WO2024007918A1

WO2024007918A1 - Precoding matrix indication method and apparatus, precoding matrix determination method and apparatus, and network-side device and terminal

Info

Publication number: WO2024007918A1
Application number: PCT/CN2023/103278
Authority: WO
Inventors: 塔玛拉卡拉盖施; 吴昊; 刘昊; 袁江伟
Original assignee: 维沃移动通信有限公司
Priority date: 2022-07-04
Filing date: 2023-06-28
Publication date: 2024-01-11
Also published as: CN117411522A

Abstract

The present application belongs to the technical field of communications. Disclosed are a precoding matrix indication method and apparatus, a precoding matrix determination method and apparatus, and a network-side device and a terminal. The precoding matrix indication method in the embodiments of the present application comprises: a network-side device determining an indication mode of a transmit precoding matrix indicator (TPMI) in downlink control information (DCI); and the network-side device sending the DCI to a terminal according to the indication mode, wherein the DCI carries indication information of the TPMI.

Description

Precoding matrix indication, determination method, device, network side equipment and terminal

Cross-references to related applications

This application claims priority from Chinese Patent Application No. 202210786968.6 filed in China on July 4, 2022, the entire content of which is incorporated herein by reference.

Technical field

This application belongs to the field of communication technology, and specifically relates to a precoding matrix indication, determination method, device, network side equipment and terminal.

Background technique

Enhanced uplink (Uplink, UL) multiple-input multiple-output (Multiple-Input Multiple-Output, MIMO) will support multiple codebooks, such as: 4-antenna codebook based on Release-15 (Release-15, Rel-15) Construct an 8-antenna codebook or a codebook based on Discrete Fourier Transform (DFT) vectors such as the Rel-15 downlink codebook. The codebooks supported by different terminal capabilities are also different. The terminal reports the capability to the base station to indicate the type of codebooks it supports. A terminal with strong capabilities may support multiple codebooks. The base station configures the one supported by the terminal through high-level signaling. Codebook. In the UL MIMO system, the precoding matrix used by the base station to instruct the terminal to transmit uplink data is called the Transmit Precoding Matrix Indicator (TPMI). However, in the existing technology, there is no clear technical solution on how to indicate TPMI and how to determine the precoding matrix used for uplink data transmission.

Contents of the invention

Embodiments of the present application provide a precoding matrix indication, determination method, device, network side equipment and terminal, which can realize the indication of TPMI and the determination of the precoding matrix used in uplink data transmission.

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

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

The terminal determines the precoding matrix used for uplink data transmission according to the indication information of the TPMI.

In the second aspect, a precoding matrix determination device is provided, which is applied to a terminal and includes:

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

The first determination module is configured to determine the precoding matrix used for uplink data transmission according to the indication information of the TPMI.

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

The network side device determines the indication method of the transmission precoding index TPMI in the downlink control information DCI;

The network side device sends DCI to the terminal according to the indication method, and the DCI carries TPMI indication information.

In the fourth aspect, a precoding matrix indication device is provided, applied to network side equipment, including:

The second determination module is used to determine the indication mode of the transmission precoding index TPMI in the downlink control information DCI;

The first sending module is configured to send DCI to the terminal according to the indication method, where the DCI carries indication information of TPMI.

In a fifth aspect, a terminal is provided. The terminal includes a processor and a memory. The memory stores programs or instructions that can be run on the processor. When the program or instructions are executed by the processor, the following implementations are implemented: The steps of the method described in one aspect.

In a sixth aspect, a terminal is provided, including a processor and a communication interface, wherein the communication interface is used to receive downlink control information DCI sent by a network side device, 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.

In a seventh aspect, a network side device is provided. The network side device includes a processor and a memory. The memory stores programs or instructions that can be run on the processor. The program or instructions are executed by the processor. When implementing the steps of the method described in the third aspect.

In an eighth aspect, a network side device is provided, including a processor and a communication interface, wherein the processor is used to determine the indication mode of the transmission precoding index TPMI in the downlink control information DCI; the communication interface is used to determine the indication method according to the In the above indication method, DCI is sent to the terminal, and the DCI carries TPMI indication information.

A ninth aspect provides a communication system, including: a terminal and a network side device. The terminal can be used to perform the steps of the precoding matrix determination method as described in the first aspect. The network side device can be used to perform the steps of the precoding matrix determination method as described in the first aspect. The steps of the precoding matrix indication method described in the three aspects.

In a tenth aspect, a readable storage medium is provided. Programs or instructions are stored on the readable storage medium. When the programs or instructions are executed by a processor, the steps of the method described in the first aspect are implemented, or the steps of the method are implemented as described in the first aspect. The steps of the method described in the third aspect.

In an eleventh aspect, a chip is provided. The chip includes a processor and a communication interface. The communication interface is coupled to the processor. The processor is used to run programs or instructions to implement the method described in the first aspect. method, or implement a method as described in the third aspect.

In a twelfth aspect, a computer program/program product is provided, 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 the first aspect or the second aspect. The steps of the method described in three aspects.

In the embodiment of the present application, by first determining the indication mode of TPMI in DCI, and then sending the indication information of TPMI through DCI based on the indication mode, the terminal determines the instructions for uplink data transmission based on the indication information of TPMI. The precoding matrix adopted can accurately perform TPMI instructions and ensure uplink data transmission. Accurately determine the precoding matrix used to ensure accurate transmission of uplink data.

Description of the drawings

Figure 1 is a block diagram of a wireless communication system applicable to the embodiment of the present application;

Figure 2 is a schematic flowchart of a method for determining a precoding matrix according to an embodiment of the present application;

Figure 3 is a schematic flowchart of a precoding matrix indication method according to an embodiment of the present application;

Figure 4 is a schematic module diagram of a precoding matrix determination device according to an embodiment of the present application;

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

Figure 6 is a schematic module diagram of a precoding matrix indication device according to an embodiment of the present application;

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

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

Detailed ways

The technical solutions in the embodiments of the present application will be clearly described below with reference to the accompanying drawings in the embodiments of the present application. Obviously, the described embodiments are part of the embodiments of the present application, but not all of the embodiments. Based on the embodiments in this application, all other embodiments obtained by those of ordinary skill in the art fall within the scope of protection of this application.

The terms "first", "second", etc. in the description and claims of this application are used to distinguish similar objects and are not used to describe a specific order or sequence. It is to be understood that the terms so used are interchangeable under appropriate circumstances so that the embodiments of the present application can be practiced in sequences other than those illustrated or described herein, and that "first" and "second" are distinguished objects It is usually one type, and the number of objects is not limited. For example, the first object can be one or multiple. In addition, "and/or" in the description and claims indicates at least one of the connected objects, and the character "/" generally indicates that the related objects are in an "or" relationship.

It is worth pointing out that the technology described in the embodiments of this application is not limited to Long Term Evolution (LTE)/LTE Evolution (LTE-Advanced, LTE-A) systems, and can also be used in other wireless communication systems, such as code Code Division Multiple Access (CDMA), Time Division 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" in the embodiments of this application are often used interchangeably, and the described technology can be used not only for the above-mentioned systems and radio technologies, but also for other systems and radio technologies. The following description describes a New Radio (NR) system for example purposes, and NR terminology is used in much of the following description, but these techniques can also be applied to applications other than NR system applications, such as 6th ^generation Generation, 6G) communication system.

Figure 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 side device 12. Among them, the terminal 11 can be a mobile phone, a tablet computer (Tablet Personal Computer), a laptop Laptop Computer, also known as notebook computer, Personal Digital Assistant (PDA), handheld computer, netbook, ultra-mobile personal computer (UMPC), Mobile Internet Device , MID), augmented reality (AR)/virtual reality (VR) equipment, robots, wearable devices (Wearable Devices), vehicle user equipment (VUE), pedestrian terminals (Pedestrian User Equipment) , PUE), smart home (home equipment with wireless communication functions, such as refrigerators, TVs, washing machines or furniture, etc.), game consoles, personal computers (PC), teller machines or self-service machines and other terminal-side devices, wearable Equipment includes: smart watches, smart bracelets, smart headphones, smart glasses, smart jewelry (smart bracelets, smart bracelets, smart rings, smart necklaces, smart anklets, smart anklets, etc.), smart wristbands, smart clothing, etc. 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 include an access network device or a core network device, where the access network device may also be called a radio access network device, a radio access network (Radio Access Network, RAN), a radio access network function or a wireless access network unit. Access network equipment may include base stations, Wireless Local Area Networks (WLAN) access points or WiFi nodes, etc. The base stations may be called Node B, Evolved Node B (eNB), access point, base transceiver station ( Base Transceiver Station (BTS), radio base station, radio transceiver, Basic Service Set (BSS), Extended Service Set (ESS), home B-node, home evolved B-node, transmitting and receiving point ( Transmitting Receiving Point (TRP) or some other appropriate terminology in the field, as long as the same technical effect is achieved, the base station is not limited to specific technical terms. It should be noted that in the embodiment of this application, only in the NR system The base station is introduced as an example, and the specific type of base station is not limited.

The precoding matrix indication, determination method, device, network side equipment and terminal provided by the embodiments of the present application will be described in detail below with reference to the accompanying drawings through some embodiments and application scenarios.

As shown in Figure 2, this embodiment of the present application provides a method for determining a precoding matrix, which includes:

Step 201: The terminal receives downlink control information (DCI) sent by the network side device. The DCI carries indication information of the transmission precoding index (Transmit Precoding Matrix Indicator, TPMI);

Step 202: The terminal determines the precoding matrix used for uplink data transmission according to the indication information of the TPMI.

It should be noted that the downlink control information DCI carrying the indication information of TPMI is instructed to the terminal through the network side device, and the precoding matrix used for uplink data transmission is determined based on the indication information of TPMI, so that the transmission can be carried out accurately. The determination of the precoding matrix used in uplink data transmission ensures accurate transmission of uplink data.

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

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

A11. Jointly perform transmission rank and the first precoding indication field for precoding matrix indication;

A12. The second precoding indication field for transmission rank indication;

A13. The third precoding indication field for precoding matrix indication;

A14. The fourth precoding indication field for indicating phase information;

A15. Perform at least two fifth precoding indication fields for indicating precoding matrices corresponding to different codebooks;

A16. The sixth precoding indication field that jointly indicates transmission rank and phase information;

A17. The seventh precoding indication field indicating the first part of information and the eighth precoding indication field of the second part of information of a codebook. The first part of information and the second part of information are used to determine the precoding matrix in the codebook.

A18. At least two ninth precoding indication fields corresponding to the precoding matrix indication of the same codebook.

It should be noted that the at least one precoding indication field can be divided into the following situations.

Case 1: DCI only includes one precoding indication field

In this case, the DCI usually includes a first precoding indication field that jointly indicates the transmission rank and precoding matrix.

Case 2: DCI includes two precoding indication fields

Optionally, in this case, it can be divided into the following forms of expression:

Expression form 1: a second precoding indication field for indicating transmission rank and a third precoding indication field for indicating precoding matrix;

Expression 2: Two ninth precoding indication fields 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.

Expression form three: two fifth precoding indication fields for indicating precoding matrices corresponding to different codebooks;

Expression form four: a third precoding indication field for indicating the precoding matrix and a sixth precoding indication field for jointly indicating the transmission rank and phase information.

Expression 5: jointly perform the first precoding indication field for indicating the transmission rank and precoding matrix and the fourth precoding indication field for indicating the phase information;

Expression form 6: The seventh precoding indication field indicating the first part of information of a codebook and the eighth precoding indication field of the second part of information;

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

Case 3: DCI includes three precoding indication fields

Expression form 1: a second precoding indication field for indicating transmission rank, a third precoding indication field for indicating precoding matrix, and a fourth precoding indication field for indicating phase information;

Expression 2: a second precoding indication field for indicating transmission rank and at least two ninth precoding indication fields corresponding to a precoding matrix indication of the same codebook;

Expression form three: a second precoding indication field for indicating transmission rank, and two fifth precoding indication fields for indicating precoding matrices corresponding to different codebooks;

Expression form four: a second precoding indication field for indicating transmission rank, a seventh precoding indication field for indicating the first part of information of a codebook, and an eighth precoding indication field for indicating the second part of information.

What needs to be explained here is that before the network side device sends DCI, it needs to first determine the TPMI in the DCI. The indication method is used to constrain how many precoding indication fields are carried in the DCI, and the specific content indicated by each precoding indication field. That is to say, the indication method specifically refers to at least one precoding indication field. The included content, that is, the indication information used by the indication method to indicate TPMI is indicated through at least one of A11 to A18; after determining the indication method of TPMI, the network side device sends DCI to the terminal according to the indication method. Further, the network side device needs to determine the indication method of TPMI in the DCI based on the codebook type corresponding to the codebook configured for the terminal, information related to the codebook, and the value of the supported transmission rank; it is required It should be noted that the codebook types include Type I single panel codebook, Type I multi panel codebook, Type II codebook, enhanced eType II codebook, etc.; the information related to the codebook may include the number of antennas ( For example, the number of horizontal antennas N1, the number of vertical antennas N2), the oversampling factor of the Discrete Fourier Transform (DFT) vector (the oversampling factor O1 of the N1 dimension, the oversampling factor O2 of the N2 dimension), Codebook Subset Restriction (CBSR), etc.

It should also be noted that before the terminal transmits DCI to the network-side device, the network-side device can also configure first information through high-level signaling. The first information is used to indicate the first set of precoding matrices that the terminal can use, so The first information includes at least one of the following: codebook type, information related to the codebook, transmission rank limit, and CBSR.

It should be noted that after the terminal obtains the first information of the high-level signaling configuration, it can determine the specific precoding matrices that the terminal can use. Currently, in some cases, not all precoding matrices may be used by the terminal. Use, at this time, the network side device can send second information to the terminal through the Media Access Control Layer Control Unit (MAC CE), the second information is used to indicate the second precoding matrix set, the The second precoding matrix set is a subset of the first precoding matrix set, that is, the high-level signaling configuration is a total precoding matrix set. The range of the precoding matrix set that can be used can be further narrowed through MAC CE. Furthermore, DCI indicates a precoding matrix within a small range, which can reduce the overhead of the indication domain in DCI. For example, precoding matrix 1 to precoding matrix 100 are configured through high-level signaling, and then the MAC CE is used to indicate that the specific precoding matrices that can be used are precoding matrix 50 to precoding matrix 80. Finally, the final determination is made through the TPMI carried in the DCI. The precoding matrix used for uplink transmission is precoding matrix 76.

Further, the second information includes at least one of the following: B11, the start index and the end index of the precoding matrix; B12, at least one group of precoding matrix indications; B13, the bit map.

Optionally, in order to ensure that the network side device can accurately configure the precoding matrix that can be used by the terminal, the terminal can also send capability information to the network side device. The capability information includes at least one supported by the terminal for uplink transmission. Codebook information. Optionally, the codebook information may include codebook type, antenna architecture, codebook-related information, and supported transmission rank values.

The specific implementation method of determining the precoding matrix used for uplink data transmission according to the TPMI indication information is described below.

Case 1: The at least one precoding indication field includes a first precoding indication field that jointly indicates the transmission rank and precoding matrix, or the at least one precoding indication field includes a seventh precoding indication field that indicates the first part of information of a codebook. Coding indication field and the eighth precoding indication field of the second part of information

Optionally, in this case, the terminal determines the implementation method of the precoding matrix used for uplink data transmission according to the indication information of the TPMI, including:

According to the first mapping relationship between the TPMI and the precoding matrix, determine the precoding matrix used in uplink data transmission corresponding to the indication information of the TPMI;

Wherein, the first mapping relationship includes:

According to the sorting of transmission ranks, the precoding matrices corresponding to the same codebook under the same transmission rank are sorted respectively, and the precoding matrices are corresponding to the TPMI according to the sorting order.

That is to say, in this case, the transmission rank and the precoding matrix corresponding to the same codebook are uniformly sorted. For example, the values of the transmission rank are 1 and 2, and the precoding matrix includes precoding matrix 1 to precoding matrix 10. ; Then when sorting, you need to first sort the 10 precoding matrices corresponding to the case where the transmission rank is 1, and then sort the 10 precoding matrices corresponding to the case where the transmission rank is 2, and then perform the precoding matrices based on the overall sorting Mapping to TPMI.

Optionally, this mapping method may be adopted in case one, expression form five, expression form six in case two, and expression form four in case three of the above-mentioned division of at least one precoding indication domain.

Case 2: The at least one precoding indication field includes a third precoding indication field for indicating a precoding matrix.

According to the second mapping relationship between the TPMI and the precoding matrix, determine the precoding matrix used in uplink data transmission corresponding to the indication information of the TPMI;

Wherein, the second mapping relationship includes the following:

C11. Sort the precoding matrices corresponding to the same codebook under the same transmission rank, and correspond the precoding matrices under the same transmission rank to TPMI in the sorting order;

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

C12. Unify the precoding matrices corresponding to the same codebook under all transmission ranks, and map the precoding matrices to TPMI in the sorting order;

It should be noted that in this case, the transmission rank and the precoding matrix are jointly sorted, and then the precoding matrix and TPMI are mapped based on the overall sorting.

Optionally, in the above-mentioned division of at least one precoding indication domain, the expression form 1 in case 2, the expression form 4, and the expression form 1 in case 3 can all adopt this mapping method.

Case 3: The at least one precoding indication field includes at least two fifth precoding indication fields that respectively indicate precoding matrices corresponding to different codebooks.

By performing a direct product operation on at least two precoding matrices indicated by the fifth precoding indication field, it is determined that the uplink The precoding matrix used for data transmission.

Optionally, in the above-mentioned division of at least one precoding indication domain, the third expression in case two and the third expression in case three can be used to obtain the precoding matrix in this manner.

Further, in the case where the at least one precoding indication field further includes a second precoding indication field for indicating transmission rank, the transmission rank indicated by the second precoding indication field is less than or equal to at least two fifth The number of transmission layers that can be supported by the direct product operation result of the precoding matrix indicated by the precoding indication field; optionally, the precoding matrix indicated by at least two fifth precoding indication fields is Direct product operation is used to determine the precoding matrix used for uplink data transmission as follows:

When the transmission rank indicated by the second precoding indication field is less than the number of transmission layers that can be supported by the direct product operation result, the direct product operation result will be the same as the transmission rank indicated by the second precoding indication field. Precoding vectors with the same rank and number of columns are used as the precoding matrix used for uplink data transmission.

Optionally, in the direct product operation result, the precoding vector with the same number of columns as the transmission rank indicated by the second precoding indication field is used as the precoding matrix used for uplink data transmission: :

Use the precoding vectors of the first or last N columns in the direct product budget result as the precoding matrix used for uplink data transmission;

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

Case 4: The at least one precoding indication field includes at least two ninth precoding indication fields corresponding to the precoding matrix indication of the same codebook.

Optionally, in this case, two precoding matrices are respectively indicated. Specifically, in this case, the terminal determines the precoding matrix used for uplink data transmission according to the indication information of the TPMI. Implementation methods include:

Perform a direct product operation on the precoding matrices indicated by at least two ninth precoding indication fields corresponding to the precoding matrix indications of the same codebook to determine the precoding matrix used for uplink data transmission.

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

Optionally, the above-mentioned expression form 2 in case 2 and expression form 2 in case 3 may adopt this method of determining the precoding matrix used for uplink data transmission.

Taking the communication between the terminal and the base station as an example, the specific application of this application is described in detail as follows.

Specific application situation 1. The terminal supports the DFT-based Type I codebook, and the base station configures the DFT-based Type I codebook for the terminal. The control signaling DCI contains a precoding indication field, which is jointly transmitted. Rank and precoding matrix indication. The mapping relationship between TPMI and specific precoding matrix indicated by this indication field is as follows:

It should be noted that since the value of the transmission rank is usually represented by the transmission rank identifier (RI), and the precoding matrix used for upload transmission is represented by the TPMI, that is to say, the indication field jointly indicates the RI and the TPMI. The optional transmission rank values include X {r ₁ , _r ₂ , _... , _r When TPMI optional values include Y _n (i _n,0 is the value of the first TPMI corresponding to the value of the nth transmission rank; for example, determined based on N1, N2, O1, O2 or CBSR, etc.), then The value i indicated by the indication field (i ranges from 0 to ) maps to where n ₀ satisfies (where Y ₀ =0), or n ₀ satisfies The largest positive integer, TPMI is

The indication field jointly indicates the RI, the first TPMI (i_1) and the second TPMI (i_2). The optional values _of RI include X {r ₁ , r ₂ ,..., _r Optional values for i_2 include Then the indication field indicates i (i ranges from 0 to ) maps to where n ₀ satisfies (where Y ₀ =0, Z ₀ =0), or n ₀ satisfies The largest positive integer, i_1 is i_2 is in Or change the mapping order of i_1 and i_2, i_2 is i_1 is

In the above example, if the selectable value number of RI is {r ₀ , r ₁ ,..., r _Z-1 }, then the value of j in the above summation formula starts from -1, and Y _-1 = 0 is defined, Z _-1 =0.

The above example can be further expanded to include more information, such as rank, the first component (i_1,1), the second component (i_1,2), the phase (i_2) of the precoding matrix, or the number of optional values of i_2 Depending on the value of i_1 (or i_1,1, i_1,2), it can also be used to indicate the domain in other specific application situations.

Specific application situation 2: The terminal supports the DFT-based Type I codebook, and the base station configures the DFT-based Type I codebook for the terminal. The control signaling DCI contains two precoding indication fields, one of which is used for indication. The transmission rank and another indication field are used to indicate the precoding matrix corresponding to the indicated transmission rank. The mapping relationship between the indication field and the specific precoding matrix is as follows:

Indication field used to indicate the transmission rank: For example, when the maximum rank is supported is 1, this field is 0 bits, when the maximum rank is supported is 2, the field is 1 bit, when the maximum rank is supported is 4, the field is 2 bits, this field is 3 bits when the maximum supported rank is 8; or the length of the indication field is determined by the 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) is {4, 5, 6, 7}, that is to say, only transmission rank {1, 2, 3, 8} is supported, then the length of the indication field is 2 bits.

Indication field used to indicate the precoding matrix:

Mapping method 1: The precoding matrices corresponding to different transmission ranks are numbered respectively. In the following example, for example, if rank=1, i _{1, 1} , then i _{1, 2} , then i ₂ , then i ₃ are arranged. Of course, the sorting order mentioned above is just an example, and you can also sort in another order.

When the indication field indicating the transmission rank indicates the 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 layer 1 CSI report using antenna ports 3000 to 2999 + Channel State Information-Reference Signal (CSI-RS) port number

When the indication field indicating the transmission rank indicates the transmission rank 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 respectively 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 layer 2 CSI report using antenna ports 3000 to 2999 + CSI-RS port number

Table 3 Precoding matrix for layer 3 CSI report using antenna ports 3000 to 2999 + CSI-RS port number

Table 4 Precoding matrix for layer 4 CSI report using antenna ports 3000 to 2999 + CSI-RS port number

Table 5 Mapping of i _1,3 to k ₁ and k ₂ for layer 3 CSI report

Table 6 Mapping of i _1,3 to k ₁ and k ₂ reported by layer 3 CSI when the number of CSI-RS ports is less than 16

When the indication field indicating the transmission rank indicates the transmission 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 respectively is:

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

When N ₁ =2, N ₂ =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 layer 5 CSI report using antenna ports 3000 to 2999 + CSI-RS port number

Table 8 Precoding matrix for 6-layer CSI report using antenna ports 3000 to 2999 + CSI-RS port number

When the indication field indicating 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 ₁ =4, N ₂ =1, TPMI index

Table 9 Precoding matrix for layer 7 CSI report using antenna ports 3000 to 2999 + CSI-RS port number

Table 10 Precoding matrix for 8-layer CSI report using antenna ports 3000 to 2999 + CSI-RS port number

Mapping method 2: TPMI indexes corresponding to all ranks are numbered uniformly

TPMI index i＝i _1,1 *i Number of _1,2 *i Number of ₂ *Number of i ₃ +i _1,2 *Number of i ₂ *i Number of ₃ +i ₂ *Number of i ₃ +i ₃ ;

Among them, i ₃ represents the offset of the DFT vector corresponding to different data streams.

Specific application situation 3: The terminal supports the DFT-based Type I codebook, and the base station configures the DFT-based Type I codebook for the terminal. The control signaling DCI contains two precoding indication fields, one of which is used for The precoding matrix indication carries TPMI (i.e. DFT vector index) and another indication field for phase indication. The mapping relationship between this indication field and the specific precoding matrix is as follows:

Indication field used to indicate the precoding matrix: This indication field jointly performs transmission rank and precoding matrix indication. This situation is the same as the specific application situation 1, and will not be described again here.

Indication field used for phase indication: used for indication of coherent combined phase information, for example: 2 bits correspond to Quadrature Phase Shift Keying (QPSK), 3 bits correspond to octal phase shift keying (8 Phase Shift Keying, 8PSK).

Specific application situation 4: The terminal supports the DFT-based Type I codebook, and the base station configures the DFT-based Type I codebook for the terminal. The control signaling DCI contains three precoding indication fields, one of which is used for indication. The transmission rank, an indication field used to indicate the precoding matrix corresponding to the indicated transmission rank, and an indication field used for phase indication. The mapping relationship between the indication field and the specific precoding matrix is as follows:

Indication field used to indicate transmission rank: For example: this field is 0 bits when the maximum rank is supported is 1, 1 bit is supported when the maximum rank is 2, and this field is 1 bit when the maximum rank is supported is 4. 2 bits, this field is 3 bits when the maximum rank is 8. Or the length of the indication field is determined by the 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 It is said that only transmission ranks {1, 2, 3, 8} are supported, then the length of the indication field is 2 bits.

Indication field used to indicate the precoding matrix:

Mapping method 1: The precoding matrices corresponding to different transmission ranks are numbered respectively. In the following example, for example, if rank=1, i _{1, 1} are sorted first, then i _{1, 2,} and then i ₃ . Of course, the sorting order mentioned above is just an example, and you can also sort in another order.

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 the transmission rank rank=5, 6, 7 or 8, the TPMI index indicated by the indication field indicating the precoding matrix is the precoding matrix mapping in Table 7, Table 8, Table 9 or Table 10 respectively. The relationship is:

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

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

TPMI index i=number of i1,1*i1,2*number of i3+i1,2*number of i3+i3.

Indication field used for phase indication: indication used for coherent combined phase information, for example: 2 bits correspond to QPSK, 3 bits correspond to 8PSK.

Specific application situation 5: The terminal supports a third codebook composed of two different codebooks, and the base station configures this codebook for the terminal for uplink transmission. The control signaling DCI contains two precoding indication fields, one of which The indication field indicates the precoding matrix corresponding to the first codebook and the corresponding rank is R1. The other indication field indicates the precoding matrix corresponding to the second codebook and the corresponding rank is R2. Some mathematical operation is used to obtain the third The final precoding matrix corresponding to each 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.

The precoding indication field used to indicate the precoding matrix under a codebook: the precoding index TPMI1 corresponding to codebook one. For example: codebook one is a 2-antenna codebook in the NR Rel-15 protocol, and the maximum supported rank is 2.

Precoding indication field used to indicate the precoding matrix under another codebook: the precoding index TPMI2 corresponding to codebook two. For example: codebook one is a 4-antenna codebook in the NR Rel-15 protocol, supporting a maximum rank of 4 .

The third codebook is an 8-antenna codebook. The final 8-antenna precoding information is obtained through mathematical operations from the 2-antenna codebook and the 4-antenna codebook; the maximum transmission rank is 2×4=8. For example: the base station indicates a 2-antenna precoding matrix (TPMI1) with rank 1 in the first precoding indication field, and a 4-antenna precoding matrix (TPMI2) with rank 3 in the second indication field. Then the total transmission The final precoding matrix is a 2-antenna codebook with rank 1 and a 4-antenna codebook with rank 3, which are obtained through a direct product (kronecker) operation. Certain transmission ranks cannot be supported under this precoding indication method, such as rank values = 5 and 7.

Specific application situation 6: The terminal supports a third codebook composed of two different codebooks, and the base station configures this codebook for the terminal for uplink transmission. The control signaling DCI contains three precoding indication fields, one of which The indication field is used to indicate the transmission rank. One indication field indicates the precoding matrix corresponding to the first codebook, and the other indication field indicates the precoding matrix corresponding to the second codebook. A certain mathematical operation is used to obtain the third codebook. The corresponding final precoding matrix. The corresponding transmission rank when the rank value indicated by the indication field used to indicate the transmission rank is less than or equal to is the rank value corresponding to the first codebook multiplied by the rank value corresponding to the second codebook, R<=R1×R2 .

Indication field used to indicate transmission rank: indicates the total transmission rank. The size of the indication field is, for example: 0 bits when the maximum rank is supported is 1, 1 bit when the maximum rank is 2, 2 bits when the maximum rank is 4, and the maximum rank is 4. In the case of rank 8, this field is 3 bits. Or the length of the indication field is determined by the 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 It is said that only transmission ranks {1, 2, 3, 8} are supported, then the length of the indication field is 2 bits.

The precoding indication field used to indicate the precoding matrix under another codebook: the precoding index TPMI2 corresponding to codebook two. For example: codebook one is a 4-antenna codebook in the NR Rel-15 protocol, supporting a maximum rank of 4 .

The third codebook is an 8-antenna codebook. The final 8-antenna precoding information is obtained through mathematical operations from the 2-antenna codebook and the 4-antenna codebook; the maximum transmission rank is 2×4=8. For example: the base station indicates the rank value = 5 in the indication field used to indicate the transmission rank, and the precoding indication field used to indicate the precoding matrix under one codebook indicates the 2-antenna precoding matrix with rank 2 (TPMI1 ), the precoding indication field used to indicate the precoding matrix under another codebook indicates a 4-antenna precoding matrix with rank 3 (TPMI2), and the final precoding matrix is a 2-antenna codebook with rank 2 and rank The 4-antenna codebook with rank 3 is obtained through direct product operation, and the total precoding matrix corresponds to the codebook with rank 6. In formula 1 below, (X) is a direct product. The first matrix on the left side of the equation is a kroneker matrix with 4 rows and 3 columns and a matrix with 2 rows and 2 columns; the right side of the equation is a matrix with 8 rows and 6 columns. Because the rank indicated this time is 5, the first 5 columns or the last 5 columns of precoding vectors of the precoding matrix are finally taken.

Formula 1:

Specific application situation 7: The terminal supports the DFT-based Type I codebook, and the base station configures the DFT-based Type I codebook for the terminal. The control signaling DCI contains two precoding indication fields, one of which is used for indication. The precoding matrix and another indication field jointly indicate the transmission rank and the corresponding phase. The mapping relationship between the indication field and the specific precoding matrix is as follows:

Indication field that jointly indicates the transmission rank and corresponding phase: jointly indicates the transmission rank (RI) and coherent combined phase information, for example: the supported transmission ranks are {1, 2, 3, 4}; the supported coherent combined phase corresponds QPSK Then the length of the indication field is 4 bits, with a total of 16 states. Each state indicates a transmission rank and coherent combination phase combination.

Indication field used to indicate the precoding matrix:

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

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

TPMI index i=number of i1,1*i1,2*number of i3+i1,2*number of i3+i3.

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

1. Support flexible configuration of the codebook of the uplink transmission precoding matrix and determine the mapping relationship between the TPMI index and the specific precoding matrix;

2. Control the overhead of the TPMI domain in DCI through MAC CE signaling;

3. Obtain all transmission ranks supported by the third precoding matrix based on the direct product operation of the first precoding matrix and the second precoding matrix.

As shown in Figure 3, this embodiment of the present application provides a precoding matrix indication method, which includes:

Step 301: The network side device determines the indication method of the transmission precoding index TPMI in the downlink control information DCI;

Step 302: The network side device sends DCI to the terminal according to the instruction method, and the DCI carries TPMI instruction information.

Optionally, the network side device determines the indication method of the transmission precoding index TPMI in the downlink control information DCI, including:

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

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

The network side device configures first information through high-level signaling. The first information is used to indicate a first precoding matrix set that the terminal can use. The first information includes at least one of the following: codebook type, and the Describes codebook-related information, transmission rank restrictions, and codebook subset constraints CBSR.

Optionally, after the network side device configures the first information through high-level signaling, it also includes:

The network side device sends second information to the terminal through the media access control layer control unit MAC CE. The second information is used to indicate a second precoding matrix set, and the second precoding matrix set is the first A subset of the precoding matrix set.

Optionally, the second information includes at least one of the following: a start index and a stop index of the precoding matrix; at least one set of precoding matrix indications; and a bit map.

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

jointly perform transmission rank and the first precoding indication field indicated by the precoding matrix;

A second precoding indication field for transmission rank indication;

A third precoding indication field for precoding matrix indication;

A fourth precoding indication field for indicating phase information;

Perform at least two fifth precoding indication fields for indicating precoding matrices corresponding to different codebooks respectively;

A sixth precoding indication field that jointly indicates transmission rank and phase information;

A seventh precoding indication field indicating a first part of information and an eighth precoding indication field of a second part of information of a codebook, where the first part of information and the second part of information are used to determine a precoding matrix in the codebook.

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

Optionally, in the case where 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:

Sort the precoding matrices corresponding to the same codebook under the same transmission rank, and put the same The precoding matrix under transmission rank corresponds to TPMI; or

The precoding matrices corresponding to the same codebook under all transmission ranks are uniformly sorted, and the precoding matrices are corresponding to the TPMI in the sorting order.

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

Optionally, the method also includes:

The network side device receives the capability information sent by the terminal;

The capability information includes information on at least one codebook for uplink transmission supported by the terminal.

It should be noted that all descriptions about the network side equipment in the above embodiments are applicable to the embodiments of the precoding matrix indication method applied to the network side equipment. In the embodiment of the present application, by first determining the TPMI in the DCI Instruction mode, and then based on the instruction mode, the TPMI indication information is sent through DCI, so that the terminal determines the precoding matrix used for uplink data transmission according to the TPMI indication information, so that the TPMI indication can be accurately performed, Ensure the accurate determination of the precoding matrix used in uplink data transmission, thereby ensuring the accurate transmission of uplink data.

For the precoding matrix determination method provided by the embodiments of the present application, the execution subject may be a precoding matrix determination device. In the embodiment of the present application, the precoding matrix determination method performed by the precoding matrix determination apparatus is used as an example to illustrate the precoding matrix determination apparatus provided by the embodiment of the present application.

As shown in Figure 4, the precoding matrix determination device 400 in this embodiment of the present application is applied to a terminal and includes:

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

The first determination module 402 is configured to determine the precoding matrix used for uplink data transmission according to the indication information of the TPMI.

A second precoding indication field for transmission rank indication;

A third precoding indication field for precoding matrix indication;

A fourth precoding indication field for indicating phase information;

Optionally, the at least one precoding indication field includes a joint transmission rank and a third precoding matrix indication. In the case where a precoding indication field or the at least one precoding indication field includes a seventh precoding indication field indicating the first part of information of a codebook and an eighth precoding indication field indicating the second part of information, the first A determination module 402, used for:

Wherein, the first mapping relationship includes:

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

Wherein, the second mapping relationship includes:

Sort the precoding matrices corresponding to the same codebook under the same transmission rank, and map the precoding matrices under the same transmission rank to TPMI in the sorting order; or

Optionally, in the case where the at least one precoding indication field includes at least two fifth precoding indication fields that respectively indicate precoding matrices corresponding to different codebooks, the first determination module 402 includes:

By performing a direct product operation on at least two precoding matrices indicated by the fifth precoding indication field, the precoding matrix used for uplink data transmission is determined.

Further, in the case where the at least one precoding indication field also includes a second precoding indication field for indicating transmission rank, the precoding matrix indicated by the at least two fifth precoding indication fields is directly product operation to determine the implementation method of the precoding matrix used for uplink data transmission, including:

Further, in the direct product operation result, the precoding vector with the same number of columns as the transmission rank indicated by the second precoding indication field is used as the precoding matrix used for uplink data transmission, include:

Optionally, the device also includes:

The second sending module is used to send capability information to the network side device;

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

The second receiving module is configured to receive the first information sent by the network side device through high-level signaling. The first information is used to indicate the first set of precoding matrices that the terminal can use. The first information includes at least the following: One item: codebook type, information related to the codebook, transmission rank restriction, codebook subset constraint CBSR.

Optionally, after the second receiving module receives the first information sent by the network side device through high-level signaling, it also includes:

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

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

The start index and end index of the precoding matrix;

at least one set of precoding matrix indications;

Bitmap.

It should be noted that this device embodiment corresponds to the above-mentioned method, and all implementation methods in the above-mentioned method embodiment are applicable to this device embodiment, and the same technical effect can be achieved.

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

The precoding matrix determination device provided by the embodiment of the present application can implement each process implemented by the method embodiment in Figure 2 and achieve the same technical effect. To avoid duplication, the details will not be described here.

Embodiments of the present application also provide a terminal, including a processor and a communication interface. The communication interface is used to receive downlink control information DCI sent by a network side device. The DCI carries indication information of the transmission precoding index TPMI; the processor uses Determine the precoding matrix used for uplink data transmission according to the indication information of the TPMI.

A second precoding indication field for transmission rank indication;

A third precoding indication field for precoding matrix indication;

A fourth precoding indication field for indicating phase information;

The seventh precoding indication field indicating the first part of information of a codebook and the eighth precoding indication of the second part of information In the display area, the first part of information and the second part of information are used to determine the precoding matrix in the codebook.

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

Wherein, the first mapping relationship includes:

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

Wherein, the second mapping relationship includes:

Optionally, in the case where the at least one precoding indication field includes at least two fifth precoding indication fields that respectively indicate precoding matrices corresponding to different codebooks, the processor is configured to:

Optionally, in the case where the at least one precoding indication field also includes a second precoding indication field for indicating transmission rank, the processor is configured to:

Optionally, the processor is used for:

Optionally, the communication interface is used for:

Send capability information to network side devices;

Optionally, the communication interface is also used for:

Receive first information sent by the network side device through high-level signaling, the first information is used to indicate a first set of precoding matrices 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 constraints, codebook subset constraints CBSR.

Optionally, the communication interface is also used for:

Receive the second information sent by the network side device through the media access control layer control unit MAC CE, the second information is used to indicate a second precoding matrix set, and the second precoding matrix set is the first A subset of the precoding matrix set.

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

The start index and end index of the precoding matrix;

at least one set of precoding matrix indications;

Bitmap.

This terminal embodiment corresponds to the above-mentioned terminal-side method embodiment. Each implementation process and implementation manner of the above-mentioned method embodiment can be applied to this terminal embodiment, and can achieve the same technical effect. Specifically, FIG. 5 is a schematic diagram of the hardware structure of a terminal that implements an embodiment of the present application.

The terminal 500 includes but is not limited to: a radio frequency unit 501, a network module 502, an audio output unit 503, an input unit 504, a sensor 505, a display unit 506, a user input unit 507, an interface unit 508, a memory 509, a processor 510, etc. At least some parts.

Those skilled in the art can understand that the terminal 500 may also include a power supply (such as a battery) that supplies power to various components. The power supply may be logically connected to the processor 510 through a power management system, thereby managing charging, discharging, and power consumption through the power management system. Management and other functions. The terminal structure shown in FIG. 5 does not constitute a limitation on the terminal. The terminal may include more or fewer components than shown in the figure, or some components may be combined or arranged differently, which will not be described again here.

It should be understood that in the embodiment of the present application, the input unit 504 may include a graphics processing unit (Graphics Processing Unit, GPU) 5041 and a microphone 5042. The graphics processor 5041 is responsible for the image capture device (GPU) in the video capture mode or the image capture mode. Process the image data of still pictures or videos obtained by cameras (such as cameras). The display unit 506 may include a display panel 5061, which 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 a touch panel 5071 and at least one of other input devices 5072 . Touch panel 5071, also called touch screen. The 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, physical keyboards, function keys (such as volume control keys, switch keys, etc.), trackballs, mice, and joysticks, which will not be described again here.

In this embodiment of the present application, after receiving downlink data from the network side device, the radio frequency unit 501 can transmit it to the processor 510 for processing; in addition, the radio frequency unit 501 can send uplink data to the network side device. Generally, the radio frequency unit 501 includes, but is not limited to, an antenna, amplifier, transceiver, coupler, low noise amplifier, duplexer, etc.

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 for storing programs or instructions and a second storage area for storing data, wherein the first storage area may store an operating system, an application program or instructions required for at least one function (such as a sound playback function, Image playback function, etc.) etc. In addition, save Memory 509 may include volatile memory or nonvolatile memory, or memory 509 may include both volatile and nonvolatile memory. Among them, the non-volatile memory can be read-only memory (Read-Only Memory, ROM), programmable read-only memory (Programmable ROM, PROM), erasable programmable read-only memory (Erasable PROM, EPROM), electrically removable memory. Erase programmable read-only memory (Electrically EPROM, EEPROM) or flash memory. Volatile memory can be random access memory (Random Access Memory, RAM), static random access memory (Static RAM, SRAM), dynamic random access memory (Dynamic RAM, DRAM), synchronous dynamic random access memory (Synchronous DRAM, SDRAM), double data rate synchronous dynamic random access memory (Double Data Rate SDRAM, DDRSDRAM), enhanced synchronous dynamic random access memory (Enhanced SDRAM, ESDRAM), synchronous link dynamic random access memory (Synch link DRAM) , SLDRAM) and direct memory bus random access memory (Direct Rambus RAM, DRRAM). Memory 509 in embodiments of the present application includes, but is not limited to, these and any other suitable types of memory.

The processor 510 may include one or more processing units; optionally, the processor 510 integrates an application processor and a modem processor, where the application processor mainly handles operations related to the operating system, user interface, application programs, etc., Modem processors mainly process wireless communication signals, such as baseband processors. It can be understood that the above modem processor may not be integrated into the processor 510.

Among them, the radio frequency unit 501 is used for:

Receive downlink control information DCI sent by the network side device, where the DCI carries indication information of the transmission precoding index TPMI;

The processor 510 is configured to determine a precoding matrix used for uplink data transmission according to the indication information of the TPMI.

A second precoding indication field for transmission rank indication;

A third precoding indication field for precoding matrix indication;

A fourth precoding indication field for indicating phase information;

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

Wherein, the first mapping relationship includes:

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

Wherein, the second mapping relationship includes:

Optionally, in the case where the at least one precoding indication field includes at least two fifth precoding indication fields that respectively indicate precoding matrices corresponding to different codebooks, the processor 510 is configured to:

Optionally, the processor is used for:

Optionally, the radio frequency unit 501 is also used to:

Send capability information to network side devices;

Optionally, the radio frequency unit 501 is also used to:

Receive second information sent by the network side device through the 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 the first precoding matrix A subset of a collection.

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

The start index and end index of the precoding matrix;

at least one set of precoding matrix indications;

Bitmap.

Preferably, the embodiment of the present application also provides a terminal, including a processor, a memory, and a program or instruction stored in the memory and executable on the processor. When the program or instruction is executed by the processor, the above-mentioned predetermined state is realized. Each process of the embodiment of the coding matrix determination method can achieve the same technical effect. To avoid duplication, it will not be described again here.

Embodiments of the present application also provide a readable storage medium. Programs or instructions are stored on the computer-readable storage medium. When the program or instructions are executed by a processor, each process of the above-mentioned precoding matrix determination method embodiment is implemented, and can To achieve the same technical effect, to avoid repetition, we will not repeat them here.

Among them, the computer-readable storage medium is such as read-only memory (Read-Only Memory, ROM), random access memory (Random Access Memory, RAM), magnetic disk or optical disk, etc.

As shown in Figure 6, this embodiment of the present application also provides a precoding matrix indication device 600, which is applied to network side equipment, including:

The second determination module 601 is used to determine the indication mode of the transmission precoding index TPMI in the downlink control information DCI;

The first sending module 602 is configured to send DCI to the terminal according to the indication method, where the DCI carries TPMI indication information.

Optionally, the second determination module 601 is used to:

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

Optionally, before the first sending module 602 sends DCI to the terminal according to the instruction method, the device further includes:

A configuration module configured to configure first information through high-level signaling. The first information is used to indicate a first set of precoding matrices that the terminal can use. The first information includes at least one of the following: codebook type, and the Describes codebook-related information, transmission rank restrictions, and codebook subset constraints CBSR.

Optionally, after the configuration module configures the first information through high-level signaling, it also includes:

The third sending module is configured to send second information to the terminal through the 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 the A subset of the first set of precoding matrices.

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

The start index and end index of the precoding matrix;

at least one set of precoding matrix indications;

Bitmap.

A second precoding indication field for transmission rank indication;

A third precoding indication field for precoding matrix indication;

A fourth precoding indication field for indicating phase information;

Optionally, the device also includes:

The fourth receiving module is used to receive the capability information sent by the terminal;

It should be noted that this device embodiment is a device corresponding to the above-mentioned method. All implementation methods in the above-mentioned method embodiment are applicable to this device embodiment and can achieve the same technical effect, which will not be described again here.

An embodiment of the present application also provides a network side device, including a processor and a communication interface, wherein the processor is used to determine the indication mode of the transmission precoding index TPMI in the downlink control information DCI;

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

Optionally, the processor is used for:

Optionally, the communication interface is also used for:

First information is configured through high-level signaling, and the first information is used to indicate the first set of precoding matrices that the terminal can use. The first information includes at least one of the following: codebook type, codebook-related Information, transmission rank constraint, codebook subset constraint CBSR.

Optionally, the communication interface is also used for:

The second information is sent to the terminal through the media access control layer control unit MAC CE. The second information is used to indicate a second precoding matrix set. The second precoding matrix set is the first precoding matrix set. Subset.

A second precoding indication field for transmission rank indication;

A third precoding indication field for precoding matrix indication;

A fourth precoding indication field for indicating phase information;

Optionally, the at least one precoding indication field includes precoding matrix indications corresponding to different codebooks. In the case of at least two fifth precoding indication fields and a second precoding indication field that indicates transmission rank, the transmission rank indicated by the second precoding indication field is less than or equal to at least two fifth precoding indications. The number of transmission layers that can be supported by the direct product operation result of the precoding matrix indicated by the field.

Optionally, the communication interface is used for:

Receive capability information sent by the terminal;

Preferably, the embodiment of the present application also provides a network-side device, including a processor, a memory, and a program or instruction stored in the memory and executable on the processor. When the program or instruction is executed by the processor, the above is implemented. The precoding matrix indicates each process of the method embodiment, and can achieve the same technical effect. To avoid repetition, it will not be described again here.

Specifically, the embodiment of the present application also provides a network side device. 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 the radio frequency device 702 . In the uplink direction, the radio frequency device 702 receives information through the antenna 701 and sends the received information to the baseband device 703 for processing. In the downlink direction, the baseband device 703 processes the information to be sent and sends it to the radio frequency device 702. The radio frequency device 702 processes the received information and then sends it out through the antenna 701.

The method performed by the network side device in the above embodiment can be implemented in the baseband device 703, which includes a baseband processor.

The baseband device 703 may include, for example, at least one baseband board on which multiple chips are disposed, as shown in FIG. Program to perform the network-side device operations shown in the above method embodiments.

The network side device may also include a network interface 706, which is, for example, a common public radio interface (CPRI).

Specifically, the network side device 700 in this embodiment of the present invention also includes: instructions or programs stored in the memory 705 and executable on the processor 704. The processor 704 calls the instructions or programs in the memory 705 to execute each of the steps shown in Figure 6. The method of module execution and achieving the same technical effect will not be described in detail here to avoid duplication.

Embodiments of the present application also provide a readable storage medium. Programs or instructions are stored on the readable storage medium. When the program or instructions are executed by a processor, each process of the above-mentioned precoding matrix indication method embodiment is implemented, and can To achieve the same technical effect, to avoid repetition, we will not repeat them here.

Wherein, the processor is the processor in the network side device described in the above embodiment. The readable storage medium includes computer readable storage media, such as computer read-only memory ROM, random access memory RAM, magnetic disk or optical disk, etc.

Optionally, as shown in Figure 8, this embodiment of the present application also provides a communication device 800, which includes a processor 801 and a memory 802. The memory 802 stores programs or instructions that can be run on the processor 801, for example. , when the communication device 800 is a terminal, when the program or instruction is executed by the processor 801, each step of the above-mentioned precoding matrix determination method embodiment is implemented, and the same technical effect can be achieved. When the communication device 800 is a network-side device, the program may refer to When executed by the processor 801, each step of the above-mentioned precoding matrix indication method embodiment is implemented and the same technical effect can be achieved. To avoid duplication, the details are not repeated here.

An embodiment of the present application further provides a chip. The chip includes a processor and a communication interface. The communication interface is coupled to the processor. The processor is used to run programs or instructions to implement the above precoding matrix determination method or The precoding matrix indicates each process of the method embodiment, and can achieve the same technical effect. To avoid repetition, it will not be described again here.

It should be understood that the chips mentioned in the embodiments of this application may also be called system-on-chip, system-on-a-chip, system-on-chip or system-on-chip, etc.

Embodiments of the present application further provide a computer program/program product. The computer program/program product is stored in a storage medium. The computer program/program product is executed by at least one processor to implement the above precoding matrix determination method. Or the various processes of the precoding matrix indication method embodiment, and can achieve the same technical effect, so to avoid repetition, they will not be described again here.

Embodiments of the present application also provide a communication system, including: a terminal and a network side device. The terminal can be used to perform the steps of the precoding matrix determination method as described above. The network side device can be used to perform the above steps. The precoding matrix indicates the steps of the method.

It should be noted that, in this document, the terms "comprising", "comprises" or any other variation thereof are intended to cover a non-exclusive inclusion, such that a process, method, article or device that includes a series of elements not only includes those elements, It also includes other elements not expressly listed or inherent in the process, method, article or apparatus. Without further limitation, an element defined by the statement "comprises a..." does not exclude the presence of additional identical elements in a process, method, article, or device that includes that element. In addition, it should be pointed out that the scope of the methods and devices in the embodiments of the present application is not limited to performing functions in the order shown or discussed, but may also include performing functions in a substantially simultaneous manner or in reverse order according to the functions involved. Functions may be performed, for example, the methods described may be performed in an order different from that described, and various steps may be added, omitted, or combined. Additionally, 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 can clearly understand that the methods of the above embodiments can be implemented by means of software plus the necessary general hardware platform. Of course, it can also be implemented by hardware, but in many cases the former is better. implementation. Based on this understanding, the technical solution of the present application can be embodied in the form of a computer software product that is essentially or contributes to the existing technology. The computer software product is stored in a storage medium (such as ROM/RAM, disk , CD), including several instructions to cause a terminal (which can be a mobile phone, computer, server, air conditioner, or network device, etc.) to execute the methods described in various embodiments of this application.

The embodiments of the present application have been described above in conjunction with the accompanying drawings. However, the present application is not limited to the above-mentioned specific implementations. The above-mentioned specific implementations are only illustrative and not restrictive. Those of ordinary skill in the art will Inspired by this application, many forms can be made without departing from the purpose of this application and the scope protected by the claims, all of which fall within the protection of this application.

Claims

A precoding matrix indication method, including:

The network side device determines the indication method of the transmission precoding index TPMI in the downlink control information DCI;

The network side device sends DCI to the terminal according to the indication method, and the DCI carries TPMI indication information.
The method according to claim 1, wherein the network side device determines the indication mode of the transmission precoding index TPMI in the downlink control information DCI, including:

The network side device determines the indication method of TPMI in the DCI according to the codebook type corresponding to the codebook configured for the terminal, information related to the codebook, and the value of the supported transmission rank.
The method according to claim 1, wherein before the network side device sends DCI to the terminal according to the instruction method, the method further includes:

The network side device configures first information through high-level signaling. The first information is used to indicate a first precoding matrix set that the terminal can use. The first information includes at least one of the following: codebook type, and the Describes codebook-related information, transmission rank restrictions, and codebook subset constraints CBSR.
The method according to claim 3, wherein after the network side device configures the first information through high-level signaling, it further includes:

The network side device sends second information to the terminal through the media access control layer control unit MAC CE. The second information is used to indicate a second precoding matrix set, and the second precoding matrix set is the first A subset of the precoding matrix set.
The method of claim 4, wherein the second information includes at least one of the following:

The start index and end index of the precoding matrix;

at least one set of precoding matrix indications;

Bitmap.
The method according to claim 1, wherein the TPMI indication information is indicated through at least one precoding indication field.
The method according to claim 6, wherein the at least one precoding indication field includes at least one of the following:

jointly perform transmission rank and the first precoding indication field indicated by the precoding matrix;

A second precoding indication field for transmission rank indication;

A third precoding indication field for precoding matrix indication;

A fourth precoding indication field for indicating phase information;

Perform at least two fifth precoding indication fields for indicating precoding matrices corresponding to different codebooks respectively;

A sixth precoding indication field that jointly indicates transmission rank and phase information;

The seventh precoding indication field indicating the first part of information of a codebook and the eighth precoding indication of the second part of information In the display area, the first part of information and the second part of information are used to determine the precoding matrix in the codebook.
The method according to claim 7, wherein the at least one precoding indication field includes a first precoding indication field that jointly indicates a transmission rank and a precoding matrix, or the at least one precoding indication field includes an indication of a In the case of the seventh precoding indication field of the first part of the codebook and the eighth precoding indication field of the second part of the information, the first mapping relationship between the TPMI and the precoding matrix includes:

According to the sorting of transmission ranks, the precoding matrices corresponding to the same codebook under the same transmission rank are sorted respectively, and the precoding matrices are corresponding to the TPMI according to the sorting order.
The method according to claim 7, wherein in the case where 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 :

Sort the precoding matrices corresponding to the same codebook under the same transmission rank, and map the precoding matrices under the same transmission rank to TPMI in the sorting order; or

The precoding matrices corresponding to the same codebook under all transmission ranks are uniformly sorted, and the precoding matrices are corresponding to the TPMI in the sorting order.
The method of claim 7, wherein the at least one precoding indication field includes at least two fifth precoding indication fields for indicating precoding matrices corresponding to different codebooks and a second field for indicating transmission rank. In the case of a precoding indication field, the transmission rank indicated by the second precoding indication field is less than or equal to at least two direct product operations of the precoding matrices indicated by the fifth precoding indication field. The direct product operation result can support The number of transmission layers.
The method of claim 1, further comprising:

The network side device receives the capability information sent by the terminal;

The capability information includes information on at least one codebook for uplink transmission supported by the terminal.
A method for determining a precoding matrix, including:

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

The terminal determines the precoding matrix used for uplink data transmission according to the indication information of the TPMI.
The method according to claim 12, wherein the TPMI indication information is indicated through at least one precoding indication field.
The method of claim 13, wherein the at least one precoding indication field includes at least one of the following:

jointly perform transmission rank and the first precoding indication field indicated by the precoding matrix;

A second precoding indication field for transmission rank indication;

A third precoding indication field for precoding matrix indication;

A fourth precoding indication field for indicating phase information;

Perform at least two fifth precoding indication fields for indicating precoding matrices corresponding to different codebooks respectively;

A sixth precoding indication field that jointly indicates transmission rank and phase information;

The seventh precoding indication field indicating the first part of information of a codebook and the eighth precoding indication of the second part of information In the display area, the first part of information and the second part of information are used to determine the precoding matrix in the codebook.
The method according to claim 14, wherein the at least one precoding indication field includes a first precoding indication field that jointly indicates a transmission rank and a precoding matrix, or the at least one precoding indication field includes a first precoding indication field indicating a In the case of the seventh precoding indication field of the first part of the information and the eighth precoding indication field of the second part of the codebook, the terminal determines the precoding used for uplink data transmission based on the indication information of the TPMI. Coding matrix, including:

According to the first mapping relationship between the TPMI and the precoding matrix, determine the precoding matrix used in uplink data transmission corresponding to the indication information of the TPMI;

Wherein, the first mapping relationship includes:

According to the sorting of transmission ranks, the precoding matrices corresponding to the same codebook under the same transmission rank are sorted respectively, and the precoding matrices are corresponding to the TPMI according to the sorting order.
The method according to claim 14, wherein, in the case where the at least one precoding indication field includes a third precoding indication field for performing precoding matrix indication, the terminal determines to perform precoding matrix indication according to the indication information of the TPMI. The precoding matrix used in uplink data transmission includes:

According to the second mapping relationship between the TPMI and the precoding matrix, determine the precoding matrix used in uplink data transmission corresponding to the indication information of the TPMI;

Wherein, the second mapping relationship includes:

Sort the precoding matrices corresponding to the same codebook under the same transmission rank, and map the precoding matrices under the same transmission rank to TPMI in the sorting order; or

The precoding matrices corresponding to the same codebook under all transmission ranks are uniformly sorted, and the precoding matrices are corresponding to the TPMI in the sorting order.
The method according to claim 14, wherein, in the case where the at least one precoding indication field includes at least two fifth precoding indication fields that respectively perform precoding matrix indication corresponding to different codebooks, the terminal is configured according to The TPMI indication information determines the precoding matrix used for uplink data transmission, including:

By performing a direct product operation on at least two precoding matrices indicated by the fifth precoding indication field, the precoding matrix used for uplink data transmission is determined.
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 transmitting rank indication, the method is configured by combining at least two fifth precoding indication fields. The indicated precoding matrix performs a direct product operation to determine the precoding matrix used for uplink data transmission, including:

When the transmission rank indicated by the second precoding indication field is less than the number of transmission layers that can be supported by the direct product operation result, the direct product operation result will be the same as the transmission rank indicated by the second precoding indication field. Precoding vectors with the same rank and number of columns are used as the precoding matrix used for uplink data transmission.
The method according to claim 18, wherein in the direct product operation result, a precoding vector with the same number of columns as the transmission rank indicated by the second precoding indication field is used for uplink data transmission. The precoding matrix includes:

Use the precoding vectors of the first or last N columns in the direct product budget result as the precoding matrix used for uplink data transmission;

Wherein, N is equal to the transmission rank indicated by the second precoding indication field.
The method of claim 12, further comprising:

The terminal sends capability information to the network side device;

The capability information includes information on at least one codebook for uplink transmission supported by the terminal.
The method according to claim 12, wherein before the terminal receives the downlink control information DCI sent by the network side device, it further includes:

The terminal receives first information sent by the network side device through high-level signaling. The first information is used to indicate a first precoding matrix set that the terminal can use. The first information includes at least one of the following: code This type, information related to the codebook, transmission rank constraints, codebook subset constraints CBSR.
The method according to claim 21, wherein after the terminal receives the first information sent by the network side device through high-level signaling, it further includes:

The terminal receives the second information sent by the network side device through the media access control layer control unit MAC CE. The second information is used to indicate a second precoding matrix set, and the second precoding matrix set is the a subset of the first precoding matrix set.
The method of claim 22, wherein the second information includes at least one of the following:

The start index and end index of the precoding matrix;

at least one set of precoding matrix indications;

Bitmap.
A precoding matrix determination device, applied to terminals, including:

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

The first determination module is configured to determine the precoding matrix used for uplink data transmission according to the indication information of the TPMI.
A precoding matrix indication device, applied to network side equipment, including:

The second determination module is used to determine the indication mode of the transmission precoding index TPMI in the downlink control information DCI;

The first sending module is configured to send DCI to the terminal according to the indication method, where the DCI carries indication information of TPMI.
A terminal, including a processor and a memory, the memory stores programs or instructions that can be run on the processor, and when the programs or instructions are executed by the processor, the implementation as claimed in any one of claims 12 to 23 is provided. The steps of the precoding matrix determination method described above.
A network side device, including a processor and a memory. The memory stores programs or instructions that can be run on the processor. When the program or instructions are executed by the processor, any one of claims 1 to 11 is implemented. The precoding matrix described in the item indicates the steps of the method.
A readable storage medium storing programs or instructions on the readable storage medium. When the programs or instructions are executed by a processor, the steps of the precoding matrix indication method according to any one of claims 1 to 11 are implemented; or The steps of implementing the precoding matrix determination method according to any one of claims 12 to 23.