CN115333584A

CN115333584A - Method for indicating precoding matrix, terminal and network side equipment

Info

Publication number: CN115333584A
Application number: CN202110504609.2A
Authority: CN
Inventors: 塔玛拉卡·拉盖施
Original assignee: Vivo Mobile Communication Co Ltd
Current assignee: Vivo Mobile Communication Co Ltd
Priority date: 2021-05-10
Filing date: 2021-05-10
Publication date: 2022-11-11
Anticipated expiration: 2041-05-10
Also published as: CN115333584B; WO2022237711A1

Abstract

The application discloses an indicating method of a precoding matrix, a terminal and network side equipment, which belong to the technical field of terminal communication, and the indicating method of the precoding matrix of the embodiment of the application comprises the following steps: the network side equipment sends precoding matrix indication information to the terminal; the precoding matrix indication information includes first indication information and Transmission Precoding Matrix Indication (TPMI) information, the first indication information is used for indicating the number of antennas corresponding to a precoding matrix used by the terminal, the number of antennas at least includes N or M, M is an integer greater than or equal to 1, and N is an integer greater than M.

Description

Method for indicating precoding matrix, terminal and network side equipment

Technical Field

The application belongs to the technical field of terminal communication, and particularly relates to a precoding matrix indicating method, a terminal and network side equipment.

Background

Generally, before performing data transmission with a terminal, a network side device may indicate a precoding matrix for uplink transmission to the terminal. After receiving the indication from the network side device, the terminal may transmit uplink data based on the indicated precoding matrix.

At present, a terminal can support the transmission of uplink data by using precoding of different numbers of antennas, and when a network side device indicates a precoding matrix to the terminal, the network side device can indicate the precoding matrix of different numbers of antennas. However, in the current precoding matrix indication scheme, the network side device cannot dynamically indicate precoding matrices with different antenna numbers through the same signaling.

Disclosure of Invention

The embodiment of the application provides an indicating method of a precoding matrix, a terminal and a network side device, which can solve the problem that the precoding matrix with different antenna numbers cannot be dynamically indicated through the same signaling at present.

In a first aspect, a method for indicating a precoding matrix is provided, including:

the network side equipment sends precoding matrix indication information to the terminal;

the precoding matrix indication information includes first indication information and Transmission Precoding Matrix Indication (TPMI) information, the first indication information is used for indicating the number of antennas corresponding to a precoding matrix used by the terminal, the number of antennas at least includes N or M, M is an integer greater than or equal to 1, and N is an integer greater than M.

In a second aspect, an apparatus for indicating a precoding matrix is provided, including:

a sending module, configured to send precoding matrix indication information to a terminal;

the precoding matrix indication information includes first indication information and Transmission Precoding Matrix Indication (TPMI) information, where the first indication information is used to indicate the number of antennas corresponding to a precoding matrix used by the terminal, and the number of antennas at least includes N or M, where M is an integer greater than or equal to 1, and N is an integer greater than M.

In a third aspect, a method for indicating a precoding matrix is provided, including:

a terminal receives precoding matrix indication information from network side equipment, wherein the precoding matrix indication information comprises first indication information and TPMI information, the first indication information is used for indicating the number of antennas corresponding to a precoding matrix used by the terminal, the number of antennas at least comprises N or M, M is an integer larger than or equal to 1, and N is an integer larger than M;

and determining the precoding matrix indicated by the network side equipment based on the precoding matrix indication information.

In a fourth aspect, an apparatus for indicating a precoding matrix is provided, including:

a receiving module, configured to receive precoding matrix indication information from a network side device, where the precoding matrix indication information includes first indication information and TPMI information, the first indication information is used to indicate a number of antennas corresponding to a precoding matrix used by a terminal, the number of antennas at least includes N or M, where M is an integer greater than or equal to 1, and N is an integer greater than M;

and the determining module is used for determining the precoding matrix indicated by the network side equipment based on the precoding matrix indication information.

In a fifth aspect, a network side device is provided, which comprises a processor, a memory and a program or instructions stored in the memory and executable on the processor, and when executed by the processor, the program or instructions implement the steps of the method according to the first aspect.

A sixth aspect provides a network side device, including a processor and a communication interface, where the communication interface is configured to send precoding matrix indication information to a terminal; the precoding matrix indication information includes first indication information and Transmission Precoding Matrix Indication (TPMI) information, the first indication information is used for indicating the number of antennas corresponding to a precoding matrix used by the terminal, the number of antennas at least includes N or M, M is an integer greater than or equal to 1, and N is an integer greater than M.

In a seventh aspect, a terminal is provided, which comprises a processor, a memory, and a program or instructions stored on the memory and executable on the processor, the program or instructions, when executed by the processor, implementing the steps of the method according to the third aspect.

An eighth aspect provides a terminal, including a processor and a communication interface, where the communication interface is configured to receive precoding matrix indication information from a network side device, where the precoding matrix indication information includes first indication information and TPMI information, the first indication information is used to indicate a number of antennas corresponding to a precoding matrix used by the terminal, the number of antennas at least includes N or M, M is an integer greater than or equal to 1, and N is an integer greater than M, and the processor is configured to determine, based on the precoding matrix indication information, the precoding matrix indicated by the network side device.

In a ninth aspect, there is provided a readable storage medium on which is stored a program or instructions which, when executed by a processor, carries out the steps of the method of the first aspect or the steps of the method of the third aspect.

In a tenth aspect, a chip is provided, the chip comprising a processor and a communication interface, the communication interface being coupled to the processor, the processor being configured to execute a program or instructions to implement the method according to the first aspect, or to implement the method according to the third aspect.

In an eleventh aspect, there is provided a computer program/program product stored on a non-volatile storage medium, the program/program product being executable by at least one processor to perform the steps of the method according to the first aspect or to perform the steps of the method according to the third aspect.

In this embodiment of the present application, when indicating a precoding matrix to a terminal, a network side device may send precoding matrix indication information to the terminal, where the precoding matrix indication information includes first indication information and Transmission Precoding Matrix Indication (TPMI) information, the first indication information is used to indicate the number of antennas corresponding to the precoding matrix used by the terminal, the number of antennas at least includes N or M, M is an integer greater than or equal to 1, and N is an integer greater than M. Since the network side device can also indicate the number of antennas by using the first indication information when indicating the precoding matrix to the terminal by using the TPMI information, the precoding matrix indicated to the terminal can be dynamically changed by changing the number of antennas indicated by the first indication information, thereby achieving the purpose of dynamically indicating the precoding matrices of different numbers of antennas by the same signaling.

Drawings

Fig. 1 is a schematic diagram of a wireless communication system according to an embodiment of the present application;

fig. 2 is a schematic flow chart of a method of indicating a precoding matrix according to an embodiment of the application;

fig. 3 is a schematic flow chart of a method of indicating a precoding matrix according to an embodiment of the application;

fig. 4 is a schematic structural diagram of an indicating apparatus for a precoding matrix according to an embodiment of the present application;

fig. 5 is a schematic structural diagram of an indicating apparatus for a precoding matrix according to an embodiment of the present application;

fig. 6 is a schematic structural diagram of a communication device according to an embodiment of the present application;

fig. 7 is a schematic structural diagram of a terminal according to an embodiment of the present application;

fig. 8 is a schematic structural diagram of a network-side device according to an embodiment of the present application.

Detailed Description

The technical solutions in the embodiments of the present application will be described below clearly with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are some, but not all, embodiments of the present application. All other embodiments that can be derived from the embodiments given herein by a person of ordinary skill in the art are intended to be within the scope of the present disclosure.

The terms first, second and the like in the description and in the claims of the present application are used for distinguishing between similar elements and not necessarily for describing a particular sequential or chronological order. It is to be understood that the terms so used are interchangeable under appropriate circumstances such that the embodiments of the application are capable of operation in other sequences than those illustrated or otherwise described herein, and that the terms "first" and "second" used herein generally refer to a class and do not limit the number of objects, for example, a first object can be one or more. In addition, "and/or" in the specification and the claims means at least one of connected objects, and a character "/" generally means that a preceding and succeeding related objects are in an "or" relationship.

It is noted that the technology described in the embodiments of the present application is not limited to Long Term Evolution (LTE)/LTE-Advanced (LTE-a) systems, but may also be used in other wireless communication systems, such as Code Division Multiple Access (CDMA), time Division Multiple Access (Time Di)video Multiple Access (TDMA), frequency Division Multiple Access (FDMA), orthogonal Frequency Division Multiple Access (OFDMA), single-carrier Frequency-Division Multiple Access (SC-FDMA), and other systems. The terms "system" and "network" are often used interchangeably in embodiments of the present application, and the described techniques may be used for both the above-mentioned systems and radio technologies, as well as for other systems and radio technologies. The following description describes a New Radio (NR) system for purposes of example, and NR terminology is used in much of the description below, but the techniques may also be applied to applications other than NR system applications, such as generation 6 (6) ^th Generation, 6G) communication system.

Fig. 1 shows a schematic diagram of a wireless communication system to which embodiments of the present application are applicable. The wireless communication system includes a terminal 11 and a network-side device 12. Wherein, the terminal 11 may also be called as a terminal Device or a User Equipment (UE), the terminal 11 may be a Mobile phone, a Tablet Computer (Tablet Computer), a Laptop Computer (Laptop Computer) or a notebook Computer, a Personal Digital Assistant (PDA), a palmtop Computer, a netbook, a super-Mobile Personal Computer (UMPC), a Mobile Internet Device (MID), a Wearable Device (Wearable Device) or a vehicle-mounted Device (VUE), a pedestrian terminal (PUE), and other terminal side devices, and the Wearable Device includes: smart watches, bracelets, earphones, glasses, and the like. It should be noted that the embodiment of the present application does not limit the specific type of the terminal 11. The network-side device 12 may be a Base Station or a core network, where the Base Station may be referred to as a node B, an evolved node B, an access Point, a Base Transceiver Station (BTS), a radio Base Station, a radio Transceiver, a Basic Service Set (BSS), an Extended Service Set (ESS), a node B, an evolved node B (eNB), a home node B, a WLAN access Point, a WiFi node, a Transmit Receiving Point (TRP), or some other suitable terminology in the field, as long as the same technical effect is achieved, the Base Station is not limited to a specific technical vocabulary, and it should be noted that, in the embodiment of the present application, only the Base Station in the NR system is taken as an example, but a specific type of the Base Station is not limited.

The method for indicating a precoding matrix, the terminal and the network side device provided by the embodiments of the present application are described in detail below with reference to the accompanying drawings and some embodiments and application scenarios thereof.

As shown in fig. 2, an embodiment of the present application provides an indication method 200 of a precoding matrix, which may be performed by a network side device, in other words, the method may be performed by software or hardware installed in the network side device, and the method includes the following steps.

S202: the network side equipment sends precoding matrix indication information to the terminal; the precoding matrix indication information includes first indication information and Transmission Precoding Matrix Indication (TPMI) information, the first indication information is used for indicating the number of antennas corresponding to a precoding matrix used by a terminal, the number of antennas at least includes N or M, M is an integer greater than or equal to 1, and N is an integer greater than M.

In the embodiment of the present application, since the network side device further indicates the number of antennas by using the first indication information when indicating the precoding matrix to the terminal by using the TPMI information, the precoding matrix indicated to the terminal can be dynamically changed by changing the number of antennas indicated by the first indication information, thereby achieving the purpose of dynamically indicating the precoding matrices of different numbers of antennas by using the same signaling.

The Transmitted Precoding Matrix Indicator (TPMI) information may be understood as information carried by a TPMI field in the Precoding Matrix Indicator information, and may specifically include a TPMI index (TPMI index) and indication information for indicating the number of data streams (rank). The number of data streams may be understood as the number of data streams used by the terminal for data transmission, and may specifically be a single stream or multiple streams. Wherein, under different antenna numbers, a predefined mapping relation exists between the number of the TPMI indexes and data streams and the precoding matrix (namely between the TPMI information and the precoding matrix). For ease of understanding, the predefined mapping relationship may be described below by taking the number of antennas as 2 and 4, and the number of data streams as a single stream and two streams.

In the case where the number of antennas is 2 and the number of data streams is 1, a predefined mapping relationship between the TPMI information and the 2-antenna precoding matrix is shown in table 1.

TABLE 1

In the case where the number of antennas is 2 and the number of data streams is 2, a predefined mapping relationship between the TPMI information and the 2-antenna precoding matrix is shown in table 2.

TABLE 2

In the case where the number of antennas is 4 and the number of data streams is 1, a predefined mapping relationship between the TPMI information and the 4-antenna precoding matrix is shown in table 3.

TABLE 3

In the case where the number of antennas is 4 and the number of data streams is 2, a predefined mapping relationship between the TPMI information and the 4-antenna precoding matrix is shown in table 4.

TABLE 4

Based on the predefined mapping relationship, in order to achieve the purpose that the network side device can dynamically indicate precoding matrices of different antenna numbers through the same instruction, when the network side device indicates a precoding matrix to the terminal, in addition to sending the TPMI information to the terminal, the network side device may also send first indication information for indicating the antenna number to the terminal, so that the terminal may determine a corresponding precoding matrix based on the first indication information, the TPMI information, and the predefined mapping relationship.

The number of antennas indicated by the first indication information may be N, or may also be M, and the specific values of N and M may be determined according to the number of antennas supported by the terminal. In one implementation, if the number of antennas supported by the terminal includes 4, 2, and 1, N may be 4,M may be 2 or 1. In other implementation manners, if the terminal can support other antenna numbers, N and M may also be other values, which may be specifically set according to an actual situation, and are not specifically limited herein.

In one implementation, in a case that the number of antennas indicated by the first indication information is N and N is greater than 2, the precoding matrix indicated by the precoding matrix indication information is a precoding matrix corresponding to the TPMI information in a first mapping relation (which may be represented by a target precoding matrix for distinction), and the first mapping relation is a predefined mapping relation between the N-antenna precoding matrix and the TPMI information. That is, when the network side device indicates an N-antenna precoding matrix (N is greater than 2), the TPMI field resolves to a predefined precoding matrix of length N.

In the case that the number of antennas indicated by the first indication information is changed from N to M and M is greater than 1, the precoding matrix indicated by the precoding matrix indication information is a precoding matrix formed by the first M elements or the last M elements of each column in the target precoding matrix.

In this way, the number of antennas is indicated to the terminal, and when the number of antennas is N and N is greater than 2, the precoding matrix with the length of N is indicated to the terminal, and when the number of antennas is changed from N to M and M is greater than 1, the precoding matrix with the length of N, which is formed by the first M elements or the last M elements of each column in the precoding matrix, is indicated to the terminal, so that the purpose of dynamically indicating precoding matrices with different numbers of antennas through the same signaling can be achieved.

For ease of understanding, the precoding matrix indicated by the network side device may be described below by taking N =4,m =2 as an example.

In the case where the number of antennas indicated by the first indication information is 4:

if the number of data streams indicated by the TPMI information is 1 and the TPMI index is P (P is an integer greater than or equal to 0), the network side device indicates the terminal to analyze the TPMI information according to the above table 3, that is, the predefined first mapping relationship is the above table 3, and at this time, the precoding matrix indicated by the network side device is specifically the precoding matrix corresponding to the TPMI index P in the table 3.

If the number of data streams indicated by the TPMI information is 2 and the TPMI index is Q (Q is an integer greater than or equal to 0), the predefined first mapping relationship is table 4, that is, the network side device indicates the terminal to analyze the TPMI information according to table 4, where the precoding matrix indicated by the network side device is specifically the precoding matrix corresponding to the TPMI index Q in table 4.

In the case where the number of antennas indicated by the first indication information is changed from 4 to 2:

if the number of data streams indicated by the TPMI information is 1 and the TPMI index is P, the network side device indicates the terminal to analyze the TPMI information according to the table 3, that is, the predefined first mapping relationship is the table 3, and at this time, the precoding matrix indicated by the network side device is specifically a precoding matrix formed by the first M elements or the last M elements in a row in the precoding matrix corresponding to the TPMI index P in the table 3. For example, if P is 5, the precoding matrix indicated by the network side device is

The precoding matrix formed by the first two elements

Or precoding matrix formed by the last two elements

If the number of data streams indicated by the TPMI information is 2 and the TPMI index is Q, the network side device instructs the terminal to analyze the TPMI information according to the table 4, that is, the predefined first mapping relationship is the table 4In this case, the precoding matrix indicated by the network side device is specifically a precoding matrix formed by the first M elements or the last M elements of each column in the precoding matrix corresponding to the TPMI index Q in table 4. For example, if Q is 6, the network side device indicates a precoding matrix of

The precoding matrix formed by the first two elements of each column in the array

Or precoding matrix formed by the last two elements

It should be noted that, in practical applications, there may be a case where the first M elements or the last M elements of each column in the precoding matrix with the length N are all 0, and if the number of antennas indicated by the network side device is M, there is a case where one or more columns of elements in the precoding matrix indicated by the network side device are all 0. In order to avoid this, when the indicated precoding matrix is a precoding matrix formed by the first M elements of each column, the network side device may set, in advance, that the first M elements of the target precoding matrix corresponding to the indicated TPMI information are not 0, and when the indicated precoding matrix is a precoding matrix formed by the last M elements of each column, the network side device may set, in advance, that the last M elements of the target precoding matrix corresponding to the indicated TPMI information are not 0. That is to say, the terminal does not expect that elements of one or more columns in the precoding matrix indicated by the network side device are all 0, and the network side device does not indicate the precoding matrix in which elements of one or more columns are all 0 to the terminal.

For convenience of understanding, the following description may be made by taking N =4, m =2, and the number of antennas indicated by the network side device is 2 as an example.

If the number of data streams indicated by the TPMI information is 1, the predefined first mapping relationship is table 3. As can be seen from table 3, in the case where the TPMI indexes are 2 and 3, the first two elements in the corresponding precoding matrix are both 0, and in the case where the TPMI indexes are 0 and 1, the last two elements in the corresponding precoding matrix are both 0. In order to avoid the situation that one column of elements of the precoding matrix indicated by the network side device are all 0, when the precoding matrix indicated by the network side device is a precoding matrix formed by the first 2 elements of each column in the precoding matrix corresponding to the TPMI information, the TPMI index indicated by the TPMI information may not be 2 or 3, which is agreed in advance with the terminal. When the precoding matrix indicated by the network side device is a precoding matrix formed by the last 2 elements of each column in the precoding matrix corresponding to the TPMI information, the TPMI index indicated by the TPMI information may be agreed in advance with the terminal to be not 0 or 1.

If the number of data streams indicated by the TPMI information is 2, the predefined first mapping relationship is table 4. As can be seen from table 4, in the case that the TPMI index is 5, the first two elements of two columns in the corresponding precoding matrix are both 0, in the case that the TPMI indices are 1 to 4, the first two elements of the second column in the corresponding precoding matrix are both 0, in the case that the TPMI index is 0, the last two elements of two columns in the corresponding precoding matrix are both 0, and in the case that the TPMI indices are 1 to 4, the last two elements of the first column in the corresponding precoding matrix are both 0. In order to avoid the situation that one or two columns of elements of the precoding matrix indicated by the network side device are all 0, when the precoding matrix indicated by the network side device is a precoding matrix formed by the first 2 elements of each column in the precoding matrix corresponding to the TPMI information, the terminal may be configured to previously determine that the TPMI index indicated by the TPMI information is not 1 to 5. When the precoding matrix indicated by the network side device is a precoding matrix formed by the last 2 elements of each column in the precoding matrix corresponding to the TPMI information, the TPMI index indicated by the TPMI information may be predetermined by the terminal to be not 0 to 4.

In another implementation, if the TPMI information is indicated by X bits and X is an integer greater than 1, when the number of antennas indicated by the first indication information is N and N is greater than 2, the precoding matrix indicated by the precoding matrix indication information is a precoding matrix corresponding to the TPMI information in a first mapping relationship, where the first mapping relationship is a mapping relationship between a predefined N-antenna precoding matrix and the TPMI information. That is, when the TPMI information is indicated by a plurality of bits and the network side device indicates an N-antenna precoding matrix (N is greater than 2), the TPMI field is resolved into a predefined precoding matrix of length N.

If the TPMI information is indicated by the X bits, if the number of antennas indicated by the first indication information of the network-side device is changed from N to M and M is greater than 1, the precoding matrix indicated by the precoding matrix indication information is a precoding matrix corresponding to the TPMI information indicated by the Y bits in the second mapping relationship. The second mapping relation is a mapping relation between a predefined M-antenna precoding matrix and TPMI information, Y bits are first Y bits or last Y bits in X bits, Y is an integer greater than or equal to 1, and Y is smaller than X.

In this way, by indicating the number of antennas to the terminal and indicating the TPMI information by a plurality of bits, it is possible to indicate the precoding matrix of length N to the terminal when the number of antennas is N and N is greater than 2, and to indicate the precoding matrix corresponding to the TPMI information of Y bits to the terminal by the first Y bits or the last Y bits of the X bits when the number of antennas is changed from N to M and M is greater than 1, thereby achieving the purpose of dynamically indicating the precoding matrices of different numbers of antennas by the same signaling.

For convenience of understanding, the precoding matrix indicated by the network side device may be described below by taking N =4,m =2 as an example.

In the case that the network side device desires to indicate a 4-antenna precoding matrix of a single data stream to the terminal, that is, desires to indicate a precoding matrix to the terminal using table 3, knowing that 28 precoding matrices are available in fig. 3, it is possible to indicate TPMI information using 5 bits (that is, X is equal to 5). In this way, when the number of antennas indicated by the first indication information of the network side device is 4, the precoding matrix indicated by the precoding matrix indication information is the precoding matrix corresponding to the TPMI information in table 3. When the number of antennas indicated by the first indication information of the network-side device is 2 from 4, since 6 (as can be seen from table 1) antenna precoding matrices of a single data stream are represented by 3 bits, the first 3 bits or the last 3 bits of the 5 bits corresponding to the TPMI information can be used as the Y bits, and at this time, the precoding matrix indicated by the precoding matrix indication information is the precoding matrix corresponding to the TPMI information indicated by the first 3 bits or the last 3 bits in table 1.

For example, when the network side device instructs the terminal to perform data transmission using a single data stream, if the number of antennas indicated by the first indication information is 4 and the tpmi information is indicated by 5 bits 01001, the precoding matrix indicated by the precoding matrix indication information is the precoding matrix corresponding to 01001 in table 3. When the number of antennas indicated by the first indication information is changed from 4 to 2, the precoding matrix indicated by the precoding matrix indication information is a precoding matrix corresponding to 010 (the first 3 bits of 01001) or 001 (the last 3 bits of 01001) in table 1.

In the case that the network side device desires to indicate the 4-antenna precoding matrix of the dual data stream to the terminal, that is, desires to indicate the precoding matrix to the terminal using table 4, if it is known that 21 precoding matrices are shown in fig. 4, the TPMI information may be indicated using 5 bits (that is, X is equal to 5). In this way, when the number of antennas indicated by the first indication information of the network side device is 4, the precoding matrix indicated by the precoding matrix indication information is the precoding matrix corresponding to the TPMI information in table 4. When the number of antennas indicated by the first indication information of the network-side device is 2 from 4, since 3 (as can be seen from table 2) dual-antenna precoding matrices of the dual data streams are represented by 2 bits, the first 2 bits or the last 2 bits of the 5 bits corresponding to the TPMI information can be used as the Y bits, and at this time, the precoding matrix indicated by the precoding matrix indication information is the precoding matrix corresponding to the TPMI information indicated by the first 2 bits or the last 2 bits in table 2.

For example, when the network side device instructs the terminal to perform data transmission using dual data streams, if the number of antennas indicated by the first indication information is 4, and the tpmi information is indicated by 5 bits 01100, the precoding matrix indicated by the precoding matrix indication information is the precoding matrix corresponding to 01100 in table 4. If the number of antennas indicated by the first indication information is changed from 4 to 2, the precoding matrix indicated by the precoding matrix indication information is a precoding matrix corresponding to 01 (first 2 bits of 01100) or 00 (last 2 bits of 01100) in table 2.

It should be noted that, in the above implementation, the length of the Y bit may be related to at least one of the following: the number of data streams used by the terminal, the coherent or non-coherent capabilities supported by the terminal. The number of data streams used by the terminal may be indicated by the network side device, and the larger the number of data streams is, the longer the length of the Y bit is. The terminal supporting the coherent capability may be understood as a terminal supporting simultaneous use of multiple antennas for data transmission, and the terminal supporting the non-coherent capability may be understood as a terminal supporting simultaneous use of multiple antennas for data transmission. Whether the coherent or incoherent capability supported by the terminal may be the capability of the terminal itself, or may be indicated by the network side device, and in the case that the terminal supports the coherent capability, the length of the Y bit is greater than the length of the Y bit in the case that the terminal supports the incoherent capability.

In this embodiment of the application, when the network side device indicates the precoding matrix through the precoding matrix indication information, there is a case that the number of antennas indicated by the first indication information is M and M is equal to 1, that is, the network side device indicates the terminal to use a single antenna for data transmission. Since the network side device may not need to indicate the precoding matrix when indicating the terminal to use a single antenna for data transmission, the TPMI information at this time may be regarded as invalid information.

The method for indicating the precoding matrix according to the embodiment of the present application is described in detail above with reference to fig. 2. A method for indicating a precoding matrix according to another embodiment of the present application will be described in detail with reference to fig. 3.

Fig. 3 is a schematic diagram of an implementation flow of an indication method of a precoding matrix according to an embodiment of the present application, and the indication method can be applied to a terminal. It is to be understood that the interaction between the terminal and the network-side device described from the terminal is the same as that described for the network-side device in the method shown in fig. 2, and the related description is appropriately omitted to avoid redundancy. As shown in fig. 3, the method 300 includes the following steps.

S302: the terminal receives precoding matrix indication information from network side equipment, wherein the precoding matrix indication information comprises first indication information and TPMI information, the first indication information is used for indicating the number of antennas corresponding to a precoding matrix used by the terminal, the number of antennas at least comprises N or M, M is an integer larger than or equal to 1, and N is an integer larger than M.

In S302, when the network side device indicates the precoding matrix to the terminal, the network side device may send precoding matrix indication information to the terminal, and at this time, the terminal may receive the precoding matrix indication information from the network side device. The detailed description of the precoding matrix indication information may refer to the embodiment shown in fig. 2, and will not be repeated here.

S304: and determining a precoding matrix indicated by the network side equipment based on the precoding matrix indication information.

After receiving the precoding matrix indication information, the terminal may further determine a precoding matrix indicated by the network side device. In this way, since the network side device may further indicate the number of antennas using the first indication information when indicating the precoding matrix to the terminal using the TPMI information, the precoding matrix indicated to the terminal may be dynamically changed by changing the number of antennas indicated by the first indication information, thereby achieving the purpose of dynamically indicating precoding matrices of different numbers of antennas through the same signaling, so that the terminal may flexibly use precoding matrices of different numbers of antennas for data transmission according to the indication.

In this embodiment, the TPMI information includes a TPMI index and indication information for indicating the number of data streams, where the number of data streams includes a single stream or a multi-stream, and a precoding matrix indicated by the network side device corresponds to the indicated number of data streams.

In an implementation manner, in a case that the number of antennas indicated by the first indication information is N and N is greater than 2, the terminal determines, based on the precoding matrix indication information, a precoding matrix indicated by the network-side device, which may specifically be to determine, as the precoding matrix indicated by the network-side device, a target precoding matrix corresponding to the TPMI information in the first mapping relationship. Wherein the first mapping relation is a mapping relation between a predefined N-antenna precoding matrix and the TPMI information.

When the number of antennas indicated by the first indication information is changed from N to M and M is greater than 1, the terminal determines, based on the precoding matrix indication information, a precoding matrix indicated by the network side device, specifically, a precoding matrix formed by the first M elements or the last M elements of each column in the target precoding matrix may be determined as the precoding matrix indicated by the network side device.

Taking N =4,m =2 as an example, in the case where the number of antennas indicated by the first indication information is 4: if the number of data streams indicated by the TPMI information is a single stream, the terminal may determine the precoding matrix corresponding to the TPMI information in table 3 as the precoding matrix indicated by the network side device. If the number of data streams indicated by the TPMI information is two, the terminal may determine the precoding matrix corresponding to the TPMI information in table 4 as the precoding matrix indicated by the network side device.

In the case where the number of antennas indicated by the first indication information is changed from 4 to 2: if the number of data streams indicated by the TPMI information is a single stream, the terminal may determine, as the precoding matrix indicated by the network side device, a precoding matrix formed by the first 2 elements or the last 2 elements in a column of the precoding matrix corresponding to the TPMI information in table 3. If the number of data streams indicated by the TPMI information is two, the terminal may determine, as the precoding matrix indicated by the network side device, a precoding matrix formed by the first 2 elements or the last 2 elements of each column in the precoding matrix corresponding to the TPMI information in table 4.

In addition, in order to avoid invalidation or meaninglessness of the precoding matrix indicated by the network side device, when the precoding matrix indicated by the network side device is a precoding matrix formed by the first M elements of each column, the terminal may set, in advance, that the first M elements of the target precoding matrix corresponding to the indicated TPMI information are not 0, with the network side device. When the precoding matrix indicated by the network side device is a precoding matrix formed by the last M elements of each column, the terminal may set that the last M elements of the target precoding matrix corresponding to the indicated TPMI information are not 0 in advance with the network side device. Reference may be made in particular to the corresponding description of the embodiment shown in fig. 2, which is not repeated here.

In another implementation manner, if the TPMI information is indicated by X bits and X is an integer greater than 1, when the number of antennas indicated by the first indication information is N and N is greater than 2, the terminal determines, based on the precoding matrix indication information, a precoding matrix indicated by the network-side device, specifically, the precoding matrix corresponding to the TPMI information in the first mapping relationship is determined as the precoding matrix indicated by the network-side device, where the first mapping relationship is a mapping relationship between a predefined N-antenna precoding matrix and the TPMI information. I.e. the terminal parses the TPMI field into pre-defined precoding matrices of length N.

When the number of antennas indicated by the first indication information is changed from N to M and M is greater than 1, the terminal determines the precoding matrix indicated by the network side device based on the precoding matrix indication information, specifically, the precoding matrix corresponding to the TPMI information indicated by the Y bit in the second mapping relationship may be determined as the precoding matrix indicated by the network side device. The second mapping relation is a mapping relation between a predefined M-antenna precoding matrix and the TPMI information, Y bits are first Y bits or last Y bits of the X bits, and Y is an integer greater than or equal to 1 and less than X.

Taking N =4, m =2 as an example, if the network side device indicates the TPMI information by 5 bits, then:

in the case that the number of data streams indicated by the TPMI information is a single stream, if the number of antennas indicated by the first indication information is 4, the terminal may determine the precoding matrix corresponding to the TPMI information in table 3 as the precoding matrix indicated by the network side device; if the number of antennas indicated by the first indication information is changed from 4 to 2, the terminal may determine the precoding matrix corresponding to the first 3 bits or the last 3 bits of the TPMI information in table 1 as the precoding matrix indicated by the network side device.

In the case that the number of data streams indicated by the TPMI information is two streams, if the number of antennas indicated by the first indication information is 4, the terminal may determine the precoding matrix corresponding to the TPMI information in table 4 as the precoding matrix indicated by the network side device; if the number of antennas indicated by the first indication information is changed from 4 to 2, the terminal may determine a precoding matrix corresponding to the first 2 bits or the last 2 bits of the TPMI information in table 2 as the precoding matrix indicated by the network side device.

In the above implementation, the length of the Y bits may be related to at least one of: the number of data streams used by the terminal, the coherent or non-coherent capabilities supported by the terminal. Reference may be made in particular to the corresponding description of the embodiment shown in fig. 2, which is not repeated here.

In the embodiment of the application, in the precoding matrix indication information received by the terminal, if M indicated by the first indication information is equal to 1, that is, the network side device indicates the terminal to use a single antenna for data transmission. In this case, the terminal may determine to use a single antenna for transmission of uplink data and ignore the indicated TPMI information.

It should be noted that, in the method for indicating a precoding matrix provided in the embodiment of the present application, the execution main body may be an indication device of a precoding matrix, or a control module in the indication device of the precoding matrix, configured to execute the method for indicating the precoding matrix. The method for indicating the precoding matrix by the indicating device of the precoding matrix is taken as an example in the embodiment of the present application to describe the indicating device of the precoding matrix provided in the embodiment of the present application.

Fig. 4 is a schematic structural diagram of an indication apparatus of a precoding matrix according to an embodiment of the present application, and the apparatus may correspond to a network side device in other embodiments. As shown in fig. 4, the apparatus 400 includes the following modules.

A sending module 401, configured to send precoding matrix indication information to a terminal;

Because the network side equipment can also use the first indication information to indicate the number of the antennas when the TPMI information is used for indicating the precoding matrix to the terminal, the precoding matrix indicated to the terminal can be dynamically changed by changing the number of the antennas indicated by the first indication information, and the purpose of dynamically indicating the precoding matrix with different numbers of the antennas through the same signaling is achieved.

Optionally, as an embodiment, when the number of antennas indicated by the first indication information is N and N is greater than 2, the precoding matrix indicated by the precoding matrix indication information is a target precoding matrix corresponding to the TPMI information in a first mapping relationship, where the first mapping relationship is a mapping relationship between a predefined N-antenna precoding matrix and the TPMI information.

Optionally, as an embodiment, in a case that the number of antennas indicated by the first indication information is M and M is greater than 1, the precoding matrix indicated by the precoding matrix indication information is a precoding matrix formed by the first M elements or the last M elements of each column in the target precoding matrix.

Optionally, as an embodiment, when the indicated precoding matrix is a precoding matrix formed by the first M elements of each column, the indicating device and the terminal agree in advance that none of the first M elements of a target precoding matrix corresponding to the indicated TPMI information is 0;

and when the indicated precoding matrix is a precoding matrix formed by the last M elements of each column, the indicating device and the terminal agree in advance that the last M elements of the target precoding matrix corresponding to the indicated TPMI information are not 0.

Optionally, as an embodiment, the TPMI information is indicated by X bits, where X is an integer greater than 1;

under the condition that the number of antennas indicated by the first indication information is M, a precoding matrix indicated by the precoding matrix indication information is a precoding matrix corresponding to TPMI information indicated by Y bits in a second mapping relation;

the second mapping relationship is a mapping relationship between a predefined M-antenna precoding matrix and TPMI information, the Y bits are first Y bits or last Y bits of the X bits, and Y is an integer greater than or equal to 1 and less than X.

Optionally, as an embodiment, the length of the Y bit is related to at least one of: the number of data streams used by the terminal, the coherent or non-coherent capabilities supported by the terminal.

Optionally, as an embodiment, the TPMI information further includes indication information for indicating a number of data streams, where the number of data streams includes a single stream or multiple streams, and the predefined first mapping relationship and the predefined second mapping relationship correspond to the number of data streams.

Optionally, as an embodiment, in a case that the number of antennas indicated by the first indication information is M and M is equal to 1, the TPMI information is invalid.

The apparatus 400 according to the embodiment of the present application may refer to the flow corresponding to the method 200 according to the embodiment of the present application, and each unit/module and the other operations and/or functions described above in the apparatus 400 are respectively for implementing the corresponding flow in the method 200 and achieving the same or equivalent technical effects, and are not described herein again for brevity.

Fig. 5 is a schematic structural diagram of an apparatus for indicating a precoding matrix according to an embodiment of the present application, where the apparatus may correspond to a network side device in other embodiments. As shown in fig. 5, the apparatus 500 includes the following modules.

A receiving module 501, configured to receive precoding matrix indication information from a network side device, where the precoding matrix indication information includes first indication information and TPMI information, the first indication information is used to indicate a number of antennas corresponding to a precoding matrix used by a terminal, where the number of antennas at least includes N or M, where M is an integer greater than or equal to 1, and N is an integer greater than M;

a determining module 502, configured to determine, based on the precoding matrix indication information, a precoding matrix indicated by the network side device.

Since the network side device can also indicate the number of antennas by using the first indication information when indicating the precoding matrix to the terminal by using the TPMI information, the precoding matrix indicated to the terminal can be dynamically changed by changing the number of antennas indicated by the first indication information, thereby achieving the purpose of dynamically indicating the precoding matrix with different number of antennas by using the same signaling, so that the terminal can flexibly use the precoding matrix with different number of antennas for data transmission according to the indication.

Optionally, as an embodiment, the determining module 502 is configured to:

and under the condition that the number of the antennas indicated by the first indication information is N and N is greater than 2, determining a target precoding matrix corresponding to the TPMI information in a first mapping relation as a precoding matrix indicated by the network side equipment, wherein the first mapping relation is a mapping relation between a predefined N-antenna precoding matrix and the TPMI information.

Optionally, as an embodiment, the determining module 502 is configured to:

and determining a precoding matrix formed by the first M elements or the last M elements of each column in the target precoding matrix as the precoding matrix indicated by the network side equipment when the number of antennas indicated by the first indication information is M and M is greater than 1.

Optionally, as an embodiment, when the indicated precoding matrix is a precoding matrix formed by the first M elements of each column, the indicating device and the network side device agree in advance that none of the first M elements of a target precoding matrix corresponding to the indicated TPMI information is 0;

and when the indicated precoding matrix is a precoding matrix formed by the last M elements of each column, the indicating device and the network side equipment agree in advance that the last M elements of the target precoding matrix corresponding to the indicated TPMI information are not 0.

Optionally, as an embodiment, the TPMI information is indicated by X bits, X being an integer greater than 1; wherein the determining module 502 is configured to:

determining a precoding matrix corresponding to the TPMI information indicated by the Y bits in the second mapping relation as the precoding matrix indicated by the network side equipment under the condition that the number of antennas indicated by the first indication information is M;

wherein the second mapping relationship is a mapping relationship between a predefined M-antenna precoding matrix and TPMI information, the Y bits are first Y bits or last Y bits of the X bits, and Y is an integer greater than or equal to 1 and less than X.

Optionally, as an embodiment, the TPMI information further includes indication information for indicating a number of data streams, where the number of data streams includes a single stream or a multi-stream, and the precoding matrix indicated by the network side device corresponds to the indicated number of data streams.

Optionally, as an embodiment, the determining module 502 is configured to:

in the case that the number of antennas indicated by the first indication information is M and M is equal to 1, determining to use a single antenna for transmission of uplink data and ignoring the indicated TPMI information.

The apparatus 500 according to the embodiment of the present application may refer to the flow corresponding to the method 200 of the embodiment of the present application, and each unit/module and the other operations and/or functions described above in the apparatus 500 are respectively for implementing the corresponding flow in the method 300 and achieving the same or equivalent technical effects, and are not described herein again for brevity.

The indicating device of the precoding matrix in the embodiment of the present application may be a device, a device with an operating system, or an electronic device, and may also be a component, an integrated circuit, or a chip in a terminal. The device or the electronic equipment can be a mobile terminal or a non-mobile terminal. For example, the mobile terminal may include, but is not limited to, the above-listed type of terminal 11, and the non-mobile terminal may be a server, a Network Attached Storage (NAS), a Personal Computer (PC), a Television (TV), a teller machine, a kiosk, or the like, and the embodiments of the present application are not limited in particular.

The indicating device of the precoding matrix provided in the embodiment of the present application can implement each process implemented in the method embodiment of fig. 3, and achieve the same technical effect, and is not repeated here to avoid repetition.

Optionally, as shown in fig. 6, an embodiment of the present application further provides a communication device 600, which includes a processor 601, a memory 602, and a program or an instruction stored on the memory 602 and executable on the processor 601, for example, when the communication device 600 is a terminal, the program or the instruction is executed by the processor 601 to implement the processes of the method 300 embodiment, and the same technical effect can be achieved. When the communication device 600 is a network-side device, the program or the instructions are executed by the processor 601 to implement the processes of the method embodiment 200, and the same technical effect can be achieved.

The embodiment of the present application further provides a terminal, which includes a processor and a communication interface, where the communication interface is configured to receive precoding matrix indication information from a network side device, where the precoding matrix indication information includes first indication information and TPMI information, the first indication information is used to indicate a number of antennas corresponding to a precoding matrix used by the terminal, where the number of antennas at least includes N or M, M is an integer greater than or equal to 1, N is an integer greater than M, and the processor is configured to determine, based on the precoding matrix indication information, the precoding matrix indicated by the network side device. The terminal embodiment corresponds to the terminal-side method embodiment, and all implementation processes and implementation manners of the method embodiment can be applied to the terminal embodiment and can achieve the same technical effect. Specifically, fig. 7 is a schematic diagram of a hardware structure of a terminal for implementing the embodiment of the present application.

The terminal 700 includes, but is not limited to: a radio frequency unit 701, a network module 702, an audio output unit 703, an input unit 704, a sensor 705, a display unit 706, a user input unit 707, an interface unit 708, a memory 709, a processor 710, and the like.

Those skilled in the art will appreciate that the terminal 700 may further include a power supply (e.g., a battery) for supplying power to the various components, and the power supply may be logically connected to the processor 710 via a power management system, so as to manage charging, discharging, and power consumption management functions via the power management system. The terminal structure shown in fig. 7 does not constitute a limitation of the terminal, and the terminal may include more or less components than those shown, or may combine some components, or may be arranged differently, and thus, the description thereof is omitted.

It should be understood that in the embodiment of the present application, the input Unit 704 may include a Graphics Processing Unit (GPU) 7041 and a microphone 7042, and the Graphics Processing Unit 7041 processes image data of still pictures or videos obtained by an image capturing device (e.g., a camera) in a video capturing mode or an image capturing mode. The display unit 706 may include a display panel 7061, and the display panel 7061 may be configured in the form of a liquid crystal display, an organic light emitting diode, or the like. The user input unit 707 includes a touch panel 7071 and other input devices 7072. The touch panel 7071 is also referred to as a touch screen. The touch panel 7071 may include two parts of a touch detection device and a touch controller. Other input devices 7072 may include, but are not limited to, a physical keyboard, function keys (e.g., volume control keys, switch keys, etc.), a trackball, a mouse, and a joystick, which are not described in detail herein.

In the embodiment of the present application, the radio frequency unit 701 receives downlink data from a network side device and then processes the downlink data in the processor 710; in addition, the uplink data is sent to the network side equipment. In general, radio frequency unit 701 includes, but is not limited to, an antenna, at least one amplifier, a transceiver, a coupler, a low noise amplifier, a duplexer, and the like.

The memory 709 may be used to store software programs or instructions as well as various data. The memory 709 may mainly include a storage program or instruction area and a storage data area, wherein the storage program or instruction area may store an operating system, an application program or instruction (such as a sound playing function, an image playing function, etc.) required for at least one function, and the like. In addition, the Memory 709 may include a high-speed random access Memory and a nonvolatile Memory, where the nonvolatile Memory may be a Read-Only Memory (ROM), a Programmable ROM (PROM), an Erasable PROM (EPROM), an Electrically Erasable PROM (EEPROM), or a flash Memory. Such as at least one magnetic disk storage device, flash memory device, or other non-volatile solid state storage device.

Processor 710 may include one or more processing units; alternatively, processor 710 may integrate an application processor that handles primarily the operating system, user interface, and application programs or instructions, etc. and a modem processor that handles primarily wireless communications, such as a baseband processor. It will be appreciated that the modem processor described above may not be integrated into processor 710.

The radio frequency unit 701 is configured to receive precoding matrix indication information from a network side device, where the precoding matrix indication information includes first indication information and TPMI information, the first indication information is used to indicate a number of antennas corresponding to a precoding matrix used by the terminal, the number of antennas at least includes N or M, M is an integer greater than or equal to 1, and N is an integer greater than M.

A processor 710, configured to determine, based on the precoding matrix indication information, a precoding matrix indicated by the network side device.

The terminal 700 provided in this embodiment of the present application may further implement each process of the foregoing precoding matrix indication method embodiment, and may achieve the same technical effect, and for avoiding repetition, details are not repeated here.

The embodiment of the application also provides a network side device, which comprises a processor and a communication interface, wherein the communication interface is used for sending precoding matrix indication information to the terminal; the precoding matrix indication information includes first indication information and Transmission Precoding Matrix Indication (TPMI) information, where the first indication information is used to indicate the number of antennas corresponding to a precoding matrix used by the terminal, and the number of antennas at least includes N or M, where M is an integer greater than or equal to 1, and N is an integer greater than M. The embodiment of the network side device corresponds to the embodiment of the method of the network side device, and all implementation processes and implementation manners of the embodiment of the method can be applied to the embodiment of the network side device and can achieve the same technical effect.

Specifically, the embodiment of the application further provides a network side device. As shown in fig. 8, the network device 800 includes: antenna 81, radio frequency device 82, baseband device 83. The antenna 81 is connected to a radio frequency device 82. In the uplink direction, the rf device 82 receives information via the antenna 81 and sends the received information to the baseband device 83 for processing. In the downlink direction, the baseband device 83 processes information to be transmitted and transmits the information to the rf device 82, and the rf device 82 processes the received information and transmits the processed information through the antenna 81.

The above band processing means may be located in the baseband device 83, and the method performed by the network side device in the above embodiment may be implemented in the baseband device 83, where the baseband device 83 includes a processor 84 and a memory 85.

The baseband device 83 may include, for example, at least one baseband board, on which a plurality of chips are disposed, as shown in fig. 8, wherein one chip, for example, the processor 84, is connected to the memory 85 to call up the program in the memory 85 to perform the network device operation shown in the above method embodiment.

The baseband device 83 may further include a network interface 86 for exchanging information with the radio frequency device 82, such as a Common Public Radio Interface (CPRI).

Specifically, the network side device according to the embodiment of the present invention further includes: the instructions or programs stored in the memory 85 and executable on the processor 84, and the processor 84 calls the instructions or programs in the memory 85 to execute the methods executed by the modules shown in fig. 4, and achieve the same technical effects, which are not described herein for avoiding repetition.

The embodiment of the present application further provides a readable storage medium, where a program or an instruction is stored on the readable storage medium, and when the program or the instruction is executed by a processor, the program or the instruction implements each process of the above-mentioned precoding matrix indication method embodiment, and can achieve the same technical effect, and in order to avoid repetition, details are not repeated here.

Wherein, the processor is the processor in the terminal described in the above embodiment. The readable storage medium includes a computer readable storage medium, such as a Read-Only Memory (ROM), a Random Access Memory (RAM), a magnetic disk or an optical disk, and so on.

The embodiment of the present application further provides a chip, where the chip includes a processor and a communication interface, the communication interface is coupled to the processor, and the processor is configured to execute a program or an instruction to implement each process of the above-mentioned method for indicating a precoding matrix, and can achieve the same technical effect, and in order to avoid repetition, the description is omitted here.

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

It should be noted that, in this document, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising a … …" does not exclude the presence of another identical element in a process, method, article, or apparatus that comprises the element. Further, it should be noted that the scope of the methods and apparatus of the embodiments of the present application is not limited to performing the functions in the order illustrated or discussed, but may include performing the functions in a substantially simultaneous manner or in a reverse order based on the functions involved, e.g., the methods described may be performed in an order different than that described, and various steps may be added, omitted, or combined. In addition, features described with reference to certain examples may be combined in other examples.

Through the above description of the embodiments, those skilled in the art will clearly understand that the method of the above embodiments can be implemented by software plus a necessary general hardware platform, and certainly can also be implemented by hardware, but in many cases, the former is a better implementation manner. Based on such understanding, the technical solutions of the present application or portions thereof that contribute to the prior art may be embodied in the form of a computer software product, which is stored in a storage medium (such as ROM/RAM, magnetic disk, optical disk) and includes instructions for enabling a terminal (which may be a mobile phone, a computer, a server, an air conditioner, or a network device, etc.) to execute the method according to the embodiments of the present application.

While the present embodiments have been described with reference to the accompanying drawings, it is to be understood that the invention is not limited to the precise embodiments described above, which are meant to be illustrative and not restrictive, and that various changes may be made therein by those skilled in the art without departing from the spirit and scope of the invention as defined by the appended claims.

Claims

1. A method for indicating a precoding matrix, comprising:

2. The indication method according to claim 1,

and under the condition that the number of antennas indicated by the first indication information is N and N is greater than 2, the precoding matrix indicated by the precoding matrix indication information is a target precoding matrix corresponding to the TPMI information in a first mapping relation, and the first mapping relation is a mapping relation between a predefined N-antenna precoding matrix and the TPMI information.

3. The indication method according to claim 2,

and when the number of antennas indicated by the first indication information is M and M is greater than 1, the precoding matrix indicated by the precoding matrix indication information is a precoding matrix formed by the first M elements or the last M elements of each column in the target precoding matrix.

4. The indication method according to claim 3,

when the indicated precoding matrix is a precoding matrix formed by the first M elements of each column, the first M elements of a target precoding matrix corresponding to the indicated TPMI information, which are agreed in advance by the network side device and the terminal, are not 0;

and when the indicated precoding matrix is a precoding matrix formed by the last M elements of each column, the network side device and the terminal agree in advance that the last M elements of the target precoding matrix corresponding to the indicated TPMI information are not 0.

5. The indication method according to claim 1, wherein the TPMI information is indicated by X bits, X being an integer greater than 1;

under the condition that the number of antennas indicated by the first indication information is M and M is greater than 1, the precoding matrix indicated by the precoding matrix indication information is a precoding matrix corresponding to the TPMI information indicated by the Y bits in the second mapping relation;

6. The indication method according to claim 5,

the length of the Y bits is related to at least one of: the number of data streams used by the terminal, the coherent or non-coherent capabilities supported by the terminal.

7. The indication method according to any one of claims 1 to 6,

the TPMI information further includes indication information indicating a number of data streams, where the number of data streams includes a single stream or a multi-stream, and the predefined first mapping relationship and the second mapping relationship correspond to the number of data streams.

8. The indication method according to claim 1,

in case that the number of antennas indicated by the first indication information is M and M is equal to 1, the TPMI information is invalid.

9. A method for indicating a precoding matrix, comprising:

a terminal receives precoding matrix indication information from network side equipment, wherein the precoding matrix indication information comprises first indication information and TPMI information, the first indication information is used for indicating the number of antennas corresponding to a precoding matrix used by the terminal, the number of antennas at least comprises N or M, M is an integer greater than or equal to 1, and N is an integer greater than M;

10. The method according to claim 9, wherein determining the precoding matrix indicated by the network side device based on the precoding matrix indication information comprises:

and determining a target precoding matrix corresponding to the TPMI information in a first mapping relation as the precoding matrix indicated by the network side equipment under the condition that the number of antennas indicated by the first indication information is N and N is greater than 2, wherein the first mapping relation is a mapping relation between a predefined N-antenna precoding matrix and the TPMI information.

11. The indication method according to claim 10, wherein determining the precoding matrix indicated by the network side device based on the precoding matrix indication information comprises:

and when the number of antennas indicated by the first indication information is M and M is greater than 1, determining a precoding matrix formed by the first M elements or the last M elements of each column in the target precoding matrix as the precoding matrix indicated by the network side device.

12. The indication method according to claim 11,

when the indicated precoding matrix is a precoding matrix formed by the first M elements of each column, the terminal and the network side device agree in advance that none of the first M elements of a target precoding matrix corresponding to the indicated TPMI information is 0;

and when the indicated precoding matrix is a precoding matrix formed by the last M elements of each column, the terminal and the network side equipment agree in advance that the last M elements of the target precoding matrix corresponding to the indicated TPMI information are not 0.

13. The indication method according to claim 9, wherein the TPMI information is indicated by X bits, X being an integer greater than 1; determining a precoding matrix indicated by the network side device based on the precoding matrix indication information, including:

determining a precoding matrix corresponding to the TPMI information indicated by the Y bits in the second mapping relation as the precoding matrix indicated by the network side equipment under the condition that the number of antennas indicated by the first indication information is M and M is greater than 1;

14. The indication method according to any one of claims 9 to 13,

the TPMI information further includes indication information for indicating the number of data streams, where the number of data streams includes a single stream or a multi-stream, and the precoding matrix indicated by the network side device corresponds to the indicated number of data streams.

15. The indication method according to claim 9, characterized in that the method further comprises:

16. An apparatus for indicating a precoding matrix, comprising:

17. The indicating device of claim 16,

18. The indicating device of claim 17,

19. The indicating device of claim 18,

when the indicated precoding matrix is a precoding matrix formed by the first M elements of each column, the first M elements of a target precoding matrix corresponding to the indicated TPMI information, which are agreed by the network side device and the terminal in advance, are not 0;

and when the indicated precoding matrix is a precoding matrix formed by the last M elements of each column, the network side device and the terminal agree in advance that the last M elements of a target precoding matrix corresponding to the indicated TPMI information are not 0.

20. The indication apparatus according to claim 16, wherein the TPMI information is indicated by X bits, X being an integer greater than 1;

21. The indicating device of claim 20,

22. The indication device of any one of claims 16 to 21,

the TPMI information further includes indication information indicating a number of data streams, where the number of data streams includes a single stream or a multi-stream, and the predefined first mapping relationship and the predefined second mapping relationship correspond to the number of data streams.

23. The indication device of claim 16,

24. An apparatus for indicating a precoding matrix, comprising:

a receiving module, configured to receive precoding matrix indication information from a network side device, where the precoding matrix indication information includes first indication information and TPMI information, the first indication information is used to indicate a number of antennas corresponding to a precoding matrix used by a terminal, the number of antennas at least includes N or M, M is an integer greater than or equal to 1, and N is an integer greater than M;

25. The indication device of claim 24, wherein the determining module is configured to:

26. The indication device of claim 25, wherein the determining module is configured to:

27. The indicating device of claim 26,

under the condition that the indicated precoding matrix is a precoding matrix formed by the first M elements of each column, the terminal and the network side equipment agree in advance that the first M elements of a target precoding matrix corresponding to the indicated TPMI information are not 0;

28. The indication apparatus according to claim 24, wherein the TPMI information is indicated by X bits, X being an integer greater than 1; wherein the determining module is configured to:

29. The indicating device of any one of claims 24 to 28,

30. The indication device of claim 24, wherein the determining module is configured to:

31. A terminal comprising a processor, a memory and a program or instructions stored on the memory and executable on the processor, the program or instructions, when executed by the processor, implementing the steps of the method of indicating a precoding matrix as defined in any one of claims 1 to 8.

32. A network side device comprising a processor, a memory and a program or instructions stored on the memory and executable on the processor, wherein the program or instructions, when executed by the processor, implement the steps of the method for indicating a precoding matrix according to any one of claims 9 to 15.

33. A readable storage medium, characterized in that a program or instructions are stored thereon, which program or instructions, when executed by a processor, implement the method of indicating a precoding matrix as defined in any one of claims 1 to 8, or the steps of implementing the method of indicating a precoding matrix as defined in any one of claims 9 to 15.