CN116095647A - Transmission method and communication device for resource indication information - Google Patents

Abstract

The embodiment of the application provides a transmission method and a communication device of resource indication information, which are suitable for the fields of Internet of vehicles, intelligent network coupling, auxiliary driving, intelligent driving and the like, can solve the problem that available resources are limited by resource selection auxiliary information indication in the prior art, and further improves a Mode 2 (b) resource allocation Mode. In the method, a first terminal device sends first information to a second terminal device in a first time unit, the first information indicates K candidate single time unit resources to assist the second terminal device in selecting resources, the K candidate single time unit resources belong to Q time units in a time domain, the Q time units belong to a first selection window, the smallest time unit in the Q time units is located in an N time unit after the first time unit, the absolute value of the difference value of any two adjacent time units in the Q time units is P, the P is an integer larger than 1, and K, N is a positive integer.

Description

Resource indication information transmission method and communication device

Technical Field

Embodiments of the present application relate to the field of communications, and in particular to a method and a communication device for transmitting resource indication information.

Background Art

In the new radio (NR) system, the PC5 interface refers to the communication interface between terminal devices, and the transmission link in the PC5 interface is called the sidelink (SL).

Among them, according to the different resource allocation subjects, resource allocation (RA) in SL transmission can be divided into two modes: mode 1 and mode 2. In mode 1, the time-frequency resources used for SL transmission are centrally scheduled by the network equipment; in mode 2, the time-frequency resources used for SL transmission are determined by the terminal equipment. Mode 2 can further include mode 2(b): UE assists other UEs in selecting the time-frequency resources used for SL transmission. However, in mode 2(b), the UE sends resource selection assistance information to other UEs to indicate that there is a risk that the number of bits occupied by the time domain position in the candidate single-slot resource set is too large, and the number of bits that can be carried by the second-level sidelink control information (SCI) is limited, resulting in the total number of candidate single-slot resources carried in the resource assistance information being limited.

Summary of the invention

The embodiments of the present application provide a method, device and system for transmitting resource indication information, which solve the problem in the prior art that resource selection auxiliary information indicates limited available resources.

In the first aspect, a method for transmitting resource indication information is provided. The method can be executed by a first terminal device, or can also be executed by a component of the first terminal device (such as a chip or circuit). There is no limitation on this. For the sake of ease of description, the following is explained by taking the execution by the first terminal device as an example.

The method may include: a first terminal device determines a first time unit in a first selection window; the first terminal device sends first information to a second terminal device in the first time unit, the first information is used to assist the second terminal device in resource selection, the first information indicates K candidate single time unit resources, wherein K is a positive integer, the K candidate single time unit resources belong to Q time units in the time domain, the Q time units belong to the first selection window, the smallest time unit among the Q time units is the Nth time unit after the first time unit, the absolute value of the difference between any two adjacent time units among the Q time units is P time units, P is an integer greater than 1, and N is a positive integer.

The absolute value of the difference between any two adjacent time units in the Q time units is P time units. It can also be understood that the interval between any two adjacent time units in the Q time units is P-1 time units.

In the above technical solution, the resource selection auxiliary information (i.e., the first information) sent by the first terminal device to the second terminal device is taken as the core, and the time window scaling factor P is used to reduce the number of bits required to indicate the time domain information of K candidate single time units, thereby solving the problem of limited available resources indicated by the resource selection auxiliary information in the prior art and further improving the Mode 2 (b) resource allocation mode.

表示向下取整，Q为正整数。In combination with the first aspect, in some implementations of the first aspect, the smallest time unit among the Q time units is Q ₁ , and the largest time unit in the first selection window is T _end , wherein Q, T _end , P and Q ₁ satisfy

It means round down, Q is a positive integer.

In combination with the first aspect, in certain implementations of the first aspect, the first terminal device obtains first selection window information, the first selection window information including at least two of the start time unit of the selection window, the length of the first selection window, and the end time unit of the first selection window; the first terminal device determines the first selection window based on the first selection window information.

In combination with the first aspect, in some implementations of the first aspect, the first terminal device receives first selection window information from the second terminal device.

In combination with the first aspect, in some implementations of the first aspect, N is configured or pre-configured for the network device.

In combination with the first aspect, in certain implementations of the first aspect, the first information is indicated by M bits, where M is determined by Q time units, the first number of sub-channels and the total number of sub-channels included in the first resource pool, and the first number of sub-channels is the number of sub-channels occupied by each resource in the K candidate single time unit resources.

In combination with the first aspect, in some implementations of the first aspect, the M and Q time units, the number of first sub-channels, and the total number of sub-channels included in the first resource pool satisfy the following formula:

表示向上取整；Wherein, N _subCH is the total number of subchannels included in the first resource pool, L _subCH,2 is the number of first subchannels,

Indicates rounding up;

The first information is indicated by M bits, specifically:

个比特用于指示K个候选单时间单元资源的时域信息，M个比特中后

个比特用于指示K个候选单时间单元资源的频域信息。The first of the M bits

bits are used to indicate the time domain information of K candidate single time unit resources, and the latter

bits are used to indicate the frequency domain information of K candidate single time unit resources.

In combination with the first aspect, in some implementations of the first aspect, the M and Q time units, the number of first sub-channels, and the total number of sub-channels included in the first resource pool satisfy the following formula:

表示向上取整；Wherein, N _subCH is the total number of subchannels included in the first resource pool, L _subCH,2 is the number of first subchannels,

Indicates rounding up;

The first information is indicated by M bits, specifically:

个比特用于指示K个候选单时间单元资源的时域信息，M个比特中后

个比特用于指示K个候选单时间单元资源的频域信息。The first of the M bits

bits are used to indicate the time domain information of K candidate single time unit resources, and the latter

bits are used to indicate the frequency domain information of K candidate single time unit resources.

In combination with the first aspect, in some implementations of the first aspect, the M, the Q, the first number of sub-channels, and the total number of sub-channels in the first resource pool satisfy the following first formula:

M＝Q*(N _subCH -L _{subCH, 2} +1)

Wherein, N _subCH is the total number of sub-channels in the first resource pool, and L _subCH,2 is the number of the first sub-channels;

The first information is indicated by M bits, including:

The M bits constitute a bitmap, and for every N _subCH -L _{subCH, 2} +1 bits in the bitmap indicate the availability of each candidate single time unit resource on one time unit among the Q time units.

In combination with the first aspect, in certain implementations of the first aspect, the method also includes: the first terminal device sends second information, the second information includes P, Q, the first sub-channel number, N, or the number K of candidate single time unit resources indicated by the first information.

In combination with the first aspect, in certain implementations of the first aspect, the first information is carried in second-level sidelink control information SCI or media access control layer control element MAC CE, or radio resource control RRC signaling.

On the second aspect, a method for transmitting resource indication information is provided. The method can be executed by a second terminal device, or can also be executed by a component of the second terminal device (such as a chip or circuit). There is no limitation on this. For the sake of ease of description, the following is explained using the execution by the second terminal device as an example.

The method includes: a second terminal device receives first information from a first terminal device in a first time unit, the first information is used to assist the second terminal device in resource selection, the first information indicates K candidate single time unit resources, wherein K is a positive integer, the K candidate single time unit resources belong to Q time units in the time domain, the Q time units belong to a first selection window, the smallest time unit among the Q time units is the Nth time unit after the first time unit, the absolute value of the difference between any two adjacent time units among the Q time units is P time units, P is an integer greater than 1, and N is a positive integer; the second terminal device determines the first time-frequency resource according to the first information.

For the beneficial effects of the second aspect, please refer to the description of the first aspect and will not be repeated here.

In conjunction with the second aspect, in some implementations of the second aspect, the smallest time unit among the Q time units is Q ₁ , the largest time unit T _end in the first selection window is

表示向下取整，Q为正整数。Among them, Q, T _end , P and Q ₁ satisfy

It means round down, Q is a positive integer.

In combination with the second aspect, in certain implementations of the second aspect, the second terminal device sends first selection window information to the first terminal device, and the first selection window information includes at least two of the start time unit of the selection window, the length of the first selection window, and the end time unit of the first selection window.

In combination with the second aspect, in some implementations of the second aspect, P is obtained from the second terminal, or P is obtained from a network device, or P is preconfigured.

In combination with the second aspect, in some implementations of the second aspect, N is configured or pre-configured for the network device.

In combination with the second aspect, in certain implementations of the second aspect, the first information is indicated by M bits, where M is determined by Q time units, the first number of sub-channels and the total number of sub-channels included in the first resource pool, and the first number of sub-channels is the number of sub-channels occupied by each resource in the K candidate single time unit resources.

In conjunction with the second aspect, in some implementations of the second aspect, the M and Q time units, the number of first sub-channels, and the total number of sub-channels included in the first resource pool satisfy the following formula:

表示向上取整；Wherein, N _subCH is the total number of subchannels included in the first resource pool, L _subCH,2 is the number of first subchannels,

Indicates rounding up;

The first information is indicated by M bits, specifically:

个比特用于指示K个候选单时间单元资源的时域信息，M个比特中后

个比特用于指示K个候选单时间单元资源的频域信息。The first of the M bits

bits are used to indicate the time domain information of K candidate single time unit resources, and the latter

bits are used to indicate the frequency domain information of K candidate single time unit resources.

In conjunction with the second aspect, in some implementations of the second aspect, the M and Q time units, the number of first sub-channels, and the total number of sub-channels included in the first resource pool satisfy the following formula:

表示向上取整；Wherein, N _subCH is the total number of subchannels included in the first resource pool, L _subCH,2 is the number of first subchannels,

Indicates rounding up;

The first information is indicated by M bits, specifically:

个比特用于指示K个候选单时间单元资源的时域信息，M个比特中后

个比特用于指示K个候选单时间单元资源的频域信息。The first of the M bits

bits are used to indicate the time domain information of K candidate single time unit resources, and the latter

bits are used to indicate the frequency domain information of K candidate single time unit resources.

In combination with the second aspect, in some implementations of the second aspect, the M, the Q, the first number of sub-channels, and the total number of sub-channels in the first resource pool satisfy the following first formula:

M＝Q*(N _subCH -L _{subCH, 2} +1)

Wherein, N _subCH is the total number of sub-channels in the first resource pool, and L _subCH,2 is the number of the first sub-channels;

The first information is indicated by M bits, including:

The M bits constitute a bitmap, and for every N _subCH -L _{subCH, 2} +1 bits in the bitmap indicate the availability of each candidate single time unit resource on one time unit among the Q time units.

In combination with the second aspect, in certain implementations of the second aspect, the method also includes: the second terminal device receives second information, the second information includes P, Q, the first sub-channel number, N, or the number K of candidate single time unit resources indicated by the first information; the second terminal device is also used to parse the first information based on the second information.

In combination with the second aspect, in certain implementations of the second aspect, the first information is carried in second-level sidelink control information SCI or media access control layer control element MAC CE, or radio resource control RRC signaling.

In a third aspect, a communication device is provided, which is used to execute the method provided in the first aspect. Specifically, the device may include a unit and/or module, such as a processing unit and/or a communication unit, for executing the method provided in the first aspect or any one of the above implementations of the first aspect.

In one implementation, the apparatus is a first terminal device. When the apparatus is a first terminal device, the communication unit may be a transceiver, or an input/output interface; the processing unit may be at least one processor. Optionally, the transceiver may be a transceiver circuit. Optionally, the input/output interface may be an input/output circuit.

In another implementation, the device is a chip, a chip system or a circuit used in the first terminal device. When the device is a chip, a chip system or a circuit used in the first terminal device, the communication unit may be an input/output interface, an interface circuit, an output circuit, an input circuit, a pin or a related circuit on the chip, the chip system or the circuit; the processing unit may be at least one processor, a processing circuit or a logic circuit.

The beneficial effects of the method shown in the third aspect and its possible design above can refer to the beneficial effects in the first aspect and its possible design.

In a fourth aspect, a communication device is provided, which is used to execute the method provided in the second aspect. Specifically, the device may include a unit and/or module, such as a processing unit and/or a communication unit, for executing the method provided in the second aspect or any one of the above implementations of the second aspect.

In one implementation, the apparatus is a second terminal device. When the apparatus is a second terminal device, the communication unit may be a transceiver, or an input/output interface; the processing unit may be at least one processor. Optionally, the transceiver may be a transceiver circuit. Optionally, the input/output interface may be an input/output circuit.

In another implementation, the device is a chip, a chip system or a circuit used in a second terminal device. When the device is a chip, a chip system or a circuit used in a second terminal device, the communication unit may be an input/output interface, an interface circuit, an output circuit, an input circuit, a pin or a related circuit on the chip, the chip system or the circuit; the processing unit may be at least one processor, a processing circuit or a logic circuit.

The beneficial effects of the method shown in the fourth aspect and its possible design can refer to the beneficial effects in the second aspect and its possible design.

In a fifth aspect, a communication device is provided, comprising: at least one processor, the at least one processor is coupled to at least one memory, the at least one memory is used to store computer programs or instructions, and the at least one processor is used to call and run the computer program or instructions from the at least one memory, so that the communication device executes the method in the first aspect or any possible implementation thereof.

In one implementation, the apparatus is a first terminal device.

In another implementation, the apparatus is a chip, a chip system or a circuit used in the first terminal device.

The beneficial effects of the method shown in the fifth aspect and its possible design can refer to the beneficial effects in the first aspect and its possible design.

In a sixth aspect, a communication device is provided, comprising: at least one processor, the at least one processor is coupled to at least one memory, the at least one memory is used to store computer programs or instructions, and the at least one processor is used to call and run the computer program or instructions from the at least one memory, so that the communication device executes the method in the second aspect or any possible implementation thereof.

In one implementation, the apparatus is a second terminal device.

In another implementation, the apparatus is a chip, a chip system or a circuit used in a second terminal device.

The beneficial effects of the method shown in the sixth aspect and its possible design can refer to the beneficial effects in the second aspect and its possible design.

In a seventh aspect, the present application provides a processor for executing the methods provided in the above aspects.

For the operations such as sending and acquiring/receiving involved in the processor, unless otherwise specified, or unless they conflict with their actual function or internal logic in the relevant description, they can be understood as operations such as processor output, reception, input, etc., or as sending and receiving operations performed by the radio frequency circuit and antenna, and this application does not limit this.

In an eighth aspect, a computer-readable storage medium is provided, which stores a program code for execution by a device, and the program code includes a method for executing the first aspect or any one of the above-mentioned implementations of the first aspect or the second aspect or any one of the above-mentioned implementations of the second aspect.

In the ninth aspect, a computer program product comprising instructions is provided. When the computer program product is run on a computer, the computer executes the method provided by the first aspect or any one of the above-mentioned implementations of the first aspect or the second aspect or any one of the above-mentioned implementations of the second aspect.

In the tenth aspect, a chip is provided, the chip including a processor and a communication interface, the processor reads instructions stored in a memory through the communication interface, and executes the method provided by the first aspect or any one of the above-mentioned implementations of the first aspect or the second aspect or any one of the above-mentioned implementations of the second aspect.

Optionally, as an implementation, the chip also includes a memory, in which a computer program or instructions are stored, and the processor is used to execute the computer program or instructions stored in the memory. When the computer program or instructions are executed, the processor is used to execute the method provided by the first aspect or any one of the above-mentioned implementations of the first aspect or the second aspect or any one of the above-mentioned implementations of the second aspect.

In an eleventh aspect, a communication system is provided, which includes the communication device shown in the fifth aspect and the sixth aspect.

BRIEF DESCRIPTION OF THE DRAWINGS

FIG1 is a schematic diagram of a resource allocation mode 2(a) provided in an embodiment of the present application.

FIG2 is a schematic diagram of the structure of a candidate single-slot resource provided in an embodiment of the present application.

FIG3 is a schematic diagram of the relationship between a resource pool and a maximum candidate single-slot resource provided in an embodiment of the present application.

FIG4 is a schematic diagram of determining candidate single-slot resources based on listening results within a perception window provided in an embodiment of the present application.

FIG5 is a schematic diagram of a hidden node provided in an embodiment of the present application.

FIG6 is a schematic diagram of an exposed node provided in an embodiment of the present application.

FIG7 is a schematic diagram showing the relationship between the time slot n on the first terminal device side, the selection window corresponding to the time slot n, and the time slot m.

FIG8 is a schematic diagram showing a first terminal device determining resource selection auxiliary information based on a single candidate unit single time slot resource set.

FIG9 is a schematic diagram of the structure of a communication system provided in an embodiment of the present application.

FIG. 10 is a schematic diagram of the structure of a communication device provided in an embodiment of the present application.

FIG. 11 is a flow chart of a method for transmitting resource indication information provided in an embodiment of the present application.

FIG12 is a schematic diagram of Q time units provided in an embodiment of the present application.

FIG13 is a schematic diagram indicating K candidate single time unit resources provided in an embodiment of the present application.

FIG. 14 is a schematic diagram of the structure of a first terminal device provided in an embodiment of the present application.

FIG. 15 is a schematic diagram of the structure of a second terminal device provided in an embodiment of the present application.

DETAILED DESCRIPTION

The technical solution in this application will be described below in conjunction with the accompanying drawings.

In order to facilitate understanding of the technical solutions of the embodiments of the present application, a brief introduction to the relevant technologies or terms of the present application is first given as follows.

First, resource allocation mode 2:

Resource allocation mode 2 can be divided into the following categories: Mode 2 (a): The terminal device selects the time-frequency resources used for SL transmission based on its own sensing; Mode 2 (b): The terminal device assists other terminal devices in selecting the time-frequency resources used for SL transmission; Mode 2 (c): The terminal device selects the time-frequency resources used for SL transmission according to one or more SL sending patterns in a configured or pre-configured resource pool; Mode 2 (d): The terminal device with resource scheduling capability schedules the time-frequency resources used for SL transmission for other terminal devices.

In mode 2, there is one point in time and two windows of importance defined:

This time point refers to the time slot when the higher layer of the terminal device triggers resource selection for the transmission of a physical sidelink control channel (PSCCH) and/or a physical sidelink shared channel (PSSCH). As shown in Figure 1, this time slot can be called time slot n.

One of the two important windows is the sensing window, which refers to the window used by the terminal device to sense the occupancy of the time and frequency resources around itself. Exemplarily, it may correspond to the time slot range [nT ₀ ,nT _proc,0 ] in FIG1 , wherein T ₀ is a value calculated according to high-level parameters, T _proc,0 is a value defined by the standard, or a value obtained according to the capability or implementation of the terminal device, or a value calculated according to high-level parameters. The implementation of the terminal device may refer to the specific software algorithm and hardware implementation of the terminal (such as the computing chip, communication chip, storage chip, vehicle-mounted chip, vehicle-mounted module, etc. used by the terminal).

The other window of the two important windows is the selection window, which refers to the window used by the terminal device to select a candidate single-slot resource based on the perception result within the perception window. Exemplarily, it may correspond to the time slot range [n+T ₁ ,n+T ₂ ] in FIG. 1 , where T ₁ is a value obtained according to the implementation of the terminal device, and T ₂ is a value obtained according to a high-level parameter or the implementation of the terminal device.

It should be noted that in the embodiment of the present application, a time slot refers to a time unit used in a system (e.g., an NR system) to transmit uplink information, downlink information, or side information. A time slot may include multiple micro-time slots, and a micro-time slot may include one or more orthogonal frequency division multiplexing (OFDM) symbols. Optionally, a time slot or a micro-time slot may be the smallest scheduling unit in the time domain when transmitting uplink information, downlink information, or side information.

The above-mentioned candidate single-slot resources refer to: a subchannel set with a frequency domain length of L _subCH consecutive subchannels in a single time slot, wherein L _subCH is a high-level parameter provided by the high-level layer of the terminal device in the time slot (such as time slot n in Figure 1) that triggers resource selection, and L _subCH is a positive integer. The subchannel is a set of physical resource blocks (PRBs) containing N _PRB consecutive physical resource blocks (PRBs), N _PRB is a high-level configuration parameter of the resource pool, and N _PRB is a positive integer. Exemplarily, taking L _subCH = 2 and N _PRB = 10 as an example, as shown in Figure 2, it is a schematic diagram of a candidate single-slot resource.

In addition, a resource pool includes N _subCH continuous subchannels in the frequency domain, and N _subCH is a high-level configuration parameter of the resource pool. It can be seen that the maximum number of candidate single-slot resources on a single time slot of the resource pool is N _subCH -L _subCH +1. If N _subCH = 4, L _subCH = 2, then the maximum number of candidate single-slot sub-resources is N _subCH -L _subCH +1 = 3. For example, as shown in FIG3, the first candidate single-slot resource includes two subchannels numbered 0 and 1, the second candidate single-slot resource includes two subchannels numbered 1 and 2, and the third candidate single-slot resource includes two subchannels numbered 2 and 3.

In addition, the terminal device can determine one or more resource pools used for SL transmission based on high-level parameters. The high-level parameters can be pre-configured parameters of the terminal device or configuration parameters from the network device. Different resource pools can be distinguished using different resource pool identifiers.

Second, resource allocation model 2 (a):

Based on the above description, the basic process of resource allocation mode 2(a) can be summarized as follows:

Step 1: In time slot n, the high-level trigger of the terminal device selects time-frequency resources for the transmission of a PSCCH and/or PSSCH and provides high-level parameters;

Optionally, the high-level parameters include an identifier of a resource pool used when sending the PSCCH and/or PSSCH, a sending priority of the PSCCH and/or PSSCH, a number of subchannels used when sending the PSCCH and/or PSSCH, etc.

Step 2: The terminal device listens within the perception window to sidelink control information (SCI) sent by other terminal devices using the resource pool indicated in step 1;

Step 3: The terminal device senses the usage of the time-frequency resources in the selection window in the resource pool according to the listening result of step 2, and determines a set of available candidate single time-slot resources, wherein the set of available candidate single time-slot resources does not include time-frequency resources reserved for use by other terminal devices or that may be occupied by other terminal devices;

Step 4: The terminal device determines the time-frequency resources used for a PSCCH and/or PSSCH transmission based on the available candidate single-slot resource set.

Exemplarily, FIG4 is a schematic diagram of the terminal device determining the candidate single-slot resources according to the listening results in the perception window in the above step 3, wherein user equipment (UE) 1, UE2 and UE3 are other terminal devices except the terminal device, SCI1 is the SCI of UE1 detected by the terminal device in the perception window, and SCI1 indicates that UE1 has reserved some time-frequency resources in the selection window, then the terminal device can exclude the time-frequency resources reserved by UE1. Similarly, SCI2 is the SCI of UE2, and SCI3 is the SCI of UE3. The terminal device can exclude the time-frequency resources reserved by UE2 and UE3 according to SCI2 and SCI3, respectively, so as to determine the available candidate single-slot resource set.

Third, hidden nodes and exposed nodes:

In the above mode 2(a), there are problems of hidden nodes and exposed nodes.

Among them, if terminal device 1 cannot obtain the usage and reservation status of the time and frequency resources of terminal device 2 through mode 2 (a), then terminal device 2 is called a hidden node of terminal device 1.

Exemplarily, as shown in FIG5 , UE1, UE2, and UE3 all work in mode 2 (a). UE1 and UE3 both have data to send to UE2, as indicated by black arrows, and the perception ranges of UE1 and UE3 are delimited by two corresponding dotted boxes. Since UE3 is outside the perception range of UE1, UE1 cannot obtain the usage and reservation of UE3's time-frequency resources through perception, and UE3 is a hidden node for UE1. Similarly, UE1 is also a hidden node for UE3. When UE1 selects SL time-frequency resources to send data to UE2 based on the perception results, since UE1 has not obtained the usage and reservation of UE3's time-frequency resources, it may select the same time-frequency resources as UE3, so that UE2 cannot distinguish the data of UE1 and UE3 when receiving data, resulting in collisions and mutual interference, which may cause the data transmission from UE1 and UE3 to UE2 to fail.

If terminal device 1 can obtain the usage and reservation status of the time and frequency resources of terminal device 2 through mode 2 (a), but the SL transmission of terminal device 2 does not cause strong interference to the SL transmission of terminal device 1, that is, it does not affect the SL transmission of terminal device 1, then terminal device 2 is called an exposed node of terminal device 1.

Exemplarily, as shown in FIG6 , UE1, UE2, UE3, and UE4 all work in mode 2 (a). UE1 has data to send to UE2, and UE3 has data to send to UE4, as indicated by black arrows. The sensing ranges of UE1 and UE3 are delimited by two corresponding dashed boxes. Since UE3 is within the sensing range of UE1, UE1 can obtain the time-frequency resource usage and reservation status of UE3 through sensing. However, since the SL transmission of UE3 is the transmission between UE3 and UE4, it will not affect the SL transmission from UE1 to UE2. UE3 is an exposed node to UE1. Similarly, UE1 is an exposed node to UE3. When UE1 senses, the SL time-frequency resources reserved by UE3 will be excluded. However, since the receivers of UE1's SL transmission and UE3's SL transmission are different, UE1 can actually use the SL time-frequency resources reserved by UE3. That is to say, UE1's exclusion of the SL time-frequency resources reserved by UE3 during SL transmission will result in a decrease in resource utilization.

Fourth, resource allocation model 2 (b):

Mode 2 (b) resource allocation mode allows UE to use its own perception results to assist other UEs in selecting SL time-frequency resources, which is a feasible method to solve hidden nodes and exposed nodes. For example, in Figure 5, UE2 can assist UE1 in resource selection to avoid interference with UE3. For another example, in Figure 6, UE2 can assist UE1 in resource selection to improve the utilization of time-frequency resources.

In the following description, it is agreed that the first terminal device is a terminal device that sends resource selection auxiliary information, and the second terminal device is a terminal device that receives resource selection auxiliary information.

Based on the above description, the basic process of resource allocation mode 2(b) can be summarized as follows:

Step 1: The first terminal device determines a time slot for sending resource selection auxiliary information, where the resource selection auxiliary information is auxiliary information used to assist the second terminal device in performing resource selection.

Specifically, in time slot n, the high-layer triggered physical layer of the first terminal device selects time-frequency resources _for sending resource selection auxiliary information; relative to time slot n, the first terminal device determines a set of candidate single time slot resources within the selection window [n+T ₁ ,n+T ₂ ] based on the perception results within the perception window [nT 0 ,nT _proc,0 ], and the set can be expressed as _SA (n,L _subCH,1 ), where n represents time slot n, and L _subCH,1 represents the number of subchannels of candidate single time slot resources required for sending a PSCCH and/or PSSCH containing resource selection auxiliary information; the first terminal device selects a candidate single time slot resource on time slot m according to the set _SA (n,L _subCH,1 ), and determines to send resource selection auxiliary information to the second terminal device on the candidate single time slot resource, and the resource selection auxiliary information is auxiliary information used to assist the second terminal device in resource selection, and m is an integer greater than or equal to n. For example, FIG7 shows a schematic diagram of the relationship between the time slot n on the first terminal device side, the selection window corresponding to the time slot n, and the time slot m.

Step 2: The first terminal device triggers a resource selection process for resource selection auxiliary information.

Specifically, in time slot n, the high-layer triggers the physical layer of the first terminal device _to select time-frequency resources for sending auxiliary information for resource selection; relative to time slot n, the first terminal device determines the set of candidate single time slot resources within the selection window [n+T ₁ ,n+T ₂ ] according to the perception results within the perception window [nT 0 ,nT _proc,0 ], and the set can be expressed as S _A (n,L _subCH,2 ), where n represents time slot n, and L _subCH,2 represents the number of subchannels of candidate single time slot resources required for a PSCCH and/or PSSCH transmission of the second terminal device; the physical layer of the first terminal device reports the set S _A (n,L _subCH,2 ) to the high-layer of the first terminal device.

It should be noted that if the number of subchannels of candidate single-slot resources required for a PSCCH and/or PSSCH transmission by the second terminal device is the same as the number of subchannels of candidate single-slot resources required for a PSCCH/PSSCH transmission containing resource selection auxiliary information, that is, L _subCH,2 =L _subCH,1 , then the first terminal device does not need to perform step 2.

Step 3: The first terminal device determines resource selection auxiliary information based on one or more candidate single-slot resource sets.

In a possible implementation manner, the first terminal device determines the resource selection auxiliary information to be sent in time slot m according to a single set _SA (n,L _subCH,2 ).

Optionally, the specific form of the resource selection auxiliary information may be the perception result of the first terminal device within a window of length Y time slots starting from time slot m+T+1, where T is an integer greater than or equal to 0, and Y is a positive integer. The perception result may be a subset of S _A (n,L _subCH,2 ) within the window of Y time slots, and the subset may be expressed as S _Y (m,L _subCH,2 ).

Exemplarily, as shown in Fig. 8, the upper layer of the first terminal device triggers resource selection in time slot n, and obtains a candidate single-slot resource set _SA (n, L _{subCH, 2} ) within the selection window according to L subCH, _2. Optionally, the first terminal device may determine resource selection auxiliary information according to a subset _SY (m, L _{subCH, 2} ) of _SA (n, L _{subCH, 2} ) within the window [m+T+1, m+T+Y].

In one possible implementation, the first terminal device determines the resource selection auxiliary information to be sent in time slot m based on multiple sets. The multiple sets may be _SA (n, L _{subCH, 2} ), _SA (n+1, L _{subCH, 2} ), ..., _SA (n ₂ , L _{subCH, 2} ), where n ₂ is an integer greater than or equal to n and less than or equal to m. Optionally, the specific form of the resource selection auxiliary information may be the perception result of the first terminal device within a window of length Y time slots starting from time slot m+T+1, and the perception result may be a set of candidate single time slot resources within the window of Y time slots determined jointly based on multiple sets, and the subset may be represented as S _Y (m, L _{subCH, 2} ).

Optionally, S _Y (m,L _subCH,2 ) may be a subset of the intersection of multiple sets within a window of Y time slots. The significance of using the intersection is that, for a candidate single time slot resource, only when multiple sets all include the candidate single time slot resource, the candidate single time slot resource is considered to be included in S _Y (m,L _subCH,2 ).

Optionally, S _Y (m,L _subCH,2 ) can be initialized as a subset of S _A (n,L _subCH,2 ) within a window of Y time slots, and then S _Y (m,L _subCH,2 ) is updated according to the rules defined by the standard.

Step 4: The first terminal device sends resource selection auxiliary information to the second terminal device.

Correspondingly, the second terminal device receives the resource selection auxiliary information from the first terminal device, and performs resource selection according to the resource selection auxiliary information.

Specifically, in the m time slot, the first terminal device sends resource selection auxiliary information to the second terminal device through the second-stage SCI, or MAC CE, or PC5-RRC signaling. It should be understood that the second-stage SCI is transmitted in the PSSCH, which has better flexibility than the first-stage SCI (1st-stage SCI, or SCI format 0-1) transmitted in the PSCCH, and can therefore be used to carry resource selection auxiliary information.

Optionally, the specific form of the resource selection auxiliary information can be a set S _Y (m,L _subCH,2 ) of K candidate single time slot resources in a window with a length of Y time slots starting from time slot m+T+1, where K is a positive integer. The resource selection auxiliary information can indicate S _Y (m,L _subCH,2 ) through a bit map.

In one implementation, for a resource pool including N _subCH subchannels, resource selection auxiliary information is indicated by _X1 + _X2 bits, wherein _X1 bit is used to indicate time domain information of each candidate single time slot resource, and _X2 bit is used to indicate frequency domain information of each candidate single time slot resource, and both _X1 and _X2 are natural numbers.

The number of bits _X1 is determined according to formula (1):

X ₁ =log ₂ (Y ^K )

表示向上取整。This is because there are Y possible time domain positions for each candidate single-slot resource in S _Y (m,L _subCH,2 ), and the K candidate single-slot resources correspond to Y ^K possibilities, where

Indicates rounding up.

The number of bits _X2 is determined by formula (2):

This is because the maximum number of candidate single-slot resources in a single time slot is N _subCH -L _subCH,2 +1, that is, the frequency domain position of each candidate single-slot resource has N _subCH -L _subCH,2 +1 possibilities, and the K candidate single-slot resources correspond to (N _subCH -L _subCH,2 +1) ^K possibilities.

According to the standard setting, in formula (2), Y is calculated as 512 at the maximum, N _subCH is calculated as 27 at the maximum, and L _subCH,2 is calculated as 1 at the minimum. When K reaches 8, the maximum number of occupied bits M will reach 119. The second-level SCI is carried by PSSCH, and PSSCH is sent by polar code. Considering factors such as interleaving, the maximum input of polar code is only 140 bits, which also includes 24 bits of CRC check code. Therefore, the amount of resource selection auxiliary information that can be indicated by the second-level SCI in the above scheme is very limited.

The technical solutions in the embodiments of the present application will be described below in conjunction with the drawings in the embodiments of the present application. Among them, in the description of the present application, unless otherwise specified, "/" indicates that the objects associated before and after are in an "or" relationship, for example, A/B can represent A or B; "and/or" in the present application is only a description of the association relationship of the associated objects, indicating that there can be three relationships, for example, A and/or B can represent: A exists alone, A and B exist at the same time, and B exists alone, where A and B can be singular or plural. In addition, in the description of the present application, unless otherwise specified, "at least one" refers to one or more, and "multiple" refers to two or more than two. "At least one of the following" or similar expressions refers to any combination of these items, including any combination of single items or plural items. For example, at least one of a, b, or c can represent: a, b, c, a-b, a-c, b-c, or a-b-c, wherein "-" represents that the objects associated before and after are a kind of "and" relationship, and a, b, c can be single or multiple. In addition, in order to facilitate the clear description of the technical scheme of the embodiment of the present application, in the embodiment of the present application, the words such as "first" and "second" are used to distinguish the same items or similar items with basically the same functions and effects. Those skilled in the art will understand that the words such as "first" and "second" do not limit the quantity and execution order, and the words such as "first" and "second" do not limit to be necessarily different.

The technical solutions of the embodiments of the present application can be applied to various communication systems. For example: the fifth generation (5th generation, 5G) communication system and other systems. The term "system" can be interchangeably used with "network". The 5G communication system is the next generation communication system under study. Among them, the 5G communication system includes a non-standalone (NSA) 5G mobile communication system, a standalone (SA) 5G mobile communication system, or a NSA 5G mobile communication system and a SA 5G mobile communication system. In addition, the communication system can also be applied to future-oriented communication technologies, and the technical solutions provided in the embodiments of the present application are applicable. The above-mentioned communication system applicable to the present application is only an example, and the communication system applicable to the present application is not limited to this. It is uniformly described here and will not be repeated below.

In addition, the technical solution provided in the embodiment of the present application can be applied to cellular links, and can also be applied to links between devices, such as device to device (D2D) links or vehicle to everything (V2X) links. D2D links or V2X links can also be called side links, auxiliary links or side links, etc. In the embodiment of the present application, D2D links, V2X links, side links, auxiliary links or side links all refer to links established between devices of the same type, and their meanings are the same. The so-called devices of the same type can be links between terminal devices and terminal devices, or links between relay nodes and relay nodes, etc., which are not limited in the embodiment of the present application. For links between terminal devices and terminal devices, there are D2D links defined in 3GPP versions (Rel)-12/13, and there are also V2X links defined by 3GPP for vehicle to vehicle, vehicle to mobile phone, or vehicle to any entity, including Rel-14/15. It also includes Rel-16 and subsequent versions of V2X links based on NR systems that are currently being studied by 3GPP.

As shown in FIG9 , a communication system 10 is provided in an embodiment of the present application. The communication system 10 includes a first terminal device 20 and a second terminal device 30. The first terminal device 20 and the second terminal device 30 can communicate directly through the PC5 interface, and the direct communication link between the first terminal device 20 and the second terminal device 30 is the SL.

Optionally, the terminal device (including the first terminal device and the second terminal device) in the embodiment of the present application is a device for implementing a wireless communication function, such as a terminal or a chip that can be used in a terminal, etc. The terminal may be a user equipment (UE), an access terminal, a terminal unit, a terminal station, a mobile station, a mobile station, a remote station, a remote terminal, a mobile device, a wireless communication device, a terminal agent or a terminal device, etc. in a 5G network or a future evolved PLMN. The access terminal may be a cellular phone, a cordless phone, a session initiation protocol (SIP) phone, a wireless local loop (WLL) station, a personal digital assistant (PDA), a handheld device with wireless communication function, a computing device or other processing device connected to a wireless modem, a vehicle-mounted device or a wearable device, a virtual reality (VR) terminal device, an augmented reality (AR) terminal device, a wireless terminal in industrial control, a wireless terminal in self driving, a wireless terminal in remote medical, a wireless terminal in smart grid, a wireless terminal in transportation safety, a wireless terminal in smart city, a wireless terminal in smart home, etc. The terminal may be mobile or fixed. The terminal device in the embodiment of the present application can also be a vehicle-mounted module, vehicle-mounted module, vehicle-mounted component, vehicle-mounted chip or vehicle-mounted unit that is built into the vehicle as one or more components or units. The vehicle can implement the method of the present application through the built-in vehicle-mounted module, vehicle-mounted module, vehicle-mounted component, vehicle-mounted chip or vehicle-mounted unit.

Optionally, the terminal device (including the first terminal device 20 and the second terminal device 30) in the embodiment of the present application can also be referred to as a communication device, which can be a general device or a dedicated device, and the embodiment of the present application does not make specific limitations on this.

Optionally, in the embodiment of the present application, the first terminal device 20 and the second terminal device 30 in FIG. 9 may be implemented by the communication device (or communication apparatus) 50 in FIG. 10. FIG. 10 is a schematic diagram of the structure of the communication device 50 provided in the embodiment of the present application. The communication device 50 includes one or more processors 501, and at least one communication interface (FIG. 8 is only exemplary to include a communication interface 504 and a processor 501 as an example for explanation), and may optionally include a memory 503; and may optionally include a communication bus 502.

Optionally, the processor 501 , the communication interface 504 , or the memory 503 may be coupled together (not shown in FIG. 10 ), or, as shown in FIG. 10 , may be connected together via a communication bus 502 .

The processor 501 may be a general-purpose central processing unit (CPU), a microprocessor, an application-specific integrated circuit (ASIC), or one or more integrated circuits for controlling the execution of the program of the present application.

The communication bus 502 may be a peripheral component interconnect (PCI) bus or an extended industry standard architecture (EISA) bus, etc. The bus may be divided into an address bus, a data bus, a control bus, etc. For ease of representation, FIG. 10 is represented by only one dotted line, but does not mean that there is only one bus or one type of bus. The communication bus 502 may be used to connect different components in the communication device 50 so that different components can communicate.

The communication interface 504 may be a transceiver module for communicating with other devices or communication networks, such as Ethernet, radio access network (RAN), wireless local area network (WLAN), etc. For example, the transceiver module may be a device such as a transceiver or a transceiver. Optionally, the communication interface 504 may also be a transceiver circuit located in the processor 501 to implement signal input and signal output of the processor.

The memory 503 may be a device with a storage function. For example, it may be a read-only memory (ROM) or other types of static storage devices that can store static information and instructions, a random access memory (RAM) or other types of dynamic storage devices that can store information and instructions, or an electrically erasable programmable read-only memory (EEPROM), a compact disc read-only memory (CD-ROM) or other optical disc storage, optical disc storage (including compressed optical disc, laser disc, optical disc, digital versatile disc, Blu-ray disc, etc.), a magnetic disk storage medium or other magnetic storage device, or any other medium that can be used to carry or store the desired program code in the form of instructions or data structures and can be accessed by a computer, but is not limited thereto. The memory may exist independently and be connected to the processor via a communication line 502. The memory may also be integrated with the processor.

The memory 503 is used to store computer instructions for executing the solution of the present application, and the execution is controlled by the processor 501. The processor 501 is used to execute the computer instructions stored in the memory 503, thereby realizing the method provided in the embodiment of the present application.

Alternatively, optionally, in an embodiment of the present application, the processor 501 may also perform processing-related functions in the method provided in the following embodiments of the present application, and the communication interface 504 is responsible for communicating with other devices or communication networks, which is not specifically limited in the embodiments of the present application.

Optionally, the computer instructions in the embodiments of the present application may also be referred to as application code, which is not specifically limited in the embodiments of the present application.

In a specific implementation, as an embodiment, the processor 501 may include one or more CPUs, such as CPU0 and CPU1 in FIG. 10 .

In a specific implementation, as an embodiment, the communication device 50 may include multiple processors, such as the processor 501 and the processor 508 in FIG. 10. Each of these processors may be a single-core (single-CPU) processor or a multi-core (multi-CPU) processor. The processor here may refer to one or more devices, circuits, and/or processing cores for processing data (e.g., computer program instructions).

In a specific implementation, as an embodiment, the communication device 50 may further include an output device 505 and an input device 506. The output device 505 communicates with the processor 501 and may display information in a variety of ways. For example, the output device 505 may be a liquid crystal display (LCD), a light emitting diode (LED) display device, a cathode ray tube (CRT) display device, or a projector. The input device 506 communicates with the processor 501 and may receive user input in a variety of ways. For example, the input device 506 may be a mouse, a keyboard, a touch screen device, or a sensor device.

It is understood that the structure shown in FIG10 does not constitute a specific limitation on the terminal device. For example, in other embodiments of the present application, the terminal device may include more or fewer components than shown in the figure, or combine certain components, or split certain components, or arrange the components differently. The components shown in the figure may be implemented in hardware, software, or a combination of software and hardware.

In the following, in conjunction with the accompanying drawings, the method for transmitting resource indication information provided in an embodiment of the present application will be described in detail by taking the interaction between the first terminal device 20 and the second terminal device 30 shown in Figure 9, with the first terminal device acting as a data sending end and the second terminal device acting as a data receiving end as an example.

It should be noted that the message names between network elements or the names of parameters in the messages in the following embodiments of the present application are merely examples, and other names may be used in specific implementations, and the embodiments of the present application do not impose any specific limitations on this.

As shown in FIG. 11 , a method for transmitting resource indication information provided in an embodiment of the present application includes the following steps:

S1101. A first terminal device determines a first time unit in a first selection window.

This step refers to step 1 in the basic process of resource allocation mode 2 (b) above, and will not be described here. Taking Figure 12 as an example, the first selection window in this step is [T _start , T _end ], and the first time unit is the time unit m for sending resource auxiliary information (i.e., the first information in this embodiment). The first information will be described in detail below and will not be described here.

Optionally, the method also includes: the first terminal device obtains first selection window information, the first selection window information includes at least two of the start time unit of the first selection window, the length of the first selection window, and the end time unit of the first selection window; the first terminal device determines the first selection window based on the first selection window information.

It should be noted that, since the first information is used to assist the second terminal device in performing resource assistance, T _start and T _end in this embodiment are determined according to parameters related to the second terminal device, that is, the first selection window in this embodiment is related to the second terminal device.

Optionally, the first terminal device receives first selection window information from the second terminal device.

It should be noted that in the embodiment of the present application, the time unit can be an OFDM symbol, a mini-time slot, a time slot, a subframe, a frame, or one of the minimum scheduling units in the time domain.

S1102: The first terminal device sends first information to the second terminal device in a first time unit. Correspondingly, the second terminal device receives the first information in the first time unit.

Among them, the first information is used to assist the second terminal device in resource selection, and the first information indicates K candidate single time unit resources, where K is a positive integer. The K candidate single time unit resources belong to Q time units in the time domain, and the Q time units belong to the first selection window. The smallest time unit among the Q time units is located at the Nth time unit after the first time unit. The absolute value of the difference between any two adjacent time units among the Q time units is P time units, where P is an integer greater than 1, and N is a positive integer. For example, there are 20 consecutive time slots, which are from time slot 1 to time slot 20 in ascending order, and Q=4 time slots are located at time slot 2, time slot 8, time slot 14, and time slot 20, respectively, then P=6.

Optionally, P in the present application may be referred to as a time window scaling factor, which is not specifically limited in the present application.

Optionally, P and/or N are preconfigured or network device configured or predefined, which is not limited in this application.

Optionally, P may be a preconfigured mapping table. For example, if P is configured with only four values, 5, 8, 10, and 15, then P may be indicated by 2 bits.

Optionally, when N is predefined, the value of N is defined as T _{proc, 1 ,} which is defined in Rel-16. Table 1 shows possible values of N, where μ _SL takes 0, 1, 2, and 3 to indicate subcarrier spacings of 15, 30, 60, and 120, respectively.

Table 1

μ _SL T _proc,1 0 3 1 5 2 17 3 3

It should be noted that the K candidate single time unit resources are respectively located in different time units in the time domain.

It should also be noted that since the first information is used to assist the second terminal device in selecting resources, the candidate single time unit resource among the K candidate single time unit resources indicated by the first information includes one time unit in the time domain, and the number of subchannels included in the frequency domain is the first subchannel number, which is the number of subchannels of the candidate single time unit resources required for the second terminal device to send a PSSCH and/or PSCCH once.

Optionally, the number of the first sub-channels may be sent by the second terminal device to the first terminal device; or, it may be determined by the first terminal device itself, for example, the first terminal device determines it based on historical data with the second terminal device, or current channel usage status, etc.; or, it may be stipulated by the protocol, and the embodiments of the present application do not make specific limitations on this.

It should be noted that in an embodiment of the present application, the candidate single time unit resource may also include one or more continuous PRBs, or one or more continuous subcarriers, or one or more continuous minimum scheduling units in the frequency domain. That is, the candidate single time unit resource includes one time unit in the time domain and one or more continuous subchannels in the frequency domain; or, the candidate single time unit resource includes one time unit in the time domain and one or more continuous PRBs in the frequency domain; or, the candidate single time unit resource includes one time unit in the time domain and one or more continuous minimum scheduling units in the frequency domain. The following embodiments of the present application are described by taking the example that the candidate single time unit resource includes one time unit in the time domain and one or more continuous subchannels in the frequency domain.

表示向下取整，Q为正整数。Optionally, the smallest time unit among the Q time units is Q ₁ , and the largest time unit in the first selection window is T _end , wherein Q, T _end , P and Q ₁ satisfy

It means round down, Q is a positive integer.

Taking FIG. 7 as an example, the smallest time unit Q ₁ among the Q time units is located at the Nth time unit after the first time unit, which can be understood as: the smallest time unit among the Q time units is Q ₁ =m+N. The end time unit T _end of the first selection window. Then, the K candidate single time unit resources indicated by the first indication information are part or all of the single time unit resources whose time domain positions are located on the Q time units determined by the period P starting from the time unit m+N. Specifically, the Q time units may be m+N, m+N+P, m+N+2*P, ..., m+N+(Q-1)*P, and so on. Here, Q time units are illustrated in conjunction with FIG. 12.

个时间单元上的部分或全部单时间单元资源，这4个时间单元分别为m+N、m+N+P、m+N+2*P、m+N+3*P，因此K个候选单时间单元资源为时域位置位于m+N的资源1、时域位置位于m+N+2*P的资源2、时域位置位于m+N+2*P的资源3和时域位置位于m+N+3*P的资源4中部分或全部，此时，K为小于或等于4的正整数。Exemplarily, as shown in FIG12, the first terminal device triggers the selection of time-frequency resources for the transmission of the first information in the time unit n. For example, the starting time unit of the first selection window is T _start , the maximum time unit T _end in the first selection window, P = 2, the smallest time unit among the Q time units is Q1 = m + N, the number of the first sub-channel is equal to 2, and the K candidate single time unit resources are located in the window [m + T + 1, T _end ] in the time domain.

The K candidate single time unit resources are part or all of the single time unit resources on four time units, which are m+N, m+N+P, m+N+2*P, and m+N+3*P respectively. Therefore, the K candidate single time unit resources are part or all of resource 1 whose time domain position is m+N, resource 2 whose time domain position is m+N+2*P, resource 3 whose time domain position is m+N+2*P, and resource 4 whose time domain position is m+N+3*P. At this time, K is a positive integer less than or equal to 4.

Optionally, the first information may be indicated by M bits, where the M bits are determined by Q, the first number of subchannels, and the total number of subchannels in the first resource pool.

For example, the first information is indicated by X1+X2=M bits, where the X1 bit is used to indicate the time domain information of each candidate single time slot resource, and the X2 bit is used to indicate the frequency domain information of each candidate single time slot resource, and both X1 and X2 are integers greater than or equal to 0.

In a specific implementation, X1, X2, Q, the number of first sub-channels, and the total number of sub-channels in the first resource pool respectively satisfy the following formula:

That is, M and Q, the number of the first sub-channels, and the total number of sub-channels in the first resource pool satisfy the following formula (3):

表示向上取整。Wherein, N _subCH is the total number of subchannels in the first resource pool, L _subCH,2 is the number of first subchannels,

Indicates rounding up.

It can be understood that, among the K candidate single time unit resources indicated by the first information, there are Q possible time domain positions of each candidate single time unit resource, and the K candidate single time unit resources correspond to Q ^K possibilities. Therefore, as shown in Figure 13, X1 bits can indicate the time domain information of K candidate single time unit resources.

It can be understood that the maximum number of candidate single time unit resources on a single time unit is N _subCH -L _subCH,2 +1, and the frequency domain position of each candidate single time unit resource has N _subCH -L _subCH,2 +1 possibilities. Then, the frequency domain positions of the K candidate single time unit resources have a total of (N _subCH -L _subCH,2 +1) ^K possibilities. Therefore, as shown in Figure 13, X2 bits can indicate the frequency domain information of the K candidate single time unit resources.

比特指示1个候选单时间单元资源的时域信息，

比特指示1个候选单时间单元资源的频域信息。对于3个候选单时间单元资源,共需要6*3+2*3＝24比特指示3个候选单时间单元资源的时域信息和频域信息。如果K个候选单时间单元资源中的资源#1的时域位置位于Q个时间单元中的第11个时间单元上，则可以用000101表示资源#1的时域信息。For example, in FIG. 12 , n=1, T _start =5, T _end =401, m=10, N=7, P=10, K=3, N _subCH =5, L _subCH,2 =2, m+N=17, Q satisfies m+T+1+(Q-1)*P≤T _end , and Q=39 can be obtained. Then

The bit indicates the time domain information of a candidate single time unit resource.

The bit indicates the frequency domain information of one candidate single time unit resource. For three candidate single time unit resources, a total of 6*3+2*3=24 bits are required to indicate the time domain information and frequency domain information of the three candidate single time unit resources. If the time domain position of resource #1 among the K candidate single time unit resources is located at the 11th time unit among the Q time units, the time domain information of resource #1 can be represented by 000101.

It can be seen that in the above example, K=3 is indicated by the first terminal device through formula (3), and the number of bits required to indicate the time domain information of K candidate single time unit resources is log ₂ (39 ³ ), while the number of bits required to indicate the time domain information of K=3 candidate single time unit resources through formula (1) in the prior art is log ₂ (385 ³ ), wherein 385 is the window length between the smallest time unit among the Q time units and the largest time unit T _end in the first selection window, that is, T _end - (m+N)+1=401-17+1=385. It can be seen that the present application requires a smaller number of bits to indicate the same candidate single time unit resource, thereby solving the problem of limited available resources for SCI indicating the first information in the prior art.

In another specific implementation, X1, X2, Q, the number of first sub-channels, and the total number of sub-channels in the first resource pool respectively satisfy the following formula:

That is, M and Q, the number of the first sub-channels, and the total number of sub-channels in the first resource pool satisfy the following formula (4):

个比特用于指示所述K个候选单时间单元资源的时域信息，所述M个比特中后

个比特用于指示所述K个候选单时间单元资源的频域信息。The first information is indicated by M bits, specifically: the first

bits are used to indicate the time domain information of the K candidate single time unit resources, and the latter

bits are used to indicate the frequency domain information of the K candidate single time unit resources.

The method indicated by X1 in formula (4) is applicable to the case where the time domains do not overlap.

In another specific implementation, M and Q, the number of first sub-channels, and the total number of sub-channels in the first resource pool satisfy the following formula (5):

M＝Q*(N _subCH -L _{subCH, 2} +1)

Wherein, N _subCH is the total number of subchannels in the first resource pool, and L _subCH,2 is the number of first subchannels;

The first information is indicated by M bits, including: the M bits constitute a bit map, and for each N _subCH -L _{subCH in the bit map, 2} +1 bits indicate availability of each candidate single time unit resource in one time unit among Q time units.

Optionally, when K candidate single time unit resources are indicated by the first information, the method provided by the present application may further include: the first terminal device sends the second information to the second terminal device. Accordingly, the second terminal device receives the second information from the first terminal device and parses the first information according to the second information. The content of the second information is described in detail in S1103 and will not be described here.

Optionally, the first terminal device may send the first information to the second terminal device in a variety of ways.

In a possible implementation, the first terminal device sending the first information to the second terminal device may include: the first terminal device sending the second-level SCI to the second terminal device, the second-level SCI including the first information. Correspondingly, the second terminal device receiving the first information from the first terminal device may include: the second terminal device receiving the second-level SCI from the first terminal device.

Based on this solution, since the second-level SCI is transmitted in the PSSCH, it has better flexibility than the first-level SCI transmitted in the PSCCH. Therefore, transmitting the first information through the second-level SCI can improve the transmission flexibility of the first information.

In another possible implementation, the first terminal device sending the first information to the second terminal device may include: the first terminal device sending a medium access control layer control element (MAC CE) to the second terminal device, the MAC CE including the first information. Correspondingly, the second terminal device receiving the first information from the first terminal device may include: the second terminal device receiving the MAC CE from the first terminal device.

In another possible implementation, the first terminal device sending the first information to the second terminal device may include: the first terminal device sending a radio resource control (RRC) signaling to the second terminal device, the RRC signaling including the first information. Correspondingly, the second terminal device receiving the first information from the first terminal device may include: the second terminal device receiving the RRC signaling from the first terminal device. It can be understood that the RRC signaling may be PC5-RRC signaling.

Optionally, the first terminal device may send the first information to the second terminal device only through one of the above three methods, for example, sending information of K candidate single time unit resources to the second terminal device through the second-level SCI; or the first terminal device may send the first information to the second terminal device through a combination of multiple of the above three methods, for example, sending information of some candidate single time unit resources among the K candidate single time unit resources to the second terminal device through SCI, and sending information of another part of the K candidate single time unit resources to the second terminal device through MAC CE.

S1103. The second terminal device determines the first time-frequency resource according to the first information.

Among them, the first time-frequency resource is used for the second terminal device to send PSSCH and/or PSCCH.

Optionally, the second terminal device determines the first time-frequency resource based on the first information, which may include: the second terminal device determines part or all of the K candidate single time unit resources indicated by the first information as the first time-frequency resource.

Optionally, when the first indication information is indicated by M bits, and the value of the M bits satisfies the above formula (3), the method for transmitting resource indication information provided by the present application may further include: the first terminal device sends the second information to the second terminal device. Correspondingly, the second terminal device receives the second information from the first terminal device, and parses the first information according to the second information.

The second information may include at least one of the following: Q, a time window scaling factor P, the number K of candidate single time unit resources indicated by the first information, the number of first subchannels and N. The role of sending the above parameters is described in detail below.

Time window scaling factor P: The second terminal device parses the time domain information of the corresponding K candidate resources according to the value of P. When P is predefined, this parameter does not need to be sent.

比特对应的时域信息，也可以帮助第二终端设备解析

特对应的频域信息。需要说明的是，如果第二终端设备将L_subCH,2指示给第一终端设备，则第二终端设备有能力根据

N_subCH和L_subCH,2得到K，进一步的，第二终端设备有能力根据

得到Q，此时第一终端设备不需要指示该参数Q。另外，如果Q的值是标准定义的值，或者配置在资源池上的值，则第一终端设备也不需要指示该参数Q。另外，如果第一终端设备已经将K指示给第二终端设备，则第二终端设备有能力根据

和K得到Q，此时第一终端设备也不需要指示该参数Q。The maximum indicative time unit length Q in the first information: The first terminal device indicates that this parameter can help the second terminal device to parse

The time domain information corresponding to the bit can also help the second terminal device to analyze

It should be noted that if the second terminal device indicates L _subCH,2 to the first terminal device, the second terminal device is capable of

N _subCH and L _subCH,2 get K, further, the second terminal device is capable of

In this case, the first terminal device does not need to indicate the parameter Q. In addition, if the value of Q is a value defined by the standard or a value configured on the resource pool, the first terminal device does not need to indicate the parameter Q. In addition, if the first terminal device has indicated K to the second terminal device, the second terminal device is capable of

And K to obtain Q, at this time the first terminal device does not need to indicate the parameter Q.

比特对应的时域信息，也可以帮助第二终端设备解析

比特对应的频域信息。The number of candidate single time unit resources K: The first terminal device indicates that this parameter can help the second terminal device to resolve

The time domain information corresponding to the bit can also help the second terminal device to analyze

The frequency domain information corresponding to the bit.

和Q得到K，此时第一终端设备不需要指示该参数K。另外，如果第一终端设备已经将L_subCH,2指示给第二终端设备，则第二终端设备根据

N_subCH和L_subCH,2有能力得到K，此时第一终端设备也不需要指示该参数K。It should be noted that if the first terminal device has indicated Q in the resource selection auxiliary information to the second terminal device, or the value of Q is a value defined by the standard, or the value of Q is a value configured in the resource pool, then the second terminal device is capable of

and Q to obtain K. In this case, the first terminal device does not need to indicate the parameter K. In addition, if the first terminal device has indicated L _subCH,2 to the second terminal device, the second terminal device can

N _subCH and L _subCH,2 are capable of obtaining K, and the first terminal device does not need to indicate the parameter K at this time.

特对应的时域信息，也可以帮助第二终端设备解析

比特对应的频域信息。需要说明的是，如果第二终端设备将L_subCH,2指示给第一终端设备，则第一终端设备不需要指示该参数L_subCH,2。另外，如果第一终端设备已经将第一时间窗的长度Y指示给第二终端设备，或者Y的值是标准定义的值，或者Y的值是配置在资源池的值，则第二终端设备有能力根据

和Y到K，进一步的，第二终端设备有能力根据

K和N_subCH得到L_subCH,2，此时第一终端设备不需要指示该参数L_subCH,2。另外，如果第一终端设备已经将K指示给第二终端设备，第二终端设备有能力根据

N_subCH和K得到L_subCH,2，此时第一终端设备也不需要指示该参数L_subCH,2。The first sub-channel number L _subCH,2 : The first terminal device indicates that this parameter can help the second terminal device to analyze

The corresponding time domain information can also help the second terminal device to analyze

bit corresponding to the frequency domain information. It should be noted that if the second terminal device indicates L _subCH,2 to the first terminal device, the first terminal device does not need to indicate the parameter L _subCH,2 . In addition, if the first terminal device has indicated the length Y of the first time window to the second terminal device, or the value of Y is a value defined by the standard, or the value of Y is a value configured in the resource pool, the second terminal device is capable of

and Y to K, further, the second terminal device is capable of

K and N _subCH are used to obtain L _subCH,2 . In this case, the first terminal device does not need to indicate the parameter L _subCH,2 . In addition, if the first terminal device has indicated K to the second terminal device, the second terminal device is capable of

N _subCH and K are used to obtain L _subCH,2 . In this case, the first terminal device does not need to indicate the parameter L _subCH,2 .

The interval between the time unit in which the first terminal device sends the first information and the smallest time unit among the Q time units is T: the first terminal device indicates that this parameter can help the second terminal device obtain the time domain position of the window corresponding to the resource selection auxiliary information. Optionally, if the standard defines T+P≤W, where W is a value defined by the standard, or a value configured on the resource pool, a method similar to the start and Length Indicator Value (SLIV) can be used to indicate T and P at the same time. In this case, the first terminal device does not need to indicate P separately to the second terminal device. The SLIV is a technology in the standard that indicates a starting OFDM symbol and the number of occupied OFDM symbols for the physical downlink shared channel (PDSCH) and the physical uplink shared channel (PUSCH) in a time slot of 14 OFDM symbols. Optionally, when the technology is used to indicate T and P, the parameter SLIV is generated according to T and P in the following manner: if T+P≤W/2, then SLIV＝W·(P-1)+T, otherwise, SLIV＝W·(W-P+1)+(W-P-T), where W/2<T+P≤W. The second terminal device can parse the SLIV value and obtain the values of T and P.

Based on the above scheme, with the resource selection auxiliary information (i.e., the first information) sent by the first terminal device to the second terminal device as the core, a method is proposed to use the time window scaling factor P to reduce the number of bits occupied by the first information when indicating the time domain information. This solves the problem in the prior art that the resource selection auxiliary information indicates limited available resources, and further improves the Mode2 (b) resource allocation mode.

In the embodiment shown in FIG. 11 , the action of the first terminal device or the second terminal device can be performed by the processor 501 in the communication device 50 shown in FIG. 10 calling the application code stored in the memory 503 to instruct the network device to execute.

It is understood that in the embodiment of the present application, the first terminal device or the second terminal device can perform some or all of the steps in the embodiment of the present application, and these steps are only examples. The embodiment of the present application can also perform other steps or variations of various steps. In addition, the various steps can be performed in different orders presented in the embodiment of the present application, and it is possible that not all the steps in the embodiment of the present application need to be performed.

In the various embodiments of the present application, unless otherwise specified or provided in a logical conflict, the terms and/or descriptions between the different embodiments are consistent and may be referenced to each other, and the technical features in the different embodiments may be combined to form new embodiments according to their inherent logical relationships.

It is understood that the various numbers involved in the embodiments of the present application are only for the convenience of description and are not used to limit the scope of the embodiments of the present application. The size of the sequence number of the above-mentioned processes does not mean the order of execution, and the execution order of each process should be determined by its function and internal logic.

It can be understood that in the above embodiments, the methods and/or steps implemented by the first terminal device can also be implemented by components (such as chips or circuits) that can be used for the first terminal device, and the methods and/or steps implemented by the second terminal device can also be implemented by components (such as chips or circuits) that can be used for the second terminal device.

The above mainly introduces the scheme provided by the embodiment of the present application from the perspective of interaction between various network elements. Accordingly, the embodiment of the present application also provides a communication device, which is used to implement the above various methods. The communication device can be the first terminal device in the above method embodiment, or a device including the above first terminal device, or a component that can be used for the first terminal device; or, the communication device can be the second terminal device in the above method embodiment, or a device including the above second terminal device, or a component that can be used for the second terminal device. It can be understood that in order to implement the above functions, the communication device includes a hardware structure and/or software module corresponding to each function. Those skilled in the art should easily realize that, in combination with the units and algorithm steps of each example described in the embodiments disclosed in this article, the present application can be implemented in the form of hardware or a combination of hardware and computer software. Whether a function is executed in the form of hardware or computer software driving hardware depends on the specific application and design constraints of the technical solution. Professional and technical personnel can use different methods to implement the described functions for each specific application, but such implementation should not be considered to exceed the scope of the present application.

The embodiment of the present application can divide the functional modules of the communication device according to the above method embodiment. For example, each functional module can be divided according to each function, or two or more functions can be integrated into one processing module. The above integrated module can be implemented in the form of hardware or in the form of software functional modules. It should be noted that the division of modules in the embodiment of the present application is schematic and is only a logical function division. There may be other division methods in actual implementation.

For example, the communication device is taken as the first terminal device in the above method embodiment. FIG14 shows a schematic diagram of the structure of a first terminal device 160. The first terminal device 160 includes a processing module 1601 and a transceiver module 1602. The transceiver module 1602, which may also be referred to as a transceiver unit, is used to implement the sending and/or receiving functions, and may be, for example, a transceiver circuit, a transceiver, a transceiver or a communication interface.

Among them, the transceiver module 1602 may include a receiving module and a sending module, which are respectively used to execute the receiving and sending steps performed by the first terminal device in the above method embodiment, and the processing module 1601 may be used to execute other steps except the receiving and sending steps performed by the first terminal device in the above method embodiment.

Exemplarily, the processing module 1601 is used to determine a first time unit in a first selection window;

The transceiver module 1602 is used to send first information to the second terminal device in the first time unit, where the first information is used to assist the second terminal device in resource selection, and the first information indicates K candidate single time unit resources, where K is a positive integer, and the K candidate single time unit resources belong to Q time units in the time domain, and the Q time units belong to the first selection window. The smallest time unit among the Q time units is the Nth time unit after the first time unit, and the absolute value of the difference between any two adjacent time units among the Q time units is P time units, where P is an integer greater than 1, and N is a positive integer.

Optionally, the transceiver module 1602 is also used to obtain the first selection window information, which includes at least two of the start time unit of the first selection window, the length of the first selection window, and the end time unit of the first selection window; the processing module 1601 determines the first selection window based on the first selection window information.

Optionally, the transceiver module 1602 is specifically used to receive the first selection window information from the second terminal device. Optionally, the transceiver module 1602 is used to send the first information to the second terminal device, including: the transceiver module 1602 is used to send the second level sidelink control information SCI to the second terminal device, the second level SCI includes the first information; or, the transceiver module 1602 is used to send the media access control layer control element MAC CE to the second terminal device, the MAC CE includes the first information; or, the transceiver module 1602 is used to send the radio resource control RRC signaling to the second terminal device, the RRC signaling includes the first information.

Optionally, the transceiver module 1602 is also used to send second information to the second terminal device, and the second information includes one or more of the following: P, Q, the number of first sub-channels, the time unit interval, or the number of candidate single time unit resources indicated by the first information, wherein the time unit interval is the interval between the time unit for sending the first information and the smallest time unit among the Q time units.

Among them, all relevant contents of each step involved in the above method embodiment can be referred to the functional description of the corresponding functional module, and will not be repeated here.

In this embodiment, the first terminal device 160 is presented in the form of dividing various functional modules in an integrated manner. Here, the "module" may refer to a specific ASIC, a circuit, a processor and a memory that executes one or more software or firmware programs, an integrated logic circuit, and/or other devices that can provide the above functions. In a simple embodiment, those skilled in the art can imagine that the first terminal device 160 can take the form of a communication device 50 shown in Figure 10.

For example, the processor 501 in the communication device 50 shown in FIG. 10 may call the computer execution instructions stored in the memory 503 to enable the communication device 50 to execute the resource indication information transmission method in the above method embodiment.

Specifically, the functions/implementation processes of the processing module 1601 and the transceiver module 1602 in FIG14 can be implemented by the processor 501 in the communication device 50 shown in FIG10 calling the computer execution instructions stored in the memory 503. Alternatively, the functions/implementation processes of the processing module 1601 in FIG14 can be implemented by the processor 501 in the communication device 50 shown in FIG10 calling the computer execution instructions stored in the memory 503, and the functions/implementation processes of the transceiver module 1602 in FIG14 can be implemented by the communication interface 504 in the communication device 50 shown in FIG10.

Since the first terminal device 160 provided in this embodiment can execute the above-mentioned method for transmitting resource indication information, the technical effects that can be obtained can refer to the above-mentioned method embodiments and will not be repeated here.

Or, for example, the communication device is taken as the second terminal device in the above method embodiment. FIG. 15 shows a schematic diagram of the structure of a second terminal device 170. The second terminal device 170 includes a processing module 1701 and a transceiver module 1702. The transceiver module 1702, which may also be referred to as a transceiver unit, is used to implement the sending and/or receiving functions, and may be, for example, a transceiver circuit, a transceiver, a transceiver or a communication interface.

Among them, the transceiver module 1702 may include a receiving module and a sending module, which are respectively used to execute the receiving and sending steps performed by the second terminal device in the above method embodiment, and the processing module 1701 may be used to execute other steps except the receiving and sending steps performed by the second terminal device in the above method embodiment.

Exemplarily, the transceiver module 1702 is used to receive first information from the first terminal device in the first time unit, the first information is used to assist the second terminal device in resource selection, the first information indicates K candidate single time unit resources, wherein K is a positive integer, the K candidate single time unit resources belong to Q time units in the time domain, the Q time units belong to the first selection window, the smallest time unit among the Q time units is located at the Nth time unit after the first time unit, and the absolute value of the difference between any two adjacent time units among the Q time units is P time units, P is an integer greater than 1, and N is a positive integer;

The processing module 1701 is used to determine a first time-frequency resource according to the first information.

Optionally, processing module 1701 is used to determine the first time-frequency resource based on the first information, including: processing module 1701 is used to determine the first time-frequency resource based on the first information and a first candidate single time unit resource set, the first candidate single time unit resource set being a candidate single time unit resource set determined by the second terminal device.

Optionally, processing module 1701 is used to determine the first time-frequency resource based on the first information, including: processing module 1701 is used to determine part or all of K candidate single time unit resources indicated by the first information as the first time-frequency resources.

Optionally, the transceiver module 1702 is used to receive the first information from the first terminal device, including: the transceiver module 1702 is used to receive the second-level sidelink control information SCI from the first terminal device, the second-level SCI including the first information; or, the transceiver module 1702 is used to receive the media access control layer control element MACCE from the first terminal device, the MAC CE including the first information; or, the transceiver module 1702 is used to receive the radio resource control RRC signaling from the first terminal device, the RRC signaling including the first information.

Optionally, the transceiver module 1702 is also used to receive second information from the first terminal device, and the second information includes one or more of the following: P, Q, the number of first sub-channels, the time unit interval, or the number of candidate single time unit resources indicated by the first information, wherein the time unit interval is the number of time units between the time unit for sending the first information and the smallest time unit among the Q time units, that is, N-1; the processing module 1701 is also used to parse the first information based on the second information.

Among them, all relevant contents of each step involved in the above method embodiment can be referred to the functional description of the corresponding functional module, and will not be repeated here.

In this embodiment, the second terminal device 170 is presented in the form of dividing each functional module in an integrated manner. Here, the "module" may refer to a specific ASIC, circuit, processor and memory that executes one or more software or firmware programs, integrated logic circuit, and/or other devices that can provide the above functions. In a simple embodiment, those skilled in the art can imagine that the second terminal device 170 can take the form of the communication device 50 shown in Figure 10.

For example, the processor 501 in the communication device 50 shown in FIG. 10 may call the computer execution instructions stored in the memory 503 to enable the communication device 50 to execute the resource indication information transmission method in the above method embodiment.

Specifically, the functions/implementation processes of the processing module 1701 and the transceiver module 1702 in FIG15 can be implemented by the processor 501 in the communication device 50 shown in FIG10 calling the computer execution instructions stored in the memory 503. Alternatively, the functions/implementation processes of the processing module 1701 in FIG15 can be implemented by the processor 501 in the communication device 50 shown in FIG10 calling the computer execution instructions stored in the memory 503, and the functions/implementation processes of the transceiver module 1702 in FIG15 can be implemented by the communication interface 504 in the communication device 50 shown in FIG10.

Since the second terminal device 170 provided in this embodiment can execute the above-mentioned method for transmitting resource indication information, the technical effects that can be obtained can refer to the above-mentioned method embodiment and will not be repeated here.

Optionally, the first terminal device in the embodiment of the present application may include a roadside unit, which can be used to implement the actions performed by the first terminal device in the above embodiment.

Optionally, the second terminal device in the embodiment of the present application may include a roadside unit, which can be used to implement the actions performed by the second terminal device in the above embodiment.

Optionally, an embodiment of the present application further provides a communication device (for example, the communication device may be a chip or a chip system), the communication device including a processor for implementing the method in any of the above method embodiments. In one possible design, the communication device also includes a memory. The memory is used to store necessary program instructions and data, and the processor can call the program code stored in the memory to instruct the communication device to execute the method in any of the above method embodiments. Of course, the memory may not be in the communication device. In another possible design, the communication device also includes an interface circuit, which is a code/data read/write interface circuit, which is used to receive computer instructions (computer instructions are stored in the memory, may be read directly from the memory, or may pass through other devices) and transmit them to the processor. When the communication device is a chip system, it can be composed of a chip, or it can include a chip and other discrete devices, which is not specifically limited in the embodiment of the present application.

In addition, the present application also provides a computer-readable storage medium, which stores computer instructions. When the computer instructions are executed on a computer, the operations and/or processes performed by the first terminal device or the second terminal device in each method embodiment of the present application are executed.

The present application also provides a computer program product, which includes computer program code or instructions. When the computer program code or instructions are run on a computer, the operations and/or processes performed by the first terminal device or the second terminal device in the various method embodiments of the present application are executed.

In addition, the present application also provides a communication system, including a first terminal device and a second terminal device in an embodiment of the present application.

In the above embodiments, it can be implemented in whole or in part by software, hardware, firmware or any combination thereof. When implemented using a software program, it can be implemented in whole or in part in the form of a computer program product. The computer program product includes one or more computer instructions. When the computer program instructions are loaded and executed on a computer, the process or function described in the embodiment of the present application is generated in whole or in part. The computer may be a general-purpose computer, a special-purpose computer, a computer network, or other programmable device. The computer instructions may be stored in a computer-readable storage medium, or transmitted from one computer-readable storage medium to another computer-readable storage medium, for example, the computer instructions may be transmitted from a website site, computer, server or data center by wired (e.g., coaxial cable, optical fiber, digital subscriber line (digital subscriber line, DSL)) or wireless (e.g., infrared, wireless, microwave, etc.) mode to another website site, computer, server or data center. The computer-readable storage medium may be any available medium that a computer can access or may include one or more servers, data centers and other data storage devices that can be integrated with the medium. The available medium may be a magnetic medium (eg, a floppy disk, a hard disk, a magnetic tape), an optical medium (eg, a DVD), or a semiconductor medium (eg, a solid state disk (SSD)), etc. In the embodiment of the present application, the computer may include the aforementioned device.

Although the present application is described herein in conjunction with various embodiments, in the process of implementing the claimed application, those skilled in the art may understand and implement other variations of the disclosed embodiments by viewing the drawings, the disclosure, and the appended claims. In the claims, the word "comprising" does not exclude other components or steps, and "one" or "an" does not exclude multiple situations. A single processor or other unit may implement several functions listed in the claims. Certain measures are recorded in different dependent claims, but this does not mean that these measures cannot be combined to produce good results.

Although the present application has been described in conjunction with specific features and embodiments thereof, it is obvious that various modifications and combinations may be made thereto without departing from the spirit and scope of the present application. Accordingly, this specification and the drawings are merely exemplary illustrations of the present application as defined by the appended claims, and are deemed to have covered any and all modifications, variations, combinations or equivalents within the scope of the present application. Obviously, those skilled in the art may make various modifications and variations to the present application without departing from the spirit and scope of the present application. Thus, if these modifications and variations of the present application fall within the scope of the claims of the present application and their equivalents, the present application is also intended to include these modifications and variations.

Claims (48)

1. A method for transmitting resource indication information, comprising: determining a first time unit in a first selection window; A first information is sent to a second terminal device in the first time unit, where the first information is used to assist the second terminal device in resource selection, and the first information indicates K candidate single time unit resources, where K is a positive integer, and the K candidate single time unit resources belong to Q time units in the time domain, and the Q time units belong to the first selection window. The smallest time unit among the Q time units is the Nth time unit after the first time unit, and the absolute value of the difference between any two adjacent time units among the Q time units is P time units, where P is an integer greater than 1, and N is a positive integer. 2. The method according to claim 1, characterized in that the smallest time unit among the Q time units is Q ₁ , the largest time unit in the first selection window is T _end , Among them, Q, T _end , P and Q ₁ satisfy

It means round down, Q is a positive integer. 3. The method according to claim 1 or 2, characterized in that the method further comprises: Acquire the first selection window information, where the first selection window information includes at least two of a start time unit of the first selection window, a length of the first selection window, and an end time unit of the first selection window; The first selection window is determined according to the first selection window information. 4. The method according to claim 3, wherein obtaining the first selection window information comprises: The first selection window information is received from the second terminal device. 5. The method according to any one of claims 1-5, characterized in that the P is obtained from the second terminal, or the P is obtained from a network device, or the P is preconfigured. 6. The method according to any one of claims 1 to 5, characterized in that the method further comprises: Send second information, wherein the second information includes the P. 7. The method according to any one of claims 1-6 is characterized in that the first information is indicated by M bits, and the M is determined by the Q time units, the first number of sub-channels and the total number of sub-channels included in the first resource pool, and the first number of sub-channels is the number of sub-channels occupied by each resource in the K candidate single time unit resources. 8. The method according to claim 7, characterized in that the M, the Q, the first number of sub-channels and the total number of sub-channels included in the first resource pool satisfy the following formula:

Wherein, N _subCH is the total number of sub-channels included in the first resource pool, L _subCH,2 is the number of the first sub-channels,

Indicates rounding up; The first information is indicated by M bits, specifically: The first of the M bits

bits are used to indicate the time domain information of the K candidate single time unit resources, and the latter

bits are used to indicate the frequency domain information of the K candidate single time unit resources. 9. The method according to claim 7, characterized in that the M, the Q, the first number of sub-channels and the total number of sub-channels included in the first resource pool satisfy the following formula:

Wherein, N _subCH is the total number of sub-channels included in the first resource pool, L _subCH,2 is the number of the first sub-channels,

Indicates rounding up; The first information is indicated by M bits, specifically: The first of the M bits

bits are used to indicate the time domain information of the K candidate single time unit resources, and the latter

bits are used to indicate the frequency domain information of the K candidate single time unit resources. 10. The method according to claim 7, wherein the M, the Q, the first number of sub-channels, and the total number of sub-channels in the first resource pool satisfy the following first formula: M＝Q*(N _subCH -L _{subCH, 2} +1) Wherein, N _subCH is the total number of sub-channels in the first resource pool, and L _subCH,2 is the number of the first sub-channels; The first information is indicated by M bits, including: The M bits constitute a bitmap, and for every N _subCH -L _{subCH, 2} +1 bits in the bitmap indicate the availability of each candidate single time unit resource on one time unit among the Q time units. 11. The method according to any one of claims 1 to 10, characterized in that N is configured, preconfigured, or predefined by the network device. 12. The method according to any one of claims 1 to 11 is characterized in that the first information is carried in the second-level sidelink control information SCI or the media access control layer control element MAC CE, or the radio resource control RRC signaling. 13. A method for transmitting resource indication information, comprising: receiving first information from a first terminal device in the first time unit, the first information being used to assist a second terminal device in selecting a resource, the first information indicating K candidate single time unit resources, wherein K is a positive integer, the K candidate single time unit resources belong to Q time units in the time domain, the Q time units belong to the first selection window, the smallest time unit among the Q time units is located at the Nth time unit after the first time unit, the absolute value of a difference between any two adjacent time units among the Q time units is P time units, P is an integer greater than 1, and N is a positive integer greater than or equal to 1; Determine a first time-frequency resource according to the first information. 14. The method according to claim 13, characterized in that The smallest time unit among the Q time units is Q ₁ , the largest time unit in the first selection window is T _end , Among them, Q, T _end , P and Q ₁ satisfy

It means round down, Q is a positive integer. 15. The method according to claim 13 or 14, characterized in that the P is obtained from the second terminal, or the P is obtained from a network device, or the P is preconfigured. 16. The method according to any one of claims 13 to 15, characterized in that the method further comprises: Send second information, wherein the second information includes the P. 17. The method according to any one of claims 13-16 is characterized in that the first information is indicated by M bits, and the M is determined by the Q time units, the first number of sub-channels and the total number of sub-channels included in the first resource pool, and the first number of sub-channels is the number of sub-channels occupied by each resource in the K candidate single time unit resources. 18. The method according to claim 17, wherein the M, the Q time units, the first number of sub-channels, and the total number of sub-channels included in the first resource pool satisfy the following formula:

Wherein, N _subCH is the total number of sub-channels included in the first resource pool, L _subCH,2 is the number of the first sub-channels,

Indicates rounding up; The first information is indicated by M bits, specifically: The first of the M bits

bits are used to indicate the time domain information of the K candidate single time unit resources, and the latter

bits are used to indicate the frequency domain information of the K candidate single time unit resources. 19. The method according to claim 17, wherein the M, the Q time units, the number of the first sub-channels, and the total number of sub-channels included in the first resource pool satisfy the following formula:

Wherein, N _subCH is the total number of sub-channels included in the first resource pool, L _subCH,2 is the number of the first sub-channels,

Indicates rounding up; The first information is indicated by M bits, specifically: The first of the M bits

bits are used to indicate the time domain information of the K candidate single time unit resources, and the latter

bits are used to indicate the frequency domain information of the K candidate single time unit resources. 20. The method according to claim 17, wherein the M, the Q, the first number of sub-channels, and the total number of sub-channels in the first resource pool satisfy the following first formula: M＝Q*(N _subCH -L _{subCH, 2} +1) Wherein, N _subCH is the total number of sub-channels in the first resource pool, and L _subCH,2 is the number of the first sub-channels; The first information is indicated by M bits, including: The M bits constitute a bitmap, and for every N _subCH -L _{subCH, 2} +1 bits in the bitmap indicate the availability of each candidate single time unit resource on one time unit among the Q time units. 21. The method according to any one of claims 13 to 20, characterized in that N is configured, preconfigured, or predefined by the network device. 22. The method according to any one of claims 13 to 21 is characterized in that the first information is carried in the second-level sidelink control information SCI or the media access control layer control element MAC CE, or the radio resource control RRC signaling. 23. A communication device, comprising: a processing module and a transceiver module; The processing module is used to determine a first time unit in a first selection window; The transceiver module is used to send first information to the second terminal device in the first time unit, the first information is used to assist the second terminal device in resource selection, the first information indicates K candidate single time unit resources, wherein K is a positive integer, the K candidate single time unit resources belong to Q time units in the time domain, the Q time units belong to the first selection window, the smallest time unit among the Q time units is the Nth time unit after the first time unit, and the absolute value of the difference between any two adjacent time units among the Q time units is P time units, P is an integer greater than 1, and N is a positive integer. 24. The device according to claim 23, wherein the smallest time unit among the Q time units is Q ₁ , the largest time unit in the first selection window is T _end , Among them, Q, T _end , P and Q ₁ satisfy

It means round down, Q is a positive integer. 25. The device according to claim 23 or 24, characterized in that The transceiver module is further used to obtain the first selection window information, where the first selection window information includes at least two of a start time unit of the first selection window, a length of the first selection window, and an end time unit of the first selection window; The processing module determines the first selection window according to the first selection window information. 26. The apparatus according to claim 25, wherein the transceiver unit is specifically configured to receive the first selection window information from the second terminal device. 27. The apparatus according to any one of claims 23-26, characterized in that the P is obtained from the second terminal, or the P is obtained from a network device, or the P is preconfigured. 28. The device according to any one of claims 23-27, characterized in that the transceiver module is also used to send second information, and the second information includes the P. 29. An apparatus according to any one of claims 23-28, characterized in that the first information is indicated by M bits, wherein M is determined by the Q time units, the first number of sub-channels and the total number of sub-channels included in the first resource pool, and the first number of sub-channels is the number of sub-channels occupied by each resource in the K candidate single time unit resources. 30. The apparatus according to claim 29, wherein the M, the Q time units, the number of the first sub-channels, and the total number of sub-channels included in the first resource pool satisfy the following formula:

Wherein, N _subCH is the total number of sub-channels included in the first resource pool, L _subCH,2 is the number of the first sub-channels,

Indicates rounding up; The first information is indicated by M bits, specifically: The first of the M bits

bits are used to indicate the time domain information of the K candidate single time unit resources, and the latter

bits are used to indicate the frequency domain information of the K candidate single time unit resources. 31. The apparatus according to claim 29, wherein the M, the Q time units, the number of the first sub-channels, and the total number of sub-channels included in the first resource pool satisfy the following formula:

Wherein, N _subCH is the total number of sub-channels included in the first resource pool, L _subCH,2 is the number of the first sub-channels,

Indicates rounding up; The first information is indicated by M bits, specifically: The first of the M bits

bits are used to indicate the time domain information of the K candidate single time unit resources, and the latter

bits are used to indicate the frequency domain information of the K candidate single time unit resources. 32. The apparatus according to claim 29, wherein the M, the Q, the first number of sub-channels, and the total number of sub-channels in the first resource pool satisfy the following first formula: M＝Q*(N _subCH -L _{subCH, 2} +1) Wherein, N _subCH is the total number of sub-channels in the first resource pool, and L _subCH,2 is the number of the first sub-channels; The first information is indicated by M bits, including: The M bits constitute a bitmap, and for every N _subCH -L _{subCH, 2} +1 bits in the bitmap indicate the availability of each candidate single time unit resource on one time unit among the Q time units. 33. The apparatus according to any one of claims 23-32, wherein N is configured or pre-configured by a network device. 34. The device according to any one of claims 23-33 is characterized in that the first information is carried in the second-level sidelink control information SCI or the media access control layer control element MAC CE, or the radio resource control RRC signaling. 35. A communication device, comprising: a processing module and a transceiver module; The transceiver module is used to receive first information from the first terminal device in the first time unit, the first information is used to assist the second terminal device in resource selection, the first information indicates K candidate single time unit resources, wherein K is a positive integer, the K candidate single time unit resources belong to Q time units in the time domain, the Q time units belong to the first selection window, the smallest time unit among the Q time units is located at the Nth time unit after the first time unit, the absolute value of the difference between any two adjacent time units among the Q time units is P time units, P is an integer greater than 1 and N is a positive integer; The processing module is used to determine the first time-frequency resource according to the first information. 36. The device according to claim 35, wherein the smallest time unit among the Q time units is Q ₁ , the largest time unit in the first selection window is T _end , Among them, Q, T _end , P and Q ₁ satisfy

It means round down, Q is a positive integer. 37. The device according to claim 35 or 36, characterized in that N is configured by the network device or pre-configured. 38. An apparatus according to any one of claims 35-37, characterized in that the first information is indicated by M bits, wherein M is determined by the Q time units, the first number of sub-channels and the total number of sub-channels included in the first resource pool, and the first number of sub-channels is the number of sub-channels occupied by each resource in the K candidate single time unit resources. 39. The apparatus according to claim 38, wherein the M, the Q time units, the first number of sub-channels, and the total number of sub-channels included in the first resource pool satisfy the following formula:

Wherein, N _subCH is the total number of sub-channels included in the first resource pool, L _subCH,2 is the number of the first sub-channels,

Indicates rounding up; The first information is indicated by M bits, specifically: The first of the M bits

bits are used to indicate the time domain information of the K candidate single time unit resources, and the latter

bits are used to indicate the frequency domain information of the K candidate single time unit resources. 40. The apparatus according to claim 38, wherein the M, the Q time units, the number of the first sub-channels, and the total number of sub-channels included in the first resource pool satisfy the following formula:

Wherein, N _subCH is the total number of sub-channels included in the first resource pool, L _subCH,2 is the number of the first sub-channels,

Indicates rounding up; The first information is indicated by M bits, specifically: The first of the M bits

bits are used to indicate the time domain information of the K candidate single time unit resources, and the latter

bits are used to indicate the frequency domain information of the K candidate single time unit resources. 41. The apparatus according to claim 38, wherein the M, the Q, the first number of sub-channels, and the total number of sub-channels in the first resource pool satisfy the following first formula: M＝Q*(N _subCH -L _{subCH, 2} +1) Wherein, N _subCH is the total number of sub-channels in the first resource pool, and L _subCH,2 is the number of the first sub-channels; The first information is indicated by M bits, including: The M bits constitute a bitmap, and for every N _subCH -L _{subCH, 2} +1 bits in the bitmap indicate the availability of each candidate single time unit resource on one time unit among the Q time units. 42. The apparatus according to any one of claims 35-41, characterized in that the P is obtained from the second terminal, or the P is obtained from a network device, or the P is preconfigured. 43. The device according to any one of claims 35-42 is characterized in that the transceiver module is also used to receive second information, and the second information includes the P. 44. The device according to any one of claims 35-43 is characterized in that the first information is carried in the second-level sidelink control information SCI or the media access control layer control element MAC CE, or the radio resource control RRC signaling. 45. A communication device, characterized in that the communication device comprises at least one processor and at least one memory, the at least one memory is used to store computer programs or instructions, and the at least one processor is used to execute the computer program or instructions in the memory, so that the method described in any one of claims 1 to 12 is executed, or the method described in any one of claims 13 to 22 is executed. 46. A computer-readable storage medium, characterized in that computer instructions are stored in the computer-readable storage medium, and when the computer instructions are executed on a computer, the method as described in any one of claims 1 to 12 is executed, or the method as described in any one of claims 13 to 22 is executed. 47. A computer program product, characterized in that the computer program product comprises computer program code, and when the computer program code runs on a computer, the method as claimed in any one of claims 1 to 12 is executed, or the method as claimed in any one of claims 13 to 22 is executed. 48. A chip, characterized in that the chip comprises a processor, and the processor is used to execute a computer program stored in a memory, so that the method described in any one of claims 1 to 12 is executed, or the method described in any one of claims 13 to 22 is executed.

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