RU2845269C2 - Methods and apparatus, as well as communication device and data medium for determining precoding based on codebook - Google Patents

Abstract

FIELD: mobile communication.

SUBSTANCE: according to a method for determining pre-coding based on a codebook, in accordance with certain channel information corresponding to each channel state information (CSI)-RS resource and information on parameters of the codebook, terminal sends CSI information to a network device. CSI includes indication information corresponding to a plurality of CSI-RS resources and indication information corresponding to each CSI-RS resource, or indicating information corresponding to a plurality of port groups in one CSI-RS, and indicating information corresponding to each port group. CSI is used to precode the terminal based on the structure of the codebook corresponding to the parameter information of the codebook.

EFFECT: reduced overhead costs for feedback, high accuracy of preliminary coding of terminal.

15 cl, 12 dwg

Description

Field of technology to which the present disclosure pertains

[0001] The present disclosure relates to the field of mobile communication technology and, more particularly, to a method and apparatus, as well as a communication device and a data carrier, for determining pre-coding based on a codebook.

Prior art of the present disclosure

[0002] In a mobile communication system, a network device and a terminal can exchange data with each other. The terminal can transmit channel status information (CSI) back to the network device, and the network device determines precoding of the terminal according to the received CSI and the corresponding codebook structure. However, when a plurality of network devices, in particular a plurality of transmission reception points (TRPs), jointly serve one terminal, it is necessary to determine the precoding used by the plurality of TRPs to transmit data to the terminal. At this point, a problem arises that needs to be immediately solved, namely, how exactly the network device determines precoding for joint operation of the plurality of TRPs based on the codebook.

Brief Description of the Present Disclosure

[0003] The present disclosure provides a method and device, as well as a communication device and a storage medium for determining precoding based on a codebook. The present disclosure jointly uses a plurality of pieces of channel information of transmit/receive points (TRPs) and provides a method for reporting channel state information (CSI), which not only reduces the overhead of reverse data transmission, but also improves the accuracy of determining precoding of a terminal. The technical solution is as follows:

[0004] According to one aspect of the present disclosure, a method for determining precoding based on a codebook, performed by a terminal, is provided. The method includes the following steps: determining, based on at least one resource (CSI-RS) of a reference signal of channel state information, channel information corresponding to each CSI-RS resource; and transmitting, according to the channel information determined according to each CSI-RS resource and the codebook parameter information, the CSI information to a network device, wherein the CSI includes indicator information corresponding to a plurality of CSI-RS resources and indicator information corresponding to each CSI-RS resource, or the CSI includes indicator information corresponding to a plurality of port groups in one CSI-RS resource and indicator information corresponding to each port group, the port group includes a plurality of CSI-RS ports corresponding to the CSI-RS resource; and the CSI is configured to determine the pre-coding of the terminal based on the codebook structure corresponding to the codebook parameter information.

[0005] According to one aspect of the present disclosure, a method for determining precoding based on a codebook is provided, performed by a network device. The method includes the following steps: receiving CSI from a terminal, wherein the CSI includes indicator information corresponding to a plurality of CSI-RS resources and indicator information corresponding to each CSI-RS resource, or the CSI includes indicator information corresponding to a plurality of port groups in one CSI-RS resource and indicator information corresponding to each port group, the port group includes a plurality of CSI-RS ports corresponding to the CSI-RS resource, and the CSI is determined by the terminal based on channel information corresponding to each CSI-RS resource in at least one CSI-RS resource and codebook parameter information; determining precoding of the terminal according to the CSI and the codebook structure corresponding to the codebook parameter information.

[0006] According to one aspect of the present disclosure, a device for determining precoding based on a codebook is proposed. The device includes a determining module and a transmitting module. The determining module is configured to determine, based on at least one CSI-RS resource, channel information corresponding to each CSI-RS resource. The transmitting module is configured to transmit, according to the channel information determined according to each CSI-RS resource and the codebook parameter information, the CSI information to a network device, wherein the CSI includes indicator information corresponding to a plurality of CSI-RS resources and indicator information corresponding to each CSI-RS resource, or the CSI includes indicator information corresponding to a plurality of port groups in one CSI-RS resource and indicator information corresponding to each port group, the port group includes a plurality of CSI-RS ports corresponding to the CSI-RS resource; and the CSI is configured to determine the pre-coding of the terminal based on the codebook structure corresponding to the codebook parameter information.

[0007] According to one aspect of the present disclosure, a device for determining precoding based on a codebook is provided. The device includes a receiving module and a determining module. The receiving module is configured to receive CSI from a terminal, wherein the CSI includes indicator information corresponding to a plurality of CSI-RS resources and indicator information corresponding to each CSI-RS resource, or the CSI includes indicator information corresponding to a plurality of port groups in one CSI-RS resource and indicator information corresponding to each port group, the port group includes a plurality of CSI-RS ports corresponding to the CSI-RS resource, and the CSI is determined by the terminal based on channel information corresponding to each CSI-RS resource in at least one CSI-RS resource and codebook parameter information. The determining module is configured to determine precoding of the terminal according to the CSI and a codebook structure corresponding to the codebook parameter information.

[0008] According to one aspect of the present disclosure, a terminal is provided, including a processor, a transceiver connected to the processor, and a memory for storing instructions executable by the processor. The processor is configured to load and execute the executable instructions for implementing a method for determining precoding based on a codebook according to the above-described aspect.

[0009] According to one aspect of the present disclosure, a device is proposed that includes a processor, a transceiver connected to the processor, and a memory for storing instructions executable by the processor. The processor is configured to load and execute the executable instructions for implementing a method for determining pre-coding based on a codebook according to the above-described aspect.

[0010] According to one aspect of the present disclosure, a machine-readable storage medium is provided, on which executable program codes are stored. When the executable program codes are loaded into a processor and executed by it, a method for determining pre-coding based on a codebook according to the above-described aspect is implemented.

[0011] According to one aspect of the present disclosure, a microcircuit is provided that includes a logic circuit and/or program instructions. When the microcircuit operates on a terminal, a method for determining pre-coding based on a codebook according to the above-described aspect is implemented.

[0012] According to one aspect of the present disclosure, a product in the form of a computer program is provided. When the product in the form of a computer program is executed by a processor of a terminal, a method for determining pre-coding based on a codebook according to the above-described aspect is implemented.

[0013] According to a solution to the problem of determining precoding based on a codebook according to the embodiments of the present disclosure, after the terminal measures the CSI-RS corresponding to each CSI-RS resource, the indication information reported to the network device indicates codebook parameter information corresponding to a plurality of CSI-RS resources and codebook parameter information corresponding to each CSI-RS resource, or indicates codebook parameter information corresponding to a plurality of port groups in one CSI-RS resource and codebook parameter information corresponding to each port group. The plurality of CSI-RS resources or the plurality of port groups can be understood as corresponding to a plurality of TRPs. That is, according to the disclosure, parameters shared by a plurality of TRPs and individual parameters for each TRP are determined, so that the network device can determine precoding of the terminal according to the parameters reported by the terminal. According to the present disclosure, channel information of a plurality of TRPs is shared and a method for reporting CSI information is proposed, which not only reduces the overhead of reverse data transmission but also improves the accuracy of determining the precoding of a terminal.

Brief description of the figures

[0014] In order to provide a more understandable description of the technical solutions according to the embodiments of the present disclosure, a brief description of the figures used to explain the embodiments of the present disclosure is given below. It is obvious that the figures in the following descriptions refer only to some embodiments of the present disclosure, and based on these figures, other figures can be obtained by those skilled in the art without any creative efforts.

[0015] Fig. 1 shows a block diagram of a communication system according to an illustrative embodiment of the present disclosure.

[0016] Fig. 2 shows a block diagram of another communication system according to an illustrative embodiment of the present disclosure.

[0017] Fig. 3 shows a flow chart of a method for determining pre-coding based on a codebook according to an explanatory (illustrative) embodiment of the present disclosure.

[0018] Fig. 4 shows a flow chart of a method for determining pre-coding based on a codebook according to an explanatory (illustrative) embodiment of the present disclosure.

[0019] Fig. 5 shows a flow chart of a method for determining pre-coding based on a codebook according to an explanatory (illustrative) embodiment of the present disclosure.

[0020] Fig. 6 shows a flow chart of a method for determining pre-coding based on a codebook according to an explanatory (illustrative) embodiment of the present disclosure.

[0021] Fig. 7 shows a flow chart of a method for determining pre-coding based on a codebook according to an explanatory (illustrative) embodiment of the present disclosure.

[0022] Fig. 8 shows a block diagram of an apparatus for determining pre-coding based on a codebook according to an illustrative embodiment of the present disclosure.

[0023] Fig. 9 is a block diagram of another device for determining pre-coding based on a codebook according to an illustrative embodiment of the present disclosure.

[0024] Fig. 10 is a block diagram of an apparatus for determining pre-coding based on a codebook according to an illustrative embodiment of the present disclosure.

[0025] Fig. 11 is a block diagram of another device for determining pre-coding based on a codebook according to an illustrative embodiment of the present disclosure.

[0026] Fig. 12 shows a block diagram of a data transmission device system according to an illustrative embodiment of the present disclosure.

Detailed Description of the Present Disclosure

[0027] To more clearly explain the objectives, technical solutions and advantages of the present disclosure, specific embodiments of the present disclosure are described in detail below with reference to the accompanying figures.

[0028] Detailed information is provided below regarding exemplary (illustrative) embodiments, examples of which are shown in the accompanying figures. In the following description, reference is made to the accompanying figures, wherein like numerals in different figures represent the same or similar elements, unless otherwise indicated. The implementations set forth in the following descriptions of illustrative (illustrative) embodiments do not represent all possible embodiments consistent with the present disclosure. Instead, they are merely examples of devices and methods consistent with certain aspects of the present disclosure, as set forth in the appended claims.

[0029] The terms used in the embodiments of the present disclosure are used only to describe particular embodiments and are not intended to limit the embodiments of the present disclosure. The singular and the expressions "the present/the above" as used in the description of the disclosure and in the appended claims are also intended to include the plural, except where the context clearly indicates other meanings. It should also be understood that the term "and/or" as used in the present disclosure includes any and all possible combinations of one or more associated listed items.

[0030] It should be understood that although the terms "first," "second," and "third" may be used in embodiments in the present disclosure to describe various pieces of information, these pieces of information will not be limited to such terms. Such terms are used merely to distinguish similar pieces of information from one another. For example, without departing from the spirit and scope of the present disclosure, a first piece of information may also be referred to as a second piece of information, and similarly, a second piece of information may also be referred to as a first piece of information. Depending on the context, the term "if" as used herein may be interpreted as "when," "until," and "after determination."

[0031] It should be noted that the information (including but not limited to the user's device information, the user's personal information, etc.), data (including but not limited to the data used for analysis, stored data, displayed data, etc.) and signals used in this disclosure are all authorized by the users or fully authorized by all parties, and the collection, use and processing of the relevant data shall comply with the relevant laws, regulations and standards of the relevant countries and regions.

[0032] The following is an explanation of application scenarios of the present disclosure.

[0033] Fig. 1 shows a block diagram of a communication system according to an illustrative embodiment of the present disclosure. The communication system may include a terminal 10 and a network device 20.

[0034] Typically, there are a plurality of terminals 10, and one or more terminals 10 may be located in a cell controlled by each network device 20. The terminal 10 may include various portable devices with wireless communication functions, devices installed on vehicles, wearable devices, computing devices or other processing devices connected to a wireless modem, as well as various types of user equipment (UE), mobile stations (MS), etc. For convenience of description, the above-mentioned devices in the embodiments of the present disclosure are collectively referred to as terminals.

[0035] The network device 20 is a device deployed in an access network to provide a wireless communication function for the terminal 10. For convenience of description, the above-mentioned devices in the embodiments of the present disclosure that provide a wireless communication function for the terminal 10 are collectively referred to as network devices. A connection can be established between the network device 20 and the terminal 10 via a radio interface, so that communication is performed by means of a connection including signaling and data interaction. There may be several network devices 20, and two neighboring network devices 20 can exchange data with each other via wired or wireless means. The terminal 10 can switch between different network devices 20, that is, establish connections with different network devices 20.

[0036] The network device 20 may include various types of macro base stations, micro base stations, relay stations, access points, transceiver points (TRPs), etc. In systems using different radio access technologies, the names of devices with the functions of network devices may be different. For example, in New Radio (NR) systems in 5G networks, they are called gNodeB or gNB. The name "network device" may change depending on the development of communication technology.

[0037] According to some embodiments, the network device may include one or more TRPs, or the network device may include one or more antenna panels.

[0038] If the network device includes a plurality of TRPs, the network device can exchange data with the terminal through each TRP of the plurality of TRPs. That is, the network device establishes a transmission channel with each TRP of the plurality of TRPs, and then exchanges data with the terminal based on the established transmission channel.

[0039] If the network device includes a plurality of antenna panels, the network device can exchange data with the terminal through each of the plurality of antenna panels. That is, the network device establishes a transmission channel with each of the plurality of antenna panels, and then exchanges data with the terminal based on the established transmission channel.

[0040] For example, as shown in Fig. 2, the network device is configured to exchange data with four TRPs, namely, TRP1, TRP2, TRP3, and TRP4. The network device establishes connections with the terminal through the four TRPs, and then the network device can exchange data with the terminal through the four TRPs.

[0041] According to some embodiments, a plurality of TRPs included in a network device may work together with each other using coherent joint transmission (CJT) technology to perform data transmission between the network device and the terminal. CJT technology means that each data stream will be associated with a TRP participating in the joint work using a vector of weights.

[0042] Fig. 3 shows a flow chart of a method for determining pre-coding based on a codebook according to an illustrative embodiment of the present disclosure, which can be illustratively applied to the terminal and network device shown in Fig. 1, and the method includes at least part of the following content.

[0043] In step 301, the terminal determines channel information corresponding to each CSI-RS resource based on at least one CSI-RS resource.

[0044] CSI-RS resources are used to transmit CSI-RS. In addition, a CSI-RS resource is configured by a network device, and then the network device can transmit CSI-RS to a terminal using the configured CSI-RS resources.

[0045] According to embodiments of the present disclosure, a terminal measures a CSI-RS based on at least one CSI-RS resource to obtain measured channel information corresponding to each CSI-RS resource.

[0046] According to some embodiments, the CSI-RS resource is a Channel Measurement Resource (CMR). That is, according to some embodiments, the CSI-RS resource is a CMR resource.

[0047] In some cases, different CMRs belong to the same CSI-RS resource set or different CMRs belong to different CSI-RS resource sets.

[0048] According to some embodiments, each CSI-RS resource in at least one CSI-RS resource corresponds to one TRP, and at least two TRPs are used for the CJT transmission technology.

[0049] According to some other embodiments, each group of the plurality of port groups in one CSI-RS resource corresponds to one TRP, and at least two TRPs are used for the CJT.

[0050] One CSI-RS resource corresponds to a plurality of CSI-RS ports, the plurality of CSI-RS ports are grouped to obtain a plurality of port groups, each port group includes at least one CSI-RS port, and each port group corresponds to one TRP.

[0051] In step 302, the terminal transmits CSI to the network device according to the channel information determined according to each CSI-RS resource and the codebook parameter information. The CSI information includes indicator information corresponding to a plurality of CSI-RS resources and indicator information corresponding to each CSI-RS resource, or the CSI includes indicator information corresponding to a plurality of port groups in one CSI-RS resource and indicator information corresponding to each port group, the port group includes a plurality of CSI-RS ports corresponding to the CSI-RS resource. The CSI information is configured to determine precoding of the terminal based on the codebook structure corresponding to the codebook parameter information.

[0052] The codebook parameter information is used by the terminal to report indication information so that the network device can determine the precoding of the terminal. In addition, the codebook parameter information corresponds to the codebook structure, which means that the precoding of the terminal can be determined according to the codebook structure corresponding to the codebook parameter information and the CSI. In addition, the CSI according to embodiments of the disclosure is configured to determine the precoding of the terminal based on the codebook structure corresponding to the codebook parameter information, and the CSI includes indication information. That is, the indication information included in the CSI is configured to determine the precoding of the terminal based on the codebook structure corresponding to the codebook parameter information.

[0053] The CSI information includes indication information corresponding to a plurality of CSI-RS resources and indication information corresponding to each CSI-RS resource. The indication information corresponding to a plurality of CSI-RS resources means that the indication information included in the CSI for determining the precoding of the terminal can be applied to each CSI-RS resource. That is, the transmission of the indication information can be applied to each CSI-RS resource. The indication information corresponding to each CSI-RS resource means that the precoding parameters for the terminal included in the CSI are applied to one CSI-RS resource. That is, the indication information corresponding to each CSI-RS resource is applied to the corresponding CSI-RS resource, but is not applied to other CSI-RS resources.

[0054] According to an alternative embodiment, the CSI includes indication information corresponding to a plurality of port groups in one CSI-RS resource and indication information corresponding to each port group, and the port group includes a plurality of CSI-RS ports corresponding to the CSI-RS resource. The indication information corresponding to a plurality of port groups means that the indication information included in the CSI for determining the terminal precoding can be applied to each port group. That is, transmission of the indication information can be applied to each port group. The indication information corresponding to each port group means that the indication information included in the CSI for determining the terminal precoding is applied to one port group. That is, the parameters corresponding to each port group are applied to the corresponding port group, but are not applied to other port groups.

[0055] According to embodiments of the present disclosure, after the terminal determines channel information corresponding to each CSI-RS resource in at least one CSI-RS resource, indicator information that the terminal should report to the network device is determined in accordance with the received channel information and codebook parameter information. Then, the terminal sends the CSI, including the indicator information, to the network device, and the CSI is configured to determine precoding parameters of the terminal.

[0056] If at least one CSI-RS resource includes a plurality of CSI-RS resources, the terminal determines channel information corresponding to each CSI-RS resource. If at least one CSI-RS resource includes one CSI-RS resource, and the CSI-RS resource corresponds to a plurality of CSI-RS ports, the terminal determines channel information corresponding to each of the plurality of port groups.

[0057] According to some embodiments, the network device configures the codebook parameter information for the terminal using radio resource control (RRC) signaling, or the network device configures the codebook parameter information for the terminal using other signaling.

[0058] In step 303, the network device receives CSI information from the terminal. The CSI includes indicator information corresponding to a plurality of CSI-RS resources and indicator information corresponding to each CSI-RS resource, or the CSI includes indicator information corresponding to a plurality of port groups in one CSI-RS resource and indicator information corresponding to each port group. The port group includes a plurality of CSI-RS ports corresponding to the CSI-RS resource, and the CSI is determined by the terminal based on channel information corresponding to each CSI-RS resource in at least one CSI-RS resource and codebook parameter information.

[0059] At step 304, the network device determines a pre-coding of the terminal according to the CSI and a codebook structure corresponding to the codebook parameter information.

[0060] The parameter information of the codebook corresponds to the structure of the codebook. If the structure of the codebook is different, the network device determines the pre-coding of the terminal based on the structure of the codebook in various ways.

[0061] According to one embodiment of the present disclosure, after a network device receives a CSI, the network device may determine, according to the CSI, indicator information corresponding to a plurality of CSI-RS resources and indicator information corresponding to each CSI-RS resource included in the CSI, or indicator information corresponding to a plurality of port groups in one CSI-RS resource and indicator information corresponding to each port group indicated in the CSI, and then determine a precoding of the terminal according to the determined CSI and a codebook structure corresponding to the codebook parameter information.

[0062] It should be noted that the steps performed by the network device may form an independent embodiment, and the steps performed by the terminal may also form an independent embodiment, this is not limited in any way in the present disclosure.

[0063] According to a solution according to an embodiment of the present disclosure, after the terminal measures the CSI-RS corresponding to each CSI-RS resource, the CSI reported to the network device includes indication information corresponding to a plurality of CSI-RS resources and indication information corresponding to each CSI-RS resource, or indication information corresponding to a plurality of port groups in one CSI-RS resource and indication information corresponding to each port group. The plurality of CSI-RS resources or the plurality of port groups can be understood as corresponding to a plurality of TRPs. That is, according to the disclosure, parameters shared by a plurality of TRPs and individual parameters for each TRP are determined, so that the network device can determine the precoding of the terminal according to the parameters reported by the terminal. According to the present disclosure, channel information of a plurality of TRPs is shared and a method is proposed for reporting channel CSI information, which not only reduces the overhead of reverse data transmission but also improves the accuracy of determining the precoding of the terminal.

[0064] According to the embodiment shown in Fig. 3, the CSI sent by the terminal includes information elements, and the included information elements include various situations.

[0065] The first CSI information element includes at least one of the following information items (1)-(3).

[0066] (1) N pieces of spatial domain (SD) basis vector indicator information or N pieces of port selection indicator information, where N is the same as the number of CSI-RS resources and N is a positive integer greater than 1.

[0067] The SD basis vector indicator information is represented by the SD basis vector. The SD basis vector indicator information indicates the SD basis vectors selected by the terminal, where i belongs to the set {1,2...,N}. According to some embodiments, the SD basis vector indicator information is an SD beam basis vector, which may be called a beam basis vector, or an SD basis vector, or a beam. The port selection indicator information indicates the CSI-RS ports selected by the terminal.

[0068] In addition, the CSI information sent by the terminal to the network device includes N pieces of SD basic vector indication information or N pieces of port selection indication information, which actually correspond to the number of CSI-RS resources. This can also be understood as a one-to-one correspondence between the pieces of SD basic vector indication information or the pieces of port selection indication information and the CSI-RS resources. In addition, each CSI-RS resource corresponds to one TRP, that is, N CSI-RS resources correspond to N TRPs, and the terminal reports a piece of SD basic vector indication information or a piece of port selection indication information corresponding to each TRP.

[0069] For example, the SD basis vector indicator information is used below for explanation. The SD basis vector indicated by the SD basis vector indicator information is denoted as Where or is a matrix consisting of SD basis vectors corresponding to the i-th CSI-RS resource, N denotes the number of CSI-RS resources, N _t denotes the number of transmit antenna ports, L _i denotes the number of SD basis vectors or the number of CSI-RS ports corresponding to the i-th CSI-RS resource, i ∈ {1, …, N}, and P is the number of CSI-RS ports. is a complex matrix with dimensions X rows and Y columns, for example, X is N _t , and Y is that is, The complex matrix according to the following embodiments is similar in an embodiment of the present invention, which is not repeated further herein.

[0070] In some cases, if the number of CSI-RS resources is 2, the number of SD basis vectors corresponding to each CSI-RS resource is 4, and L _i is 4, then

[0071] It should be noted that, as an example, an embodiment of the present disclosure is described using N pieces of SD basic vector indicator information or N pieces of port selection indicator information corresponding to CSI-RS resources. According to another embodiment, N pieces of SD basic vector indicator information or N pieces of port selection indicator information may also correspond to a plurality of port groups in one CSI-RS resource.

[0072] The CSI information includes N pieces of indication information of the SD basis vector or N pieces of indication information for selecting a port, and N is the same as the number of port groups, and N is a positive integer that is greater than 1.

[0073] The CSI information sent by the terminal to the network device includes N pieces of SD basic vector indication information or N pieces of port selection indication information, which actually correspond to the number of port groups. This can also be understood as a one-to-one correspondence between the pieces of SD basic vector indication information or the pieces of port selection indication information and the port groups. In addition, each port group corresponds to one TRP, that is, N port groups correspond to N TRPs, and the terminal reports a piece of SD basic vector indication information or a piece of port selection indication information corresponding to each TRP.

[0074] For example, the SD basis vector indicator information is used below for explanation. The SD basis vector indicated by the SD basis vector indicator information is denoted as , or is a matrix consisting of L _i SD basis vectors corresponding to the i-th port group, N _t denotes the number of at least two port groups, denotes the number of transmit antenna ports, L _i denotes the number of SD basis vectors or the number of CSI-RS ports corresponding to the i-th port group, i ∈ {1, …, N}, and P is the number of CSI-RS ports.

[0075] In some cases, if the number of port groups is 2, the number of SD basis vectors corresponding to each port group is 4, and L _i is 4, then

[0076] (2) combination coefficient indicator information, and the combination coefficient indicator information corresponds to a plurality of CSI-RS resources.

[0077] According to one embodiment of the present disclosure, the CSI information sent by the terminal to the network device includes combination coefficient indicator information that is actually shared by a plurality of CSI-RS resources. This can also be understood as combination coefficient indicator information corresponding to a plurality of CSI-RS resources. In addition, each CSI-RS resource corresponds to one TRP, that is, N CSI-RS resources correspond to N TRPs, and the terminal reports combination coefficient indicator information shared by the plurality of TRPs.

[0078] For example, the combination coefficient matrix indicated by the combination coefficient indicator information is denoted as , and N denotes the number of CSI-RS resources, denotes the number of parts of the SD basis vector pointer information or the number of CSI-RS ports corresponding to the i-th CSI-RS resource, and M denotes the number of frequency domain (FD) basis vectors corresponding to the CSI-RS resource.

[0079] In some cases, if the number of CSI-RS resources is 2, the number of SD basis vectors corresponding to each CSI-RS resource is 4, L _i is 4, and the number of FD basis vectors corresponding to at least two CSI-RS resources is 4, then M is 4, and

[0080] It should be noted that, as an example, an embodiment of the present disclosure is described using indicator information corresponding to one CSI-RS resource. According to another embodiment, the indicator information of the combination coefficients may also correspond to a plurality of port groups in one CSI-RS resource.

[0081] The CSI information includes combination coefficient indicator information, and the combination coefficient indicator information corresponds to a plurality of port groups.

[0082] According to one embodiment of the present disclosure, the CSI information sent by the terminal to the network device includes combination coefficient indicator information that is actually shared by a plurality of port groups. It can also be understood as combination coefficient indicator information corresponding to a plurality of port groups. In addition, each port group corresponds to one TRP, that is, N port groups correspond to N TRPs, and the terminal reports combination coefficient indicator information shared by the plurality of TRPs.

[0083] For example, the combination coefficient matrix indicated by the combination coefficient indicator information is denoted as , and N denotes the number of port groups, denotes the number of SD basis vectors or the number of CSI-RS ports corresponding to the i-th port group, and M denotes the number of FD basis vectors corresponding to a port group.

[0084] In some cases, if the number of port groups is 2, the number of basis vectors SD corresponding to each port group is 4, L _i is 4, and the number of basis vectors FD corresponding to at least two port groups is 4, then M is 4, and

[0085] (3) The FD basis vector indicator information, and the FD basis vector indicator information corresponds to a plurality of CSI-RS resources.

[0086] The FD basis vector indicator information indicates M FD basis vectors selected by the terminal. The FD basis vector indicator information is used to represent a channel change rule in the FD. In particular, the FD basis vectors can be used to represent a rule for changing the weight of each SD basis vector in each FD block. The change rule represented by the FD basis is related to factors such as multipath delay.

[0087] According to one embodiment of the present disclosure, the CSI information sent by the terminal to the network device includes FD basis vector indicator information that is actually shared by a plurality of CSI-RS resources. This can also be understood as FD basis vector indicator information corresponding to a plurality of CSI-RS resources. In addition, each CSI-RS resource corresponds to one TRP, that is, N CSI-RS resources correspond to N TRPs, and the terminal reports the FD basis vector indicator information shared by the plurality of TRPs.

[0088] For example, the FD basis vector indicated by the FD basis vector designation information is denoted as W f , it is a matrix of the FD basis vector, where N ₃ denotes the number of precoding matrix indication (PMI) sub-bands, and M denotes the number of FD basis vectors corresponding to CSI-RS resources.

[0089] In some cases, if the number of FD basis vectors corresponding to at least two CSI-RS resources is 4, then M is 4, and

[0090] It should be noted that, as an example, an embodiment of the present disclosure is described using the FD basic vector indicator information corresponding to one CSI-RS resource. According to another embodiment, the FD basic vector indicator information may also correspond to a plurality of port groups in one CSI-RS resource.

[0091] The CSI information includes FD basis vector indicator information, and the FD basis vector indicator information corresponds to a plurality of port groups.

[0092] According to an embodiment of the present disclosure, the CSI information sent by the terminal to the network device includes FD basis vector indicator information that is actually shared by a plurality of port groups. It can also be understood as FD basis vector indicator information corresponding to a plurality of port groups. In addition, each port group corresponds to one TRP, that is, N port groups correspond to N TRPs, and the terminal reports FD basis vector indicator information shared by the plurality of TRPs.

[0093] For example, the FD basis vector specified in the FD basis vector designation information is denoted as W _f it is a matrix of the FD basis vector, N ₃ denotes the number of PMI sub-bands, and M denotes the number of FD basis vectors corresponding to a port group.

[0094] In some cases, if the number of basis vectors FD corresponding to at least two groups of ports is 4, then M is 4, and

[0095] It should be noted that the SD basis vector indicator information, the combination coefficient indicator information, and the FD basis vector indicator information indicated by the CSI information according to the embodiments of the present disclosure simultaneously correspond to CSI-RS resources or port groups.

[0096] In addition, it should be noted that, as an example, an embodiment of the present disclosure is described using specific information indicated by the CSI sent by the terminal to the network device. According to another embodiment, the network device needs to first configure the codebook parameter information for the terminal, and then the terminal sends the CSI information to the network device in accordance with the codebook parameter information.

[0097] The codebook parameter information configured by the network device for the terminal includes at least one of the following: a number of SD basis vectors corresponding to each CSI-RS resource, a number of FD basis vectors corresponding to the CSI-RS resource, a number of PMI subbands, or a number of transmit antenna ports. According to an alternative embodiment, the codebook parameter information configured by the network device for the terminal includes at least one of the following: a number of SD basis vectors corresponding to each port group, a number of FD basis vectors corresponding to the port group, a number of PMI subbands, or a number of transmit antenna ports.

[0098] According to some embodiments, after the network device configures codebook parameter information for the terminal, the terminal determines parameters specified by the CSI in accordance with the configured codebook parameter information, and then sends the CSI information to the network device.

[0099] It should be noted that in the first situation the structure of the code book is expressed by the following formulas:

[0100] here W denotes the codebook structure, N denotes the number of CSI-RS resources, N _t denotes the number of transmit antenna ports, P denotes the number of CSI-RS ports, L _i denotes the number of SD basis vectors or the number of CSI-RS ports corresponding to the i-th CSI-RS resource, M denotes the number of FD basis vectors corresponding to the i-th CSI-RS resource or the number of FD basis vectors corresponding to the i-th port group, N ₃ denotes the number of PMI sub-bands, W _1.i ; denotes a matrix consisting of L _i SD basis vectors or unit basis vectors for selecting the port corresponding to the i-th CSI-RS resource, denotes a matrix consisting of the index information of the combination coefficients, W _f denotes a matrix consisting of M basis vectors FD, and C ^X×Y denotes a complex matrix with dimensions X rows and Y columns.

[0101] According to an alternative embodiment, here W denotes the codebook structure, N denotes the number of port groups, N _t denotes the number of transmit antenna ports, P denotes the number of CSI-RS ports, L _i denotes the number of SD basis vectors or the number of CSI-RS ports corresponding to the i-th port group, , M denotes the number of FD basis vectors corresponding to the i-th port group, N ₃ denotes the number of PMI subranges, W _1.i ; denotes a matrix consisting of L _i SD basis vectors or unit basis vectors for selecting a port corresponding to the i-th port group, denotes a matrix consisting of the index information of the combination coefficients, W _f denotes a matrix consisting of M basis vectors FD, and C ^X×Y denotes a complex matrix with dimensions X rows and Y columns.

[0102] According to some embodiments, if W _f is absent, then M = 1. The terminal selects ports L ₁ = 2, L ₂ = 4, and L ₃ = 8, respectively, according to the estimated true information of each port and calculates, based on the selected ports, port combination coefficients of W ₂ ∈ C ^28×1 _. The network device determines a calculation formula for precoding the terminal

. The user equipment UE reports the indication information accordingly, and the information of each quantization coefficient in , so the network device uses them to calculate the terminal precoding.

[0103] In the second type of information, a plurality of CSI-RS resources are grouped to obtain G CSI-RS resource groups, and the CSI contains information corresponding to each of the G CSI-RS resource groups. The value of G coincides with the number of CSI-RS resource groups in the plurality of CSI-RS resources, the CSI-RS resource group includes at least one CSI-RS resource, and G is a positive integer that is greater than 1. According to an alternative embodiment, a plurality of port groups are grouped to obtain G first groups, and the CSI contains information corresponding to each of the G first groups. The value of G coincides with the number of first groups among the plurality of port groups, the first group includes at least one port group, and G is a positive integer that is greater than 1.

[0104] The CSI information comprises at least one of the following information elements:

[0105] (1) G pieces of designation information of the SD basis vector or G pieces of designation information for selecting a port (1)-(3).

[0106] The SD basis vector indicator information is represented by the SD basis vector. The SD basis vector indicator information indicates L _g SD basis vectors selected by the terminal, where L _g denotes the number of SD basis vectors corresponding to the g-th CSI-RS resource group, L _g represents the number and value of the SD basis vectors corresponding to each CSI-RS resource in the g-th CSI-RS resource group. According to an alternative embodiment, the port selection indicator information indicates L _g CSI-RS ports selected by the terminal, where L _g denotes the number of CSI-RS ports corresponding to the g-th first group, L _g represents the number and value of CSI-RS ports corresponding to each port group in the g-th first group.

[0107] In addition, the CSI information sent by the terminal to the network device includes G pieces of SD basic vector indication information or G pieces of port selection indication information, which actually correspond to the number G of CSI-RS resource groups. This can also be understood as a one-to-one correspondence between the pieces of SD basic vector indication information or the pieces of port selection indication information and the CSI-RS resource groups. In addition, each CSI-RS resource group includes at least one CSI-RS resource, and each CSI-RS resource corresponds to one TRP, that is, the terminal reports a piece of SD basic vector indication information or a piece of port selection indication information corresponding to a CSI-RS resource in each CSI-RS resource group.

[0108] For example, the basis vector SD is used for explanation below. The basis vector SD is denoted as W _1,g , where W _1.i ; denotes a matrix consisting of one or more SD basis vectors corresponding to the g-th CSI-RS resource group, N _g denotes the number of CSI-RS resources or the number of port groups in the g-th group, N _t denotes the number of transmit antenna ports, L _g denotes the number of SD basis vectors or the number of CSI-RS ports selected for the g-th group, and denotes a complex matrix with dimensions

[0109] In some cases, an embodiment of the present disclosure includes 4 CSI-RS resources, wherein CSI-RS resource 1 and CSI-RS resource 2 are the first group of CSI-RS resources, CSI-RS resource 3 and CSI-RS resource 4 are the second group of CSI-RS resources, and CSI-RS resource 1, CSI-RS resource 2, CSI-RS resource 3 and CSI-RS resource 4 correspond to points TRP1, TRP2, TRP3 and TRP4, respectively, which can also be understood in such a way that TRP1 and TRP2 are the first group of CSI-RS resources, TRP3 and TRP4 are the second group of CSI-RS resources. The number of basis vectors SD is L ₁ = L ₂ = 4, L ₃ = L ₄ = 3, then And we denote a complex matrix with dimensions And denotes a complex matrix with dimensions .

[0110] It should be noted that, as an example, an embodiment of the present disclosure is described using grouping of CSI-RS resources to obtain G groups of CSI-RS resources. According to another embodiment, the G first groups can be obtained by grouping a plurality of port groups into one CSI-RS resource.

[0111] In addition, the CSI information sent by the terminal to the network device contains G pieces of indication information of the SD basic vector or G pieces of indication information for selecting a port, which actually correspond to the number G of first groups. This can also be understood as a one-to-one correspondence between the pieces of indication information of the SD basic vector or the pieces of indication information for selecting a port and the first groups. In addition, each first group includes at least one port group, and each port group corresponds to one TRP, that is, the terminal reports a piece of indication information of the SD basic vector or a piece of indication information for selecting a port corresponding to a port group in each first group.

[0112] For example, the basis vector SD is used for explanation below. The basis vector SD is denoted as , Where . denotes the matrix consisting of the SD basis vectors corresponding to the g-th first group, N _g denotes the number of CSI-RS resources or the number of port groups in the g-th group, N _t denotes the number of transmit antenna ports, L _g denotes the number of SD basis vectors or the number of CSI-RS ports selected for the g-th group, and denotes a complex matrix with dimensions .

[0113] In some cases, an embodiment of the present disclosure includes 4 port groups, where port group 1 and port group 2 are the 1st first group, port group 3 and port group 4 are the 2nd first group, and port group 1, port group 2, port group 3 and port group 4 correspond to points TRP1, TRP2, TRP3 and TRP4, respectively, which can also be understood in such a way that points TRP1 and TRP2 are the 1st first group, points TRP3 and TRP4 are the 2nd first group. The number of basis vectors SD is L ₁ = L ₂ = 4, L ₃ = L ₄ = 3, then And denotes a complex matrix with dimensions denotes a complex matrix with dimensions

[0114] (2) G parts of the combination coefficient indicator information.

[0115] According to one embodiment of the present disclosure, the CSI information sent by the terminal to the network device includes G pieces of combination coefficient indicator information, which actually correspond to the number G of CSI-RS resource groups. This can also be understood as a one-to-one correspondence between the pieces of combination coefficient indicator information and the CSI-RS resource groups. In addition, each CSI-RS resource group includes at least one CSI-RS resource, and each CSI-RS resource corresponds to one TRP, that is, the terminal reports a piece of combination coefficient indicator information corresponding to the CSI-RS resource in each CSI-RS resource group.

[0116] For example, the indicator information of the combination coefficients is designated as it is a matrix of combination coefficients. N _g denotes the number of CSI-RS resources in the g-th group, L _g denotes the number of CSI-RS ports selected for the g-th group, M _g denotes the number of FD basis vectors selected for the g-th group, and denotes a complex matrix with dimensions 2L _g × M _g .

[0117] In some cases, an embodiment of the present disclosure includes 4 CSI-RS resources, wherein CSI-RS resource 1 and CSI-RS resource 2 are the first group of CSI-RS resources, CSI-RS resource 3 and CSI-RS resource 4 are the second group of CSI-RS resources, and CSI-RS resource 1, CSI-RS resource 2, CSI-RS resource 3 and CSI-RS resource 4 correspond to points TRP1, TRP2, TRP3 and TRP4, respectively, which can also be understood in such a way that TRP1 and TRP2 are the first group of CSI-RS resources, TRP3 and TRP4 are the second group of CSI-RS resources. The number of basis vectors SD is L ₁ = L ₂ = 4, L ₃ = L ₄ = 3. The number of basis vectors FD corresponding to one of the two groups is M ₁ = 4, the number of basis vectors FD corresponding to the other of the two groups is M ₂ = 7,

[0118] It should be noted that, as an example, an embodiment of the present disclosure is described using grouping of CSI-RS resources to obtain G groups of CSI-RS resources. According to another embodiment, the G first groups can be obtained by grouping a plurality of port groups into one CSI-RS resource.

[0119] According to one embodiment of the present disclosure, the CSI information sent by the terminal to the network device includes G pieces of combination coefficient indicator information, which actually correspond to the number G of first groups. This can also be understood as a one-to-one correspondence between the pieces of combination coefficient indicator information and the first groups. In addition, each first group includes at least one port group, and each port group corresponds to one TRP, that is, the terminal reports combination coefficient indicator information corresponding to a port group in each first group.

[0120] For example, the indicator information of the combination coefficients is designated as it is a matrix of combination coefficients. , N _g denotes the number of port groups in the g-th group, L _g denotes the number of CSI-RS ports selected for the g-th group, M _g denotes the number of FD basis vectors selected for the g-th group, and denotes a complex matrix with dimensions

[0121] In some cases, an embodiment of the present disclosure includes 4 port groups, where port group 1 and port group 2 are the 1st first group, port group 3 and port group 4 are the 2nd first group, and port group 1, port group 2, port group 3 and port group 4 correspond to points TRP1, TRP2, TRP3 and TRP4, respectively, which can also be understood in such a way that points TRP1 and TRP2 are the 1st first group, points TRP3 and TRP4 are the 2nd first group. The number of basis vectors SD is L ₁ = L ₂ = 4, L ₃ = L ₄ = 3. The number of basis vectors FD corresponding to one of the two groups is M ₁ = 4, the number of basis vectors FD corresponding to the other of the two groups is M ₂ = 7,

[0122] (3) G parts of the reference information of the basis vector FD.

[0123] According to one embodiment of the present disclosure, the CSI information sent by the terminal to the network device includes G pieces of FD reference vector information, which actually correspond to the number G of CSI-RS resource groups. This can also be understood as a one-to-one correspondence between the pieces of FD reference vector information and the CSI-RS resource groups. In addition, each CSI-RS resource group includes at least one CSI-RS resource, and each CSI-RS resource corresponds to one TRP, that is, the terminal reports the FD reference vector corresponding to the CSI-RS resource in each CSI-RS resource group.

[0124] For example, the basis vector FD is denoted as it is the matrix of the basis vector FD B N denotes the number of CSI-RS resources, M _g denotes the number of FD basis vectors selected for the g-th group, H denotes the Hermitian conjugation operation of the matrix, and denotes a complex matrix of dimensions N ₃ × M _g .

[0125] In some cases, an embodiment of the present disclosure includes 4 CSI-RS resources, wherein CSI-RS resource 1 and CSI-RS resource 2 are the first group of CSI-RS resources, CSI-RS resource 3 and CSI-RS resource 4 are the second group of CSI-RS resources, and CSI-RS resource 1, CSI-RS resource 2, CSI-RS resource 3 and CSI-RS resource 4 correspond to points TRP1, TRP2, TRP3 and TRP4, respectively, which can also be understood in such a way that TRP1 and TRP2 are the first group of CSI-RS resources, TRP3 and TRP4 are the second group of CSI-RS resources. The number of basis vectors SD is L ₁ = L ₂ = 4, L ₃ = L ₄ = 3. The number of basis vectors FD corresponding to one of the two groups is M ₁ = 4, the number of basis vectors FD corresponding to the other of the two groups is M ₂ = 7,

[0126] It should be noted that, as an example, an embodiment of the present disclosure is described using grouping of CSI-RS resources to obtain G groups of CSI-RS resources. According to another embodiment, the G first groups can be obtained by grouping a plurality of port groups into one CSI-RS resource.

[0127] According to an embodiment of the present disclosure, the CSI information sent by the terminal to the network device includes G FD basis vectors. G parts of the FD basis vector indication information actually correspond to the number G of first groups, which can also be understood as a one-to-one correspondence between the parts of the FD basis vector indication information and the first groups. In addition, each first group includes at least one port group, and each port group corresponds to one TRP, that is, the terminal reports the FD basis vector corresponding to the port group in each first group.

[0128] For example, the basis vector FD is denoted as it is the matrix of the basis vector FD. , H denotes the Hermitian conjugation operation of the matrix, N _g denotes the number of CSI-RS resources or the number of port groups in the g-th group, H denotes the Hermitian conjugation operation of the matrix, N ₃ denotes the number of PMI subbands, denotes the number of FD basis vectors selected for the g-th group, and denotes a complex matrix of dimensions N ₃ × M _g .

[0129] In some cases, an embodiment of the present disclosure includes 4 port groups, where port group 1 and port group 2 are the 1st first group, port group 3 and port group 4 are the 2nd first group, and port group 1, port group 2, port group 3 and port group 4 correspond to points TRP1, TRP2, TRP3 and TRP4, respectively, which can also be understood in such a way that points TRP1 and TRP2 are the 1st first group, points TRP3 and TRP4 are the 2nd first group. The number of basis vectors SD is L ₁ = L ₂ = 4, L ₃ = L ₄ = 3. The number of basis vectors FD corresponding to one of the two groups is M ₁ = 4, the number of basis vectors FD corresponding to the other of the two groups is M ₂ = 7, Here

[0130] It should be noted that the SD basis vector indicator information, the combination coefficient indicator information, and the FD basis vector indicator information indicated by the CSI information according to an embodiment of the present disclosure simultaneously correspond to a CSI-RS resource group or the first group in a port group.

[0131] It should also be noted that, as an example, an embodiment of the present disclosure is described using specific information indicated by the CSI information sent by the terminal to the network device. According to another embodiment, the network device needs to first configure the codebook parameter information for the terminal, and then the terminal sends the CSI information to the network device in accordance with the codebook parameter information.

[0132] The codebook parameter information configured by the network device for the terminal includes at least one of the following: a number of SD basis vectors corresponding to each CSI-RS resource, a number of FD basis vectors corresponding to the CSI-RS resource, a number of PMI subbands, or a number of transmit antenna ports. According to an alternative embodiment, the codebook parameter information configured by the network device for the terminal includes at least one of the following: a number of SD basis vectors corresponding to each port group, a number of FD basis vectors corresponding to the port group, a number of PMI subbands, or a number of transmit antenna ports.

[0133] According to some embodiments, after the network device configures codebook parameter information for the terminal, the terminal determines parameters specified by the CSI in accordance with the configured codebook parameter information, and then sends the CSI information to the network device.

[0134] It should be noted that in the second situation the structure of the code book is expressed by the following formulas:

[0135] where W denotes the codebook structure, W _1,g denotes a matrix consisting of SD basis vectors or unit basis vectors for selecting a port corresponding to the CSI-RS resources in the g-th group, N _g denotes the number of CSI-RS resources in the g-th group, N _t denotes the number of transmit antenna ports, W _{f , g} denotes a matrix consisting of M _g FD basis vectors corresponding to the CSI-RS resource in the g-th group, M _g denotes the number of FD basis vectors selected for the g-th group, denotes a matrix consisting of combination coefficients corresponding to the CSI-RS resources in the g-th group, L _g denotes the number of SD basis vectors or the number of CSI-RS ports selected for the g-th group, G denotes the same as the number of CSI-RS resource groups in the CSI-RS resource set, G is a positive integer greater than 1, H denotes the Hermitian conjugation operation of the matrix, N ₃ denotes the number of PMI subbands, denotes a complex matrix with dimensions X rows and Y columns.

[0136] According to an alternative embodiment, here W denotes the structure of the codebook, W _1,g denotes a matrix consisting of SD basis vectors or unit basis vectors for selecting a port corresponding to the port groups in the g-th group, N _g denotes the number of port groups in the g-th group, N _t denotes the number of transmit antenna ports, W _{f ,g} denotes a matrix consisting of M _g basis vectors FD corresponding to the port groups in the g-th group, M _g denotes the number of FD basis vectors selected for the g-th group, denotes the matrix consisting of the combination coefficients corresponding to the port groups in the g-th group, L _g denotes the number of SD basis vectors or the number of CSI-RS ports selected for the g-th group, G denotes the same as the number of first groups among the port groups, G is a positive integer greater than 1, H denotes the Hermitian conjugation operation of the matrix, N ₂ denotes the number of PMI subbands, and denotes a complex matrix with dimensions X rows and Y columns.

[0137] In the third type of information, the CSI information includes at least one of the following information elements (1)-(3).

[0138] (1) The SD basis vector indicator information or the port selection indicator information, and the SD basis vector indicator information or the port selection indicator information corresponds to a plurality of CSI-RS resources.

[0139] The indication information of the SD basis vector is represented by the SD basis vector. The indication information of the SD basis vector indicates N*Nt SD basis vectors selected by the terminal. The indication information for port selection indicates N*N _t CSI-RS ports selected by the terminal, where N _t denotes the number of CSI-RS resources or the number of port groups, and a denotes the number of transmit antenna ports.

[0140] In addition, the CSI information sent by the terminal to the network device includes SD basic vector indication information or port selection indication information that actually correspond to a number of CSI-RS resources. It can also be understood as SD basic vector indication information or port selection indication information applied to multiple CSI-RS resources. In addition, each CSI-RS resource corresponds to one TRP, that is, SD basic vector indication information or port selection indication information corresponds to N TRPs, and the terminal reports SD basic vector indication information or port selection indication information corresponding to the N TRPs.

[0141] For example, the basis vector SD is used for explanation below. The basis vector SD is denoted as W ₁ , where or W ₁ denotes a matrix consisting of L SD basis vectors corresponding to a set of CSI-RS resources, N denotes the number of CSI-RS resources, N _t denotes the number of transmit antenna ports, L denotes the number of SD basis vectors or the number of CSI-RS ports corresponding to CSI-RS resources, P denotes the number of CSI-RS ports, denotes a complex matrix with dimensions A denotes a complex matrix of dimensions NP × 2L.

[0142] It should be noted that, as an example, an embodiment of the present disclosure is described using the SD basic vector indicator information or the port selection indicator information corresponding to the CSI-RS resources. According to another embodiment, the SD basic vector indicator information or the port selection indicator information may also correspond to a plurality of port groups in one CSI-RS resource.

[0143] The CSI information includes SD basis vector indicator information or port selection indicator information, and the SD basis vector indicator information or port selection indicator information corresponds to a plurality of port groups.

[0144] In addition, the CSI information sent by the terminal to the network device includes SD basic vector indication information or port selection indication information, which actually corresponds to a number of port groups. It can also be understood as SD basic vector indication information or port selection indication information applied to a plurality of port groups. In addition, each port group corresponds to one TRP, that is, SD basic vector indication information or port selection indication information corresponds to N TRPs, and the terminal reports an SD basic vector corresponding to the N TRPs.

[0145] For example, the basis vector SD is used for explanation below. The basis vector SD is denoted as W ₁ , where or W ₁ denotes a matrix consisting of L SD basis vectors corresponding to a set of port groups, N denotes the number of port groups, N _t denotes the number of transmit antenna ports, L denotes the number of SD basis vectors or the number of CSI-RS ports corresponding to CSI-RS resources, P denotes the number of CSI-RS ports, denotes a complex matrix with dimensions A denotes a complex matrix of dimensions NP × 2L.

[0146] (2) combination coefficient indicator information, and the combination coefficient indicator information corresponds to a plurality of CSI-RS resources.

[0147] According to one embodiment of the present disclosure, the CSI information sent by the terminal to the network device includes combination coefficient indicator information that is actually shared by a plurality of CSI-RS resources. This can also be understood as combination coefficient indicator information corresponding to a plurality of CSI-RS resources. In addition, each CSI-RS resource corresponds to one TRP, that is, N CSI-RS resources correspond to N TRPs, and the terminal reports combination coefficient indicator information shared by the plurality of TRPs.

[0148] For example, the indicator information of the combination coefficients is designated as it is a matrix of combination coefficients, and N denotes the number of CSI-RS resources, L denotes the number of SD basis vectors or the number of CSI-RS ports corresponding to the CSI-RS resources, M denotes the number of FD basis vectors corresponding to the CSI-RS resources, and denotes a complex matrix with dimensions 2L × M.

[0149] In some cases, if the number of CSI-RS resources is 2, the number of SD basis vectors corresponding to each CSI-RS resource is 4, L _i is 4, and the number of FD basis vectors corresponding to at least two CSI-RS resources is 4, then M is 4, and

[0150] It should be noted that, as an example, an embodiment of the present disclosure is described using indicator information corresponding to one CSI-RS resource. According to another embodiment, the indicator information of the combination coefficients may also correspond to a plurality of port groups in one CSI-RS resource.

[0151] According to one embodiment of the present disclosure, the CSI information sent by the terminal to the network device includes combination coefficient indicator information that is actually shared by a plurality of port groups. It can also be understood as combination coefficient indicator information corresponding to a plurality of port groups. In addition, each port group corresponds to one TRP, that is, N port groups correspond to N TRPs, and the terminal reports combination coefficient indicator information shared by the plurality of TRPs.

[0152] For example, the combination coefficient indicator information is designated as it is a matrix of combination coefficients, where N denotes the number of port groups, L denotes the number of SD basis vectors or the number of CSI-RS ports corresponding to CSI-RS resources, and M denotes the number of FD basis vectors corresponding to port groups.

[0153] In some cases, if the number of port groups is 2, and the number of basis vectors SD corresponding to each port group is 4, L _i is 4, and the number of basis vectors FD corresponding to at least two port groups is 4, then M is 4, and

[0154] (3) The FD basis vector indicator information, and the FD basis vector indicator information corresponds to a plurality of CSI-RS resources.

[0155] The FD basis vector indicator information indicates M FD basis vectors selected by the terminal. According to one embodiment of the present disclosure, the CSI information sent by the terminal to the network device includes the FD basis vector indicator information that is actually shared by a plurality of CSI-RS resources. It can also be understood as the FD basis vector indicator information corresponding to a plurality of CSI-RS resources. In addition, each CSI-RS resource corresponds to one TRP, that is, N CSI-RS resources correspond to N TRPs, and the terminal reports the FD basis vector indicator information shared by the plurality of TRPs.

[0156] For example, the index information of the basis vector FD is denoted as W _f , it is a matrix of the basis vector FD, and N ₃ denotes the number of PMI sub-bands, M denotes the number of FD basis vectors corresponding to CSI-RS resources, and denotes a complex matrix with dimensions N ₃ × M.

[0157] In some cases, if the number of FD basis vectors corresponding to at least two CSI-RS resources is 4, then M is 4, and

[0158] It should be noted that, as an example, an embodiment of the present disclosure is described using the SD basic vector indicator information corresponding to one CSI-RS resource. According to another embodiment, the SD basic vector indicator information may also correspond to a plurality of port groups in one CSI-RS resource.

[0159] According to an embodiment of the present disclosure, the CSI information sent by the terminal to the network device includes FD basis vector indicator information that is actually shared by a plurality of port groups. It can also be understood as FD basis vector indicator information corresponding to a plurality of port groups. In addition, each port group corresponds to one TRP, that is, N port groups correspond to N TRPs, and the terminal reports FD basis vector indicator information shared by the plurality of TRPs.

[0160] For example, the index information of the basis vector FD is denoted as W _f , it is a matrix of the basis vector FD, and N ₃ denotes the number of PMI sub-bands and M denotes the number of FD basis vectors corresponding to a port group, and denotes a complex matrix with dimensions N ₃ × M.

[0161] In some cases, if the number of FD basis vectors corresponding to at least two port groups is 4, then M is 4, and

[0162] It should also be noted that, as an example, an embodiment of the present disclosure is described using specific information indicated by the CSI information sent by the terminal to the network device. According to another embodiment, the network device needs to first configure the codebook parameter information for the terminal, and then the terminal sends the CSI information to the network device in accordance with the codebook parameter information.

[0163] The codebook parameter information configured by the network device for the terminal includes at least one of the following: a number of SD basis vectors corresponding to each CSI-RS resource, a number of FD basis vectors corresponding to the CSI-RS resource, a number of PMI subbands, or a number of transmit antenna ports. According to an alternative embodiment, the codebook parameter information configured by the network device for the terminal includes at least one of the following: a number of SD basis vectors corresponding to each port group, a number of FD basis vectors corresponding to the port group, a number of PMI subbands, or a number of transmit antenna ports.

[0164] According to some embodiments, after the network device configures codebook parameter information for the terminal, the terminal determines parameters specified by the CSI in accordance with the configured codebook parameter information, and then sends the CSI information to the network device.

[0165] It should be noted that in the third situation the structure of the code book is expressed by the following formulas:

[0166] here W denotes the codebook structure, N denotes the number of CSI-RS resources, N _t denotes the number of transmit antenna ports, L denotes the number of SD basis vectors or CSI-RS ports corresponding to the CSI-RS resources, M denotes the number of FD basis vectors corresponding to the CSI-RS resources, N ₃ denotes the number of PMI subbands, W ₁ denotes a matrix consisting of L SD basis vectors or unit basis vectors for selecting a port for the CSI-RS resources, denotes a matrix consisting of the index information of the combination coefficients, W _f denotes a matrix consisting of M frequency domain basis vectors, H denotes the Hermitian conjugation operation of the matrix, and denotes a complex matrix with dimensions X rows and Y columns.

[0167] It should be noted that all three of the above situations are described using the combination coefficient indicator information. According to another embodiment, the combination coefficient indicator information includes a plurality of types of information.

[0168] In some cases, the combination coefficient indicator information includes information about a non-zero coefficient and information about the position of the non-zero coefficient, the non-zero coefficient information indicates a non-zero coefficient in the combination coefficient indicator information, and the non-zero coefficient position information indicates a position of the non-zero coefficient in the combination coefficient indicator information.

[0169] It should also be noted that, as an example, an embodiment of the present disclosure is described using specific information indicated by the CSI information sent by the terminal to the network device. According to another embodiment, the network device needs to first configure the codebook parameter information for the terminal, and then the terminal sends the CSI information to the network device in accordance with the codebook parameter information.

[0170] The codebook parameter information configured by the network device for the terminal includes at least one of the following: a number of SD basis vectors corresponding to each CSI-RS resource, a number of FD basis vectors corresponding to the CSI-RS resource, a number of PMI subbands, or a number of transmit antenna ports. According to an alternative embodiment, the codebook parameter information configured by the network device for the terminal includes at least one of the following: a number of SD basis vectors corresponding to each port group, a number of FD basis vectors corresponding to the port group, a number of PMI subbands, or a number of transmit antenna ports.

[0171] According to some embodiments, after the network device configures codebook parameter information for the terminal, the terminal determines parameters specified by the CSI in accordance with the configured codebook parameter information, and then sends the CSI information to the network device.

[0172] In a solution according to an embodiment of the present disclosure, the parameters indicated by the CSI information include a plurality of situations, which expands the properties of the said parameters and thus improves the diversity of the said parameters.

[0173] According to the embodiment shown in Fig. 3, a specific process of sending CSI information by the terminal is shown in Fig. 4. As shown in Fig. 4, the method provides steps 401-403 described below.

[0174] In step 401, the terminal determines, according to the channel information or the true channel information corresponding to each CSI-RS resource and the codebook parameter information, the indicator information of the SD basis vector or the indicator information for selecting a port, the indicator information of the combination coefficients, and the indicator information of the FD basis vector.

[0175] True channel information refers to channel information that can be used, and can also be understood as channel information including true parameters.

[0176] According to one embodiment of the present disclosure, after measuring each CSI-RS resource, the terminal may determine channel information or true channel information corresponding to each CSI-RS resource, and the terminal may also determine indication information of the SD basis vector or indication information for selecting a port according to the determined channel information or true channel information and the codebook parameter information, and after the terminal determines the indication information of the SD basis vector or the indication information for selecting a port, the terminal may also determine indication information of the combination coefficients and indication information of the FD basis vector.

[0177] In step 402, the terminal sends CSI to the network device, wherein the CSI information includes indication information of the SD basis vector or indication information for selecting a port, indication information of the combination coefficients, and indication information of the FD basis vector.

[0178] In step 403, the network device receives CSI from the terminal, wherein the CSI information includes indication information of the SD basis vector or indication information for selecting a port, indication information of combination coefficients, and indication information of the FD basis vector.

[0179] According to embodiments of the present disclosure, after the terminal determines the SD basis vector indicator information or the port selection indicator information, the combination coefficient indicator information, and the FD basis vector indicator information, CSI information may be further determined. The CSI may contain the above three types of information determined by the terminal, and the CSI is then sent to the network device. The network device may then receive the CSI from the terminal.

[0180] In a solution according to an embodiment of the present disclosure, after measuring the CSI-RS corresponding to each CSI-RS resource, the indication information reported to the network device includes information shared by a plurality of TRPs and individual parameters for each TRP, so that the network device can determine precoding of the terminal according to the parameters reported by the terminal, which not only reduces the overhead of reverse data transmission by reporting the shared parameters, but also improves the benefits of precoding of the terminal by integrating the parameters of the plurality of TRPs.

[0181] According to the embodiment shown in Fig. 3, the network device configures the parameters of the codebook for the terminal using the configuration information. As shown in Fig. 5, the method provides the steps 501-502 described below.

[0182] In step 501, the network device sends configuration information to the terminal, wherein the configuration information is used to configure the parameter information of the codebook, and the parameter information of the codebook is used by the terminal to determine the CSI.

[0183] In step 502, the terminal receives configuration information from the network device, wherein the configuration information is used to configure codebook parameter information, and the codebook parameter information is used by the terminal to determine the CSI.

[0184] According to an embodiment of the present disclosure, a network device sends configuration information to a terminal and configures codebook parameter information for the terminal using the configuration information. Subsequently, the terminal can send CSI to the network device based on the codebook parameter information.

[0185] According to some embodiments, before the network device sends the configuration information to the terminal, the network device also first determines the structure of the codebook in order to configure the terminal with the codebook parameter information corresponding to the structure of the codebook based on the structure of the codebook.

[0186] In some cases, the terminal determines the structure of the codebook and then indicates the determined structure of the codebook to the network device using the designation information.

[0187] The terminal sends first indication information to the network device, wherein the first indication information indicates the received codebook structure.

[0188] In some cases, the network device determines the structure of the codebook and then indicates the structure of the codebook to the terminal using pointer information.

[0189] The terminal receives second indication information from the network device, wherein the second indication information indicates the received codebook structure.

[0190] It should be noted that, as an example, an embodiment of the present disclosure is described using indication information indicating a codebook structure. According to another embodiment, the codebook structure is negotiated between the network device and the terminal using a protocol, and the network device directly configures the terminal with codebook parameter information corresponding to the negotiated codebook structure.

[0191] In a solution according to an embodiment of the present disclosure, after the network device determines the structure of the codebook, the network device configures the parameter information of the codebook for the terminal in accordance with the structure of the codebook, which improves the accuracy of the parameter information of the codebook configured by the network device.

[0192] It should be noted that the above-mentioned embodiments may be divided into new embodiments or combined with other embodiments to form new embodiments. Combinations of embodiments are not limited in any way in the present disclosure.

[0193] Fig. 6 shows a flow chart of a method for determining pre-coding based on a codebook according to an illustrative embodiment of the present disclosure, which can be illustratively applied to the terminal shown in Fig. 1. The method includes at least part of the following content.

[0194] In step 601, the terminal determines channel information corresponding to each CSI-RS resource based on at least two CSI-RS resources.

[0195] CSI-RS resources are used to transmit CSI-RS. In addition, CSI-RS resources are configured by a network device, and the network device can send CSI-RS to a terminal using the configured CSI-RS resources.

[0196] According to an embodiment of the present disclosure, a terminal measures a CSI-RS based on at least one CSI-RS resource to obtain channel information corresponding to each measured CSI-RS resource.

[0197] According to some embodiments, the CSI-RS resource is a Channel Measurement Resource (CMR). That is, according to some embodiments of the present disclosure, the CSI-RS resource is a CMR resource.

[0198] In some cases, different CMRs belong to the same CSI-RS resource set or to different CSI-RS resource sets.

[0199] According to some embodiments, each CSI-RS resource in at least one CSI-RS resource corresponds to one TRP, and at least two TRPs are used for coherent joint transmission (CJT).

[0200] According to some other embodiments, each of the plurality of port groups in one CSI-RS resource corresponds to one TRP, and at least two TRPs are configured for the CJT.

[0201] One CSI-RS resource corresponds to a plurality of CSI-RS ports, the plurality of CSI-RS ports are obtained by grouping the plurality of CSI-RS ports, each port group includes at least one CSI-RS port, and each port group corresponds to one TRP.

[0202] In step 602, the terminal sends CSI to the network device according to the channel information determined according to each CSI-RS resource and the codebook parameter information. The CSI information includes indicator information corresponding to a plurality of CSI-RS resources and indicator information corresponding to each CSI-RS resource, or the CSI includes indicator information corresponding to a plurality of port groups in one CSI-RS resource and indicator information corresponding to each port group, the port group includes a plurality of CSI-RS ports corresponding to the CSI-RS resource, and the CSI information is configured to pre-code the terminal based on the codebook structure corresponding to the codebook parameter information.

[0203] The codebook parameter information is used by the terminal to report the indication information so that the network device can determine the precoding of the terminal. In addition, the codebook parameter information corresponds to the codebook structure. In other words, the precoding of the terminal can be determined according to the codebook structure corresponding to the codebook parameter information and the CSI. In addition, the CSI information according to the embodiments of the disclosure is used to determine the precoding of the terminal based on the codebook structure corresponding to the codebook parameter information, and the CSI includes the indication information. That is, the indication information included in the CSI is used to determine the precoding of the terminal based on the codebook structure corresponding to the codebook parameter information.

[0204] The CSI information includes indication information corresponding to a plurality of CSI-RS resources and indication information corresponding to each CSI-RS resource. The indication information corresponding to a plurality of CSI-RS resources means that the indication information included in the CSI for determining the precoding of the terminal can be applied to each CSI-RS resource. That is, the transmission of the indication information can be applied to each CSI-RS resource. The indication information corresponding to each CSI-RS resource means that the parameters included in the CSI for determining the precoding of the terminal are applied to one CSI-RS resource. That is, the indication information corresponding to each CSI-RS resource is applied to the corresponding CSI-RS resource, but is not applied to other CSI-RS resources.

[0205] According to an alternative embodiment, the CSI includes indication information corresponding to a plurality of port groups in one CSI-RS resource and indication information corresponding to each port group, and the port group includes a plurality of CSI-RS ports corresponding to the CSI-RS resource. The indication information corresponding to a plurality of port groups means that the indication information included in the CSI for determining the terminal precoding can be applied to each port group. That is, transmission of the indication information can be applied to each port group. The indication information corresponding to each port group means that the indication information included in the CSI for determining the terminal precoding is applied to one port group. That is, the parameters corresponding to each port group are applied to the corresponding port group, but are not applied to other port groups.

[0206] According to embodiments of the present disclosure, after the terminal determines channel information corresponding to each CSI-RS resource in at least one CSI-RS resource, the terminal determines indicator information to be reported to the network device based on the obtained channel information and codebook parameter information. Then, the terminal sends the CSI including the indicator information to the network device, and the CSI is used to determine precoding parameters of the terminal.

[0207] If at least one CSI-RS resource includes a plurality of CSI-RS resources, the terminal determines channel information corresponding to each CSI-RS resource. If at least one CSI-RS resource includes one CSI-RS resource, and one CSI-RS resource corresponds to a plurality of CSI-RS ports, the terminal determines channel information corresponding to each port group in the plurality of port groups.

[0208] According to some embodiments, the network device configures codebook parameter information for the terminal using radio resource control (RRC) signaling or other signaling.

[0209] According to some embodiments, the terminal determines, according to the channel information corresponding to each CSI-RS resource and the codebook parameter information, the indicator information of the SD basis vector, the indicator information of the combination coefficients, and the indicator information of the FD basis vector, and the terminal sends to the network device the CSI information including the indicator information of the SD basis vector or the indicator information for selecting a port, the indicator information of the combination coefficients, and the indicator information of the FD basis vector.

[0210] According to an embodiment of the present disclosure, after the terminal measures each CSI-RS resource, the terminal can determine channel information corresponding to each CSI-RS resource, and the terminal can also determine indicator information of the SD basis vector based on the determined channel information and the codebook parameter information. After the terminal determines the indicator information of the SD basis vector, the terminal can further determine indicator information of the combination coefficients and indicator information of the FD basis vector according to the indication information of the SD basis vector and the codebook parameter information. After the terminal determines the indicator information of the SD basis vector, the indicator information of the combination coefficients and the indicator information of the FD basis vector, the terminal can further determine the CSI information. The CSI may contain the above three types of information determined by the terminal, and the CSI is sent to the network device.

[0211] According to the embodiment shown in Fig. 6, the CSI sent by the terminal includes information elements, and the included information elements include various situations.

[0212] The first CSI information element includes at least one of the following information items (1)-(3).

[0213] (1) N pieces of SD basis vector indicator information or N pieces of port selection indicator information, where N is the same as the number of CSI-RS resources and N is a positive integer greater than 1.

[0214] The SD basis vector indicator information is represented by the SD basis vector. The SD basis vector indicator information indicates L _i SD basis vectors selected by the terminal, where i belongs to the set {1,2…, N}. According to some embodiments, the SD basis vector indicator information is an SD beam basis vector, which may be called a beam basis vector, or an SD basis vector, or a beam. The port selection indicator information indicates L _i CSI-RS ports selected by the terminal.

[0215] In addition, the CSI information sent by the terminal to the network device includes N pieces of SD basic vector indication information or N pieces of port selection indication information, which actually correspond to the number of CSI-RS resources. This can also be understood as a one-to-one correspondence between the pieces of SD basic vector indication information or the pieces of port selection indication information and the CSI-RS resources. In addition, each CSI-RS resource corresponds to one TRP, that is, N CSI-RS resources correspond to N TRPs, and the terminal reports a piece of SD basic vector indication information or a piece of port selection indication information corresponding to each TRP.

[0216] For example, the SD basis vector indicator information is used for explanation below. The SD basis vector indicated by the SD basis vector indicator information is denoted as moreover or W _1,i is a matrix consisting of L _i SD basis vectors corresponding to the i-th CSI-RS resource, N denotes the number of CSI-RS resources, N _t denotes the number of transmit antenna ports, L _i denotes the number of SD basis vectors or the number of CSI-RS ports corresponding to the i-th CSI-RS resource, and P is the number of CSI-RS ports. is a complex matrix with dimensions X rows and Y columns, for example, X is N _t and Y is 2L _t , that is, The complex matrix according to the following embodiments is similar in an embodiment of the present invention, which is not repeated further herein.

[0217] In some cases, if the number of CSI-RS resources is 2, the number of SD basis vectors corresponding to each CSI-RS resource is 4, and L _i is 4, then

[0218] It should be noted that, as an example, an embodiment of the present disclosure is described using N pieces of SD basic vector indicator information or N pieces of port selection indicator information corresponding to CSI-RS resources. According to another embodiment, N pieces of SD basic vector indicator information or N pieces of port selection indicator information may also correspond to a plurality of port groups in one CSI-RS resource.

[0219] The CSI information includes N pieces of SD basis vector indication information or N pieces of port selection indication information, and N is the same as the number of port groups, and N is a positive integer that is greater than 1.

[0220] The CSI information sent by the terminal to the network device includes N pieces of SD basic vector indication information or N pieces of port selection indication information, which actually correspond to the number of port groups. This can also be understood as a one-to-one correspondence between the pieces of SD basic vector indication information or the pieces of port selection indication information and the port groups. In addition, each port group corresponds to one TRP, that is, N port groups correspond to N TRPs, and the terminal reports a piece of SD basic vector indication information or a piece of port selection indication information corresponding to each TRP.

[0221] For example, the SD basis vector designation information is used below for explanation. The SD basis vector specified by the SD basis vector designation information is denoted as W _1.i , where or is a matrix L _i consisting of SD basis vectors corresponding to the i-th group of ports, N denotes the number of at least two groups of ports N _t , denotes the number of transmitting antenna ports, L _i denotes the number of SD basis vectors or the number of CSI-RS ports corresponding to the i-th group of ports, and P is the number of CSI-RS ports.

[0222] In some cases, if the number of port groups is 2, the number of SD basis vectors corresponding to each port group is 4, and L _i is 4, then

[0223] (2) combination coefficient indicator information, and the combination coefficient indicator information corresponds to a plurality of CSI-RS resources.

[0224] According to one embodiment of the present disclosure, the CSI information sent by the terminal to the network device includes combination coefficient indicator information that is actually shared by a plurality of CSI-RS resources, and it can also be understood as combination coefficient indicator information corresponding to the plurality of CSI-RS resources. In addition, each CSI-RS resource corresponds to one TRP, that is, N CSI-RS resources correspond to N TRPs, and the terminal reports combination coefficient indicator information shared by the plurality of TRPs.

[0225] For example, the combination coefficient matrix indicated by the combination coefficient indicator information is denoted as , and N denotes the number of CSI-RS resources, L _i denotes the number of parts of the SD basis vector pointer information or the number of CSI-RS ports corresponding to the i-th CSI-RS resource, , and M denotes the number of frequency domain (FD) basis vectors corresponding to the CSI-RS resource.

[0226] In some cases, if the number of CSI-RS resources is 2, the number of SD basis vectors corresponding to each CSI-RS resource is 4, L _i is 4, and the number of FD basis vectors corresponding to at least two CSI-RS resources is 4, then M is 4, and

[0227] It should be noted that, as an example, an embodiment of the present disclosure is described using indicator information corresponding to one CSI-RS resource. According to another embodiment, the indicator information of the combination coefficients may also correspond to a plurality of port groups in one CSI-RS resource.

[0228] The CSI information includes combination coefficient indicator information, and the combination coefficient indicator information corresponds to a plurality of port groups.

[0229] According to one embodiment of the present disclosure, the CSI information sent by the terminal to the network device includes combination coefficient indicator information that is actually shared by a plurality of port groups, and it can also be understood as combination coefficient indicator information corresponding to a plurality of port groups. In addition, each port group corresponds to one TRP, that is, N port groups correspond to N TRPs, and the terminal reports combination coefficient indicator information shared by the plurality of TRPs.

[0230] For example, the combination coefficient matrix indicated by the combination coefficient indicator information is denoted as , and N denotes the number of port groups, L _i denotes the number of SD basis vectors or the number of CSI-RS ports corresponding to the i-th port group, and M denotes the number of FD basis vectors corresponding to a port group.

[0231] In some cases, if the number of port groups is 2, and the number of basis vectors SD corresponding to each port group is 4, L _i is 4, and the number of basis vectors FD corresponding to at least two port groups is 4, then M is 4, and

[0232] (3) The FD basis vector indicator information, and the FD basis vector indicator information corresponds to a plurality of CSI-RS resources.

[0233] The FD basis vector indicator information indicates M FD basis vectors selected by the terminal. The FD basis vector indicator information is used to represent a channel change rule in the FD. The FD basis vectors can mainly be used to represent a change rule for the weight of each SD basis vector in each FD block. The change rule represented by the FD basis is related to factors such as multipath delay.

[0234] According to one embodiment of the present disclosure, the CSI information sent by the terminal to the network device includes FD basis vector indicator information that is actually shared by a plurality of CSI-RS resources, and it can also be understood as FD basis vector indicator information corresponding to the plurality of CSI-RS resources. In addition, each CSI-RS resource corresponds to one TRP, that is, N CSI-RS resources correspond to N TRPs, and the terminal reports the FD basis vector indicator information shared by the plurality of TRPs.

[0235] For example, the FD basis vector indicated in the FD basis vector indication information is denoted as W _{f ,} which is a matrix of the FD basis vector, N ₃ denotes the number of sub-bands of the precoding matrix indication (PMI), and M denotes the number of FD basis vectors corresponding to the CSI-RS resources.

[0236] In some cases, if the number of FD basis vectors corresponding to at least two CSI-RS resources is 4, then M is 4, and

[0237] It should be noted that, as an example, an embodiment of the present disclosure is described using the FD basic vector indicator information corresponding to one CSI-RS resource. According to another embodiment, the FD basic vector indicator information may also correspond to a plurality of port groups in one CSI-RS resource.

[0238] The CSI information includes FD basis vector indicator information, and the FD basis vector indicator information corresponds to a plurality of port groups.

[0239] According to one embodiment of the present disclosure, the CSI information sent by the terminal to the network device includes FD basis vector indicator information that is actually shared by a plurality of port groups, and it can also be understood as FD basis vector indicator information corresponding to a plurality of port groups. In addition, each port group corresponds to one TRP, that is, N port groups correspond to N TRPs, and the terminal reports FD basis vector indicator information shared by the plurality of TRPs.

[0240] For example, the FD basis vector specified in the FD basis vector designation information is denoted as W _f , it is a matrix of the FD basis vector, N ₃ denotes the number of PMI sub-bands, and M denotes the number of FD basis vectors corresponding to a port group.

[0241] In some cases, if the number of basis vectors FD corresponding to at least two groups of ports is 4, then M is 4, and

[0242] It should be noted that the SD basis vector indicator information, the combination coefficient indicator information, and the FD basis vector indicator information indicated by the CSI information according to the embodiments of the present disclosure simultaneously correspond to CSI-RS resources or port groups.

[0243] In addition, it should be noted that, as an example, an embodiment of the present disclosure is described using specific information indicated by the CSI sent by the terminal to the network device. According to another embodiment, the network device needs to first configure the codebook parameter information for the terminal, and then the terminal sends the CSI information to the network device in accordance with the codebook parameter information.

[0244] The codebook parameter information configured by the network device for the terminal includes at least one of the following: a number of SD basis vectors corresponding to each CSI-RS resource, a number of FD basis vectors corresponding to the CSI-RS resource, a number of PMI subbands, or a number of transmit antenna ports. According to an alternative embodiment, the codebook parameter information configured by the network device for the terminal includes at least one of the following: a number of SD basis vectors corresponding to each port group, a number of FD basis vectors corresponding to the port group, a number of PMI subbands, or a number of transmit antenna ports.

[0245] According to some embodiments, after the network device configures codebook parameter information for the terminal, the terminal determines parameters specified by the CSI in accordance with the configured codebook parameter information, and then sends the CSI information to the network device.

[0246] In the second type of information, a plurality of CSI-RS resources are grouped to obtain G CSI-RS resource groups, and the CSI contains information corresponding to each CSI-RS resource group of the G CSI-RS resource groups. The value of G coincides with the number of CSI-RS resource groups in the plurality of CSI-RS resources, the CSI-RS resource group includes at least one CSI-RS resource, and G is a positive integer that is greater than 1. According to an alternative embodiment, a plurality of port groups are grouped to obtain G first groups, and the CSI contains information corresponding to each of the G first groups. The value of G coincides with the number of first groups among the plurality of port groups, the first group includes at least one port group, and G is a positive integer that is greater than 1.

[0247] The CSI information comprises at least one of the following information elements:

[0248] (1) G pieces of designation information of the SD basis vector or G pieces of designation information for selecting a port (1)-(3).

[0249] The SD basis vector indicator information is represented by the SD basis vector. The SD basis vector indicator information indicates L _g SD basis vectors selected by the terminal, where L _g denotes the number of SD basis vectors corresponding to the g-th CSI-RS resource group, L _g represents the number and value of the SD basis vectors corresponding to each CSI-RS resource in the g-th CSI-RS resource group. According to an alternative embodiment, the port selection indicator information indicates L _g CSI-RS ports selected by the terminal, where L _g denotes the number of CSI-RS ports corresponding to the g-th first group, L _g represents the number and value of CSI-RS ports corresponding to each port group in the g-th first group.

[0250] In addition, the CSI information sent by the terminal to the network device includes G pieces of SD basic vector indication information or G pieces of port selection indication information, which actually correspond to the number G of CSI-RS resource groups. This can also be understood as a one-to-one correspondence between the pieces of SD basic vector indication information or the pieces of port selection indication information and the CSI-RS resource groups. In addition, each CSI-RS resource group includes at least one CSI-RS resource, and each CSI-RS resource corresponds to one TRP, that is, the terminal reports a piece of SD basic vector indication information or a piece of port selection indication information corresponding to the CSI-RS resource in each CSI-RS resource group.

[0251] For example, the SD basis vector is used for explanation below. The SD basis vector is denoted as , Where denotes a matrix consisting of one or more SD basis vectors corresponding to the g-th CSI-RS resource group, N _g denotes the number of CSI-RS resources or the number of port groups in the g-th group, N _t denotes the number of transmit antenna ports, L _g denotes the number of SD basis vectors or the number of CSI-RS ports selected for the g-th group, and denotes a complex matrix with dimensions

[0252] In some cases, an embodiment of the present disclosure includes 4 CSI-RS resources, wherein CSI-RS resource 1 and CSI-RS resource 2 are the first group of CSI-RS resources, CSI-RS resource 3 and CSI-RS resource 4 are the second group of CSI-RS resources, and CSI-RS resource 1, CSI-RS resource 2, CSI-RS resource 3 and CSI-RS resource 4 correspond to points TRP1, TRP2, TRP3 and TRP4, respectively, which can also be understood in such a way that TRP1 and TRP2 are the first group of CSI-RS resources, TRP3 and TRP4 are the second group of CSI-RS resources. The number of basis vectors SD is L ₁ = L ₂ = 4, L ₃ = L ₄ = 3, then denotes a complex matrix with dimensions A denotes a complex matrix of dimensions 2N _t × 12.

[0253] It should be noted that, as an example, an embodiment of the present disclosure is described using grouping of CSI-RS resources to obtain G groups of CSI-RS resources. According to another embodiment, the G first groups can be obtained by grouping a plurality of port groups into one CSI-RS resource.

[0254] In addition, the CSI information sent by the terminal to the network device contains G pieces of indication information of the SD basic vector or G pieces of indication information for selecting a port, which actually correspond to the number G of first groups. This can also be understood as a one-to-one correspondence between the pieces of indication information of the SD basic vector or the pieces of indication information for selecting a port and the first groups. In addition, each first group includes at least one port group, and each port group corresponds to one TRP, that is, the terminal reports a piece of indication information of the SD basic vector or a piece of indication information for selecting a port corresponding to a port group in each first group.

[0255] For example, the SD basis vector is used for explanation below. The SD basis vector is denoted as , Where denotes the matrix consisting of the SD basis vectors corresponding to the g-th first group, N _g denotes the number of CSI-RS resources or the number of port groups in the g-th group, N _t denotes the number of transmit antenna ports, L _g denotes the number of SD basis vectors or the number of CSI-RS ports selected for the g-th group, and denotes a complex matrix with dimensions .

[0256] In some cases, an embodiment of the present disclosure includes 4 port groups, where port group 1 and port group 2 are the 1st first group, port group 3 and port group 4 are the 2nd first group, and port group 1, port group 2, port group 3 and port group 4 correspond to points TRP1, TRP2, TRP3 and TRP4, respectively, which can also be understood in such a way that points TRP1 and TRP2 are the 1st first group, points TRP3 and TRP4 are the 2nd first group. The number of basis vectors SD is L ₁ = L ₂ = 4, L ₃ = L ₄ = 3, then And denotes a complex matrix with dimensions A denotes a complex matrix of dimensions 2N _t × 12.

[0257] (2) G parts of the combination coefficient indicator information.

[0258] According to one embodiment of the present disclosure, the CSI information sent by the terminal to the network device includes G pieces of combination coefficient indicator information, which actually correspond to the number G of CSI-RS resource groups. This can also be understood as a one-to-one correspondence between the pieces of combination coefficient indicator information and the CSI-RS resource groups. In addition, each CSI-RS resource group includes at least one CSI-RS resource, and each CSI-RS resource corresponds to one TRP, that is, the terminal reports a piece of combination coefficient indicator information corresponding to the CSI-RS resource in each CSI-RS resource group.

[0259] For example, the indicator information of the combination coefficients is designated as , it is a matrix of combination coefficients. N _g denotes the number of CSI-RS resources in the g-th group, L _g denotes the number of CSI-RS ports selected for the g-th group, M _g denotes the number of FD basis vectors selected for the g-th group, and denotes a complex matrix with dimensions 2L _g × M _g .

[0260] In some cases, an embodiment of the present disclosure includes 4 CSI-RS resources, wherein CSI-RS resource 1 and CSI-RS resource 2 are the first group of CSI-RS resources, CSI-RS resource 3 and CSI-RS resource 4 are the second group of CSI-RS resources, and CSI-RS resource 1, CSI-RS resource 2, CSI-RS resource 3 and CSI-RS resource 4 correspond to points TRP1, TRP2, TRP3 and TRP4, respectively, which can also be understood in such a way that TRP1 and TRP2 are the first group of CSI-RS resources, TRP3 and TRP4 are the second group of CSI-RS resources. The number of basis vectors SD is L ₁ = L ₂ = 4, L ₃ = L ₄ = 3. The number of basis vectors FD corresponding to one of the two groups is M ₁ = 4, the number of basis vectors FD corresponding to the other of the two groups is M ₂ = 7, Here

[0261] It should be noted that, as an example, an embodiment of the present disclosure is described using grouping of CSI-RS resources to obtain G groups of CSI-RS resources. According to another embodiment, the G first groups can be obtained by grouping a plurality of port groups into one CSI-RS resource.

[0262] According to one embodiment of the present disclosure, the CSI information sent by the terminal to the network device includes G pieces of combination coefficient indicator information, which actually correspond to the number G of first groups. This can also be understood as a one-to-one correspondence between the pieces of combination coefficient indicator information and the first groups. In addition, each first group includes at least one port group, and each port group corresponds to one TRP, that is, the terminal reports combination coefficient indicator information corresponding to a port group in each first group.

[0263] For example, the indicator information of the combination coefficients is designated as it is a matrix of combination coefficients. , N _g denotes the number of port groups in the g-th group, L _g denotes the number of CSI-RS ports selected for the g-th group, M _g denotes the number of FD basis vectors selected for the g-th group, and denotes a complex matrix with dimensions

[0264] In some cases, an embodiment of the present disclosure includes 4 port groups, where port group 1 and port group 2 are the 1st first group, port group 3 and port group 4 are the 2nd first group, and port group 1, port group 2, port group 3 and port group 4 correspond to points TRP1, TRP2, TRP3 and TRP4, respectively, which can also be understood in such a way that points TRP1 and TRP2 are the 1st first group, points TRP3 and TRP4 are the 2nd first group. The number of basis vectors SD is L ₁ = L ₂ = 4, L ₃ = L ₄ = 3. The number of basis vectors FD corresponding to one of the two groups is M ₁ = 4, the number of basis vectors FD corresponding to the other of the two groups is M ₂ = 7, Here

[0265] (3) G parts of the reference information of the basis vector FD.

[0266] According to one embodiment of the present disclosure, the CSI information sent by the terminal to the network device includes G pieces of FD reference vector information, which actually correspond to the number G of CSI-RS resource groups. This can also be understood as a one-to-one correspondence between the pieces of FD reference vector information and the CSI-RS resource groups. In addition, each CSI-RS resource group includes at least one CSI-RS resource, and each CSI-RS resource corresponds to one TRP, that is, the terminal reports the FD reference vector corresponding to the CSI-RS resource in each CSI-RS resource group.

[0267] For example, the basis vector FD is denoted as , it is the matrix of the basis vector FD. In , N denotes the number of CSI-RS resources, M _g denotes the number of FD basis vectors selected for the g-th group, H denotes the Hermitian conjugation operation of the matrix, and denotes a complex matrix of dimensions N ₃ × M _g .

[0268] In some cases, an embodiment of the present disclosure includes 4 CSI-RS resources, wherein CSI-RS resource 1 and CSI-RS resource 2 are the first group of CSI-RS resources, CSI-RS resource 3 and CSI-RS resource 4 are the second group of CSI-RS resources, and CSI-RS resource 1, CSI-RS resource 2, CSI-RS resource 3 and CSI-RS resource 4 correspond to points TRP1, TRP2, TRP3 and TRP4, respectively, which can also be understood in such a way that TRP1 and TRP2 are the first group of CSI-RS resources, TRP3 and TRP4 are the second group of CSI-RS resources. The number of basis vectors SD is L ₁ = L ₂ = 4, L ₃ = L ₄ = 3. The number of basis vectors FD corresponding to one of the two groups is M ₁ = 4, the number of basis vectors FD corresponding to the other of the two groups is M ₂ = 7, Here

[0269] It should be noted that, as an example, an embodiment of the present disclosure is described using grouping of CSI-RS resources to obtain G groups of CSI-RS resources. According to another embodiment, the G first groups can be obtained by grouping a plurality of port groups into one CSI-RS resource.

[0270] According to an embodiment of the present disclosure, the CSI information sent by the terminal to the network device includes G FD basis vectors. G parts of the FD basis vector indication information actually correspond to the number G of first groups, which can also be understood as a one-to-one correspondence between the parts of the FD basis vector indication information and the first groups. In addition, each first group includes at least one port group, and each port group corresponds to one TRP, that is, the terminal reports the FD basis vector corresponding to the port group in each first group.

[0271] For example, the basis vector FD is denoted as , it is the matrix of the basis vector FD. In H denotes the Hermitian conjugation operation of the matrix, N _g denotes the number of CSI-RS resources or the number of port groups in the g-th group, H denotes the Hermitian conjugation operation of the matrix, N ₃ denotes the number of PMI subbands, M _g denotes the number of FD basis vectors selected for the g-th group, and denotes a complex matrix of dimensions N ₃ × M _g .

[0272] In some cases, an embodiment of the present disclosure includes 4 port groups, where port group 1 and port group 2 are the 1st first group, port group 3 and port group 4 are the 2nd first group, and port group 1, port group 2, port group 3 and port group 4 correspond to points TRP1, TRP2, TRP3 and TRP4, respectively, which can also be understood in such a way that points TRP1 and TRP2 are the 1st first group, points TRP3 and TRP4 are the 2nd first group. The number of basis vectors SD is L ₁ = L ₂ = 4, L ₃ = L ₄ = 3. The number of basis vectors FD corresponding to one of the two groups is M ₁ = 4, the number of basis vectors FD corresponding to the other of the two groups is M ₂ = 7, Here

[0273] It should be noted that the SD basis vector indicator information, the combination coefficient indicator information, and the FD basis vector indicator information indicated by the CSI information according to an embodiment of the present disclosure simultaneously correspond to a CSI-RS resource group or the first group in a port group.

[0274] It should also be noted that, as an example, an embodiment of the present disclosure is described using specific information indicated by the CSI information sent by the terminal to the network device. According to another embodiment, the network device needs to first configure the codebook parameter information for the terminal, and then the terminal sends the CSI information to the network device in accordance with the codebook parameter information.

[0275] The codebook parameter information configured by the network device for the terminal includes at least one of the following: a number of SD basis vectors corresponding to each CSI-RS resource, a number of FD basis vectors corresponding to the CSI-RS resource, a number of PMI subbands, or a number of transmit antenna ports. According to an alternative embodiment, the codebook parameter information configured by the network device for the terminal includes at least one of the following: a number of SD basis vectors corresponding to each port group, a number of FD basis vectors corresponding to the port group, a number of PMI subbands, or a number of transmit antenna ports.

[0276] According to some embodiments, after the network device configures codebook parameter information for the terminal, the terminal determines parameters specified by the CSI in accordance with the configured codebook parameter information, and then sends the CSI information to the network device.

[0277] In the third type of information, the CSI information includes at least one of the following information elements (1)-(3).

[0278] (1) the SD basic vector indicator information or the port selection indicator information, and the SD basic vector indicator information or the port selection indicator information corresponds to a plurality of CSI-RS resources.

[0279] The designation information of the SD basis vector is represented by the SD basis vector. The designation information of the SD basis vector indicates N*N _t SD basis vectors selected by the terminal. The designation information for port selection indicates N*N _t CSI-RS ports selected by the terminal, where N denotes the number of CSI-RS resources or the number of port groups, and N _t denotes the number of transmit antenna ports.

[0280] In addition, the CSI information sent by the terminal to the network device includes SD basic vector indication information or port selection indication information that actually correspond to a number of CSI-RS resources. It can also be understood as SD basic vector indication information or port selection indication information applied to multiple CSI-RS resources. In addition, each CSI-RS resource corresponds to one TRP, that is, SD basic vector indication information or port selection indication information corresponds to N TRPs, and the terminal reports SD basic vector indication information or port selection indication information corresponding to the N TRPs.

[0281] For example, the basis vector SD is used for explanation below. The basis vector SD is denoted as W ₁ , where or W ₁ denotes a matrix consisting of L SD basis vectors corresponding to a set of CSI-RS resources, N denotes the number of CSI-RS resources, N _t denotes the number of transmit antenna ports, L denotes the number of SD basis vectors or the number of CSI-RS ports corresponding to CSI-RS resources, P denotes the number of CSI-RS ports, denotes a complex matrix with dimensions , A denotes a complex matrix of dimensions NP × 2L.

[0282] It should be noted that, as an example, an embodiment of the present disclosure is described using the SD basic vector indicator information or the port selection indicator information corresponding to the CSI-RS resources. According to another embodiment, the SD basic vector indicator information or the port selection indicator information may also correspond to a plurality of port groups in one CSI-RS resource.

[0283] The CSI information includes SD basis vector indicator information or port selection indicator information, and the SD basis vector indicator information or port selection indicator information corresponds to a plurality of port groups.

[0284] In addition, the CSI information sent by the terminal to the network device includes SD basic vector indication information or port selection indication information, which actually corresponds to a number of port groups. It can also be understood as SD basic vector indication information or port selection indication information applied to a plurality of port groups. In addition, each port group corresponds to one TRP, that is, SD basic vector indication information or port selection indication information corresponds to N TRPs, and the terminal reports an SD basic vector corresponding to the N TRPs.

[0285] For example, the basis vector SD is used for explanation below. The basis vector SD is denoted as W ₁ , where or . W ₁ denotes a matrix consisting of L SD basis vectors corresponding to a set of port groups, N denotes the number of port groups, N _t denotes the number of transmit antenna ports, L denotes the number of SD basis vectors or the number of CSI-RS ports corresponding to CSI-RS resources, P denotes the number of CSI-RS ports, denotes a complex matrix with dimensions A denotes a complex matrix of dimensions NP × 2L.

[0286] (2) combination coefficient indicator information, and the combination coefficient indicator information corresponds to a plurality of CSI-RS resources.

[0287] According to one embodiment of the present disclosure, the CSI information sent by the terminal to the network device includes combination coefficient indicator information that is actually shared by a plurality of CSI-RS resources. This can also be understood as combination coefficient indicator information corresponding to a plurality of CSI-RS resources. In addition, each CSI-RS resource corresponds to one TRP, that is, N CSI-RS resources correspond to N TRPs, and the terminal reports combination coefficient indicator information shared by the plurality of TRPs.

[0288] For example, the indicator information of the combination coefficients is designated as , it is a matrix of combination coefficients, and N denotes the number of CSI-RS resources, L denotes the number of SD basis vectors or the number of CSI-RS ports corresponding to the CSI-RS resources, M denotes the number of FD basis vectors corresponding to the CSI-RS resources, and denotes a complex matrix with dimensions 2L × M.

[0289] In some cases, if the number of CSI-RS resources is 2, the number of SD basis vectors corresponding to each CSI-RS resource is 4, L _i is 4, and the number of FD basis vectors corresponding to at least two CSI-RS resources is 4, then M is 4, and

[0290] It should be noted that, as an example, an embodiment of the present disclosure is described using indicator information corresponding to one CSI-RS resource. According to another embodiment, the indicator information of the combination coefficients may also correspond to a plurality of port groups in one CSI-RS resource.

[0291] According to one embodiment of the present disclosure, the CSI information sent by the terminal to the network device includes combination coefficient indicator information that is actually shared by a plurality of port groups. It can also be understood as combination coefficient indicator information corresponding to a plurality of port groups. In addition, each port group corresponds to one TRP, that is, N port groups correspond to N TRPs, and the terminal reports combination coefficient indicator information shared by the plurality of TRPs.

[0292] For example, the combination coefficient indicator information is designated as it is a matrix of combination coefficients, where N denotes the number of port groups, L denotes the number of SD basis vectors or the number of CSI-RS ports corresponding to CSI-RS resources, and M denotes the number of FD basis vectors corresponding to port groups.

[0293] In some cases, if the number of port groups is 2, and the number of basis vectors SD corresponding to each port group is 4, L _i is 4, and the number of basis vectors FD corresponding to at least two port groups is 4, then M is 4, and

[0294] (3) the FD basis vector indicator information, and the FD basis vector indicator information corresponds to a plurality of CSI-RS resources.

[0295] The FD basis vector indicator information indicates M FD basis vectors selected by the terminal. According to one embodiment of the present disclosure, the CSI information sent by the terminal to the network device includes the FD basis vector indicator information that is actually shared by a plurality of CSI-RS resources. It can also be understood as the FD basis vector indicator information corresponding to a plurality of CSI-RS resources. In addition, each CSI-RS resource corresponds to one TRP, that is, N CSI-RS resources correspond to N TRPs, and the terminal reports the FD basis vector indicator information shared by the plurality of TRPs.

[0296] For example, the indicator information of the basis vector FD is denoted as W _f , it is a matrix of the basis vector FD, and N ₃ denotes the number of PMI sub-bands, M denotes the number of FD basis vectors corresponding to CSI-RS resources, and denotes a complex matrix with dimensions N ₃ × M.

[0297] In some cases, if the number of FD basis vectors corresponding to at least two CSI-RS resources is 4, then M is 4, and

[0298] It should be noted that, as an example, an embodiment of the present disclosure is described using the SD basic vector indicator information corresponding to one CSI-RS resource. According to another embodiment, the SD basic vector indicator information may also correspond to a plurality of port groups in one CSI-RS resource.

[0299] According to an embodiment of the present disclosure, the CSI information sent by the terminal to the network device includes FD basis vector indicator information that is actually shared by a plurality of port groups. It can also be understood as FD basis vector indicator information corresponding to a plurality of port groups. In addition, each port group corresponds to one TRP, that is, N port groups correspond to N TRPs, and the terminal reports FD basis vector indicator information shared by the plurality of TRPs.

[0300] For example, the reference information of the basis vector FD is denoted as W _f , it is a matrix of the basis vector FD, and N ₃ denotes the number of PMI sub-bands and M denotes the number of FD basis vectors corresponding to a port group, and denotes a complex matrix with dimensions N ₃ × M.

[0301] In some cases, if the number of FD basis vectors corresponding to at least two port groups is 4, then M is 4, and

[0302] It should also be noted that, as an example, an embodiment of the present disclosure is described using specific information indicated by the CSI information sent by the terminal to the network device. According to another embodiment, the network device needs to first configure the codebook parameter information for the terminal, and then the terminal sends the CSI information to the network device in accordance with the codebook parameter information.

[0303] The codebook parameter information configured by the network device for the terminal includes at least one of the following: a number of SD basis vectors corresponding to each CSI-RS resource, a number of FD basis vectors corresponding to the CSI-RS resource, a number of PMI subbands, or a number of transmit antenna ports. According to an alternative embodiment, the codebook parameter information configured by the network device for the terminal includes at least one of the following: a number of SD basis vectors corresponding to each port group, a number of FD basis vectors corresponding to the port group, a number of PMI subbands, or a number of transmit antenna ports.

[0304] According to some embodiments, after the network device configures codebook parameter information for the terminal, the terminal determines parameters specified by the CSI in accordance with the configured codebook parameter information, and then sends the CSI information to the network device.

[0305] It should be noted that, as an example, all three of the above situations are described using the combination coefficient indicator information. According to another embodiment, the combination coefficient indicator information includes a plurality of types of information.

[0306] In some cases, the combination coefficient indicator information includes information about a non-zero coefficient and information about a position of a non-zero coefficient, the non-zero coefficient information indicates a non-zero coefficient in the combination coefficient indicator information, and the non-zero coefficient position information indicates a position of a non-zero coefficient in the combination coefficient indicator information.

[0307] It should also be noted that, as an example, an embodiment of the present disclosure is described using specific information indicated by the CSI information sent by the terminal to the network device. According to another embodiment, the network device needs to first configure the codebook parameter information for the terminal, and then the terminal sends the CSI information to the network device in accordance with the codebook parameter information.

[0308] The codebook parameter information configured by the network device for the terminal includes at least one of the following: a number of SD basis vectors corresponding to each CSI-RS resource, a number of FD basis vectors corresponding to the CSI-RS resource, a number of PMI subbands, or a number of transmit antenna ports. According to an alternative embodiment, the codebook parameter information configured by the network device for the terminal includes at least one of the following: a number of SD basis vectors corresponding to each port group, a number of FD basis vectors corresponding to the port group, a number of PMI subbands, or a number of transmit antenna ports.

[0309] According to some embodiments, after the network device configures codebook parameter information for the terminal, the terminal determines parameters specified by the CSI in accordance with the configured codebook parameter information, and then sends the CSI information to the network device.

[0310] In a solution according to an embodiment of the present disclosure, the parameters indicated by the CSI information include a plurality of situations, which expands the properties of the said parameters and thus improves the diversity of the said parameters.

[0311] According to some embodiments, the terminal determines, in accordance with the channel information or the true channel information corresponding to each CSI-RS resource and the codebook parameter information, the indicator information of the SD basis vector or the indicator information for selecting a port, the indicator information of the combination coefficients, and the indicator information of the FD basis vector. Then, the terminal sends to the network device the CSI information including the indicator information of the SD basis vector or the indicator information for selecting a port, the indicator information of the combination coefficients, and the indicator information of the FD basis vector.

[0312] True channel information refers to channel information that can be used, and it can also be understood as channel information including true parameters.

[0313] According to one embodiment of the present disclosure, after measuring each CSI-RS resource, the terminal may determine channel information or true channel information corresponding to each CSI-RS resource, and the terminal may also determine indication information of the SD basis vector or indication information for selecting a port according to the determined channel information or true channel information and the codebook parameter information, and after the terminal determines the indication information of the SD basis vector or the indication information for selecting a port, the terminal may also determine indication information of the combination coefficients and indication information of the FD basis vector. Then, the terminal determines the CSI information. The CSI may contain the above three types of information determined by the terminal, and the CSI is then sent to the network device.

[0314] In a solution according to an embodiment of the present disclosure, after measuring the CSI-RS corresponding to each CSI-RS resource, the indication information reported to the network device includes information shared by a plurality of TRPs and individual parameters for each TRP, so that the network device can determine precoding of the terminal according to the parameters reported by the terminal, which not only reduces the overhead of reverse data transmission by reporting the shared parameters, but also improves the benefits of precoding of the terminal by integrating the parameters of the plurality of TRPs.

[0315] According to the embodiment shown in Fig. 6, the terminal receives configuration information from the network device, wherein the configuration information is used to set up codebook parameter information, and the codebook parameter information is used by the terminal to determine the CSI.

[0316] According to an embodiment of the present disclosure, a network device sends configuration information to a terminal and configures codebook parameter information for the terminal using the configuration information. Subsequently, the terminal can send CSI to the network device based on the codebook parameter information.

[0317] According to some embodiments, before the network device sends the configuration information to the terminal, the network device also first determines a codebook structure in order to configure the terminal with codebook parameter information corresponding to the codebook structure based on the codebook structure.

[0318] In some cases, the terminal determines the structure of the codebook and then indicates the determined structure of the codebook to the network device using the pointer information.

[0319] The terminal sends first indication information to the network device, wherein the first indication information indicates the received codebook structure.

[0320] In some cases, the network device determines the structure of the codebook and then indicates the structure of the codebook to the terminal using pointer information.

[0321] The terminal receives second indication information from the network device, wherein the second indication information indicates the received codebook structure.

[0322] It should be noted that, as an example, an embodiment of the present disclosure is described using indication information indicating a codebook structure. According to another embodiment, the codebook structure is negotiated between the network device and the terminal using a protocol, and the network device directly configures the terminal with codebook parameter information corresponding to the negotiated codebook structure.

[0323] In a solution according to an embodiment of the present disclosure, after the network device determines the structure of the codebook, the network device configures the parameter information of the codebook for the terminal in accordance with the structure of the codebook, which improves the accuracy of the parameter information of the codebook configured by the network device.

[0324] Fig. 7 shows a flow chart of a method for determining pre-coding based on a codebook according to an illustrative embodiment of the present disclosure, which can be illustratively applied to the network device shown in Fig. 1. The method includes at least part of the following content.

[0325] In step 701, the network device receives CSI information from the terminal, where the CSI includes indicator information corresponding to a plurality of CSI-RS resources and indicator information corresponding to each CSI-RS resource, or the CSI includes indicator information corresponding to a plurality of port groups in one CSI-RS resource and indicator information corresponding to each port group, the port group includes a plurality of CSI-RS ports corresponding to the CSI-RS resource, and the CSI is determined by the terminal based on channel information corresponding to each CSI-RS resource in at least one CSI-RS resource and codebook parameter information.

[0326] CSI-RS resources are used to transmit CSI-RS. In addition, CSI-RS resources are configured by a network device, and the network device can send CSI-RS to a terminal using the configured CSI-RS resources.

[0327] According to an embodiment of the present disclosure, a terminal measures a CSI-RS based on at least one CSI-RS resource to obtain channel information corresponding to each measured CSI-RS resource.

[0328] According to some embodiments, the CSI-RS resource is a Channel Measurement Resource (CMR). That is, according to some embodiments of the present disclosure, the CSI-RS resource is a CMR resource.

[0329] In some cases, different CMRs belong to the same CSI-RS resource set or to different CSI-RS resource sets.

[0330] According to some embodiments, each of the at least one CSI-RS resource corresponds to one TRP, and at least two TRPs are used for the CJT.

[0331] According to some other embodiments, each group of the plurality of port groups in one CSI-RS resource corresponds to one TRP, and at least two TRPs are configured for the CJT.

[0332] One CSI-RS resource corresponds to a plurality of CSI-RS ports, the plurality of CSI-RS ports are obtained by grouping the plurality of CSI-RS ports, each port group includes at least one CSI-RS port, and each port group corresponds to one TRP.

[0333] The codebook parameter information is used by the terminal to report the indication information so that the network device can determine the precoding of the terminal. In addition, the codebook parameter information corresponds to the codebook structure. In other words, the precoding of the terminal can be determined according to the codebook structure corresponding to the codebook parameter information and the CSI. In addition, the CSI information according to embodiments of the disclosure is used to determine the precoding of the terminal based on the codebook structure corresponding to the codebook parameter information, and the CSI includes the indication information. That is, the indication information included in the CSI is used to determine the precoding of the terminal based on the codebook structure corresponding to the codebook parameter information.

[0334] The CSI information includes indication information corresponding to a plurality of CSI-RS resources and indication information corresponding to each CSI-RS resource. The indication information corresponding to a plurality of CSI-RS resources means that the indication information included in the CSI for determining the precoding of the terminal can be applied to each CSI-RS resource. That is, the transmission of the indication information can be applied to each CSI-RS resource. The indication information corresponding to each CSI-RS resource means that the parameters included in the CSI for determining the precoding of the terminal are applied to one CSI-RS resource. That is, the indication information corresponding to each CSI-RS resource is applied to the corresponding CSI-RS resource, but is not applied to other CSI-RS resources.

[0335] According to an alternative embodiment, the CSI includes indication information corresponding to a plurality of port groups in one CSI-RS resource and indication information corresponding to each port group, and the port group includes a plurality of CSI-RS ports corresponding to the CSI-RS resource. The indication information corresponding to a plurality of port groups means that the indication information included in the CSI for determining the terminal precoding can be applied to each port group. That is, transmission of the indication information can be applied to each port group. The indication information corresponding to each port group means that the indication information included in the CSI for determining the terminal precoding is applied to one port group. That is, the parameters corresponding to each port group are applied to the corresponding port group, but are not applied to other port groups.

[0336] According to an embodiment of the present disclosure, after the terminal determines channel information corresponding to each CSI-RS resource in at least one CSI-RS resource, the terminal determines indicator information to be reported to the network device based on the obtained channel information and codebook parameter information. Then, the terminal sends the CSI including the indicator information to the network device, and the CSI is used to determine precoding parameters of the terminal.

[0337] If at least one CSI-RS resource includes a plurality of CSI-RS resources, the terminal determines channel information corresponding to each CSI-RS resource. If at least one CSI-RS resource includes one CSI-RS resource, and one CSI-RS resource corresponds to a plurality of CSI-RS ports, the terminal determines channel information corresponding to each port group in the plurality of port groups.

[0338] According to some embodiments, the network device configures codebook parameter information for the terminal using RRC signaling or other signaling.

[0339] At step 702, the network device determines a pre-coding of the terminal according to the CSI and a codebook structure corresponding to the codebook parameter information.

[0340] The parameter information of the codebook corresponds to the structure of the codebook. If the structure of the codebook is different, the network device determines the pre-coding of the terminal based on the structure of the codebook in various ways.

[0341] According to an embodiment of the present disclosure, after a network device receives a CSI, the network device may determine parameters shared by a plurality of CSI-RS resources and parameters corresponding to each CSI-RS resource based on the CSI indicated by the CSI, or determine parameters shared by a plurality of port groups in one CSI-RS resource and parameters corresponding to each port group indicated by the CSI, and determine precoding of the terminal according to the determined parameters and a codebook structure corresponding to the codebook parameter information.

[0342] In a solution according to an embodiment of the present disclosure, after the terminal measures the CSI-RS corresponding to each CSI-RS resource, the indication information reported to the network device includes parameters shared by the CSI-RS resources and parameters corresponding to each CSI-RS resource, or includes parameters shared by a plurality of port groups corresponding to one CSI-RS resource and parameters corresponding to each port group. The plurality of CSI-RS resources or the plurality of port groups can be understood as corresponding to a plurality of TRPs. That is, in the present disclosure, the parameters shared by a plurality of TRPs and individual parameters for each TRP are determined, so that the network device can determine precoding of the terminal according to the parameters reported by the terminal, which not only reduces the overhead of reverse data transmission by reporting the shared parameters, but also improves the benefits of precoding of the terminal by integrating the parameters of the plurality of TRPs.

[0343] According to the embodiment shown in Fig. 7, the CSI information sent by the terminal includes information elements, and the included information elements include various situations.

[0344] The first CSI information element includes at least one of the following information items (1)-(3).

[0345] (1) N pieces of SD basis vector indicator information or N pieces of port selection indicator information, where N is the same as the number of CSI-RS resources and N is a positive integer greater than 1.

[0346] The SD basis vector indicator information is represented by the SD basis vector. The SD basis vector indicator information indicates the SD basis vectors selected by the terminal, where i belongs to the set {1, 2…, N}. According to some embodiments, the SD basis vector indicator information is an SD beam basis vector, which may be called a beam basis vector, or an SD basis vector, or a beam. The port selection indicator information indicates the L ₁ CSI-RS ports selected by the terminal.

[0347] In addition, the CSI information sent by the terminal to the network device includes N pieces of SD basic vector indication information or N pieces of port selection indication information, which actually correspond to a number of CSI-RS resources. This can also be understood as a one-to-one correspondence between the pieces of SD basic vector indication information or the pieces of port selection indication information and the CSI-RS resources. In addition, each CSI-RS resource corresponds to one TRP, that is, N CSI-RS resources correspond to N TRPs, and the terminal reports a piece of SD basic vector indication information or a piece of port selection indication information corresponding to each TRP.

[0348] For example, the SD basis vector indicator information is used for explanation below. The SD basis vector indicated by the SD basis vector indicator information is denoted as moreover or is a matrix consisting of SD basis vectors corresponding to the i-th CSI-RS resource, N denotes the number of CSI-RS resources, N _t denotes the number of transmit antenna ports, L _i denotes the number of SD basis vectors or the number of CSI-RS ports corresponding to the i-th CSI-RS resource, , and P is the number of CSI-RS ports. is a complex matrix with dimensions X rows and Y columns, for example, X is N _t , and Y is 2L _i , that is, The complex matrix according to the following embodiments is similar in an embodiment of the present invention, which is not repeated further herein.

[0349] In some cases, if the number of CSI-RS resources is 2, the number of SD basis vectors corresponding to each CSI-RS resource is 4, and L _i is 4, then

[0350] It should be noted that, as an example, an embodiment of the present disclosure is described using N pieces of SD basic vector indicator information or N pieces of port selection indicator information corresponding to CSI-RS resources. According to another embodiment, N pieces of SD basic vector indicator information or N pieces of port selection indicator information may also correspond to a plurality of port groups in one CSI-RS resource.

[0351] The CSI information includes N pieces of SD basis vector indication information or N pieces of port selection indication information, and N is the same as the number of port groups, and N is a positive integer that is greater than 1.

[0352] The CSI information sent by the terminal to the network device includes N pieces of SD basic vector indication information or N pieces of port selection indication information, which actually correspond to the number of port groups. This can also be understood as a one-to-one correspondence between the pieces of SD basic vector indication information or the pieces of port selection indication information and the port groups. In addition, each port group corresponds to one TRP, that is, N port groups correspond to N TRPs, and the terminal reports a piece of SD basic vector indication information or a piece of port selection indication information corresponding to each TRP.

[0353] For example, the SD basis vector indicator information is used for explanation below. The SD basis vector indicated by the SD basis vector indicator information is denoted as moreover or is a matrix consisting of L _i SD basis vectors corresponding to the i-th port group, N denotes the number of at least two port groups, N _t denotes the number of transmit antenna ports, L _i denotes the number of SD basis vectors or the number of CSI-RS ports corresponding to the i-th port group, and P is the number of CSI-RS ports.

[0354] In some cases, if the number of port groups is 2, the number of SD basis vectors corresponding to each port group is 4, and L _i is 4, then

[0355] (2) combination coefficient indicator information, and the combination coefficient indicator information corresponds to a plurality of CSI-RS resources.

[0356] According to one embodiment of the present disclosure, the CSI information sent by the terminal to the network device includes combination coefficient indicator information that is actually shared by a plurality of CSI-RS resources. This can also be understood as combination coefficient indicator information corresponding to a plurality of CSI-RS resources. In addition, each CSI-RS resource corresponds to one TRP, that is, N CSI-RS resources correspond to N TRPs, and the terminal reports combination coefficient indicator information shared by the plurality of TRPs.

[0357] For example, the combination coefficient matrix indicated by the combination coefficient indicator information is denoted as moreover N denotes the number of CSI-RS resources, L _t denotes the number of parts of the SD basis vector pointer information or the number of CSI-RS ports corresponding to the i-th CSI-RS resource, , and M denotes the number of FD basis vectors corresponding to the CSI-RS resource.

[0358] In some cases, if the number of CSI-RS resources is 2, the number of SD basis vectors corresponding to each CSI-RS resource is 4, L _i is 4, and the number of FD basis vectors corresponding to at least two CSI-RS resources is 4, then M is 4, and

[0359] It should be noted that, as an example, an embodiment of the present disclosure is described using indicator information corresponding to one CSI-RS resource. According to another embodiment, the indicator information of the combination coefficients may also correspond to a plurality of port groups in one CSI-RS resource.

[0360] The CSI information includes combination coefficient indicator information, and the combination coefficient indicator information corresponds to a plurality of port groups.

[0361] According to one embodiment of the present disclosure, the CSI information sent by the terminal to the network device includes combination coefficient indicator information that is actually shared by a plurality of port groups. It can also be understood as combination coefficient indicator information corresponding to a plurality of port groups. In addition, each port group corresponds to one TRP, that is, N port groups correspond to N TRPs, and the terminal reports combination coefficient indicator information shared by the plurality of TRPs.

[0362] For example, the combination coefficient matrix indicated by the combination coefficient indicator information is denoted as , and N denotes the number of port groups, L _i denotes the number of SD basis vectors or the number of CSI-RS ports corresponding to the i-th port group, and M denotes the number of FD basis vectors corresponding to a port group.

[0363] In some cases, if the number of port groups is 2, and the number of basis vectors SD corresponding to each port group is 4, L _i is 4, and the number of basis vectors FD corresponding to at least two port groups is 4, then M is 4, and

[0363] (3) the FD basis vector indicator information, and the FD basis vector indicator information corresponds to a plurality of CSI-RS resources.

[0365] The FD basis vector indicator information indicates M FD basis vectors selected by the terminal. The FD basis vector indicator information is used to represent a channel change rule in the FD. In particular, the FD basis vectors may be used to represent a rule for changing the weight of each SD basis vector in each FD block. The change rule represented by the FD basis is related to factors such as multipath delay.

[0366] According to one embodiment of the present disclosure, the CSI information sent by the terminal to the network device includes FD basis vector indicator information that is actually shared by a plurality of CSI-RS resources. This can also be understood as FD basis vector indicator information corresponding to a plurality of CSI-RS resources. In addition, each CSI-RS resource corresponds to one TRP, that is, N CSI-RS resources correspond to N TRPs, and the terminal reports the FD basis vector indicator information shared by the plurality of TRPs.

[0367] For example, the FD basis vector specified in the FD basis vector designation information is denoted as it is a FD basis vector matrix, where N ₃ denotes the number of PMI sub-bands, and M denotes the number of FD basis vectors corresponding to a port group.

[0368] In some cases, if the number of FD basis vectors corresponding to at least two CSI-RS resources is 4, then M is 4, and

[0369] It should be noted that, as an example, an embodiment of the present disclosure is described using the FD basic vector indicator information corresponding to one CSI-RS resource. According to another embodiment, the FD basic vector indicator information may also correspond to a plurality of port groups in one CSI-RS resource.

[0370] The CSI information includes FD basis vector indicator information, and the FD basis vector indicator information corresponds to a plurality of port groups.

[0371] According to an embodiment of the present disclosure, the CSI information sent by the terminal to the network device includes FD basis vector indicator information that is actually shared by a plurality of port groups. It can also be understood as FD basis vector indicator information corresponding to a plurality of port groups. In addition, each port group corresponds to one TRP, that is, N port groups correspond to N TRPs, and the terminal reports FD basis vector indicator information shared by the plurality of TRPs.

[0372] For example, the FD basis vector specified in the FD basis vector indicator information is denoted as it is the matrix of the basis vector FD, , N ₃ denotes the number of PMI sub-bands, and M denotes the number of FD basis vectors corresponding to a port group.

[0373] In some cases, if the number of FD basis vectors corresponding to at least two port groups is 4, then M is 4, and

[0374] It should be noted that the SD basis vector indicator information, the combination coefficient indicator information, and the FD basis vector indicator information indicated by the CSI information according to the embodiments of the present disclosure simultaneously correspond to CSI-RS resources or port groups.

[0375] In addition, it should be noted that, as an example, an embodiment of the present disclosure is described using specific information indicated by the CSI sent by the terminal to the network device. According to another embodiment, the network device needs to first configure the codebook parameter information for the terminal, and then the terminal sends the CSI information to the network device in accordance with the codebook parameter information.

[0376] The codebook parameter information configured by the network device for the terminal includes at least one of the following: a number of SD basis vectors corresponding to each CSI-RS resource, a number of FD basis vectors corresponding to the CSI-RS resource, a number of PMI subbands, or a number of transmit antenna ports. According to an alternative embodiment, the codebook parameter information configured by the network device for the terminal includes at least one of the following: a number of SD basis vectors corresponding to each port group, a number of FD basis vectors corresponding to the port group, a number of PMI subbands, or a number of transmit antenna ports.

[0377] According to some embodiments, after the network device configures codebook parameter information for the terminal, the terminal determines parameters specified by the CSI in accordance with the configured codebook parameter information, and then sends the CSI information to the network device.

[0378] It should be noted that in the first situation the structure of the code book is expressed by the following formulas:

[0379] here W denotes the structure of the codebook, N denotes the number of CSI-RS resources, N _t denotes the number of transmit antenna ports, P denotes the number of CSI-RS ports, P denotes the number of SD basis vectors or the number of CSI-RS ports corresponding to the i-th CSI-RS resource, M denotes the number of FD basis vectors corresponding to the i-th CSI-RS resource or the number of FD basis vectors corresponding to the i-th port group, N ₃ denotes the number of PMI sub-bands, denotes a matrix consisting of L _i SD basis vectors or unit basis vectors for selecting the port corresponding to the i-th CSI-RS resource, denotes the matrix consisting of the index information of the combination coefficients, W _f denotes the matrix consisting of M basis vectors FD, and denotes a complex matrix with dimensions X rows and Y columns.

[0380] According to an alternative embodiment, here W denotes the structure of the codebook, N denotes the number of port groups, N _t denotes the number of transmit antenna ports, P denotes the number of CSI-RS ports, L _i denotes the number of SD basis vectors or the number of CSI-RS ports corresponding to the i-th port group, , M denotes the number of FD basis vectors corresponding to the i-th group of ports, N ₃ denotes the number of PMI subranges, denotes a matrix consisting of L _i SD basis vectors or unit basis vectors for selecting the port corresponding to the i-th port group, denotes a matrix consisting of the indicator information of the combination coefficients, denotes a matrix consisting of M basis vectors FD, and denotes a complex matrix with dimensions X rows and Y columns.

[0381] According to some embodiments, if is absent, then M=1. The terminal selects ports L ₁ =2, L ₂ =4 and L ₃ =8 respectively according to the estimated true information of each port and calculates, based on the selected ports, the coefficients of the port combination in the form The network device defines the calculation formula for pre-coding the terminal

. The user equipment UE reports the indication information and accordingly the information of each quantization coefficient in so that the network device uses them to calculate the terminal pre-coding.

[0382] In the second type of information, a plurality of CSI-RS resources are grouped to obtain G CSI-RS resource groups, and the CSI contains information corresponding to each of the G CSI-RS resource groups. The value of G coincides with the number of CSI-RS resource groups in the plurality of CSI-RS resources, the CSI-RS resource group includes at least one CSI-RS resource, and G is a positive integer that is greater than 1. According to an alternative embodiment, a plurality of port groups are grouped to obtain G first groups, and the CSI contains information corresponding to each of the G first groups. The value of G coincides with the number of first groups among the plurality of port groups, the first group includes at least one port group, and G is a positive integer that is greater than 1.

[0383] The CSI information comprises at least one of the following information elements:

[0384] (1) G pieces of designation information of the SD basis vector or G pieces of designation information for selecting a port (1)-(3).

[0385] The SD basis vector indicator information is represented by the SD basis vector. The SD basis vector indicator information indicates L _g SD basis vectors selected by the terminal, where L _g denotes the number of SD basis vectors corresponding to the g-th CSI-RS resource group, L _g represents the number and value of the SD basis vectors corresponding to each CSI-RS resource in the g-th CSI-RS resource group. According to an alternative embodiment, the port selection indicator information indicates L _g CSI-RS ports selected by the terminal, where L _g denotes the number of CSI-RS ports corresponding to the g-th first group, L _g represents the number and value of CSI-RS ports corresponding to each port group in the g-th first group.

[0386] In addition, the CSI information sent by the terminal to the network device includes G pieces of SD basic vector indication information or G pieces of port selection indication information, which actually correspond to the number G of CSI-RS resource groups. This can also be understood as a one-to-one correspondence between the pieces of SD basic vector indication information or the pieces of port selection indication information and the CSI-RS resource groups. In addition, each CSI-RS resource group includes at least one CSI-RS resource, and each CSI-RS resource corresponds to one TRP, that is, the terminal reports a piece of SD basic vector indication information or a piece of port selection indication information corresponding to the CSI-RS resource in each CSI-RS resource group.

[0387] For example, the SD basis vector is used for explanation below. The SD basis vector is denoted as , Where . denotes a matrix consisting of one or more SD basis vectors corresponding to the g-th CSI-RS resource group, N _g denotes the number of CSI-RS resources or the number of port groups in the g-th group, N _t denotes the number of transmit antenna ports, L _g denotes the number of SD basis vectors or the number of CSI-RS ports selected for the g-th group, and denotes a complex matrix with dimensions

[0388] In some cases, an embodiment of the present disclosure includes 4 CSI-RS resources, wherein CSI-RS resource 1 and CSI-RS resource 2 are the first group of CSI-RS resources, CSI-RS resource 3 and CSI-RS resource 4 are the second group of CSI-RS resources, and CSI-RS resource 1, CSI-RS resource 2, CSI-RS resource 3 and CSI-RS resource 4 correspond to points TRP1, TRP2, TRP3 and TRP4, respectively, which can also be understood in such a way that TRP1 and TRP2 are the first group of CSI-RS resources, TRP3 and TRP4 are the second group of CSI-RS resources. The number of basis vectors SD is L ₁ = L ₂ = 4, L ₃ = L ₄ = 3, then And denotes a complex matrix with dimensions A denotes a complex matrix of dimensions 2N _t × 12.

[0389] It should be noted that, as an example, an embodiment of the present disclosure is described using grouping of CSI-RS resources to obtain G groups of CSI-RS resources. According to another embodiment, the G first groups can be obtained by grouping a plurality of port groups into one CSI-RS resource.

[0390] In addition, the CSI information sent by the terminal to the network device contains G pieces of indication information of the SD basic vector or G pieces of indication information for selecting a port, which actually correspond to the number G of first groups. This can also be understood as a one-to-one correspondence between the pieces of indication information of the SD basic vector or the pieces of indication information for selecting a port and the first groups. In addition, each first group includes at least one port group, and each port group corresponds to one TRP, that is, the terminal reports a piece of indication information of the SD basic vector or a piece of indication information for selecting a port corresponding to a port group in each first group.

[0391] For example, the SD basis vector is used for explanation below. The SD basis vector is denoted as , Where denotes the matrix consisting of the SD basis vectors corresponding to the g-th first group, N _g denotes the number of CSI-RS resources or the number of port groups in the g-th group, N _t denotes the number of transmit antenna ports, L _g denotes the number of SD basis vectors or the number of CSI-RS ports selected for the g-th group, and denotes a complex matrix with dimensions .

[0392] In some cases, an embodiment of the present disclosure includes 4 port groups, where port group 1 and port group 2 are the 1st first group, port group 3 and port group 4 are the 2nd first group, and port group 1, port group 2, port group 3 and port group 4 correspond to points TRP1, TRP2, TRP3 and TRP4, respectively, which can also be understood in such a way that points TRP1 and TRP2 are the 1st first group, points TRP3 and TRP4 are the 2nd first group. The number of basis vectors SD is L ₁ = L ₂ = 4, L ₃ = L4 = 3, then denotes a complex matrix with dimensions , A denotes a complex matrix of dimensions 2N _t × 12.

[0393] (2) G parts of the combination coefficient indicator information.

[0394] According to one embodiment of the present disclosure, the CSI information sent by the terminal to the network device includes G pieces of combination coefficient indicator information, which actually correspond to the number G of CSI-RS resource groups. This can also be understood as a one-to-one correspondence between the pieces of combination coefficient indicator information and the CSI-RS resource groups. In addition, each CSI-RS resource group includes at least one CSI-RS resource, and each CSI-RS resource corresponds to one TRP, that is, the terminal reports a piece of combination coefficient indicator information corresponding to a CSI-RS resource in each CSI-RS resource group.

[0395] For example, the indicator information of the combination coefficients is designated as , it is a matrix of combination coefficients. N _g denotes the number of CSI-RS resources in the g-th group, L _g denotes the number of CSI-RS ports selected for the g-th group, M _g denotes the number of FD basis vectors selected for the g-th group, and denotes a complex matrix with dimensions 2L _g × M _g .

[0396] In some cases, an embodiment of the present disclosure includes 4 CSI-RS resources, wherein CSI-RS resource 1 and CSI-RS resource 2 are the first group of CSI-RS resources, CSI-RS resource 3 and CSI-RS resource 4 are the second group of CSI-RS resources, and CSI-RS resource 1, CSI-RS resource 2, CSI-RS resource 3 and CSI-RS resource 4 correspond to points TRP1, TRP2, TRP3 and TRP4, respectively, which can also be understood in such a way that TRP1 and TRP2 are the first group of CSI-RS resources, TRP3 and TRP4 are the second group of CSI-RS resources. The number of basis vectors SD is L ₁ = L ₂ = 4, L ₃ = L ₄ = 3. The number of basis vectors FD corresponding to one of the two groups is M ₁ = 4, the number of basis vectors FD corresponding to the other of the two groups is M ₂ = 7, , Here

[0397] It should be noted that, as an example, an embodiment of the present disclosure is described using grouping of CSI-RS resources to obtain G groups of CSI-RS resources. According to another embodiment, the G first groups can be obtained by grouping a plurality of port groups into one CSI-RS resource.

[0398] According to one embodiment of the present disclosure, the CSI information sent by the terminal to the network device includes G pieces of combination coefficient indicator information, which actually correspond to the number G of first groups. This can also be understood as a one-to-one correspondence between the pieces of combination coefficient indicator information and the first groups. In addition, each first group includes at least one port group, and each port group corresponds to one TRP, that is, the terminal reports combination coefficient indicator information corresponding to a port group in each first group.

[0399] For example, the indicator information of the combination coefficients is designated as it is a matrix of combination coefficients. denotes the number of port groups in the g-th group, denotes the number of CSI-RS ports selected for the g-th group, denotes the number of FD basis vectors selected for the g-th group, and denotes a complex matrix with dimensions 2Lg × M _g .

[0400] In some cases, an embodiment of the present disclosure includes 4 port groups, where port group 1 and port group 2 are the 1st first group, port group 3 and port group 4 are the 2nd first group, and port group 1, port group 2, port group 3 and port group 4 correspond to points TRP1, TRP2, TRP3 and TRP4, respectively, which can also be understood in such a way that points TRP1 and TRP2 are the 1st first group, points TRP3 and TRP4 are the 2nd first group. The number of basis vectors SD is L ₁ = L ₂ = 4, L ₃ = L ₄ = 3. The number of basis vectors FD corresponding to one of the two groups is M ₁ = 4, the number of basis vectors FD corresponding to the other of the two groups is M ₂ = 7, Here

[0401] (3) G parts of the reference information of the basis vector FD.

[0402] According to one embodiment of the present disclosure, the CSI information sent by the terminal to the network device includes G pieces of FD reference vector information, which actually correspond to the number G of CSI-RS resource groups. This can also be understood as a one-to-one correspondence between the pieces of FD reference vector information and the CSI-RS resource groups. In addition, each CSI-RS resource group includes at least one CSI-RS resource, and each CSI-RS resource corresponds to one TRP, that is, the terminal reports the FD reference vector corresponding to the CSI-RS resource in each CSI-RS resource group.

[0403] For example, the basis vector FD is denoted as , it is the matrix of the basis vector FD. In N denotes the number of CSI-RS resources, denotes the number of FD basis vectors selected for the g-th group, H denotes the Hermitian conjugation operation of the matrix, and denotes a complex matrix of dimensions N ₃ × M _g .

[0404] In some cases, an embodiment of the present disclosure includes 4 CSI-RS resources, wherein CSI-RS resource 1 and CSI-RS resource 2 are the first group of CSI-RS resources, CSI-RS resource 3 and CSI-RS resource 4 are the second group of CSI-RS resources, and CSI-RS resource 1, CSI-RS resource 2, CSI-RS resource 3 and CSI-RS resource 4 correspond to points TRP1, TRP2, TRP3 and TRP4, respectively, which can also be understood in such a way that TRP1 and TRP2 are the first group of CSI-RS resources, TRP3 and TRP4 are the second group of CSI-RS resources. The number of basis vectors SD is L ₁ = L ₂ = 4, L ₃ = L ₄ = 3. The number of basis vectors FD corresponding to one of the two groups is M ₁ = 4, the number of basis vectors FD corresponding to the other of the two groups is M ₂ = 7, Here

[0405] It should be noted that, as an example, an embodiment of the present disclosure is described using grouping of CSI-RS resources to obtain G groups of CSI-RS resources. According to another embodiment, the G first groups can be obtained by grouping a plurality of port groups into one CSI-RS resource.

[0406] According to an embodiment of the present disclosure, the CSI information sent by the terminal to the network device includes G FD basis vectors. G parts of the FD basis vector indication information actually correspond to the number G of first groups, which can also be understood as a one-to-one correspondence between the parts of the FD basis vector indication information and the first groups. In addition, each first group includes at least one port group, and each port group corresponds to one TRP, that is, the terminal reports the FD basis vector corresponding to the port group in each first group.

[0407] For example, the basis vector FD is denoted as it is the matrix of the basis vector FD. H denotes the Hermitian conjugation operation of the matrix, N _g denotes the number of CSI-RS resources or the number of port groups in the g-th group, H denotes the Hermitian conjugation operation of the matrix, N ₃ denotes the number of PMI subbands, M _g denotes the number of FD basis vectors selected for the g-th group, and denotes a complex matrix of dimensions N ₃ × M _g .

[0408] In some cases, an embodiment of the present disclosure includes 4 port groups, where port group 1 and port group 2 are the 1st first group, port group 3 and port group 4 are the 2nd first group, and port group 1, port group 2, port group 3 and port group 4 correspond to points TRP1, TRP2, TRP3 and TRP4, respectively, which can also be understood in such a way that points TRP1 and TRP2 are the 1st first group, points TRP3 and TRP4 are the 2nd first group. The number of basis vectors SD is L ₁ = L ₂ = 4, L ₃ = L ₄ = 3. The number of basis vectors FD corresponding to one of the two groups is M ₁ = 4, the number of basis vectors FD corresponding to the other of the two groups is M ₂ = 7, Here

[0409] It should be noted that the SD basis vector indicator information, the combination coefficient indicator information, and the FD basis vector indicator information indicated by the CSI information according to an embodiment of the present disclosure simultaneously correspond to a CSI-RS resource group or the first group in a port group.

[0410] It should also be noted that, as an example, an embodiment of the present disclosure is described using specific information indicated by the CSI information sent by the terminal to the network device. According to another embodiment, the network device needs to first configure the codebook parameter information for the terminal, and then the terminal sends the CSI information to the network device in accordance with the codebook parameter information.

[0411] The codebook parameter information configured by the network device for the terminal includes at least one of the following: a number of SD basis vectors corresponding to each CSI-RS resource, a number of FD basis vectors corresponding to the CSI-RS resource, a number of PMI subbands, or a number of transmit antenna ports. According to an alternative embodiment, the codebook parameter information configured by the network device for the terminal includes at least one of the following: a number of SD basis vectors corresponding to each port group, a number of FD basis vectors corresponding to the port group, a number of PMI subbands, or a number of transmit antenna ports.

[0412] According to some embodiments, after the network device configures codebook parameter information for the terminal, the terminal determines parameters specified by the CSI in accordance with the configured codebook parameter information, and then sends the CSI information to the network device.

[0413] It should be noted that in the second situation the structure of the code book is expressed by the following formulas:

[0414] where W denotes the codebook structure, W _1,g denotes a matrix consisting of SD basis vectors or unit basis vectors for selecting a port corresponding to the CSI-RS resources in the g-th group, N _g denotes the number of CSI-RS resources in the g-th group, N _t denotes the number of transmit antenna ports, W _{f ,g} denotes a matrix consisting of M _g FD basis vectors corresponding to the CSI-RS resource in the g-th group, M _g denotes the number of FD basis vectors selected for the g-th group, denotes a matrix consisting of combination coefficients corresponding to the CSI-RS resources in the g-th group, L _g denotes the number of SD basis vectors or the number of CSI-RS ports selected for the g-th group, G denotes the same as the number of CSI-RS resource groups in the CSI-RS resource set, G is a positive integer greater than 1, H denotes the Hermitian conjugation operation of the matrix, N ₃ denotes the number of PMI subbands, denotes a complex matrix with dimensions X rows and Y columns.

[0415] According to an alternative version, here W denotes the structure of the codebook, denotes a matrix consisting of SD basis vectors or unit basis vectors for selecting a port corresponding to the port groups in the g-th group, N _g denotes the number of port groups in the g-th group, N _t denotes the number of transmit antenna ports, denotes a matrix consisting of M _g FD basis vectors corresponding to the groups of ports in the g-th group, M _g denotes the number of FD basis vectors selected for the g-th group, denotes the matrix consisting of the combination coefficients corresponding to the port groups in the g-th group, L _g denotes the number of SD basis vectors or the number of CSI-RS ports selected for the g-th group, G denotes the same as the number of first groups among the port groups, G is a positive integer greater than 1, H denotes the Hermitian conjugation operation of the matrix, N ₃ denotes the number of PMI subbands, and denotes a complex matrix with dimensions X rows and Y columns.

[0416] In the third type of information, the CSI information includes at least one of the following information elements (1)-(3).

[0417] (1) the SD basic vector indicator information or the port selection indicator information, and the SD basic vector indicator information or the port selection indicator information corresponds to a plurality of CSI-RS resources.

[0418] The SD basis vector indicator information is represented by the SD basis vector. The SD basis vector indicator information indicates basis vectors SD selected by the terminal. The indication information for port selection indicates CSI-RS ports selected by the terminal, where N denotes the number of CSI-RS resources or the number of port groups, and N _t denotes the number of transmit antenna ports.

[0419] In addition, the CSI information sent by the terminal to the network device includes SD basic vector indication information or port selection indication information that actually correspond to a number of CSI-RS resources. It can also be understood as SD basic vector indication information or port selection indication information applied to multiple CSI-RS resources. In addition, each CSI-RS resource corresponds to one TRP, that is, SD basic vector indication information or port selection indication information corresponds to N TRPs, and the terminal reports SD basic vector indication information or port selection indication information corresponding to the N TRPs.

[0420] For example, the SD basis vector is used for explanation below. The SD basis vector is denoted as , Where denotes a matrix consisting of L SD basis vectors corresponding to a set of CSI-RS resources, N denotes the number of CSI-RS resources, N ₃ denotes the number of transmit antenna ports, L denotes the number of SD basis vectors or the number of CSI-RS ports corresponding to CSI-RS resources, P denotes the number of CSI-RS ports, denotes a complex matrix with dimensions A denotes a complex matrix of dimensions NP × 2L.

[0421] It should be noted that, as an example, an embodiment of the present disclosure is described using the SD basic vector indicator information or the port selection indicator information corresponding to the CSI-RS resources. According to another embodiment, the SD basic vector indicator information or the port selection indicator information may also correspond to a plurality of port groups in one CSI-RS resource.

[0422] The CSI information includes SD basis vector indicator information or port selection indicator information, and the SD basis vector indicator information or port selection indicator information corresponds to a plurality of port groups.

[0423] In addition, the CSI information sent by the terminal to the network device includes SD basic vector indication information or port selection indication information, which actually corresponds to a number of port groups. It can also be understood as SD basic vector indication information or port selection indication information applied to a plurality of port groups. In addition, each port group corresponds to one TRP, that is, SD basic vector indication information or port selection indication information corresponds to N TRPs, and the terminal reports an SD basic vector corresponding to the N TRPs.

[0424] For example, the SD basis vector is used for explanation below. The SD basis vector is denoted as , Where denotes a matrix consisting of L SD basis vectors corresponding to a set of port groups, N denotes the number of port groups, N _t denotes the number of transmit antenna ports, L denotes the number of SD basis vectors or the number of CSI-RS ports corresponding to CSI-RS resources, P denotes the number of CSI-RS ports, denotes a complex matrix with dimensions A denotes a complex matrix of dimensions NP × 2L.

[0425] (2) combination coefficient indicator information, and the combination coefficient indicator information corresponds to a plurality of CSI-RS resources.

[0426] According to one embodiment of the present disclosure, the CSI information sent by the terminal to the network device includes combination coefficient indicator information that is actually shared by a plurality of CSI-RS resources. This can also be understood as combination coefficient indicator information corresponding to a plurality of CSI-RS resources. In addition, each CSI-RS resource corresponds to one TRP, that is, N CSI-RS resources correspond to N TRPs, and the terminal reports combination coefficient indicator information shared by the plurality of TRPs.

[0427] For example, the indicator information of the combination coefficients is designated as , it is a matrix of combination coefficients, and N denotes the number of CSI-RS resources, L denotes the number of SD basis vectors or the number of CSI-RS ports corresponding to the CSI-RS resources, M denotes the number of FD basis vectors corresponding to the CSI-RS resources, and denotes a complex matrix with dimensions 2L × M.

[0428] In some cases, if the number of CSI-RS resources is 2, the number of SD basis vectors corresponding to each CSI-RS resource is 4, is 4, and the number of FD basis vectors corresponding to at least two CSI-RS resources is 4, then M is 4, and

[0429] It should be noted that, as an example, an embodiment of the present disclosure is described using indicator information corresponding to one CSI-RS resource. According to another embodiment, the indicator information of the combination coefficients may also correspond to a plurality of port groups in one CSI-RS resource.

[0430] According to one embodiment of the present disclosure, the CSI information sent by the terminal to the network device includes combination coefficient indicator information that is actually shared by a plurality of port groups. It can also be understood as combination coefficient indicator information corresponding to a plurality of port groups. In addition, each port group corresponds to one TRP, that is, N port groups correspond to N TRPs, and the terminal reports combination coefficient indicator information shared by the plurality of TRPs.

[0431] For example, the combination coefficient indicator information is designated as it is a matrix of combination coefficients, where N denotes the number of port groups, L denotes the number of SD basis vectors or the number of CSI-RS ports corresponding to CSI-RS resources, and M denotes the number of FD basis vectors corresponding to port groups.

[0432] In some cases, if the number of port groups is 2, and the number of basis vectors SD corresponding to each port group is 4, L _i is 4, and the number of basis vectors FD corresponding to at least two port groups is 4, then M is 4, and

[0433] (3) the FD basis vector indicator information, and the FD basis vector indicator information corresponds to a plurality of CSI-RS resources.

[0434] The FD basis vector indicator information indicates M FD basis vectors selected by the terminal. According to one embodiment of the present disclosure, the CSI information sent by the terminal to the network device includes the FD basis vector indicator information that is actually shared by a plurality of CSI-RS resources. It can also be understood as the FD basis vector indicator information corresponding to a plurality of CSI-RS resources. In addition, each CSI-RS resource corresponds to one TRP, that is, N CSI-RS resources correspond to N TRPs, and the terminal reports the FD basis vector indicator information shared by the plurality of TRPs.

[0435] For example, the indicator information of the basis vector FD is denoted as W _f , it is a matrix of the basis vector FD, and . N ₃ denotes the number of PMI sub-bands, M denotes the number of FD basis vectors corresponding to CSI-RS resources, and denotes a complex matrix with dimensions N ₃ × M.

[0436] In some cases, if the number of FD basis vectors corresponding to at least two CSI-RS resources is 4, then M is 4, and

[0437] It should be noted that, as an example, an embodiment of the present disclosure is described using the SD basic vector indicator information corresponding to one CSI-RS resource. According to another embodiment, the SD basic vector indicator information may also correspond to a plurality of port groups in one CSI-RS resource.

[0438] According to an embodiment of the present disclosure, the CSI information sent by the terminal to the network device includes FD basis vector indicator information that is actually shared by a plurality of port groups. It can also be understood as FD basis vector indicator information corresponding to a plurality of port groups. In addition, each port group corresponds to one TRP, that is, N port groups correspond to N TRPs, and the terminal reports FD basis vector indicator information shared by the plurality of TRPs.

[0439] For example, the index information of the basis vector FD is denoted as W _f , it is a matrix of the basis vector FD, and N ₃ denotes the number of PMI sub-bands and M denotes the number of FD basis vectors corresponding to a port group, and denotes a complex matrix with dimensions N ₃ × M.

[0440] In some cases, if the number of FD basis vectors corresponding to at least two port groups is 4, then M is 4, and

[0441] It should also be noted that, as an example, an embodiment of the present disclosure is described using specific information indicated by the CSI information sent by the terminal to the network device. According to another embodiment, the network device needs to first configure the codebook parameter information for the terminal, and then the terminal sends the CSI information to the network device in accordance with the codebook parameter information.

[0442] The codebook parameter information configured by the network device for the terminal includes at least one of the following: a number of SD basis vectors corresponding to each CSI-RS resource, a number of FD basis vectors corresponding to the CSI-RS resource, a number of PMI subbands, or a number of transmit antenna ports. According to an alternative embodiment, the codebook parameter information configured by the network device for the terminal includes at least one of the following: a number of SD basis vectors corresponding to each port group, a number of FD basis vectors corresponding to the port group, a number of PMI subbands, or a number of transmit antenna ports.

[0443] According to some embodiments, after the network device configures codebook parameter information for the terminal, the terminal determines parameters specified by the CSI in accordance with the configured codebook parameter information, and then sends the CSI information to the network device.

[0444] It should be noted that in the third situation the structure of the code book is expressed by the following formulas:

[0445] here W denotes the codebook structure, N denotes the number of CSI-RS resources, N _t denotes the number of transmit antenna ports, L denotes the number of SD basis vectors or CSI-RS ports corresponding to the CSI-RS resources, M denotes the number of FD basis vectors corresponding to the CSI-RS resources, N ₃ denotes the number of PMI subbands, W ₁ denotes a matrix consisting of L SD basis vectors or unit basis vectors for selecting a port for the CSI-RS resources, denotes a matrix consisting of the index information of the combination coefficients, W _f denotes a matrix consisting of M frequency domain basis vectors, H denotes the Hermitian conjugation operation of the matrix, and denotes a complex matrix with dimensions X rows and Y columns.

[0446] It should be noted that, as an example, all three of the above situations are described using the combination coefficient indicator information. According to another embodiment, the combination coefficient indicator information includes a plurality of types of information.

[0447] In some cases, the combination coefficient indicator information includes information about a non-zero coefficient and information about the position of the non-zero coefficient, the non-zero coefficient information indicates a non-zero coefficient in the combination coefficient indicator information, and the non-zero coefficient position information indicates a position of the non-zero coefficient in the combination coefficient indicator information.

[0448] According to some embodiments, the device receives CSI information from the terminal, wherein the CSI includes SD basis vector indicator information or port selection indicator information, combination coefficient indicator information, and FD basis vector indicator information.

[0449] The designation information of the SD basis vector or the designation information for selecting a port, the designation information of the combination coefficients, and the designation information of the FD basis vector are determined by the terminal in accordance with the channel information or the true channel information corresponding to each CSI-RS resource and the codebook parameter information.

[0450] It should also be noted that, as an example, an embodiment of the present disclosure is described using specific information indicated by the CSI information sent by the terminal to the network device. According to another embodiment, the network device needs to first configure the codebook parameter information for the terminal, and then the terminal sends the CSI information to the network device in accordance with the codebook parameter information.

[0451] The codebook parameter information configured by the network device for the terminal includes at least one of the following: a number of SD basis vectors corresponding to each CSI-RS resource, a number of FD basis vectors corresponding to the CSI-RS resource, a number of PMI subbands, or a number of transmit antenna ports. According to an alternative embodiment, the codebook parameter information configured by the network device for the terminal includes at least one of the following: a number of SD basis vectors corresponding to each port group, a number of FD basis vectors corresponding to the port group, a number of PMI subbands, or a number of transmit antenna ports.

[0452] According to some embodiments, after the network device configures codebook parameter information for the terminal, the terminal determines parameters specified by the CSI in accordance with the configured codebook parameter information and then sends the CSI information to the network device.

[0453] In a solution according to an embodiment of the present disclosure, the parameters indicated by the CSI information include a plurality of situations, which expands the properties of the said parameters and thus improves the diversity of the said parameters.

[0454] According to the embodiment shown in Fig. 7, the network device configures the codebook parameters for the terminal using configuration information. The network device sends the configuration information to the terminal. The configuration information is used to configure the codebook parameter information, and the codebook parameter information is used by the terminal to determine CSI information.

[0455] According to an embodiment of the present disclosure, a network device sends configuration information to a terminal and configures codebook parameter information for the terminal using the configuration information. Subsequently, the terminal can send CSI to the network device based on the codebook parameter information.

[0456] According to some embodiments, before the network device sends the configuration information to the terminal, the network device also first determines a codebook structure in order to configure the terminal with codebook parameter information corresponding to the codebook structure based on the codebook structure.

[0457] In some cases, the terminal determines the structure of the codebook and then indicates the determined structure of the codebook to the network device using the pointer information.

[0458] The terminal sends first indication information to the network device, wherein the first indication information indicates the received codebook structure.

[0459] In some cases, the network device determines the structure of the codebook and then indicates the structure of the codebook to the terminal using pointer information.

[0460] The terminal receives second indication information from the network device, wherein the second indication information indicates the received codebook structure.

[0461] It should be noted that, as an example, an embodiment of the present disclosure is described using indication information indicating a codebook structure. According to another embodiment, the codebook structure is negotiated between the network device and the terminal using a protocol, and the network device directly configures the terminal with codebook parameter information corresponding to the negotiated codebook structure.

[0462] In a solution according to an embodiment of the present disclosure, after the network device determines the structure of the codebook, the network device configures the parameter information of the codebook for the terminal in accordance with the structure of the codebook, which improves the accuracy of the parameter information of the codebook configured by the network device.

[0463] Fig. 8 shows a block diagram of an apparatus for determining precoding based on a codebook according to an explanatory (illustrative) embodiment of the present disclosure. As shown in Fig. 8, the apparatus includes a determining module 801 and a transmitting module 802.

[0464] The determining module 801 is configured to determine channel information corresponding to each CSI-RS resource based on at least one CSI-RS resource.

[0465] The transmitting module 802 is configured to send CSI to the network device according to the channel information determined according to each CSI-RS resource and the codebook parameter information. The CSI information includes indicator information corresponding to a plurality of CSI-RS resources and indicator information corresponding to each CSI-RS resource, or the CSI includes indicator information corresponding to a plurality of port groups in one CSI-RS resource and indicator information corresponding to each port group, the port group includes a plurality of CSI-RS ports corresponding to the CSI-RS resource.

[0466] The CSI information is configured to determine the pre-coding of the terminal based on the codebook structure corresponding to the codebook parameter information.

[0467] The CSI information comprises at least one of the following information elements: N pieces of SD basis vector indicator information or N pieces of port selection indicator information, where N is the same as the number of CSI-RS resources or N is the same as the number of port groups, and N is a positive integer that is greater than 1; one piece of combination coefficient indicator information, where the combination coefficient indicator information corresponds to a plurality of CSI-RS resources or a plurality of port groups in one CSI-RS resource; or one piece of FD basis vector indicator information, where the one piece of FD basis vector indicator information corresponds to a plurality of CSI-RS resources or a plurality of port groups in one CSI-RS resource.

[0468] The CSI information comprises at least one of the following information elements: G pieces of indication information of the SD basis vector or G pieces of indication information for selecting a port; G pieces of indication information of combination coefficients; or G pieces of indication information of the FD basis vector. The value of G coincides with the number of CSI-RS resource groups in the plurality of CSI-RS resources, the CSI-RS resource group includes at least one CSI-RS resource, or G coincides with the number of first groups among the plurality of port groups in one CSI-RS resource, and the first group includes at least one port group, and G is a positive integer that is greater than 1.

[0469] According to some embodiments, the CSI information comprises at least one of the following information elements: one piece of SD basic vector indicator information or one piece of port selection indicator information, wherein the SD indicator information or the port selection indicator information corresponds to a plurality of CSI-RS resources or a plurality of port groups in a single CSI-RS resource; one piece of combination coefficient indicator information, wherein the combination coefficient indicator information corresponds to a plurality of CSI-RS resources or a plurality of port groups in a single CSI-RS resource; or one piece of FD basic vector indicator information, wherein the FD basic vector indicator information corresponds to a plurality of CSI-RS resources or a plurality of port groups in a single CSI-RS resource.

[0470] According to some embodiments, the combination coefficient indicator information includes information about a non-zero coefficient and information about the position of the non-zero coefficient, the non-zero coefficient information indicates a non-zero coefficient in the combination coefficient indicator information, and the non-zero coefficient position information indicates a position of the non-zero coefficient in the combination coefficient indicator information.

[0471] According to some embodiments, the determining module 801 is configured to determine the SD basis vector indicator information or the port selection indicator information, the combination coefficient indicator information, and the FD basis vector indicator information, according to the channel information or the true channel information corresponding to each CSI-RS resource and the codebook parameter information.

[0472] The sending module is also configured to send CSI information to the network device, wherein the CSI includes SD basis vector indicator information or port selection indicator information, combination coefficient indicator information, and FD basis vector indicator information.

[0473] According to some embodiments, as shown in Fig. 9, the device further includes: a receiving module 803 that is configured to receive configuration information from a network device, wherein the configuration information is used to configure codebook parameter information, and the codebook parameter information is used by the terminal to determine CSI information.

[0474] According to some embodiments, the transmitting module 802 is further configured to transmit first indication information to the network device, wherein the first indication information indicates the received codebook structure; or to receive second indication information from the network device, wherein the second indication information indicates the received codebook structure.

[0475] According to some embodiments, the CSI-RS resource is a CMR resource.

[0476] According to some embodiments, different CMRs belong to the same CSI-RS resource set or to different CSI-RS resource sets.

[0477] According to some embodiments, each of the plurality of CSI-RS resources corresponds to one TRP, and at least two TRPs are configured for a CJT; or each group of the plurality of port groups in one CSI-RS resource corresponds to one TRP, and at least two TRPs are configured for a CJT.

[0478] It should be noted that, according to the above-mentioned embodiments, when implementing the functions of the device, only the division of the above-mentioned functional modules is used as an example. In actual applications, the above-mentioned functions may be assigned to different functional modules as needed. That is, the internal structure of the device may be divided into different functional modules to perform all or part of the functions described above. In addition, the device and the method according to the above-mentioned embodiments belong to the same concept, and specific implementations of the device are described in detail in the embodiments of the method, and this will not be repeated herein.

[0479] Fig. 10 shows a block diagram of an apparatus for determining pre-coding based on a codebook according to an explanatory (illustrative) embodiment of the present disclosure. As shown in Fig. 10, the apparatus includes a receiving module 1001 and a determining module 1002.

[0480] The receiving module 1001 is configured to receive CSI information from a terminal, where the CSI includes indication information corresponding to a plurality of CSI-RS resources and indication information corresponding to each CSI-RS resource, or the CSI includes indication information corresponding to a plurality of port groups in one CSI-RS resource and indication information corresponding to each port group, the port group includes a plurality of CSI-RS ports corresponding to the CSI-RS resource, and the CSI is determined by the terminal based on channel information corresponding to each CSI-RS resource in at least one CSI-RS resource and codebook parameter information.

[0481] The determining module 1002 is configured to determine the pre-coding of the terminal according to the CSI and the structure of the codebook corresponding to the parameter information of the codebook.

[0482] According to some embodiments, the CSI information comprises at least one of the following information elements: N pieces of SD basis vector indicator information or N pieces of port selection indicator information, where N is the same as the number of CSI-RS resources or the number of port groups, and N is a positive integer that is greater than 1; one piece of combination coefficient indicator information, wherein the combination coefficient indicator information corresponds to a plurality of CSI-RS resources or a plurality of port groups in a single CSI-RS resource; one piece of FD basis vector indicator information, wherein the one piece of FD basis vector indicator information corresponds to a plurality of CSI-RS resources or a plurality of port groups in a single CSI-RS resource.

[0483] According to some embodiments, the structure of the codebook is expressed by the following formulas:

[0484] here W denotes the codebook structure, N denotes the number of CSI-RS resources or the number of port groups, N _t denotes the number of transmit antenna ports, P denotes the number of CSI-RS ports, L _i denotes the number of SD basis vectors or the number of CSI-RS ports corresponding to the i-th CSI-RS resource, , M denotes the number of FD basis vectors corresponding to the i-th CSI-RS resource, or the number of FD basis vectors corresponding to the i-th port group, or the number of FD basis vectors corresponding to the i-th port group, N ₃ denotes the number of PMI sub-bands, ; denotes a matrix consisting of L _i SD basis vectors or unit basis vectors for selecting the port corresponding to the i-th CSI-RS resource, or denotes a matrix consisting of SD basis vectors or unit basis vectors for selecting the port corresponding to the i-th port group, denotes the matrix consisting of the index information of the combination coefficients, W _f denotes the matrix consisting of M basis vectors FD, H denotes the Hermitian conjugation operation of the matrix, and denotes a complex matrix with dimensions X rows and Y columns.

[0485] According to some embodiments, the CSI information comprises at least one of the following information elements: G pieces of indication information of the SD basis vector or G pieces of indication information for selecting a port; G pieces of indication information of combination coefficients; or G pieces of indication information of the FD basis vector. The value of G coincides with the number of CSI-RS resource groups in the plurality of CSI-RS resources, the CSI-RS resource group includes at least one CSI-RS resource, or G coincides with the number of first groups among the plurality of port groups in one CSI-RS resource, and the first group includes at least one port group, and G is a positive integer that is greater than 1.

[0486] According to some embodiments, the structure of the codebook is expressed by the following formulas:

[0487] here W denotes the structure of the codebook, denotes a matrix consisting of SD basis vectors or unit basis vectors for selecting the port corresponding to the CSI-RS resources in the g-th group, , or a matrix consisting of SD basis vectors or unit basis vectors for selecting a port corresponding to the port groups in the g-th group, N _g denotes the number of CSI-RS resources or the number of port groups in the g-th group, N _t denotes the number of transmit antenna ports, denotes a matrix of M _g FD basis vectors corresponding to the CSI-RS resources in the g-th group or a matrix of M _g FD basis vectors corresponding to the port groups in the g-th group, M _g denotes the number of FD basis vectors selected for the g-th group, denotes a matrix consisting of the combination coefficients corresponding to the CSI-RS resources in the g-th group, or a matrix consisting of the combination coefficients corresponding to the port groups in the g-th group, L _g denotes the number of SD basis vectors or the number of CSI-RS ports selected for the g-th group, G denotes the same as the number of CSI-RS resource groups in the CSI-RS resource set or the number of first groups among the port groups, G is a positive integer greater than 1, N ₃ denotes the number of PMI subbands, H denotes the Hermitian conjugation operation of the matrix, and denotes a complex matrix with dimensions X rows and Y columns.

[0488] According to some embodiments, the CSI information includes at least one of the following information elements: one piece of SD basis vector indicator information, wherein the SD basis vector indicator information corresponds to a plurality of CSI-RS resources or a plurality of port groups in a single CSI-RS resource; one piece of combination coefficient indicator information, wherein the one piece of combination coefficient indicator information corresponds to a plurality of CSI-RS resources or a plurality of port groups in a single CSI-RS resource; or one piece of FD basis vector indicator information, wherein the one piece of FD basis vector indicator information corresponds to a plurality of CSI-RS resources or a plurality of port groups in a single CSI-RS resource.

[0489] According to some embodiments, the structure of the codebook is expressed by the following formulas:

[0490] where No. denotes a codebook structure, N denotes the number of CSI-RS resources or the number of port groups, _Nt denotes the number of transmit antenna ports, L denotes the number of SD basis vectors or CSI-RS ports corresponding to the CSI-RS resources, or the number of SD basis vectors or CSI-RS ports corresponding to the port groups, M denotes the number of FD basis vectors corresponding to the CSI-RS resources, or the number of FD basis vectors corresponding to the port groups, _N3 denotes the number of PMI subbands, _W1 denotes a matrix consisting of L SD basis vectors or unit basis vectors for port selection for the CSI-RS resources, or a matrix consisting of L SD basis vectors or unit basis vectors for port selection for the port groups, denotes the matrix consisting of the index information of the combination coefficients, W _f denotes the matrix consisting of M basis vectors of FD, H denotes the Hermitian conjugation operation of the matrix, and denotes a complex matrix with dimensions X rows and Y columns.

[0491] According to some embodiments, the combination coefficient indicator information includes information about a non-zero coefficient and information about the position of the non-zero coefficient, the non-zero coefficient information indicates a non-zero coefficient in the combination coefficient indicator information, and the non-zero coefficient position information indicates a position of the non-zero coefficient in the combination coefficient indicator information.

[0492] According to some embodiments, the receiving module 1001 is further configured to receive CSI information from the terminal, wherein the CSI includes indicator information of the SD basis vector, indicator information of the combination coefficients, and indicator information of the FD basis vector. The indicator information of the SD basis vector or indicator information for selecting a port, the indicator information of the combination coefficients, and the indicator information of the FD basis vector are determined by the terminal in accordance with channel information or true channel information corresponding to each CSI-RS resource and codebook parameter information.

[0493] According to some embodiments, as shown in Fig. 11, the device further comprises: a transmitting module 1003 that is configured to transmit configuration information to the terminal, wherein the configuration information is used to configure codebook parameter information, and the codebook parameter information is used by the terminal to determine CSI information.

[0494] According to some embodiments, the receiving module 1001 is further configured to receive first indication information from the terminal, wherein the first indication information indicates the received codebook structure; or send second indication information to the terminal, wherein the second indication information indicates the received codebook structure.

[0495] According to some embodiments, the CSI-RS resource is a CMR resource.

[0496] According to some embodiments, different CMRs belong to the same CSI-RS resource set or to different CSI-RS resource sets.

[0497] According to some embodiments, each of the plurality of CSI-RS resources corresponds to one TRP, and at least two TRPs are configured for a CJT; or each group of the plurality of port groups in one CSI-RS resource corresponds to one TRP, and at least two TRPs are configured for a CJT.

[0498] It should be noted that, according to the above-mentioned embodiments, when implementing the functions of the device, only the division of the above-mentioned functional modules is used as an example. In actual applications, the above-mentioned functions may be assigned to different functional modules as needed. That is, the internal structure of the device may be divided into different functional modules to perform all or part of the functions described above. In addition, the device and the method according to the above-mentioned embodiments belong to the same concept, and specific implementations of the device are described in detail in the embodiments of the method, and this will not be repeated herein.

[0499] Fig. 12 shows a block diagram of a data communication device system according to an illustrative embodiment of the present disclosure. The communication device includes: a processor 1201, a receiver 1202, a transmitter 1203, a memory 1204, and a bus 1205.

[0500] The processor 1201 includes one or more processor cores. The processor 1201 performs various functional applications and information processing by running programs and modules of the software system.

[0501] Receiver 1202 and transmitter 1203 may be implemented as a communications component, which may be a communications chip.

[0502] Memory 1204 is connected to processor 1201 via bus 1205.

[0503] Memory 1204 may be used to store at least one program code, and at least one program code is executed by processor 1201 to implement each stage in the above embodiments of the method.

[0504] In addition, the communication device may be a terminal or a network device. Memory 1204 may be implemented using any type of volatile or nonvolatile memory device or a combination thereof, and volatile or nonvolatile memory devices include, but are not limited to: a magnetic disk or an optical disk, an electrically erasable programmable read-only memory (EEPROM), an erasable programmable read-only memory (EPROM), a static random access memory (SRAM), a read-only memory (ROM), magnetic memory, flash memory, and a programmable read-only memory (PROM).

[0505] According to an explanatory (illustrative) embodiment, a machine-readable data carrier is also proposed, on which an executable program code is stored. The executable program code is loaded and executed by a processor for implementing a method for determining preliminary coding based on a code book in accordance with the above-mentioned various embodiments of the method, the execution is carried out by a communication device.

[0506] According to an explanatory (illustrative) embodiment, a microcircuit is proposed that includes a programmable logic circuit and/or program instructions. When the microcircuit operates on a terminal or a network device, it is used to implement a method for determining pre-coding based on a codebook in accordance with each of the above-mentioned embodiments of the method.

[0507] According to an explanatory (illustrative) embodiment, a product in the form of a computer program is proposed. When the product in the form of a computer program is executed by a processor of a terminal or a network device, it is used to implement a method for determining pre-coding based on a codebook in accordance with each of the above-mentioned embodiments of the method.

[0508] A person skilled in the art may understand that all or part of the steps for implementing the above-mentioned embodiments may be performed by hardware or by giving commands to the corresponding hardware from a program, and the program may be stored on a machine-readable storage medium, and the above-mentioned storage medium may be a ROM, a disk, or an optical disk, etc.

[0509] The above descriptions are only optional embodiments of the present disclosure and are not intended to limit the present disclosure in any way. Any changes, equivalent replacements, improvements, etc. made within the spirit and principles of the present invention shall be included within the scope of protection of the present disclosure.

Claims (72)

1. A method for determining preliminary coding based on a code book, performed by a terminal (10), which provides for the following stages: determining (301, 601) channel information corresponding to each CSI-RS resource based on at least one channel state information reference signal resource (CSI-RS); and transmitting (302, 602), in accordance with the channel information determined in accordance with each CSI-RS resource and the codebook parameter information, CSI information to the network device (20), wherein the CSI includes indicator information corresponding to a plurality of CSI-RS resources and indicator information corresponding to each CSI-RS resource, or the CSI includes indicator information corresponding to a plurality of port groups in one CSI-RS resource and indicator information corresponding to each port group, the port group includes a plurality of CSI-RS ports corresponding to the CSI-RS resource; wherein the CSI information is configured to determine the pre-coding of the terminal based on the structure of the codebook corresponding to the parameter information of the codebook. 2. The method according to paragraph 1, characterized in that the CSI contains at least one of the following elements of information: N pieces of spatial domain basis vector designation information or N pieces of port selection designation information, where N is the same as the number of CSI-RS resources or the number of port groups, and N is a positive integer greater than 1; combination coefficient indicator information, wherein the combination coefficient indicator information corresponds to a plurality of CSI-RS resources or a plurality of port groups in one CSI-RS resource; or frequency domain basis vector indicator information, wherein the frequency domain basis vector indicator information corresponds to a plurality of CSI-RS resources or a plurality of port groups in one CSI-RS resource; wherein the CSI contains at least one of the following information elements: G pieces of spatial domain basis vector designation information or G pieces of port selection designation information; G parts of the indicator information of the combination coefficients; or G parts of the reference information of the frequency domain basis vector; wherein the value of G coincides with the number of CSI-RS resource groups in the plurality of CSI-RS resources, and the CSI-RS resource group includes at least one CSI-RS resource, or the value of G coincides with the number of first groups among the plurality of port groups in one CSI-RS resource, and the first group includes at least one port group, and G is a positive integer that is greater than 1; or wherein the CSI contains at least one of the following information elements: spatial domain basis vector designation information or port selection designation information, wherein the spatial domain basis vector designation information or port selection designation information corresponds to a plurality of CSI-RS resources or a plurality of port groups in one CSI-RS resource; combination coefficient indicator information, wherein the combination coefficient indicator information corresponds to a plurality of CSI-RS resources or a plurality of port groups in one CSI-RS resource; or frequency domain basis vector indicator information, wherein the frequency domain basis vector indicator information corresponds to a plurality of CSI-RS resources or a plurality of port groups in one CSI-RS resource. 3. The method according to item 2, characterized in that the indicator information of the combination coefficients includes information about a non-zero coefficient and information about the position of the non-zero coefficient, the information about the non-zero coefficient indicates the non-zero coefficient (coefficients) in the indicator information of the combination coefficients, and the information about the position of the non-zero coefficient indicates the position of the non-zero coefficient in the indicator information of the combination coefficients. 4. The method according to paragraph 2 or 3, characterized in that the transmission of CSI to the network device in accordance with the channel information determined in accordance with each CSI-RS resource and the information on the parameters of the code book provides for the following stages: determining (401), according to the channel information or the true channel information corresponding to each CSI-RS resource and the codebook parameter information, designation information of a spatial domain basis vector or designation information for selecting a port, designation information of combination coefficients and designation information of a frequency domain basis vector; and transmitting (402) the CSI to the network device, wherein the CSI information includes spatial domain basis vector indicator information or port selection indicator information, combination coefficient indicator information, and frequency domain basis vector indicator information. 5. The method according to paragraph 1, additionally providing for the step: receiving (502) configuration information from a network device, wherein the configuration information is used to configure codebook parameter information, and the codebook parameter information is used by the terminal to determine CSI information; in some cases, the method additionally includes one of the following stages: transmitting first indication information to a network device, wherein the first indication information indicates an adopted codebook structure; or receiving second indication information from the network device, wherein the second indication information indicates the received codebook structure. 6. The method according to claim 1, characterized in that the CSI-RS resource is a channel measurement resource (CMR); In some cases, different CMRs belong to the same CSI-RS resource set or to different CSI-RS resource sets. 7. The method according to claim 1, characterized in that each of the plurality of CSI-RS resources corresponds to one transmit/receive point (TRP), and at least two TRPs are configured for coherent joint transmission (CJT); or each group of multiple port groups in one CSI-RS resource corresponds to one TRP, and at least two TRPs are configured for CJT. 8. A method for determining preliminary coding based on a code book, performed by a network device (20), which provides for the following stages: receiving (303, 403, 701) channel state information CSI from the terminal (10), wherein the CSI includes indicator information corresponding to a plurality of channel state information reference signal resources (CSI-RS) and indicator information corresponding to each CSI-RS resource, or the CSI includes indicator information corresponding to a plurality of port groups in one CSI-RS resource and indicator information corresponding to each port group, the port group includes a plurality of CSI-RS ports corresponding to the CSI-RS resource, and the CSI is determined by the terminal based on the channel information corresponding to each CSI-RS resource in at least one CSI-RS resource and the codebook parameter information; and determining (304, 702) a preliminary coding of the terminal in accordance with the CSI and the structure of the codebook corresponding to the parameter information of the codebook. 9. The method according to claim 8, characterized in that the CSI contains at least one of the following elements of information: N pieces of spatial domain basis vector designation information or N pieces of port selection designation information, where N is the same as the number of CSI-RS resources or the number of port groups, and N is a positive integer greater than 1; combination coefficient indicator information, wherein the combination coefficient indicator information corresponds to a plurality of CSI-RS resources or a plurality of port groups in one CSI-RS resource; or frequency domain basis vector indicator information, wherein the frequency domain basis vector indicator information corresponds to a plurality of CSI-RS resources or a plurality of port groups in one CSI-RS resource; In some cases, the structure of the code book is expressed by the following formulas: where W denotes the codebook structure, N denotes the number of CSI-RS resources or the number of port groups, N _t denotes the number of transmit antenna ports, P denotes the number of CSI-RS ports, _Li denotes the number of spatial domain basis vectors or the number of CSI-RS ports corresponding to the i-th CSI-RS resource, i ∈ {1, … ,N}, or the number of spatial domain basis vectors or the number of CSI-RS ports corresponding to the i-th port group, i ∈ {1, … , N}, M denotes the number of frequency domain basis vectors corresponding to the i-th CSI-RS resource, or the number of frequency domain basis vectors corresponding to the i-th port group, N ₃ denotes the number of sub-bands of the precoding matrix indicator PMI, W _1,i denotes a matrix consisting of _Li spatial domain basis vectors or unit basis vectors for selecting a port corresponding to the i-th CSI-RS resource, or a matrix consisting of L _t spatial domain basis vectors or unit basis vectors for selecting the port corresponding to the i-th port group, denotes the matrix consisting of the index information of the combination coefficients, W _ƒ denotes the matrix consisting of M frequency domain basis vectors, H denotes the Hermitian conjugation operation of the matrix, and denotes a complex matrix with dimensions X rows and Y columns. 10. The method according to claim 8, characterized in that the CSI contains at least one of the following elements of information: G pieces of spatial domain basis vector designation information or G pieces of port selection designation information; G parts of the indicator information of the combination coefficients; or G parts of the reference information of the frequency domain basis vector; wherein the value of G coincides with the number of CSI-RS resource groups in the plurality of CSI-RS resources, and the CSI-RS resource group includes at least one CSI-RS resource, or the value of G coincides with the number of first groups among the plurality of port groups in one CSI-RS resource, and the first group includes at least one port group, and G is a positive integer that is greater than 1; In some cases, the structure of the code book is expressed by the following formulas: where W denotes the codebook structure, W _1,g denotes a matrix consisting of spatial domain basis vectors or unit basis vectors for selecting a port corresponding to the CSI-RS resources in the g-th group, g ∈ {1, … , G}, or a matrix consisting of spatial domain basis vectors or unit basis vectors for selecting a port corresponding to the port groups in the g-th group, N _g denotes the number of CSI-RS resources or the number of port groups in the g-th group, N _t denotes the number of transmit antenna ports, W _ƒ,g denotes a matrix consisting of M _g frequency domain basis vectors corresponding to the CSI-RS resources in the g-th group, or a matrix consisting of M _g frequency domain basis vectors corresponding to the port groups in the g-th group, M _g denotes the number of frequency domain basis vectors selected for the g-th group, denotes a matrix consisting of combination coefficients corresponding to the CSI-RS resources in the g-th group or a matrix consisting of combination coefficients corresponding to the port groups in the g-th group, L _g denotes the number of spatial domain basis vectors or the number of CSI-RS ports selected for the g-th group, G denotes the same as the number of CSI-RS resource groups in the CSI-RS resource set or the number of first groups among the port groups, G is a positive integer greater than 1, N ₃ denotes the number of subbands of the PMI precoding indicator matrix, H denotes the Hermitian conjugation operation of the matrix, and denotes a complex matrix with dimensions X rows and Y columns. 11. The method according to claim 8, characterized in that the CSI contains at least one of the following elements of information: spatial domain basis vector indicator information, wherein the spatial domain basis vector indicator information corresponds to a plurality of CSI-RS resources or a plurality of port groups in one CSI-RS resource; indicator information of combination coefficients, wherein the indicator information of combination coefficients corresponds to a plurality of CSI-RS resources or a plurality of port groups in one CSI-RS resource; frequency domain basis vector indicator information, wherein the frequency domain basis vector indicator information corresponds to a plurality of CSI-RS resources or a plurality of port groups in one CSI-RS resource; In some cases, the structure of the code book is expressed by the following formulas: where W denotes a codebook structure, N denotes the number of CSI-RS resources or the number of port groups, N _t denotes the number of transmit antenna ports, L denotes the number of spatial domain basis vectors or the number of CSI-RS ports corresponding to the CSI-RS resources, or the number of spatial domain basis vectors or the number of CSI-RS ports corresponding to the port groups, M denotes the number of frequency domain basis vectors corresponding to the CSI-RS resources, or the number of frequency domain basis vectors corresponding to the port groups, N ₃ denotes the number of precoding matrix indicator (PMI) subbands, W ₁ denotes a matrix consisting of L spatial domain basis vectors or unit basis vectors for port selection for the CSI-RS resources, or a matrix consisting of L spatial domain basis vectors or unit basis vectors for port selection for the port groups, denotes the matrix consisting of the index information of the combination coefficients, W _ƒ denotes the matrix consisting of M frequency domain basis vectors, H denotes the Hermitian conjugation operation of the matrix, and denotes a complex matrix with dimensions X rows and Y columns. 12. The method according to any one of paragraphs 9-11, characterized in that the indicator information of the combination coefficients includes information about a non-zero coefficient and information about the position of a non-zero coefficient, the information about a non-zero coefficient indicates a non-zero coefficient in the indicator information of the combination coefficients, and the information about the position of a non-zero coefficient indicates the position of a non-zero coefficient in the indicator information of the combination coefficients; In some cases, receiving CSI from a terminal involves the following stages: receiving CSI from the terminal, wherein the CSI information includes indication information of a spatial domain basis vector or indication information for selecting a port, indication information of combination coefficients, and indication information of a frequency domain basis vector; the designation information of the spatial domain basis vector or the designation information for selecting a port, the designation information of the combination coefficients and the designation information of the frequency domain basis vector are determined by the terminal according to the channel information or the true channel information corresponding to each CSI-RS resource and the codebook parameter information. 13. The method according to paragraph 8, further comprising the step of: transmitting (501) configuration information to the terminal, wherein the configuration information is used to configure the codebook parameter information, and the codebook parameter information is used by the terminal to determine the CSI information; in some cases, the method additionally includes one of the following stages: receiving first indication information from the terminal, wherein the first indication information indicates the received codebook structure; or transmitting a second indication information to the terminal, wherein the second indication information indicates the received codebook structure. 14. A communication device comprising: CPU; a transmitter that is connected to the processor; wherein the processor is configured to load and execute executable commands for implementing the method according to any of paragraphs 1-7. 15. A communication device comprising: CPU; a transmitter that is connected to the processor; wherein the processor is configured to load and execute executable commands for implementing the method according to any of paragraphs 8-13.