CN117411522A

CN117411522A - Precoding matrix indication and determination methods and devices, network equipment and terminal

Info

Publication number: CN117411522A
Application number: CN202210786968.6A
Authority: CN
Inventors: 塔玛拉卡·拉盖施; 吴昊; 刘昊; 袁江伟
Original assignee: Vivo Mobile Communication Co Ltd
Current assignee: Vivo Mobile Communication Co Ltd
Priority date: 2022-07-04
Filing date: 2022-07-04
Publication date: 2024-01-16
Also published as: WO2024007918A1

Abstract

The application discloses a precoding matrix indicating and determining method, a device, network side equipment and a terminal, which belong to the technical field of communication, and the precoding matrix indicating method in the embodiment of the application comprises the following steps: the method comprises the steps that a network side device determines an indication mode of a transmission precoding index (TPMI) in Downlink Control Information (DCI); and the network side equipment sends DCI to the terminal according to the indication mode, wherein the DCI carries the indication information of the TPMI.

Description

Precoding matrix indication and determination methods and devices, network equipment and terminal

Technical Field

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

Background

Enhanced Uplink (UL) multiple-input multiple-output (MIMO) may support multiple codebooks, such as: rel-15 based 4-antenna codebook constructs an 8-antenna codebook or a discrete Fourier transform (Discrete Fourier Transform, DFT) vector based codebook such as the Rel-15 downstream codebook. The terminal reports the types of the codebooks supported by the indication to the base station through the capability based on different codebooks supported by the terminal capability, the terminal with strong capability can support various codebooks, and the base station configures one codebook supported by the terminal for the terminal through high-layer signaling. The precoding matrix used by the terminal for transmitting uplink data base stations in the UL MIMO system is indicated as a transmission precoding index (Transmit Precoding Matrix Indicator, TPMI). However, in the prior art, there is no clear technical solution for how to instruct TPMI and how to determine the precoding matrix used in uplink data transmission.

Disclosure of Invention

The embodiment of the application provides a precoding matrix indication and determination method, a device, network side equipment and a terminal, which can realize the indication of TPMI and the determination of a precoding matrix adopted in uplink data transmission.

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

the method comprises the steps that a terminal receives Downlink Control Information (DCI) sent by network side equipment, wherein the DCI carries indication information of a transmission precoding index (TPMI);

and the terminal determines a precoding matrix adopted when uplink data transmission is carried out according to the indication information of the TPMI.

In a second aspect, a precoding matrix determining apparatus is provided, which is applied to a terminal, and includes:

a first receiving module, configured to receive downlink control information DCI sent by a network side device, where the DCI carries indication information of a transmission precoding index TPMI;

and the first determining module is used for determining a precoding matrix adopted when uplink data transmission is performed according to the indication information of the TPMI.

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

the method comprises the steps that a network side device determines an indication mode of a transmission precoding index (TPMI) in Downlink Control Information (DCI);

And the network side equipment sends DCI to the terminal according to the indication mode, wherein the DCI carries the indication information of the TPMI.

In a fourth aspect, a precoding matrix indicator device is provided and applied to a network side device, and the precoding matrix indicator device includes:

a second determining module, configured to determine an indication manner of a transmission precoding index TPMI in downlink control information DCI;

and the first sending module is used for sending DCI to the terminal according to the indication mode, wherein the DCI carries the indication information of the TPMI.

In a fifth aspect, there is provided a terminal comprising a processor and a memory storing a program or instructions executable on the processor, which when executed by the processor, implement the steps of the method as described in the first aspect.

A sixth aspect provides a terminal, including a processor and a communication interface, where the communication interface is configured to receive downlink control information DCI sent by a network side device, where the DCI carries indication information of a transmission precoding index TPMI; the processor is configured to determine a precoding matrix used for uplink data transmission according to the indication information of the TPMI.

In a seventh aspect, a network side device is provided, comprising a processor and a memory storing a program or instructions executable on the processor, which when executed by the processor, implement the steps of the method according to the third aspect.

An eighth aspect provides a network side device, including a processor and a communication interface, where the processor is configured to determine an indication manner of a transmission precoding index TPMI in downlink control information DCI; the communication interface is configured to send DCI to the terminal according to the indication manner, where the DCI carries indication information of TPMI.

In a ninth aspect, there is provided a communication system comprising: a terminal and a network side device, where the terminal may be configured to perform the steps of the precoding matrix determining method as described in the first aspect, and the network side device may be configured to perform the steps of the precoding matrix indicating method as described in the third aspect.

In a tenth aspect, there is provided a readable storage medium having stored thereon a program or instructions which when executed by a processor, performs the steps of the method according to the first aspect, or performs the steps of the method according to the third aspect.

In an eleventh aspect, there is provided a chip comprising a processor and a communication interface, the communication interface and the processor being coupled, the processor being for running a program or instructions to implement the method according to the first aspect or to implement the method according to the third aspect.

In a twelfth aspect, there is provided a computer program/program product stored in a storage medium, the computer program/program product being executed by at least one processor to implement the steps of the method according to the first or third aspect.

In the embodiment of the application, the indication mode of the TPMI in the DCI is determined firstly, and then the indication information of the TPMI is sent through the DCI based on the indication mode, so that the terminal determines the precoding matrix adopted in the uplink data transmission according to the indication information of the TPMI, thereby being capable of accurately indicating the TPMI, ensuring the accurate determination of the precoding matrix adopted in the uplink data transmission, and further ensuring the accurate transmission of the uplink data.

Drawings

Fig. 1 is a block diagram of a wireless communication system to which embodiments of the present application are applicable;

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

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

fig. 4 is a schematic block diagram of a precoding matrix determining apparatus according to an embodiment of the present application;

fig. 5 is a schematic structural diagram of a terminal according to an embodiment of the present application;

Fig. 6 is a schematic block diagram of a precoding matrix indicator device according to an embodiment of the present application;

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

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

Detailed Description

Technical solutions in the embodiments of the present application will be clearly described below with reference to the drawings in the embodiments of the present application, and it is apparent that the described embodiments are some embodiments of the present application, but not all embodiments. All other embodiments obtained by a person of ordinary skill in the art based on the embodiments in the present application are within the scope of the protection of the present application.

The terms first, second and the like in the description and in the claims, are used for distinguishing between similar objects 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 sequences other than those illustrated or otherwise described herein, and that the terms "first" and "second" are generally intended to be used in a generic sense and not to limit the number of objects, for example, the first object may be one or more. Furthermore, in the description and claims, "and/or" means at least one of the connected objects, and the character "/" generally means a relationship in which the associated object is an "or" before and after.

It is noted that the techniques described in the embodiments of the present application are not limited to long term evolution (Long Term Evolution, LTE)/LTE evolution (LTE-Advanced, LTE-a) systems, but may also be used in other wireless communication systems, such as code division multiple access (Code Division Multiple Access, CDMA), time division multiple access (Time Division Multiple Access, TDMA), frequency division multiple access (Frequency Division Multiple Access, FDMA), orthogonal frequency division multiple access (Orthogonal Frequency Division Multiple Access, OFDMA), single carrier frequency division multiple access (sc-dm)Site-carrier Frequency Division Multiple Access, SC-FDMA) and other systems. The terms "system" and "network" in embodiments of the present application are often used interchangeably, and the techniques described may be used for both the above-mentioned systems and radio technologies, as well as other systems and radio technologies. The following description describes a New air interface (NR) system for purposes of example and uses NR terminology in much of the description that follows, but these techniques are also applicable to applications other than NR system applications, such as generation 6 (6) ^th Generation, 6G) communication system.

Fig. 1 shows a block 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 device 12. The terminal 11 may be a mobile phone, a tablet (Tablet Personal Computer), a Laptop (Laptop Computer) or a terminal-side Device called a notebook, a personal digital assistant (Personal Digital Assistant, PDA), a palm top, a netbook, an ultra-mobile personal Computer (ultra-mobile personal Computer, UMPC), a mobile internet appliance (Mobile Internet Device, MID), an augmented reality (augmented reality, AR)/Virtual Reality (VR) Device, a robot, a Wearable Device (weather Device), a vehicle-mounted Device (VUE), a pedestrian terminal (PUE), a smart home (home Device with a wireless communication function, such as a refrigerator, a television, a washing machine, or a furniture), a game machine, a personal Computer (personal Computer, PC), a teller machine, or a self-service machine, and the Wearable Device includes: intelligent wrist-watch, intelligent bracelet, intelligent earphone, intelligent glasses, intelligent ornament (intelligent bracelet, intelligent ring, intelligent necklace, intelligent anklet, intelligent foot chain etc.), intelligent wrist strap, intelligent clothing etc.. Note that, the specific type of the terminal 11 is not limited in the embodiment of the present application. The network-side device 12 may comprise an access network device or a core network device, wherein the access network device 12 may also be referred to as a radio access network device, a radio access network (Radio Access Network, RAN), a radio access network function or a radio access network element. Access network device 12 may include a base station, a WLAN access point, a WiFi node, or the like, which may be referred to as a node B, an evolved node B (eNB), an access point, a base transceiver station (Base Transceiver Station, BTS), a radio base station, a radio transceiver, a basic service set (Basic Service Set, BSS), an extended service set (Extended Service Set, ESS), a home node B, a home evolved node B, a transmission and reception point (Transmitting Receiving Point, TRP), or some other suitable terminology in the art, and the base station is not limited to a particular technical vocabulary so long as the same technical effect is achieved, and it should be noted that in the embodiments of the present application, only a base station in an NR system is described as an example, and the specific type of the base station is not limited.

The precoding matrix indication and determination methods, devices, network side equipment and terminals provided in the embodiments of the present application are described in detail below with reference to the accompanying drawings through some embodiments and application scenarios thereof.

As shown in fig. 2, an embodiment of the present application provides a precoding matrix determining method, including:

step 201, a terminal receives downlink control information DCI sent by a network side device, where the DCI carries indication information of a transmission precoding index TPMI;

step 202, the terminal determines a precoding matrix adopted in uplink data transmission according to the indication information of the TPMI.

The downlink control information DCI carrying the indication information of the TPMI is indicated to the terminal through the network side equipment, and the precoding matrix adopted in the uplink data transmission is determined according to the indication information of the TPMI, so that the determination of the precoding matrix adopted in the uplink data transmission can be accurately performed, and the accurate transmission of the uplink data is ensured.

Optionally, the indication information of the TPMI is indicated by at least one precoding indication field.

It should be further noted that the at least one precoding indication field includes at least one of:

A11, combining a first precoding indication domain for carrying out transmission rank and precoding matrix indication;

a12, performing a second precoding indication domain of transmission rank indication;

a13, a third precoding indication field for indicating the precoding matrix is carried out;

a14, a fourth precoding indication field for indicating the phase information;

a15, respectively carrying out at least two fifth precoding indication domains of precoding matrix indication corresponding to different codebooks;

a16, a sixth precoding indication field for jointly carrying out transmission rank and phase information indication;

a17, a seventh precoding indication field indicating first part information and an eighth precoding indication field indicating second part information of one codebook, the first part information and the second part information being used for determining a precoding matrix in the codebook

A18, at least two ninth precoding indication fields corresponding to precoding matrix indications of the same codebook.

The at least one precoding indication field may be divided into the following cases.

Case one, DCI includes only one precoding indication field

In this case, generally included in the DCI is a first precoding indication field that jointly performs transmission rank and precoding matrix indication.

Case two, DCI includes two precoding indication fields

Alternatively, this case can be further divided into the following expressions:

a first expression, a second precoding indication field for performing transmission rank indication, and a third precoding indication field for performing precoding matrix indication;

two ninth precoding indication fields of the second expression form corresponding to the precoding matrix indication of the same codebook;

for example, in this case, each ninth precoding indication field indicates a precoding matrix in the same codebook, respectively.

A third expression form, respectively carrying out two fifth precoding indication fields of precoding matrix indication corresponding to different codebooks;

expression four, a third precoding indication field for indicating a precoding matrix and a sixth precoding indication field for indicating a joint transmission rank and phase information.

Expression form five, a first precoding indication field for jointly carrying out transmission rank and precoding matrix indication and a fourth precoding indication field for carrying out phase information indication;

expression form six, a seventh precoding indication field indicating the first part information of one codebook and an eighth precoding indication field indicating the second part information;

for example, the seventh precoding indication field indicates a first component (i_1, 1) of the precoding matrix and the eighth precoding indication field indicates a second component (i_1, 2) of the precoding matrix.

Case three, including three precoding indication fields in DCI

Alternatively, this case can be further divided into the following expressions:

a first expression, a second precoding indication field for performing transmission rank indication, a third precoding indication field for performing precoding matrix indication, and a fourth precoding indication field for performing phase information indication;

a second precoding indication domain for performing transmission rank indication and at least two ninth precoding indication domains corresponding to precoding matrix indication of the same codebook;

the third expression form is a second precoding indication domain for carrying out transmission rank indication, and two fifth precoding indication domains for respectively carrying out precoding matrix indication corresponding to different codebooks;

expression four, a second precoding indication field for transmission rank indication, a seventh precoding indication field for indicating the first partial information of one codebook, and an eighth precoding indication field for the second partial information.

It should be noted that, before performing DCI transmission, the network side device needs to determine an indication manner of TPMI in the DCI, where the indication manner is used to restrict that the DCI carries several precoding indication domains and specific content indicated by each precoding indication domain, that is, the indication manner specifically refers to content included in at least one precoding indication domain, that is, the indication manner is used to indicate that indication information of the TPMI is indicated by at least one of a11 to a 18; after determining the indication mode of the TPMI, the network side device sends DCI to the terminal according to the indication mode. Further, the network side device needs to determine the indication mode of the TPMI in the DCI according to the codebook type corresponding to the codebook configured for the terminal, the information related to the codebook and the supported transmission rank; note that, the codebook Type includes Type I single panel codebook, type I multi panel codebook, type II codebook, enhanced Type II codebook, and the like; the codebook-related information may include the number of antennas (e.g., the number of antennas N1 in the lateral direction, the number of antennas N2 in the vertical direction), an oversampling factor of DFT vector (an oversampling factor O1 in the N1 dimension, an oversampling factor O2 in the N2 dimension), a codebook subset Cluster (CBSR), and the like.

It should be further noted that, before the terminal and the network side device transmit DCI, the network side device may further configure, through higher layer signaling, first information, where the first information is used to indicate a first precoding matrix set that the terminal can use, and the first information includes at least one of the following: codebook type, information related to the codebook, transmission rank limit, CBSR.

It should be noted that, after the terminal obtains the first information configured by the higher layer signaling, it can determine which of the precoding matrices that the terminal can use, and in some cases, not all the precoding matrix terminals can use at present, where the network side device may send, through a medium access control layer control unit (MAC CE), second information to the terminal, where the second information is used to indicate a second precoding matrix set, where the second precoding matrix set is a subset of the first precoding matrix set, that is, the higher layer signaling is configured to be a total precoding matrix set, and the range of the usable precoding matrix set can be further reduced through the MAC CE, and then the DCI indicates a precoding matrix in a small range, so that the overhead of the indication field in the DCI can be reduced. For example, precoding matrix 1 to precoding matrix 100 are configured through higher layer signaling, then specifically usable precoding matrices are indicated as precoding matrix 50 to precoding matrix 80 through MAC CE, and finally the precoding matrix used for final uplink transmission is determined as precoding matrix 76 through TPMI carried in DCI.

Further, the second information includes at least one of the following:

b11, starting index and ending index of the precoding matrix;

b12, at least one group of precoding matrix indicators;

b13, bit map.

Optionally, in order to ensure that the network side device can accurately configure a usable precoding matrix for the terminal, the terminal may further send capability information to the network side device, where the capability information includes information of at least one codebook supported by the terminal and used for uplink transmission. Alternatively, the codebook information may include codebook types, antenna architectures, codebook-related information, and supported transmission ranks.

The following describes a specific implementation manner of determining a precoding matrix to be used when uplink data transmission is performed according to the indication information of the TPMI.

In case one, the at least one precoding indication field includes a first precoding indication field for jointly performing transmission rank and precoding matrix indication or the at least one precoding indication field includes a seventh precoding indication field for indicating first part information and an eighth precoding indication field for indicating second part information of one codebook

Optionally, in this case, the determining, by the terminal, an implementation manner of a precoding matrix adopted when performing uplink data transmission according to the indication information of the TPMI includes:

Determining a precoding matrix adopted when uplink data transmission is carried out according to a first mapping relation between the TPMI and the precoding matrix, wherein the precoding matrix corresponds to the indication information of the TPMI;

wherein the first mapping relation includes:

and according to the ordering of the transmission ranks, respectively ordering the precoding matrixes corresponding to the same codebook under the same transmission rank, and corresponding the precoding matrixes to the TPMI according to the ordering order.

That is, in this case, precoding matrices corresponding to the same codebook are uniformly ordered, for example, the transmission ranks have values of 1 and 2, and the precoding matrices include precoding matrices 1 to 10; when the order is performed, 10 precoding matrixes corresponding to the case of the transmission rank of 1 are arranged firstly, then 10 precoding matrixes corresponding to the case of the transmission rank of 2 are arranged, and then mapping between the precoding matrixes and the TPMI is performed based on the overall order.

Alternatively, the mapping manner may be adopted for the first case, the fifth case, the sixth case, and the fourth case in the above-mentioned division of the at least one precoding indication field.

In case two, the at least one precoding indication field includes a third precoding indication field for performing precoding matrix indication

determining a precoding matrix adopted when uplink data transmission is carried out according to a second mapping relation between the TPMI and the precoding matrix, wherein the precoding matrix corresponds to the indication information of the TPMI;

wherein the second mapping relationship includes one of:

c11, ordering precoding matrixes corresponding to the same codebook under the same transmission rank, and corresponding the precoding matrixes under the same transmission rank to the TPMI according to the ordering order;

it should be noted that, in this case, the precoding matrices corresponding to the same codebook in each transmission rank are uniformly ordered, and the precoding matrices in different transmission ranks and the TPMI are mapped respectively, and alternatively, in this case, the TPMI corresponding to the precoding matrices in different transmission ranks may be the same.

C12, uniformly ordering precoding matrixes corresponding to the same codebook under all transmission ranks, and corresponding the precoding matrixes to the TPMI according to an ordering sequence;

in this case, the transmission rank and the precoding matrix are combined and ordered, and then the precoding matrix and TPMI are mapped based on the overall ordering.

Alternatively, the above-mentioned expression one of the second case, expression four, expression one of the third case in the division of at least one precoding indication field may use such a mapping manner.

In the third case, the at least one precoding indication field includes at least two fifth precoding indication fields for respectively performing precoding matrix indications corresponding to different codebooks

and determining a precoding matrix adopted when uplink data transmission is carried out by carrying out direct product operation on the precoding matrix indicated by the at least two fifth precoding indication domains.

Alternatively, the third expression in the second case and the third expression in the third case in the above-mentioned division of at least one precoding indication field may perform precoding matrix acquisition in this way.

Further, in the case that the at least one precoding indication field further includes a second precoding indication field for performing transmission rank indication, a transmission rank indicated by the second precoding indication field is smaller than or equal to a number of transmission layers that can be supported by a direct product operation result of a precoding matrix indicated by at least two fifth precoding indication fields for performing a direct product operation; optionally, the implementation manner of determining the precoding matrix adopted when the uplink data is transmitted is that the direct product operation is performed on the precoding matrix indicated by the at least two fifth precoding indication fields:

And when the transmission rank indicated by the second precoding indication field is smaller than the number of transmission layers which can be supported by the direct product operation result, taking a precoding vector with the same column number as the transmission rank indicated by the second precoding indication field as a precoding matrix adopted when uplink data transmission is carried out in the direct product operation result.

Optionally, in the direct product operation result, the implementation manner of using the precoding vector with the same column number as the transmission rank indicated by the second precoding indication field as the precoding matrix adopted when uplink data transmission is performed is as follows:

taking the precoding vectors arranged in the forefront or rearmost N columns in the direct product budget result as a precoding matrix adopted in uplink data transmission;

wherein N is equal to the transmission rank indicated by the second precoding indication field.

In the fourth case, the at least one precoding indication field includes at least two ninth precoding indication fields corresponding to precoding matrix indications of the same codebook

Optionally, in this case, the fourth indicates two precoding matrices respectively, and specifically in this case, the determining, by the terminal, an implementation manner of the precoding matrix adopted when performing uplink data transmission according to the indication information of the TPMI includes:

And carrying out direct product operation on the precoding matrixes indicated by at least two ninth precoding indication domains corresponding to the precoding matrix indication of the same codebook, and determining the precoding matrix adopted in uplink data transmission.

In this case, the transmission rank of the finally obtained precoding matrix is the product of the transmission ranks corresponding to the precoding matrix indicated by the at least two ninth precoding indication fields.

Alternatively, the second expression in the second case and the second expression in the third case may use such a manner of determining the precoding matrix used for uplink data transmission.

The specific application of the present application will be described in detail below by taking a terminal communicating with a base station as an example.

In a specific application case I, a terminal supports a Type I codebook based on DFT, a base station configures the Type I codebook based on DFT for the terminal, a control signaling DCI comprises a precoding indication domain, the precoding indication domain jointly carries out transmission rank and precoding matrix indication, and the mapping relation between TPMI and a specific precoding matrix indicated by the indication domain is as follows:

note that, since the value of the transmission rank is generally represented by a transmission Rank Identifier (RI), the precoding matrix used for the uplink transmission is represented by TPMI, that is, the indication field indicates RI and TPMI jointly. The values of the selectable transmission rank include X { r } ₁ ,r ₂ ,…,r _X E.g. according to MaxRank or RI restriction etc., rank is r _n (r _n Take on the value of nth transmission rank) TPMI selectable values include Y _n Personal (S)(i _n,0 The value of the corresponding first TPMI is given to the value of the nth transmission rank; for example, according to N1, N2, O1, O2 or CBSR, etc.), which indicates the domain indicated value i (i takes a value of 0 to +.>) Mapping to->Wherein n is ₀ Satisfy->(wherein Y is ₀ =0), or n ₀ To meet->Is the maximum positive integer of (3), TPMI is +.>

The indication field jointly indicates RI, first TPMI (i_1), and second TPMI (i_2). RI-selectable value rank includes X { r } ₁ ,r ₂ ,…,r _X E.g. according to MaxRank or RI restriction etc., rank is r _n When the i_1 optional value includesThe values of i_2 optional include +.>Then the indication field indicates i (i takes a value of 0 to) Mapping to rank=r _n0 Wherein n is ₀ Satisfy->(wherein Y is ₀ ＝0，Z ₀ =0), or n ₀ To meet->I_1 is +.>i_2 is +.>Wherein->Or the mapping order of i_1 and i_2 is exchanged, i_2 is +.>i_1 is

In the above example, if RI can be selected to have the value { r } ₀ ,r ₁ ,…,r _X-1 Then the value of j in the summation equation above starts from-1 and defines Y _-1 ＝0，Z _-1 ＝0。

The above example can be further extended to more information, such as the case including rank, the first component (i_1, 1) of the precoding matrix, the second component (i_1, 2), the phase (i_2), or the number of selectable values of i_2 depending on the value of i_1 (or i_1,1, i_1, 2), and may be used for the indication field in other specific application cases.

The specific application case II, the terminal supports a Type I codebook based on DFT, the base station configures the Type I codebook based on DFT for the terminal, the control signaling DCI comprises two precoding indication domains, one indication domain is used for indicating a transmission rank, the other indication domain is used for indicating a precoding matrix corresponding to the indicated transmission rank, and the mapping relation between the indication domains and the specific precoding matrix is as follows:

an indication field for indicating a transmission rank: for example, the field is 0 bits when the maximum rank is supported by 1, 1 bit when the maximum rank is supported by 2, 2 bits when the maximum rank is supported by 4, and 3 bits when the maximum rank is supported by 8; or the indication field length is determined by a transmission rank restriction (rank restriction), for example, the maximum supported transmission rank is 8, but the base station is configured with a transmission rank restriction (rank restriction) of {4,5,6,7}, that is, only supported transmission ranks {1,2,3,8}, the indication field length is 2 bits.

An indication field for indicating a precoding matrix:

precoding matrices corresponding to the mapping mode one and different transmission ranks are respectively numbered, and in the following example, i is arranged first under rank=1 _1,1 Re-row i _1,2 Re-row i ₂ Re-row i ₃ . Of course the order of ordering mentioned before is merely an example, and the ordering may be replaced by an alternative ordering.

When the indication field indicating the transmission rank indicates transmission rank=1, the mapping relationship between the TPMI index indicated by the indication field indicating the precoding matrix and the precoding matrix in table 1 is:

TPMI index i= (i) _1,1 )+N ₁ O ₁ (i _1,2 )+N ₁ O ₁ N ₂ O ₂ (i ₂ )。

Table 1 precoding matrix for 1-layer CSI reporting using antenna ports 3000 to 2999+csi-RS port number

When the indication field indicating the transmission rank indicates transmission rank=2, 3 or 4, the mapping relationship between the TPMI index indicated by the indication field indicating the precoding matrix and the precoding matrix in table 2, table 3 or table 4 is:

TPMI index i= (i) _1,1 )+N ₁ O ₁ (i _1,2 )+N ₁ O ₁ N ₂ O ₂ (i ₂ )+2N ₁ O ₁ N ₂ O ₂ (i ₃ )。

Table 2 precoding matrix for 2-layer CSI reporting using antenna port 3000 to 2999+csi-RS port number

Table 3 precoding matrix for 3-layer CSI reporting using antenna port 3000 to 2999+csi-RS port number

Table 4 precoding matrix for 4-layer CSI reporting using antenna port 3000 to 2999+csi-RS port number

Table 5 3 layer CSI reported i _1,3 To k ₁ And k ₂ Mapping of (a)

TABLE 6 i for 3-layer CSI reporting when the number of CSI-RS ports is less than 16 _1,3 To k ₁ And k ₂ Mapping of (a)

When the indication field indicating the transmission rank indicates transmission rank rank=5 or 6, the mapping relationship between the TPMI index indicated by the indication field indicating the precoding matrix and the precoding matrix in table 7 or table 8 is:

When N is ₁ ＝4,N ₂ When=1, TPMI index i= (i) _1,1 )+N ₁ O ₁ (i ₂ )；

When N is ₁ ＝2,N ₂ When=2, TPMI index i= (i) _1,1 )+N ₁ O ₁ (i _1,2 )+N ₁ O ₁ N ₂ O ₂ (i ₂ )。

Table 7 precoding matrix for 5-layer CSI reporting using antenna ports 3000 to 2999+csi-RS port number

Table 8 precoding matrix for 6-layer CSI reporting using antenna ports 3000 to 2999+csi-RS port number

When the indication field indicating the transmission rank indicates transmission rank=7 or 8, the mapping relationship between the TPMI index indicated by the indication field indicating the precoding matrix and the precoding matrix in table 9 or table 10 is:

when N is ₁ ＝4,N ₂ When=1, TPMI index

When N is ₁ ＝2,N ₂ When=2, TPMI index i= (i) _1,1 )+N ₁ O ₁ (i _1,2 )+N ₁ O ₁ N ₂ O ₂ (i ₂ 0。

Table 9 precoding matrix for 7-layer CSI reporting using antenna port 3000 to 2999+csi-RS port number

Table 10 precoding matrix for 8-layer CSI reporting using antenna port 3000 to 2999+csi-RS port number

Mapping mode II and the TPMI indexes corresponding to all the rank are uniformly numbered

TPMI index i=i1, 1×i1,2×i2×i3+i1, 2×i2+i3+i2×i3;

where i3 represents the offset of DFT vectors corresponding to different data flows.

The specific application case III, the terminal supports a Type I codebook based on DFT, the base station configures the Type I codebook based on DFT for the terminal, the control signaling DCI comprises two precoding indication domains, one indication domain is used for carrying out precoding matrix indication, namely carrying TPMI (namely DFT vector index), the other indication domain is used for carrying out phase indication, and the mapping relation between the indication domains and the specific precoding matrix is as follows:

An indication field for indicating a precoding matrix: the indication field jointly performs transmission rank and precoding matrix indication, and this case is the same as the specific application case one and will not be described here again.

Indication field for phase indication: an indication to coherently combine phase information, such as: 2 bits correspond to quadrature phase shift keying (Quadrature Phase Shift Keying, QPSK) and 3 bits correspond to 8PSK.

In a fourth specific application case, the terminal supports a Type I codebook based on DFT, and the base station configures the Type I codebook based on DFT for the terminal, wherein the control signaling DCI includes three precoding indication domains, one of which is used for indicating a transmission rank, one of which is used for indicating a precoding matrix corresponding to the indicated transmission rank, and one of which is used for performing phase indication, and the mapping relationship between the indication domains and the specific precoding matrix is as follows:

an indication field for indicating a transmission rank: such as: the field is 0 bits when the maximum rank is 1, 1 bit when the maximum rank is 2, 2 bits when the maximum rank is 4, and 3 bits when the maximum rank is 8. Or the indicated domain length is determined by a transmission rank restriction (rank restriction), such as: the maximum supported transmission rank is 8, but the base station is configured with a transmission rank restriction (rank restriction) of {4,5,6,7}, that is to say only the transmission ranks {1,2,3,8} are supported, the indicated field length being 2 bits.

An indication field for indicating a precoding matrix:

precoding matrices corresponding to the mapping mode one and different transmission ranks are respectively numbered, and in the following example, i is arranged first under rank=1 _1,1 Re-row i _1,2 Re-row i ₃ . Of course the order of ordering mentioned before is merely an example, and the ordering may be replaced by an alternative ordering.

TPMI index i= (i) _1,1 )+N ₁ O ₁ (i _1,2 )。

TPMI index i= (i) _1,1 )+N ₁ O ₁ (i _1,2 )+2N ₁ O ₁ N ₂ O ₂ (i ₃ )。

When the indication field indicating the transmission rank indicates transmission rank=5, 6, 7 or 8, the mapping relationship of the TPMI indexes indicated by the indication field indicating the precoding matrix in table 7, table 8, table 9 or table 10 is:

when N is ₁ ＝4,N ₂ When=1, TPMI index i= (i) _1,1 )；

When N is ₁ ＝2,N ₂ When=2, TPMI index i= (i) _1,1 )+N ₁ O ₁ (i _1,2 )。

TPMI index i=i1, 1×i1,2×i3+i1, 2×i3+i3.

Indication field for phase indication: an indication to coherently combine phase information, such as: 2 bits correspond to QPSK and 3 bits correspond to 8PSK.

In the specific application case five, the terminal supports a third codebook formed by two different codebooks, the base station configures the codebook for uplink transmission for the terminal, the control signaling DCI comprises two precoding indication domains, one indication domain indicates a precoding matrix corresponding to the first codebook, the corresponding rank is R1, the other indication domain indicates a precoding matrix corresponding to the second codebook, the corresponding rank is R2, and a certain mathematical operation is adopted to obtain a final precoding matrix corresponding to the third codebook. The corresponding transmission rank is the rank value corresponding to the first codebook multiplied by the rank value corresponding to the second codebook, and the indicated total rank is R1×R2.

Precoding indication field for indicating a precoding matrix under one codebook: codebook a corresponding precoding index TPMI1, such as: codebook one is the 2 antenna codebook in NR Rel-15 protocol, supporting a maximum rank of 2.

A precoding indication field for indicating a precoding matrix under another codebook: precoding index TPMI2 corresponding to codebook two, for example: the first codebook is a 4-antenna codebook in NR Rel-15 protocol, and the maximum rank is supported to be 4.

The third codebook is an 8-antenna codebook, and the final 8-antenna precoding information is obtained by the 2-antenna codebook and the 4-antenna codebook through mathematical operation; the maximum transmission rank is 2×4=8. Such as: the base station indicates a rank-1 2 antenna precoding matrix (TPMI 1) in a first precoding indication field and a rank-3 4 antenna precoding matrix (TPMI 2) in a second indication field, and then the total transmission rank is 3, the final precoding matrix is a rank-1 2 antenna codebook and a rank-3 4 antenna codebook are obtained through a direct product (kronecker) operation. Some transmission ranks cannot be supported under this precoding indication method, such as rank values=5 and 7.

In the sixth specific application case, the terminal supports a third codebook formed by two different codebooks, and the base station configures the codebook for uplink transmission for the terminal, wherein the control signaling DCI comprises three precoding indication domains, one of which is used for indicating the transmission rank, the other of which is used for indicating the precoding matrix corresponding to the first codebook and the precoding matrix corresponding to the second codebook, and a final precoding matrix corresponding to the third codebook is obtained by adopting a certain mathematical operation. The corresponding transmission rank indicated by the indication field for indicating a transmission rank is a rank value corresponding to the first codebook multiplied by a rank value corresponding to the second codebook, R < = r1×r2.

An indication field for indicating a transmission rank: indicating the total transmission rank. The indicated field size is as follows: the field is 0 bits when the maximum rank is 1, 1 bit when the maximum rank is 2, 2 bits when the maximum rank is 4, and 3 bits when the maximum rank is 8. Or the indicated domain length is determined by a transmission rank restriction (rank restriction), such as: the maximum supported transmission rank is 8, but the base station is configured with a transmission rank restriction (rank restriction) of {4,5,6,7}, that is to say only the transmission ranks {1,2,3,8} are supported, the indicated field length being 2 bits.

The third codebook is an 8-antenna codebook, and the final 8-antenna precoding information is obtained by the 2-antenna codebook and the 4-antenna codebook through mathematical operation; the maximum transmission rank is 2×4=8. Such as: the base station indicates rank value=5 in an indication field for indicating transmission rank, indicates 2 antenna precoding matrix (TPMI 1) of rank 2 in a precoding indication field for indicating precoding matrix under one codebook, indicates 4 antenna precoding matrix (TPMI 2) of rank 3 in a precoding indication field for indicating precoding matrix under another codebook, and finally obtains 2 antenna codebook of rank 2 and 4 antenna codebook of rank 3 of precoding matrix through direct product operation, and the total precoding matrix corresponds to codebook of rank 6. In the following formula I, (X) is a direct product, and the first matrix on the left side of the formula I is a 4 row 3 column matrix kroneker 2 row 2 column matrix; the right side of the equation is an 8 row 6 column matrix. Because the rank indicated this time is 5, the precoding vector of the first 5 columns or the last 5 columns of the precoding matrix is finally fetched.

Equation one:

the specific application case seven, the terminal supports the Type I codebook based on DFT, and the base station configures the Type I codebook based on DFT for the terminal, wherein the control signaling DCI comprises two precoding indication domains, one indication domain is used for indicating a precoding matrix, the other indication domain jointly indicates a transmission rank and a corresponding phase, and the mapping relation between the indication domains and the specific precoding matrix is as follows:

indication field jointly indicating transmission rank and corresponding phase: jointly indicates transmission Rank (RI) and coherently combines phase information, such as: the supported transmission ranks are {1,2,3,4}; supported coherent combining phase corresponds to QPSKThe indication field is 4 bits in length for a total of 16 states, each state indicating a transmission rank and coherent combining phase combination.

An indication field for indicating a precoding matrix:

precoding corresponding to mapping mode one and different transmission ranksThe code matrices are numbered separately, in the following example i is first row i, e.g. rank=1 _1,1 Re-row i _1,2 Re-row i ₃ . Of course the order of ordering mentioned before is merely an example, and the ordering may be replaced by an alternative ordering.

TPMI index i= (i) _1,1 )+N ₁ O ₁ (i _1,2 )。

when N is ₁ ＝4,N ₂ When=1, TPMI index i= (i) _1,1 )；

TPMI index i=i1, 1×i1,2×i3+i1, 2×i3+i3.

It should be noted that, in at least one embodiment of the present application, the following beneficial effects can be achieved:

1. supporting flexible configuration of a codebook of an uplink transmission precoding matrix and determining a mapping relation between a TPMI index and a specific precoding matrix;

2. controlling the expenditure of the TPMI domain in the DCI through the MAC CE signaling;

3. and acquiring all the transmission rank which can be supported under the third precoding matrix based on the direct product operation of the first precoding matrix and the second precoding matrix.

As shown in fig. 3, an embodiment of the present application provides a precoding matrix indicating method, including:

Step 301, a network side device determines an indication mode of a transmission precoding index TPMI in downlink control information DCI;

in step 302, the network side device sends DCI to the terminal according to the indication mode, where the DCI carries indication information of TPMI.

Optionally, the determining, by the network side device, an indication manner of the transmission precoding index TPMI in the downlink control information DCI includes:

the network side equipment determines the indication mode of the TPMI in the DCI according to the codebook type corresponding to the codebook configured for the terminal, the information related to the codebook and the supported transmission rank.

Optionally, before the network side device sends DCI to the terminal according to the indication manner, the method further includes:

the network side equipment configures first information through high-layer signaling, wherein the first information is used for indicating a first precoding matrix set which can be used by a terminal, and the first information comprises at least one of the following: codebook type, information related to the codebook, transmission rank limit, codebook subset restriction CBSR.

Optionally, after the network side device configures the first information through higher layer signaling, the method further includes:

the network side equipment sends second information to the terminal through a Media Access Control (MAC) CE, wherein the second information is used for indicating a second precoding matrix set, and the second precoding matrix set is a subset of the first precoding matrix set.

Optionally, the second information includes at least one of:

a start index and a stop index of the precoding matrix;

at least one set of precoding matrix indicators;

bit map.

Optionally, the at least one precoding indication field includes at least one of:

a first precoding indication field for jointly performing transmission rank and precoding matrix indication;

a second precoding indication field for performing transmission rank indication;

a third precoding indication field for precoding matrix indication;

a fourth precoding indication field for indicating the phase information;

at least two fifth precoding indication domains corresponding to different codebooks and indicated by precoding matrixes are respectively carried out;

a sixth precoding indication field for jointly performing transmission rank and phase information indication;

a seventh precoding indication field indicating first partial information of one codebook and an eighth precoding indication field indicating second partial information for determining a precoding matrix in the codebook.

Optionally, in a case that the at least one precoding indication field includes a first precoding indication field for jointly performing transmission rank and precoding matrix indication, or the at least one precoding indication field includes a seventh precoding indication field for indicating first part information and an eighth precoding indication field for indicating second part information of one codebook, the first mapping relationship between the TPMI and the precoding matrix includes:

Optionally, in a case that the at least one precoding indication field includes a third precoding indication field for indicating a precoding matrix, the second mapping relationship between the TPMI and the precoding matrix includes:

ordering precoding matrixes corresponding to the same codebook under the same transmission rank, and corresponding the precoding matrixes under the same transmission rank with the TPMI according to an ordering sequence; or alternatively

And uniformly ordering the precoding matrixes corresponding to the same codebook under all transmission ranks, and corresponding the precoding matrixes to the TPMI according to the ordering order.

Optionally, in the case that the at least one precoding indication field includes at least two fifth precoding indication fields for respectively performing precoding matrix indications corresponding to different codebooks and a second precoding indication field for performing transmission rank indication, the transmission rank indicated by the second precoding indication field is smaller than or equal to the number of transmission layers that can be supported by a direct product operation result of direct product operation performed by the precoding matrices indicated by the at least two fifth precoding indication fields.

Optionally, the method further comprises:

the network side equipment receives the capability information sent by the terminal;

the capability information comprises at least one codebook information for uplink transmission, which is supported by the terminal.

In the embodiment of the present application, by determining the indication mode of the TPMI in the DCI first, and then transmitting the indication information of the TPMI through the DCI based on the indication mode, the terminal determines the precoding matrix adopted when transmitting the uplink data according to the indication information of the TPMI, so that the indication of the TPMI can be accurately performed, the accurate determination of the precoding matrix adopted when transmitting the uplink data is ensured, and the accurate transmission of the uplink data is further ensured.

According to the precoding matrix determining method provided by the embodiment of the application, the executing body can be the precoding matrix determining device. In the embodiment of the present application, a precoding matrix determining device executes a precoding matrix determining method as an example, and the precoding matrix determining device provided in the embodiment of the present application is described.

As shown in fig. 4, a precoding matrix determining apparatus 400 in an embodiment of the present application is applied to a terminal, and includes:

a first receiving module 401, configured to receive downlink control information DCI sent by a network side device, where the DCI carries indication information of a transmission precoding index TPMI;

a first determining module 402, configured to determine, according to the indication information of the TPMI, a precoding matrix used in uplink data transmission.

a third precoding indication field for precoding matrix indication;

a fourth precoding indication field for indicating the phase information;

Optionally, in a case that the at least one precoding indication field includes a first precoding indication field for jointly performing transmission rank and precoding matrix indication, or the at least one precoding indication field includes a seventh precoding indication field indicating first part information and an eighth precoding indication field indicating second part information of one codebook, the first determining module 402 is configured to:

wherein the first mapping relation includes:

Optionally, in case the at least one precoding indication field includes a third precoding indication field for precoding matrix indication, the first determining module 402 is configured to:

Wherein the second mapping relationship includes:

Optionally, in a case that the at least one precoding indication field includes at least two fifth precoding indication fields for respectively performing precoding matrix indications corresponding to different codebooks, the first determining module 402 includes:

Further, in the case that the at least one precoding indication field further includes a second precoding indication field for performing transmission rank indication, the determining, by performing direct product operation on the precoding matrices indicated by the at least two fifth precoding indication fields, an implementation manner of the precoding matrix adopted in uplink data transmission includes:

Further, in the direct product operation result, the implementation manner of using the precoding vector with the same column number as the transmission rank indicated by the second precoding indication field as the precoding matrix adopted in uplink data transmission includes:

Optionally, the apparatus further comprises:

the second sending module is used for sending the capability information to the network side equipment;

Optionally, before the first receiving module 401 receives the downlink control information DCI sent by the network side device, the method further includes:

The second receiving module is configured to receive first information sent by the network side device through higher layer signaling, where the first information is used to indicate a first precoding matrix set that can be used by a terminal, and the first information includes at least one of the following: codebook type, information related to the codebook, transmission rank limit, codebook subset restriction CBSR.

Optionally, after the second receiving module receives the first information sent by the network side device through the higher layer signaling, the method further includes:

the third receiving module is configured to receive second information sent by the network side device through a media access control layer control unit MAC CE, where the second information is used to indicate a second precoding matrix set, and the second precoding matrix set is a subset of the first precoding matrix set.

Optionally, the second information includes at least one of:

a start index and a stop index of the precoding matrix;

at least one set of precoding matrix indicators;

bit map.

It should be noted that the embodiment of the apparatus corresponds to the method, and all implementation manners in the embodiment of the method are applicable to the embodiment of the apparatus, so that the same technical effects can be achieved.

The precoding matrix determining apparatus in the embodiments of the present application may be an electronic device, for example, an electronic device with an operating system, or may be a component in an electronic device, for example, an integrated circuit or a chip. The electronic device may be a terminal, or may be other devices than a terminal. By way of example, terminals may include, but are not limited to, the types of terminals 11 listed above, other devices may be servers, network attached storage (Network Attached Storage, NAS), etc., and embodiments of the application are not specifically limited.

The precoding matrix determining apparatus provided in the embodiment of the present application can implement each process implemented by the method embodiment of fig. 2, and achieve the same technical effects, so that repetition is avoided, and no further description is given here.

The embodiment of the application also provides a terminal, which comprises a processor and a communication interface, wherein the communication interface is used for receiving Downlink Control Information (DCI) sent by network side equipment, and the DCI carries indication information of a transmission precoding index (TPMI); the processor is configured to determine a precoding matrix used for uplink data transmission according to the indication information of the TPMI.

a third precoding indication field for precoding matrix indication;

a fourth precoding indication field for indicating the phase information;

Optionally, in a case that the at least one precoding indication field includes a first precoding indication field for jointly performing transmission rank and precoding matrix indication, or the at least one precoding indication field includes a seventh precoding indication field indicating first part information and an eighth precoding indication field indicating second part information of one codebook, the processor is configured to:

wherein the first mapping relation includes:

Optionally, in the case that the at least one precoding indication field includes a third precoding indication field for precoding matrix indication, the processor is configured to:

wherein the second mapping relationship includes:

Optionally, in a case that the at least one precoding indication field includes at least two fifth precoding indication fields for respectively performing precoding matrix indications corresponding to different codebooks, the processor is configured to:

Optionally, in case the at least one precoding indication field further comprises a second precoding indication field for transmission rank indication, the processor is configured to:

Optionally, the processor is configured to:

Optionally, the communication interface is configured to:

transmitting capability information to network side equipment;

Optionally, the communication interface is further configured to:

receiving first information sent by the network side equipment through a high-layer signaling, wherein the first information is used for indicating a first precoding matrix set which can be used by a terminal, and the first information comprises at least one of the following items: codebook type, information related to the codebook, transmission rank limit, codebook subset restriction CBSR.

Optionally, the communication interface is further configured to:

and receiving second information sent by the network side equipment through a Media Access Control (MAC) CE, wherein the second information is used for indicating a second precoding matrix set, and the second precoding matrix set is a subset of the first precoding matrix set.

Optionally, the second information includes at least one of:

a start index and a stop index of the precoding matrix;

at least one set of precoding matrix indicators;

bit map.

The terminal embodiment corresponds to the terminal-side method embodiment, and each implementation process and implementation manner of the method embodiment can be applied to the terminal embodiment, and the same technical effects can be achieved. Specifically, fig. 5 is a schematic hardware structure of a terminal for implementing an embodiment of the present application.

The terminal 500 includes, but is not limited to: at least some of the components of the radio frequency unit 501, the network module 502, the audio output unit 503, the input unit 504, the sensor 505, the display unit 506, the user input unit 507, the interface unit 508, the memory 509, and the processor 510.

Those skilled in the art will appreciate that the terminal 500 may further include a power source (e.g., a battery) for powering the various components, and the power source may be logically coupled to the processor 510 via a power management system so as to perform functions such as managing charging, discharging, and power consumption via the power management system. The terminal structure shown in fig. 5 does not constitute a limitation of the terminal, and the terminal may include more or less components than shown, or may combine certain components, or may be arranged in different components, which will not be described in detail herein.

It should be appreciated that in embodiments of the present application, the input unit 504 may include a graphics processing unit (Graphics Processing Unit, GPU) 5041 and a microphone 5042, with the graphics processor 5041 processing image data of still pictures or video obtained by an image capturing device (e.g., a camera) in a video capturing mode or an image capturing mode. The display unit 506 may include a display panel 5061, and the display panel 5061 may be configured in the form of a liquid crystal display, an organic light emitting diode, or the like. The user input unit 507 includes at least one of a touch panel 5071 and other input devices 5072. Touch panel 5071, also referred to as a touch screen. Touch panel 5071 may include two parts, a touch detection device and a touch controller. Other input devices 5072 may include, but are not limited to, a physical keyboard, function keys (e.g., volume control keys, switch keys, etc.), a trackball, a mouse, a joystick, and so forth, which are not described in detail herein.

In this embodiment, after receiving downlink data from the network side device, the radio frequency unit 501 may transmit the downlink data to the processor 510 for processing; in addition, the radio frequency unit 501 may send uplink data to the network side device. Typically, the radio frequency unit 501 includes, but is not limited to, an antenna, an amplifier, a transceiver, a coupler, a low noise amplifier, a duplexer, and the like.

The memory 509 may be used to store software programs or instructions as well as various data. The memory 509 may mainly include a first storage area storing programs or instructions and a second storage area storing data, wherein the first storage area may store an operating system, application programs or instructions (such as a sound playing function, an image playing function, etc.) required for at least one function, and the like. Further, the memory 509 may include volatile memory or nonvolatile memory, or the memory 509 may include both volatile and nonvolatile memory. The nonvolatile Memory may be a Read-Only Memory (ROM), a Programmable ROM (PROM), an Erasable PROM (EPROM), an Electrically Erasable EPROM (EEPROM), or a flash Memory. The volatile memory may be random access memory (Random Access Memory, RAM), static RAM (SRAM), dynamic RAM (DRAM), synchronous DRAM (SDRAM), double Data Rate SDRAM (ddr SDRAM), enhanced SDRAM (Enhanced SDRAM), synchronous DRAM (SLDRAM), and Direct RAM (DRRAM). Memory 509 in embodiments of the present application includes, but is not limited to, these and any other suitable types of memory.

Processor 510 may include one or more processing units; optionally, the processor 510 integrates an application processor that primarily processes operations involving an operating system, user interface, application programs, etc., and a modem processor that primarily processes wireless communication signals, such as a baseband processor. It will be appreciated that the modem processor described above may not be integrated into the processor 510.

Wherein, the radio frequency unit 501 is configured to:

receiving Downlink Control Information (DCI) sent by network side equipment, wherein the DCI carries indication information of a transmission precoding index (TPMI);

the processor 510 is configured to: and determining a precoding matrix adopted when uplink data transmission is carried out according to the indication information of the TPMI.

a third precoding indication field for precoding matrix indication;

A fourth precoding indication field for indicating the phase information;

Optionally, in a case that the at least one precoding indication field includes a first precoding indication field for jointly performing transmission rank and precoding matrix indication, or the at least one precoding indication field includes a seventh precoding indication field indicating first part information and an eighth precoding indication field indicating second part information of one codebook, the processor 510 is configured to:

wherein the first mapping relation includes:

Optionally, in case the at least one precoding indication field includes a third precoding indication field for precoding matrix indication, the processor 510 is configured to:

wherein the second mapping relationship includes:

Optionally, in a case that the at least one precoding indication field includes at least two fifth precoding indication fields for respectively performing precoding matrix indications corresponding to different codebooks, the processor 510 is configured to:

Optionally, the processor is configured to:

Optionally, the radio frequency unit 501 is further configured to:

transmitting capability information to network side equipment;

Optionally, the radio frequency unit 501 is further configured to:

Optionally, the second information includes at least one of:

a start index and a stop index of the precoding matrix;

at least one set of precoding matrix indicators;

bit map.

Preferably, the embodiment of the present application further provides a terminal, including a processor, a memory, and a program or an instruction stored in the memory and capable of running on the processor, where the program or the instruction implements each process of the above embodiment of the method for determining a precoding matrix when executed by the processor, and the process can achieve the same technical effect, so that repetition is avoided, and no redundant description is given here.

The embodiment of the application further provides a readable storage medium, on which a program or an instruction is stored, where the program or the instruction implements each process of the above embodiment of the method for determining a precoding matrix when executed by a processor, and the same technical effects can be achieved, so that repetition is avoided, and no further description is given here.

Wherein the computer readable storage medium is selected from Read-Only Memory (ROM), random access Memory (Random Access Memory, RAM), magnetic disk or optical disk.

As shown in fig. 6, the embodiment of the present application further provides a precoding matrix indicator 600, which is applied to a network device and includes:

a second determining module 601, configured to determine an indication manner of a transmission precoding index TPMI in downlink control information DCI;

a first sending module 602, configured to send DCI to a terminal according to the indication manner, where the DCI carries indication information of TPMI.

Optionally, the second determining module 601 is configured to:

and determining the indication mode of the TPMI in the DCI according to the codebook type corresponding to the codebook configured for the terminal, the information related to the codebook and the value of the supported transmission rank.

Optionally, before the first sending module 602 sends DCI to a terminal according to the indication manner, the apparatus further includes:

a configuration module, configured to configure first information through higher layer signaling, where the first information is used to indicate a first precoding matrix set that can be used by a terminal, and the first information includes at least one of the following: codebook type, information related to the codebook, transmission rank limit, codebook subset restriction CBSR.

Optionally, after the configuration module configures the first information through higher layer signaling, the method further includes:

and the third sending module is used for sending second information to the terminal through a Media Access Control (MAC) CE, wherein the second information is used for indicating a second precoding matrix set, and the second precoding matrix set is a subset of the first precoding matrix set.

Optionally, the second information includes at least one of:

a start index and a stop index of the precoding matrix;

at least one set of precoding matrix indicators;

bit map.

a third precoding indication field for precoding matrix indication;

a fourth precoding indication field for indicating the phase information;

Optionally, the apparatus further comprises:

a fourth receiving module, configured to receive capability information sent by the terminal;

It should be noted that, the embodiment of the apparatus is an apparatus corresponding to the above method, and all implementation manners in the embodiment of the method are applicable to the embodiment of the apparatus, so that the same technical effects can be achieved, which is not described herein again.

The embodiment of the application also provides a network side device, which comprises a processor and a communication interface, wherein the processor is used for determining an indication mode of a transmission precoding index (TPMI) in Downlink Control Information (DCI);

The communication interface is configured to send DCI to the terminal according to the indication manner, where the DCI carries indication information of TPMI.

Optionally, the processor is configured to:

Optionally, the communication interface is further configured to:

configuring first information through high-layer signaling, wherein the first information is used for indicating a first precoding matrix set which can be used by a terminal, and the first information comprises at least one of the following: codebook type, information related to the codebook, transmission rank limit, codebook subset restriction CBSR.

Optionally, the communication interface is further configured to:

and sending second information to the terminal through a Media Access Control (MAC) control unit (CE), wherein the second information is used for indicating a second precoding matrix set, and the second precoding matrix set is a subset of the first precoding matrix set.

Optionally, the second information includes at least one of:

a start index and a stop index of the precoding matrix;

at least one set of precoding matrix indicators;

bit map.

a third precoding indication field for precoding matrix indication;

a fourth precoding indication field for indicating the phase information;

Optionally, the communication interface is configured to:

receiving capability information sent by the terminal;

Preferably, the embodiment of the present application further provides a network side device, which includes a processor, a memory, and a program or an instruction stored in the memory and capable of running on the processor, where the program or the instruction implements each process of the foregoing precoding matrix indication method embodiment when executed by the processor, and the process can achieve the same technical effect, so that repetition is avoided, and no redundant description is provided herein.

Specifically, the embodiment of the application also provides network side equipment. As shown in fig. 7, the network side device 700 includes: an antenna 701, a radio frequency device 702, a baseband device 703, a processor 704 and a memory 705. The antenna 701 is connected to a radio frequency device 702. In the uplink direction, the radio frequency device 702 receives information via the antenna 701, and transmits the received information to the baseband device 703 for processing. In the downlink direction, the baseband device 703 processes information to be transmitted, and transmits the processed information to the radio frequency device 702, and the radio frequency device 702 processes the received information and transmits the processed information through the antenna 701.

The method performed by the network-side device in the above embodiment may be implemented in the baseband apparatus 703, where the baseband apparatus 703 includes a baseband processor.

The baseband apparatus 703 may, for example, include at least one baseband board, where a plurality of chips are disposed on the baseband board, as shown in fig. 7, where one chip, for example, a baseband processor, is connected to the memory 705 through a bus interface, so as to call a program in the memory 705, and execute the network side device operation shown in the foregoing method embodiment.

The network-side device may also include a network interface 706, such as a common public radio interface (common public radio interface, CPRI).

Specifically, the network side device 700 of the embodiment of the present invention further includes: instructions or programs stored in the memory 705 and executable on the processor 704, the processor 704 invokes the instructions or programs in the memory 705 to perform the methods performed by the modules shown in fig. 6 and achieve the same technical effects, and are not described herein in detail to avoid 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, each process of the foregoing precoding matrix indication method embodiment is implemented, and the same technical effects can be achieved, so that repetition is avoided, and no further description is given here.

The processor is a processor in the network side device described in the foregoing embodiment. The readable storage medium includes computer readable storage medium such as computer readable memory ROM, random access memory RAM, magnetic or optical disk, etc.

Optionally, as shown in fig. 8, the embodiment of the present application further provides a communication device 800, including a processor 801 and a memory 802, where a program or an instruction that can be executed on the processor 801 is stored in the memory 802, for example, when the communication device 800 is a terminal, the program or the instruction is executed by the processor 801 to implement each step of the foregoing precoding matrix determining method embodiment, and the same technical effect can be achieved. When the communication device 800 is a network side device, the program or the instruction, when executed by the processor 801, implements the steps of the foregoing precoding matrix indicating method embodiment, and the same technical effects can be achieved, so that repetition is avoided, and no further description is given here.

The embodiment of the application further provides a chip, where the chip includes a processor and a communication interface, where the communication interface is coupled to the processor, where the processor is configured to run a program or an instruction, implement each process of the foregoing precoding matrix determining method or the precoding matrix indicating method embodiment, and achieve the same technical effect, so that repetition is avoided, and no further description is given here.

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

The embodiments of the present application further provide a computer program/program product, where the computer program/program product is stored in a storage medium, and the computer program/program product is executed by at least one processor to implement each process of the foregoing precoding matrix determining method or the precoding matrix indicating method embodiment, and the same technical effects can be achieved, so that repetition is avoided, and details are not repeated here.

The embodiment of the application also provides a communication system, which comprises: the terminal can be used for executing the steps of the precoding matrix determining method, and the network side equipment can be used for executing the steps of the precoding matrix indicating method.

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 one … …" does not exclude the presence of other like elements in a process, method, article, or apparatus that comprises the element. Furthermore, it should be noted that the scope of the methods and apparatus in the embodiments of the present application is not limited to performing the functions in the order shown or discussed, but may also include performing the functions in a substantially simultaneous manner or in an opposite order depending on the functions involved, e.g., the described methods may be performed in an order different from that described, and various steps may also be added, omitted, or combined. Additionally, features described with reference to certain examples may be combined in other examples.

From the above description of the embodiments, it will be clear to those skilled in the art that the above-described embodiment method may be implemented by means of software plus a necessary general hardware platform, but of course may also be implemented by means of hardware, but in many cases the former is a preferred embodiment. Based on such understanding, the technical solutions of the present application may be embodied essentially or in a part contributing to the prior art in the form of a computer software product stored in a storage medium (such as ROM/RAM, magnetic disk, optical disk), comprising several instructions for causing a terminal (which may be a mobile phone, a computer, a server, an air conditioner, or a network device, etc.) to perform the method described in the embodiments of the present application.

The embodiments of the present application have been described above with reference to the accompanying drawings, but the present application is not limited to the above-described embodiments, which are merely illustrative and not restrictive, and many forms may be made by those of ordinary skill in the art without departing from the spirit of the present application and the scope of the claims, which are also within the protection of the present application.

Claims

1. A precoding matrix indicating method, comprising:

2. The method of claim 1, wherein the determining, by the network side device, an indication manner of the transmission precoding index TPMI in the downlink control information DCI includes:

3. The method according to claim 1, wherein before the network side device sends DCI to a terminal according to the indication manner, the method further comprises:

4. A method according to claim 3, further comprising, after the network side device configures the first information by higher layer signaling:

5. The method of claim 4, wherein the second information comprises at least one of:

a start index and a stop index of the precoding matrix;

at least one set of precoding matrix indicators;

bit map.

6. The method of claim 1, wherein the indication information of the TPMI is indicated by at least one precoding indication field.

7. The method of claim 6, wherein the at least one precoding indication field comprises at least one of:

a third precoding indication field for precoding matrix indication;

A fourth precoding indication field for indicating the phase information;

8. The method of claim 7, wherein the first mapping relationship of TPMI and precoding matrix comprises, in a case where the at least one precoding indication field comprises a first precoding indication field that jointly performs transmission rank and precoding matrix indication, or the at least one precoding indication field comprises a seventh precoding indication field that indicates a first portion of information and an eighth precoding indication field that indicates a second portion of information of a codebook:

9. The method of claim 7, wherein, in the case that the at least one precoding indication field includes a third precoding indication field for precoding matrix indication, the second mapping relationship of TPMI and precoding matrix comprises:

10. The method according to claim 7, wherein in the case that the at least one precoding indication field includes at least two fifth precoding indication fields for respectively indicating precoding matrices corresponding to different codebooks and a second precoding indication field for indicating a transmission rank, the transmission rank indicated by the second precoding indication field is smaller than or equal to the number of transmission layers supportable by a direct product operation result of the direct product operation performed by the precoding matrices indicated by the at least two fifth precoding indication fields.

11. The method as recited in claim 1, further comprising:

12. A method for determining a precoding matrix, comprising:

13. The method of claim 12, wherein the indication information of the TPMI is indicated by at least one precoding indication field.

14. The method of claim 13, wherein the at least one precoding indication field comprises at least one of:

a third precoding indication field for precoding matrix indication;

a fourth precoding indication field for indicating the phase information;

15. The method of claim 14, wherein, in a case where the at least one precoding indication field includes a first precoding indication field for jointly performing transmission rank and precoding matrix indication, or the at least one precoding indication field includes a seventh precoding indication field for indicating first part information and an eighth precoding indication field for indicating second part information of one codebook, the determining, by the terminal, a precoding matrix to be used in performing uplink data transmission according to the indication information of the TPMI includes:

wherein the first mapping relation includes:

16. The method of claim 14, wherein, in a case where the at least one precoding indication field includes a third precoding indication field for indicating a precoding matrix, the determining, by the terminal, the precoding matrix used for uplink data transmission according to the indication information of the TPMI includes:

wherein the second mapping relationship includes:

17. The method of claim 14, wherein, in a case where the at least one precoding indication field includes at least two fifth precoding indication fields for respectively indicating precoding matrices corresponding to different codebooks, the determining, by the terminal, a precoding matrix to be used in uplink data transmission according to the indication information of the TPMI includes:

18. The method of claim 17, wherein, in the case where the at least one precoding indication field further includes a second precoding indication field for performing transmission rank indication, the determining the precoding matrix used for uplink data transmission by performing a direct product operation on the precoding matrices indicated by the at least two fifth precoding indication fields includes:

19. The method of claim 18, wherein the taking, as the precoding matrix used for uplink data transmission, a precoding vector of the same number of columns as the transmission rank indicated by the second precoding indication field in the direct product result, includes:

20. The method as recited in claim 12, further comprising:

the terminal sends capability information to network side equipment;

21. The method according to claim 12, further comprising, before the terminal receives the downlink control information DCI sent by the network side device:

The terminal receives first information sent by the network side device through a high-layer signaling, wherein the first information is used for indicating a first precoding matrix set which can be used by the terminal, and the first information comprises at least one of the following items: codebook type, information related to the codebook, transmission rank limit, codebook subset restriction CBSR.

22. The method according to claim 21, further comprising, after the terminal receives the first information sent by the network side device through higher layer signaling:

the terminal receives second information sent by the network side equipment through a media access control layer control unit (MAC CE), wherein the second information is used for indicating a second precoding matrix set, and the second precoding matrix set is a subset of the first precoding matrix set.

23. The method of claim 22, wherein the second information comprises at least one of:

a start index and a stop index of the precoding matrix;

at least one set of precoding matrix indicators;

bit map.

24. A precoding matrix determining apparatus applied to a terminal, comprising:

25. A precoding matrix indicator device applied to a network side device, comprising:

26. A terminal comprising a processor and a memory storing a program or instructions executable on the processor, which when executed by the processor, performs the steps of the precoding matrix determination method as claimed in any one of claims 12 to 23.

27. A network side device comprising a processor and a memory storing a program or instructions executable on the processor, which when executed by the processor, implement the steps of the precoding matrix indicating method of any of claims 1 to 11.

28. A readable storage medium, characterized in that a program or instructions is stored on the readable storage medium, which when executed by a processor, implements the steps of the precoding matrix indication method according to any one of claims 1 to 11 or the steps of the precoding matrix determination method according to any one of claims 12 to 23.