the frequency domain basis vector corresponding to the strongest coefficient of the n-th reference signal resource corresponding to the l-th transmission layer, and f ｌ，ｎ ＊ represents the sequence number of the frequency domain basis vector corresponding to the strongest coefficient of the n-th reference signal resource corresponding to the l-th transmission layer, Satisfy one of the following:

23. Apparatus according to any one of claims 19, 20 and 22.

24. The smaller the value of Pri(l, i, f, n), the higher the priority of a coefficient corresponding to a given sequence number combination of the l transmission layer, the n reference signal resource, the i spatial domain basis vector or reference signal port, and the f frequency domain basis vector.

24. Apparatus according to any one of claims 19 to 23.

25. The priorities of the N reference signal resources are A reference signal resource corresponding to a larger number of spatial domain basis vectors or a reference signal resource from which a larger number of reference signal ports are selected has a higher priority. The reference signal resource corresponding to the larger amplitude of the strongest coefficient has a higher priority. A reference signal resource corresponding to a higher signal strength of the reference signal has a higher priority, or A reference signal resource corresponding to a lower sequence number of the reference signal resource has a higher priority. The second predetermined rule is determined according to any one or more of the following:

25. Apparatus according to any one of claims 14 to 24.

26. The smaller the value of G(n), the higher the priority of the n-th reference signal resource.

23. Apparatus according to claim 20 or 22.

27. a processor and an interface circuit; the interface circuitry is configured to receive signals from other communication devices and transmit the signals to the processor or transmit signals from the processor to other communication devices; The processor is configured to implement the method of any one of claims 1 to 13 by using logic circuits or by executing code instructions. Communication equipment.

28. storing computer programs or instructions; The computer program or the instructions, when executed by a communication device, perform the method of any one of claims 1 to 13. A readable storage medium.

29. A computer program comprising instructions, The computer program, when executed by a communication device, performs the method of any one of claims 1 to 13. Computer program.

30. A chip system including a processor configured to support a device implementing functionality related to the method of any one of claims 1 to 13.

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