CN117856841A

CN117856841A - Method and device for determining precoding matrix

Info

Publication number: CN117856841A
Application number: CN202211387758.6A
Authority: CN
Inventors: 宋磊; 黄秋萍; 高秋彬
Original assignee: Datang Mobile Communications Equipment Co Ltd
Current assignee: Datang Mobile Communications Equipment Co Ltd
Priority date: 2022-09-30
Filing date: 2022-11-07
Publication date: 2024-04-09

Abstract

The invention provides a method and a device for determining a precoding matrix, wherein the method comprises the following steps: receiving downlink control information DCI; the DCI includes a target indication field; determining a precoding matrix corresponding to the target indication domain according to the DCI; the precoding matrix is used for transmitting a physical uplink shared channel PUSCH scheduled by the DCI. The method and the device for determining the precoding matrix are used for determining the precoding matrix by the terminal equipment according to the indication of the network side equipment, and are convenient for dynamic switching of PUSCH transmission among different transmission modes.

Description

Method and device for determining precoding matrix

Technical Field

The present invention relates to the field of communications technologies, and in particular, to a method and an apparatus for determining a precoding matrix.

Background

In a 5G New Radio (NR) communication system, a terminal device may configure a plurality of antenna panels (panels).

In the Rel-17 version of the communication standard, for uplink transmission of multiple (TRansmission Point, TRP) transmission points, for example, the terminal device may use the same or different antenna panels to transmit the same PUSCH to 2 TRPs at 2 or more transmission occasions, i.e. transmit the PUSCH by means of time division multiplexing (Time Division Multiplexing, TDM). In Rel-17 version, simultaneous transmission by multiple antenna panels is not supported, i.e., PUSCH transmission according to space division multiplexing (Space Division Multiplexing, SDM) scheme is not supported. With the increase of data rate and reliability performance requirements of terminal devices, it is necessary to standardize simultaneous transmission of multiple antenna panels in uplink.

In the process of carrying out standardization on simultaneous transmission of a plurality of uplink antenna panels, how a terminal device determines a precoding matrix according to an instruction of a network side device, so that dynamic switching of PUSCH transmission between an SDM transmission mode and a TDM transmission mode is a technical problem to be solved.

Disclosure of Invention

The invention provides a method and a device for determining a precoding matrix, which are used for solving the problem that how a terminal device determines the precoding matrix according to the indication of network side equipment in the prior art, so that PUSCH transmission can be switched between different transmission modes (for example, SDM transmission mode and TDM transmission mode) dynamically.

In a first aspect, the present invention provides a method for determining a precoding matrix, including:

receiving downlink control information DCI; the DCI includes a target indication field;

determining a precoding matrix corresponding to the target indication domain according to the DCI; the precoding matrix is used for transmitting a physical uplink shared channel PUSCH scheduled by the DCI.

In some embodiments, the DCI further includes a first indication field; determining a precoding matrix corresponding to the target indication domain according to the DCI, including:

acquiring a target transmission layer number according to the first indication domain;

and determining a precoding matrix corresponding to the target indication domain according to the target transmission layer number.

In some embodiments, the first indication field comprises a target transport layer number indication;

the target transport layer number is the transport layer number indicated by the target transport layer number indication.

In some embodiments, the first indication field further includes a channel sounding reference signal, SRS, resource set indication corresponding to the target transmission layer number indication;

the target number of transport layers indicates that the number of transport layers indicated is 0, or 1, or more, or reserved.

In some embodiments, the first indication field includes a sum of a number of transport layers corresponding to the target indication field and a number of transport layers corresponding to the second indication field;

the target transmission layer number is equal to the transmission layer number indicated by the first indication domain and the difference value of the transmission layer number indicated by the second indication domain.

In some embodiments, the first indication field includes a first identifier, where the first identifier indicates whether a number of transmission layers corresponding to the target indication field is the same as a number of transmission layers corresponding to the second indication field, and the number of transmission layers of the target is equal to the number of transmission layers corresponding to the target indication field.

In some embodiments, in a case where the first indication field is an antenna port indication field, acquiring the target number of transmission layers according to the first indication field includes:

determining a first layer number of the PUSCH according to the antenna port indication domain;

And determining the target transmission layer number according to the transmission layer number corresponding to the first layer number and the second indication domain.

In some embodiments, the target transport layer number is equal to the transport layer number indicated by the second indication field.

In some embodiments, the target indication field is a second transmit precoding indication TPMI field, or a second sounding reference signal resource indication SRI field;

in the case that the target indication domain is the second TPMI domain, the second indication domain is the first TPMI domain; in the case where the target indication field is a second SRI field, the second indication field is the first SRI field.

In some embodiments, the method further comprises:

and according to the precoding matrix and according to the indication or target transmission mode of the network side equipment, sending a Physical Uplink Shared Channel (PUSCH) scheduled by the DCI.

In some embodiments, the sounding reference signal, SRS, resource set indication in the DCI is used to indicate a target transmission mode.

In some embodiments, the target transmission mode is any one of the following:

a space division multiplexing SDM transmission mode;

a time division multiplexing TDM transmission mode;

a single frequency network SFN transmission mode; or (b)

Frequency division multiplexing FDM transmission scheme.

In some embodiments, the target transmission mode is determined to be an SDM transmission mode when at least one of the following is satisfied:

The repetition number of the time domain resource allocation domain TDRA domain indication is equal to a first preset value;

the code points corresponding to the first indication domain are the code points in a first preset code point set;

the first indication domain indicates the number of transmission layers corresponding to the target indication domain;

the number of transmission layers indicated by the target indication domain is the same as the number of transmission layers indicated by the second indication domain; or (b)

And receiving first indication information, wherein the first indication information indicates that the target transmission mode is an SDM transmission mode.

In some embodiments, the targeted transport is determined to be TDM transport when at least one of the following is satisfied:

the repetition number of the time domain resource allocation domain TDRA domain indication is larger than a first preset value;

the code points corresponding to the first indication domain are the code points in the second preset code point set;

the first indication domain does not indicate the number of transmission layers corresponding to the target indication domain;

the number of transmission layers indicated by the target indication domain is different from the number of transmission layers indicated by the second indication domain; or (b)

And receiving second indication information, wherein the second indication information indicates that the target transmission mode is a TDM transmission mode.

In some embodiments, the first indication field is an SRS resource set indication field in DCI, or a preset indication field, or a first TPMI field, or a first SRI field.

In some embodiments, when the target transmission mode is a TDM transmission mode, determining, according to DCI, a precoding matrix corresponding to the target indication field includes:

determining a precoding matrix corresponding to a target indication domain according to first M bits or first N code points of any one domain of a second TPMI domain, a first TPMI domain, a second SRI domain and a first SRI domain in DCI;

the target indication domain is a second TPMI domain or a second SRI domain, M is less than or equal to K, N is less than 2 to the power of K, and K is equal to the bit width of the indication domain where the first M bits or the first N code points are located.

In some embodiments, the DCI further includes an antenna port indication field, and the method further includes:

and determining the number of transmission layers included in the relevant list corresponding to the antenna port indication domain.

In some embodiments, the number of transmission layers included in the correlation list corresponding to the antenna port indication field is determined based on any one of:

the sum of the transmission layer number indicated by the first TPMI domain and the transmission layer number indicated by the SRS resource set indication domain in the DCI;

the sum of the number of transmission layers indicated by the first SRI domain and the number of transmission layers indicated by the SRS resource set indication domain in the DCI;

the SRS resource set indicates the transmission layer number indicated by the domain;

the transmission layer number indicated by the first TPMI domain in the DCI and the first identifier;

The transmission layer number indicated by the first SRI domain in the DCI and the first identifier;

the sum of the transmission layer number indicated by the first TPMI domain and the transmission layer number indicated by the preset indication domain in DCI;

the sum of the number of transmission layers indicated by the first SRI domain and the number of transmission layers indicated by a preset indication domain in DCI;

1 transmission layer number or a plurality of transmission layer numbers indicated by a first TPMI domain in DCI;

determining 1 or more transmission layers indicated by a first SRI domain in DCI;

the sum of the transmission layer number indicated by the first TPMI domain and the transmission layer number indicated by the second TPMI domain in the DCI; or (b)

The sum of the number of transmission layers indicated by the first SRI field and the number of transmission layers indicated by the second SRI field in the DCI.

In a second aspect, the present invention provides a terminal device, including: memory, transceiver, processor;

a memory for storing a computer program;

a transceiver for transceiving data under the control of the processor;

a processor for reading the computer program in the memory and performing the following operations: receiving downlink control information DCI; the DCI includes a target indication field;

In some embodiments, the DCI further includes a first indication field; the processor is specifically configured to:

In some embodiments, in the case that the first indication field is an antenna port indication field, the processor is specifically configured to:

In some embodiments, the processor is further to:

In some embodiments, the target transmission mode is any one of the following:

a space division multiplexing SDM transmission mode;

a time division multiplexing TDM transmission mode;

A single frequency network SFN transmission mode; or (b)

Frequency division multiplexing FDM transmission scheme.

In some embodiments, in the case where the target transmission mode is a TDM transmission mode, the processor is specifically configured to:

In some embodiments, the DCI further includes an antenna port indication field, and the processor is further configured to:

In some embodiments, in a case where the target transmission mode is one of the SDM transmission mode, the SFN transmission mode, or the FDM transmission mode, the processor is further configured to:

and determining the bit width of the target indication domain according to the DCI.

In some embodiments, the bit width of the target indication field is any one of:

a total bit width of the first TPMI domain and the second TPMI domain in the DCI;

A total bit width of the first SRI domain and the second SRI domain in the DCI;

the sum of the bit width of the first TPMI domain in the DCI and the preset bit width;

the sum of the bit width of the first SRI domain and the preset bit width in the DCI;

a difference between a bit width of a first TPMI field in the DCI and a preset bit width;

a difference between a bit width of a first SRI field in the DCI and a preset bit width;

the maximum bit width of the first TPMI domain and the bit width of the second TPMI domain in the DCI;

the minimum bit width of the first TPMI domain and the bit width of the second TPMI domain in the DCI;

the maximum bit width of the first SRI domain and the bit width of the second SRI domain in the DCI; or (b)

The minimum bit width of the first SRI field and the bit width of the second SRI field in the DCI.

In some embodiments, in a case where the target transmission mode is any one of the SDM transmission mode, the SFN transmission mode, or the FDM transmission mode, and the target indication domain is at least any one of a preset information domain, a first SRI domain, a second SRI domain, a first TPMI domain, or a second TPMI domain, the processor is specifically configured to perform any one of the following:

Determining a precoding matrix corresponding to the target indication domain based on the first M bits of the target indication domain;

determining a precoding matrix corresponding to the target indication domain based on the last M bits of the target indication domain;

determining a precoding matrix corresponding to the target indication domain based on the first N code points of the target indication domain; or (b)

Determining a precoding matrix corresponding to the target indication domain based on the last N code points of the target indication domain;

determining a precoding matrix corresponding to the target indication domain based on the target indication domain;

wherein M and N are integers greater than or equal to 1, respectively.

In some embodiments, the processor is further configured to perform at least one of:

acquiring a first maximum transmission layer and a second maximum transmission layer, and determining a target transmission layer number based on the sum of the first maximum transmission layer and the second maximum transmission layer; or (b)

And acquiring a third maximum transmission layer number, and determining two target transmission layer numbers based on the third maximum transmission layer number according to a predefined rule or an indication of network side equipment.

In some embodiments, the sum of the two target transport layers is equal to the third maximum transport layer number;

The two target transmission layers comprise the respective maximum layers of two third indication domains in the DCI, wherein the third indication domains are TPMI domains or SRI domains;

the maximum layer number of each of the two third indication domains is any one of the following:

are specific values, which are indicated by the predefined rules or the network side device;

when the third maximum transmission layer number is smaller than or equal to a second preset value, the third maximum transmission layer number is a first integer and a second integer respectively, wherein the first integer is a minimum integer which is larger than or equal to the ratio of the third maximum transmission layer number to the preset value; or (b)

And when the third maximum transmission layer number is smaller than or equal to a second preset value, respectively a third integer and a fourth integer, wherein the third integer is a maximum integer which is smaller than or equal to the ratio of the third maximum transmission layer number to the preset value.

In some embodiments, the processor is specifically configured to:

determining a corresponding target SRS resource set according to a transmission mode indicated by the network side equipment;

and determining a precoding matrix corresponding to the target indication domain according to the target SRS resource set and the target indication domain in the DCI.

In some embodiments, the processor is specifically configured to:

Under the condition that the network side equipment indication terminal sends the PUSCH based on a first transmission mode, determining a precoding matrix corresponding to a target indication domain based on a first target set configured by the network side equipment and the target indication domain in the DCI; or,

under the condition that the network side equipment indication terminal sends the PUSCH based on a second transmission mode, determining a precoding matrix corresponding to a target indication domain based on a second target set configured by the network side equipment and the target indication domain in the DCI;

the first transmission mode is a TDM transmission mode, an SFN transmission mode or an FDM transmission mode;

wherein the second transmission mode is an SDM transmission mode;

wherein the first set of targets is any one of:

the method comprises the steps that a network side device configures first M SRS resource sets in a plurality of SRS resource sets;

a set associated with the first transmission mode determined based on configuration information of the SRS resource set;

an SRS resource set associated with the first transmission mode;

a preset set associated with the first transmission mode; or (b)

A SRS resource set or a set indicated by a first target set index included in configuration authorization sent by network side equipment;

Wherein the second set of targets is any one of:

the last M SRS resource sets of the plurality of SRS resource sets;

a set of the second transmission mode association determined based on configuration information of the SRS resource set;

an SRS resource set associated with the second transmission mode;

a preset set associated with the second transmission mode; or (b)

A SRS resource set or a set indicated by a second target set index included in configuration authorization sent by network side equipment;

m is an integer greater than or equal to 1.

In a third aspect, the present invention provides a device for determining a precoding matrix, including:

a receiving module, configured to receive downlink control information DCI; the DCI includes a target indication field;

a determining module, configured to determine, according to DCI, a precoding matrix corresponding to a target indication domain; the precoding matrix is used for transmitting a physical uplink shared channel PUSCH scheduled by the DCI.

In some embodiments, the DCI further includes a first indication field; the determining module is specifically configured to:

In some embodiments, in the case that the first indication field is an antenna port indication field, the determining module is specifically configured to:

In some embodiments, further comprising:

and the sending module is used for sending the Physical Uplink Shared Channel (PUSCH) scheduled by the DCI according to the precoding matrix and the indication of the network side equipment or the target transmission mode.

In some embodiments, the target transmission mode is any one of the following:

a space division multiplexing SDM transmission mode;

a time division multiplexing TDM transmission mode;

a single frequency network SFN transmission mode; or (b)

Frequency division multiplexing FDM transmission scheme.

In some embodiments, in the case where the target transmission mode is a TDM transmission mode, the determining module is specifically configured to:

In some embodiments, the DCI further includes an antenna port indication field, and the determining module is further configured to:

In some embodiments, in a case where the target transmission mode is one of the SDM transmission mode, the SFN transmission mode, or the FDM transmission mode, the determining module is further configured to:

a total bit width of the first SRI domain and the second SRI domain in the DCI;

In some embodiments, in a case where the target transmission mode is any one of the SDM transmission mode, the SFN transmission mode, or the FDM transmission mode, and the target indication domain is at least any one of a preset information domain, a first SRI domain, a second SRI domain, a first TPMI domain, or a second TPMI domain, the determining module is specifically configured to:

determining a precoding matrix corresponding to the target indication domain based on the first N code points of the target indication domain;

Determining a precoding matrix corresponding to the target indication domain based on the last N code points of the target indication domain; or (b)

wherein M and N are integers greater than or equal to 1, respectively.

In some embodiments, the determining module is further to:

In some embodiments, the determining module is specifically configured to:

Wherein the second transmission mode is an SDM transmission mode;

wherein the first set of targets is any one of:

an SRS resource set associated with the first transmission mode;

a preset set associated with the first transmission mode; or (b)

wherein the second set of targets is any one of:

the last M SRS resource sets of the plurality of SRS resource sets;

an SRS resource set associated with the second transmission mode;

a preset set associated with the second transmission mode; or (b)

m is an integer greater than or equal to 1.

In a fourth aspect, the present invention provides a processor-readable storage medium storing a computer program for causing a processor to execute the method of determining the precoding matrix of any one of the first aspects.

In a fifth aspect, the present invention provides a computer program product comprising a computer program which, when executed by a processor, implements the method of determining a precoding matrix of any one of the first aspects.

The invention provides a method and a device for determining a precoding matrix, wherein the method determines the precoding matrix corresponding to a target indication domain according to DCI, so that the problem that terminal equipment determines the precoding matrix according to indication of network side equipment is solved, and dynamic switching of PUSCH transmission between different transmission modes is facilitated.

Drawings

In order to more clearly illustrate the invention or the technical solutions of the prior art, the following description will briefly explain the drawings used in the embodiments or the description of the prior art, and it is obvious that the drawings in the following description are some embodiments of the invention, and other drawings can be obtained according to the drawings without inventive effort for a person skilled in the art.

Fig. 1 is a flow chart of a method for determining a precoding matrix provided by the present invention;

fig. 2 is a schematic structural diagram of a device for determining a precoding matrix provided by the present invention;

fig. 3 is a schematic entity structure of a terminal device provided by the present invention.

Detailed Description

In the embodiment of the application, the term "and/or" describes the association relationship of the association objects, which means that three relationships may exist, for example, a and/or B may be represented: a exists alone, A and B exist together, and B exists alone. The character "/" generally indicates that the context-dependent object is an "or" relationship. The term "plurality" in the embodiments of the present application means two or more, and other adjectives are similar thereto.

The term "plurality" in embodiments of the present invention means two or more, and other adjectives are similar.

The following description of the embodiments of the present invention will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments, but not all embodiments of the present invention. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.

In the related art, in the process of normalizing simultaneous transmission of multiple uplink antenna panels, how a terminal device can determine a precoding matrix according to an indication of a network side device, so that dynamic switching of PUSCH transmission between an SDM transmission mode and a TDM transmission mode is a technical problem to be solved.

In order to solve the technical problems in the related art, the present invention provides a method for determining a precoding matrix, so that a terminal device can determine the precoding matrix according to an indication of a network device, thereby facilitating dynamic switching between different transmission modes (for example, an SDM transmission mode and a TDM transmission mode) of PUSCH transmission,

the method for determining the precoding matrix provided by the invention is described below with reference to specific embodiments.

Fig. 1 is a flow chart of a method for determining a precoding matrix provided by the present invention. As shown in fig. 1, the method includes:

step 101, receiving downlink control information (Downlink Control Information, DCI); the DCI includes a target indication field.

Optionally, the execution body of the method for determining the precoding matrix provided by the invention may be a terminal device, or may be a device for determining the precoding matrix set in the terminal device, where the device for determining the precoding matrix may be implemented by a combination of software and/or hardware.

Alternatively, the target indication field may be a second transmit precoding indication (Precoding information and number of layers or Precoding Information, TPMI) field or a second sounding reference signal resource indication (Sounding Reference Signal resource indicator, SRI) field. For example, when the network side configures the terminal to perform PUSCH transmission based on a codebook (codebook), the target indication domain is a second TPMI domain; when the network side configures the terminal to perform PUSCH transmission of a non-codebook (non-codebook), the target indication domain is a second SRI domain.

Step 102, determining a precoding matrix corresponding to a target indication domain according to DCI; the precoding matrix is used to transmit a DCI scheduled physical uplink shared channel (Physical Uplink Shared Channel, PUSCH).

According to the method for determining the precoding matrix provided in fig. 1, the precoding matrix corresponding to the target indication domain is determined according to the DCI, so that the technical problem of how the terminal equipment determines the precoding matrix according to the indication of the network side equipment in the related art, so that the PUSCH transmission can be dynamically switched between different transmission modes (for example, an SDM transmission mode and a TDM transmission mode) is solved.

In order to facilitate dynamic switching of PUSCH transmission between different transmission modes, so that a terminal device can determine a precoding matrix according to DCI, in the present invention, bit widths of an SRI field and/or a TPMI field in DCI in different transmission modes may be made the same. For example, to thereby facilitate dynamic switching of PUSCH transmissions between TDM transmission modes and SDM transmission modes, it is necessary to have the SRI field and/or TPMI field in the DCI in the SDM transmission mode have the same bit width as the SRI field and/or TPMI field in the DCI in the TDM transmission mode.

Among them, the following modes 1 to 6 are guarantee that the SRI field and/or TPMI field in DCI in different transmission modes (e.g., TDM transmission mode and SDM transmission mode) are the same indication mode. Alternatively, the target transport layer number is the target transport layer number mentioned in any one of the following modes 1 to 6.

Optionally, the different transmission modes may include any at least two of:

a TDM transmission scheme;

SDM transmission mode;

-single frequency network (Single Frequency Network, SFN) transmission mode; or (b)

Frequency division multiplexing (Frequency Division Multiplexing, FDM) transmission scheme.

Alternatively, the first indication field may be a target indication field.

Mode 1, a first indication field includes an indication of the number of target transmission layers;

Further, the first indication domain further includes a channel sounding reference signal SRS resource set indication corresponding to the target transmission layer number indication; the target number of transport layers indicates that the number of transport layers indicated is 0, or 1, or more, or reserved.

For example, the target transport layer number may be 2 layers, i.e., the number of target transport layer number indication indications is 1; the number of target transport layers may also be 1 layer and 2 layers, i.e. the number of target transport layer indication indications is 2. Wherein, the SRS resource set indication refers to correspondence indication between at most 2 SRI domains or at most 2 TPMI domains and at most 2 SRS resource sets.

Alternatively, on the basis of mode 1, one possible scenario of the first indication field is as shown in table 1 below.

TABLE 1

Alternatively, on the basis of mode 1, still another possible scenario of the first indication field is shown in table 2 below.

TABLE 2

Alternatively, in the above table 2, the mapping of the bit fields to the indexes (may also be referred to as code points) 0 to 3 may indicate the TDM transmission manner, and the code points 4 to 6 may indicate the SDM transmission manner. When the SRS resource set indication is performed using more than 2 bits (i.e. more than 4 bit domain mapping index values), if the network side configures or instructs the terminal to perform TDM transmission, the terminal will only parse the first 2 bits (i.e. MSB, most significant bit), and ignore other bits of the information domain.

Alternatively, on the basis of mode 3, still another possible scenario of the first indication field is shown in table 3 or table 4 or table 5 below.

TABLE 3 Table 3

TABLE 4 Table 4

TABLE 5

In the related art, in a case where the number of 2 antenna panel (panel) transmission layers does not exceed layer 4 in a codebook (codebook) -based PUSCH transmission, the combination of 2 antenna panel transmission layers may be a combination of 1+2, 2+1, 1+1, 2+2, 1+3, 3+1, 0+1, 1+0, 0+2, 2+0, 0+3, 3+0, 0+4, 4+0, and the like. Where 0+x or x+0 represents a single antenna panel transmission, + represents a combination, in which case code points 0 or 1 in tables 1-6 may be used, and other combinations may be represented using other code points, such as code points 2 or 3 in table 6 below. When the terminal receives an indication of an SRS resource set indication field (also called an indication field) in the DCI signaling as 0 or 1, it is determined that only one SRI field (the first SRI field or the second SRI field) or one TPMI field (the first TPMI field or the second TPMI field) is effective according to the SRS resource set indication in the indication field, that is, the number of precoding layers corresponding to the other SRI field or the TPMI field is 0. In the present invention, the first SRI domain may also be simply referred to as an SRI domain, and the first TPMI domain may also be simply referred to as a TPMI domain.

In the TDM transmission mode, code points 2 and 3 represent that the correspondence between the first SRI domain, the first TPMI domain, the second SRI domain, the second TPMI domain and the SRS resource set indication is the same, but the corresponding beam information is different. In the SDM transmission mode, the code points 2 and 3 may correspond to different transmission layers. In the TDM transmission scheme, the code points 0 and 1 each represent a reserved transmission layer number, and the code points 0 and 1 correspond to different transmission points (TRansmission Point, TRP), so in the SDM transmission scheme, the code points 0 and 1 do not need to indicate the transmission layer number corresponding to the target indication field. In the case where the combination of the 2 antenna panel transmission layers may be a combination of 1+2, 2+1, 1+1, 2+2, 1+3, 3+1, 0+1, 1+0, 0+2, 2+0, 0+3, 3+0, 0+4, 4+0, etc., one possible case of the first indication field is as shown in table 1.

TABLE 6

In order to facilitate dynamic switching between the SDM transmission scheme and the TDM transmission scheme, the above table 1 may further include code points 0, 1, 2, and 3 corresponding to the TDM transmission scheme, code points 4, 5, 6, and 7 corresponding to the SDM transmission scheme, and the above table 2 may further include code points 4, 5, 6, and 7 corresponding to the SDM transmission scheme. Table 2 exemplarily shows one possible indication method of the first indication field. In the case that the code points are 0, 1, 2, and 3, the first indication field does not indicate the number of transmission layers, and at this time, the terminal device may determine to transmit PUSCH based on the TDM transmission mode. In the case of code points 4, 5, and 6, the first indication field indicates the number of transmission layers, and the terminal device may determine to transmit PUSCH based on the SDM transmission mode.

In the case where SDM transmission does not support layer 3 or layer 4 transmission, table 2 may be further simplified as follows in table 7.

TABLE 7

In table 2 above, since the number of precoding matrices corresponding to the transmission layer number 3 (indicated by the target transmission layer number) is relatively small, a plurality of transmission layer numbers (2 and 3, or 1 and 3) may also be corresponding to one code point in the first indication field. In the case that one code point in the first indication domain corresponds to a plurality of transmission layers, which layer is specifically used by the terminal device to transmit PUSCH, there may be further indication by the target indication domain. Tables 8 and 9 exemplarily show the possible cases where one code point in the first indication domain corresponds to a plurality of transport layers.

TABLE 8

TABLE 9

In the case where the SDM transmission scheme and the TDM transmission scheme cannot be dynamically switched by the first indication field based on the first indication field in table 8 or table 9, the SDM transmission scheme and the TDM transmission scheme may be dynamically switched based on the PUSCH repetition transmission times indicated by the time domain resource allocation (Time Domain Resource Allocation, TDRA) field. When the number of the PUSCH repeated transmission indicated by the TDRA domain is greater than 1, the PUSCH repeated transmission according to the TDM transmission mode is carried out, and the terminal equipment carries out interpretation on the first indication domain according to the corresponding interpretation method of the TDM transmission mode; when the number of PUSCH repeated transmission indicated by the TDRA domain is equal to 1, it indicates that PUSCH repeated transmission according to the SDM transmission mode is performed, and the terminal device performs interpretation on the first indication domain according to the interpretation method corresponding to the SDM transmission mode.

If the SRS resource set indication field indication method in table 2 is used, the SDM and TDM schemes may be dynamically switched directly by the SRS resource set indication field, for example, when the bit field is mapped to indexes 0, 1, 2, and 3, the TDM-based PUSCH repetition transmission is indicated. When the bit field maps to indexes 4, 5, and 6, SDM transmission is indicated. At this time, the terminal device does not need to determine the transmission scheme according to the repetition number indication in the TDRA domain. The indication method can further support a transmission scheme of SDM+TDM. For example, when the number of PUSCH repetition times indicated by the TDRA field is greater than 1 and the bit field is mapped to indexes 4, 5, 6, and 7, the terminal device determines that SDM-based PUSCH multi-panel simultaneous transmission is performed in each slot or sub-slot at this time, and the transmission performs TDM-based PUSCH repetition transmission in a plurality of slots or sub-slots.

Optionally, in the case that the plurality of transmission layers are indicated jointly in other information domains (such as SRS resource set indication domain), the precoding matrix corresponding to the plurality of combined layers in the corresponding second TPMI domain may also be indicated jointly. For example, in PUSCH repetition transmission based on TDM transmission scheme, in case of 4 antenna ports, cyclic prefix orthogonal frequency division multiplexing (Cyclic Prefix Orthogonal Frequency Division Multiplexing, CP-OFDM) waveform, maximum transmission layer number is 2 or 3 or 4, and there is no configuration parameter (e.g., ul-fullflowersmission) or the parameter is configured as first specific information (e.g., fullflowmode 2 or fullflower), the second TPMI field indicates as shown in the following table 10, each transmission layer number is independently indicated. For example, in case of joint indication of two different transport layers, joint coding is required.

Table 10

In the invention, the codebook subset is codebook subset, and is fully, partially and incoherently fullyAntipartialAndNON Coherent, partially and incoherently partialAndNON Coherent, incoherently nonCoherent and reserved as reserved.

When codebook subset=fullyand partialand dnoneparty, layers 2 and 3 may be combined such that the number of precoding matrices does not exceed the bit width of the second TPMI domain in the TDM transmission scheme, and table 11 gives an example of bit domain to TPMI index mapping in the case of layer 2 and layer 3 joint indication.

TABLE 11

Similarly, in the case of codebook subset=partialanddnoncoupler, table 12 gives an example of bit field to TPMI index mapping in the case of layer 1 and layer 3 joint indication.

Table 12

Alternatively, in the case where the configuration of the codebook subset is different, the indication meaning of the corresponding first indication field may also be different. For example, in the case of codebook subset=fullypartial and dnoncomponent, the method of indicating the first indication field in table 8 is adopted, and in the case of codebook subset=partialand dnoncomponent, the method of indicating the first indication field in table 9 is adopted, so that the bit width of the target indication field (for example, the second TPMI field) corresponding to the SDM transmission scheme is ensured not to exceed the bit width of the target indication field (for example, the second TPMI field) corresponding to the TDM transmission scheme.

Optionally, since the number of precoding matrices corresponding to layer 1 is large and other layer combinations may result in an increase in the bit width of the target indication field (e.g., the second TPMI field), the number of precoding matrices corresponding to layer 1 may also be reduced, so as to ensure that the bit width of the target indication field corresponding to the SDM transmission mode (e.g., the second TPMI field) is the same as the bit width of the target indication field corresponding to the TDM transmission mode, see table 13. Table 13 exemplarily shows an indication method of layer 1 and layer 3 combination in the case of codebook subset=fullyand partialand layer 3, where TPMI corresponding to layer 1 is deleted to be equal to 25 or 26 or 27, so as to ensure that the joint indication is performed by layer 1 and layer 3 in the case of different codebook subset values.

TABLE 13

Similarly, the TPMI corresponding to layer 3 may be deleted to be equal to 4 or 5 or 6 (considering that layer 3 transmission does not require higher precoding accuracy), so that the number of precoding combinations of layer 1 and layer 3 does not exceed the number of precoding matrices specified in the TDM transmission scheme, as shown in table 14.

TABLE 14

Similarly, table 15 gives one example of bit field to TPMI index mapping at the time of layer 2 and layer 3 indication in the case of codebook subset=partialandnetwork index. The tpmi=13 corresponding to layer 2 in the TDM transmission manner is deleted, so as to ensure that the combined indication of layer 2 and layer 3 is performed under the condition that the values of the codebook subsets are different.

TABLE 15

Similarly, tpmi=2 corresponding to layer 3 may be deleted (considering that layer 3 transmission does not require higher precoding accuracy), to ensure that the number of precoding combinations of layer 2 and layer 3 does not exceed the number of precoding matrices specified in the TDM transmission scheme, as shown in table 16.

Table 16

Bit field mapping to index	Codebook subset = partial and incoherent
		0	Layer 1 tpmi=0
…	…
		11	Layer 1 tpmi=11
12-15	Layer 1 reservation
		0	Layer 2 tpmi=0
…	…
		13	Layer 2 tpmi=13
14	Layer 3 tpmi=0
		15	Layer 3 tpmi=1

In the case where only a partial layer number of combinations is supported, for example, combinations of 1+3, 3+1, 0+3, 3+0, 0+4, 4+0, etc. are not supported, and only combinations of 1+2, 2+1, 1+1, 2+2, 0+1, 1+0, 0+2, 2+0, etc. are supported, the first indication field may still be maintained at 2 bits, and SRS resource set indication is as shown in table 17 below.

TABLE 17

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Mode 2, the first indication domain includes a sum of a number of transmission layers corresponding to the target indication domain and a number of transmission layers corresponding to the second indication domain;

In mode 2, the terminal device may calculate the target transport layer number (the transport layer number of the precoding matrix indicated by the target transport layer number is the target indication domain at this time) according to the sum of the transport layer numbers (of at most 2 TPMI domains or at most 2 SRI domains) indicated by the first indication domain and the transport layer number indicated by the second indication domain, and further, based on the target transport layer number, interpret the target indication domain, and may obtain a determined precoding matrix, so as to ensure that the bit width of the target indication domain (for example, the second TPMI domain or the second SRI domain) corresponding to the SDM transmission mode is the same as the bit width of the target indication domain (for example, the second TPMI domain or the second SRI domain) corresponding to the TDM transmission mode.

If all layer combinations of 2 antenna panels are supported, table 18 gives a joint indication of SRS resource set indication and the sum of the transmission layers of at most 2 TPMI fields or at most 2 SRI fields.

TABLE 18

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Alternatively, similar to the above-described mode 1, a plurality of transmission layers may be indicated in combination to reduce the bit width of the first indication field.

In mode 3, the first indication field includes a first identifier, where the first identifier indicates whether the number of transmission layers corresponding to the target indication field is the same as the number of transmission layers corresponding to the second indication field, and the number of target transmission layers is equal to the number of transmission layers corresponding to the target indication field.

In the case that 1+3 or 3+1 combinations are not supported, in the SDM transmission scheme, only 1+1, 2+2, 1+2, and 2+1 combinations are supported, and in this case, the first indication field may include a first identifier, and whether the number of transmission layers corresponding to the target indication field and the number of transmission layers corresponding to the second indication field are the same is indicated by the first identifier.

The following tables 19 and 20 exemplify two possible indication methods. The table 19 cannot perform dynamic switching between the SDM transmission mode and the TDM transmission mode through the first indication field, and further needs to perform dynamic switching between the SDM transmission mode and the TDM transmission mode through other information fields (for example, the TDRA field (determined through indication of the number of repetitions, the same as the previous description, and not described in detail). The table 20 may dynamically switch between the SDM transmission mode and the TDM transmission mode according to the first indication.

TABLE 19

Table 20

For example, in the case where the terminal device determines that the number of transmission layers corresponding to the target indication field is different from the number of transmission layers corresponding to the second indication field, and in the case where the number of transmission layers corresponding to the second indication field is 1 (or 2), the terminal device may determine that the number of transmission layers corresponding to the target indication field is 2 (or 1).

For example, in the case where the terminal device determines that the number of transmission layers corresponding to the target indication domain is the same as the number of transmission layers corresponding to the second indication domain, and in the case where the number of transmission layers corresponding to the second indication domain is 1 (or 2), the terminal device may determine that the number of transmission layers corresponding to the target indication domain is also 1 (or 2), and further, the terminal device may determine the precoding matrix corresponding to the target indication domain according to the same target indication domain (second TPMI domain or second SRI domain) indication method as in the TDM transmission manner.

Mode 4, when the first indication domain is the antenna port indication domain, obtains the target number of transmission layers according to the first indication domain, including:

Optionally, according to the uplink DMRS indication method, the terminal device needs to determine the target transmission layer number according to the first TPMI domain or the first SRI domain, then determine the corresponding antenna port indication domain table according to the determined target transmission layer number (i.e. the rank number), and further determine the corresponding DMRS port.

Alternatively, a downlink DMRS indication method may be used to obtain the target number of transmission layers. For example, the antenna port indication domain may be made to indicate the total number of ports in PUSCH transmission, so that the terminal device may determine the total number of transmission layers in the SDM transmission mode according to the indicated number of ports, and further determine the number of transmission layers in the second TPMI domain or the second SRI domain according to the indication of the first TPMI domain or the first SRI domain. The target transport layer number is the transport layer number of the second TPMI domain or the second SRI domain. Accordingly, the indication method of the second TPMI domain or the second SRI domain in the Rel-17 TDM scheme may be used to indicate the precoding matrix corresponding to one data layer.

Mode 5, the target transport layer number is equal to the transport layer number indicated by the second indication field.

In the SDM transmission mode, the 2 antenna panels do not support a 4+x or x+4 correlation combination, where x is greater than 1, so the first TPMI domain or the first SRI domain does not need to indicate the precoding matrix related to layer 4. In the case that the combination of 3+1 and 1+3 is not supported, the first TPMI domain or the first SRI domain also need not indicate the precoding matrix associated with layer 3. The second indication field (e.g., the first TPMI field or the first SRI field) may be used to indicate the number of transport layers corresponding to the target indication field (e.g., the second TPMI field or the second SRI field).

Alternatively, similar to mode 1, the second indication field may be used to directly indicate the number of transmission layers corresponding to the target indication field, or the sum of the number of transmission layers corresponding to the 2 TPMI fields or the 2 SRI fields, or indicate whether the number of transmission layers corresponding to the 2 TPMI fields or the 2 SRI fields is the same.

The first TPMI field table 21 shows that in the case where 4 antenna ports, CP-OFDM waveform, maximum number of transmission layers is 2 or 3 or 4, and there is no configuration parameter ul-fullflowersransmission or the parameter is configured as fullflowermode 2 or fullflower.

Table 21

In the case of codebook subset=fullyand partialand dnoncoder, the first TPMI domain has 64 codepoints in total, where layer 1 and layer 2 occupy 50 codepoints in total, and if the number of transmission layers corresponding to the second TPMI domain or the second SRI domain is 1 or 2, at least 100 codepoints are needed to indicate the combination of the number of transmission layers and the precoding matrix corresponding to all 2 antenna panels. In the method of reducing the precoding matrix corresponding to the layer 1 and the layer 2, in the case of codebook subset=fullyand partialand coefficient, one possible indication method is as shown in the following table 22.

Since the number of precoding matrices corresponding to layer 1 and layer 2 is large and the number of precoding matrices corresponding to layer 3 and layer 4 and reserved code points is relatively small, layer combinations of 2 TPMI fields and precoding matrices of TPMI fields cannot be sufficiently indicated, and thus reduction of partial combinations can be considered. Table 22 shows a combination manner, where when the number of transmission layers corresponding to the first TPMI domain and the second TPMI domain is 1, the index of the precoding matrix of the TPMI domain is an even number; when the number of transmission layers corresponding to the first TPMI domain is 1 and the number of transmission layers corresponding to the second TPMI domain is 2, the index of the precoding matrix of the TPMI domain is an odd number; when the number of transmission layers corresponding to the first and second TPMI domains is 2, the index of the precoding matrix of the first TPMI domain is an odd number; and when the number of transmission layers corresponding to the first TPMI domain is 2 and the number of transmission layers corresponding to the second TPMI domain is 1, the index of the precoding matrix of the first TPMI domain is an even number. The number of layers and index of the precoding matrix may also be increased in the code points 50-63, increasing the number of combinations. In addition, the order of the different code points in the table may not be limited, and may be arbitrarily adjusted, for example.

In addition, when the number of transmission layers corresponding to the first TPMI domain and the second TPMI domain is 1, the index of the precoding matrix of the TPMI domain may be an odd number; when the number of transmission layers corresponding to the first TPMI domain is 1 and the number of transmission layers corresponding to the second TPMI domain is 2, the index of the precoding matrix of the TPMI domain is an even number; when the number of transmission layers corresponding to the first and second TPMI fields is 2, the index of the precoding matrix of the TPMI field is an even number; and when the number of transmission layers corresponding to the first TPMI domain is 2 and the number of transmission layers corresponding to the second TPMI domain is 1, the index of the precoding matrix of the first TPMI domain is an odd number.

Table 22

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The indication of the first SRI field is also similar, corresponding to a non-codebook (non-codebook) transmission, assuming lmax=2, as shown in table 23 below.

Table 23

Bit field mapping to index	SRI(s),N _SRS ＝4
		0	0
1	1
		2	2
3	3
		4	0,1
5	0,2
		6	0,3
7	1,2
		8	1,3
9	2,3
		10-15	Reservation

In the case where the first SRI field indicates the number of transport layers of the second SRI field, table 24 may be employed.

Table 24

In the case of adopting the method indicated in table 24, the SDM transmission mode and the TDM transmission mode cannot be distinguished by the first TPMI domain, and it is necessary to distinguish which transmission mode is adopted by means of the repetition number indication in the TDRA domain or other methods, and then interpret the first TPMI domain or the first SRI domain according to the interpretation mode in the corresponding transmission mode.

In mode 6, the number of target transmission layers is equal to the number of transmission layers indicated by the preset indication field.

Optionally, in the SDM transmission mode, a preset indication field (for example, a TRI field) is introduced, and the number of transmission layers of the target indication field is indicated (the values include 1, 2, 3 and 4); alternatively, the sum of transport layers indicating at most 2 TPMI fields or at most 2 SRI fields (the values include 1, 2, 3, 4); or indicates whether the number of transport layers corresponding to 2 TPMI fields or 2 SRI fields is the same. In this way, the terminal device may determine the number of transmission layers corresponding to the target indication domain (i.e., the target number of transmission layers) according to the TRI domain and the first TPMI domain (or the first SRI domain), and further decode the target indication domain to determine the precoding matrix corresponding to the target indication domain. This approach may ensure that the bit width of the target indication field in the SDM transmission approach is the same as the bit width of the target indication field in the TDM transmission approach.

Optionally, when the network side device indicates that the terminal device performs transmission based on the SDM transmission mode, the terminal device may dynamically switch to the TDM transmission mode through the repetition number indication in the TDRA domain, and when the terminal device determines that the target transmission mode is PUSCH repetition transmission based on TDM, the new information domain (e.g., the TRI domain) is not effective, that is, the terminal device ignores the TRI domain.

In mode 1, the terminal device may determine, through the first indication field, the number of transmission layers corresponding to the target indication field, and then interpret the target indication field according to a rule similar to the TDM transmission mode, that is, determine, based on the determined number of transmission layers, a precoding matrix under the number of layers.

In the present invention, the target indication domain is a second TPMI domain, or a second SRI domain; in the case that the target indication domain is the second TPMI domain, the second indication domain is the first TPMI domain; in the case where the target indication field is a second SRI field, the second indication field is the first SRI field.

In some embodiments, after obtaining the precoding matrix, the terminal device may further send, according to the precoding matrix, a physical uplink shared channel PUSCH scheduled by DCI according to an indication of a network side device or a target transmission manner.

Optionally, the SRS resource set indication in the DCI may be used to indicate a target transmission manner.

Optionally, the target transmission mode is any one of the following:

SDM transmission mode;

a TDM transmission scheme;

SFN transmission mode; or (b)

FDM transmission scheme.

Optionally, the target transmission mode is determined to be an SDM transmission mode when at least one of the following conditions is satisfied:

Optionally, the target transmission mode is determined to be a TDM transmission mode when at least one of the following conditions is satisfied:

Optionally, if the first preset value is 1, if the number of repetitions indicated by the TDRA field in the DCI is equal to 1, the target transmission mode is determined to be the SDM transmission mode, and if the number of repetitions indicated by the TDRA field in the DCI is greater than 1, the target transmission mode is determined to be the TDM transmission mode.

For example, in the application, when the number of repetitions indicated by the TDRA field in the received DCI is equal to 1, if PUSCH transmission is required, PUSCH transmission is performed according to the SDM transmission scheme, and when the number of repetitions indicated by the TDRA field in the received new DCI is greater than 1, PUSCH transmission is performed according to the TDM transmission scheme.

Optionally, the first preset code point set includes: 0. 1, 2 and 3, if the second preset code point set includes 4, 5, 6 and 7, determining that the target transmission mode is a TDM transmission mode if the code point corresponding to the first indication field is 4, and determining that the target transmission mode is an SDM transmission mode if the code point corresponding to the first indication field is 2.

For example, in the application, when the code point corresponding to the first indication field in the received DCI is 4, if PUSCH transmission is required, PUSCH transmission is performed according to the TDM transmission scheme, and when the code point corresponding to the first indication field in the new DCI is 2, PUSCH transmission is performed according to the SDM transmission scheme.

Optionally, in the case that the repetition number is 1 and the code point corresponding to the first indication field is 4, 5, 6, or 7, determining that the target transmission mode is the SDM transmission mode, in the case that the repetition number is greater than 1 and the code point corresponding to the first indication field is 0, 1, 2, or 3, determining that the target transmission mode is the TDM transmission mode,

For example, in the application, when the repetition number of the TDRA field instruction in the received DCI is equal to 1 and the code point corresponding to the first instruction field is 4, if PUSCH transmission is required, PUSCH transmission is performed according to the SDM transmission scheme, and when the repetition number of the TDRA field instruction in the received new DCI is greater than 1 and the code point corresponding to the first instruction field is 2, if PUSCH transmission is required, PUSCH transmission is performed according to the TDM transmission scheme.

Optionally, when the first indication field indicates the number of transmission layers corresponding to the target indication field, the target transmission mode is determined to be an SDM transmission mode, and when the first indication field indicates that the number of transmission layers corresponding to the target indication field is not included, the target transmission mode is determined to be a TDM transmission mode.

For example, in the application, when the first indication field indicates the number of transmission layers corresponding to the target indication field in the received DCI, if PUSCH transmission is required, PUSCH transmission is performed according to the SDM transmission scheme, and when the first indication field does not indicate the number of transmission layers corresponding to the target indication field in the received new DCI, PUSCH transmission is performed according to the TDM transmission scheme.

Optionally, if the number of transmission layers indicated by the second TPMI is the same as the number of transmission layers indicated by the first TPMI, determining that the target transmission mode is an SDM transmission mode when the target indication domain is the second TPMI and the second indication domain is the first TPMI; and otherwise, determining the target transmission mode as the TDM transmission mode.

For example, in the application, when the number of transmission layers indicated by the second TPMI and the number of transmission layers indicated by the first TPMI in the received DCI are the same, if PUSCH transmission is required, PUSCH transmission is performed according to the SDM transmission scheme, and when the number of transmission layers indicated by the second TPMI and the number of transmission layers indicated by the first TPMI in the received new DCI are different, if PUSCH transmission is required, PUSCH transmission is performed according to the TDM transmission scheme.

Optionally, the first indication information may be a transmission manner of a higher layer parameter configuration, such as schemedm; the second indication information may be SRS-resourceStoetToAddModList or SRS-resourceStoetToAddModListDCI-0-2 configured with two SRS resource sets.

In the invention, the target transmission mode is determined based on at least one condition, so that the terminal equipment can be switched between different transmission modes more easily.

The preset indication domain may be an indication domain independent of the SRS resource set indication domain, the first TPMI domain, and an indication domain other than the first SRI domain

the target indication domain is a second TPMI domain or a second SRI domain, M is less than or equal to K, N is less than 2 to the power of K, and correspondingly K is equal to the bit width of the indication domain where the first M bits or the first N code points are located.

Since the number of steps (rank) transmitted by each antenna panel may not exceed 2 layers in the SDM transmission mode, the bit width of the first TPMI domain may be smaller than the bit width in the TDM scheme, so the first TPMI domain does not need to indicate a precoding matrix with the rank number greater than 2, so the bit width of the TPMI domain (if set to K bits, the K power code points of 2) may also be set according to the number of precoding matrices indicated in the SDM transmission mode and the number of data layers, for example, in the case where the terminal device receives DCI to indicate that the terminal device performs transmission according to the TDM transmission mode, the first M bits of the first TPMI domain are valid (MSB, where M is the bit width of the TPMI domain in the Rel-17 TDM scheme), where M is less than or equal to K; or the first N code points of the first TPMI domain are validated (where N is the number of code points of the TPMI domain in the Rel-17 TDM scheme), where N is less than 2K times.

In some embodiments, the DCI further includes an antenna port indication field, and the terminal device may further determine a number of transmission layers included in a correlation list corresponding to the antenna port indication field.

Specifically, on the basis of the mode 1, the number of transmission layers included in the relevant list corresponding to the antenna port indication domain is based on the sum of the number of transmission layers indicated by the first TPMI domain and the number of transmission layers indicated by the SRS resource set indication domain in the DCI; or the sum of the transmission layer number indicated by the first SRI domain and the transmission layer number indicated by the SRS resource set indication domain in the DCI is obtained.

Specifically, on the basis of mode 2, the number of transmission layers included in the relevant list corresponding to the antenna port indication domain is based on the number of transmission layers indicated by the first TPMI domain in the DCI and the first identifier; or the transmission layer number indicated by the first SRI domain in the DCI and the first identifier are obtained.

Specifically, on the basis of mode 5, the number of transmission layers included in the relevant list corresponding to the antenna port indication domain is based on 1 transmission layer number or a plurality of transmission layer numbers indicated by the first TPMI domain in the DCI; or based on 1 or more transport layers indicated by the first SRI field in the DCI.

Specifically, on the basis of the mode 6, the number of transmission layers included in the relevant list corresponding to the antenna port indication domain is based on the sum of the number of transmission layers indicated by the first TPMI domain in the DCI and the number of transmission layers indicated by the preset indication domain; or based on the sum of the number of transmission layers indicated by the first SRI domain and the number of transmission layers indicated by the preset indication domain in the DCI.

And under the condition that the first indication domain is the target indication domain, designing a second TPMI domain or a second SRI domain in the SDM transmission mode, and ensuring that the bit width of the second TPMI domain or the second SRI domain in the SDM transmission mode is the same as that of the TDM scheme. In this manner, it is unnecessary to use other information fields to indicate the number of transmission layers corresponding to the second TPMI field or the second SRI field, and use the second TPMI field or the second SRI field to indicate both the number of transmission layers and the precoding matrix. Taking codebook subset=fullyand partialand encoding method as an example, assuming that the second TPMI field indicates only precoding matrices of layer 1 and layer 2, layer 1 and layer 2 may be jointly indicated, reducing part of the precoding matrices, as shown in table 25, where layer 1 corresponds to indexes where TPMI is even and layer 2 corresponds to indexes where TPMI is odd. Similarly, the index of the TPMI corresponding to layer 1 may be odd, and the index of the TPMI corresponding to layer 2 may be even; indexes of odd numbers of the corresponding TPMI of the layer 1 and the layer 2; layer 1 and layer 2 correspond to indexes where TPMI is even. When codebook subset=partialanddnoncoder or other values, or under other parameters, if the sum of the number of precoding matrices corresponding to layer 1 and layer 2 does not exceed the bit width under the TDM scheme, all precoding matrices may be indicated; if the sum of the number of precoding matrices corresponding to layer 1 and layer 2 exceeds the bit width in the TDM scheme, it is necessary to reduce the indication of the partial precoding matrix like table 25. SRI indication is similar, SRS resources under different layers in the second SRI domain are indicated jointly, if the bit width under the TDM scheme is exceeded, the combination of partial SRS resources can be reduced moderately, so that the SDM transmission mode and the TDM scheme are guaranteed to have the same bit width, and dynamic switching between different schemes is facilitated. For example, the transmission scheme is determined by the repetition number in the TDRA domain, and then the SRI domain or TPMI domain is interpreted according to the rule of each transmission scheme.

Table 25

In some embodiments, in order to enable the PUSCH transmission to be switched between different transmission modes, the bit width of the first SRI domain and/or the first TPMI domain and/or the second SRI domain and/or the second TPMI domain in the SDM transmission mode may also be different from the bit width of the first SRI domain/the second SRI domain and/or the first TPMI domain/the second TPMI domain in the TDM transmission mode in Rel-17.

In case of different bit widths, which is (in particular) a second TPMI field (or a second SRI field) in the SDM transmission scheme, the second TPMI field may indicate a precoding matrix of more than 1 layer, unlike the second TPMI field (or the second SRI field) in the TDM transmission scheme in Rel-17. Therefore, other information fields are not required to be used for indicating the number of transmission layers corresponding to the second TPMI field or the second SRI field, and the indication is more flexible. In order to support dynamic switching between the TDM transmission mode and the SDM transmission mode, the bit width of the first SRI field (or the first TPMI field) in the TDM transmission mode may be made the same as the bit width of the first SRI field (or the first TPMI field) in the SDM transmission mode.

For example, when the maximum transmission layer number is 2 or 3 or 4 for 4 antenna ports, CP-OFDM waveform, and the parameter ul-fullpowersransmission is not configured or is configured as fullpowerMode2 or fullpower, the second TPMI field in the Rel-17 TDM scheme is 5 bits when codebook subset=fullyand partialand dnoneparty, at most 32 precoding matrices are indicated. Since at least precoding matrices corresponding to the layer 1 and the layer 2 are required to be indicated in the SDM transmission mode, the second TPMI domain may be made to be 6 bits, so that all possible precoding matrices can be indicated, and possible indication methods are shown in table 26 and table 27.

Table 26 (up to 2 layers are supported, the bit widths corresponding to the three codebook subset configurations are 6,5,4 bits, respectively)

Table 27 (up to 3 layers, three codebook subset configurations corresponding to bit widths of 6,5,4 bits, respectively)

Similarly, the second SRI field may be indicated as shown in table 28 (corresponding to lmax=2) and table 29 (corresponding to lmax=3).

Table 28 (lmax=2, nsrs=2, 3, 4 bit widths are 1, 3, 4 bits, respectively)

Table 29 (Lmax=3, NSRS=2, 3, 4 bit widths are 2, 3, 4 bits, respectively)

In this embodiment, the transmission scheme may also be determined by the number of repetitions in the TDRA domain, and when the number of repetitions is 1 and the SRS resource set indicates that the domain is 2 or 3, SDM transmission is indicated; when the number of repetitions indicated in the TDRA field is greater than 1 and the SRS resource set indicates a field of 2 or 3, TDM transmission is indicated.

When TDM transmission is performed, the terminal device determines that the bit width of the second TPMI domain or the second SRI domain is the same as the SDM transmission mode, but only the first M bits (MSBs) are valid, where M is the bit width of the second TPMI domain or the second SRI domain in Rel-17 TDM scheme, and the first M bits are interpreted according to the second TPMI domain or the second SRI domain in Rel-17; or only the first N code points are valid, the first N code points being determined according to the second TPMI domain or the second SRI domain in the TDM scheme. The terminal device does not expect the network side device to indicate a code point other than the first N code points for it.

In some embodiments, the method further includes (when the network side device configures the terminal to perform transmission in the target transmission mode) when the target transmission mode is one of the SDM transmission mode, the SFN transmission mode, or the FDM transmission mode:

Wherein the bit width of the target indication field is any one of the following:

a total bit width of the first SRI domain and the second SRI domain in the DCI;

When the bit width of the target indication field is the total bit width of the first TPMI field and the second TPMI field in the DCI, the target indication field occupies the bit positions of the first TPMI field and the second TPMI field at the time of SDM transmission. I.e. when the network side instructs the terminal to perform single TRP or single panel transmission, the terminal determines that the first TPMI domain and the second TPMI domain are combined into one information domain.

In the case that the bit width of the target indication field is the sum of the bit width of the first TPMI field and the preset bit width in the DCI, the target indication field occupies the bit positions of the first TPMI field and part of the second TPMI field at the time of SDM transmission in the DCI. When the network side instructs the terminal to perform single TRP or single panel transmission, the location of the target indication domain may not be limited to the location of the first TPMI domain or the location of the second TPMI domain at the time of SDM transmission, but may be more flexible. Thus, even if the width of the target indication domain is large in single TRP or single panel transmission, the target indication domain can be determined by the method, and the signaling overhead is reduced. For example, the first TPMI field is 5 bits, the second TPMI field is 5 bits, and the target information field is 6 bits. In the prior art, in order to support single TRP or single panel transmission and dynamic switching between SDM scheme and single TRP or single panel transmission, it is necessary to ensure that the bit width of each information domain is the same, and since the bit width of the target information domain is larger than that of the first TPMI domain and the second TPMI domain, the first TPMI domain and the second TPMI domain are required to be 6 bits no matter the target information domain uses the first TPMI domain or the second TPMI domain. According to the method of the invention, the bit widths of the first or second TPMI domain and the target indication domain are not required to be equal, but only the interpretation mode of the target indication domain is changed, so that the overall cost of DCI signaling is reduced.

In some embodiments, when the DCI indicates that the terminal performs the srp or single-packet transmission, for example, only one SRS resource set is used for transmission, or only a single TCI state is used for transmission, if the target transmission mode is any one of the SDM transmission mode, the SFN transmission mode, or the FDM transmission mode, the target indication domain is at least any one of a preset information domain, a first SRI domain, a second SRI domain, a first TPMI domain, or a second TPMI domain, and the determining, according to the DCI, the precoding matrix corresponding to the target indication domain includes any one of the following:

wherein M and N are integers greater than or equal to 1, respectively.

The preset information fields may include 2 TPMI fields, and/or 2 SRI fields.

For example, when determining the precoding matrix corresponding to the target indication field based on the first M bits of the target indication field, when the target indication field includes the first TPMI field and the second TPMI field, if it is determined that the bit width of the first TPMI field is A1 and the bit width of the second TPMI field is A2, the following a1+a2-M bits in the TPMI field are ignored.

For example, when determining the precoding matrix corresponding to the target indication field based on the first M bits of the target indication field, when the target indication field includes the first TPMI field and the second TPMI field, if it is determined that the bit width of the first TPMI field is A1 and the bit width of the second TPMI field is A2, the first a1+a2-M bits in the TPMI field are ignored.

For example, in the case that the first N code points of the target indication field determine the precoding matrix corresponding to the target indication field,in the case where the target indication field includes a first TPMI field and a second TPMI field, a post (2 ^A1+A2 -N) code points ignore or reserve.

For example, when the precoding matrix corresponding to the target indication field is determined based on the target indication field, when the target indication field is a TPMI field, the precoding matrix corresponding to the target indication field is determined based on the TPMI field corresponding to the maximum bit width. For example, in case that a bit width A1 of the first TPMI domain is greater than a bit width A2 of the second TPMI domain, determining a precoding matrix based on the first TPMI domain; in case that the bit width A1 of the first TPMI domain is smaller than the bit width A2 of the second TPMI domain, a precoding matrix is determined based on the second TPMI domain.

For example, when determining a precoding matrix corresponding to the target indication domain based on the target indication domain, when the target indication domain is a TPMI domain, the precoding matrix is determined based on the first TPMI domain and the second TPMI domain.

In some embodiments, the methods provided herein further comprise at least one of:

Optionally, when switching to single-path transmission (for example, a SRS resource set indicator field indicates '0' or '1', or other information fields indicates that the terminal performs single TCI transmission, etc.), the UE determines that one target transmission layer is maxrank+maxrank2, where maxRank and maxRank2 are the maximum layers corresponding to 2 SRS resources set, or the maximum layers corresponding to 2 TPMI fields.

Alternatively, in the case where the first maximum transmission layer is Lmax and the second maximum transmission layer is Lmax2, when switching to single packet l transmission, the terminal determines that one target transmission layer number (i.e., the maximum layer number transmitted at this time) is lmax+lmax2. Wherein Lmax and Lmax2 are the maximum number of layers corresponding to each of the 2 SRI domains. Alternatively, the configuration of Lmax and Lmax2 is similar to the prior art. For example, 2 parameters (maxMIMO-relays) are reported by the UE to obtain Lmax and Lmax2; or configuring 2 parameters (maxMIMO-relays) through gNB to obtain Lmax and Lmax2.

According to the above method, the terminal can determine the corresponding maximum number of transmission layers when switching from the SDM transmission mode to single TRP or single panel transmission.

Optionally, in the case that the network side device configures the third maximum transmission layer number (i.e. 1 maximum layer number related parameter, for example, maxRank or Lmax) for the terminal, the maximum layer number indicating PUSCH transmission is the third maximum transmission layer number; when switching to single-panel transmission (e.g., a '0' or '1' is indicated by SRS resource set indicator field, or transmission is performed using a single SRS resource set, or other information field indicates that the UE performs a single TCI transmission, etc.), the UE determines the maximum number of transmission layers at this time to be the third maximum number of transmission layers. According to the method, the terminal can determine the maximum layer number of the precoding code word corresponding to each panel when SDM transmission is carried out. In addition, only the third maximum transmission layer number (i.e. 1 maximum layer number related parameter) is configured, which is favorable for the same configuration method of each transmission scheme, is convenient for dynamic switching among schemes, and does not need to change the meaning of the maximum layer number, for example, the maximum layer number always represents the maximum transmission layer number or the total data layer number in transmission.

the two target transmission layers comprise the respective maximum layers of two third indication domains in the DCI, wherein the third indication domains are TPMI domains or SRI domains; wherein the TPMI domain comprises a first TPMI domain and/or a second TPMI domain, also comprising a TPMI domain in Rel-15, and the SRI domain comprises a first SRI and/or a second SRI domain, also comprising an SRI domain in Rel-15;

the maximum number of layers of each of the two third indication fields (for example, when transmission in the SDM transmission scheme is performed) is any one of:

The second preset value is a value configured by the network side equipment for the terminal.

Optionally, the first integer is equal toThe second integer is equal to->Wherein (1)>For the rounding-up operation, a represents the third maximum number of transmission layers. Examples 1-5 are described below.

Example 1, first integer equals the maximum number of layers of the first TPMI domain or the first SRI domainThe second integer is equal to the maximum number of layers of the second TPMI domain or the second SRI domain +.>

Example 2, the first integer is equal to the maximum number of layers of the TPMI domain or the SRI domain corresponding to the first SRS resource set, and the second integer is equal to the maximum number of layers of the TPMI domain or the SRI domain corresponding to the second SRS resource set.

Example 3 one S in two SRS resource setsWhen the maximum port number of the SRS resource in the RS resource set is greater than the maximum port number of the SRS resource in another SRS resource set, the first integer is the maximum layer number of the TPMI domain or the SRI domain corresponding to the one SRS resource setThe second integer is the maximum layer number of the TPMI domain or SRI domain corresponding to the another SRS resource set>

For example, if the number of ports of SRS resources in SRS resource set ID for codebook (codebook) -based PUSCH transmission is {4,2}, the number of ports of SRS resources in SRS resource set ID 4 is {2,2}, the third maximum transmission layer number a=3, and the maximum layer number of TPMI domain or SRI domain corresponding to SRS resource set ID 2 is 2 SRS resource set ID the maximum layer number of the TPMI domain or SRI domain corresponding to the SRS resource set ID is 1At this time, it can be ensured that more streams are transmitted by using the panel with more SRS resource ports.

Example 4, in the case where the minimum port number of the SRS resource in one SRS resource set is greater than the minimum port number of the SRS resource in another SRS resource set, the first integer is equal to the maximum number of layers of the TPMI domain or the SRI domain corresponding to the one SRS resource setThe second integer is equal to the maximum layer number of the TPMI domain or SRI domain corresponding to the other SRS resource set +.>

For example, the port number of SRS resources in SRS resource set ID for codebook-based PUSCH transmission is {4,4}, SRS resThe number of ports of SRS resources in the resource set ID 4 is {2,4}, and the maximum number of layers of the TPMI domain or the SRI domain corresponding to the third maximum transmission layer number a= 3,SRS resource set ID 2 is 2SRS resource set ID the maximum layer number of the TPMI domain or SRI domain corresponding to SRS resource set ID isAt this time, it can be ensured that more streams are transmitted by using the panel with more SRS resource ports.

In example 3 and example 4, when the maximum port number or the minimum port number of the SRS resources corresponding to the 2 SRS resource sets are equal, the maximum number of layers corresponding to the TPMI domain or the SRI domain or the SRS resource set may be determined according to the method shown in example 1 or example 2.

Example 5, in the case where the number of SRS resources in one SRS resource set is greater than the number of SRS resources in another SRS resource set, the first integer is equal to the maximum number of layers of the TPMI domain or SRI domain corresponding to the one SRS resource setThe second integer is equal to the maximum layer number of the TPMI domain or SRI domain corresponding to the other SRS resource setWhen the number of SRS resources corresponding to the 2 SRS resource sets is equal, the maximum number of layers corresponding to the TPMI domain, the SRI domain, or the SRS resource set may be determined according to the method shown in example 1 or example 2.

Optionally, in the case where the third maximum number of transmission layers a configured by the network side device is greater than the second preset value B (for example, b=2), it is determined that the respective maximum number of layers of the two third indication fields (2 TPMI fields or 2 SRI fields) is 2.

In the case that the third maximum number of transmission layers is less than or equal to the second preset value, the third integer is, for exampleThe fourth integer is, for example->Wherein (1)>Is a rounding down operation. Examples 6-10 are described below.

Example 6, third integer equal to the maximum number of layers corresponding to the first TPMI domain or the first SRI domainThe fourth integer is equal to the maximum number of layers of the second TPMI domain or the second SRI domain is +.>

Example 7, the third integer being equal to the maximum number of layers of the TPMI domain or SRI domain corresponding to the first SRS resource set is The maximum layer number of the TPMI domain or SRI domain corresponding to the fourth integer equal to the second SRS resource set is

Example 8, in the case where the maximum number of ports of the SRS resource in one SRS resource set is smaller than the maximum number of ports of the SRS resource in another SRS resource set, the third integer is equal to the maximum number of layers of the TPMI domain or the SRI domain corresponding to the one SRS resource setThe fourth integer is equal to the maximum layer number of the TPMI domain or SRI domain corresponding to the other SRS resource set +.>

For example, in use forWhen the number of ports of SRS resources in SRS resource set ID of PUSCH transmission based on codebook is {4,2}, the number of ports of SRS resources in SRS resource set ID 4 is {2,2}, and the third maximum transmission layer number a=3, the maximum layer number of TPMI domain or SRI domain corresponding to SRS resource set ID 4 is 1SRS resource set ID 2 the maximum layer number of the corresponding TPMI domain or SRI domain is 2 +.>At this time, the terminal can be ensured to transmit more streams by adopting the panel with more SRS resource ports.

Example 9, in the case where the minimum port number of the SRS resource in one SRS resource set is smaller than the minimum port number of the SRS resource in another SRS resource set, the third integer is equal to the maximum number of layers of the TPMI domain or the SRI domain corresponding to the SRS resource set The fourth integer is equal to the maximum layer number of the TPMI domain or SRI domain corresponding to the other SRS resource set +.>

For example, in the case where the port number of SRS resources in SRS resource set ID for codebook-based PUSCH transmission is {4,4}, the port number of SRS resources in SRS resource set ID is {2,4}, and the third maximum transmission layer number a=3, the maximum layer number of TPMI domain or SRI domain corresponding to SRS resource set ID 4 is 1SRS resource set ID 2 the maximum layer number of the corresponding TPMI domain or SRI domain is 2 +.>At this time, the terminal can also be ensured to transmit more streams by adopting the panel with more SRS resource ports.

In examples 8 and 9, when the maximum number of ports or the minimum number of ports of the SRS resources corresponding to the 2 SRS resource sets are equal, the maximum number of layers corresponding to the TPMI domain or the SRI domain or the SRS resource set may be determined according to the method shown in example 6 or example 7.

Example 10, in the case where the number of SRS resources in one SRS resource set is smaller than the number of SRS resources in another SRS resource set, the third integer is equal to the maximum number of layers of the TPMI domain or the SRI domain corresponding to the SRS resource setThe fourth integer is equal to the maximum layer number of the TPMI domain or SRI domain corresponding to the other SRS resource set When the number of SRS resources corresponding to the 2 SRS resource sets is equal, the maximum number of layers corresponding to the TPMI domain, the SRI domain, or the SRS resource set may be determined according to the method shown in example 6 or example 7.

Optionally, if the third maximum number of transmission layers a configured by the network side device for the terminal is greater than the second preset value B (for example, b=2), the UE determines that the maximum number of layers of each of the two third indication domains (2 TPMI domains or 2 SRI domains) is 2 respectively.

In some embodiments, the two target transmission layers are determined according to the third maximum transmission layer number and a higher layer parameter related to another layer number configured by the network side device for the terminal.

For example, the higher layer parameter is max_layer_packet, the max_layer_packet is used to indicate the maximum layer number of the precoding matrix corresponding to the first SRI domain, or the first TPMI domain, or the first SRS resource set, and the terminal determines, according to the max_layer_packet and the third maximum transmission layer number maxRank (or Lmax), that the maximum layer number of the precoding matrix corresponding to the second SRI domain, or the second TPMI domain, or the second SRS resource set is maxRank-max_layer (or Lmax-max_layer_packet). Here, the two target transport layers include maxRank (or Lmax) or maxRank-max_layer_panel (or Lmax-max_layer_panel).

Specifically, when the network side device instructs the terminal to transmit the SDM transmission mode, for example, the higher layer parameter ul-fullflowertransmission=fullflowemode 1, or the 2 higher layer parameters ul-fullflowertransmission and ul-fullflowertransmission 2 are configured as fullowemode 1, and when the higher layer parameter codebooksubset=partialdnoncomponent, or the 2 higher layer parameters codebookSubset and codebookSubset2 are configured as partialdnoncomponent, the terminal UE determines that the bit widths of the first TPMI domain and the second TPMI domain are both 5 bits based on the following table 30.

Table 30

Bit field mapped to index	codebookSubset＝partialAndNonCoherent
		0	1layer:TPMI＝0
1	1layer:TPMI＝1
		…	…
3	1layer:TPMI＝3
		4	2layers:TPMI＝0
…	…
		9	2layers:TPMI＝5
10	1layer:TPMI＝13
		11	2layer:TPMI＝6
12	1layer:TPMI＝4
		…	…
20	1layer:TPMI＝12
		21	1layer:TPMI＝14
22	1layer:TPMI＝15
		23	2layers:TPMI＝7
…	…
		29	2layers:TPMI＝13
30-31	Reserved

In the case that the network side device instructs the terminal to perform single SRS resource set or single TCI state related transmission through SRS resource set indicator fields or other information fields in the DCI (for example, SRS resource set indicator fields indicate '0' or '1', or other information fields indicate that the UE performs single TCI transmission, etc.), in order to ensure that DCI signaling overhead is unchanged during dynamic handover, the terminal interprets the target indication fields (up to 10 bits, i.e., the sum of the bit widths of the first TPMI field and the second TPMI field) according to any one of the following methods, to obtain the precoding matrix.

For example, based on codebook subset=partialandnetwork entity in table 31, in order to support up to 4 layers of transmission, it may be determined that the bit width of the target indication field (which may be the TPMI field, or the first TPMI field) is at least 6 bits, i.e. the precoding codeword is determined according to 6 bits. At this time, the terminal can determine that the target indication domain is a TPMI domain, and the bit width is 10 bits, wherein 6 bits are subjected to precoding indication, and 4 bits are reserved; or the terminal determines that the target indication domain is a TPMI domain, the bit width is 6 bits, and other information domains (such as reserved information domains) occupy 4 bits; or the terminal determines that the target indication domain is a first TPMI domain, the first TPMI domain is 6 bits, the second TPMI domain is 4 bits, and the terminal determines a precoding codeword according to the first TPMI domain, and the second TPMI domain is reserved.

Table 31 (4 antenna port precoding information and layer number if transform precoding is not turned on, maxrank=3 or 4,ul FullPowerTransmission =fullpower 1)

In some embodiments, the determining, according to the DCI, a precoding matrix corresponding to the target indication field includes:

wherein the second transmission mode is an SDM transmission mode;

wherein the first set of targets is any one of:

an SRS resource set associated with the first transmission mode;

a preset set associated with the first transmission mode; or (b)

SRS resource set included in configuration grant sent by network equipment

A set of first target set index indications included in configuration authorization sent by network side equipment;

a first target set index;

wherein the second set of targets is any one of:

the last M SRS resource sets of the plurality of SRS resource sets;

an SRS resource set associated with the second transmission mode;

a preset set associated with the second transmission mode; or (b)

SRS resource set included in configuration authorization sent by network side equipment;

A set of index indications of a second target set, which is included in configuration authorization sent by the network side equipment;

m is an integer greater than or equal to 1.

Optionally, each SRS resource set configured by the network side device has a corresponding ID (or set index), and the front-back arrangement order of the SRS resource sets may be determined according to the order of the IDs (or set indexes) from small to large, so that the first M SRS resource sets or the last M SRS resource sets are determined based on the ordered SRS resource sets.

For example, when the network-side device is configured with 4 SRS resources (user) of 'codebook' or 'non-codebook', the first 2 SRS resources are determined as the first set and the second 2 SRS resources are determined as the second set after the front-back arrangement order of the SRS resource sets is determined from small to large according to the ID (or set index).

Alternatively, the preset set may be an SRS resource set.

Optionally, when performing SRS resource set indicator domain indication, TPMI domain, and SRI domain interpretation, the first SRS resource set and the second SRS resource set are, for example, a lower-index SRS resource set and a higher-index SRS resource set in the SRS resource set corresponding to the transmission mode, respectively

Fig. 2 is a schematic structural diagram of a device for determining a precoding matrix according to the present invention. As shown in fig. 2, the apparatus includes:

a receiving module 210, configured to receive downlink control information DCI; the DCI includes a target indication field;

a determining module 220, configured to determine, according to the DCI, a precoding matrix corresponding to the target indication domain; the precoding matrix is used for transmitting a physical uplink shared channel PUSCH scheduled by the DCI.

In some embodiments, the DCI further includes a first indication field; the determining module 220 is specifically configured to:

In some embodiments, in the case that the first indication field is an antenna port indication field, the determining module 220 is specifically configured to:

In some embodiments, further comprising:

The sending module 230 is configured to send, according to the precoding matrix and according to an indication of the network side device or a target transmission mode, a physical uplink shared channel PUSCH scheduled by DCI.

In some embodiments, the target transmission mode is any one of the following:

a space division multiplexing SDM transmission mode;

a time division multiplexing TDM transmission mode;

a single frequency network SFN transmission mode; or (b)

Frequency division multiplexing FDM transmission scheme.

In some embodiments, in the case where the target transmission mode is a TDM transmission mode, the determining module 220 is specifically configured to:

In some embodiments, the DCI further includes an antenna port indication field, and the determining module 220 is further configured to:

a total bit width of the first SRI domain and the second SRI domain in the DCI;

wherein M and N are integers greater than or equal to 1, respectively.

In some embodiments, the determining module is further to:

In some embodiments, the determining module is specifically configured to:

wherein the second transmission mode is an SDM transmission mode;

wherein the first set of targets is any one of:

An SRS resource set associated with the first transmission mode;

a preset set associated with the first transmission mode; or (b)

wherein the second set of targets is any one of:

the last M SRS resource sets of the plurality of SRS resource sets;

an SRS resource set associated with the second transmission mode;

a preset set associated with the second transmission mode; or (b)

m is an integer greater than or equal to 1.

Fig. 3 is a schematic entity structure of a terminal device provided by the present invention. As shown in fig. 3, the electronic device may include: processor 310, communication interface (Communications Interface) 320, memory 330 and communication bus 340, wherein processor 310, communication interface 320, memory 330 accomplish communication with each other through communication bus 340. The processor 310 may invoke logic instructions in the memory 330 to perform a method of determining a precoding matrix, the method comprising: receiving downlink control information DCI; the DCI includes a target indication field; determining a precoding matrix corresponding to the target indication domain according to the DCI; the precoding matrix is used for transmitting a physical uplink shared channel PUSCH scheduled by the DCI.

In some embodiments, the processor is further to:

In some embodiments, the target transmission mode is any one of the following:

a space division multiplexing SDM transmission mode;

a time division multiplexing TDM transmission mode;

A single frequency network SFN transmission mode; or (b)

Frequency division multiplexing FDM transmission scheme.

A total bit width of the first SRI domain and the second SRI domain in the DCI;

wherein M and N are integers greater than or equal to 1, respectively.

In some embodiments, the processor is specifically configured to:

wherein the second transmission mode is an SDM transmission mode;

wherein the first set of targets is any one of:

an SRS resource set associated with the first transmission mode;

a preset set associated with the first transmission mode; or (b)

Wherein the second set of targets is any one of:

the last M SRS resource sets of the plurality of SRS resource sets;

an SRS resource set associated with the second transmission mode;

a preset set associated with the second transmission mode; or (b)

m is an integer greater than or equal to 1.

Further, the logic instructions in the memory 330 described above may be implemented in the form of software functional units and may be stored in a computer-readable storage medium when sold or used as a stand-alone product. Based on this understanding, the technical solution of the present invention may be embodied essentially or in a part contributing to the prior art or in a part of the technical solution in the form of a software product stored in a storage medium, comprising several instructions for causing a computer device (which may be a personal computer, a server, a network device, etc.) to perform all or part of the steps of the method of the embodiments of the present invention. And the aforementioned storage medium includes: a U-disk, a removable hard disk, a Read-Only Memory (ROM), a random access Memory (Random Access Memory, RAM), a magnetic disk, or an optical disk, or other various media capable of storing program codes.

The processor-readable storage medium may be any available medium or data storage device that can be accessed by a processor including, but not limited to, magnetic memory (e.g., floppy disk, hard disk, tape, magneto-optical disk (MO), etc.), optical memory (e.g., CD, DVD, BD, HVD, etc.), and semiconductor memory (e.g., ROM, EPROM, EEPROM, nonvolatile memory (NAND FLASH), solid State Disk (SSD)), etc.

In another aspect, the present invention also provides a computer program product, where the computer program product includes a computer program, where the computer program can be stored on a non-transitory computer readable storage medium, and when the computer program is executed by a processor, the computer is capable of executing a method for determining a precoding matrix provided by the above methods, where the method includes: receiving downlink control information DCI; the DCI includes a target indication field; determining a precoding matrix corresponding to the target indication domain according to the DCI; the precoding matrix is used for transmitting a physical uplink shared channel PUSCH scheduled by the DCI.

In yet another aspect, the present invention also provides a non-transitory computer readable storage medium having stored thereon a computer program which, when executed by a processor, is implemented to perform a method of determining a precoding matrix provided by the above methods, the method comprising: receiving downlink control information DCI; the DCI includes a target indication field; determining a precoding matrix corresponding to the target indication domain according to the DCI; the precoding matrix is used for transmitting a physical uplink shared channel PUSCH scheduled by the DCI.

The technical scheme provided by the invention can be suitable for various systems, in particular to a 5G system. For example, suitable systems may be global system for mobile communications (global system of mobile communication, GSM), code division multiple access (code division multiple access, CDMA), wideband code division multiple access (Wideband Code Division Multiple Access, WCDMA) universal packet Radio service (general packet Radio service, GPRS), long term evolution (long term evolution, LTE), LTE frequency division duplex (frequency division duplex, FDD), LTE time division duplex (time division duplex, TDD), long term evolution-advanced (long term evolution advanced, LTE-a), universal mobile system (universal mobile telecommunication system, UMTS), worldwide interoperability for microwave access (worldwide interoperability for microwave access, wiMAX), 5G New air interface (New Radio, NR), and the like. Terminal devices and network devices are included in these various systems. Core network parts such as evolved packet system (Evloved Packet System, EPS), 5G system (5 GS) etc. may also be included in the system.

The terminal device according to the embodiments of the present application may be a device that provides voice and/or data connectivity to a user, a handheld device with a wireless connection function, or other processing device connected to a wireless modem, etc. The names of the terminal devices may also be different in different systems, for example in a 5G system, the terminal devices may be referred to as User Equipment (UE). The wireless terminal device may communicate with one or more Core Networks (CNs) via a radio access Network (Radio Access Network, RAN), which may be mobile terminal devices such as mobile phones (or "cellular" phones) and computers with mobile terminal devices, e.g., portable, pocket, hand-held, computer-built-in or vehicle-mounted mobile devices that exchange voice and/or data with the radio access Network. Such as personal communication services (Personal Communication Service, PCS) phones, cordless phones, session initiation protocol (Session Initiated Protocol, SIP) phones, wireless local loop (Wireless Local Loop, WLL) stations, personal digital assistants (Personal Digital Assistant, PDAs), and the like. The wireless terminal device may also be referred to as a system, subscriber unit (subscriber unit), subscriber station (subscriber station), mobile station (mobile), remote station (remote station), access point (access point), remote terminal device (remote terminal), access terminal device (access terminal), user terminal device (user terminal), user agent (user agent), user equipment (user device), and the embodiments of the present application are not limited.

It will be appreciated by those skilled in the art that embodiments of the present application may be provided as a method, system, or computer program product. Accordingly, the present application may take the form of an entirely hardware embodiment, an entirely software embodiment, or an embodiment combining software and hardware aspects. Furthermore, the present application may take the form of a computer program product embodied on one or more computer-usable storage media (including, but not limited to, magnetic disk storage, optical storage, and the like) having computer-usable program code embodied therein.

The present application is described with reference to flowchart illustrations and/or block diagrams of methods, apparatus (systems) and computer program products according to embodiments of the application. It will be understood that each flow and/or block of the flowchart illustrations and/or block diagrams, and combinations of flows and/or blocks in the flowchart illustrations and/or block diagrams, can be implemented by computer-executable instructions. These computer-executable instructions may be provided to a processor of a general purpose computer, special purpose computer, embedded processor, or other programmable data processing apparatus to produce a machine, such that the instructions, which execute via the processor of the computer or other programmable data processing apparatus, create means for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.

These processor-executable instructions may also be stored in a processor-readable memory that can direct a computer or other programmable data processing apparatus to function in a particular manner, such that the instructions stored in the processor-readable memory produce an article of manufacture including instruction means which implement the function specified in the flowchart flow or flows and/or block diagram block or blocks.

These processor-executable instructions may also be loaded onto a computer or other programmable data processing apparatus to cause a series of operational steps to be performed on the computer or other programmable apparatus to produce a computer implemented process such that the instructions which execute on the computer or other programmable apparatus provide steps for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.

It will be apparent to those skilled in the art that various modifications and variations can be made in the present application without departing from the spirit or scope of the application. Thus, if such modifications and variations of the present application fall within the scope of the claims and the equivalents thereof, the present application is intended to cover such modifications and variations.

Claims

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

determining a precoding matrix corresponding to the target indication domain according to the DCI; the precoding matrix is used for sending the Physical Uplink Shared Channel (PUSCH) scheduled by the DCI.

2. The method of claim 1, wherein the DCI further comprises a first indication field; the determining, according to the DCI, a precoding matrix corresponding to the target indication domain includes:

3. The method of claim 2, wherein the first indication field comprises a target transport layer number indication;

the target transmission layer number is the transmission layer number indicated by the target transmission layer number indication.

4. The method of claim 3, wherein the first indication field further comprises a channel sounding reference signal, SRS, resource set indication corresponding to the target transmission layer number indication;

the target number of transmission layers indicates that the number of indicated transmission layers is 0, or 1, or more, or reserved.

5. The method of claim 2, wherein the first indication field comprises a sum of a number of transport layers corresponding to the target indication field and a number of transport layers corresponding to a second indication field;

the target transmission layer number is equal to the difference between the transmission layer number indicated by the first indication domain and the transmission layer number indicated by the second indication domain.

6. The method of claim 2, wherein the first indication field includes a first flag indicating whether a number of transport layers corresponding to the target indication field and a number of transport layers corresponding to a second indication field are the same, and the target number of transport layers is equal to the number of transport layers corresponding to the target indication field.

7. The method according to claim 2, wherein, in the case where the first indication field is an antenna port indication field, the obtaining the target number of transmission layers according to the first indication field includes:

8. The method of claim 2, wherein the target number of transport layers is equal to the number of transport layers indicated by the second indication field.

9. The method according to any of claims 5 to 8, wherein the target indication field is a second transmission precoding indication TPMI field or a second sounding reference signal resource indication SRI field;

in the case that the target indication domain is a second TPMI domain, the second indication domain is a first TPMI domain; in the case that the target indication domain is a second SRI domain, the second indication domain is a first SRI domain.

10. The method according to claim 1, wherein the method further comprises:

and according to the precoding matrix and according to the indication or target transmission mode of the network side equipment, sending the Physical Uplink Shared Channel (PUSCH) scheduled by the DCI.

11. The method of claim 10, wherein a sounding reference signal, SRS, resource set indication in the DCI is used to indicate the target transmission mode.

12. The method of claim 11, wherein the target transmission mode is any one of the following:

a space division multiplexing SDM transmission mode;

a time division multiplexing TDM transmission mode;

a single frequency network SFN transmission mode; or (b)

Frequency division multiplexing FDM transmission scheme.

13. The method of claim 12, wherein the target transmission mode is determined to be the SDM transmission mode when at least one of:

the first indication domain indicates a target transmission layer number corresponding to the target indication domain;

And receiving first indication information, wherein the first indication information indicates that the target transmission mode is the SDM transmission mode.

14. The method of claim 12, wherein the targeted transmission mode is determined to be the TDM transmission mode when at least one of:

And receiving second indication information, wherein the second indication information indicates that the target transmission mode is the TDM transmission mode.

15. The method of any one of claims 2 to 6 or 13 or 14, wherein the first indication field is an SRS resource set indication field, or a preset indication field, or a first TPMI field, or a first SRI field in the DCI.

16. The method of claim 10, wherein, in the case where the target transmission mode is a TDM transmission mode, the determining, according to the DCI, a precoding matrix corresponding to the target indication field includes:

determining a precoding matrix corresponding to the target indication domain according to first M bits or first N code points of any one domain of a second TPMI domain, a first TPMI domain, a second SRI domain and a first SRI domain in the DCI;

the target indication field is any one of the following: the first TPMI domain, the second TPMI domain, the first SRI domain, or the second SRI domain;

m is less than or equal to K, N is less than 2 to the power of K, and K is equal to the bit width of the indication domain where the first M bits or the first N code points are located.

17. The method of claim 1, wherein the DCI further includes an antenna port indication field therein, the method further comprising:

and determining the number of transmission layers included in a correlation list corresponding to the antenna port indication domain.

18. The method of claim 17, wherein the number of transmission layers included in the correlation list corresponding to the antenna port indication field is determined based on any one of:

the transmission layer number indicated by the first SRI domain in the DCI and a first identifier;

the sum of the transmission layer number indicated by the first TPMI domain and the transmission layer number indicated by the preset indication domain in the DCI;

the sum of the number of transmission layers indicated by a first SRI domain and the number of transmission layers indicated by a preset indication domain in the DCI;

1 transmission layer number or a plurality of transmission layer numbers indicated by a first TPMI domain in the DCI;

determining 1 or more transmission layers indicated by a first SRI domain in the DCI;

And the sum of the transmission layer number indicated by the first SRI domain and the transmission layer number indicated by the second SRI domain in the DCI.

19. The method of claim 10, wherein in the case where the target transmission mode is one of an SDM transmission mode, an SFN transmission mode, or an FDM transmission mode, the method further comprises:

20. The method of claim 19, wherein the bit width of the target indication field is any one of:

a total bit width of the first SRI domain and the second SRI domain in the DCI;

21. The method of claim 10, wherein, in a case where the target transmission mode is any one of an SDM transmission mode, an SFN transmission mode, or an FDM transmission mode, and the target indication domain is at least any one of a preset information domain, a first SRI domain, a second SRI domain, a first TPMI domain, or a second TPMI domain, the determining, according to the DCI, a precoding matrix corresponding to the target indication domain includes any one of:

wherein M and N are integers greater than or equal to 1, respectively.

22. The method of claim 19, further comprising at least one of:

23. The method of claim 22, wherein a sum of the two target transport layers is equal to the third maximum transport layer number;

24. The method of claim 1, wherein the determining, according to the DCI, a precoding matrix corresponding to the target indication field comprises:

25. The method of claim 1, wherein the determining, according to the DCI, a precoding matrix corresponding to the target indication field comprises:

wherein the second transmission mode is an SDM transmission mode;

wherein the first set of targets is any one of:

an SRS resource set associated with the first transmission mode;

A preset set associated with the first transmission mode; or (b)

wherein the second set of targets is any one of:

the last M SRS resource sets of the plurality of SRS resource sets;

an SRS resource set associated with the second transmission mode;

a preset set associated with the second transmission mode; or (b)

m is an integer greater than or equal to 1.

26. A terminal device, comprising: memory, transceiver, processor;

the memory is used for storing a computer program;

the transceiver is used for receiving and transmitting data under the control of the processor;

the processor is configured to read the computer program in the memory and perform the following operations: receiving downlink control information DCI; the DCI includes a target indication field;

27. The terminal device of claim 26, wherein the DCI further comprises a first indication field; the processor is specifically configured to:

28. The terminal device of claim 27, wherein the first indication field comprises a target transport layer number indication;

29. The terminal device of claim 28, wherein the first indication field further comprises a channel sounding reference signal, SRS, resource set indication corresponding to the target transmission layer number indication;

30. The terminal device of claim 27, wherein the first indication field comprises a sum of a number of transport layers corresponding to the target indication field and a number of transport layers corresponding to a second indication field;

31. The terminal device of claim 27, wherein the first indication field includes a first identifier, the first identifier indicating whether a number of transport layers corresponding to the target indication field and a number of transport layers corresponding to a second indication field are the same, and the target number of transport layers is equal to the number of transport layers corresponding to the target indication field.

32. The terminal device of claim 27, wherein, in the case where the first indication field is an antenna port indication field, the acquiring, according to the first indication field, a target number of transmission layers includes:

33. The terminal device of claim 27, wherein the target number of transport layers is equal to the number of transport layers indicated by the second indication field.

34. The terminal device according to any of the claims 30 to 33, wherein the target indication field is a second transmission precoding indication TPMI field or a second sounding reference signal resource indication SRI field;

35. The terminal device of claim 26, wherein the processor is further configured to include:

36. The terminal device of claim 35, wherein a sounding reference signal, SRS, resource set indication in the DCI is used to indicate the target transmission mode.

37. The terminal device of claim 36, wherein the target transmission mode is any one of the following:

a space division multiplexing SDM transmission mode;

a time division multiplexing TDM transmission mode;

a single frequency network SFN transmission mode; or (b)

Frequency division multiplexing FDM transmission scheme.

38. The terminal device of claim 37, wherein the target transmission mode is determined to be the SDM transmission mode when at least one of:

39. The terminal device of claim 37, wherein the target transmission mode is determined to be the TDM transmission mode when at least one of:

40. The terminal device of any of claims 27 to 31 or 28 or 39, wherein the first indication field is an SRS resource set indication field, or a preset indication field, or a first TPMI field, or a first SRI field in the DCI.

41. The terminal device according to claim 38, wherein, in case the target transport is a TDM transport, the processor is configured to:

the target indication domain is the second TPMI domain or the second SRI domain, M is less than or equal to K, N is less than 2 to the power of K, and K is equal to the bit width of the indication domain where the first M bits or the first N code points are located.

42. The terminal device of claim 26, wherein the DCI further includes an antenna port indication field, and the processor is further configured to:

43. The terminal device of claim 42, wherein the number of transmission layers included in the correlation list corresponding to the antenna port indication field is determined based on any one of:

44. The terminal device of claim 35, wherein, in the case where the target transmission mode is one of an SDM transmission mode, an SFN transmission mode, or an FDM transmission mode, the processor is further configured to:

45. The terminal device of claim 44, wherein the bit width of the target indication field is any one of:

a total bit width of the first SRI domain and the second SRI domain in the DCI;

46. The terminal device of claim 35, wherein, in a case where the target transmission mode is any one of an SDM transmission mode, an SFN transmission mode, or an FDM transmission mode, and the target indication domain is at least any one of a preset information domain, a first SRI domain, a second SRI domain, a first TPMI domain, or a second TPMI domain, the processor is specifically configured to perform any one of:

wherein M and N are integers greater than or equal to 1, respectively.

47. The terminal device of claim 44, wherein the processor is further configured to perform at least one of:

48. The terminal device of claim 47, wherein a sum of the two target transport layers is equal to the third maximum transport layer number;

49. The terminal device of claim 26, wherein the processor is specifically configured to:

50. The terminal device of claim 26, wherein the processor is specifically configured to:

wherein the second transmission mode is an SDM transmission mode;

wherein the first set of targets is any one of:

an SRS resource set associated with the first transmission mode;

a preset set associated with the first transmission mode; or (b)

wherein the second set of targets is any one of:

the last M SRS resource sets of the plurality of SRS resource sets;

an SRS resource set associated with the second transmission mode;

a preset set associated with the second transmission mode; or (b)

m is an integer greater than or equal to 1.

51. A precoding matrix determining apparatus, comprising:

a determining module, configured to determine, according to the DCI, a precoding matrix corresponding to the target indication domain; the precoding matrix is used for sending the Physical Uplink Shared Channel (PUSCH) scheduled by the DCI.

52. A processor-readable storage medium, characterized in that the processor-readable storage medium stores a computer program for causing the processor to execute the method of determining a precoding matrix according to any one of claims 1 to 25.