WO2024169604A1

WO2024169604A1 - Communication method and apparatus

Info

Publication number: WO2024169604A1
Application number: PCT/CN2024/074760
Authority: WO
Inventors: 黄海宁; 杨帆; 张天虹; 李君瑶
Original assignee: 华为技术有限公司
Priority date: 2023-02-17
Filing date: 2024-01-30
Publication date: 2024-08-22
Also published as: CN118540794A

Abstract

Provided in the present application are a communication method and apparatus. The method comprises: determining first frequency-domain resources; and sending sidelink control information on the first frequency-domain resources, wherein the number of resources other than a guard band PRB in a sub-channel i is less than a first threshold value, or the proportion of resources other than the guard band PRB in the sub-channel i is less than a second threshold value, or a code rate corresponding to resources other than the guard band PRB in the sub-channel i is greater than a third threshold value, the first frequency-domain resources are frequency-domain resources in a sub-channel i+1, or the first frequency-domain resources comprise some frequency-domain resources in the sub-channel i and some or all of the frequency-domain resources in the sub-channel i+1; or the number of resources other than the guard band PRB in the sub-channel i is greater than or equal to the first threshold value, or the proportion of resources other than the guard band PRB in the sub-channel i is greater than or equal to the second threshold value, or the code rate corresponding to the resources other than the guard band PRB in the sub-channel i is less than or equal to the third threshold value, and the first frequency-domain resources are frequency-domain resources in the sub-channel i.

Description

Communication method and device

This application claims priority to the Chinese patent application filed with the State Intellectual Property Office on February 17, 2023, with application number 202310176300.4 and application name “Communication Method and Device”, all contents of which are incorporated by reference in this application.

Technical Field

The present application relates to the field of communications, and in particular to a communication method and device.

Background Art

At present, sidelink (SL) transmission can be performed on unlicensed spectrum, and the terminal can perform the channel access process on the resources of the unlicensed spectrum. For example, the terminal can perform listen before talk (LBT) to access the channel. Specifically, during the execution of LBT, the terminal performs channel detection to determine whether the channel is idle for a period of time. When it is detected that the channel is idle for a period of time, it means that LBT is successful and the terminal can access the channel. After the terminal accesses the channel, it can occupy the resources of the unlicensed spectrum for sidelink communication.

In order to prevent spectrum leakage from causing adjacent channel interference, a guard band can be introduced between adjacent channels. The introduction of the guard band affects the resources that can be used to transmit SL information, thereby affecting the communication performance of the terminal.

Summary of the invention

The embodiments of the present application provide a communication method and apparatus that can improve the communication performance of a device.

In order to achieve the above purpose, this application adopts the following technical solutions:

In a first aspect, the technical solution of the present application provides a communication method, which can be applicable to a first device. The first device can be an independent device, or a module, chip, device, etc. in the device. The method described includes: the first device determines a first frequency domain resource and sends side control information on the first frequency domain resource.

Among them, if the number of resource blocks other than the guard band physical resource block PRB in subchannel i is less than the first threshold, or the proportion of resource blocks other than the guard band PRB in subchannel i in all resource blocks included in subchannel i is less than the second threshold, or the code rate of the side control information corresponding to the resources other than the guard band PRB in subchannel i is greater than the third threshold, then the first frequency domain resources are the frequency domain resources in subchannel i+1, or the first frequency domain resources include part of the frequency domain resources in subchannel i and part or all of the frequency domain resources in subchannel i+1;

Alternatively, if the number of resource blocks other than the guard band PRB in the subchannel i is greater than or equal to the first threshold, or the proportion of resource blocks other than the guard band PRB on the subchannel i in all resource blocks included in the subchannel i is greater than or equal to the second threshold, or the code rate of the side control information corresponding to the resources other than the guard band PRB on the subchannel i is less than or equal to the third threshold, then the first frequency domain resource is the frequency domain resource on the subchannel i;

The subchannel i and the subchannel i+1 are subchannels in a first subchannel set, and the first subchannel set is a subchannel occupied by the sideline data information associated with the sideline control information; the i is an integer greater than or equal to 0.

Compared with the related art that defaults to sending PSCCH in the lowest subchannel occupied by PSSCH, in the method of the embodiment of the present application, the first device can flexibly determine to transmit PSCCH in subchannel i and/or subchannel i+1 according to conditions, thereby improving communication flexibility, and can ensure the number of resources used to transmit PSCCH as much as possible, thereby improving the transmission reliability of PSCCH and thus improving the success rate of data decoding. The communication performance of the first device is relatively high.

In one possible design, the method further includes:

The first device performs a listen-before-talk (LBT) process to obtain a first channel occupancy time (COT), and the frequency domain resources corresponding to the first COT include the first frequency domain resources.

Optionally, the first device performs a listen-before-talk (LBT) process in an unlicensed spectrum.

In a possible design, the resources included in the first sub-channel set are resources in an unlicensed spectrum. Alternatively, it can be understood that the resources included in the first sub-channel set are resources in an unlicensed spectrum.

In one possible design, the subchannel i is the subchannel with the lowest index in the first subchannel set. Exemplarily, when the number of PRBs included in the guard band is less than or equal to the number of PRBs included in a subchannel, the subchannel i is the subchannel with the lowest index in the first subchannel set.

Compared with the PSCCH occupying the lowest subchannel where the PSSCH is located by default in the related art, the first device can flexibly determine that the subchannel used to carry the PSCCH is the lowest subchannel where the PSSCH is located, or the second lowest subchannel where the PSSCH is located, or occupies the PSSCH. The lowest subchannel where the QoS channel is located and the second lowest subchannel where the PSSCH is located can meet different performance requirements and are applicable to more scenarios.

In one possible design, the subchannel i is the subchannel with the second lowest index in the first subchannel set. Exemplarily, when the number of PRBs included in the guard band is greater than the number of PRBs included in a subchannel, the subchannel i is the subchannel with the lowest index in the first subchannel set.

In one possible design, the first frequency domain resource is a frequency domain resource in the subchannel i;

The starting position of the first frequency domain resource is the PRB with the smallest index excluding the guard band PRB in the subchannel i;

The end position of the first frequency domain resource is the PRB with a smaller index in the first PRB and the second PRB, the first PRB is the PRB with the largest index in the subchannel i, and the second PRB is a PRB determined based on the starting position of the first frequency domain resource and the number of resources of the side control information.

This implementation eliminates the influence of the guard band PRB and can ensure that the PRB in the guard band is not used to transmit the PSCCH, thereby preventing the number of available PRBs for carrying the PSCCH from being reduced.

The starting position of the first frequency domain resource is the PRB with the smallest index in the sub-channel i excluding the guard band PRB.

Optionally, the end position of the first frequency domain resource is determined according to the start position of the first frequency domain resource and the resource quantity of the sideline control information. In this way, it can be ensured that the number of PRBs used to carry PSCCH is not less than the resource configuration quantity, thereby improving the transmission performance of PSCCH.

Or, optionally, the end position of the first frequency domain resource is the PRB with the largest index in the subchannel i. In this way, the number of PRBs used to carry the PSCCH can be increased as much as possible, thereby improving the transmission performance of the PSCCH.

In one possible design, the first frequency domain resources include part of the frequency domain resources in the subchannel i and part or all of the frequency domain resources in the subchannel i+1;

The end position of the first frequency domain resource is the PRB with a smaller index in the first PRB and the second PRB, the first PRB is the PRB with the largest index in the subchannel i+1, and the second PRB is a PRB determined based on the starting position of the first frequency domain resource and the number of resources of the side control information.

In this way, the number of PRBs used to carry PSCCH can be increased as much as possible, thereby improving the transmission performance of PSCCH.

The end position of the first frequency domain resource is determined according to the start position of the first frequency domain resource and the resource quantity of the sidelink control information, or the end position of the first frequency domain resource is the PRB with the largest index in the subchannel i+1.

In one possible design, the first frequency domain resource is a frequency domain resource in the sub-channel i+1, and a starting position of the first frequency domain resource is a PRB with a smallest index in the sub-channel i+1.

In this way, the first device only sends PSCCH on the frequency domain resources in subchannel i+1, and does not send PSCCH on subchannel i. PRBs other than the guard band PRB on subchannel i can be used to transmit other information to improve the utilization rate of this part of resources.

In one possible design, the method further includes:

Send indication information, where the indication information is used to indicate whether the sidelink data information occupies a subchannel including a guard band PRB.

In this way, it is possible to avoid missing the detection of the PSSCH due to the receiving end blindly detecting the subchannel of the PSCCH as the lowest index subchannel occupied by the PSSCH, thereby improving the probability of successful decoding of the PSSCH.

In addition, since some devices use sub-channels including guard band PRBs to transmit PSSCH, and some devices do not use sub-channels including guard band PRBs to transmit PSSCH, by having the device send indication information to indicate whether it uses the guard band PRBs, the transceiver and the receiver can have a consistent understanding of the receiving location of the data information and can reduce the probability of resource conflicts between devices.

In one possible design, the index of the subchannel including the guard band PRB is not higher than the index of the subchannel carrying the sidelink control information.

In a second aspect, the technical solution of the present application provides a communication method, which can be applicable to a second device. The second device can be an independent device, or a module, chip, device, etc. in the device. The method described includes: receiving side control information on the first frequency domain resource, and decoding side data information according to the side control information.

In one possible design, resources included in the first sub-channel set are resources in an unlicensed spectrum.

In one possible design, the subchannel i is the subchannel with the lowest or second lowest index in the first subchannel set.

The end position of the first frequency domain resource is determined according to the start position of the first frequency domain resource and the resource quantity of the sidelink control information, or the end position of the first frequency domain resource is the PRB with the largest index in the subchannel i.

In one possible design, the method further includes:

Indication information is received, where the indication information is used to indicate whether the sidelink data information occupies a subchannel including a guard band PRB.

According to a third aspect, a communication method is provided, which can be applied to a first device. The first device can be an independent device, or a module, chip, apparatus, etc. in the device. The method includes: the first device determines a first frequency domain resource, and sends the sidelink control information on the first frequency domain resource; the starting position of the first frequency domain resource is the PRB with the lowest index in the first subchannel set except the guard band physical resource block PRB; the first subchannel set is the subchannel occupied by the sidelink data information associated with the sidelink control information.

In this way, PSCCH can be mapped starting from the PRB with the lowest index excluding the guard band PRB in subchannel i according to the resource configuration quantity. On the one hand, it can ensure that the number of PRBs used to carry PSCCH is not less than the resource configuration quantity. On the other hand, it can make full use of the PRB resources in subchannel i as much as possible to improve resource utilization.

In one possible design, the first frequency domain resources include X PRBs.

Optionally, X is the number of resources for the sideline control information, and X is configured, preconfigured, or predefined by a network device. X is a positive integer. In this way, it is possible to ensure that the number of PRBs used to carry the PSCCH is sufficient, thereby ensuring the transmission performance of the PSCCH.

Optionally, X may be greater than the number of resources for the sideline control information. Optionally, the mapping end point of the PSCCH is the PRB with the largest index in subchannel i or the PRB with the largest index in subchannel i+1. In this way, the number of PRBs used to carry the PSCCH can be increased as much as possible, thereby improving the transmission performance of the PSCCH.

In one possible design, the X PRBs are frequency domain resources in subchannel i, or the X PRBs include part of the frequency domain resources in subchannel i and part or all of the frequency domain resources in subchannel i+1, and the subchannel i and the subchannel i+1 are subchannels in the first subchannel set.

Optionally, the subchannel i is the subchannel with the lowest index in the first subchannel set.

Or, optionally, the subchannel i is the subchannel with the second lowest index in the first subchannel set.

In one possible design, the method further includes:

Execute a channel access process to obtain a first channel;

The first set of subchannels is determined in the first channel.

In a fourth aspect, the technical solution of the present application provides a communication method, which can be applied to a second device, which can be an independent device, or a module, chip, device, etc. in the device, wherein the method comprises: receiving sideline control information on the first frequency domain resource, and decoding sideline data information according to the sideline control information. The starting position of the first frequency domain resource is the PRB with the lowest index in the first subchannel set except the guard band physical resource block PRB; the first subchannel set is the subchannel occupied by the sideline data information associated with the sideline control information.

In a possible design, the number of PRBs included in the first frequency domain resources is X, where X is the number of resources for the sideline control information, and X is configured or preconfigured or predefined by a network device. X is a positive integer.

The subchannel i is the subchannel with the lowest or second lowest index in the first subchannel set.

In a fifth aspect, a communication method is provided, which can be applicable to a first device. The first device can be an independent device, or a module, chip, device, etc. in the device. The method includes: the first device determines a first frequency domain resource and sends side control information on the first frequency domain resource.

Optionally, the first frequency domain resource is a frequency domain resource in a first subchannel; the first subchannel is a subchannel with a smallest index in a first subchannel set excluding a subchannel including a guard band PRB; the first subchannel set is a subchannel occupied by side data information associated with the side control information. In this way, it is possible to avoid using a subchannel including a guard band PRB to transmit PSCCH or PSSCH, and the problem of increased code rate due to too few available PRBs will not occur.

Or, optionally, the first frequency domain resources include part of the frequency domain resources in subchannel i and part or all of the frequency domain resources in subchannel i+1, the subchannel i and the subchannel i+1 are subchannels in the first subchannel set, and the subchannel i is the subchannel with the smallest index in the first subchannel set. In this way, the first device can occupy the frequency domain resources of two subchannels to send PSCCH, increase the number of PRBs used to carry PSCCH, and thereby improve the transmission performance of PSCCH.

Or, optionally, the first frequency domain resource is a frequency domain resource in subchannel i+1, the subchannel i+1 is a subchannel in the first subchannel set, and the subchannel i is the subchannel with the smallest index in the first subchannel set. In this way, the first device does not need to determine whether subchannel i includes a guard band PRB, and directly sends the side control information on the first frequency domain resource of subchannel i+1. On the one hand, it can reduce the computing power consumption of the first device, and on the other hand, it can ensure the number of available resources for the side control information and improve the transmission performance of the side control information.

In one possible design, if the subchannel i includes a guard band PRB, the first subchannel is the subchannel i+1; if the subchannel i does not include a guard band PRB, the first subchannel is the subchannel i.

In one possible design, the method further includes:

Obtain configuration information, wherein the configuration information is used to indicate that the side control information is carried on the subchannel with the smallest index in the subchannel that does not include the guard band PRB in the first subchannel set, or is used to indicate that the side control information is carried on the subchannel i and the subchannel i+1 in the first subchannel set, or is used to indicate that the side control information is carried on the subchannel i+1 in the first subchannel set.

In this way, the first device can send the side control information on the corresponding sub-channel according to the configuration information to improve the transmission reliability of the side control information.

In one possible design, the first frequency domain resource is a frequency domain resource in a first sub-channel, and the method further includes:

In a sixth aspect, the technical solution of the present application provides a communication method, which can be applicable to a second device. The second device can be an independent device, or a module, chip, device, etc. in the device. The method described includes: receiving side control information on the first frequency domain resource, and decoding side data information according to the side control information.

Optionally, the first frequency domain resource is a frequency domain resource in a first subchannel; the first subchannel is a subchannel with a smallest index in the first subchannel set excluding a subchannel including a guard band PRB; the first subchannel set is a subchannel occupied by the sideline data information associated with the sideline control information;

Or, optionally, the first frequency domain resources include part of the frequency domain resources in subchannel i and part or all of the frequency domain resources in subchannel i+1, the subchannel i and the subchannel i+1 are subchannels in a first subchannel set, and the subchannel i is the subchannel with the smallest index in the first subchannel set.

Or, optionally, the first frequency domain resource is a frequency domain resource in subchannel i+1, the subchannel i+1 is a subchannel in a first subchannel set, and the subchannel i is a subchannel with the smallest index in the first subchannel set.

In one possible design, the method further includes:

The sidelink data information is received. Resources occupied by the sidelink data information do not overlap with subchannels including a guard band PRB.

Receive indication information, where the indication information is used to indicate whether the sidelink data information occupies the sub-channel i.

In the seventh aspect, a communication method is provided, which can be applied to a first device, and the first device can be an independent device, or a module, chip, device, etc. in the device, and the method includes: the first device determines a first sub-channel set, and sends side control information on the first frequency domain resource, and the first frequency domain resource is a resource in the first sub-channel set. Among them, the first frequency domain resource can be understood as a frequency domain resource of a resource used to transmit side control information. The "used" here does not mean dedicated to sending side control information and side data information associated with the side control information, and can also include other information, which is not limited in the embodiments of the present application.

In one possible design, the method further includes:

Determine a candidate resource set, the candidate resource set does not include candidate resources that overlap with the guard band PRB, select the first subchannel set from the candidate resource set, and the first subchannel set is used to transmit the sideline control information and the sideline data information associated with the sideline control information. At this time, the first subchannel set does not include candidate resources that overlap with the guard band PRB. In this way, the first device can send PSSCH and PSCCH in a subchannel that does not include the guard band PRB, increase the number of available PRBs for PSCCH, and thus improve the transmission reliability of PSCCH.

In addition, since PSSCH does not occupy the subchannels including the guard band PRB in the RB set, but occupies the subchannels other than the subchannels including the guard band PRB in the RB set, the position of PSCCH detected by the receiving end is usually the subchannel with the lowest index actually occupied by PSSCH. It can be seen that by excluding the frequency domain resources including the guard band PRB, it is possible to avoid the subchannel with the lowest index among the subchannels occupied by PSSCH being the subchannel including the guard band PRB, which may lead to a reduction in the number of PSCCH available PRBs and improve the probability of successful decoding of PSSCH.

In one possible design, the method further includes:

The first subchannel set is selected from the candidate resource set, and the first subchannel set does not include candidate resources that overlap with the guard band PRB. At this time, the candidate resource set is a candidate resource set determined according to the process of "resource selection" in the fourth aspect of the technical term introduction. The candidate resource set includes candidate resources that overlap with the guard band PRB, or the candidate resource set includes Candidate resources that do not overlap with the guard band PRB.

The sidelink data information is sent on the candidate resource.

In one possible design, the method further includes:

The first device performs a listen-before-talk (LBT) process to obtain a first channel occupation time (COT), wherein the frequency domain resources corresponding to the first COT include the first frequency domain resources. Optionally, the first device performs a listen-before-talk (LBT) process in an unlicensed spectrum.

In one possible design, the method further includes:

When the first subchannel set includes a higher-indexed subchannel adjacent to the "subchannel including the guard band PRB", the first subchannel set also includes the "subchannel including the guard band PRB". The first frequency domain resource is a frequency domain resource in the higher-indexed subchannel adjacent to the "subchannel including the guard band PRB".

In one possible design, the method further includes:

Optionally, when the first device satisfies the first condition, when the first subchannel set includes a subchannel with a higher index adjacent to the “subchannel including the guard band PRB”, the first subchannel set also includes the “subchannel including the guard band PRB”. The first frequency domain resource is a frequency domain resource in a subchannel with a higher index adjacent to the “subchannel including the guard band PRB”.

Meeting the first condition may also be replaced by not meeting the second condition. For details of the first condition and the second condition, please refer to the description of the first condition and the second condition in S101.

Since the first device satisfies the first condition, it means that the number of remaining PRBs except the guard band PRBs in the subchannel including the guard band PRBs is small, so the code rate for transmitting the PSCCH will increase. At this time, the PSCCH is not transmitted using the subchannel but the next subchannel with a higher index of the channel is used to transmit the PSCCH, so that the number of PRBs of the PSCCH can be guaranteed, and the remaining PRBs are used to transmit data, thereby reducing the code rate of the PSSCH and ensuring reliability.

In an eighth aspect, a communication method is provided, which can be applied to a second device, and the second device can be an independent device, or a module, chip, device, etc. in the device, and the method includes: receiving side control information on a first frequency domain resource, the first frequency domain resource is a resource in a first subchannel set, and the first subchannel set is used to send side control information and side data information associated with the side control information. Among them, the first frequency domain resource can be understood as a frequency domain resource of a resource used to transmit side control information. The term "used" here does not mean dedicated to sending side control information and side data information associated with the side control information, and can also include other information, which is not limited in the embodiments of the present application.

In one possible design, it also includes:

The first subchannel set does not include candidate resources overlapping with a guard band PRB.

In one possible design, the method further includes:

In a ninth aspect, the present application provides a device comprising a module for implementing any design method of any of the above aspects.

In the tenth aspect, the present application provides a device, which terminal includes a processor and a memory, the memory is used to store computer program code, the computer program code includes computer instructions, and when the processor executes the computer instructions, it executes the method described in any possible design of any of the above aspects of the present application.

In the eleventh aspect, the technical solution of the present application provides a computer-readable storage medium, including computer instructions, which, when executed on a communication device, enables the communication device to execute the method described in any possible design of any of the above aspects.

In a twelfth aspect, the technical solution of the present application provides a computer program product. When the computer program product runs on a communication device, the communication device executes the method described in any possible design of any of the above aspects.

In a thirteenth aspect, an embodiment of the present application provides a communication device, which can implement the method implemented by the first device in any of the above aspects or any possible designs, or implement the method implemented by the second device in any of the above aspects or any possible designs. The device includes corresponding units or components for executing the above methods. The units included in the device can be implemented by software and/or hardware. The device can be, for example, an independent device, or a component or baseband chip, chip system, or processor that can support the implementation of the above methods in the device.

Exemplarily, the communication device includes a processor configured to support the communication device to perform the corresponding functions of the first device or the second device in the method shown above. The communication device may also include a memory, which may be coupled to the processor and stores the necessary program instructions and data of the communication device. Optionally, the communication device also includes an interface circuit, which is used to support communication between the communication device and other devices.

Exemplarily, when the communication device is used to implement the first device function:

The communication device may include modular components such as a transceiver unit (or communication module, transceiver module) and a processing unit (or processing module), which can perform the corresponding functions of the first device in any of the above aspects or any possible designs thereof. When the communication device is the first device, the transceiver unit may be a transmitter and a receiver, or a transceiver obtained by integrating a transmitter and a receiver. The transceiver unit may include an antenna and a radio frequency circuit, etc., and the processing unit may be a processor, such as a baseband chip, etc. When the communication device is a component having the functions of the above-mentioned first device, the transceiver unit may be a radio frequency unit, and the processing unit may be a processor. When the communication device is a chip system, the transceiver unit may be an input and output interface of the chip system, and the processing unit may be a processor of the chip system, such as a central processing unit (CPU).

The transceiver unit may be used to perform the receiving and/or sending actions performed by the first device in any aspect or any possible design thereof. The processing unit may be used to perform actions other than receiving and sending performed by the first device in any aspect or any possible design thereof.

In a fourteenth aspect, a communication system is provided, which includes the first device and the second device involved in any aspect.

In a fifteenth aspect, a circuit is provided, the circuit being coupled to a memory, and the circuit being used to execute the method shown in any of the above aspects or any possible implementation manners thereof. The circuit may include a chip circuit.

BRIEF DESCRIPTION OF THE DRAWINGS

1A-1F are schematic diagrams of scenes of related technologies;

2A-2E are schematic diagrams of a system architecture provided in an embodiment of the present application;

FIG3 is a schematic diagram of the structure of a communication device provided in an embodiment of the present application;

FIG4A is a flow chart of a communication method provided in an embodiment of the present application;

FIG4B is a schematic diagram of a protection band provided in an embodiment of the present application;

5 to 8 are schematic diagrams of applicable scenarios provided by embodiments of the present application;

FIG9 is a schematic diagram of resource mapping provided in an embodiment of the present application;

FIG10 is a flow chart of a communication method provided in an embodiment of the present application;

FIG11 is a schematic diagram of an applicable scenario provided by an embodiment of the present application;

FIG12 is a flow chart of a communication method provided in an embodiment of the present application;

13 to 17 are schematic diagrams of applicable scenarios provided by embodiments of the present application;

FIG18 is a flow chart of a communication method provided in an embodiment of the present application;

19 to 22 are schematic diagrams of applicable scenarios provided by embodiments of the present application;

FIG23 is a schematic diagram of the structure of a communication device provided in an embodiment of the present application;

FIG. 24 is a schematic diagram of the structure of a chip system provided in an embodiment of the present application.

DETAILED DESCRIPTION

The terms "first" and "second" and the like in the specification and drawings of this application are used to distinguish different objects, or to distinguish different processing of the same object, rather than to describe a specific order of objects.

"At least one" means one or more.

"Plurality" means two or more.

"And/or" describes the association relationship of associated objects, indicating that there can be three types of relationships. For example, A and/or B can mean: A exists alone, A and B exist at the same time, and B exists alone, where A and B can be singular or plural.

The character “/” generally indicates that the related objects are in an “or” relationship. For example, A/B can mean A or B.

In addition, the terms "including" and "having" and any variations thereof mentioned in the description of the present application are intended to cover non-exclusive inclusions. For example, a process, method, system, product or device comprising a series of steps or units is not limited to the listed steps or units, but may optionally include other steps or units that are not listed, or may optionally include other steps or units that are inherent to these processes, methods, products or devices.

It should be noted that in the embodiments of the present application, words such as "exemplary" or "for example" are used to indicate examples, illustrations or descriptions. Any embodiment or design described as "exemplary" or "for example" in the embodiments of the present application should not be interpreted as being more preferred or more advantageous than other embodiments or designs. Specifically, the use of words such as "exemplary" or "for example" is intended to present related concepts in a specific way.

In the embodiments of the present application, sometimes a subscript such as W1 may be mistakenly written as a non-subscript such as W1. When the difference is not emphasized, the meanings to be expressed are consistent.

The explanations of nouns, terms, and expressions in each embodiment of the present application are applicable to other embodiments of the present invention.

The various embodiments of this solution can be implemented independently or in combination based on certain internal connections.

In each embodiment of this solution, different implementations may be implemented in combination or independently.

Unless otherwise specified, the description of resources in each embodiment of this solution may refer to time domain resources and/or frequency domain resources and/or time-frequency resources. The granularity of time domain resources may be any of radio frames, subframes, time slots, mini-time slots, symbols, seconds, milliseconds, microseconds, etc. The granularity of frequency domain resources may be any of RE, RB, interlace, subchannel, RB set, subcarrier, Hz, kHz, MHz, etc.

The description of resource overlap in each embodiment of the present solution may refer to time domain resource overlap, and/or frequency domain resource overlap, and/or time-frequency domain resource overlap (i.e., simultaneous overlap in the time-frequency domain). In addition, it may also refer to partial overlap or full overlap. The same applies to resource conflict.

First, the technical terms involved in the embodiments of the present application are introduced:

1. Resource pool (RP)

The resource pool may include a resource block (RB) set. RB set is a set of RBs. RB can also be understood as (physical resource block, PRB). An RB set can be understood as a channel. In some examples, the bandwidth of an RB set is 20M.

An RB set may include one or more sub-channels. The number of PRBs included in a sub-channel can also be understood as the sub-channel size.

The PRBs in the resource pool have corresponding numbers (or indexes). The two edge PRBs in the resource pool are the PRB with the largest index and the PRB with the smallest index. A PRB includes one or more REs. Exemplarily, a PRB includes 12 REs.

Optionally, the subchannels in each RB set may be numbered independently or uniformly. For example, as shown in (a) of FIG. 1A , the subchannels in RB set0 and RB set1 are numbered independently, the subchannels in RB set0 are numbered from 0 to 4, and the subchannels in RB set1 are numbered from 0 to 4. For another example, as shown in (b) of FIG. 1A , the subchannels in RB set0 and RB set1 are numbered uniformly, from subchannel 0 to subchannel 9.

The resource pool may also include PRBs in the guard band. The guard band can be used to ensure sufficient isolation between channels to prevent spectrum leakage and adjacent channel interference. The number of guard band PRBs in the resource pool can be semi-statically configured or preset. The guard band is related to the size of the subcarrier spacing.

2. Listen before talk (LBT)

In the unlicensed spectrum, each terminal is eligible to use the spectrum, but different terminals using the same time-frequency resources may cause conflicts, and transmission reliability cannot be guaranteed. Therefore, in the unlicensed spectrum, the terminal can detect whether the channel is idle and access the channel for communication when the channel is idle. In this way, resource conflicts between terminals can be avoided and transmission reliability can be improved. The process of the terminal detecting whether the channel is idle is called the LBT process (also called the channel access process). If LBT is successful, it means that the channel is idle, and the terminal can access the channel and use the resources in the resource pool for communication.

Optionally, the terminal can perform LBT on one or more resource block (RB) sets.

3. Channel occupied time (COT)

After LBT is successful, the terminal can continue to occupy the channel for a period of time after accessing the channel. In the time domain, the terminal initializes COT, which means that the terminal can occupy the channel within the COT. In the frequency domain, the specific frequency domain resources used by the terminal can be determined based on factors such as the number of channels on which the terminal performs LBT and whether it is frequency-division multiplexed with other terminals. A channel occupied by a terminal can be understood as an RB set, or the smallest frequency domain unit for performing LBT.

For example, as shown in FIG1B , the terminal succeeds in LBT in both RB set 1 and RB set 0, so the frequency domain resources in the two RB sets can be used for communication. The time domain length corresponding to COT is the duration L, and the frequency domain length corresponding to COT is the length of the two RB sets.

In some examples, the maximum channel occupancy time (MCOT) for a terminal to occupy a channel may be referred to as the maximum channel occupancy time (MCOT). The MCOTs corresponding to different channel access priority classes (CAPC) may be different.

Among them, CAPC is associated with the difficulty of channel access. For example, a small CAPC value makes it easier to access the channel; a large CAPC value makes it more difficult to access the channel. Alternatively, a small CAPC value makes it possible to access the channel in a shorter time; a large CAPC value makes it take a longer time to access the channel.

Exemplarily, the values of MCOT under different CAPCs may be as shown in Table 1 below. The values of MCOT and the corresponding relationship between CAPC and MCOT in the embodiment of the present application are not limited to those shown in Table 1 below.

Table 1

The PRBs included in the guard band between two adjacent RB sets also belong to COT. As shown in Figure 1B, the terminal performs LBT on RB set0 and RB set1, and accesses the channel after success, occupying a period of time. The time domain length of COT is L, and the frequency domain length corresponding to COT is the total length of the two RB sets and the guard band.

4. Resource selection

In some schemes, the MAC layer of the terminal can trigger the physical layer to perform resource selection and report the candidate resource set to the MAC layer. When data needs to be transmitted (for example, the terminal has a data packet to be sent), the MAC layer selects a candidate resource for transmitting data from the candidate resource set.

Taking the sidelink (SL) scenario as an example, in some solutions, the terminal can obtain resources through sensing. This resource selection method can be called mode 2 resource selection.

In this resource selection method, the terminal can blindly detect the sidelink control information (SCI) of other terminals and select resources based on the SCI of other terminals.

As a possible implementation manner, the terminal executes the following steps 1-7 to determine a candidate resource set (resource selection process of mode 2).

Step 1: Confirm the resource selection window.

Exemplarily, as shown in FIG1C , the terminal is triggered to perform resource selection at time n, and performs resource selection within a resource selection window, and the duration of the resource selection window is [n+T1, n+T2].

Step 2: Determine the perception window.

Exemplarily, as shown in FIG1C , the terminal performs detection within a perception window, and the duration of the perception window is [n-T0, n-Tproc, 0].

Step 3: Determine the reference signal receive power (RSRP) threshold.

Step 4: Determine the initial candidate resource set as the set of all candidate resources within the resource selection window.

Step 5: Exclude candidate resources corresponding to unmonitored time slots in the perception window from the initial candidate resource set to obtain a candidate resource set.

Step 6: Based on the reserved resources indicated by the SCI detected within the perception window and the measured RSRP, exclude candidate resources overlapping with the reserved resources with high interference from the candidate resource set.

For a certain terminal A, the SCI sent by the terminal A carries the reserved resources of the terminal A. In this way, other terminals can learn the resources reserved by the terminal A according to the SCI and exclude the resources reserved by the terminal A during resource selection to avoid resource collision between terminals.

Optionally, step 6 can also be replaced by: based on the reserved resources indicated by the SCI detected in the perception window and the measured reference signal strength indicator (RSSI), excluding candidate resources that overlap with the reserved resources with high interference in the candidate resource set.

Step 7: If the number of candidate resources in the candidate resource set is less than the number of candidate resources in the initial candidate resource set, increase the RSRP threshold and continue to execute step 4.

5. Physical Side Control Channel (PSCCH)

In SL communication, SCI may include a first-level SCI (or first-order SCI) and a second-level SCI (or second-order SCI), wherein the first-level SCI may be carried on the PSCCH and the second-level SCI may be carried on the PSSCH.

In the time domain, PSCCH can occupy two or three OFDM symbols starting from the second symbol in a time slot. As shown in Figure 1D, a time slot contains 14 symbols. Starting from symbol 0, symbols 1-2 or symbols 1-3 are used to transmit PSCCH. Whether PSCCH occupies three symbols or two symbols can be configured or pre-configured by the base station.

For example, as shown in FIG1D , in a time slot, the first orthogonal frequency-division multiplexing (OFDM) symbol copies the information sent on the second symbol for automatic gain control (AGC). The AGC symbol does not transmit valid data information. That is, symbol 0 can be an AGC symbol, and symbol 0 is a copy of symbol 1, and the contents of symbol 0 and symbol 1 are exactly the same. PSSCH is mapped starting from symbol 1. Symbols 1 to 3 are used to transmit PSCCH, and symbols 1 to 9 are used to transmit PSSCH. PSCCH and PSSCH are frequency-division multiplexed.

In the frequency domain, the PRBs occupied by PSCCH can start from the lowest PRB of the lowest subchannel of PSSCH scheduled by PSCCH, and the number of PRBs occupied by PSCCH does not exceed the number of PRBs contained in a subchannel in the resource pool. PSCCH consists of {10,12,15,20,25} PRBs, and the specific value can be indicated by the high-level parameters. The number of PRBs contained in the subchannel includes {10,12,15,20,25,50,75,100}, and the specific value can be indicated by the high-level parameters.

In the frequency domain, the number of PRBs occupied by PSCCH can be called the number of PSCCH resources (PSCCH size). The number of PSCCH resources can be semi-statically configured, such as network equipment configuration or pre-configuration.

Exemplarily, still as shown in Figure 1D, the subchannels occupied by the PSSCH scheduled by the PSCCH are subchannel i-subchannel n, where the subchannel i has the lowest index. Then the starting position of the resources occupied by the PSCCH is the PRB with the lowest index in subchannel i. Starting from the lowest PRB, the number of PRBs occupied by the PSCCH is the PSCCH size.

6. Physical sidelink shared channel (PSSCH)

PSSCH can be used to carry the second-level SCI and sidelink data information.

In the time domain, the number of symbols used to carry PSSCH in a time slot is related to whether the time slot contains physical sidelink feedback channel (PSFCH) resources. For example, as shown in Figure 1D, when a time slot contains PSFCH resources, there are 9 symbols in the time slot used to carry PSSCH. As shown in Figure 1E, when a time slot does not contain PSFCH resources, there are 12 symbols in the time slot used to carry PSSCH.

In the frequency domain, PSSCH occupies L consecutive (positive integer) sub-channels.

7. PSFCH

PSFCH can be used to carry hybrid automatic repeat request (HARQ) information. HARQ information includes ACK or NACK.

HARQ is a technology that combines forward error correction (FEC) and automatic repeat request (ARQ). Among them, FEC technology adds redundant error correction codes to the transmission code sequence. Under certain conditions, it can automatically correct transmission errors through decoding and reduce the bit error rate (BER) of the received signal. ARQ recovers erroneous messages by requesting the sender to retransmit erroneous data messages at the receiving end. It is one of the methods used in communication to deal with errors caused by the channel. The sender sends data to the receiver. If the receiver successfully decodes the data, it will feedback ACK. If the receiver fails to decode the data, it will feedback NACK.

In NR-V, unicast and multicast support HARQ feedback. The HARQ feedback mode for unicast is: if the receiving end successfully decodes the data, it will feedback ACK; if the receiving end fails to decode the data, it will feedback NACK. There are two HARQ feedback modes for multicast. One is the same as unicast, which is multicast option 2. If the receiving end successfully decodes the data, it will feedback ACK; if the receiving end fails to decode the data, it will feedback NACK. The other feedback mode is: if the receiving end successfully decodes the data, it will not feedback; if the receiving end fails to decode the data, it will feedback NACK, which is the NACK only feedback mode.

Optionally, in a time slot containing PSFCH resources, the penultimate and third OFDM symbols of the time slot can be used to carry PSFCH. As shown in FIG. 1D , symbol 11 and symbol 12 are used to carry PSFCH. Exemplarily, symbol 11 is an AGC symbol, and symbol 11 is a copy of symbol 12 so that the receiving end can perform AGC adjustment.

Optionally, PSFCH resources are periodically configured in the resource pool, such as N = 0, 1, 2, 4. Where N = 0 means that the resource pool does not contain PSFCH resources, and the HARQ function is disabled at this time, and HARQ cannot be transmitted. As shown in Figure 1F, the period of PSFCH resources is 2 time slots, and one time slot in every two time slots includes PSFCH resources.

8. Time gap (GAP) symbol

For half-duplex terminals, only one can send or receive at the same time, not both. When such terminals receive first and then send, or send first and then receive, they need time to switch between sending and receiving, and cannot be seamlessly connected immediately.

The terminal may receive and send information in two consecutive time slots, or may receive and send information in the same time slot. Therefore, a GAP symbol is required for the terminal's transceiver conversion.

For example, as shown in FIG1F , the transmission direction of the terminal in time slot n and time slot n+1 may be inconsistent, for example, PSSCH, PSSCH is received in time slot n+1. At this time, the last symbol of each time slot is a GAP symbol.

As another example, as shown in FIG1D , symbol 9 is used to transmit PSSCH. Considering that the transmission directions of PSSCH and subsequent PSFCH may be different, symbol 10 is a GAP symbol, and the terminal does not send or receive on the GAP symbol, but performs a send-receive conversion. Symbols 11 and 12 are used to transmit PSFCH.

When a terminal successfully accesses an RB set, the ownership of the guard band PRB does not belong to the terminal. For example, as shown in Figure 1B, terminal 1 successfully accesses RB set 1, and terminal 2 successfully accesses RB set 0, and RB set 1 and RB set 0 are adjacent RB sets. At this time, the guard band PRB and the RB sets that the two terminals successfully access are adjacent. Therefore, it is impossible to say which terminal the guard band PRB belongs to. Therefore, when the terminal successfully LBTs on an RB set, the guard band PRB cannot be used. That is, it is impossible to use the guard band PRB to transmit PSCCH or PSSCH. When the terminal successfully LBTs on two adjacent RB sets and the terminal transmits on two adjacent RB sets, the PRB in the guard band can be used. When different terminals access the channel, some terminals send on one RB set and some send on multiple RB sets. Therefore, if the guard band PRB can be used to transmit PSCCH, the receiving end cannot determine whether the transmitting end sends on one RB set or on multiple RB sets when blindly detecting PSCCH, that is, it cannot determine whether the transmitting end occupies the guard band PRB to transmit PSCCH. At this time, the transmitting and receiving sides may have inconsistent understanding during blind detection, resulting in increased blind detection complexity. Therefore, when two adjacent RB sets belong to the same terminal, the guard band PRB cannot be used to transmit PSCCH.

It can be seen that in some scenarios, when the subchannel occupied by PSCCH includes PRBs in the guard band, since the PRBs in the guard band cannot be used to transmit PSCCH, the number of PRBs that can be used by PSCCH in the subchannel is reduced, the code rate of PSCCH increases, and the probability of PSCCH decoding failure is high. For example, as shown in (b) of Figure 1A, assuming that the terminal successfully accesses RB set1 and PSSCH transmission occupies subchannel 5, subchannel 5 is used to carry PSCCH. Since the guard band PRBs cannot be used to transmit PSCCH, the number of PRBs that can be used to transmit PSCCH in subchannel 5 is reduced, resulting in an increase in the code rate of PSCCH and low reliability of PSCCH transmission.

In addition, the transmitter sometimes sends PSCCH using a subchannel including a guard band PRB, and sometimes does not send PSCCH using this subchannel, so that the receiver can sometimes detect PSCCH in this subchannel, and sometimes cannot detect PSCCH in this subchannel, and the blind detection complexity is high.

To solve the above problems, an embodiment of the present application provides a communication method, which can be applied to cellular communication, Internet of Vehicles, terminal direct communication (such as sidelink (SL) communication), wireless fidelity (Wi-Fi) communication system or other systems. Optionally, the cellular communication system includes but is not limited to a new radio (NR) communication system, a long term evolution (LTE) system, and a subsequently evolved communication system (such as a 6G communication system, etc.).

Exemplarily, FIG2A shows an architecture of a communication system applicable to an embodiment of the present application. The system may include a terminal (such as devices 1-3). A direct communication link may be established between the terminal and surrounding terminals to achieve direct communication, such as: device 1 and device 2 may communicate directly.

Optionally, in each embodiment of the present application, the terminal may also be replaced by a terminal device, a device, a terminal apparatus, a device, etc.

Exemplarily, the direct communication link established between terminals can be defined as SL, and the interface for direct communication between the terminal and surrounding terminals can be called PC5 port. Exemplarily, the terminal can communicate through SL when there is no network coverage. Exemplarily, the terminal within the network coverage can communicate with the terminal outside the network coverage through SL.

Optionally, the communication system shown in FIG2A may further include a network device. The terminal may send a message to the opposite terminal by means of a network device relay, such as: device 1 may send a message (such as a vehicle-to-everything (V2X) message) to the network device, and the network device may send the message to device 2.

Exemplarily, the communication link through which the terminal sends information to the network device can be defined as an uplink (UL), the communication link through which the terminal receives information from the network device can be defined as a downlink (DL), and the interface between the terminal and the network device can be called a Uu interface.

Optionally, the network architecture shown in FIG2A is only an exemplary architecture diagram, and the embodiment of the present application does not limit the number of devices included in the communication system shown in FIG2A. In addition, although not shown, in addition to the functional entities shown in FIG2A, the network shown in FIG2A may also include other functional entities, such as: application server (application server), core network equipment, etc., without limitation.

The network device in FIG2A can be used to implement wireless physical control functions, resource scheduling and wireless resource management, wireless access control, mobility management and other functions. The network device can be an access network (AN)/radio access network (RAN) device, or a device composed of multiple 5G-AN/5G-RAN nodes, or a base station (nodeB, NB), an evolution nodeB (eNB), a next generation base station (generation nodeB, Any node in a gNB), a transmission receive point (TRP), a transmission point (TP), and some other access node. In the embodiment of the present application, the device for implementing the function of the network device may be a network device, or a device that can support the network device to implement the function, such as a chip system. In the technical solution provided in the embodiment of the present application, the technical solution provided in the embodiment of the present application is described by taking the device for implementing the function of the network device as an example that the network device is an example.

The above-mentioned terminal is a terminal that is connected to the above-mentioned communication system and has a wireless transceiver function or a chip that can be set in the terminal. Exemplarily, the terminal can be a vehicle, which is not limited to any type of vehicle such as a car, bicycle, electric car, airplane, ship, train, high-speed rail, etc. The vehicle can include an on-board device that can directly communicate with other devices. The on-board device can be called a user equipment (user equipment) or a terminal.

The terminal may also be a user device, an access terminal, a user unit, a user station, a mobile station, a mobile station, a remote station, a remote terminal, a mobile device, a user terminal, a terminal, a wireless communication device, a user agent or a user device. For example, the terminal in the embodiments of the present application may be a mobile phone, a tablet computer, a computer with a wireless transceiver function, a virtual reality (VR) terminal, an augmented reality (AR) terminal, a mixed reality (MR) terminal, a vehicle user equipment (V equipment), 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, a vehicle-mounted terminal, an RSU with terminal function, etc. The terminal of the present application can also be a vehicle-mounted module, vehicle-mounted module, vehicle-mounted component, vehicle-mounted chip or vehicle-mounted unit built into the vehicle as one or more components or units. The vehicle can implement the communication method provided by the present application through the built-in vehicle-mounted module, vehicle-mounted module, vehicle-mounted component, vehicle-mounted chip or vehicle-mounted unit.

FIG2B shows another example of a communication system to which an embodiment of the present application is applicable, in which a terminal may be a vehicle (or a vehicle-mounted device), etc. Vehicles (or vehicle-mounted devices) and network devices and vehicles (or vehicle-mounted devices) may communicate with each other. Communication between vehicles may be referred to as vehicle-to-vehicle (V2V) communication. V2V communication is a type of vehicle-to-everything (V2X) communication.

As shown in Figure 2C, V2X can also include scenarios such as vehicle to person (V2P), vehicle to infrastructure (V2I), and vehicle to network (V2N).

FIG2D shows another example of a communication system to which the embodiments of the present application are applicable, wherein the terminal in the communication system may be an AR/VR/MR device, a processing device/display device (a mobile phone, a computer, a tablet, etc.), etc. The AR/VR/MR device and the processing device/display device may communicate with each other according to the method provided in the embodiments of the present application.

Fig. 2E shows another example of a communication system to which the embodiment of the present application is applicable, and the communication system may be a Wi-Fi system. A network device (such as a router) and a terminal, or terminals may communicate with each other according to the method provided in the embodiment of the present application.

In the embodiment of the present application, the device for implementing the function of the terminal may be the terminal itself, or a device capable of supporting the terminal to implement the function, such as a chip system. In the embodiment of the present application, the chip system may be composed of a chip, or may include a chip and other discrete devices.

The system architecture and business scenarios described in this application are intended to more clearly illustrate the technical solutions of this application, and do not constitute the sole limitation on the technical solutions provided by this application. A person of ordinary skill in the art will appreciate that, with the evolution of the system architecture and the emergence of new business scenarios, the technical solutions provided by this application are equally applicable to similar technical problems.

Optionally, the terminal or network device in the embodiment of the present application can be implemented by a communication device having the structure described in Figure 3. Figure 3 is a schematic diagram of the hardware structure of the communication device provided in the embodiment of the present application. The communication device 400 includes at least one processor 401, a memory 403 and at least one communication interface 404. Among them, the memory 403 can also be included in the processor 401.

Processor 401 can be composed of one or more processing units, which can be a central processing unit (CPU), an application-specific integrated circuit (ASIC), or one or more integrated circuits for controlling the execution of the program of the present application.

There are communication lines between the above components for transmitting information between the components.

Communication interface 404, used to communicate with other devices. In the embodiment of the present application, the communication interface can be a module, circuit, interface or other device capable of implementing communication functions, used to communicate with other devices. Optionally, the communication interface can be an independently set transmitter, which can be used to send information to other devices, and the communication interface can also be an independently set receiver, which can be used to send information to other devices. Receive information from other devices. The communication interface may also be a component that integrates the functions of sending and receiving information, and the embodiment of the present application does not limit the specific implementation of the communication interface.

The memory 403 may be a read-only memory (ROM) or other types of storage modules that can store static information and instructions, a random access memory (RAM) or other types of storage modules that can dynamically store information and instructions, or an electrically erasable programmable read-only memory (EEPROM), an optical disk, a magnetic disk or other magnetic storage device. The memory may be independent and connected to the processor through a communication line. The memory may also be integrated with the processor.

The memory 403 is used to store computer-executable instructions, and the computer-executable instructions can be called by one or more processing units in the processor 401 to execute corresponding steps in each method provided in the following embodiments.

Optionally, the computer-executable instructions in the embodiments of the present application may also be referred to as application code, instructions, computer program or other names, which are not specifically limited in the embodiments of the present application.

In a specific implementation, as an embodiment, the communication device 400 may include multiple processors, such as the processor 401 and the processor 407 in FIG. 3. Each of these processors may be a single-core processor or a multi-core processor. The processor here may refer to one or more devices, circuits, and/or processing cores for processing data (e.g., computer program instructions).

FIG3 is an exemplary structural diagram of a communication device. It should be understood that the communication device shown in the figure is only an example, and in actual applications the communication device may have more or fewer components than those shown in FIG3, may combine two or more components, or may have a different component configuration.

The communication device 400 mentioned above may be a general device or a dedicated device, and the embodiment of the present application does not limit the type of the communication device 400. The terminal may be a device having a similar structure to that shown in FIG3 .

The communication method provided in the embodiments of the present application is described below with reference to the accompanying drawings.

Referring to FIG. 4A , the communication method provided in the embodiment of the present application includes the following steps:

S101. A first device determines a first frequency domain resource.

In the embodiment of the present application, the first frequency domain resource is a frequency domain resource for transmitting PSCCH. It can also be understood that the first frequency domain resource is a frequency domain resource of a resource (time-frequency resource) for transmitting PSCCH. Alternatively, the first frequency domain resource can be understood as a frequency domain resource for the first device to transmit side control information (SCI).

The first frequency domain resource belongs to the first subchannel set. The first subchannel set includes subchannel i and subchannel i+1, where i is an integer greater than or equal to 0. Among them, the first subchannel set is the set of subchannels occupied by the sideline data information associated with the sideline control information (SCI) sent on the first frequency domain resource. The first subchannel set can also be understood as the subchannel occupied by the PSSCH associated with the PSCCH. That is, the sideline control information is carried on the PSCCH. The sideline data information is carried on the PSSCH. Or the first subchannel set is the set of subchannels occupied by the PSCCH sent on the first frequency domain resource and the PSSCH associated with the PSCCH. It can also be understood that the first subchannel set carries the sideline control information and the sideline data information corresponding to the sideline control information.

In the embodiment of the present application, the first frequency domain resource is a frequency domain resource used to transmit the PSCCH. It can also be understood that the first frequency domain resource is a frequency domain resource of a resource used to transmit the PSCCH.

Optionally, in an embodiment of the present application, in a possible design, the resources included in the first sub-channel set are resources in an unlicensed spectrum. Alternatively, it can be understood that the first sub-channel set is a resource in an unlicensed spectrum.

In the unlicensed spectrum, a resource pool includes one or more RB sets. There is an intra-cell guard band between two adjacent RB sets. The intra-cell guard band can also be understood as a guard band, a guard band within a cell, or a guard interval. The number of PRBs included in the intra-cell gurad band can be configured by the network device, or pre-configured, or pre-defined. For example, the intra-cell gurad band can include 5 or 6 PRBs. The PRBs in the intra-cell gurad band are also called guard band PRBs or GB PRBs.

In the embodiment of the present application, the first device performs LBT and accesses the first channel (the channel can be understood as an RB set or 20M or LBT frequency domain unit). Optionally, the time domain range corresponding to the accessed first channel can be called a first COT, for example, refer to the description of step S106. Optionally, the first channel is the frequency domain range corresponding to the first COT.

The first channel may be one or more channels, that is, the first device may access multiple RB sets or multiple 20M frequency bands when performing LBT. A guard band exists between two adjacent channels.

As shown in (a) of FIG. 4B , there is a guard band between RB set 0 and RB set 1, and subchannel 4 of RB set 0 includes the guard band. PRB, subchannel 5 of RB set 1 includes a guard band PRB. As shown in FIG4B(b), subchannel 5 of RB set 1 includes a guard band PRB. As shown in FIG4B(c), subchannel 4 of RB set 0 includes a guard band PRB.

The first device may perform LBT and determine a first subchannel set in the accessed first channel. A subchannel may also be referred to as a subchannel. A subchannel is a set of PRBs. The number of PRBs included in a subchannel may be fixed or unfixed. The number of PRBs included in a subchannel may be configured, preconfigured, or predefined by a network device. A subchannel may be a frequency domain unit for data scheduling.

Exemplarily, as shown in FIG5 , the first device succeeds in LBT on RB set 1, and RB set 1 includes subchannels 5 to 9. The first device can use resources on subchannels 5 to 9 to transmit PSSCH. Assuming that the first device determines to transmit PSSCH on subchannels 5 to 8, the elements of the first subchannel set are subchannels 5 to 8 (shown in boxes marked with dots). Among them, subchannel 5 in the first subchannel set includes a guard band PRB (shown in a box marked with slashes), or it can be understood that subchannel 5 overlaps with at least one PRB in the guard band, or it can be understood that subchannel 5 includes at least one PRB in the guard band.

In an embodiment of the present application, the first device may determine whether resources other than the guard band PRB in the subchannel i are sufficient for transmitting the PSCCH, and determine the subchannel for carrying the PSCCH based on the determination result.

In the embodiment of the present application, subchannel i is the subchannel with the lowest index in the first subchannel set. Exemplarily, as shown in FIG5 , subchannel 5 with the lowest index in the first subchannel set (shown as a box marked with dots) is subchannel i.

In one case, if the resources other than the guard band PRB in subchannel i meet the first condition, the first frequency domain resource is the frequency domain resource in subchannel i+1. In other words, the first device carries the PSCCH on the first frequency domain resource of subchannel i+1. In other words, the first device determines a frequency domain resource in subchannel i+1 as the first frequency domain resource according to the amount of side control information. For the specific method of determining the first frequency domain resource in subchannel i+1, refer to the description of case 2 in S102.

Optionally, the first condition includes one of the following conditions: the number of resource blocks other than the guard band PRB in subchannel i is less than the first threshold; the proportion of resource blocks other than the guard band PRB in subchannel i in all resource blocks included in subchannel i is less than the second threshold; the code rate of the side control information corresponding to the resources other than the guard band PRB in subchannel i is greater than the third threshold. The resources other than the guard band PRB in subchannel i meet the first condition, which means that the resources other than the guard band PRB in subchannel i are not sufficient for transmitting PSCCH. In this case, the first device can determine the first frequency domain resource in subchannel i+1 and carry PSCCH on the first frequency domain resource. For the specific method of determining the first frequency domain resource in subchannel i+1, refer to the description of case 2 in S102. Thereby, a block of resources sufficient to transmit PSCCH can be determined.

In other words, if the resources in subchannel i do not meet the second condition, the first frequency domain resource is determined to be the frequency domain resource in subchannel i+1. The second condition is: the number of resource blocks other than the guard band PRB in subchannel i is greater than or equal to the first threshold; the proportion of resource blocks other than the guard band PRB in subchannel i in all resource blocks included in subchannel i is greater than or equal to the second threshold; the code rate of the side control information corresponding to the resources other than the guard band PRB in subchannel i is less than or equal to the third threshold.

The resources in subchannel i except the guard band PRB can also be understood as the resources in subchannel i that can be used to transmit side information. Or the remaining resources in subchannel i except the guard band PRB. Here, the resources can be understood as PRB, i.e., resource blocks. The side information includes side data information and/or side control information. Or, it can be understood as the resources in subchannel i that can be used for information transmission.

Optionally, the first threshold is a preconfigured or network device configured or preset or fixed value. The first threshold may be a set of positive integers. Among them, the UE outside the network coverage can be preconfigured, and the UE within the network coverage can be configured by the network device.

Optionally, the second threshold is preconfigured or configured by the network device or preset or predefined or fixed. The second threshold is greater than or equal to 0 and less than or equal to 1. Optionally, the UE outside the network coverage can be preconfigured, and the UE within the network coverage can be configured by the network device.

Optionally, the third threshold is a preconfigured or network device configured or preset or predefined or fixed value. The third threshold is greater than or equal to 0 and less than or equal to 1. Among them, the UE outside the network coverage can be preconfigured, and the UE within the network coverage can be configured by the network device.

Optionally, the first threshold is the number of PSCCH resources, which can be understood as the number of PRBs used to transmit PSCCH. The number of PSCCH resources can be understood as the mapping length of PSCCH in the resource mapping process. Exemplarily, the granularity of resource mapping is PRB. For example, the PRB size occupied by PSCCH configured by the network device is 8 (the mapping length of PSCCH is 8), which means This means that 8 PRBs can meet the PSCCH code rate requirement. When the number of PRBs that PSCCH can actually occupy is less than 8, it means that the PSCCH code rate cannot meet the configuration requirement, resulting in an increased probability of data decoding failure.

Optionally, the first threshold and the number of PRBs occupied by the PSCCH can be two independent parameters. The first threshold and the number of PRBs occupied by the PSCCH can be the same or different. For example, the first threshold configured by the network device is 10, and the PRB size occupied by the PSCCH configured by the network device is 8. The first threshold can be understood as the minimum number of PRBs used to transmit the PSCCH, or the lower limit of the number of resources used to transmit the PSCCH. The minimum number of PRBs corresponds to the highest code rate of the PSCCH.

Optionally, the first threshold is determined based on threshold A, and threshold A can be configured or preconfigured or preset or predefined or a fixed value by the network device. Threshold A represents the maximum code rate or the highest code rate of the PSCCH. The first device can calculate the first threshold based on threshold A and the number of bits carried by the PSCCH. The first threshold represents the minimum number of PRBs occupied by the PSCCH corresponding to the maximum code rate.

The code rate of the PSCCH is the ratio between the number of bits carried by the PSCCH and the number of REs occupied by the PSCCH. Accordingly, the relationship between the first threshold and the threshold A satisfies the following formula:

threshold=(PSCCH_bit)/(thre_A*m); threshold represents the first threshold, PSCCH_bit represents the number of bits carried by PSCCH, thre_A represents the threshold A, and m represents the number of REs included in an RB, where m is a positive integer, for example, m is 12.

For example, as shown in FIG5 , it is assumed that the number of PSCCH resources (PSCCH size) is 8 PRBs, the total number of PRBs in subchannel 5 is 10, and the number of guard band PRBs in subchannel 5 is 3. Since the number of PRBs other than the guard band PRBs in subchannel 5 (which may be referred to as the remaining PRBs in subchannel 5) is less than 8 and is insufficient for transmitting PSCCH, the first device may determine the first frequency domain resource on subchannel 6 and carry PSCCH on the first frequency domain resource. In this way, it is possible to ensure that PSCCH is carried on a sufficient number of PRBs, thereby improving the reliability of PSCCH transmission.

FIG5 is an example of the first frequency domain resource being 8 PRBs. In another embodiment of the present application, the first device may also carry PSCCH on all PRBs of subchannel 6. In this way, the number of resources used to transmit PSCCH can be increased, and the transmission performance of PSCCH can be improved.

Alternatively, in one case, if the resources other than the guard band PRB in subchannel i meet the first condition, the first frequency domain resources include part of the frequency domain resources in subchannel i and part or all of the frequency domain resources in subchannel i+1. It can also be understood that when the resources other than the guard band PRB in subchannel i meet the first condition, the first terminal device determines part of the resources in subchannel i and part or all of the resources in subchannel i+1 as the first frequency domain resources for transmitting PSCCH. In other words, the first device carries PSCCH on subchannel i+1 and the first frequency domain resources in subchannel i. That is, the first frequency domain resources include some frequency domain resources in subchannel i and some frequency domain resources in subchannel i+1. Optionally, the resources in subchannel i belonging to the first frequency domain resources are adjacent to the resources in subchannel i+1 belonging to the first frequency domain resources, that is, the first frequency domain resources are a continuous frequency domain resource. For a specific method of determining the first frequency domain resources in subchannel i+1, refer to the description of case 3 in S102.

It can also be said that if the resources in subchannel i do not meet the second condition, the first frequency domain resources include part of the frequency domain resources in subchannel i and part or all of the frequency domain resources in subchannel i+1. The second condition is: the number of resource blocks other than the guard band PRB in subchannel i is greater than or equal to the first threshold; the proportion of resource blocks other than the guard band PRB in subchannel i in all resource blocks included in subchannel i is greater than or equal to the second threshold; the code rate of the side control information corresponding to the resources other than the guard band PRB in subchannel i is less than or equal to the third threshold.

For a specific method of determining the first frequency domain resource in subchannel i+1 and subchannel i, reference may be made to the description of situation 3 in S102.

Exemplarily, as shown in FIG6 , if the PRBs other than the guard band PRBs on subchannel 5 are insufficient to carry PSCCH, the first terminal device may carry PSCCH on the PRBs other than the guard band PRBs in subchannel 5 and on some PRBs in subchannel 6. For example, assuming that the subchannel includes 10 PRBs, there are 7 PRBs in the guard band of subchannel 5, and the number of PRBs occupied by PSCCH configured by the network device is 8, the first device may carry PSCCH on 3 PRBs other than the guard band PRBs in subchannel 5 and 5 PRBs in subchannel 6. In this way, it can be ensured that PSCCH occupies sufficient PRBs to prevent decoding failures caused by excessively high PSCCH code rates.

As another example, as shown in Figure 7, if the PRBs other than the guard band PRBs on subchannel 5 are insufficient to carry the PSCCH, the first terminal device can carry the PSCCH on the PRBs other than the guard band PRBs in subchannel 5 and all the PRBs in subchannel 6.

Alternatively, in one case, if the resources other than the guard band PRB in the subchannel i meet the second condition, the first frequency domain resource is the frequency domain resource in the subchannel i. In other words, the first device determines a frequency domain resource in the subchannel i as the first frequency domain resource. Optionally, the resource satisfies the second condition, which can also be understood as the resource not satisfying the first condition. Similarly, the resource satisfies the first condition, which can be understood as not satisfying the second condition. For a specific method of determining the first frequency domain resource in subchannel i+1, reference can be made to the description of case 1 or 4 in S102.

Optionally, the second condition includes one of the following conditions: the number of resource blocks other than the guard band PRB in subchannel i is greater than or equal to the first threshold, the proportion of resource blocks other than the guard band PRB in subchannel i in all resource blocks included in subchannel i is greater than or equal to the second threshold, and the code rate of the side control information corresponding to the resources other than the guard band PRB in subchannel i is less than or equal to the third threshold. Meeting the second condition means that the resources other than the guard band PRB in subchannel i are sufficient for transmitting PSCCH. In this case, the first device can carry PSCCH in subchannel i. For the specific method of determining the first frequency domain resources in subchannel i+1 and subchannel i, refer to the description of Case 1 and Case 4 in S102.

It can also be understood that if the resources other than the guard band PRB in the sub-channel i do not meet the first condition, the first frequency domain resources are the frequency domain resources in the sub-channel i.

Exemplarily, as shown in FIG8 , resources other than the guard band PRB on subchannel 5 are sufficient for transmitting PSCCH, then the first device determines a first frequency domain resource from the PRB of subchannel 5 and sends PSCCH on the first frequency domain resource.

S102. The first device sends sidelink control information on a first frequency domain resource.

Correspondingly, the second device receives the sidelink control information on the first frequency domain resource.

The first device sends the sidelink control information on the first frequency domain resources, which can also be expressed as: sending the PSCCH on the first frequency domain resources.

Compared with the related art in which PSCCH fixedly occupies the PRB in subchannel i, in the embodiment of the present application, the first device can flexibly determine to transmit PSCCH in subchannel i and/or subchannel i+1 according to the conditions, thereby improving communication flexibility, and can ensure the number of resources used to transmit PSCCH as much as possible, thereby improving the transmission reliability of PSCCH and thus improving the success rate of data decoding.

The first device sends the side control information on the first frequency domain resource, which can be implemented as follows: the first device maps the PSCCH to the first frequency domain resource and sends the PSCCH on the first frequency domain resource. Or the resource for the first device to send the side control information is the first frequency domain resource. The mapping starting point of the side control information can be understood as the starting position of the first frequency domain resource or the starting PRB of the first frequency domain resource. The mapping end point of the side control information can be understood as the ending position of the first frequency domain resource or the ending PRB of the first frequency domain resource.

The embodiment of the present application provides a new resource mapping rule under the influence of the guard band PRB. The resource mapping method is introduced in different situations as follows:

Case 1: The first frequency domain resource used to carry the PSCCH is the frequency domain resource in subchannel i.

The mapping starting point of the side control information is the PRB with the smallest index in subchannel i excluding the guard band PRB. Or it can be understood that the starting position of the first frequency domain resource is the PRB with the smallest index in subchannel i excluding the guard band PRB.

In the embodiment of the present application, the PRB with the smallest index can be understood as the PRB with the lowest index or the PRB with the lowest frequency domain index or the PRB with the lowest frequency domain.

The mapping end point of the sideline control information is determined according to the mapping start point and mapping length of the sideline control information, or the mapping end point of the sideline control information is the PRB with the largest index in subchannel i. Or it is understood that the end position of the first frequency domain resource is determined according to the starting position of the first frequency domain resource and the number of resources of the sideline control information, or the end position of the first frequency domain resource is the PRB with the largest index in subchannel i.

In the embodiment of the present application, the PRB with the largest index can be understood as the PRB with the highest index or the PRB with the highest frequency domain index or the PRB with the highest frequency domain.

In the embodiment of the present application, the mapping length can be understood as the number of PRBs used by the PSCCH. The mapping length can be configured or preconfigured by the network device. The mapping length can also be a preset value, a predefined value, or a fixed value.

In an embodiment of the present application, the starting position of the frequency domain resource may be understood as the starting PRB of the frequency domain resource, and the ending position of the frequency domain resource may be understood as the ending PRB of the frequency domain resource. The mapping starting point of the side control information may be understood as the starting position of the first frequency domain resource or the starting PRB of the first frequency domain resource. The mapping end point of the side control information may be understood as the ending position of the first frequency domain resource. Among them, the ending position may be understood as the ending PRB or the ending position or the ending PRB or the highest PRB indexed or the highest PRB or the maximum PRB or the maximum PRB indexed.

For example, it is assumed that the number of configured PRBs of PSCCH is 6, as shown in FIG9(a), subchannel i is subchannel 5, and subchannel The total number of PRBs in subchannel 5 is 10, and there are 3 guard band PRBs (PRB0-PRB2) in subchannel 5. The PRBs (7 PRBs) other than the guard band PRBs in subchannel 5 are sufficient to carry the PSCCH.

In some designs, as shown in (a) of FIG. 9 , when PRBs other than the guard band PRBs in subchannel 5 are sufficient to carry the PSCCH, the first device may map 6 PRBs (PRB3-PRB8) continuously starting from PRB3 (the PRB with the lowest index other than the guard band PRBs) of subchannel 5, and send the PSCCH on the mapped 6 PRBs. Here, the mapping end point of the PSCCH is determined according to the mapping start point and mapping length of the PSCCH.

In some designs, as shown in FIG9( b ), the first device may continuously map the PSCCH starting from PRB3 of subchannel 5 until the mapping of the PSCCH ends at PRB9 with the largest index in subchannel 5. Here, the mapping end point of the PSCCH is the PRB with the largest index in subchannel 5.

Case 2: corresponding to the case where the PRB in subchannel i satisfies the first condition (does not satisfy the second condition), the PRBs in subchannel i other than the guard band PRBs are insufficient for transmitting the PSCCH. In this case, the first frequency domain resource for carrying the PSCCH may be the frequency domain resource in subchannel i+1.

The mapping starting point of the side control information is the PRB with the smallest index in the subchannel i+1. Or it can be understood that the starting position of the first frequency domain resource is the PRB with the smallest index in the subchannel i+1.

The mapping end point of the side control information is determined according to the mapping start point and mapping length of the side control information, or the mapping end point of the side control information is the PRB with the largest index in subchannel i+1. Among them, the mapping end point is the PRB with the largest index in subchannel i+1, which can also be understood as the mapping length is the PRB included in subchannel i+1. Or it can be understood that the end position of the first frequency domain resource is determined according to the starting position of the first frequency domain resource and the number of resources of the side control information, or the end position of the first frequency domain resource is the PRB with the largest index in subchannel i+1.

Alternatively, the mapping end point of the side control information is the PRB determined according to the mapping start point and mapping length of the side control information, and the PRB with the largest index in subchannel i+1, and the PRB with a smaller index. Or it can be understood that the end position of the first frequency domain resource is the PRB determined according to the starting position of the first frequency domain resource and the number of resources of the side control information, and the PRB with the largest index in subchannel i+1, and the PRB with a smaller index.

Exemplarily, assuming that the number of configured PRBs for PSCCH is 8, as shown in (c) of FIG9 , subchannel i is subchannel 5, the total number of PRBs in subchannel 5 is 10, and there are 3 guard band PRBs (PRB0-PRB2) in subchannel 5. The PRBs (7 PRBs) other than the guard band PRBs in subchannel 5 are not sufficient to carry PSCCH.

In some designs, as shown in FIG9(c), when the PRB of subchannel 5 is insufficient to carry the PSCCH, the first device may map the PSCCH on 8 PRBs (PRB0-PRB7) starting from PRB0 of subchannel 6 (the PRB with the lowest index in subchannel 6), and send the PSCCH on the mapped 8 PRBs of subchannel 6. Here, the mapping end point of the PSCCH is determined according to the mapping start point and mapping length of the PSCCH.

In some designs, as shown in (d) of FIG. 9 , when the PRB of subchannel 5 is insufficient to carry the PSCCH, the first device may continuously map the PSCCH starting from PRB0 of subchannel 6 until the PRB9 with the largest index in subchannel 6 ends mapping the PSCCH. Here, the mapping end point of the PSCCH is the PRB with the largest index in subchannel 6.

Case 3: corresponding to the case where the PRB in subchannel i satisfies the first condition (does not satisfy the second condition), the PRBs in subchannel i other than the guard band PRBs are insufficient for transmitting the PSCCH. In this case, the first frequency domain resource for carrying the PSCCH may be the frequency domain resource in subchannel i and subchannel i+1.

The first device starts mapping the PSCCH from the mapping starting point of the sideline control information, and the mapping length is N. N is the number of PRBs used by the PSCCH. The mapping length can be configured or preconfigured by the network device. The mapping length can also be a preset value, a predefined value, or a fixed value.

Alternatively, the mapping end point of the side control information is determined based on the mapping start point and mapping length of the side control information, or the mapping end point of the side control information is the PRB with the largest index in subchannel i+1. Among them, the mapping end point of the side control information is the PRB with the largest index in subchannel i+1, which can be understood as the mapping length is the remaining PRBs in subchannel i and all PRBs in subchannel i+1. Or it can be understood that the end position of the first frequency domain resource is determined based on the starting position of the first frequency domain resource and the number of resources of the side control information, or the end position of the first frequency domain resource is the PRB with the largest index in subchannel i+1.

That is, the PRBs available for transmitting the PSCCH include the remaining PRBs in subchannel i and all or part of the PRBs in subchannel i+1. Partial PRBs. The remaining PRBs in subchannel i are the PRBs in subchannel i excluding the guard band PRBs.

Exemplarily, assuming that the number of configured PRBs for PSCCH is 8, as shown in (e) of FIG9 , subchannel i is subchannel 5, the total number of PRBs in subchannel 5 is 10, and there are 3 guard band PRBs (PRB0-PRB2) in subchannel 5. The PRBs (7 PRBs) other than the guard band PRBs in subchannel 5 are not sufficient to carry PSCCH.

In some designs, as shown in (e) of FIG. 9 , when the PRB of subchannel 5 is insufficient to carry the PSCCH, the first device may continuously map the PSCCH starting from PRB3 of subchannel 5 (the PRB with the lowest index except the guard band PRB in subchannel 5) until the mapping of the PSCCH ends at PRB9 with the largest index in subchannel 6, and sends the PSCCH on the mapped resources of the two adjacent subchannels. Here, the mapping end point of the PSCCH is the PRB with the largest index in subchannel 6.

In some designs, as shown in (f) of FIG9 , when the PRB of subchannel 5 is insufficient to carry the PSCCH, the first device may start continuous mapping from PRB3 of subchannel 5 and end mapping at PRB0 of subchannel 6, mapping a total of 8 PRBs. Or as shown in (g) of FIG9 , end at the PRB with the largest index in subchannel 5. Here, the mapping end point of the PSCCH is determined according to the mapping start point and mapping length of the PSCCH.

Case 4: the first frequency domain resource is the frequency domain resource in subchannel i.

The mapping end point of the side control information is the PRB with the smaller index between the first PRB and the second PRB, the first PRB is the PRB with the largest index in subchannel i, and the second PRB is the PRB determined according to the mapping start point and mapping length of the side control information. That is, the PSCCH is located in subchannel i, and only the PRBs in subchannel i can be used. Or it can be understood that the end position of the first frequency domain resource is the PRB with the smaller index between the first PRB and the second PRB, the first PRB is the PRB with the largest index in subchannel i, and the second PRB is the PRB determined according to the starting position of the first frequency domain resource and the number of resources of the side control information.

Exemplarily, assuming that the number of configured PRBs of PSCCH is 6, as shown in (a) of FIG. 9 , subchannel i is subchannel 5, and there are 3 guard band PRBs (PRB0-PRB2) in subchannel 5. The first device can continuously map PSCCH starting from PRB3 of subchannel 5 and end mapping at PRB8. The first device sends PSCCH on the 6 PRBs.

As another example, assume that the number of configured PRBs for PSCCH is 8, as shown in (b) of FIG9 , subchannel i is subchannel 5, and there are 3 guard band PRBs (PRB0-PRB2) in subchannel 5. The first device continuously maps PSCCH from PRB3 of subchannel 5 and ends mapping at PRB9. The PRBs used by the first device to send PSCCH are all PRBs in subchannel 5. PRBs in subchannels other than subchannel 5 cannot be used to transmit PSCCH.

Through the resource mapping method of the embodiment of the present application, it can be ensured that the PSCCH does not use the guard band PRB and the number of available PRBs of the PSCCH is maximized, thereby improving the transmission reliability of the PSCCH.

Optionally, considering that the first device sends PSSCH in multiple subchannels starting from subchannel i, since the first device may only send PSCCH in subchannel i+1, the subchannel i+1 occupied by PSCCH may not be the subchannel i with the lowest index among the subchannels occupied by PSSCH. The transmitting end may choose to use or not use subchannel i+1 to transmit PSSCH. Correspondingly, the subchannel i+1 where the receiving end successfully detects PSCCH may not be the subchannel i with the lowest index among the subchannels occupied by PSSCH. In the time-frequency resource indication method of the related technology, the subchannel where the receiving end detects PSCCH is the subchannel with the lowest index among the subchannels occupied by PSSCH. When the transmitting end occupies subchannel i and PSCCH is carried on subchannel i+1, in order to avoid the receiving end mistakenly treating the subchannel i+1 where PSCCH is successfully detected as the subchannel with the lowest index occupied by PSCCH. The first device can send indication information to enable the receiving end to know whether the first device occupies subchannel i to transmit PSSCH. As shown in FIG. 4A , optionally, the communication method in the embodiment of the present application may further include one or more steps of S103-S105:

S103. The first device sends side data information.

Exemplarily, the first device sends the sideline data information in the first subchannel set. It can also be understood here that the first device sends the sideline control information and the sideline data information corresponding to the sideline control information in the first subchannel set.

Correspondingly, the second device receives the sideline data information. It can also be understood here that the second device receives the sideline control information and the sideline data information corresponding to the sideline control information in the first subchannel set.

S104: The first device sends indication information.

Correspondingly, the second device receives the indication information.

The indication information is used to indicate whether the sidelink data information occupies the subchannel including the guard band PRB in the RB set, or to indicate whether the PSSCH occupies the subchannel including the guard band PRB, or to indicate whether the subchannel detected by the PSCCH is The subchannel with the lowest index among the subchannels occupied by PSSCH, or the adjacent subchannel in the lower frequency domain of the subchannel where PSCCH is detected is occupied by PSSCH, or the indication information is used to indicate that the subchannel where PSCCH is detected is the subchannel with the lowest index or the subchannel with the second lowest index among the subchannels occupied by PSSCH. The specific indication content of the indication information is not limited here, as long as the second device can determine the resource location for receiving PSSCH according to the indication information.

In the embodiment of the present application, the second lowest index can also be replaced by the second lowest index, can also be replaced by the second lowest (or second lowest) in the frequency domain, or can be replaced by the second lowest (or second lowest) in the frequency domain, etc.

In the embodiment of the present application, the subchannel including the guard band PRB in the RB set may be the first subchannel including the guard band PRB and the PRB in the RB set starting from the subchannel with the lowest index in the RB set. For example, as shown in FIG5 , the subchannel including the guard band in RB set1 refers to subchannel 5 in RB set1.

In the embodiment of the present application, the subchannel including the guard band PRB is subchannel i.

Optionally, the index of the subchannel including the guard band PRB is not higher than the index of the subchannel carrying the sideline control information. Exemplarily, as shown in FIG5 , the subchannel including the guard band PRB is subchannel 5, and the subchannel carrying the PSCCH is subchannel 6. The index of subchannel 5 is lower than the index of subchannel 6.

In an embodiment of the present application, the index of the subchannel including the guard band PRB is not higher than the index of the subchannel carrying the sideline control information, which can be understood as the index of the subchannel including the guard band PRB is lower than or equal to the index of the subchannel carrying the sideline control information.

Exemplarily, as shown in FIG5 , it is assumed that the first device sends a PSCCH to the second device on subchannel 6 (shown by a box marked with black). The first device sends a PSSCH to the second device on subchannels 5-8 (shown by a box marked with dots), where subchannel 5 includes a guard band PRB (shown by a box marked with slashes). The first device may send indication information to the second device to indicate that the PSSCH occupies subchannel 5 including the guard band PRB.

Optionally, the first device may carry indication information in the SCI associated with the PSSCH. For example, the first device carries the indication information in the first-level SCI, or the indication information is carried in the second-level SCI. Optionally, the indication information is 1 bit. 1 bit indicates a first value and a second value, the first value is used to indicate that the PSSCH occupies a subchannel including a guard band PRB, and the second value is used to indicate that the PSSCH does not occupy a subchannel including a guard band PRB. For example, the first value is "1" and the second value is "0", and vice versa. Exemplarily, if the indication information is carried in the second-level SCI, the above S103 and S104 can be one step. The first device sends a PSSCH, and the PSSCH carries the indication information.

In some examples, when the subchannel occupied by the PSSCH includes a "subchannel including a guard band PRB", the frequency domain length indicated by the FRIV field does not include the "subchannel including a guard band PRB". It can be understood that the frequency domain starting point corresponding to the frequency domain length indicated by the FRIV field is the subchannel where the PSCCH is detected. The first device indicates the subchannel occupied by the PSSCH using the indication information and the FRIV field. The receiving end determines the subchannel occupied by the PSSCH based on the indication information and the FRIV field. For example, as shown in Figure 5, the PSSCH occupies subchannels 5-8, and the FRIV field indicates subchannels 6-8. The indication information indicates that the PSSCH occupies subchannel 5 including the guard band PRB. The receiving end can determine that the PSSCH occupies subchannels 5-8 based on the indication information and the FRIV field. For another example, the indication information indicates that the PSSCH does not occupy the subchannel including the guard band PRB, the FRIV field indicates subchannels 6-8, and the PSSCH occupies subchannels 6-8.

In the embodiment of the present application, the sub-channel including the guard band PRB may be the above-mentioned sub-channel i.

Optionally, the first device may also indicate the resource location of the PSSCH through the FRIV field. It can be understood that the indication information is the information indicated by the frequency domain resource assignment (FRIV) field. The FRIV field is used to indicate the frequency domain resources of the PSSCH. For example, the FRIV field indicates the frequency domain starting position of the PSCCH, or is used to indicate the frequency domain starting position and frequency domain length of the frequency domain resources. As a possible implementation method, the frequency domain starting point corresponding to the frequency domain length indicated by the FRIV field is the subchannel including the guard band PRB. That is, the adjacent subchannel with a lower frequency domain of the subchannel where the PSCCH is located. At this time, the indication information is used to indicate whether the frequency domain length should include the subchannel of the guard band PRB. For example, PSSCH occupies subchannels 5-8. PSCCH occupies subchannel 6. The FRIV field indicates that the frequency domain length is subchannels 5-8. The indication information indicates whether the frequency domain length includes subchannel 5. The receiving end can determine that the PSCCH occupies subchannels 5-8 according to the FRIV field.

Optionally, if the subchannel occupied by PSCCH is not the subchannel with the lowest index among the subchannels occupied by PSSCH, the first device sends an indication message. Exemplarily, if the subcarrier spacing (SCS) is high, in order to meet OCB, the first device occupies as many subchannels as possible to transmit PSSCH. As shown in Figure 17, the first device occupies subchannels 5-9 to transmit PSSCH and occupies subchannel 6 to transmit PSCCH. The subchannel occupied by PSCCH is not the subchannel with the lowest index among the subchannels occupied by PSSCH. In this case, the first device may send indication information.

Or, optionally, if the subchannel occupied by the PSCCH is not the subchannel with the lowest index among the subchannels occupied by the PSSCH, or if the subchannel occupied by the PSCCH is the subchannel with the lowest index among the subchannels occupied by the PSSCH, the first device may send indication information.

S105. The second device decodes the sideline data information according to the indication information.

After the second device receives the indication information, it can determine whether the PSSCH occupies a subchannel including a guard band PRB according to the indication information. In some examples, if the PSSCH occupies a subchannel including a guard band PRB, the second device uses the subchannel including the guard band PRB as the subchannel with the lowest index occupied by the PSSCH, and receives and decodes the PSCCH in the subchannel occupied by the PSSCH. In some examples, if the PSSCH does not occupy a subchannel including a guard band PRB, the second device determines that the subchannel where the PSCCH is detected is the subchannel with the lowest index among the subchannels occupied by the PSSCH, and receives and decodes the PSSCH in the subchannel occupied by the PSSCH.

Exemplarily, as shown in FIG5 , the second device receives indication information from the first device, which indicates that the PSSCH occupies subchannel 5 of RB set 1. Then, the second device can use subchannel 5 as the subchannel with the lowest index occupied by the PSSCH according to the indication information, and receive and decode the PSSCH on subchannel 5 occupied by the PSSCH and subchannel 6 (the subchannel that successfully blindly detects the PSCCH).

In this way, it is possible to avoid misunderstanding of PSSCH resource usage caused by the receiving end blindly detecting the PSCCH subchannel as the lowest index subchannel occupied by PSSCH, thereby improving the probability of successful decoding of PSSCH.

In addition, since some devices use sub-channels including guard band PRBs to transmit PSSCH, and some devices do not use sub-channels including guard band PRBs to transmit PSSCH, the probability of resource conflicts between devices can be reduced by having the device send indication information to indicate whether it uses the sub-channel including guard band PRBs.

Optionally, as shown in FIG. 4A , the method of the embodiment of the present application may further include:

S106: The first device executes a listen-before-speak (LBT) process to obtain a first COT.

The first device performs LBT to access the first channel, and the time domain range corresponding to the first channel can be called the first COT. The first channel can be one or more. The frequency domain range corresponding to the first COT is the first channel. The frequency domain resources corresponding to the first COT include the first frequency domain resources. That is, the first channel includes the first frequency domain resources.

Exemplarily, as shown in FIG1B , the first device performs LBT, accesses RB set 1 and RB set 2, and occupies the first COT. The time domain length corresponding to the first COT is L, and the frequency domain resources corresponding to the first COT include the first frequency domain resources.

After the first device accesses the first channel, it can determine resources for transmitting the PSSCH (or transmitting the PSCCH and the PSSCH associated with the PSCCH) in the first channel as a first sub-channel set.

The embodiment of the present application also provides a communication method, in which the first device can map the PSCCH from the first subchannel set or the PRB with the lowest index in the first channel except the guard band PRB according to the number of PSCCH resources, and continuously map X PRBs, which are used to carry the PSCCH to meet the transmission requirements of the PSCCH. As shown in Figure 10, the method includes:

S301. A first device determines a first frequency domain resource.

The starting position of the first frequency domain resource is the PRB with the lowest index in the first subchannel set except the guard band PRB; the first subchannel set is the subchannel occupied by the sideline data information associated with the sideline control information. The starting position of the first frequency domain resource can be the starting PRB or the starting point of the PRB or the lowest PRB in the frequency domain of the first frequency domain resource. The PRB with the lowest index is the lowest PRB in the frequency domain or the lowest PRB.

Optionally, the first subchannel set includes subchannel i and subchannel i+1. Subchannel i is the subchannel with the lowest index in the first subchannel set (the subchannel with the lowest index is the lowest subchannel or the subchannel with the lowest frequency domain); the first subchannel set is the subchannel occupied by the sideline data information associated with the sideline control information; i is an integer greater than or equal to 0.

The starting position of the first frequency domain resource is the PRB with the lowest index in the first subchannel set except the guard band physical resource block PRB. It can be understood that the starting position of the first frequency domain resource is the PRB with the lowest index in subchannel i except the guard band PRB.

In an embodiment of the present application, the first device continuously maps X PRBs according to the number of resources of the PSCCH, where X is a positive integer. It can be understood that the number of PRBs included in the first frequency domain resource is X. It can be understood that the mapping length is X PRBs. In an embodiment of the present application, the X PRBs are frequency domain resources in subchannel i, or the X PRBs include part of the frequency domain resources in subchannel i and part or all of the frequency domain resources in subchannel i+1, and subchannel i+1 is a subchannel in the first subchannel set.

In the embodiment of the present application, X is the number of resources for the sideline control information. In other words, the first device removes the protection information from the subchannel i. Starting from the PRB with the lowest index outside the guard band PRB (denoted as PRB i), the mapping is continued in ascending order of the PRB index and the mapping stops at PRB i+X-1.

Exemplarily, it is assumed that the number of configured PRBs of PSCCH is 6, as shown in (a) of Figure 11, subchannel i is subchannel 5, the total number of PRBs in subchannel 5 is 10, and there are 3 guard band PRBs (PRB0-PRB2) in subchannel 5. The first device starts mapping PSCCH from the PRB (PRB3) with the lowest index except the guard band PRB in subchannel 5, and ends mapping at PRB8 of subchannel 5. Here, the number of PRBs mapped by PSCCH is the number of configured PRBs of PSCCH, which is 6. In this way, it can be ensured that the number of PRBs used to carry PSCCH is sufficient, and the transmission performance of PSCCH is guaranteed.

As another example, as shown in (c) of FIG. 11 , it is assumed that the number of configured PRBs of the PSCCH is 8, subchannel i is subchannel 5, the total number of PRBs in subchannel 5 is 10, and there are 3 guard band PRBs (PRB0-PRB2) in subchannel 5. The first device starts mapping the PSCCH from the PRB (PRB3) with the lowest index except the guard band PRBs in subchannel 5, and ends mapping at PRB0 of subchannel 6. Here, the number of PSCCH mapped PRBs is the number of configured PRBs of the PSCCH, 8.

In the embodiment of the present application, X may be greater than the number of resources of the sideline control information. Optionally, the mapping end point of the PSCCH is the PRB with the largest index in subchannel i or the PRB with the largest index in subchannel i+1.

Exemplarily, as shown in (b) of FIG11 , it is assumed that the number of configured PRBs of PSCCH is 6, subchannel i is subchannel 5, the total number of PRBs in subchannel 5 is 10, and there are 3 guard band PRBs (PRB0-PRB2) in subchannel 5. The first device starts mapping PSCCH from the PRB (PRB3) with the lowest index except the guard band PRBs in subchannel 5, and ends mapping at PRB9 of subchannel 5. Here, the number of PRBs mapped by PSCCH (7) is greater than the number of configured PRBs of PSCCH (6). In this way, the number of PRBs used to carry PSCCH can be increased as much as possible, thereby improving the transmission performance of PSCCH.

As another example, as shown in (d) of FIG. 11 , it is assumed that the number of configured PRBs of the PSCCH is 8, subchannel i is subchannel 5, the total number of PRBs in subchannel 5 is 10, and there are 3 guard band PRBs (PRB0-PRB2) in subchannel 5. The first device starts mapping the PSCCH from the PRB (PRB3) with the lowest index except the guard band PRBs in subchannel 5, and ends mapping at PRB9 of subchannel 6. Here, the number of PSCCH mapped PRBs (17) is greater than the number of configured PRBs of the PSCCH (8).

S302. The first device sends sidelink control information on a first frequency domain resource.

Optionally, before S301, as shown in FIG10, the method further includes S303 and S304:

S303: The first device performs channel access in unlicensed spectrum resources.

Executing channel access may be understood as executing a channel access process, or executing LBT to access the first channel. For the specific execution method, reference may be made to the description in S106.

S304. The first device determines a first sub-channel set in the first channel accessed. The first channel is a resource in an unlicensed spectrum. The first channel includes one or more RB sets.

The first subchannel set is used to transmit the PSCCH and the PSSCH associated with the PSCCH.

The embodiment of the present application also provides a communication method, in which a first device sends side control information in a subchannel that does not include a guard band PRB, so as to avoid decoding failure caused by sending side control information in a subchannel that includes more guard band PRBs in certain scenarios. As shown in Figure 12, the method includes:

S401. A first device determines a first frequency domain resource.

The first frequency domain resource may be determined in at least one of the following ways:

Mode 1: The first frequency domain resource is the frequency domain resource in the first subchannel; the first subchannel is the subchannel with the smallest index (or the lowest subchannel, or the subchannel with the lowest frequency domain) in the first subchannel set excluding the subchannel including the protection band PRB; the first subchannel set is the subchannel occupied by the sidelink data information associated with the sidelink control information.

In other words, the subchannel used to carry the PSCCH is the subchannel with the smallest index that does not include the guard band PRB in the subchannel occupied by the PSSCH associated with the PSCCH. This means that in the subchannel with the smallest index among the subchannels occupied by the PSSCH, when the number of remaining PRBs is small due to the existence of the guard band PRB, the first device will not determine whether the number of remaining PRBs in the subchannel is sufficient to carry the PSCCH, but directly does not use the subchannel to carry the PSCCH, and uses the subchannel with the smallest index outside the subchannel in the first subchannel set to carry the PSCCH.

Exemplarily, as shown in FIG13 , assuming that the first subchannel set includes subchannels 5-9, the subchannel i with the lowest index in the first subchannel set is subchannel 5. The subchannels that do not include the guard band PRB in the first subchannel set include subchannels 6-9, and the first device determines to carry the PSCCH in the subchannel 6 with the lowest index in subchannels 6-9.

As another example, as shown in FIG. 14 , the first device determines that the guard band PRB is not included in the first subchannel set, and the subchannel 5 with the lowest index carries the PSCCH.

Optionally, if subchannel i includes a guard band PRB, the first subchannel is subchannel i+1; if subchannel i does not include a guard band PRB, the first subchannel is subchannel i.

Exemplarily, as shown in Figure 13, assuming that the first subchannel set includes subchannels 5-9, the subchannel i with the lowest index in the first subchannel set is subchannel 5, and the first device determines that subchannel 5 includes a guard band PRB (shown by a box marked with slashes), then the first device determines not to use subchannel 5, but instead determines in subchannel 6 a first frequency domain resource for carrying PSCCH (shown by a box marked with black).

As another example, as shown in FIG. 14 , subchannel i is subchannel 5, and the first device determines that subchannel 5 does not include a guard band PRB, then the first device determines a first frequency domain resource in subchannel 5 for carrying PSCCH (shown as a black box).

Optionally, if the SCS is low, the first device may meet the OCB by occupying fewer subchannels, or the area or region where the first device is located has no OCB demand. In this case, the subchannel including the guard band PRB is not used to transmit the PSSCH. Alternatively, in this case, the first device may transmit the PSSCH on the subchannel including the guard band PRB, and the first device sends indication information to indicate whether the PSSCH occupies the subchannel including the guard band PRB. For a specific description of the process, please refer to S104 and S105.

Optionally, the starting position of the first frequency domain resource may be a PRB with the smallest index in the first subchannel.

Optionally, the termination position of the first frequency domain resource may be determined according to the number of PSCCH resources. Alternatively, the termination position of the first frequency domain resource may be the PRB with the largest index in the first subchannel.

Mode 2: The first device may be configured to transmit the PSCCH on part of the frequency domain resources in subchannel i and part or all of the frequency domain resources in subchannel i+1. The first frequency domain resources include part of the frequency domain resources in subchannel i and part or all of the frequency domain resources in subchannel i+1. Subchannel i and subchannel i+1 are subchannels in the first subchannel set. Subchannel i is the subchannel with the smallest index in the first subchannel set.

In this implementation, the first device does not determine whether subchannel i includes a guard band PRB, but directly occupies part or all of the PRBs in subchannel i and part or all of the PRBs in subchannel i to transmit the PSCCH.

Taking subchannel i including a guard band PRB as an example, illustratively, still as shown in Figure 6, subchannel i is subchannel 5, and the first device sends PSCCH on PRBs other than the guard band PRBs in subchannel 5 (shown by black boxes) and part or all of the PRBs in subchannel 6 (shown by black boxes).

Taking subchannel i not including the guard band PRB as an example, illustratively, as shown in Figure 15, subchannel i is subchannel 5, and the first device sends PSCCH on the PRB of subchannel 5 (shown by the black box) and part or all of the PRB of subchannel 6 (shown by the black box).

Optionally, the starting position of the first frequency domain resource is the lowest PRB except the guard band PRB in subchannel i. It can be understood that the starting PRB of the first frequency domain resource is the lowest PRB except the guard band PRB in the lowest subchannel occupied by PSSCH.

Optionally, the end position of the first frequency domain resource is the PRB with the largest index in subchannel i+1. It can be understood that the end PRB of the first frequency domain resource is the highest PRB in subchannel i+1.

Exemplarily, as shown in (c) of FIG. 16 , subchannel 5 (an example of subchannel i) does not include a guard band PRB, and the starting position of the first frequency domain resource (shown by a square marked with slashes) is PRB0 with the lowest index in subchannel 5. The ending position of the first frequency domain resource is PRB9 with the largest index in subchannel 6.

16( d ), subchannel 5 includes a guard band PRB, and the starting position of the first frequency domain resource is PRB3 with the lowest index except the guard band PRB in subchannel 5. The ending position of the first frequency domain resource is PRB9 in subchannel 6.

Alternatively, optionally, the termination position of the first frequency domain resource is determined according to the number of PSCCH resources. Or the mapping length of the PSCCH is the number of PSCCH resources. The number of the first frequency domain resources is equal to the number of PSCCH resources. The termination position of the first frequency domain resource is the PRB in subchannel i+1.

Alternatively, optionally, the end position of the first frequency domain resource is determined according to the number of PSCCH resources. Alternatively, the mapping length of the PSCCH is the number of PSCCH resources. The number of the first frequency domain resources is equal to the number of PSCCH resources. The end position of the source is the PRB in the subchannel i. Optionally, the specific execution process may refer to S301 or other related steps.

Exemplarily, assuming that the number of PSCCH resources is 8, as shown in (b) of Figure 16, the starting position of the first frequency domain resource is PRB3 of subchannel 5, the ending position of the first frequency domain resource is PRB0 of subchannel 6, and the number of first frequency domain resources is equal to the number of PSCCH resources.

As another example, it is still assumed that the number of PSCCH resources is 8, as shown in (a) of Figure 16, the starting position of the first frequency domain resource is PRB0 of subchannel 5, the ending position of the first frequency domain resource is PRB0 of subchannel 6, and the number of first frequency domain resources is greater than the number of PSCCH resources. In this way, while ensuring that the number of PRBs used to carry PSCCH is sufficient, as few PRBs in subchannel i+1 as possible are occupied to transmit PSCCH, so that the remaining PRBs in subchannel i+1 can be used to transmit other information, thereby improving resource utilization.

Or, in other examples, the starting position of the first frequency domain resource is PRB0 of subchannel 5, and the ending position of the first frequency domain resource is PRB9 of subchannel 6. In this way, the number of PRBs used to carry PSCCH can be increased, and the transmission performance of PSCCH can be improved.

Mode 3: The first device is configured to send side control information on subchannel i+1. The first frequency domain resource is a frequency domain resource in subchannel i+1; subchannel i+1 is a subchannel in a first subchannel set, subchannel i is a subchannel with the smallest index in the first subchannel set, and subchannel i includes a guard band PRB. The first subchannel set is a subchannel occupied by side data information associated with the side control information.

This means that when subchannel i includes a guard band PRB, the first device does not need to determine whether the guard band PRB included in subchannel i is sufficient, but directly does not use subchannel i to carry PSCCH, and uses subchannel i+1 to carry PSCCH.

Exemplarily, still as shown in FIG5 , subchannel 5 (an example of subchannel i) includes a guard band PRB, and the first device sends a PSCCH on the first frequency domain resource of subchannel 6. As shown in FIG17 , subchannel 5 does not include a guard band PRB, and the first device also sends a PSCCH on the first frequency domain resource of subchannel 6.

Optionally, the starting position of the first frequency domain resource may be the PRB with the smallest index in subchannel i+1.

Optionally, the end position of the first frequency domain resource can be determined according to the number of PSCCH resources, or the PRB with the largest index in subchannel i+1.

S402. The first device sends sidelink control information on a first frequency domain resource.

Corresponding to the first frequency domain resources including part of the frequency domain resources in subchannel i and part or all of the frequency domain resources in subchannel i+1, this method can avoid using the subchannel including the guard band PRB to transmit PSCCH by sending the PSCCH on the subchannel that does not include the guard band PRB, and will not cause the problem of increased code rate due to too few available PRBs.

Corresponding to the first frequency domain resources including part of the frequency domain resources in subchannel i and part or all of the frequency domain resources in subchannel i+1, in this method, the first device can occupy the frequency domain resources of two subchannels to send PSCCH, which can increase the number of PRBs used to carry PSCCH, thereby improving the transmission performance of PSCCH.

Corresponding to the first frequency domain resource being the frequency domain resource in subchannel i+1, in this method, the first device does not need to determine whether the protection band PRB included in subchannel i is sufficient, and directly sends the side control information on the first frequency domain resource of subchannel i+1. On the one hand, it can reduce the computing power consumption of the first device, and on the other hand, it can ensure the number of available resources for the side control information and improve the transmission performance of the side control information.

Optionally, as shown in FIG12 , the method may further include: S403 , the first device obtains configuration information.

The configuration information is used to indicate that the sidelink control information is carried on the subchannel with the smallest index in the subchannel that does not include the guard band PRB in the first subchannel set, or is used to indicate that the sidelink control information is carried on subchannel i and subchannel i+1 in the first subchannel set, or is used to indicate that the sidelink control information is carried on subchannel i+1, or is used to indicate that the sidelink control information is carried on the lowest subchannel that does not include the guard band PRB. In this way, the first device can obtain the subchannel used by the sidelink control information according to the configuration information, and send the sidelink control information in the first frequency domain resource of the subchannel according to the configuration information to improve the transmission reliability of the sidelink control information.

Optionally, the configuration information may be pre-configured by the first device, such as pre-defined, or the configuration information may be configured by a network device.

In the embodiment of the present application, optionally, as shown in FIG12 , the method may further include:

S404: The first device sends side data information.

Exemplarily, the first device sends the sidelink data information in the first subchannel set. The sidelink control information and the sidelink data information corresponding to the sidelink control information are sent in the first subchannel set.

S405: The first device sends indication information.

Correspondingly, the second device receives the indication information.

The indication information is used to indicate whether the side data information occupies subchannel i, or is understood to be used to indicate whether the side data information occupies a subchannel including a guard band PRB, or is used to indicate whether the subchannel where the PSCCH is detected is the subchannel with the lowest index among the subchannels occupied by the PSSCH. The specific indication content of the indication information is not limited here, as long as the second device can determine the resource location for receiving the PSSCH based on the indication information. The index of the subchannel including the guard band PRB is not higher than the index of the subchannel carrying the side control information. For the specific explanation of the indication information and the specific implementation of the relevant steps, please refer to S104 and S105.

Exemplarily, still as shown in Figure 13, assuming that subchannel i is subchannel 5, the first device sends PSCCH to the second device on subchannel 6 (shown by a box marked with black). The first device sends PSSCH to the second device on subchannels 5-9 (shown by a box marked with dots). Among them, subchannel 5 includes a guard band PRB (shown by a box marked with a slash). The first device can send indication information to the second device to indicate that the PSSCH occupies subchannel 5. In this way, the second device can determine that the subchannel with the lowest index occupied by the PSSCH is subchannel 5 based on the indication information, and receive and decode the PSSCH accordingly.

As another example, still as shown in FIG. 17 , assuming that subchannel i is subchannel 5, the first device sends PSCCH to the second device on subchannel 6 (shown by a black box). The first device sends PSSCH to the second device on subchannels 5-9, where subchannel 5 does not include a guard band PRB. The first device may send indication information to the second device to indicate that PSSCH occupies subchannel 5. In this way, the second device can determine that the subchannel with the lowest index occupied by PSSCH is subchannel 5 according to the indication information, and receive and decode PSSCH accordingly.

The present application also provides a communication method, as shown in FIG18 , which includes:

S201. A first device determines a first sub-channel set.

The first sub-channel set is a resource used for transmitting sidelink control information and sidelink data information corresponding to the sidelink control information.

In other words, the first subchannel set is a resource for transmitting the PSCCH and the PSSCH corresponding to the PSCCH. The first subchannel set does not include candidate resources overlapping with the guard band PRB. In other words, the PSSCH always does not use the subchannel including the guard band PRB to transmit the sideline control information and the sideline data information corresponding to the sideline control information.

As a possible implementation method (method 1), S201 can be implemented as: S201a1, the first device determines a candidate resource set, and the candidate resource set does not include candidate resources that overlap with the guard band PRB; S201b1, the first device selects a first subchannel set from the candidate resource set.

As another possible implementation method (method 2), S201 can be implemented as: S201a2, the first device determines a candidate resource set; S201b2, the first device selects a first sub-channel set from the candidate resource set, and the first sub-channel set does not include candidate resources that overlap with the guard band PRB.

As another possible implementation (method 3), S201 can be implemented as follows: when configuring the resource pool, the subchannel with the lowest index in each RB set and including the guard band PRB is not numbered. In other words, when numbering the subchannels in the RB set, the subchannel with the lowest index in the RB set and including the guard band PRB is skipped.

Exemplarily, as shown in FIG19 , when numbering the subchannels in RB set1, since the subchannel with the lowest index in RB set1 includes a guard band PRB, the subchannel is not numbered, and starting from the next subchannel of the subchannel, the subchannels in RB set1 are numbered in ascending order of index. In this way, when resource mapping is performed subsequently, resources in unnumbered subchannels will not be mapped, which means that the first device sends PSSCH and PSCCH on a subchannel that does not include a guard band PRB, which can improve information transmission performance. In addition, in this method, by excluding frequency domain resources including guard band PRBs, it can ensure that the subchannel occupied by PSCCH is the subchannel with the lowest index among the subchannels occupied by PSSCH, so that the subchannel of PSCCH that is blindly detected by the receiving end is the subchannel with the lowest index among the subchannels occupied by PSSCH, thereby improving the probability of successful decoding of PSSCH.

As another possible implementation manner (method 4), S201 may be implemented as follows:

When the first subchannel set includes a subchannel with a higher index adjacent to the “subchannel including a guard band PRB”, the first subchannel set also includes the “subchannel including a guard band PRB”. The first frequency domain resource is a frequency domain resource in a subchannel with a higher index adjacent to the “subchannel including a guard band PRB”. In other words, when the subchannel occupied by the PSSCH includes a subchannel with a higher index adjacent to the “subchannel including a guard band PRB”, the PSSCH also occupies the “subchannel including a guard band PRB”. That is, the PSSCH occupies the subchannel with a higher index adjacent to the “subchannel including the guard band PRB” and the “subchannel including the guard band PRB”.

That is, the PSSCH occupies the subchannel including the guard band PRB (always occupied), or the PSCCH subchannel is detected as the subchannel with the second lowest index among the subchannels occupied by the PSSCH, or the adjacent subchannel in the lower frequency domain of the PSCCH subchannel is detected to be occupied by the PSSCH.

Optionally, when the first device satisfies the first condition, when the first subchannel set includes a subchannel with a higher index adjacent to the "subchannel including a protection band PRB", the first subchannel set also includes the "subchannel including a protection band PRB". The first frequency domain resource is a frequency domain resource in a subchannel with a higher index adjacent to the "subchannel including a protection band PRB". In other words, the above method can be performed in combination with the first condition or the second condition in S101. Specifically, when the first device satisfies the first condition, when the subchannel occupied by the PSSCH includes a subchannel with a higher index adjacent to the "subchannel including a protection band PRB", the PSSCH also occupies the "subchannel including a protection band PRB". Here, satisfying the first condition can also be replaced by not satisfying the second condition. Specifically, the description of the first condition and the second condition is detailed in the description of the first condition and the second condition in S101. Since the first device satisfies the first condition, this means that the number of remaining PRBs in the subchannel including the protection band PRB is very small except for the protection band PRB, so the code rate for transmitting the PSCCH will increase. At this time, PSCCH is not transmitted on this subchannel but on the next subchannel with a higher index of the channel. This ensures the number of PRBs for PSCCH and uses the remaining PRBs to transmit data, reducing the code rate of PSSCH and ensuring reliability.

The above method 1 and method 2 are described in detail as follows:

Method 1: S201 includes S201a1 and S201b1

S201a1. The first device determines a candidate resource set.

The candidate resource set belongs to the first channel. The first channel belongs to the first resource pool, which is a sideline resource pool. The first channel can be one or more channels. That is, the first device can access one or more channels by performing LBT. Here, the channel can also be understood as RB set or frequency band or 20M. There is a guard band between two adjacent channels.

The candidate resource set does not include candidate resources that overlap with the guard band PRB, which can be understood as the candidate resource set does not include subchannels that overlap with the guard band PRB, or the candidate resource set does not include the guard band PRB, or the candidate resource set does not include candidate resources that overlap with the guard band PRB, or the candidate resource set does not include candidate resources in the time slot where the guard band PRB is located, or the candidate resource set does not include subchannels that overlap with the guard band PRB, or the candidate resource set does not include candidate resources that overlap with the guard band PRB, or the candidate resource set does not include candidate resources in the time slot that overlaps with the guard band PRB, or does not include candidate resources that overlap with the subchannels including the guard band PRB, or the candidate resource set does not include candidate resources with the guard band PRB, or the candidate resource set does not include candidate resources with the guard band PRB, or the candidate resource set does not include candidate resources with the guard band PRB, or the candidate resource set does not include candidate resources with the guard band PRB, or the candidate resource set does not include candidate resources with the guard band PRB. The above understandings can be interchangeable.

The understanding of the candidate resources overlapping with the guard band PRB in the embodiments of the present application can refer to the above description. For example, the understanding of the candidate resources overlapping with the guard band PRB in "S201a2, the first device determines a candidate resource set" can refer to the above description. Optionally, the candidate resources include a time slot or a subframe or other time domain units in the time domain, which is not limited here.

Optionally, the candidate resources include N subchannels or other frequency domain units in the frequency domain. N is a positive integer and is not limited here. Optionally, N may come from the MAC layer of the first device.

The candidate resource set does not include at least one of the following frequency domain resources: a subchannel including a guard band PRB; a candidate resource including a guard band PRB; a candidate resource in a time slot including a guard band PRB; a subchannel overlapping with a guard band PRB; a candidate resource overlapping with a guard band PRB; a candidate resource in a time slot overlapping with a guard band PRB; a candidate resource overlapping with a subchannel including a guard band PRB. For example, a first channel includes an RB set, and the RB set includes a subchannel including a guard band PRB, which may refer to a subchannel starting from the lowest subchannel in the RB set and including the guard band PRB and the PRB in the RB set.

The understanding of the candidate resources overlapping with the guard band PRB in the embodiments of the present application can refer to the above description. For example, the understanding of the candidate resources overlapping with the guard band PRB in "S201a2, the first device determines a candidate resource set" can refer to the above description.

In other words, the first device may exclude at least one of the following frequency domain resources from the candidate resource set: a subchannel including a guard band PRB; a candidate resource including a guard band PRB; a candidate resource in a time slot including a guard band PRB; a subchannel overlapping with a guard band PRB; a candidate resource overlapping with a guard band PRB; a candidate resource in a time slot overlapping with a guard band PRB; and a candidate resource overlapping with a subchannel including a guard point PRB.

At this time, the candidate resource set does not include candidate resources that overlap with the guard band PRB, so as to avoid the problem that the subchannel including the guard band PRB is used to transmit the PSCCH, thereby the number of PRBs is insufficient and the code rate increases.

As a possible implementation manner, the physical layer of the first device executes S201a and reports the determined candidate resource set to the MAC layer.

Optionally, the first device may execute S201a1 after step 5 of the resource selection process of mode 2, or execute S201a1 after step 6, or execute S201a1 before step 5, or execute S201a1 after determining the initial candidate resource set. The embodiment of the present application does not limit the specific execution time of S201a1.

Optionally, after the candidate resource set is preliminarily determined, if the candidate resource set still includes the guard band PRB or there is a subchannel including the guard band PRB in the candidate resource set, S201a1 may be re-executed to exclude the candidate resource including the guard band PRB.

Exemplarily, as shown in FIG21 , assuming that the subchannel with the lowest index in the first channel is subchannel 5 (including the guard band PRB), the candidate resource set determined by the physical layer does not include subchannel 5, so that the candidate resource selected by the MAC layer from the candidate resource set for carrying PSSCH does not include subchannel 5. For example, the first device determines to transmit PSSCH on subchannels 6-9 except subchannel 5, and transmits PSCCH on subchannel 6, so that the subchannel used to carry PSCCH is the subchannel with the lowest index among the subchannels occupied by PSSCH, which can ensure as much as possible that the subchannel of PSCCH blindly detected by the receiving end is the subchannel with the lowest index among the subchannels occupied by PSSCH, and can improve the probability of successful decoding of PSCCH.

Exemplarily, as shown in FIG20, subchannel 5 overlaps with the guard band PRB, and the candidate resource set determined by the first device does not include subchannel 5. Accordingly, the subchannel selected by the first device in the candidate resource set for carrying PSSCH does not include subchannel 5. In this way, the first device can determine that the subchannels other than subchannel 5 that do not include the guard band PRB are the first subchannel set (for example, there are subchannels 6-9 in the first subchannel set), and send PSSCH on the first subchannel set. Accordingly, the first device sends PSCCH on subchannel 6 with the lowest index among subchannels 6-9. In this method, on the one hand, the subchannel used to carry PSCCH does not include the guard band PRB, which can ensure the number of PRBs used to carry PSCCH. On the other hand, the subchannel used to carry PSCCH is the subchannel with the lowest index among the subchannels occupied by PSSCH. In this way, it can be guaranteed as much as possible that the subchannel of PSCCH blindly detected by the receiving end is the subchannel with the lowest index among the subchannels occupied by PSSCH, which can improve the probability of successful decoding of PSCCH.

S201b1. The first device selects a first sub-channel set from a candidate resource set.

As a possible implementation, the MAC layer of the first device executes S201b1. The first device determines a first subchannel set in the candidate resource set reported by the physical layer. Since the candidate resource set does not include the guard band PRB, the first subchannel set does not include the guard band PRB (and does not overlap with the guard band PRB).

Method 2: S201 includes S201a2 and S201b2

S201a2. The first device determines a candidate resource set.

The physical layer of the first device determines the candidate resource set according to the relevant technology. That is, the candidate resource set is a candidate resource set determined according to the process of "resource selection" in the fourth aspect of the technical term introduction. The candidate resource set includes candidate resources that overlap with the guard band PRB. It can be understood that the impact of the guard band PRB is not considered in the process of determining the candidate resource set.

When the first channel includes the guard band PRB, the candidate resource set includes candidate resources that overlap with the guard band PRB or candidate resources that do not overlap with the guard band PRB. The physical layer of the first device reports the candidate resource set to the MAC layer.

After determining the candidate resource set, the MAC layer selects a candidate resource that does not overlap with the guard band PRB from the candidate resource set for transmitting the PSSCH. For example, as shown in FIG20 , the first device selects to transmit the PSSCH on subchannel 6 that does not include the guard band PRB.

S201b2. The first device selects a first sub-channel set from the candidate resource set.

The first sub-channel set does not include candidate resources that overlap with the guard band PRB.

As a possible implementation, the MAC of the first device selects a candidate resource that does not include a guard band PRB from the candidate resource set. Or the first device preferentially selects a candidate resource that does not include a guard band PRB from the candidate resource set. It can also be understood as selecting a subchannel in the first channel that does not include a guard band PRB for transmitting sidelink data information. For example, still as shown in FIG. 20, The first device succeeds in LBT on RB set 1, and subchannel 5 with the lowest index in RB set 1 includes the guard band PRB. Assume that the candidate resource set determined by the physical layer includes subchannels 5 to 9 of RB set 1. If sidelink data arrives, the MAC layer may exclude subchannel 5 from the candidate resource set, for example, selecting at least one of subchannels 6-9 (shown by a dotted box) to carry the PSSCH.

S202. The first device sends sidelink control information on a first frequency domain resource, where the first frequency domain resource is a resource in a first subchannel set.

Correspondingly, the second device receives the sidelink control information on the first frequency domain resources, where the first frequency domain resources are resources in the first subchannel set.

The first frequency domain resource can be understood as a frequency domain resource used to transmit the sideline control information. The term "used" here does not mean dedicated to sending the sideline control information and the sideline data information associated with the sideline control information, but may also include other information, which is not limited in the present embodiment.

Optionally, the first device sends the sidelink control information and the sidelink data information corresponding to the sidelink control information in a first subchannel set.

The method for determining the sub-channels included in the first sub-channel set carrying the sideline data information may be as follows:

Optionally, the second device does not receive the indication information. For the introduction of the indication information, refer to the introduction of the indication information in S104 and S105. The second device can determine the first subchannel set (or the resources occupied by the PSSCH) based on the detected subchannel of the PSCCH and at least one item in the FRIV field. Among them, the frequency domain length indicated by the FRIV field takes the subchannel where the PSCCH is detected as the frequency domain starting point, and the first subchannel set includes the subchannel of the guard band PRB and the subchannel corresponding to the frequency domain length indicated by the FRIV field. For example, the UE detects PSCCH in subchannel 6, and subchannel 5 includes the guard band PRB. PSSCH occupies subchannel 5 and subchannel 6, and the length indicated by the FRIV field is 1 (1 subchannel), and subchannel 6 is used as the starting point of the subchannel indicated by the FRIV field. Since the UE always uses subchannel 5 corresponding to subchannel 6, the subchannels occupied by PSSCH are subchannel 5 and subchannel 6.

Alternatively, the frequency domain length indicated by the FRIV field takes the subchannel including the guard band PRB as the frequency domain starting point. The first subchannel set includes the subchannel corresponding to the frequency domain length indicated by the FRIV field. The subchannels included in the first subchannel set are the subchannels corresponding to the frequency domain length indicated by the FRIV field. Among them, the subchannel including the guard band PRB is the subchannel with the lowest index among the subchannels occupied by the PSSCH, and the subchannel where the PSCCH is detected is the subchannel with the second lowest index among the subchannels occupied by the PSSCH or a higher frequency domain adjacent subchannel of the subchannel where the PSCCH is detected.

Exemplarily, the subchannel including the guard band PRB is subchannel i, and the subchannel where the PSCCH is detected is subchannel i + 1. The embodiment of the present application does not limit the carrying manner of the indication information.

Optionally, the second device receives indication information. For the introduction of the indication information, reference may be made to the introduction of the indication information in S104 and S105. This method may be implemented in combination with the above method.

Optionally, this method (the method for determining the subchannels included in the first subchannel set carrying the sideline data information) can be implemented in combination with the above method. For example, it can be used in combination with S101 and/or S102, and in combination with S301 and/or S302, and in combination with S401 and/or S402. For example, it can be used in combination with 201.

For example, when used in combination with the method corresponding to FIG. 4A . As shown in FIG. 5 , the first device sends PSCCH to the second device on subchannel 6 and sends PSSCH on subchannels 5-8. The second device detects PSCCH on subchannel 6, and can determine that the subchannel occupied by PSSCH is subchannel 5 including the guard band PRB (PSSCH always occupies the subchannel including the guard band PRB) and the subchannel 6-8 corresponding to the frequency domain length indicated by the FRIV field.

Taking the case where the candidate resource set does not include candidate resources that overlap with the guard band PRB as an example (method 1), illustratively, as shown in FIG20, the first device succeeds in LBT on RB set 1, and subchannel 5 with the lowest index in RB set 1 includes the guard band PRB. Therefore, the first device can exclude subchannel 5 in the process of determining the candidate resource set, and the candidate resource set does not include subchannel 5. The first device can determine resources in other subchannels other than subchannel 5 and send PSSCH on the resource. For example, the first device sends PSSCH on subchannels 6-9 (shown by a box marked with dots). The first device sends PSCCH on subchannel 6 with the lowest index among subchannels 6-9 (shown by a box marked with black).

In this way, the first device can send PSSCH and PSCCH in the subchannel that does not include the guard band PRB, so as to avoid the following situation: the subchannel including the guard band PRB cannot be used for PSCCH and is used for PSSCH. At this time, the receiving end may have inconsistent understanding of whether the transmitting end uses the subchannel, which may lead to decoding failure. On the other hand, the PSSCH and PSCCH are improved. The number of available PRBs can be increased, thereby improving the transmission reliability of PSSCH and PSCCH.

In addition, according to the method of mode 1 or mode 2, since the PSSCH does not occupy the subchannel including the guard band PRB in the RB set, but occupies the subchannel other than the subchannel including the guard band PRB in the RB set. In this way, the position of the PSCCH detected by the receiving end blindly can be the subchannel 3 with the lowest index actually occupied by the PSSCH. Exemplarily, as shown in Figure 20, the first device excludes the subchannel 5 including the guard band PRB in RB set1 when selecting resources. For example, it is determined that the PSSCH occupies the frequency domain resources in the subchannels 6-9 of the RB set1, and the PSCCH occupies the frequency domain resources in the subchannel 6 with the lowest index in the subchannels 6-9. It can be seen that by excluding the frequency domain resources including the guard band PRB, it can be ensured that the subchannel occupied by the PSCCH is the subchannel with the lowest index among the subchannels occupied by the PSSCH, so that the subchannel detected by the receiving end blindly to the PSCCH is the subchannel with the lowest index among the subchannels occupied by the PSSCH, thereby improving the probability of successful decoding of the PSSCH.

In this method (method 1 or method 2), the first device can send PSSCH and PSCCH in a sub-channel that does not include a guard band PRB, avoiding the problems caused by using a sub-channel that includes a guard band PRB, increasing the number of available PRBs for PSSCH and PSCCH, and thereby improving the transmission reliability of PSSCH and PSCCH.

All implementation methods of this application can be combined with the following methods:

In the above, the number of PRBs included in the guard band is less than or equal to the number of PRBs occupied by a subchannel. In another embodiment of the present application, the number of PRBs included in the guard band may be greater than the number of PRBs occupied by a subchannel. In this case, the first device and the second device can still adopt the communication method of the embodiment of the present application to improve information transmission performance.

Taking the case where the PRB included in the guard band spans two subchannels as an example, in this method, subchannel i may be the subchannel with the second lowest index in the first subchannel set, and subchannel i-1 is the subchannel with the lowest index in the first subchannel set. i is an integer greater than or equal to 1.

In an embodiment of the present application, the first device may determine whether PRBs other than the guard band PRBs in the subchannel i are sufficient, and accordingly determine the first frequency domain resource for carrying the PSCCH.

Exemplarily, as shown in FIG22, the first device accesses RB set1, and subchannel 5 (an example of subchannel i-1) and subchannel 6 (an example of subchannel i) in RB set1 both include guard band PRBs. The first device can determine whether PRBs other than the guard band PRBs in subchannel 6 are sufficient. If sufficient, PSCCH is sent on the first frequency domain resource of subchannel 6. If insufficient, as shown in FIG22, the first device can switch to sending PSCCH on subchannel 7. Alternatively, PRBs other than the guard band PRBs in subchannel 6 are insufficient, and PSCCH is sent on subchannel 6 and subchannel 7.

In the embodiment of the present application, the first device starts mapping the PSCCH from the PRB with the lowest index except the guard band PRB in the first sub-channel set.

Exemplarily, as shown in Figure 22, assuming that the first subchannel set includes subchannels 5-8, the first device starts mapping PSCCH from the PRB with the lowest index (PRB in subchannel 6 (an example of subchannel i)) in subchannels 5-8 except the guard band PRB.

In an embodiment of the present application, the first device sends a PSCCH on a first subchannel. The first subchannel is a subchannel with the smallest index in the first subchannel set excluding the subchannel including the guard band PRB. Exemplarily, as shown in FIG22, the first subchannel is subchannel 7. In this implementation, optionally, the first device may send indication information, the indication information being used to indicate whether the side data information occupies the subchannel including the guard band PRB in the first subchannel set.

In an embodiment of the present application, the first device sends a PSCCH on subchannel i+1. Subchannel i may be the subchannel with the second lowest index in the first subchannel set, and subchannel i-1 is the subchannel with the lowest index in the first subchannel set. i is an integer greater than or equal to 1. Exemplarily, as shown in FIG22, subchannel i is subchannel 6, and subchannel i+1 is subchannel 7. In this implementation, optionally, the first device may send indication information, the indication information being used to indicate whether the side data information occupies a subchannel including a guard band PRB in the first subchannel set.

In an embodiment of the present application, the first device sends a PSCCH on subchannel i+1 and subchannel i. Subchannel i may be a subchannel with the second lowest index in the first subchannel set, and subchannel i-1 is a subchannel with the lowest index in the first subchannel set. i is an integer greater than or equal to 1.

The above is mainly explained by taking the application in SL scenario as an example. The technical solution of the embodiment of the present application can also be applied in UL scenario. The embodiment of the present application does not limit the application scenario. In the UL scenario, the corresponding features of the SL scenario can be replaced with the corresponding features of the UL scenario. For example, the first frequency domain resource in the SL can be replaced with the first frequency domain unit set, which is the frequency domain unit occupied by the data information associated with the control information. In the embodiment of the present invention, the first frequency domain unit set is the first subchannel set, and the control information is the side control information. However, the embodiment of the present invention is not limited to this case.

Optionally, any method of each embodiment of this embodiment can be used in combination or independently. Without limitation, methods formed by various combinations are all within the protection scope of the embodiments of the present application.

In various embodiments of the present application, preconfiguration or (pre) configuration may refer to one or more of predefinition, network device configuration, and network device indication.

The illustration of PSSCH and PSCCH resources takes the absence of PSFCH as an example. In the embodiment of the present application, the time slot where PSSCH and PSCCH are located may also include PSFCH.

Optionally, the embodiments of the present application do not limit the carrying method of messages and signaling.

It should be noted that the above-mentioned multiple embodiments can be combined and the combined scheme can be implemented. Optionally, some operations in the process of each method embodiment are optionally combined, and/or the order of some operations is optionally changed. In addition, the execution order between the steps of each process is only exemplary and does not constitute a limitation on the execution order between the steps. There can also be other execution orders between the steps. It is not intended to indicate that the execution order is the only order in which these operations can be performed. Ordinary technicians in this field will think of many ways to reorder the operations of this article. In addition, it should be pointed out that the process details involved in a certain embodiment of this article are also applicable to other embodiments in a similar manner, or different embodiments can be used in combination.

In addition, some steps in the method embodiment may be equivalently replaced by other possible steps. Alternatively, some steps in the method embodiment may be optional and may be deleted in certain usage scenarios. Alternatively, other possible steps may be added to the method embodiment.

Furthermore, the above method embodiments may be implemented separately or in combination.

It is understandable that the device in the embodiment of the present application includes a hardware structure and/or software module corresponding to each function in order to realize the above functions. In combination with the units and algorithm steps of each example described in the embodiment disclosed in the present application, the embodiment of 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. Those skilled in the art 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 technical solution of the embodiment of the present application.

The embodiment of the present application can divide the functional units of the communication device according to the above method example. For example, each functional unit can be divided according to each function, or two or more functions can be integrated into one processing unit. The above integrated unit can be implemented in the form of hardware or in the form of software functional units. It should be noted that the division of units 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.

The present application also provides a device in an embodiment of the present application, which may be the above-mentioned first device, second device, third device, or corresponding component. The device may include: a memory and one or more processors. The memory is coupled to the processor. The memory is used to store computer program code, and the computer program code includes computer instructions. When the processor executes the computer instructions, the device may perform the various functions or steps performed by the first device, the second device, or the third device in the above-mentioned method embodiment. The structure of the device can refer to the structure of the device shown in Figure 3.

Among them, the core structure of the device can be represented as the structure shown in Figure 23, and the device includes: a processing module 1301 and a storage module 1303.

The processing module 1301 may include at least one of a central processing unit (CPU), an application processor (AP) or a communication processor (CP). The processing module 1301 may perform operations or data processing related to the control and/or communication of at least one of the other elements of the user communication device.

The storage module 1303 may include a volatile memory and/or a non-volatile memory. The storage module is used to store at least one instruction or data related to other modules of the device.

Optionally, a communication module 1305 is also included to support the device to communicate with other devices (through a communication network). For example, the communication module can be connected to a network via wireless communication or wired communication to communicate with other devices. Wireless communication can use at least one of cellular communication protocols, such as long term evolution (LTE), advanced long term evolution (LTE-A), code division multiple access (CDMA), wideband code division multiple access (WCDMA), universal mobile telecommunications system (UMTS), wireless broadband (WiBro) or global mobile communication system (GSM). Wireless communication may include, for example, short-range communication. Short-range communication may include at least one of wireless fidelity (Wi-Fi), Bluetooth, near field communication (NFC), magnetic stripe transmission (MST) or GNSS.

The present application also provides a chip system, as shown in FIG24, which includes at least one processor 1401 and at least one interface circuit 1402. The processor 1401 and the interface circuit 1402 can be interconnected via a line. It can be used to receive signals from other devices (such as the memory of the communication device). For another example, the interface circuit 1402 can be used to send signals to other devices (such as the processor 1401). Exemplarily, the interface circuit 1402 can read the instructions stored in the memory and send the instructions to the processor 1401. When the instructions are executed by the processor 1401, the communication device can perform the various steps in the above embodiments. Of course, the chip system can also include other discrete devices, which is not specifically limited in the embodiments of the present application.

An embodiment of the present application also provides a computer storage medium, which includes computer instructions. When the computer instructions are executed on the above-mentioned communication device, the communication device executes each function or step executed by the mobile phone in the above-mentioned method embodiment.

The embodiment of the present application also provides a computer program product. When the computer program product is run on a computer, the computer executes each function or step executed by the mobile phone in the above method embodiment.

Through the description of the above implementation methods, technical personnel in the relevant field can clearly understand that for the convenience and simplicity of description, only the division of the above-mentioned functional modules is used as an example. In actual applications, the above-mentioned functions can be assigned to different functional modules as needed, that is, the internal structure of the device can be divided into different functional modules to complete all or part of the functions described above.

In the several embodiments provided in the present application, it should be understood that the disclosed devices and methods can be implemented in other ways. For example, the device embodiments described above are only schematic. For example, the division of modules or units is only a logical function division. There may be other division methods in actual implementation. For example, multiple units or components can be combined or integrated into another device, or some features can be ignored or not executed. Another point is that the mutual coupling or direct coupling or communication connection shown or discussed can be through some interfaces, indirect coupling or communication connection of devices or units, which can be electrical, mechanical or other forms.

The units described as separate components may or may not be physically separated, and the components shown as units may be one physical unit or multiple physical units, that is, they may be located in one place or distributed in multiple different places. Some or all of the units may be selected according to actual needs to achieve the purpose of the present embodiment.

In addition, each functional unit in each embodiment of the present application may be integrated into one processing unit, or each unit may exist physically separately, or two or more units may be integrated into one unit. The above-mentioned integrated unit may be implemented in the form of hardware or in the form of software functional units.

If the integrated unit is implemented in the form of a software functional unit and sold or used as an independent product, it can be stored in a readable storage medium. Based on this understanding, the technical solution of the embodiment of the present application is essentially or the part that contributes to the prior art or all or part of the technical solution can be embodied in the form of a software product, which is stored in a storage medium and includes several instructions to enable a device (which can be a single-chip microcomputer, chip, etc.) or a processor (processor) to execute all or part of the steps of the various embodiments of the present application. The aforementioned storage medium includes: U disk, mobile hard disk, read-only memory (ROM), random access memory (RAM), disk or optical disk and other media that can store program code.

The above contents are only specific implementation methods of the present application, but the protection scope of the present application is not limited thereto. Any changes or substitutions within the technical scope disclosed in the present application shall be included in the protection scope of the present application. Therefore, the protection scope of the present application shall be subject to the protection scope of the claims.

Claims

A communication method, characterized in that the method comprises:

Determine the candidate resource set;

Determine a first subchannel set from the candidate resource set, the first subchannel set does not include candidate resources overlapping with a guard band physical resource block PRB, wherein the first subchannel set is a resource used to transmit sideline control information and sideline data information corresponding to the sideline control information;

The sidelink control information is sent on a first frequency domain resource, where the first frequency domain resource is a resource in the first subchannel set.
The method according to claim 1, characterized in that

The candidate resources in the candidate resource set include N subchannels in the frequency domain, where N is a positive integer.
The method according to claim 1 or 2, characterized in that

Determining a first subchannel set from the candidate resource set, where the first subchannel set does not include candidate resources overlapping with a guard band PRB, includes:

A first candidate resource is excluded from the candidate resource set, wherein the first subchannel set does not include the first candidate resource, wherein a subchannel with a lowest index of the first candidate resource overlaps with a guard band PRB.
A communication device, comprising:

A processing unit, configured to determine a set of candidate resources;

The processing unit is further configured to determine a first subchannel set from the candidate resource set, wherein the first subchannel set does not include candidate resources overlapping with a guard band physical resource block PRB, wherein the first subchannel set is a resource used to transmit sidelink control information and sidelink data information corresponding to the sidelink control information;

The transceiver unit is used to send the side control information on a first frequency domain resource, where the first frequency domain resource is a resource in the first subchannel set.
The device according to claim 4, characterized in that

The candidate resources in the candidate resource set include N subchannels in the frequency domain, where N is a positive integer.
The device according to claim 5, characterized in that

The processing unit is used to determine a first sub-channel set from the candidate resource set, where the first sub-channel set does not include candidate resources overlapping with a guard band PRB, including:

A first candidate resource is excluded from the candidate resource set, wherein the first subchannel set does not include the first candidate resource, wherein a subchannel with a lowest index of the first candidate resource overlaps with a guard band PRB.
A communication method, characterized in that the method comprises:

The first device determines a first frequency domain resource;

The first device sends side control information on the first frequency domain resource;

Among them, if the number of resource blocks other than the guard band physical resource block PRB in subchannel i is less than the first threshold, or the proportion of resource blocks other than the guard band PRB in subchannel i in all resource blocks included in subchannel i is less than the second threshold, or the code rate of the side control information corresponding to the resources other than the guard band PRB in subchannel i is greater than the third threshold, then the first frequency domain resources are the frequency domain resources in subchannel i+1, or the first frequency domain resources include part of the frequency domain resources in subchannel i and part or all of the frequency domain resources in subchannel i+1;

Alternatively, if the number of resource blocks other than the guard band PRB in the subchannel i is greater than or equal to the first threshold, or the proportion of resource blocks other than the guard band PRB on the subchannel i in all resource blocks included in the subchannel i is greater than or equal to the second threshold, or the code rate of the side control information corresponding to the resources other than the guard band PRB on the subchannel i is less than or equal to the third threshold, then the first frequency domain resource is the frequency domain resource on the subchannel i;

The subchannel i and the subchannel i+1 are subchannels in a first subchannel set, and the first subchannel set is a subchannel occupied by the sideline data information associated with the sideline control information; the i is an integer greater than or equal to 0.
The method according to claim 7, characterized in that the method further comprises:

The first device performs a listen-before-talk (LBT) process to obtain a first channel occupancy time (COT), and the frequency domain resources corresponding to the first COT include the first frequency domain resources.
The method according to claim 7 or 8 is characterized in that the subchannel i is the subchannel with the lowest index in the first subchannel set.
The method according to any one of claims 7 to 9, characterized in that the first frequency domain resource is a frequency domain resource in the subchannel i;

The starting position of the first frequency domain resource is the PRB with the smallest index excluding the guard band PRB in the subchannel i;

The end position of the first frequency domain resource is determined according to the start position of the first frequency domain resource and the resource quantity of the sidelink control information, or the end position of the first frequency domain resource is the PRB with the largest index in the subchannel i.
The method according to any one of claims 7 to 9, characterized in that the first frequency domain resource is a frequency domain resource in the subchannel i;

The starting position of the first frequency domain resource is the PRB with the smallest index excluding the guard band PRB in the subchannel i;

The end position of the first frequency domain resource is the PRB with a smaller index in the first PRB and the second PRB, the first PRB is the PRB with the largest index in the subchannel i, and the second PRB is a PRB determined based on the starting position of the first frequency domain resource and the number of resources of the side control information.
The method according to any one of claims 7 to 9, characterized in that the first frequency domain resources include part of the frequency domain resources in the subchannel i and part or all of the frequency domain resources in the subchannel i+1;

The starting position of the first frequency domain resource is the PRB with the smallest index excluding the guard band PRB in the subchannel i;

The end position of the first frequency domain resource is determined according to the start position of the first frequency domain resource and the resource quantity of the sidelink control information, or the end position of the first frequency domain resource is the PRB with the largest index in the subchannel i+1.
The method according to any one of claims 7-9 is characterized in that the first frequency domain resource is the frequency domain resource in the sub-channel i+1, and the starting position of the first frequency domain resource is the PRB with the smallest index in the sub-channel i+1.
The method according to any one of claims 7 to 13, characterized in that the method further comprises:

Send indication information, where the indication information is used to indicate whether the sidelink data information occupies a subchannel including a guard band PRB.
The method according to claim 14, characterized in that

The index of the subchannel including the guard band PRB is not higher than the index of the subchannel carrying the sidelink control information.
A communication method, characterized in that the method comprises:

The first device determines a first frequency domain resource; the starting position of the first frequency domain resource is a PRB with the lowest index except a guard band physical resource block PRB in a first subchannel set; the first subchannel set is a subchannel occupied by sidelink data information associated with sidelink control information;

The first device sends the sidelink control information on the first frequency domain resources.
The method according to claim 16, characterized in that

The number of PRBs included in the first frequency domain resources is X, where X is the number of resources for the sidelink control information, and X is configured, preconfigured, or predefined by a network device, and X is a positive integer.
The method according to claim 16 or 17 is characterized in that the X PRBs are frequency domain resources in subchannel i, or the X PRBs include part of the frequency domain resources in subchannel i and part or all of the frequency domain resources in subchannel i+1, the subchannel i and the subchannel i+1 are subchannels in the first subchannel set, and the subchannel i is the subchannel with the lowest index in the first subchannel set.
The method according to any one of claims 16 to 18, characterized in that the method further comprises:

Perform a channel access process in unlicensed spectrum resources to acquire a first channel;

The first set of subchannels is determined in the first channel.
A communication device, characterized in that the communication device includes a memory and one or more processors; the memory and the processor are coupled; the memory is used to store computer program code, and the computer program code includes computer instructions. When the processor executes the computer instructions, the one or more processors execute the method as described in any one of claims 1-3, or execute the method as described in any one of claims 7-19.
A computer-readable storage medium having instructions stored therein, characterized in that when the instructions are executed on a device, the device executes a method as described in any one of claims 1 to 3, or executes a method as described in any one of claims 7 to 19.
A communication device, comprising:

A processor, configured to execute a computer program stored in a memory so that the device performs a method as described in any one of claims 1 to 3, or performs a method as described in any one of claims 7 to 19.
The device according to claim 18, characterized in that the device further comprises the memory and/or the communication interface, wherein the communication interface is coupled to the processor,

The communication interface is used to input and/or output information.
A computer program product, characterized in that the computer program product comprises instructions for executing the method according to any one of claims 1 to 3, or executing the method according to any one of claims 7 to 19.