CN117955529A

CN117955529A - Precoding matrix, SRI indication method, terminal and network equipment

Info

Publication number: CN117955529A
Application number: CN202211289029.7A
Authority: CN
Inventors: 塔玛拉卡·拉盖施; 孙荣荣
Original assignee: Vivo Mobile Communication Co Ltd
Current assignee: Vivo Mobile Communication Co Ltd
Priority date: 2022-10-20
Filing date: 2022-10-20
Publication date: 2024-04-30

Abstract

The application discloses a precoding matrix, an indication method of SRI, a terminal and network side equipment, belonging to the technical field of communication. The network equipment sends precoding matrix indication information to the terminal; the precoding matrix indication information is used for indicating a precoding matrix through a precoding index when the maximum transmission rank value configured by the network side equipment is smaller than or equal to a preset threshold; and when the maximum transmission rank value is greater than the preset threshold, the precoding matrix indication information is used for indicating the precoding matrix through a bit map.

Description

Precoding matrix, SRI indication method, terminal and network equipment

Technical Field

The application belongs to the technical field of communication, and particularly relates to a precoding matrix, an indication method of SRI (sequence number indicator), a terminal and network side equipment.

Background

Currently, when a terminal transmits uplink data to a network side device, the terminal may perform data transmission based on a codebook (codebook) or a non-codebook (codebook). The codebook-based data transmission refers to that before the terminal transmits uplink data, the network side equipment indicates a precoding matrix to the terminal, and when the terminal transmits the uplink data, the terminal performs data transmission based on the precoding matrix. The data transmission based on the non-codebook refers to that before the terminal transmits uplink data, the network side device does not indicate a precoding matrix to the terminal any more, but indicates Sounding REFERENCE SIGNAL Resource Index (SRI), and when the terminal transmits uplink data, the terminal uses an antenna or an antenna port used when transmitting SRS resources corresponding to the SRI to perform data transmission. The codebook-based data transmission may include, among other things, non-coherent codebook-based data transmission and coherent codebook-based data transmission.

With the increase of the number of the transmitting antennas of the terminal, the terminal can use more transmitting antennas or antenna ports to transmit uplink data to the network side device. However, when the number of the transmitting antennas is large, if the network side device indicates the precoding matrix or the SRI to the terminal according to the existing indication manner, the signaling overhead is increased, the complexity is increased, and an effective technical scheme is still lacking at present to solve the technical problem.

Disclosure of Invention

The embodiment of the application provides a precoding matrix, an SRI (sequence number indicator) indicating method, a terminal and network side equipment, which can solve the problems that signaling overhead is increased and complexity is higher when the network side equipment indicates the precoding matrix or the SRI to the terminal based on the existing indicating mode under the condition of more antennas.

In a first aspect, there is provided a method for indicating a precoding matrix, the method comprising:

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

The precoding matrix indication information is used for indicating a precoding matrix through a precoding index when the maximum transmission rank value configured by the network side equipment is smaller than or equal to a first preset threshold;

and when the maximum transmission rank value is greater than the first preset threshold, the precoding matrix indication information is used for indicating a precoding matrix through a bit bitmap.

In a second aspect, an apparatus for indicating a precoding matrix is provided, where the apparatus includes:

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

In a third aspect, there is provided a method for indicating a precoding matrix, the method comprising:

the terminal receives precoding matrix indication information sent by network side equipment;

When the maximum transmission rank value configured by the network side equipment is smaller than or equal to a first preset threshold, the terminal determines a precoding matrix according to a precoding index;

And under the condition that the maximum transmission rank value is larger than the first preset threshold, the terminal determines a precoding matrix according to the bit bitmap.

In a fourth aspect, an apparatus for indicating a precoding matrix is provided, where the apparatus includes:

The receiving module is used for receiving precoding matrix indication information sent by the network side equipment;

A determining module, configured to determine a precoding matrix according to a precoding index when a maximum transmission rank value configured by the network side device is less than or equal to a first preset threshold; and determining a precoding matrix according to the bit bitmap under the condition that the maximum transmission rank value is larger than the first preset threshold.

In a fifth aspect, there is provided a method for indicating SRI, the method comprising:

the network side equipment sends SRI indication information to the terminal;

Wherein, when the value of the first parameter is smaller than or equal to the second preset threshold, the SRI indication information is used for indicating the SRI through the index, and the first parameter includes at least one of the following: the maximum transmission rank configured by the network side equipment; the number of single-port sounding reference signal SRS resources configured by the network equipment;

And under the condition that the value of the first parameter is larger than the second preset threshold, the SRI indication information is used for indicating SRI through a bit map.

In a sixth aspect, there is provided an indication device for SRI, the device comprising:

The sending module is used for sending SRI indication information by the terminal;

Wherein, when the value of the first parameter is smaller than or equal to the second preset threshold, the SRI indication information is used for indicating the SRI through the index, and the first parameter includes at least one of the following: maximum transmission rank configured by the network side equipment; the number of single-port sounding reference signal SRS resources configured by the network equipment;

In a seventh aspect, there is provided a method for indicating SRI, the method comprising:

the terminal receives SRI indication information sent by network side equipment;

And under the condition that the value of the first parameter is smaller than or equal to a second preset threshold, the terminal determines SRI according to the index, wherein the first parameter comprises at least one of the following: the maximum transmission rank configured by the network side equipment; the number of single-port sounding reference signal SRS resources configured by the network equipment;

And under the condition that the value of the first parameter is larger than the second preset threshold, the terminal determines SRI according to the bit map.

In an eighth aspect, there is provided an indication device of an SRI, the device comprising:

the receiving module is used for receiving SRI indication information sent by the network side equipment;

A determining module, configured to determine, according to the index, the SRI if the value of the first parameter is less than or equal to a second preset threshold, where the first parameter includes at least one of: the maximum transmission rank configured by the network side equipment; the number of single-port sounding reference signal SRS resources configured by the network equipment; and under the condition that the value of the first parameter is larger than the second preset threshold, determining SRI according to the bit map.

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

A tenth aspect provides a terminal, including a processor and a communication interface, where the communication interface is configured to receive precoding matrix indication information sent by a network side device; the processor is configured to determine a precoding matrix according to a precoding index when a maximum transmission rank value configured by the network side device is less than or equal to a first preset threshold; determining a precoding matrix according to a bit bitmap when the maximum transmission rank value is greater than the first preset threshold; or alternatively

The communication interface is used for receiving SRI indication information sent by the network equipment; the processor is configured to determine an SRI according to the index if a value of a first parameter is less than or equal to a second preset threshold, where the first parameter includes at least one of: the maximum transmission rank configured by the network side equipment; the number of single-port sounding reference signal SRS resources configured by the network equipment; and under the condition that the value of the first parameter is larger than the second preset threshold, determining SRI according to the bit map.

In an eleventh aspect, there is provided a network side device comprising a processor and a memory storing a program or instructions executable on the processor, the program or instructions implementing the steps of the method according to the first aspect or the steps of the method according to the fifth aspect when executed by the processor.

A twelfth aspect provides a network side device, including a processor and a communication interface, where the communication interface is configured to send precoding matrix indication information to a terminal; the precoding matrix indication information is used for indicating a precoding matrix through a precoding index when the maximum transmission rank value configured by the network side equipment is smaller than or equal to a first preset threshold; the precoding matrix indication information is used for indicating a precoding matrix through a bit bitmap when the maximum transmission rank value is larger than the first preset threshold; or alternatively

The communication interface is used for sending SRI indication information to the terminal; wherein, when the value of the first parameter is smaller than or equal to the second preset threshold, the SRI indication information is used for indicating the SRI through the index, and the first parameter includes at least one of the following: maximum transmission rank configured by the network side equipment; the number of single-port sounding reference signal SRS resources configured by the network equipment; and under the condition that the value of the first parameter is larger than the second preset threshold, the SRI indication information is used for indicating SRI through a bit map.

In a thirteenth aspect, there is provided an indication system of a precoding matrix, including: a terminal and a network side device, where the terminal may be configured to perform the step of the method for indicating a precoding matrix according to the third aspect, and the network side device may be configured to perform the step of the method for indicating a precoding matrix according to the first aspect.

In a fourteenth aspect, there is provided an indication system of SRI, comprising: a terminal and a network side device, where the terminal is configured to perform the steps of the method for indicating SRI according to the seventh aspect, and the network side device is configured to perform the steps of the method for indicating SRI according to the fifth aspect.

A fifteenth aspect provides a readable storage medium having stored thereon a program or instructions which when executed by a processor, performs the steps of the method as described in the first aspect, or performs the steps of the method as described in the third aspect, or performs the steps of the method as described in the fifth aspect, or performs the steps of the method as described in the seventh aspect.

In a sixteenth aspect, there is provided a chip comprising a processor and a communication interface coupled to the processor for running a program or instructions, implementing a method as described in the first aspect, or implementing a method as described in the third aspect, or implementing a method as described in the fifth aspect, or implementing a method as described in the seventh aspect.

In a seventeenth aspect, there is provided a computer program/program product stored in a storage medium, the computer program/program product being executable by at least one processor to perform the steps of the method of indicating a precoding matrix as described in the first aspect, or to perform the steps of the method of indicating a precoding matrix as described in the third aspect, or to perform the steps of the method of indicating an SRI as described in the fifth aspect, or to perform the steps of the method of indicating an SRI as described in the seventh aspect.

In the embodiment of the application, when the network side equipment indicates the precoding matrix to the terminal, the precoding matrix is not indicated in a single mode of using the precoding index, but the maximum transmission rank value configured by the network side equipment is taken into consideration, when the maximum transmission rank value is smaller than or equal to the first preset threshold, the precoding matrix is indicated in a mode of using the precoding index by the network side equipment, and when the maximum transmission rank value is greater than the first preset threshold, the precoding matrix is indicated in a mode of using the bit bitmap by the network side equipment, so that the precoding matrix can be flexibly indicated in different modes, not only the signaling overhead can be reduced, but also the complexity can be reduced.

In the embodiment of the application, when the network side equipment indicates the SRI to the terminal, the SRI is not indicated in a single index-using mode any more, but the SRI is flexibly indicated in different modes, so that not only the signaling overhead can be reduced, but also the complexity can be reduced by taking the maximum transmission rank value and/or the single port SRS resource number configured by the network side equipment into consideration.

Drawings

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

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

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

fig. 4 is a schematic flow chart of a method of indication of SRIs according to an embodiment of the present application;

Fig. 5 is a schematic flow chart diagram of a method of indication of SRIs in accordance with an embodiment of the present application;

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

fig. 7 is a schematic structural diagram of an indicating device of a precoding matrix according to an embodiment of the present application;

fig. 8 is a schematic structural view of an indication device of an SRI according to an embodiment of the present application;

fig. 9 is a schematic structural view of an indication device of an SRI according to an embodiment of the present application;

Fig. 10 is a schematic structural view of a communication device according to an embodiment of the present application;

Fig. 11 is a schematic structural view of a terminal according to an embodiment of the present application;

Fig. 12 is a schematic structural diagram of a network side device according to an embodiment of the present application.

Detailed Description

At present, when a terminal transmits uplink data to a network side device based on a codebook, specifically, the network side device may configure one or more multiport Sounding reference signal (Sounding REFERENCE SIGNAL, SRS) resources to the terminal, the terminal uses different antenna ports to transmit multiport SRS resources to the network side device, the network side device measures the SRS resources transmitted by the terminal, and selects a suitable precoding matrix according to a measurement result to indicate to the terminal, and when the terminal transmits uplink data, the terminal may use the precoding matrix indicated by the network side device to transmit data.

When the terminal transmits uplink data to the network side equipment based on the non-codebook, specifically, the network side equipment can configure one or more single-port SRS resources to the terminal, the terminal can transmit the single-port SRS resources to the network side equipment by using different antenna ports based on the configuration of the network side equipment, the network side equipment measures the single-port SRS resources transmitted by the terminal and indicates SRI to the terminal according to a measurement result, so that the terminal can use the antenna port used when transmitting the SRS resources corresponding to the SRI before to transmit data when transmitting the data.

In the prior art, a terminal typically uses 2 or 4 transmit antennas when transmitting uplink data based on a codebook or a non-codebook. Taking 4 transmitting antennas as an example, when the terminal uses 4 transmitting antennas to transmit uplink data, the maximum transmission rank value that can be supported is 4 (i.e. the maximum rank=4 supported, that is, the maximum number of supported transmission streams is 4), when the network side device indicates the precoding matrix to the terminal, the network side device may indicate by means of a precoding index (i.e. a transmission precoding matrix indication (TRANSMITTED PRECODING MATRIX INDICATOR, TPMI) index), as shown in tables 1 to 4 below, and when the network side device indicates the SRI to the terminal, the network side device may indicate by means of an index, as shown in tables 1 to 8 below.

TABLE 1

Table 1 shows the correspondence between TPMI index and precoding matrix when the terminal transmits single-stream data (single-layer transmission) using 4 antenna ports. Wherein, the precoding matrix corresponding to the TPMI index 0-3 is a non-coherent codebook (only one antenna port is used for transmitting single stream data), and the precoding matrix corresponding to the rest of the TPMI indexes is a coherent codebook (two or more antenna ports are used for transmitting single stream data).

TABLE 2

Table 2 shows the correspondence between TPMI index and precoding matrix when the terminal transmits two-stream data (two-layer transmission) using 4 antenna ports. The precoding matrix corresponding to TPMI indexes 0-5 is a non-coherent codebook (each stream of data is transmitted by using one antenna port, the antenna ports used by the two streams of data are different), and the precoding matrices corresponding to the other TPMI indexes are coherent codebooks.

TABLE 3 Table 3

Table 3 shows the correspondence between TPMI index and precoding matrix when the terminal transmits three stream data (thread-layer transmission) using 4 antenna ports. The precoding matrix corresponding to the TPMI index 0 is a non-coherent codebook (each stream of data is sent by using one antenna port, the three streams of data are different in antenna ports), and the precoding matrices corresponding to the other TPMI indexes are coherent codebooks.

TABLE 4 Table 4

Table 4 shows the correspondence between TPMI index and precoding matrix when the terminal transmits four-stream data (four-layer transmission) using 4 antenna ports. The precoding matrix corresponding to the TPMI index 0 is a non-coherent codebook (each stream of data is sent by using one antenna port, the four streams of data are different in antenna ports), and the precoding matrices corresponding to the other TPMI indexes are coherent codebooks.

TABLE 5

Table 5 indicates SRI transmitted on a Physical Uplink shared channel (Physical Uplink SHARED CHANNEL, PUSCH) based on a non-codebook, and the maximum transmission rank value configured by the network side is 1, i.e., the maximum transmission rank value when the terminal transmits Uplink data is 1, i.e., the maximum data stream number when the terminal transmits Uplink data is 1. The SRI(s) is one or more SRIs indicated by the network side equipment, the SRIs correspond to SRS resources one by one, and N _SRS is the number of single-port SRS resources configured by the network side equipment. As shown in table 5, when the number of single-port SRS resources configured by the network side device is 2, the network side device may indicate SRI0 through index 0, and the terminal may use an antenna port used when transmitting the SRS resources corresponding to SRI0 to perform data transmission (single-stream data), or the network side device may indicate SRI1 through index 1, and the terminal may use an antenna port used when transmitting the SRS resources corresponding to SRI1 to perform data transmission (single-stream data) when transmitting the uplink data. In the case that the number of single-port SRS resources configured by the network side device is 3 and 4, the network side device may use the same method to indicate different SRIs through different indexes, which is not illustrated here. Wherein, in the case that the maximum transmission rank value configured by the network side device is 1, one index may be used to indicate one SRI.

TABLE 6

Table 6 is an SRI indication of PUSCH transmission based on non-codebook, in case the maximum transmission rank value configured by the network side device is 2. As shown in table 6, when the number of single-port SRS resources configured by the network side device is 2, the network side device may indicate SRI0 through index 0, the terminal may use an antenna port used when transmitting the SRS resources corresponding to SRI0 to perform data transmission (single-stream data), or the network side device may indicate SRI1 through index 1, the terminal may use an antenna port used when transmitting the SRS resources corresponding to SRI1 to perform data transmission (single-stream data), or the network side device may indicate SRI0 and SRI1 through index 2, the terminal may use an antenna port used when transmitting the SRS resources corresponding to SRI0 to transmit first-stream data, and use an antenna port used when transmitting the SRS resources corresponding to SRI1 to transmit second-stream data. In the case that the number of single-port SRS resources configured by the network side device is 3 and 4, the network side device may use the same method to indicate different SRIs through different indexes, which is not illustrated here. In the case where the maximum transmission rank value configured by the network side device is 2, one index may be used to indicate one or more SRIs.

TABLE 7

Table 7 indicates that, in the case where the maximum transmission rank value configured by the network side device is 3, the SRI indication based on PUSCH transmission of the non-codebook is the same as table 6, and is not illustrated here. In the case where the maximum transmission rank value configured by the network side device is 3, one index may be used to indicate one or more SRIs.

TABLE 8

Table 8 indicates that, in the case where the maximum transmission rank value configured by the network side device is 4, the SRI indication based on PUSCH transmission of the non-codebook is the same as table 6, and is not illustrated here. In the case where the maximum transmission rank value configured by the network side device is 4, one index may be used to indicate one or more SRIs.

At present, as the number of transmitting antennas of a terminal increases, the terminal can use more transmitting antennas or antenna ports to transmit uplink data to a network side. For example, the terminal may transmit uplink data using 8 transmit antennas or more. In the case that the number of the transmitting antennas of the terminal is large, the network side device needs to indicate the precoding matrix or the SRI to the terminal in order to facilitate the terminal to transmit the uplink data, however, there is no specific indication mode at present, if the indication is still performed according to the indication modes (i.e. table 1 to table 8) of the 4 transmitting antennas, there will be many combinations for indicating the precoding matrix, so that not only the design complexity is high, but also more combinations need more bits for indicating, resulting in a large signaling overhead, and similarly, the same problem exists for indicating the SRI.

Therefore, when the network side equipment indicates the precoding matrix or the SRI to the terminal based on the existing indication mode under the condition of more antennas, the signaling overhead is increased, the complexity is higher, and an effective technical scheme is still lacking at present to solve the technical problem.

The embodiment of the application provides a precoding matrix, an SRI indicating method, a terminal and network side equipment, wherein when the number of terminal antennas is large, the network side equipment does not singly indicate the precoding matrix by using a precoding index when indicating the precoding matrix to the terminal, but considers the maximum transmission rank value configured by the network side equipment, when the maximum transmission rank value is smaller than or equal to a first preset threshold, the network side equipment indicates the precoding matrix by using the precoding index, and when the maximum transmission rank value is larger than the first preset threshold, the network side equipment indicates the precoding matrix by using a bit bitmap, so that different modes can be used for flexibly indicating the precoding matrix, signaling overhead can be reduced, and complexity can be reduced. Similarly, when the number of terminal antennas is large, the network side device does not indicate the SRI in a single index manner any more when indicating the SRI to the terminal, but considers the maximum transmission rank value and/or the single port SRS resource number configured by the network side device, and indicates the SRI in a manner that the network side device uses the index when the maximum transmission rank value and/or the single port SRS resource number is less than or equal to the second preset threshold, and indicates the SRI in a manner that the network side device uses the bit bitmap when the maximum transmission rank value and/or the single port SRS resource number is greater than the second preset threshold, so that the SRI can be flexibly indicated in different manners, not only reducing signaling overhead, but also reducing complexity.

The technical solutions of the embodiments of the present application will be clearly described below with reference to the drawings in the embodiments of the present application, and it is apparent that the described embodiments are some embodiments of the present application, but not all embodiments. All other embodiments, which are derived by a person skilled in the art based on the embodiments of the application, fall within the scope of protection of the application.

The terms first, second and the like in the description and in the claims, are used for distinguishing between similar elements and not necessarily for describing a particular sequential or chronological order. It is to be understood that the terms so used are interchangeable under appropriate circumstances such that the embodiments of the application are capable of operation in sequences other than those illustrated or otherwise described herein, and that the "first" and "second" distinguishing between objects generally are not limited in number to the extent that the first object may, for example, be one or more. Furthermore, in the description and claims, "and/or" means at least one of the connected objects, and the character "/" generally means a relationship in which the associated object is an "or" before and after.

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

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

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

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

S202: the network equipment sends precoding matrix indication information to the terminal; the precoding matrix indication information is used for indicating a precoding matrix through a precoding index when the maximum transmission rank value configured by the network side equipment is smaller than or equal to a first preset threshold; and when the maximum transmission rank value is greater than the first preset threshold, the precoding matrix indication information is used for indicating a precoding matrix through a bit bitmap.

Before the terminal transmits uplink data to the network side device based on the codebook, the network side device may send precoding matrix indication information to the terminal to indicate a precoding matrix used for transmitting the uplink data to the terminal. The terminal here may be a terminal having N transmit antennas, which supports maximum N stream data simultaneous transmission (i.e., maximum transmission rank value=n), where N may be an integer greater than 4, for example, where N may be 8.

In the embodiment of the application, the precoding matrix indication information can indicate the precoding matrix to the terminal in different modes. Specifically, when the maximum transmission rank value configured by the network side device is smaller than or equal to a first preset threshold, precoding matrix indication information is used for indicating the precoding matrix by means of a precoding index, and when the maximum transmission rank value configured by the network side device is greater than the first preset threshold, precoding matrix indication information is used for indicating the precoding matrix by means of a bit bitmap. The maximum transmission rank value configured by the network side device is smaller than or equal to the capability of supporting the maximum transmission rank value reported by the terminal (the capability of the network side device that the terminal can report the maximum transmission rank value supported by the network side device before indicating the precoding matrix, the network side device can configure the maximum transmission rank value based on the capability), and the capability of supporting the maximum transmission rank value reported by the terminal is smaller than or equal to the number of transmitting antennas or the number of antenna ports of the terminal.

In this way, when the number of terminal antennas is large, the network side device does not only indicate the precoding matrix by using the precoding index when indicating the precoding matrix to the terminal, but also considers the maximum transmission rank value configured by the network side device, and indicates the precoding matrix by using the precoding index when the maximum transmission rank value is smaller than or equal to the first preset threshold, and indicates the precoding matrix by using the bit bitmap when the maximum transmission rank value is greater than the first preset threshold, so that the precoding matrix can be flexibly indicated by using different modes, thereby not only reducing signaling overhead, but also reducing complexity.

Alternatively, as an embodiment, the precoding matrix indication information may correspond to a precoding indication field, where the precoding indication field may include a plurality of bits, that is, the precoding matrix indication information may include a plurality of bits, where the plurality of bits are used to indicate the precoding matrix to the terminal by means of a precoding index or a bit map. Optionally, when the precoding matrix is indicated by means of the precoding index, the number of the plurality of bits may be smaller than the number of the plurality of bits when the precoding matrix is indicated by means of the bit bitmap, that is, when the maximum transmission rank value configured by the network side device is smaller than or equal to the first preset threshold, the network side device may indicate the precoding matrix by means of the smaller number of bits, so that signaling overhead may be reduced, and when the maximum transmission rank value configured by the network side device is greater than the first preset threshold, the network side device may indicate the precoding matrix by means of the larger number of bits, so that complexity is reduced.

Optionally, as an embodiment, in case that the maximum transmission rank value configured by the network side device is less than or equal to the first preset threshold, the precoding matrix indication information may specifically include M bits, where the M bits may correspond to K precoding indexes, and one precoding index may be used to indicate one precoding matrix. Where M is a positive integer, and the specific size of M may relate to the maximum transmission rank value configured by the network side device and/or the number of precoding matrices that need to be indicated (or the design of the precoding matrices). Alternatively, M may be less than the number of transmit antennas or the number of antenna ports of the terminal, for example, the number of transmit antennas of the terminal is 8, and M may be 2, 3, 4, or the like.

Note that K is a positive integer and less than or equal to 2 ^M, that is, each index may be used to indicate the precoding matrix (K is equal to 2 ^M) in 2 ^M precoding indexes corresponding to M bits, or some indexes are used to indicate the precoding matrix, and the rest indexes are not used to indicate the precoding matrix (K is less than 2 ^M). For example, if the number of precoding matrices is 8, the network side device uses 3 bits to indicate a specific precoding matrix to the terminal, and all of the 8 indexes corresponding to the 3 bits may be used to indicate the precoding matrix, and one index is used to indicate one precoding matrix. If the number of precoding matrixes is 6, the network side device uses 3 bits to indicate a specific precoding matrix to the terminal, and then 6 indexes can indicate the precoding matrix in 8 indexes corresponding to the 3 bits, one index is used for indicating one precoding matrix, and the other 2 indexes are not used for indicating the precoding matrix.

Optionally, as an embodiment, in case that the maximum transmission rank value configured by the network side device is greater than the first preset threshold, the precoding matrix indication information may specifically include a bit bitmap (bitmap) of N bits, where the bit bitmap may be used to indicate a transmission rank value and an antenna port used when the terminal performs uplink data transmission, and the transmission rank value and the antenna port may be used to determine the precoding matrix. Wherein N is a positive integer, which may be specifically equal to the number of transmitting antennas or the number of antenna ports of the terminal. For example, if the number of transmit antennas of the terminal is 8, N may be equal to 8.

When the network side equipment indicates the transmission rank value of the terminal for uplink data transmission through the bit bitmap of N bits, the network side equipment can indicate through the value of the N bits. Alternatively, the number of bits of the N bits with a value of 1 may be used to indicate the transmission rank value. For example, if the bit map of N bits is 00110001, the network side device instructs the terminal to have a transmission rank value of 3 when transmitting uplink data. In one possible implementation manner, the network side device may also indicate a transmission rank value by using the number of bits with a value of 0 in the N bits, for example, if the bit bitmap of the N bits is 11001110, the transmission rank value indicated by the network side device to the terminal is 3. The transmission rank value indicated by the network side equipment through the bit bitmap with N bits is smaller than or equal to N, and is smaller than or equal to the maximum transmission rank value configured by the network side equipment.

When the network side equipment indicates the antenna port used by the terminal for uplink data transmission through the bit bitmap of N bits, the network side equipment can also indicate through the value of the N bits. Optionally, the N bits may sequentially correspond to a plurality of antenna ports of the terminal in a specified order, where a bit value of 1 may be used to indicate that the corresponding antenna port is used for data transmission. The specified order may be left-to-right or right-to-left. For example, if the bit map of N bits is 00110001, and the bit maps sequentially correspond to the antenna ports 1 to 8 of the terminal from left to right, the network side device instructs the terminal to transmit uplink data using the antenna ports 3,4 and 8. In a possible implementation manner, the network side device may also indicate which antenna ports are used when the terminal transmits uplink data by using a bit value of 0. For example, if the bit map of N bits is 11001110, which corresponds to the antenna port 1 to the antenna port 8 of the terminal in sequence from left to right, the network side device instructs the terminal to transmit uplink data using the antenna ports 3,4 and 8.

Optionally, as an embodiment, the first preset threshold may be a positive integer greater than or equal to 1 and less than N, where N is the number of transmit antennas or the number of antenna ports of the terminal. The first preset threshold may in particular be configured or indicated by the network side device or predefined by the protocol.

Optionally, the precoding matrix indicated to the terminal by the network side device through the precoding matrix indication information may correspond to the incoherent codebook, that is, when the network side device indicates the precoding matrix of the incoherent codebook to the terminal, the indication may be performed through the technical scheme provided by the embodiment of the present application, so as to reduce signaling overhead and reduce complexity.

As shown in fig. 3, an embodiment of the present application provides a method 300 for indicating a precoding matrix, which may be performed by a terminal, in other words, may be performed by software or hardware installed in the terminal, and the method for indicating a precoding matrix includes the following steps.

S302: and the terminal receives precoding matrix indication information sent by the network side equipment.

Before transmitting uplink data to the network side equipment based on the codebook, the terminal can receive precoding matrix indication information sent by the network side equipment, and transmit the uplink data based on the precoding matrix indicated by the precoding matrix indication information. The terminal here may be a terminal having N transmit antennas, which supports maximum N stream data simultaneous transmission (i.e., maximum transmission rank value=n), where N may be an integer greater than 4, for example, where N may be 8.

In the embodiment of the application, the precoding matrix indication information can indicate the precoding matrix in different modes. Specifically, when the maximum transmission rank value configured by the network side device is smaller than or equal to a first preset threshold, precoding matrix indication information is used for indicating the precoding matrix by means of a precoding index, and when the maximum transmission rank value configured by the network side device is greater than the first preset threshold, precoding matrix indication information is used for indicating the precoding matrix by means of a bit bitmap. The maximum transmission rank value configured by the network side device is smaller than or equal to the capability of supporting the maximum transmission rank value reported by the terminal (the capability of the network side device that the terminal can report the maximum transmission rank value supported by the network side device before indicating the precoding matrix, the network side device can configure the maximum transmission rank value based on the capability), and the capability of supporting the maximum transmission rank value reported by the terminal is smaller than or equal to the number of transmitting antennas or the number of antenna ports of the terminal.

The specific implementation of indicating precoding matrix by precoding index or bit map for indicating precoding matrix can be referred to the corresponding content in the embodiment shown in fig. 2, and will not be described in detail here.

Optionally, as an embodiment, the first preset threshold may be a positive integer greater than or equal to 1 and less than N, where N is the number of transmit antennas or the number of antenna ports of the terminal, and specifically may be configured or indicated by the network side device, or predefined by a protocol.

S304: when the maximum transmission rank value configured by the network side equipment is smaller than or equal to a first preset threshold, the terminal determines a precoding matrix according to a precoding index; and under the condition that the maximum transmission rank value is larger than the first preset threshold, the terminal determines a precoding matrix according to the bit bitmap.

After receiving the precoding matrix indication information sent by the network side equipment, the terminal can determine the precoding matrix indicated by the network side equipment according to the precoding matrix indication information, so that the terminal can perform data transmission based on the precoding matrix when transmitting uplink data to the network side equipment.

In the embodiment of the present application, when determining the precoding matrix according to the precoding matrix indication information, the terminal may include:

Determining whether a maximum transmission rank value configured by the network side equipment is smaller than or equal to a first preset threshold;

Determining a precoding matrix according to the precoding index under the condition that the maximum transmission rank value configured by the network side equipment is smaller than or equal to a first preset threshold;

and determining a precoding matrix according to the bit bitmap under the condition that the maximum transmission rank value configured by the network side equipment is larger than a first preset threshold.

Specifically, the first preset threshold may be configured or indicated by the network side device, or predefined by the protocol, and the maximum transmission rank value is also configured by the network side device, so that when the terminal determines the precoding matrix according to the precoding matrix indication information, it may be determined whether the maximum transmission rank value configured by the network side device is less than or equal to the first preset threshold. If the maximum transmission rank value is less than or equal to the first preset threshold, it may be stated that the network side device indicates by means of a precoding index when indicating the precoding matrix by means of the precoding matrix indication information, and in this case, the terminal may determine the precoding matrix according to the precoding index. If the maximum transmission rank value is greater than the first preset threshold, it may be indicated that the network side device indicates the precoding matrix by means of a bit bitmap when the precoding matrix is indicated by the precoding matrix indication information, and in this case, the terminal may determine the precoding matrix according to the bit bitmap.

Optionally, as an embodiment, when the maximum transmission rank value configured by the network side device is less than or equal to the first preset threshold, the network side device indicates the precoding matrix through the precoding matrix indication information, where the precoding matrix indication information may specifically include M bits, and the M bits may correspond to K precoding indexes, where one precoding index is used to indicate one precoding matrix, and K is a positive integer and less than or equal to 2 ^M. Wherein M is a positive integer and is smaller than the number of transmitting antennas or the number of antenna ports of the terminal, and may specifically relate to a maximum transmission rank value configured by the network side device and/or design of a precoding matrix. Thus, the terminal, when determining the precoding matrix according to the precoding index, may include:

And determining a precoding matrix corresponding to the first index according to a predefined first mapping relation and a first index indicated by M bits, wherein the first mapping relation is a mapping relation between different precoding indexes corresponding to the M bits and different precoding matrices.

Specifically, the protocol may predefine a mapping relationship (i.e., a first mapping relationship) between different precoding indexes corresponding to M bits and different precoding matrices, and when determining the precoding matrix, the terminal may determine, firstly, a precoding index indicated by the M bits (i.e., a first index) based on the value of the M bits in the precoding matrix indication information, and then determine, based on the first index and the predefined first mapping relationship, a precoding matrix corresponding to the first index, where the precoding matrix corresponding to the first index is a precoding matrix indicated by the network side device.

Optionally, as an embodiment, when the maximum transmission rank value configured by the network side device is greater than the first preset threshold, the network side device indicates the precoding matrix through the precoding matrix indication information, where the precoding matrix indication information may specifically include a bit bitmap with N bits, where the bit bitmap is used to indicate the transmission rank value and the antenna port used when the terminal performs data transmission. Wherein N is a positive integer and is equal to the number of transmit antennas or the number of antenna ports of the terminal.

Thus, the terminal, when determining the precoding matrix based on the bit map, may include:

Determining a transmission rank value and an antenna port used when the terminal performs data transmission according to the bit bitmap;

and determining a precoding matrix according to the transmission rank value and the antenna ports.

When the network side equipment indicates the transmission rank value of the terminal for transmitting the uplink data through the bit bitmap of N bits, the network side equipment can indicate through the value of N bits. Specifically, the transmission rank value of the terminal for transmitting the uplink data may be indicated by the number of bits with a value of 1 in the N bits, for example, if the number of bits with a value of 1 in the N bits is 3, the network side device indicates that the transmission rank value of the terminal for transmitting the uplink data is 3. In this way, when determining a transmission rank value for transmitting uplink data according to the bit map, the terminal may include:

and determining the bit number with the value of 1 in the bit bitmap as a transmission rank value when the terminal performs data transmission.

For example, if the number of bits with a value of 1 in the N bits is 3, the terminal may determine that the transmission rank indicated by the network side device is 3.

In one possible implementation manner, when the network side device indicates, through the bit bitmap, a transmission rank value of the terminal for transmitting uplink data, the transmission rank value may also be indicated by using the number of bits with a value of 0 in the N bits. In this way, when determining a transmission rank value for transmitting uplink data according to the bit map, the terminal may include:

And determining the number of bits with the value of 0 in the bit bitmap as a transmission rank value when the terminal performs data transmission.

For example, if the number of bits with a value of 0 in the N bits is 3, the terminal may determine that the transmission rank indicated by the network side device is 3.

It should be noted that, when the network side device indicates, through the bit map, the transmission rank value of the terminal for transmitting uplink data, the indicated transmission rank value is smaller than or equal to N and smaller than or equal to the maximum transmission rank value configured by the network side device, that is, when the terminal determines that the transmission rank value for transmitting uplink data is smaller than or equal to N and smaller than or equal to the maximum transmission rank value configured by the network side device.

When the network side equipment indicates the antenna port used by the terminal for transmitting the uplink data through the bit bitmap of N bits, the network side equipment can also indicate through the value of N bits. Specifically, the N bits may sequentially correspond to the plurality of antenna ports of the terminal according to a specified order, and the network side device may instruct the terminal to use the corresponding antenna ports to perform data transmission by using a bit value of 1, where the specified order may be a left-to-right order or a right-to-left order. In this way, when determining an antenna port used for transmitting uplink data according to the bit map, the terminal may include:

and determining the antenna port corresponding to the bit with the value of 1 in the bit bitmap as the antenna port used by the terminal when the terminal performs data transmission.

For example, if the bit map of N bits is 00110001, the terminal sequentially corresponds to the antenna port 1 to the antenna port 8 of the terminal from left to right, the terminal can determine that the antenna ports used for uplink data transmission are 3,4 and 8, that is, the terminal will select the antenna ports 3,4 and 8 to transmit uplink data.

In one possible implementation manner, when the network side device indicates, through the bit bitmap, an antenna port used by the terminal for transmitting uplink data, the network side device may also be N bits sequentially corresponding to a plurality of antenna ports of the terminal according to a specified order, and indicate, through a bit value of 0, an antenna port used by the terminal for transmitting uplink data. In this way, when determining an antenna port used for transmitting uplink data according to the bit map, the terminal may include:

And determining the antenna port corresponding to the bit with the value of 0 in the bit bitmap as the antenna port used by the terminal when the terminal performs data transmission.

For example, if the bit map of N bits is 11001110, the terminal sequentially corresponds to the antenna port 1 to the antenna port 8 of the terminal from left to right, the terminal may determine that the antenna ports used for uplink data transmission are 3,4, and 8, that is, the terminal may select the antenna ports 3,4, and 8 to transmit uplink data.

After determining a transmission rank value and an antenna port used in uplink data transmission, the terminal may determine a precoding matrix based on the transmission rank value and the antenna port.

After determining the precoding matrix indicated by the network side device, the terminal may perform data transmission based on the precoding matrix indicated by the network side device when transmitting uplink data to the network side device.

In order to facilitate understanding of the method for indicating the precoding matrix provided in the embodiment of the present application, the following description may be given by taking the first embodiment and the second embodiment as examples.

Embodiment one: the network side equipment indicates a precoding matrix to the terminal in a precoding index mode, and the terminal determines the precoding matrix indicated by the network side equipment based on the precoding index.

The terminal has 8 transmitting antennas, the network side equipment configures an 8-port SRS resource for the terminal, the maximum transmission rank value supported by the terminal reporting is equal to 1 (or the maximum transmission rank supported by the terminal reporting is equal to 8, and the maximum transmission rank value configured by the network side equipment is equal to 1), and the first preset threshold is 4. When the network side equipment indicates the precoding matrix to the terminal through the precoding matrix indication information, the network side equipment can indicate the precoding matrix through a precoding index mode.

In the case of indicating the precoding matrix based on the precoding index, the network side device considers that the terminal has 8 transmitting antennas and the maximum transmission rank value configured to the terminal is 1, so that the precoding matrix has 8 maximum, and 3 bits can be used for indication, that is, the precoding matrix indication information can include 3 bits, 3 bits can correspond to 8 precoding indexes, and one precoding index can indicate one precoding matrix. The mapping relationship between the precoding index and the precoding matrix (i.e., the first mapping relationship) may be as shown in the following table 9:

TABLE 9

Assuming that the value of 3 bits contained in the precoding matrix indication information is 010, the terminal may determine that the precoding matrix indicated by the network side device is a precoding matrix corresponding to the precoding index "2

Embodiment two: the network side equipment indicates the precoding matrix to the terminal in a bit bitmap mode, and the terminal determines the precoding matrix indicated by the network side equipment based on the bit bitmap.

The terminal is provided with 8 transmitting antennas, the network side equipment configures an 8-port SRS resource for the terminal, the maximum transmission rank value supported by the terminal in reporting is equal to 8, the maximum transmission rank value configured by the network side equipment is equal to 8, and the first preset threshold is 4. Then, when the network side device indicates the precoding matrix to the terminal through the precoding matrix indication information, the network side device may indicate through an 8-bit map.

When the network side device indicates the precoding matrix through the bit bitmap with 8 bits, the bit values in the bit bitmap can be determined according to the transmission rank value and the antenna port indicated by actual needs, and four cases shown in table 10 can be taken as an example for illustration. The number of bits with a value of 1 in the 8 bits is used for indicating a transmission rank value of the terminal for uplink transmission, the 8 bits sequentially correspond to antenna ports 1 to 8 of the terminal in a left-to-right order, and the bit with a value of 1 is used for indicating data transmission by using the corresponding antenna ports.

Table 10

Bitmap	Transmission rank
		[1 0 0 1 0 0 0 0]	2
[1 0 0 0 0 0 0 1]	2
		[1 0 1 1 0 1 1 0]	5
[1 1 1 1 1 1 1 1]	8
		…

Assuming that the bit map included in the precoding matrix indicator is the bit map [ 100 10000 ] shown in table 10, the terminal may determine that the transmission rank value when the network side device indicates the terminal to transmit uplink data is 2, and use the antenna ports 1 and 4 to transmit data.

Assuming that the bit map included in the precoding matrix indicator is the bit map [ 10000 001 ] shown in table 10, the terminal may determine that the transmission rank value when the network side device indicates the terminal to transmit uplink data is 2, and use the antenna ports 1 and 8 to transmit data.

Assuming that the bit map included in the precoding matrix indicator is the bit map [ 1011 011 0] shown in table 10, the terminal may determine that the transmission rank value when the network side device indicates the terminal to transmit uplink data is 5, and use the antenna ports 1,3, 4, 6 and 7 to transmit data.

Assuming that the bit map included in the precoding matrix indicator is the bit map [ 1111 1111 ] shown in table 10, the terminal may determine that the transmission rank value when the network side device indicates the terminal to transmit uplink data is 5, and use the antenna ports 1 to 8 to transmit data.

When determining the precoding matrix, the terminal takes the bit bitmap [ 100 1000 0] as an example, and the determined precoding matrix is: The precoding matrix indicates the terminal to transmit uplink data using antenna ports 1 and 4, and the transmission rank value is 2.

Based on the first and second embodiments, when the maximum transmission rank value configured by the network side device is less than or equal to the first preset threshold, the precoding matrix may be indicated by using a small number of bits, so as to save signaling overhead, and when the maximum transmission rank value configured by the network side device is greater than the first preset threshold, the precoding matrix (corresponding to the incoherent codebook) may be indicated by using more bits and by using a bit bitmap, so as to reduce complexity.

As shown in fig. 4, an embodiment of the present application provides a method 400 for indicating SRI, which may be performed by a network side device, in other words, the method for indicating SRI may be performed by software or hardware installed in the network side device, and the method for indicating SRI includes the following steps.

S402: the network side equipment sends SRI indication information to the terminal; wherein, when the value of the first parameter is smaller than or equal to the second preset threshold, the SRI indication information is used for indicating the SRI through the index, and the first parameter includes at least one of the following: the maximum transmission rank configured by the network side equipment; the number of single-port sounding reference signal SRS resources configured by the network equipment; and under the condition that the value of the first parameter is larger than the second preset threshold, the SRI indication information is used for indicating SRI through a bit map.

Before the terminal transmits uplink data to the network side device based on the non-codebook, the network side device may send SRI indication information to the terminal to indicate Sounding REFERENCE SIGNAL Resource Index (SRI) to the terminal, where the SRI is used for determining an antenna port used when transmitting the uplink data by the terminal. The terminal here may be a terminal having N transmit antennas, which supports maximum N stream data simultaneous transmission (i.e., maximum transmission rank value=n), where N may be an integer greater than 4, for example, where N may be 8.

In the embodiment of the application, the SRI indication information can indicate the SRI to the terminal in different modes. Specifically, when the value of the first parameter is smaller than or equal to the second preset threshold, the SRI indication information is used for indicating the SRI by means of index, and when the value of the first parameter is larger than the second preset threshold, the SRI indication information is used for indicating the SRI by means of bit map. The first parameter may include a maximum transmission rank configured by the network side device and/or a single port Sounding reference signal (Sounding REFERENCE SIGNAL, SRS) resource number configured by the network side device, where a value of the first parameter is a maximum transmission rank configured by the network side device and/or a single port SRS resource number configured by the network side device. The maximum transmission rank value configured by the network side device is smaller than or equal to the capability of supporting the maximum transmission rank value reported by the terminal (the capability of the network side device that the terminal can report the maximum transmission rank value supported by the network side device before indicating the SRI, the network side device can configure the maximum transmission rank value based on the capability), and the capability of supporting the maximum transmission rank value reported by the terminal is smaller than or equal to the number of transmitting antennas or the number of antenna ports of the terminal. The number of single-port SRS resources configured by the network side equipment is larger than or equal to the maximum transmission rank value configured by the network side equipment.

In this way, when the number of terminal antennas is large, the network side device does not only indicate the SRI by using the index when indicating the SRI to the terminal, but also considers the maximum transmission rank value and/or the single-port SRS resource number configured by the network side device, and indicates the SRI by using the index when the maximum transmission rank value and/or the single-port SRS resource number is less than or equal to the second preset threshold, and indicates the SRI by using the bit map when the maximum transmission rank value and/or the single-port SRS resource number is greater than the second preset threshold, so that the SRI can be flexibly indicated by using different modes, not only reducing signaling overhead, but also reducing complexity.

Alternatively, as an embodiment, the SRI indication information may correspond to an SRI indication field, where the SRI indication field may include a plurality of bits, that is, the SRI indication information may include a plurality of bits, where the plurality of bits are used to indicate the SRI to the terminal by way of an index or bit map. Optionally, when the SRI is indicated by means of an index, the number of the plurality of bits may be smaller than the number of the plurality of bits when the SRI is indicated by means of a bit bitmap, that is, when the maximum transmission rank value configured by the network side device and/or the number of single-port SRS resources are smaller than or equal to the second preset threshold, the network side device may indicate the SRI by means of the smaller number of bits, so that signaling overhead may be reduced, and when the maximum transmission rank value configured by the network side device and/or the number of single-port SRS resources are greater than the second preset threshold, the network side device may indicate the SRI by means of the larger number of bits, so that complexity is reduced.

Optionally, as an embodiment, in a case where the value of the first parameter is smaller than or equal to the second preset threshold, that is, in a case where the maximum transmission rank value configured by the network side device and/or the number of single-port SRS resources is smaller than or equal to the second preset threshold, the SRI indication information may specifically include X bits, where the X bits may correspond to J indexes, where one index is used to indicate one or more SRIs (in a case where the maximum transmission rank value configured by the network side device is equal to 1, one index may be used to indicate one SRI, and where one index may be used to indicate one or more SRIs in a case where the maximum transmission rank value configured by the network side device is greater than 1). Wherein, X is a positive integer, and the specific size of X may be related to the maximum transmission rank value configured by the network side device and the number of single-port SRS resources. Optionally, X may be less than the number of single-port SRS resources configured by the network side device.

Note that J is a positive integer and less than or equal to 2 ^X, that is, each index of 2 ^X indexes corresponding to X bits may be used to indicate SRI (J is equal to 2 ^X), or some indexes are used to indicate SRI, and the rest indexes are not used to indicate SRI (J is less than 2 ^X). For example, if the SRIs have 8 combinations, each of which includes one or more SRIs, and the network side device uses 3 bits to indicate a specific SRI to the terminal, then 8 indexes corresponding to the 3 bits may be used to indicate SRIs, and one index is used to indicate one SRI combination. If the SRIs have 10 combinations, each combination contains one or more SRIs, and the network side device uses 4 bits to indicate a specific SRI to the terminal, then, of 16 indexes corresponding to the 4 bits, 10 indexes can indicate the SRIs, one index is used to indicate one SRI combination, and the other 6 indexes are not used to indicate the SRIs.

Optionally, as an embodiment, in a case where the value of the first parameter is smaller than or equal to the second preset threshold, that is, in a case where the maximum transmission rank value configured by the network side device and/or the number of single-port SRS resources is smaller than or equal to the second preset threshold, the SRI indication information may specifically include a bit map (bitmap) of Y bits, where the bit map may be used to indicate the transmission rank value and the single-port SRS resources according to which the terminal performs uplink data transmission. Wherein Y is a positive integer, and may be specifically equal to the number of single-port SRS resources configured by the network side device. For example, if the network side device configures 8 single port SRS resources, Y may be equal to 8.

When the network side equipment indicates the transmission rank value of the terminal for uplink data transmission through the bit bitmap of Y bits, the network side equipment can indicate through the value of the Y bits. Alternatively, the number of bits of the Y bits with a value of 1 may be used to indicate the transmission rank value. For example, if the bit bitmap of the Y bits is 00110001, the network side device instructs the terminal to perform uplink data transmission with a transmission rank value of 3. In one possible implementation manner, the network side device may also indicate a transmission rank value by using the number of bits with a value of 0 in the Y bits, for example, if the bit bitmap of the Y bits is 11001110, the transmission rank value indicated by the network side device to the terminal is 3. The transmission rank value indicated by the network side equipment through the bit bitmap of the Y bits is smaller than or equal to the maximum transmission rank value configured by the network side equipment.

When the network side equipment indicates the single-port SRS resource according to which the terminal performs uplink data transmission through the bit bitmap of the Y bit, the network side equipment can also indicate through the value of the Y bit. Optionally, the Y bits may sequentially correspond to a plurality of single-port SRS resources configured by the network side device according to a specified order, where a bit value of 1 may be used to indicate data transmission according to the corresponding single-port SRS resource. The specified order may be left-to-right or right-to-left. For example, the bit map of the Y bit is 00110001, and the network side device sequentially corresponds to SRS resources 1 to 8 configured by the network side device from left to right, so that the network side device instructs the terminal to transmit uplink data according to SRS resources 3, 4 and 8, that is, instructs the terminal to transmit uplink data by using antenna ports of SRS resources 3, 4 and 8 before the terminal uses the uplink data. In a possible implementation manner, the network side device may also indicate, by using a bit with a value of 0, SRS resources according to which the terminal transmits uplink data. For example, the bit map of the Y bit is 11001110, and the network side device sequentially corresponds to the SRS resources 1 to 8 configured by the network side device from left to right, and instructs the terminal and the SRS resources 3, 4 and 8 to transmit uplink data, that is, instructs the terminal to transmit uplink data using the antenna ports of the SRS resources 3, 4 and 8 before using.

Optionally, as an embodiment, the second preset threshold may be a positive integer greater than or equal to 1 and less than Y, where Y is the number of SRS resources configured by the network side device. The second preset threshold may in particular be configured or indicated by the network side device or predefined by the protocol.

Optionally, the SRI indicated to the terminal by the network side device through the SRI indication information may correspond to non-codebook transmission, that is, when the terminal transmits uplink data to the network side device based on the non-codebook, the network side device may indicate the SRI to the terminal through the technical solution provided by the embodiment of the present application, so as to reduce signaling overhead and reduce complexity.

In the embodiment of the application, when the network side equipment indicates the SRI to the terminal, the SRI is not indicated in a single index-using mode, but the SRI is flexibly indicated in different modes, so that not only the signaling overhead can be reduced, but also the complexity can be reduced by taking the maximum transmission rank value and/or the single port SRS resource number configured by the network side equipment into consideration.

As shown in fig. 5, an embodiment of the present application provides an SRI indication method 500, which may be performed by a terminal, in other words, by software or hardware installed in the terminal, the SRI indication method including the following steps.

S502: and the terminal receives the SRI indication information sent by the network side equipment.

Before transmitting uplink data to the network side device based on the non-codebook, the terminal may receive the SRI indication information sent by the network side device, so as to determine a single-port SRS resource based on the SRI indication information, and transmit the uplink data using an antenna port used when the single-port SRS resource is previously sent. The terminal here may be a terminal having N transmit antennas, which supports maximum N stream data simultaneous transmission (i.e., maximum transmission rank value=n), where N may be an integer greater than 4, for example, where N may be 8.

In the embodiment of the present application, the SRI indication information may indicate the SRI in different manners. Specifically, when the value of the first parameter is smaller than or equal to the second preset threshold, the SRI indication information is used for indicating the SRI by means of index, and when the value of the first parameter is larger than the second preset threshold, the SRI indication information is used for indicating the SRI by means of bit map. The first parameter may include a maximum transmission rank configured by the network side device and/or a single-port SRS resource number configured by the network side device, where a value of the first parameter is a maximum transmission rank configured by the network side device and/or a single-port SRS resource number configured by the network side device. The maximum transmission rank value configured by the network side device is smaller than or equal to the capability of supporting the maximum transmission rank value reported by the terminal (the capability of the network side device that the terminal can report the maximum transmission rank value supported by the network side device before indicating the SRI, the network side device can configure the maximum transmission rank value based on the capability), and the capability of supporting the maximum transmission rank value reported by the terminal is smaller than or equal to the number of transmitting antennas or the number of antenna ports of the terminal. The number of single-port SRS resources configured by the network side equipment is larger than or equal to the maximum transmission rank value configured by the network side equipment.

The specific implementation of the SRI indication information indicating the SRI by means of an index or bit map may be referred to as corresponding content in the embodiment shown in fig. 4, and will not be described in detail here.

S504: and under the condition that the value of the first parameter is smaller than or equal to a second preset threshold, the terminal determines SRI according to the index, wherein the first parameter comprises at least one of the following: the maximum transmission rank configured by the network side equipment; the number of single-port sounding reference signal SRS resources configured by the network equipment; and under the condition that the value of the first parameter is larger than the second preset threshold, the terminal determines SRI according to the bit map.

After receiving the SRI indication information sent by the network side device, the terminal can determine the SRI indicated by the network side device according to the SRI indication information, so that when the terminal transmits uplink data to the network side device, the terminal can use an antenna port used when sending SRS resources corresponding to the SRI to perform data transmission.

In the embodiment of the present application, when determining the SRI according to the SRI indication information, the terminal may include:

Determining whether the value of the first parameter is smaller than or equal to a second preset threshold;

Determining an SRI based on the index under the condition that the value of the first parameter is smaller than or equal to a second preset threshold;

and determining the SRI based on the bit map under the condition that the value of the first parameter is larger than a second preset threshold.

Specifically, the second preset threshold may be configured or indicated by the network side device, or predefined by the protocol, and the maximum transmission rank value and/or the number of single-port SRS resources included in the first parameter are also configured by the network side device, so that when the terminal determines the SRI according to the SRI indication information, it may be determined whether the value of the first parameter is less than or equal to the second preset threshold, that is, whether the maximum transmission rank value and/or the number of single-port SRS resources configured by the network side device is less than or equal to the second preset threshold. If the maximum transmission rank value and/or the number of single-port SRS resources is less than or equal to the second preset threshold, it may be indicated by the index when the network side device indicates the SRI through the SRI indication information, and in this case, the terminal may determine the SRI based on the index. If the maximum transmission rank value and/or the number of single-port SRS resources is greater than the second preset threshold, it may be indicated that the network side device indicates the SRI by means of a bit map when the SRI indication information indicates the SRI, and in this case, the terminal may determine the SRI based on the bit map.

Optionally, as an embodiment, when the value of the first parameter is smaller than or equal to the second preset threshold, that is, when the maximum transmission rank value configured by the network side device and/or the number of single-port SRS resources is smaller than or equal to the second preset threshold, the network side device indicates SRI through the SRI indication information, the SRI indication information may specifically include X bits, where the X bits may correspond to J indexes, and one index is used to indicate one or more SRIs, and J is a positive integer and smaller than or equal to 2 ^X. Wherein, X is a positive integer, is related to the maximum transmission rank value configured by the network side equipment and the single-port SRS resource number, and is smaller than the single-port SRS resource number. Thus, when determining an SRI from an SRI, the terminal may include:

And determining SRI corresponding to the second index according to a predefined second mapping relation and a second index indicated by the X bits, wherein the second mapping relation is the mapping relation between different indexes corresponding to the X bits and different SRI.

Specifically, the protocol may predefine a mapping relationship (i.e., a second mapping relationship) between different indexes corresponding to X bits and different SRIs, when determining the SRIs, the terminal may first determine the index indicated by the X bits (i.e., the second index) based on the value of the X bits in the SRI indication information, and then determine, based on the second index and the predefined second mapping relationship, the SRIs corresponding to the second index, where the SRIs corresponding to the second index are the SRIs indicated by the network side device.

Optionally, as an embodiment, when the value of the first parameter is greater than the second preset threshold, that is, when the maximum transmission rank value configured by the network side device and/or the number of single-port SRS resources is greater than the second preset threshold, the network side device indicates SRI through the SRI indication information, the SRI indication information may specifically include a bit bitmap of Y bits, where the bit bitmap is used to indicate the transmission rank value and the single-port SRS resources according to which the terminal performs data transmission. Wherein Y is a positive integer and is equal to the number of single-port SRS resources configured by the network side equipment. Thus, when determining the SRI according to the bit map, the terminal may include:

Determining a transmission rank value and a single-port SRS resource according to the bit bitmap when the terminal performs data transmission;

and determining SRI according to the transmission rank value of the terminal during data transmission and the single-port SRS resource according to the transmission rank value.

When the network side equipment indicates the transmission rank value of the terminal for transmitting the uplink data through the bit bitmap of the Y bits, the network side equipment can indicate through the value of the Y bits. Specifically, the transmission rank value of the terminal for transmitting the uplink data may be indicated by the number of bits with a value of 1 in the Y bits, for example, if the number of bits with a value of 1 in the Y bits is 3, the network side device indicates that the transmission rank value of the terminal for transmitting the uplink data is 3. In this way, when determining a transmission rank value for transmitting uplink data according to the bit map, the terminal may include:

For example, if the number of bits with a value of 1 in the Y bits is 3, the terminal may determine that the transmission rank indicated by the network side device is 3.

In one possible implementation manner, when the network side device indicates, through the bit bitmap, a transmission rank value of the terminal for transmitting uplink data, the transmission rank value may also be indicated by using the number of bits with a value of 0 in the Y bits. In this way, when determining a transmission rank value for transmitting uplink data according to the bit map, the terminal may include:

It should be noted that, when the network side device indicates, through the bit bitmap, the transmission rank value of the terminal for transmitting the uplink data, the indicated transmission rank value is smaller than or equal to Y and smaller than or equal to the maximum transmission rank value configured by the network side device, that is, when the terminal determines that the transmission rank value for transmitting the uplink data is smaller than or equal to Y and smaller than or equal to the maximum transmission rank value configured by the network side device.

When the network side equipment indicates the SRS resource according to which the terminal transmits the uplink data through the bit bitmap of the Y bits, the network side equipment can also indicate through the value of the Y bits. Specifically, the Y bits may sequentially correspond to the plurality of single-port SRS resources configured by the network side device according to a specified order, where the network side device may instruct, by using a bit value of 1, the terminal to perform data transmission according to the corresponding single-port SRS resource, and the specified order may be a left-to-right order or a right-to-left order. In this way, when determining SRS resources according to which uplink data is transmitted according to the bit map, the terminal may include:

and determining the SRS resource corresponding to the bit with the value of 1 in the bit bitmap as a single-port SRS resource according to which the terminal performs data transmission.

For example, if the bit map of the Y bits is 00110001, and the SRS resources 1 to 8 are sequentially configured corresponding to the network side device from left to right, the terminal may determine that the SRS resources according to which the uplink data transmission is performed are SRS resources 3, 4 and 8, that is, the terminal may transmit the uplink data using the antenna ports used when the terminal previously transmitted the SRS resources 3, 4 and 8.

In one possible implementation manner, when the network side device indicates, through the bit bitmap, the SRS resource according to which the terminal transmits the uplink data, the SRS resource configured by the network side device may be sequentially corresponding to Y bits according to the specified order, and the bit value is 0 to indicate, by the network side device, that the terminal performs data transmission according to the corresponding single-port SRS resource. In this way, when determining SRS resources according to which uplink data is transmitted according to the bit map, the terminal may include:

For example, if the bit map of the Y bit is 11001110, and the SRS resources 1 to 8 are sequentially configured corresponding to the network side device from left to right, the terminal may determine that the SRS resources according to which the uplink data transmission is performed are SRS resources 3, 4 and 8, that is, the terminal may use the antenna ports used when the terminal previously transmitted the SRS resources 3, 4 and 8 to transmit the uplink data.

After determining the transmission rank value and the SRS resource according to which uplink data transmission is performed, the terminal may determine the SRI based on the transmission rank value and the SRS resource.

After determining the SRI indicated by the network side device, the terminal may perform data transmission by using an antenna port used when the SRS resource corresponding to the SRI is sent before when transmitting uplink data to the network side device.

In order to facilitate understanding of the SRI indication method provided in the embodiments of the present application, the following description may be given by taking the third embodiment and the fourth embodiment as examples.

Embodiment III: the network side equipment indicates the SRI to the terminal in an index mode, and the terminal determines the SRI indicated by the network side equipment based on the index.

The terminal has 8 transmitting antennas, the network side equipment configures 4 single-port SRS resources for the terminal, the maximum transmission rank value supported by the terminal in reporting is equal to 3, the maximum transmission rank value configured by the network side equipment is equal to 2, and the second preset threshold is 4. Then, when the network side device indicates the SRI to the terminal through the SRI indication information, the indication can be performed by means of an index.

In the case of indicating SRI based on the index, the network side device considers that the number of single-port SRS resources configured by the network side device is 4 and the maximum transmission rank value configured to the terminal is 2, so the SRI may correspond to 10 combinations, and may use 4 bits for indication, that is, the SRI indication information may include 4 bits, and the 4 bits may correspond to 16 indexes, where 10 indexes may be used to indicate SRIs and one index may be used to indicate 1 or 2 SRIs. The mapping relationship between the index and the SRI (i.e., the second mapping relationship) may be as shown in the following table 11:

TABLE 11

Bit field mapped to index	SRI(s),N_SRS＝4
		0	0 (Rank=1)
1	1 (Rank=1)
		2	2 (Rank=1)
3	3 (Rank=1)
		4	0,1 (Rank=2)
5	0,2 (Rank=2)
		6	0,3 (Rank=2)
7	1,2 (Rank=2)
		8	1,3 (Rank=2)
9	2,3 (Rank=2)
		10-15	reserved

In table 11, SRI(s) is one or more SRIs indicated by the network side device, SRIs correspond to SRS resources one by one, and N _SRS is the number of single-port SRS resources configured by the network side device.

Assuming that the value of 4 bits included in the SRI indication information is 0100, the terminal may determine that the SRIs indicated by the network side device are SRI0 and SRI1 corresponding to the index "4", and when transmitting uplink data, the terminal may transmit the first stream data using an antenna port used when transmitting SRS resources corresponding to SRI0 before, and transmit the second stream data using an antenna port used when transmitting SRS resources corresponding to SRI1 before.

Embodiment four: the network side equipment indicates the SRI to the terminal in a bit bitmap mode, and the terminal determines the SRI indicated by the network side equipment based on the bit bitmap.

The terminal is provided with 8 transmitting antennas, the network side equipment configures 8 single-port SRS resources for the terminal, the maximum transmission rank value supported by the terminal in reporting is equal to 8, the maximum transmission rank value configured by the network side equipment is equal to 8, and the first preset threshold is 4. Then, when the network side device indicates the SRI to the terminal through the SRI indication information, the indication may be performed through an 8-bit bitmap.

When the network side device indicates the SRI through the bit bitmap with 8 bits, the bit value in the bit bitmap may be determined according to the transmission rank value and the SRS resource indicated by the actual needs, which may be illustrated by taking four cases as examples shown in table 12. The number of bits with a value of 1 in the 8 bits is used for indicating a transmission rank value of uplink transmission of the terminal, the 8 bits sequentially correspond to single-port SRS resources 1 to 8 configured by the network side equipment according to the left-to-right sequence, and the bit with a value of 1 is used for indicating data transmission according to the corresponding SRS resources.

Table 12

Bitmap	Indicated SRI
		[1 0 0 1 0 0 0 0]	SRI0，SRI3
[1 0 0 0 0 0 0 1]	SRI0，SRI7
		[1 0 1 1 0 1 1 0]	SRI0，SRI2，SRI3，SRI5，SRI6
[1 1 1 1 1 1 1 1]	SRI0，SRI1，SRI2，SRI3，SRI4，SRI5，SRI6，SRI7
		…

Assuming that the bit bitmap included in the SRI indication information is the bit bitmap [ 100 10000 ] shown in table 12, the terminal may determine that the transmission rank value when the network side device indicates that the terminal transmits uplink data is 2, and perform data transmission according to SRS resource 1 and SRS resource 4, that is, determine that the SRIs indicated by the network side device are SRI0 (corresponding to SRS resource 1) and SRI3 (corresponding to SRS resource 4), when the terminal transmits uplink data, the terminal may transmit first stream data using an antenna port used when the terminal previously transmits SRS resource 1 corresponding to SRI0, and transmit second stream data using an antenna port used when the terminal previously transmits SRS resource 4 corresponding to SRI 3.

Similarly, assuming that the bit map included in the SRI indication information is another bit map shown in table 12, the terminal may determine the SRI based on the same method, and when transmitting uplink data, perform data transmission using an antenna port used when transmitting SRS resources corresponding to the SRI, which is not illustrated here.

Based on the third and fourth embodiments, it can be known that, when the maximum transmission rank value and/or the number of single-port SRS resources configured by the network side device are smaller than or equal to the second preset threshold, a small number of bits may be used to indicate the SRI, so as to save signaling overhead, and when the maximum transmission rank value and/or the number of single-port SRS resources configured by the network side device are greater than the second preset threshold, more bits may be used to indicate the SRI by means of a bit map, so as to reduce complexity.

Optionally, in the scenario that multiple panels simultaneously transmit data, the capability of the maximum transmission rank value supported by the terminal is limited. For example, in the case of a terminal having 8 antennas, dividing the 8 antennas into 2 groups results in 2 panels, and the maximum transmission rank value supported by each panel is 4. In this scenario, when the network side device instructs the terminal to perform uplink transmission based on the non-codebook, the method may further include:

Configuring one or more SRS resource sets through radio resource control (Radio Resource Control, RRC), each of which may include one or more single-port SRS resources;

The maximum transmission Rank value (max Rank) is configured by RRC or the bit length of the domain indicating SRS resources is Z is configured by RRC.

Alternatively, the terminal may receive a medium access control unit (Medium Access Control Control Element, MAC CE), which may indicate a maximum of L SRS resources, L may be equal to a maximum transmission rank value configured by the network side device through RRC, or L may be equal to 2 ^Z.

Optionally, the terminal may further receive downlink control information (Downlink Control Information, DCI), where Q bits of a domain used to indicate SRS resources in the DCI correspond to L SRS resources in the MAC CE, respectively. Optionally, in the Q bits, a bit value of 1 indicates that the SRS resource corresponding to the bit is used for PUSCH transmission.

In the scenario that multiple panels send data simultaneously, the network side device may indicate the SRI for non-codebook transmission to the terminal through the indication method of the SRI provided in the embodiment of the present application, and specifically, reference may be made to the embodiments shown in fig. 4 and fig. 5, which are not described in detail herein.

According to the indicating method of the precoding matrix provided by the embodiment of the application, the execution main body can be an indicating device of the precoding matrix. In the embodiment of the present application, an example of a method for indicating a precoding matrix performed by an indicating device for a precoding matrix is described.

According to the SRI indicating method provided by the embodiment of the application, the execution main body can be an SRI indicating device. In the embodiment of the present application, an example of a method for executing SRI by using an SRI indicating device is described.

Fig. 6 is a schematic structural diagram of an indicating apparatus for a precoding matrix according to an embodiment of the present application, where the apparatus may correspond to a network side device in other embodiments. As shown in fig. 6, the apparatus 600 includes the following modules.

A sending module 601, configured to send precoding matrix indicator information to a terminal;

Optionally, as an embodiment, in a case where the maximum transmission rank value is less than or equal to the first preset threshold, the precoding matrix indication information includes M bits, where the M bits correspond to K precoding indexes, and one precoding index is used to indicate one precoding matrix, and the K is less than or equal to 2 ^M.

Optionally, as an embodiment, the M is a positive integer and is smaller than the number of transmitting antennas or the number of antenna ports of the terminal.

Optionally, as an embodiment, in a case that the maximum transmission rank value is greater than the first preset threshold, the precoding matrix indication information includes a bit bitmap of N bits, where the bit bitmap is used to indicate a transmission rank value and an antenna port used when the terminal performs data transmission.

Optionally, as an embodiment, the N is a positive integer and is equal to the number of transmit antennas or the number of antenna ports of the terminal.

Optionally, as an embodiment, the number of bits with a value of 1 in the N bits is used to indicate the transmission rank value.

Optionally, as an embodiment, the N bits sequentially correspond to a plurality of antenna ports of the terminal according to a specified order, and a bit value of 1 is used to indicate that the corresponding antenna port is used for data transmission.

Optionally, as an embodiment, the first preset threshold is configured or indicated by the network side device, or the first preset threshold is predefined by a protocol.

Optionally, as an embodiment, the precoding matrix indicated by the precoding matrix indication information corresponds to a non-coherent codebook.

The apparatus 600 according to the embodiment of the present application may refer to the flow of the method 200 corresponding to the embodiment of the present application, and each unit/module in the apparatus 600 and the other operations and/or functions described above are respectively for implementing the corresponding flow in the method 200, and may achieve the same or equivalent technical effects, which are not described herein for brevity.

Fig. 7 is a schematic structural diagram of an indicating device of a precoding matrix according to an embodiment of the present application, which may correspond to a terminal in other embodiments. As shown in fig. 7, the apparatus 700 includes the following modules.

A receiving module 701, configured to receive precoding matrix indication information sent by a network side device;

A determining module 702, configured to determine a precoding matrix according to a precoding index when the maximum transmission rank value configured by the network side device is less than or equal to a first preset threshold; and determining a precoding matrix according to the bit bitmap under the condition that the maximum transmission rank value is larger than the first preset threshold.

Optionally, as an embodiment, in a case where the maximum transmission rank value is less than or equal to the first preset threshold, the precoding matrix indication information includes M bits, where the M bits correspond to K precoding indexes, and one precoding index is used to indicate one precoding matrix, and the K is less than or equal to 2 ^M;

wherein, the determining module 702 is configured to:

and determining a precoding matrix corresponding to the first index according to a predefined first mapping relation and a first index indicated by the M bits, wherein the first mapping relation is a mapping relation between different precoding indexes corresponding to the M bits and different precoding matrices.

Optionally, as an embodiment, when the maximum transmission rank value is greater than the first preset threshold, the precoding matrix indication information includes a bit bitmap with N bits, where the bit bitmap is used to indicate a transmission rank value and an antenna port used when the terminal performs data transmission;

wherein, the determining module 702 is configured to:

Determining a transmission rank value and an antenna port used when the terminal performs data transmission according to the bit map;

and determining a precoding matrix according to the transmission rank value and the antenna port.

Optionally, as an embodiment, the number of bits with a value of 1 in the N bits is used to indicate the transmission rank value;

wherein, the determining module 702 is configured to:

Optionally, as an embodiment, the N bits sequentially correspond to a plurality of antenna ports of the terminal according to a specified order, and a bit value of 1 is used to indicate that the corresponding antenna port is used for data transmission;

wherein, the determining module 702 is configured to:

And determining an antenna port corresponding to the bit with the value of 1 in the bit map as the antenna port used when the terminal performs data transmission.

The apparatus 700 according to the embodiment of the present application may refer to the flow of the method 300 corresponding to the embodiment of the present application, and each unit/module in the apparatus 700 and the other operations and/or functions described above are respectively for implementing the corresponding flow in the method 300, and may achieve the same or equivalent technical effects, which are not described herein for brevity.

Fig. 8 is a schematic structural diagram of an indication apparatus of an SRI according to an embodiment of the present application, which may correspond to a network side device in other embodiments. As shown in fig. 8, the apparatus 800 includes the following modules.

A sending module 801, configured to send sounding reference signal resource index SRI indication information to a terminal;

Optionally, as an embodiment, in a case where the value of the first parameter is less than or equal to the second preset threshold, the SRI indication information includes X bits, where the X bits correspond to J indexes, and one index is used to indicate one or more SRIs, and the J is less than or equal to 2 ^X.

Optionally, as an embodiment, the X is a positive integer, related to the maximum transmission rank value and the single port SRS resource number, and is smaller than the single port SRS resource number.

Optionally, as an embodiment, in a case that the value of the first parameter is greater than the second preset threshold, the SRI indication information includes a bit bitmap of Y bits, where the bit bitmap is used to indicate a transmission rank value and a single-port SRS resource according to which the terminal performs data transmission.

Optionally, as an embodiment, the Y is a positive integer and is equal to the number of single-port SRS resources.

Optionally, as an embodiment, the number of bits with a value of 1 in the Y bits is used to indicate the transmission rank value.

Optionally, as an embodiment, the Y bits sequentially correspond to the plurality of single-port SRS resources configured by the network side device according to a specified order, and a bit value of 1 is used to indicate data transmission according to the corresponding single-port SRS resources.

Optionally, as an embodiment, the second preset threshold is configured or indicated by the network side device, or the second preset threshold is predefined by a protocol.

Optionally, as an embodiment, the SRI indicated by the SRI indication information corresponds to a non-codebook transmission.

The apparatus 800 according to the embodiment of the present application may refer to the flow of the method 400 corresponding to the embodiment of the present application, and each unit/module in the apparatus 800 and the other operations and/or functions described above are respectively for implementing the corresponding flow in the method 400, and may achieve the same or equivalent technical effects, which are not described herein for brevity.

Fig. 9 is a schematic structural diagram of an indication device of an SRI according to an embodiment of the present application, which may correspond to a terminal in other embodiments. As shown in fig. 9, the apparatus 900 includes the following modules.

A receiving module 901, configured to receive SRI indication information sent by a network side device;

A determining module 902, configured to determine, according to the index, the SRI if the value of the first parameter is less than or equal to a second preset threshold, where the first parameter includes at least one of: the maximum transmission rank configured by the network side equipment; the number of single-port sounding reference signal SRS resources configured by the network equipment; and under the condition that the value of the first parameter is larger than the second preset threshold, the terminal determines SRI according to the bit map.

Optionally, as an embodiment, in a case that the value of the first parameter is less than or equal to the second preset threshold, the SRI indication information includes X bits, where the X bits correspond to J indexes, and one index is used to indicate one or more SRIs, and the J is less than or equal to 2 ^X;

Wherein, the determining module 902 is configured to:

And determining SRI corresponding to the second index according to a predefined second mapping relation and a second index indicated by the X bits, wherein the second mapping relation is a mapping relation between different indexes corresponding to the X bits and different SRI.

Optionally, as an embodiment, when the value of the first parameter is greater than the second preset threshold, the SRI indication information includes a bit bitmap of Y bits, where the bit bitmap is used to indicate a transmission rank value and a single-port SRS resource according to which the terminal performs data transmission;

Wherein, the determining module 902 is configured to:

Determining a transmission rank value when the terminal performs data transmission according to the bit map, and a single-port SRS resource according to the transmission rank value;

And determining SRI according to the transmission rank value and the single-port SRS resource according to which the terminal performs data transmission.

Optionally, as an embodiment, the number of bits with a value of 1 in the Y bits is used to indicate the transmission rank value;

Wherein, the determining module 902 is configured to:

Optionally, as an embodiment, the Y bits sequentially correspond to the plurality of single-port SRS resources configured by the network side device according to a specified order, and a bit value of 1 is used to indicate data transmission according to the corresponding single-port SRS resources;

Wherein, the determining module 902 is configured to:

The apparatus 900 according to the embodiment of the present application may refer to the flow of the method 500 corresponding to the embodiment of the present application, and each unit/module in the apparatus 900 and the other operations and/or functions described above are respectively for implementing the corresponding flow in the method 500, and may achieve the same or equivalent technical effects, which are not described herein for brevity.

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

The indicating device for the precoding matrix provided by the embodiment of the present application can implement each process implemented by the embodiments of the methods of fig. 2 to 3, and achieve the same technical effects, and for avoiding repetition, a detailed description is omitted here.

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

The SRI indicating device provided by the embodiment of the present application can implement each process implemented by the embodiments of the methods of fig. 4 to 5, and achieve the same technical effects, and for avoiding repetition, a detailed description is omitted herein.

Optionally, as shown in fig. 10, the embodiment of the present application further provides a communication device 1000, including a processor 1001 and a memory 1002, where the memory 1002 stores a program or an instruction that can be executed on the processor 1001, for example, when the communication device 1000 is a terminal, the program or the instruction is executed by the processor 1001 to implement each step of the foregoing embodiment of the method for indicating a precoding matrix, or implement each step of the foregoing embodiment of the method for indicating an SRI, and achieve the same technical effect. When the communication device 1000 is a network side device, the program or the instruction, when executed by the processor 1001, implements each step of the foregoing precoding matrix indication method embodiment, or implements each step of the foregoing SRI indication method embodiment, and can achieve the same technical effect, so that repetition is avoided, and no further description is given here.

The embodiment of the application also provides a terminal, which comprises a processor and a communication interface, wherein the communication interface is used for receiving precoding matrix indication information sent by the network side equipment; the processor is configured to determine a precoding matrix according to a precoding index when a maximum transmission rank value configured by the network side device is less than or equal to a first preset threshold; and determining a precoding matrix according to the bit bitmap under the condition that the maximum transmission rank value is larger than the first preset threshold. Or the communication interface is used for receiving SRI indication information sent by the network side equipment; the processor is configured to determine the SRI according to the index if the value of the first parameter is less than or equal to a second preset threshold, where the first parameter includes at least one of: the maximum transmission rank configured by the network side equipment; the number of single-port sounding reference signal SRS resources configured by the network equipment; and under the condition that the value of the first parameter is larger than the second preset threshold, determining SRI according to the bit map. The terminal embodiment corresponds to the terminal-side method embodiment, and each implementation process and implementation manner of the method embodiment can be applied to the terminal embodiment, and the same technical effects can be achieved. Specifically, fig. 11 is a schematic diagram of a hardware structure of a terminal for implementing an embodiment of the present application.

The terminal 1100 includes, but is not limited to: at least part of the components of the radio frequency unit 1101, the network module 1102, the audio output unit 1103, the input unit 1104, the sensor 1105, the display unit 1106, the user input unit 1107, the interface unit 1108, the memory 1109, and the processor 1110, etc.

Those skilled in the art will appreciate that the terminal 1100 may further include a power source (e.g., a battery) for supplying power to the respective components, and the power source may be logically connected to the processor 11 through a power management system, so as to perform functions of managing charge, discharge, power consumption management, etc. through the power management system. The terminal structure shown in fig. 11 does not constitute a limitation of the terminal, and the terminal may include more or less components than shown, or may combine some components, or may be arranged in different components, which will not be described in detail herein.

It should be appreciated that in embodiments of the present application, the input unit 1104 may include a graphics processing unit (Graphics Processing Unit, GPU) 11041 and a microphone 11042, the graphics processor 11041 processing image data of still pictures or video obtained by an image capturing device (e.g., a camera) in a video capturing mode or an image capturing mode. The display unit 1106 may include a display panel 11061, and the display panel 11061 may be configured in the form of a liquid crystal display, an organic light emitting diode, or the like. The user input unit 1107 includes at least one of a touch panel 11071 and other input devices 11072. The touch panel 11071 is also referred to as a touch screen. The touch panel 11071 may include two parts, a touch detection device and a touch controller. Other input devices 11072 may include, but are not limited to, a physical keyboard, function keys (e.g., volume control keys, switch keys, etc.), a trackball, a mouse, a joystick, and so forth, which are not described in detail herein.

In the embodiment of the present application, after receiving downlink data from the network side device, the radio frequency unit 1101 may transmit the downlink data to the processor 1110 for processing; in addition, the radio frequency unit 1101 may send uplink data to the network side device. Typically, the radio frequency unit 1101 includes, but is not limited to, an antenna, an amplifier, a transceiver, a coupler, a low noise amplifier, a duplexer, and the like.

Memory 1109 may be used to store software programs or instructions and various data. The memory 1109 may mainly include a first memory area storing programs or instructions and a second memory area storing data, wherein the first memory area may store an operating system, application programs or instructions (such as a sound playing function, an image playing function, etc.) required for at least one function, and the like. Further, the memory 1109 may include volatile memory or nonvolatile memory, or the memory 1109 may include both volatile and nonvolatile memory. The nonvolatile Memory may be a Read-Only Memory (ROM), a Programmable ROM (PROM), an Erasable PROM (EPROM), an Electrically Erasable EPROM (EEPROM), or a flash Memory. The volatile memory may be random access memory (Random Access Memory, RAM), static random access memory (STATIC RAM, SRAM), dynamic random access memory (DYNAMIC RAM, DRAM), synchronous Dynamic Random Access Memory (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 random access memory (DRRAM). Memory 1109 in embodiments of the present application includes, but is not limited to, these and any other suitable types of memory.

Processor 1110 may include one or more processing units; optionally, the processor 1110 integrates an application processor that primarily processes operations involving an operating system, user interface, application programs, and the like, and a modem processor that primarily processes wireless communication signals, such as a baseband processor. It will be appreciated that the modem processor described above may not be integrated into the processor 1110.

The radio frequency unit 1101 is configured to receive precoding matrix indication information sent by a network side device; a processor 1110, configured to determine a precoding matrix according to a precoding index when a maximum transmission rank value configured by the network side device is less than or equal to a first preset threshold; and determining a precoding matrix according to the bit bitmap under the condition that the maximum transmission rank value is larger than the first preset threshold.

Or a radio frequency unit 1101, configured to receive SRI indication information sent by a network side device; a processor 1110, configured to determine, according to the index, the SRI if the value of the first parameter is less than or equal to a second preset threshold, where the first parameter includes at least one of: the maximum transmission rank configured by the network side equipment; the number of single-port sounding reference signal SRS resources configured by the network equipment; and under the condition that the value of the first parameter is larger than the second preset threshold, determining SRI according to the bit map.

The embodiment of the application also provides network side equipment which comprises a processor and a communication interface, wherein the communication interface is used for sending precoding matrix indication information to the terminal; the precoding matrix indication information is used for indicating a precoding matrix through a precoding index when the maximum transmission rank value configured by the network side equipment is smaller than or equal to a first preset threshold; and when the maximum transmission rank value is greater than the first preset threshold, the precoding matrix indication information is used for indicating a precoding matrix through a bit bitmap. Or the communication interface is used for sending SRI indication information to the terminal; wherein, when the value of the first parameter is smaller than or equal to the second preset threshold, the SRI indication information is used for indicating the SRI through the index, and the first parameter includes at least one of the following: maximum transmission rank configured by the network side equipment; the number of single-port sounding reference signal SRS resources configured by the network equipment; and under the condition that the value of the first parameter is larger than the second preset threshold, the SRI indication information is used for indicating SRI through a bit map. The network side device embodiment corresponds to the network side device method embodiment, and each implementation process and implementation manner of the method embodiment can be applied to the network side device embodiment, and the same technical effects can be achieved.

Specifically, the embodiment of the application also provides network side equipment. As shown in fig. 12, the network side device 1200 includes: an antenna 121, a radio frequency device 122, a baseband device 123, a processor 124, and a memory 125. The antenna 121 is connected to a radio frequency device 122. In the uplink direction, the radio frequency device 122 receives information via the antenna 121, and transmits the received information to the baseband device 123 for processing. In the downlink direction, the baseband device 123 processes information to be transmitted, and transmits the processed information to the radio frequency device 122, and the radio frequency device 122 processes the received information and transmits the processed information through the antenna 121.

The method performed by the network side device in the above embodiment may be implemented in the baseband apparatus 123, where the baseband apparatus 123 includes a baseband processor.

The baseband apparatus 123 may, for example, include at least one baseband board, where a plurality of chips are disposed, as shown in fig. 12, where one chip, for example, a baseband processor, is connected to the memory 125 through a bus interface, so as to invoke a program in the memory 125 to perform the network device operation shown in the above method embodiment.

The network-side device may also include a network interface 126, such as a common public radio interface (common public radio interface, CPRI).

Specifically, the network side device 1200 of the embodiment of the present invention further includes: instructions or programs stored in the memory 125 and executable on the processor 124, the processor 124 invokes the instructions or programs in the memory 125 to perform the methods performed by the modules shown in fig. 6 and achieve the same technical effects, and are not repeated here.

The embodiment of the present application further provides a readable storage medium, where a program or an instruction is stored on the readable storage medium, where the program or the instruction implements each process of the foregoing precoding matrix indication method embodiment or each process of the foregoing SRI indication method embodiment when executed by a processor, and the process can achieve the same technical effect, so that repetition is avoided and redundant description is omitted herein.

Wherein the processor is a processor in the terminal described in the above embodiment. The readable storage medium includes computer readable storage medium such as computer readable memory ROM, random access memory RAM, magnetic or optical disk, etc.

The embodiment of the 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 for running a program or an instruction, implementing each process of the above precoding matrix indication method embodiment, or implementing each process of the above SRI indication method embodiment, and achieving the same technical effect, so that repetition is avoided, and no further description is provided herein.

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

The embodiments of the present application further provide a computer program/program product stored in a storage medium, where the computer program/program product is executed by at least one processor to implement each process of the foregoing precoding matrix indication method embodiment or implement each process of the foregoing SRI indication method embodiment, and achieve the same technical effects, so that repetition is avoided and no further description is given here.

The embodiment of the application also provides an indicating system of the precoding matrix, which comprises: a terminal and a network side device, the terminal being operable to perform the steps of the method of the embodiment shown in fig. 3 above, and the network side device being operable to perform the steps of the method of the embodiment shown in fig. 2 above.

The embodiment of the application also provides an indication system of the SRI, which comprises the following steps: a terminal and a network side device, the terminal being operable to perform the steps of the method of the embodiment shown in fig. 5 above, and the network side device being operable to perform the steps of the method of the embodiment shown in fig. 4 above.

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

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

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

Claims

1. An indication method of a precoding matrix, comprising:

2. The method of claim 1, wherein the step of determining the position of the substrate comprises,

And under the condition that the maximum transmission rank value is smaller than or equal to the first preset threshold, the precoding matrix indication information comprises M bits, the M bits correspond to K precoding indexes, one precoding index is used for indicating one precoding matrix, and the K is smaller than or equal to 2 ^M.

3. The method of claim 2, wherein the step of determining the position of the substrate comprises,

And M is a positive integer and is smaller than the number of sending antennas or the number of antenna ports of the terminal.

4. The method of claim 1, wherein the step of determining the position of the substrate comprises,

And under the condition that the maximum transmission rank value is greater than the first preset threshold, the precoding matrix indication information comprises a bit bitmap with N bits, and the bit bitmap is used for indicating the transmission rank value and the used antenna port when the terminal performs data transmission.

5. The method of claim 4, wherein the step of determining the position of the first electrode is performed,

And N is a positive integer and is equal to the number of sending antennas or the number of antenna ports of the terminal.

6. The method of claim 4, wherein the step of determining the position of the first electrode is performed,

And the bit number with the value of 1 in the N bits is used for indicating the transmission rank value.

7. The method of claim 4, wherein the step of determining the position of the first electrode is performed,

And the N bits sequentially correspond to the plurality of antenna ports of the terminal according to the appointed sequence, and the bit value of 1 is used for indicating the use of the corresponding antenna ports for data transmission.

8. The method of claim 1, wherein the step of determining the position of the substrate comprises,

The first preset threshold is configured or indicated by the network side device, or the first preset threshold is predefined by a protocol.

9. The method of claim 1, wherein the step of determining the position of the substrate comprises,

And the precoding matrix indicated by the precoding matrix indication information corresponds to a noncoherent codebook.

10. An indication method of a precoding matrix, comprising:

11. The method according to claim 10, wherein in case the maximum transmission rank value is less than or equal to the first preset threshold, the precoding matrix indication information comprises M bits, the M bits correspond to K precoding indexes, one precoding index is used to indicate one precoding matrix, and the K is less than or equal to 2 ^M;

wherein the determining, by the terminal, a precoding matrix according to the precoding index includes:

12. The method of claim 11, wherein the step of determining the position of the probe is performed,

13. The method according to claim 10, wherein, in the case that the maximum transmission rank value is greater than the first preset threshold, the precoding matrix indication information includes a bit map of N bits, where the bit map is used to indicate a transmission rank value and an antenna port used when the terminal performs data transmission;

the method for determining the precoding matrix by the terminal according to the bit bitmap comprises the following steps:

14. The method of claim 13, wherein a number of bits of the N bits that are 1 is used to indicate the transmission rank value;

the determining, according to the bit map, a transmission rank value when the terminal performs data transmission includes:

15. The method of claim 13, wherein the N bits sequentially correspond to a plurality of antenna ports of the terminal in a specified order, and a bit value of 1 is used to indicate data transmission using the corresponding antenna ports;

the determining, according to the bit map, an antenna port used when the terminal performs data transmission includes:

16. The method of claim 13, wherein the step of determining the position of the probe is performed,

17. The method of claim 10, wherein the step of determining the position of the first electrode is performed,

18. The method of claim 10, wherein the step of determining the position of the first electrode is performed,

19. A method for indicating SRI, comprising:

the network side equipment sends SRI indication information to the terminal;

20. The method of claim 19, wherein the step of determining the position of the probe comprises,

And under the condition that the value of the first parameter is smaller than or equal to the second preset threshold, the SRI indication information comprises X bits, the X bits correspond to J indexes, one index is used for indicating one or more SRIs, and the J is smaller than or equal to 2 ^X.

21. The method of claim 20, wherein the step of determining the position of the probe is performed,

And X is a positive integer, is related to the maximum transmission rank value and the single-port SRS resource number, and is smaller than the single-port SRS resource number.

22. The method of claim 19, wherein the step of determining the position of the probe comprises,

And under the condition that the value of the first parameter is larger than the second preset threshold, the SRI indication information comprises a bit bitmap of Y bits, and the bit bitmap is used for indicating a transmission rank value and single-port SRS resources according to which the terminal performs data transmission.

23. The method of claim 22, wherein the step of determining the position of the probe is performed,

And Y is a positive integer and is equal to the number of the single-port SRS resources.

24. The method of claim 22, wherein the step of determining the position of the probe is performed,

And the number of bits with the value of 1 in the Y bits is used for indicating the transmission rank value.

25. The method of claim 22, wherein the step of determining the position of the probe is performed,

And the Y bits sequentially correspond to the plurality of single-port SRS resources configured by the network side equipment according to the appointed sequence, and the bit value of 1 is used for indicating to carry out data transmission according to the corresponding single-port SRS resources.

26. The method of claim 19, wherein the step of determining the position of the probe comprises,

The second preset threshold is configured or indicated by the network side device, or the second preset threshold is predefined by a protocol.

27. The method of claim 19, wherein the step of determining the position of the probe comprises,

And the SRI indicated by the SRI indication information corresponds to non-codebook transmission.

28. A method for indicating SRI, comprising:

29. The method of claim 28, wherein in the case that the value of the first parameter is less than or equal to the second preset threshold, the SRI indication information includes X bits, where the X bits correspond to J indexes, one index being used to indicate one or more SRIs, and the J is less than or equal to 2 ^X;

Wherein, the terminal determines the SRI according to the index, and the method comprises the following steps:

30. The method of claim 29, wherein the step of providing the first information comprises,

31. The method of claim 28, wherein, if the value of the first parameter is greater than the second preset threshold, the SRI indication information includes a bit bitmap of Y bits, where the bit bitmap is used to indicate a transmission rank value and a single-port SRS resource according to which the terminal performs data transmission;

wherein, the terminal determines the SRI according to the bit bitmap, comprising:

32. The method of claim 31, wherein a number of bits of the Y bits that are 1 is used to indicate the transmission rank value;

33. The method of claim 31, wherein the Y bits sequentially correspond to the plurality of single-port SRS resources configured by the network side device in a specified order, and a bit value of 1 is used for indicating data transmission according to the corresponding single-port SRS resources;

the determining, according to the bit map, a single-port SRS resource according to which the terminal performs data transmission includes:

34. The method of claim 31, wherein the step of determining the position of the probe is performed,

35. The method of claim 28, wherein the step of providing the first information comprises,

36. The method of claim 28, wherein the step of providing the first information comprises,

37. An indicating device for a precoding matrix, comprising:

38. An indicating device for a precoding matrix, comprising:

39. An indication device for SRI, comprising:

40. An indication device for SRI, comprising:

41. A terminal comprising a processor and a memory storing a program or instructions executable on the processor, which when executed by the processor, performs the steps of the method of indicating a precoding matrix as claimed in any one of claims 10 to 18, or the steps of the method of indicating an SRI as claimed in any one of claims 28 to 36.

42. A network side device comprising a processor and a memory storing a program or instructions executable on the processor, which when executed by the processor, performs the steps of the method of indicating a precoding matrix as claimed in any one of claims 1 to9, or performs the steps of the method of indicating an SRI as claimed in any one of claims 19 to 27.

43. A readable storage medium, characterized in that the readable storage medium has stored thereon a program or instructions which, when executed by a processor, implement the steps of the method of indicating a precoding matrix according to any one of claims 1 to 9, or the steps of the method of indicating a precoding matrix according to any one of claims 10 to 18, or the steps of the method of indicating an SRI according to any one of claims 19 to 27, or the steps of the method of indicating an SRI according to any one of claims 28 to 36.