WO2024067429A1

WO2024067429A1 - Communication method and communication apparatus

Info

Publication number: WO2024067429A1
Application number: PCT/CN2023/120901
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: 2022-09-30
Filing date: 2023-09-23
Publication date: 2024-04-04
Also published as: CN117858236A

Abstract

Provided in the embodiments of the present application are a communication method and a communication apparatus, which can be applied to scenes of V2X, the Internet of Vehicles, assisted driving, autonomous driving, unlicensed spectrum, business scenes, XR, etc. The communication method comprises: determining at least one slot and a first resource, wherein the at least one slot is used for transmitting data, and the first resource is used for transmitting feedback information of data transmitted in the at least one slot; sending first data on a first slot, wherein the first slot is included in the at least one slot; and receiving feedback information of the first data on a second resource, wherein the second resource is included in the first resource. In this way, it can be ensured that a sending end of data receives feedback information of the data.

Description

Communication method and communication device

This application claims the priority of the Chinese patent application filed with the China Patent Office on September 30, 2022, with application number 202211215652.8 and application name “Communication Method and Communication Device”, all contents of which are incorporated by reference in this application.

Technical Field

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

Background technique

The channels supported in the vehicle communication technology based on the next generation communication (new radio-vehicle, NR-V) may include a physical sidelink control channel (physical sidelink control channel, PSCCH), a physical sidelink shared channel (physical sidelink shared channel, PSSCH), and a physical sidelink feedback channel (physical sidelink feedback channel, PSFCH). Among them, the PSCCH may include sidelink control information (Sidelink Control Information, SCI), and the SCI includes fields required for decoding data. The PSSCH is used to carry the second-level SCI and data, or the PSSCH may also carry the media access control control element (media access control control element, MAC CE). The PSFCH is used to carry hybrid automatic repeat request (hybrid auto repeat request, HARQ) information, and the HARQ information includes an acknowledgment (ACK) or a negative acknowledgment (NACK).

When the transmitting end schedules data, the SCI may carry a HARQ enable/disable field to indicate whether the data scheduled by the SCI supports HARQ feedback. If the data scheduled by the SCI supports HARQ feedback, the receiving end will feedback the corresponding HARQ on the PSFCH resource after receiving the data; if the data scheduled by the SCI does not support HARQ feedback, the receiving end will not feedback HARQ after receiving the data.

However, in the above manner, the transmitting end and the receiving end cannot determine the resources used for the feedback HARQ, which may result in the transmitting end being unable to receive the HARQ.

Summary of the invention

The embodiments of the present application provide a communication method and a communication device, which can ensure that a data transmitter receives feedback information of the data.

In a first aspect, an embodiment of the present application provides a communication method, the method comprising:

Determine at least one time slot and a first resource, the at least one time slot is used to transmit data, and the first resource is used to transmit feedback information of the data transmitted in the at least one time slot; send first data on the first time slot, and the first time slot is included in the at least one time slot; receive feedback information of the first data on a second resource, and the second resource is included in the first resource.

In an embodiment of the present application, there is a corresponding relationship between the at least one time slot and the first resource, and the data transmitted in the at least one time slot needs to be fed back on the first resource. Exemplarily, the corresponding relationship between the at least one time slot and the first resource can be understood as that the time slot where the first resource is located is the first time slot including the PSFCH resource after an interval of K time slots from one of the at least one time slots. The data received in one of the at least one time slots is fed back to HARQ in the first time slot including the PSFCH resource after an interval of K time slots (i.e., the time slot where the first resource is located). The time interval K is the minimum time interval. The time interval K is a positive integer. Optionally, K can be 2 or 3. The second resource corresponding to the first data can be determined from the first resource based on the corresponding relationship between the at least one time slot and the first resource, so that the terminal device sending the first data can receive feedback information of the first data on the second resource.

In a second aspect, an embodiment of the present application provides a communication method, the method comprising:

Determine at least one time slot and a first resource, the at least one time slot is used to transmit data, and the first resource is used to transmit feedback information of the data transmitted in the at least one time slot; receive first data on the first time slot, and the first time slot is included in the at least one time slot; send feedback information of the first data on a second resource, and the second resource is included in the first resource.

In an embodiment of the present application, there is a corresponding relationship between the at least one time slot and the first resource, and the data transmitted in the at least one time slot needs to be fed back on the first resource. Exemplarily, the corresponding relationship between the at least one time slot and the first resource can be understood as that the time slot where the first resource is located is the first time slot including the PSFCH resource after an interval of K time slots from one of the at least one time slots. The data received in one of the at least one time slots is fed back to HARQ in the first time slot including the PSFCH resource after an interval of N time slots (i.e., the time slot where the first resource is located). The time interval K is a positive integer. Optionally, K can be 2 or 3. The second resource corresponding to the first data can be determined from the first resource based on the corresponding relationship between the at least one time slot and the first resource, so that the terminal device sending the first data can receive feedback information of the first data on the second resource.

In combination with the first aspect and the second aspect, in a possible implementation manner, the second resource is determined according to the first resource, the number of the at least one time slot, and the number of terminal devices, and the number of terminal devices is the number of terminal devices corresponding to the at least one time slot or the number of The number of terminal devices corresponding to the first time slot.

In the embodiment of the present application, the number of terminal devices corresponding to at least one time slot is the number of terminal devices that send data on the at least one time slot, and the terminal devices corresponding to the first time slot are the number of terminal devices that send data on the first time slot. The first resource can be allocated according to the number of at least one time slot and the number of terminal devices, and the first resource is allocated to each terminal device that sends data on at least one time slot, and the second resource is the resource corresponding to the terminal device that sends the first data. The first resource is allocated according to the number of terminal devices and the number of at least one time slot, so that the first resource can be fully utilized to avoid waste of resources.

In combination with the first aspect and the second aspect, in a possible implementation method, the number of terminal devices is the number of terminal devices corresponding to the first time slot, and the method also includes: determining a third resource corresponding to the first time slot from the first resource based on the number of the at least one time slot; determining the second resource from the third resource based on the number of terminal devices.

In an embodiment of the present application, the first resource can be first allocated to each time slot in at least one time slot according to the number of at least one time slot, and then the resources corresponding to the time slot can be allocated to each terminal device according to the number of terminal devices corresponding to the time slot, so that the third resource can be reasonably allocated, so that the third resource can be fully utilized and waste of resources can be avoided.

In combination with the first aspect and the second aspect, in a possible implementation manner, the first resource includes frequency domain resources, the third resource includes frequency domain resources, and the second resource includes frequency domain resources or frequency domain code domain resources.

In the embodiment of the present application, when the first resource is allocated to each time slot, the frequency domain resource included in the first resource can be allocated, the frequency domain resource of the third resource is included in the frequency domain resource of the first resource, and the code domain resource of the third resource is the same as the code domain resource of the first resource. Allocating resources according to the frequency domain resource of the first resource can simplify the allocation process and determine the second resource more quickly.

In combination with the first aspect and the second aspect, in a possible implementation manner, the first resource includes frequency domain and code domain resources, the third resource includes frequency domain and code domain resources, and the second resource includes frequency domain and code domain resources.

In the embodiment of the present application, the first resource and the third resource include frequency domain code domain resources, so that the first resource and the third resource include more allocable resources. When the number of frequency domain resources of the first resource is insufficient or the number of frequency domain resources of the third resource is insufficient, allocation is performed according to the frequency domain code domain resources of the first resource or allocation is performed according to the frequency domain code domain resources of the third resource, so that resources can be allocated more reasonably.

In combination with the first aspect and the second aspect, in a possible implementation, the frequency domain code domain resources are sorted in ascending order by first index in the frequency domain, and then by index in the code domain; or, the sorting method is first sorted in ascending order by index in the code domain, and then by index in the frequency domain. Exemplarily, when the code domain resources include cyclic shift CS logarithms and frequency domain orthogonal cover codes OCC, they can be sorted in ascending order by index in the frequency domain, then by index of cyclic shift pairs, and then by index of OCC. Or they can be sorted in ascending order by index in the frequency domain, then by index of OCC, and then by index of cyclic shift pairs.

In an embodiment of the present application, frequency domain and code domain resources can be sorted to facilitate allocation of the frequency domain and code domain resources to each terminal device.

In combination with the first aspect and the second aspect, in a possible implementation, the number of terminal devices is the number of terminal devices corresponding to the at least one time slot, the position of the second resource in the first resource is determined by the index of the first terminal device sending the first data in the at least one terminal device corresponding to the at least one time slot, and the index of the first terminal device in the at least one terminal device satisfies: k=N1+y, wherein k is the index of the first terminal device in the at least one terminal device, N1 is the number of terminal devices corresponding to the time slot whose index in the at least one time slot is less than the index of the first time slot, and y is the index of the frequency domain resource occupied by the first terminal device in the first time slot (the relative frequency domain position in each terminal device in the first time slot); or, the index of the first terminal device in the at least one terminal device satisfies: k=N2+x, wherein k is the index of the first terminal device in the at least one terminal device, N2 is the number of terminal devices whose index of the frequency domain resource occupied in the at least one time slot is less than the index of the frequency domain resource occupied by the first terminal device in the first time slot, and x is the index of the first time slot in the at least one time slot.

In an embodiment of the present application, the index of the first terminal device in at least one terminal device can be understood as the number corresponding to the relative position of the first terminal device in at least one terminal device. Exemplarily, the index of the first terminal device can represent the order of its allocated feedback resources (first resources). For example, the indexes of the four terminal devices are 0, 1, 2, and 3, respectively, representing the order in which the feedback resources are allocated. The at least one terminal device can be sorted in ascending order by the index of the frequency domain resources occupied in the time slot, and then in ascending order by the index of the time slot. Or the at least one terminal device can be sorted in ascending order by the index of the time slot, and then in ascending order by the index of the frequency domain resources occupied in the time slot. According to the different arrangement methods of the at least one terminal device, the index of the first terminal device in at least one terminal device is different, and the position of the second resource corresponding to the first terminal device on the first resource is different.

In combination with the first aspect and the second aspect, in a possible implementation method, at least one of the at least one time slot, the number of terminal devices, and the first resource is indicated by first indication information, and the first indication information is used to indicate the starting position and length of the occupied channel resources, and the number of terminal devices sharing the channel resources.

In the embodiment of the present application, the first indication information may be generated by an initial terminal device, which is a terminal device that successfully accesses the channel. After the initial terminal device successfully accesses the channel, the starting position and length of the channel resource can be indicated through the first indication information to share the channel resource with the shared terminal device, so as to enable the initial terminal device and the shared terminal device to communicate based on the unlicensed spectrum. The first indication information indicates at least one time slot, the number of terminal devices, and any one of the first resources, so that the shared terminal device can determine the second resource for transmitting the feedback information of the first data based on the first indication information.

In combination with the first aspect and the second aspect, in a possible implementation manner, the number of terminal devices is the maximum number of terminal devices supported by the first time slot, or the maximum number of terminal devices supported by the at least one time slot.

In an embodiment of the present application, when the number of terminal devices corresponding to at least one time slot or the number of terminal devices corresponding to the first time slot cannot be determined, the first resource can be allocated based on the maximum number of terminal devices supported by at least one time slot or the maximum number of terminal devices supported by the first time slot, so that the first resource can be reasonably allocated.

In combination with the first aspect and the second aspect, in a possible implementation, the number of the at least one time slot is determined by the period of a physical side link feedback channel PSFCH resource, and the PSFCH resource is a periodically configured resource for transmitting feedback information.

In combination with the first aspect and the second aspect, in a possible implementation manner, the second resource is determined according to the first resource and the quantity of the at least one time slot.

In an embodiment of the present application, the first resource can be allocated according to the number of at least one time slot, so that the first resource can be reasonably allocated to avoid waste of resources.

In combination with the first aspect and the second aspect, in a possible implementation, the number of frequency domain resources contained in the second resource satisfies: N=M/S, wherein N is the number of frequency domain resources contained in the second resource, M is the number of frequency domain resources contained in the first resource, and S is the number of the at least one time slot. Optionally, assuming that M cannot divide S, the margin is allocated according to the index of the time slot (the order of the time slots in the time domain). Exemplarily, 2 time slots are divided into 5 resources, then the first time slot is divided into 3 resources, and the second time slot is divided into 2 resources.

In an embodiment of the present application, the first resource can be evenly distributed to each time slot in at least one time slot, so that each time slot can be allocated with more feedback resources, thereby achieving reasonable allocation of feedback resources and avoiding waste of feedback resources in unlicensed spectrum.

In combination with the first aspect and the second aspect, in a possible implementation manner, the position of the second resource on the first resource is determined by an index of the first time slot in the at least one time slot.

In the embodiment of the present application, the index of the first time slot in the at least one time slot is the order of the first time slot in the at least one time slot. Exemplarily, the order of the first time slot in the at least one time slot is the first time slot, and the index is 0. The specific position of the second resource on the first resource can be more accurately determined according to the index of the first time slot in the at least one time slot.

In combination with the first aspect and the second aspect, in a possible implementation method, the index of the frequency domain resources included in the second resource on the first resource satisfies: i*N<j<(i+1)*N-1, wherein j is the index corresponding to the frequency domain resources included in the second resource in the first resource, i is the index corresponding to the first time slot in the at least one time slot, and N is the number of frequency domain resources included in the second resource.

In conjunction with the second aspect, in a possible implementation manner, the first data is multicast data, and the sending feedback information of the first data on the second resource includes:

In the case where the first data is successfully decoded, first information is sent on a fourth resource, the first information is used to occupy a channel, and the fourth resource is included in the resources corresponding to the feedback opportunity, and the resources corresponding to the feedback opportunity include the first resource; in the case where the first data is not successfully decoded, negative acknowledgment NACK information is sent on a fifth resource, the fifth resource is a resource in the second resource, and the fifth resource is frequency division multiplexed or code division multiplexed with the fourth resource.

Alternatively, the first data is multicast data, and sending feedback information of the first data on the second resource includes:

In case the first data is decoded successfully, the first information is sent on a fourth resource, the fourth resource is included in the resources corresponding to the feedback opportunity, and the resources corresponding to the feedback opportunity include the first resource; in case the first data is not decoded successfully, a negative acknowledgement NACK information is sent on a fifth resource, the fifth resource is a resource in the second resource, and the fifth resource is frequency division multiplexed or code division multiplexed with the fourth resource.

In an embodiment of the present application, the feedback opportunity may be a PSFCH transmission opportunity, and the resource corresponding to the feedback opportunity is the PSFCH resource included in the time slot including the PSFCH resource. Or the feedback opportunity may be a PSFCH symbol, and the resource corresponding to the feedback opportunity is all PRBs or PRB sets included in the PSFCH symbol. The first information may be a positive acknowledgment ACK information or NACK information, or any other information, which is not limited here. The first information may be ACK information or NACK information, which may be configured or pre-configured by a network device. The first data is multicast data, and the terminal device decodes the first data after receiving the first data. In the case of successful decoding, the first information is sent on the fourth resource, so that the channel can be occupied, thereby avoiding the interruption of the channel occupancy time due to the fact that the PSFCH resource is not used in the multicast data transmission due to the successful decoding of the first data by the terminal devices, thereby ensuring the continuity of the channel occupancy time.

The first information is used to define the function and physical meaning of the first information for occupying the channel. It can be understood that the first information occupying the channel is not a necessary feature of the embodiment of the present application. The first information is also used to meet the occupied channel bandwidth (OCB) requirement.

In combination with the second aspect, in a possible implementation method, the fourth resource is a public resource, and the fourth resource is used to transmit the first information sent by a terminal device that successfully decodes the first data, or the fourth resource is used to transmit the first information sent by a terminal device that detects side control information SCI that schedules the first data.

In combination with the second aspect, in a possible implementation manner, the fifth resource is a public resource, and the fifth resource is used to transmit the first information sent by a terminal device that successfully decodes the first data.

In an embodiment of the present application, the first data is multicast data and may correspond to multiple receiving terminal devices. The fourth resource is a public resource, and the terminal device that successfully decodes the first data may send the first information on the fourth resource. Alternatively, the terminal device that detects the SCI that schedules the first data may send the first information on the fourth resource. The first information may be transmitted in a public resource to avoid overlapping of resources for transmitting the first information with resources for transmitting NACK information, so as to facilitate resource management, and utilize public resources to meet occupied channel bandwidth (OCB) requirements or occupy channels, so as to save feedback resources as much as possible.

In combination with the second aspect, in a possible implementation manner, the fourth resource is included in the second resource, and the position of the fourth resource on the second resource is determined by the source identifier and the offset.

In the embodiment of the present application, the fourth resource may be included in the second resource, and the second resource is a resource allocated to the terminal device sending the first data on the first resource. The position of the fourth resource on the second resource is determined by the source identifier and the offset, and the position of the fifth resource on the second resource is determined by the source identifier, so that the fourth resource can avoid conflict with the fifth resource.

In conjunction with the second aspect, in a possible implementation manner, the index of the fourth resource on the second resource satisfies: index2=(ID+offset)mod M, wherein the index2 is the index of the fourth resource, the ID is the source identifier, the offset is the offset, and M is the number of resources included in the second resource. The offset may be preconfigured, or preset, or configured by a network device.

In combination with the second aspect, in a possible implementation manner, the position of the fourth resource in the resources corresponding to the feedback opportunity is preconfigured or configured by the network device.

In an embodiment of the present application, the position of the fourth resource in the resources corresponding to the feedback opportunity may be pre-configured or configured by the network device, so that the terminal device can quickly determine the position of the fourth resource in the resources corresponding to the feedback opportunity based on the configuration.

In combination with the second aspect, in a possible implementation manner, the fourth resource is indicated by a bitmap.

In the embodiment of the present application, the bitmap may also be referred to as a bit string, and the length of the bitmap may be less than or equal to the number of all PRBs included in the PSFCH symbol. In this case, among all PRBs included in the PSFCH symbol, the remaining resources after excluding the fourth resource are the resources that can transmit the real HARQ information.

In combination with the second aspect, in a possible implementation manner, sending the first information on the fourth resource includes:

The first information is sent on the fourth resource when the first condition is met; the first condition includes: the data transmitted in the at least one time slot does not include multicast data and/or unicast data with feedback in the form of ACK information or NACK information, and the second-level SCI corresponding to the first data indicates that hybrid automatic repeat request HARQ is enabled.

In the embodiment of the present application, when the first condition is met, the feedback resource (i.e., the first resource) in the unlicensed spectrum is not used. In order to avoid interruption of the channel occupation time, the first information needs to be sent to meet the OCB requirement and ensure the continuity of the channel occupation time. When the above first condition is not met, the feedback resource in the unlicensed spectrum can be used, and the first information may not be sent, saving signaling overhead.

In a third aspect, an embodiment of the present application provides a communication method, the method comprising:

Receive first data, where the first data is multicast data; if the first data is successfully decoded, send first information on a fourth resource, where the first information is used to occupy a channel, and the fourth resource is included in the resources corresponding to the feedback opportunity; if the first data is not successfully decoded, send negative acknowledgment NACK information on a fifth resource, where the fifth resource is a resource in the second resource, the fifth resource is frequency-division multiplexed or code-division multiplexed with the fourth resource, and the second resource is included in the resources corresponding to the feedback opportunity.

Alternatively, the method comprises:

Receive first data, where the first data is multicast data; if the first data is successfully decoded, send first information on a fourth resource, where the fourth resource is included in the resources corresponding to the feedback opportunity; if the first data is not successfully decoded, send negative acknowledgment NACK information on a fifth resource, where the fifth resource is a resource in the second resource, the fifth resource is frequency-division multiplexed or code-division multiplexed with the fourth resource, and the second resource is included in the resources corresponding to the feedback opportunity.

In the embodiment of the present application, the feedback opportunity may be a PSFCH transmission opportunity, and the resource corresponding to the feedback opportunity is the PSFCH resource included in the time slot including the PSFCH resource. Or the feedback opportunity may be a PSFCH symbol, and the resource corresponding to the feedback opportunity is all PRBs or PRB sets included in the PSFCH symbol. The first information may be ACK information or NACK information, or any other information. The first information is not limited here. The first data is multicast data, and the terminal device decodes the first data after receiving the first data. In the case of successful decoding, the first information is sent on the fourth resource so that the channel can be occupied, thereby avoiding the interruption of the channel occupation time due to the unused PSFCH resource due to the successful decoding of the first data by the receiving end in the multicast data transmission, thereby ensuring the continuity of the channel occupation time.

In combination with the third aspect, in a possible implementation method, the fourth resource is a public resource, and the fourth resource is used to transmit the first information sent by a terminal device that successfully decodes the first data, or the fourth resource is used to transmit the first information sent by a terminal device that detects side control information SCI that schedules the first data.

In combination with the third aspect, in a possible implementation manner, the fifth resource is a public resource, and the fifth resource is used to transmit the first information sent by the terminal device that successfully decodes the first data.

In an embodiment of the present application, the first data is multicast data and may correspond to multiple receiving terminal devices. The fourth resource is a public resource, and the terminal device that successfully decodes the first data may send the first information on the fourth resource. Alternatively, the terminal device that detects the SCI that schedules the first data may send the first information on the fourth resource. The first information may be transmitted in the public resource to avoid overlapping of the resources for transmitting the first information with the resources for transmitting the NACK information, so as to facilitate resource management, and utilize the public resource to meet the OCB requirements or occupy the channel, so as to save feedback resources as much as possible.

In combination with the third aspect, in a possible implementation manner, the fourth resource is included in the second resource, and the position of the fourth resource on the second resource is determined by the source identifier and the offset.

In conjunction with the third aspect, in a possible implementation manner, the index of the fourth resource on the second resource satisfies: index2=(ID+offset)mod M, wherein the index2 is the index of the fourth resource, the ID is the source identifier, the offset is the offset, and M is the number of resources included in the second resource. The offset may be preconfigured, or preset, or configured by a network device.

In combination with the third aspect, in a possible implementation manner, the position of the fourth resource in the resources corresponding to the feedback opportunity is preconfigured or configured by the network device.

In combination with the third aspect, the fourth resource is indicated by a bitmap.

In combination with the third aspect, in a possible implementation manner, sending the first information on the fourth resource includes: sending the first information on the fourth resource when at least one of the second conditions is met; the second condition includes:

The data transmitted in at least one PSSCH time slot associated with the time slot where the fourth resource is located includes multicast data and/or unicast data in which the feedback mode is ACK information or NACK information, and the second-level SCI corresponding to the first data indicates that HARQ is disabled; or,

The data transmitted in at least one PSSCH time slot associated with the time slot where the fourth resource is located includes broadcast data. Or,

The data transmitted in at least one PSSCH time slot associated with the time slot where the fourth resource is located includes multicast data with a feedback mode of NACK only. That is, the data transmission in at least one PSSCH time slot associated with the time slot where the fourth resource is located does not include multicast and/or unicast with a feedback mode of ACK information or NACK information, and the corresponding second-level SCI indicates HARQ is enabled.

In an embodiment of the present application, the time slot where the fourth resource is located may be the above-mentioned feedback opportunity, or include the feedback opportunity. The meaning of the at least one PSSCH time slot associated with the time slot where the fourth resource is located is that the HARQ information corresponding to the data transmission in the at least one PSSCH time slot is transmitted in the time slot where the fourth resource is located. Through the second condition, it can be determined whether there is a PSFCH transmission in the PSFCH symbol. In the absence of a confirmed PSFCH transmission, sending the first information can achieve the purpose of occupying the channel and avoid channel interruption. When it is determined that there is a PSFCH transmission in the PSFCH symbol, since the channel is already occupied by the PSFCH transmission, there is no need to send the first information to occupy the channel, which can save signaling overhead.

In a fourth aspect, an embodiment of the present application provides a communication device, which is used to execute the method in the first aspect or any possible implementation. The communication device includes a unit having the function of executing the method in the first aspect or any possible implementation.

In a fifth aspect, an embodiment of the present application provides a communication device, which is used to execute the method in the second aspect or any possible implementation. The communication device includes a unit having the function of executing the method in the second aspect or any possible implementation.

In a sixth aspect, an embodiment of the present application provides a communication device, which is used to execute the method in the third aspect or any possible implementation. The communication device includes a unit having the function of executing the method in the third aspect or any possible implementation.

In a seventh aspect, an embodiment of the present application provides a communication device, the communication device comprising a processor, configured to execute the method described in the first aspect or any possible implementation. Alternatively, the processor is configured to execute a program stored in a memory, and when the program is executed, the method described in the first aspect or any possible implementation is executed.

In a possible implementation manner, the memory is located outside the above communication device.

In a possible implementation manner, the memory is located within the above-mentioned communication device.

In the embodiment of the present application, the processor and the memory may also be integrated into one device, that is, the processor and the memory may also be integrated together.

In a possible implementation, the communication device further includes a transceiver, where the transceiver is used to receive a signal or send a signal.

In an eighth aspect, an embodiment of the present application provides a communication device, the communication device comprising a processor, configured to execute the method described in the second aspect or any possible implementation. Alternatively, the processor is configured to execute a program stored in a memory, and when the program is executed, the method described in the second aspect or any possible implementation is executed.

In a ninth aspect, an embodiment of the present application provides a communication device, the communication device comprising a processor, configured to execute the method described in the third aspect or any possible implementation. Alternatively, the processor is configured to execute a program stored in a memory, and when the program is executed, the method described in the third aspect or any possible implementation is executed.

In the tenth aspect, an embodiment of the present application provides a communication device, which includes a logic circuit and an interface, wherein the logic circuit and the interface are coupled; the logic circuit is used to determine at least one time slot and a first resource; and the interface is used to output first data and input feedback information of the first data.

It can be understood that the description of at least one time slot, the first resource, the first data and the feedback information of the first data can refer to the method shown in the first aspect or any possible implementation method, and will not be described in detail here.

In the eleventh aspect, an embodiment of the present application provides a communication device, which includes a logic circuit and an interface, wherein the logic circuit and the interface are coupled; the logic circuit is used to determine at least one time slot and a first resource; and the interface is used to input first data and feedback information of the input first data.

It can be understood that the description of at least one time slot, the first resource, the first data and the feedback information of the first data can refer to the method shown in the second aspect or any possible implementation method, and will not be described in detail here.

In a twelfth aspect, an embodiment of the present application provides a communication device, which includes a logic circuit and an interface, wherein the logic circuit and the interface are coupled; the interface is used to input first data and output first information or output NACK information.

It can be understood that the description of the first data, the first information and the NACK information can refer to the method shown in the third aspect or any possible implementation method, and will not be described in detail here.

In a thirteenth aspect, an embodiment of the present application provides a computer-readable storage medium, which is used to store a computer program. When the computer-readable storage medium is run on a computer, the method shown in the above-mentioned first aspect or any possible implementation of the first aspect is executed.

In a fourteenth aspect, an embodiment of the present application provides a computer-readable storage medium, which is used to store a computer program. When the computer-readable storage medium is run on a computer, the method shown in the above-mentioned second aspect or any possible implementation of the second aspect is executed.

In a fifteenth aspect, an embodiment of the present application provides a computer-readable storage medium, which is used to store a computer program. When the computer-readable storage medium is run on a computer, the method shown in the above-mentioned third aspect or any possible implementation of the third aspect is executed.

In the sixteenth aspect, an embodiment of the present application provides a computer program product, which includes a computer program or a computer code. When the computer program product runs on a computer, the method shown in the above-mentioned first aspect or any possible implementation of the first aspect is executed.

In the seventeenth aspect, an embodiment of the present application provides a computer program product, which includes a computer program or a computer code. When the computer program product runs on a computer, the method shown in the above-mentioned second aspect or any possible implementation of the second aspect is executed.

In the eighteenth aspect, an embodiment of the present application provides a computer program product, which includes a computer program or a computer code. When the computer program product runs on a computer, the method shown in the above-mentioned third aspect or any possible implementation of the third aspect is executed.

In the nineteenth aspect, an embodiment of the present application provides a computer program. When the computer program runs on a computer, the method shown in the above-mentioned first aspect or any possible implementation of the first aspect is executed.

In the twentieth aspect, an embodiment of the present application provides a computer program. When the computer program runs on a computer, the method shown in the above-mentioned second aspect or any possible implementation of the second aspect is executed.

In the twenty-first aspect, an embodiment of the present application provides a computer program. When the computer program runs on a computer, the method shown in the above-mentioned third aspect or any possible implementation of the third aspect is executed.

In the twenty-second aspect, an embodiment of the present application provides a communication system, which includes a first communication device and a second communication device, the first communication device is used to execute the method shown in the above-mentioned first aspect or any possible implementation of the first aspect, the second communication device is used to execute the method shown in the above-mentioned second aspect or any possible implementation of the second aspect, or the second communication device is used to execute the method shown in the above-mentioned third aspect or any possible implementation of the third aspect.

BRIEF DESCRIPTION OF THE DRAWINGS

In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings required for use in the embodiments of the present application will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

FIG1 is a schematic diagram of the structure of a detection window provided in an embodiment of the present application;

FIG2A is a schematic diagram of the structure of another detection window provided in an embodiment of the present application;

FIG2B is a schematic diagram of the structure of another detection window provided in an embodiment of the present application;

FIG2C is a time axis diagram of a transmission provided by an embodiment of the present application;

FIG3A is a schematic diagram of a scenario of terminal direct communication provided in an embodiment of the present application;

FIG3B is a schematic diagram of a scenario of a vehicle network provided in an embodiment of the present application;

FIG3C is a schematic diagram of another scenario of terminal direct communication provided in an embodiment of the present application;

FIG3D is a schematic diagram of a V2X communication scenario provided in an embodiment of the present application;

FIG3E is a schematic diagram of a WiFi communication scenario provided by an embodiment of the present application;

FIG4 is a schematic diagram of a structure of PSCCH and PSSCH multiplexing provided in an embodiment of the present application;

FIG5 is a schematic diagram of the structure of a resource pool provided in an embodiment of the present application;

FIG6 is a schematic diagram of the structure of a resource pool including PSFCH resources provided in an embodiment of the present application;

FIG7 is a schematic diagram of the structure of a time slot provided in an embodiment of the present application;

FIG8 is an example of a PSFCH symbol provided in an embodiment of the present application;

FIG9 is a schematic diagram of an interleaving structure provided in an embodiment of the present application;

FIG10 is an interactive schematic diagram of a communication method provided in an embodiment of the present application;

FIG11 is a schematic diagram of a resource mapping provided in an embodiment of the present application;

FIG12A is a schematic diagram of an index of a terminal device provided in an embodiment of the present application;

FIG12B is a schematic diagram of an index of another terminal device provided in an embodiment of the present application;

FIG13 is a schematic diagram of a correspondence between at least one time slot and a first resource provided in an embodiment of the present application;

FIG14 is a flow chart of another communication method provided in an embodiment of the present application;

FIG15 is a flow chart of another communication method provided in an embodiment of the present application;

FIG16 is a schematic diagram of the structure of a communication device provided in an embodiment of the present application;

FIG17 is a schematic diagram of the structure of another communication device provided in an embodiment of the present application;

FIG. 18 is a schematic diagram of the structure of another communication device provided in an embodiment of the present application.

Detailed ways

The terms "first" and "second" and the like in the specification, claims and drawings of the present application are only used to distinguish different objects, and are not used to limit the order, timing, priority or importance of multiple objects. In the embodiments of the present application, "multiple" refers to two or more. In addition, the terms "including" and "having" and any variations thereof are intended to cover non-exclusive inclusions. For example, a process, method, system, product or device that includes a series of steps or units is not limited to the listed steps or units, but may optionally include 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. In addition, the character "/", such as Unless otherwise specified, it generally indicates that the previous and subsequent related objects are in an "or" relationship.

The "embodiment" mentioned in this article means that the specific features, structures or characteristics described in conjunction with the embodiment can be included in at least one embodiment of the present application. The appearance of this phrase in various places in the specification does not necessarily refer to the same embodiment, nor is it an independent or alternative embodiment that is mutually exclusive with other embodiments. It can be explicitly and implicitly understood by those skilled in the art that the embodiments described herein can be combined with other embodiments.

Before introducing the present application, some terms in the embodiments of the present application are briefly explained to facilitate understanding by those skilled in the art.

(1) Listen before talk (LBT)

LBT is a channel access mechanism that enables wireless local area networks to effectively share the same spectrum resources. Since the availability of channels in unlicensed frequency bands cannot be guaranteed at all times, LBT requires the communication device to monitor the channel before transmitting data and perform a clear channel assessment (CCA). Data transmission is performed only when the channel is guaranteed to be idle. For example, the communication device can be a standardized base station or terminal equipment.

The channel access process of wireless communication in unlicensed spectrum (new radio in unlicensed band, NR-U) is mainly the process of a communication device obtaining a channel access opportunity in an unlicensed band to perform data transmission. Exemplarily, the channel access mode of unlicensed spectrum can include load-based equipment (load-based equipment, LBE) and frame-based equipment (frame-based equipment, FBE). The communication device can determine the channel access mode it uses based on the radio resource control (radio resource control, RRC) configuration.

For example, LBE is a very important channel assessment and access mechanism in NR-U, and is the key to whether NR-U can achieve fair coexistence with other systems. The FBE mechanism is mainly applicable to environments where WiFi does not exist, and there is only a single NR-U network in the geographical area of the frequency band used, such as an independently deployed factory environment.

The types of LBT may include a first type (type1) LBT and a second type (type2) LBT. The type1 LBT may also be referred to as a random backoff LBT with a non-fixed length contention window. The type1 LBT includes a first part and a second part, the first part including a channel detection of length Td, that is, the communication device detects whether the channel is idle through a detection window of length Td. The Td may include multiple Ts1s and one Tf. Exemplarily, FIG1 is an example of the detection window, as shown in FIG1, Td may include mP Ts1s and one Tf, that is, Td=Tf+mP*TS1. Among them, the Ts1 may be 9 milliseconds, Tf may be 16 milliseconds, and the mP is determined by the channel access priority class (CAPC) of the communication device.

When the detection time in the detection window is idle, the second part is entered. The communication device performs cyclic detection in the second part. The duration of the cyclic detection in the second part is related to N. The initial value of N is a random number between 0 and CWp, and the CWp is determined by CAPC.

Exemplarily, the mapping relationship between mP, CWp and the CAPC can be as shown in Table 1, and the value of CWp is between CWp _min and CWp _max , and can be a value in the CWp range (allowed CWp sizes). For example, when the CAPC of the communication device is 1, the mP can be 1, and the CWp can be 3 or 7.

Table 1

It can be understood that the mapping relationship between mP, CWp and the CAPC shown in Table 1 is only an example, and Table 1 should not be understood as a limitation to the present application.

Exemplarily, type2 LBT may include a first type2 LBT (type2A LBT), a second type2 LBT (type2B LBT) and a third type2 LBT (type2C LBT). Among them, in type2A LBT, the communication device detects whether the channel is idle through two 9μs detection windows within a gap of 25 microseconds (μs). As shown in Figure 2A, the detection window can be 9μs before and after the gap. When the detection results of the two detection windows are both idle, that is, the detection power of at least 4μs in the two detection windows is lower than the energy detection threshold, the communication device determines that the channel is idle and can send data on the unlicensed spectrum.

In type2B LBT, as shown in FIG2B , the communication device detects whether the channel is idle in the last 9us of the 16μs gap, and detects at least 5μs in the 9μs. The communication device determines that the channel is idle if it detects that the detection result is idle for at least 4μs.

In type2C LBT, as shown in FIG2C , when the first time interval is less than 16 μs, the communication device does not need to perform LBT to directly access the channel. The first time interval is the time interval between the end time of the transmission (transmission 1) before the communication device accesses the channel and the start time of the transmission (transmission 2) after the communication device accesses the channel. In this case, the communication device can use up to 584 μs for transmission.

(2) Channel occupied time (COT)

The channel occupancy time is the time that the communication device can continuously occupy the channel after successfully accessing the channel. The channel occupancy time of the communication device can be determined by the channel access priority level of the communication device. The mapping relationship between the channel access priority level of the communication device and the channel occupancy time is shown in Table 1. The maximum duration that can be occupied under different CAPCs is different. For example, if the CAPC of the communication device is 1, the COT of the communication device is 2 milliseconds (ms). In NR-U, CAPC can be determined by downlink control information (DCI).

The technical solution provided in the embodiments of the present application can be applied to various communication systems, such as terminal direct communication (sidelink communication), Internet of Vehicles, cellular communication (including 5G new radio (NR) communication, LTE) and WiFi communication system, etc. The Internet of Vehicles can include vehicle to everything (V2X) communication, long-term evolution-vehicle communication (LTE-V), next-generation communication-based vehicle communication technology (new radio-vehicle, NR-V), vehicle to vehicle (V2V) communication, sidelink communication in unlicensed spectrum, etc.

As shown in FIG. 3A or FIG. 3B , in terminal direct communication (sidelink communication) or vehicle networking, the terminal device can communicate via a sidelink (SL) when there is no network coverage. The terminal device can also be located within the coverage of the network device, and the terminal device within the coverage can also communicate directly with the terminal device outside the coverage (i.e., sidelink communication). As shown in FIG. 3C , the terminal direct communication can include communication between a virtual reality (VR) device, an augmented reality (AR) device, or a mixed reality (MR) device and a processing device or a display device.

The terminal device involved in the present application may be a device that includes a wireless transceiver function and can provide communication services for users. Specifically, the terminal device may be a device in a V2X system, a device in a D2D system, a device in an MTC system, etc. For example, the terminal device may refer to an industrial robot, an industrial automation device, a user equipment (User Equipment, UE), 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 terminal device, a mobile terminal MS, a CPE, a vehicle-mounted terminal, a user agent or a user device. For example, the terminal device may be a cellular phone, a cordless phone, a Session Initiation Protocol (Session Initiation Protocol, SIP) phone, a Wireless Local Loop (Wireless Local Loop, WLL) station, a Personal Digital Assistant (Personal Digital Assistant, PDA), a handheld device with a wireless communication function, a computing device or other processing device connected to a wireless modem, a vehicle-mounted device, a wearable device, a terminal device in a 5G network or a network after 5G or a terminal device in a future evolved PLMN network, etc., and this application does not limit this.

The network device in the embodiment of the present application may be a device that connects a terminal device to a wireless network, specifically a base station. The base station may include various forms of base stations, such as: macro base stations, micro base stations (also called small stations), relay stations, access points, etc., or relay stations or access points, or vehicle-mounted devices, wearable devices, and the next generation Node B (the next generation Node B, gNB) in the 5G system or base stations in the future evolved PLMN network, etc. In one possible way, the network device may be a base station (such as gNB) with a centralized unit (CU) and a distributed unit (DU) separated architecture. The network device may also refer to a network device that implements the communication function of the present application, such as a communication module or a communication chip therein.

The network elements involved in this application include user equipment, AR/VR/XR equipment, wearable devices, smart home appliance terminals, terminal devices and communication modules of terminal devices, mobile phones and communication modules in mobile phones, vehicles and communication modules in vehicles, information processing equipment, display equipment, network equipment, base stations, TRP, CPE, routers, network access equipment, etc., etc.

V2X communication refers to the communication between a vehicle and anything in the outside world. As shown in Figure 3D, V2X can include vehicle-to-vehicle (V2V) communication, vehicle-to-infrastructure (V2I) communication, vehicle-to-pedestrian (V2P) direct communication, and vehicle-to-network (V2N) communication.

Alternatively, the technical solution provided in the embodiment of the present application can also be applied to WiFi communication scenarios. As shown in Figure 3E, the terminal device and the router or access network device can communicate through an uplink or a downlink, and the terminal devices can communicate with each other through a side link.

Considering the air interface transmission from universal terrestrial radio access network (UTRAN) to terminal equipment (UTRAN-to-UE, Uu), the two parties of wireless communication include network equipment and user communication equipment; considering SL air interface transmission, the transceiver of wireless communication is user communication equipment. Network equipment can be a traditional macro base station (evolved node B, eNB) in the traditional universal mobile telecommunications system (UMTS)/long term evolution (LTE) wireless communication system, a micro base station eNB in the heterogeneous network (HetNet) scenario, a baseband unit (BBU) and a remote radio unit (RRU) in the distributed base station scenario, a baseband pool BBU pool and a radio unit RRU in the cloud radio access network (CRAN) scenario, and a gNB in the future wireless communication system. The user communication device can be a vehicle-mounted communication module or other embedded communication module, or a user handheld communication device, including a mobile phone, a tablet computer, etc. The network elements involved in the present invention are mainly V terminal devices (vehicle user equipment).

The following uses NR-V as an example to introduce the application scenario of the technical solution of the embodiment of the present application.

The channels supported in NR-V may include a physical sidelink control channel (PSCCH), a physical sidelink shared channel (PSSCH), and a physical sidelink feedback channel (PSFCH). The PSCCH may include sidelink control information (SCI), which includes fields required for decoding data. The PSSCH is used to carry the second-level SCI and data, or the PSSCH may also carry a media access control element (MAC CE). The PSFCH is used to carry hybrid auto repeat request (HARQ) information, and the HARQ information includes an acknowledgment (ACK) or a negative acknowledgment (NACK).

Exemplarily, NR-V may support broadcast, unicast and multicast communication modes. Among them, unicast and multicast support HARQ feedback, and broadcast does not support HARQ feedback. Exemplarily, the unicast supports HARQ feedback of ACK or NACK. The feedback mode supported by the multicast may include a multicast feedback mode of only feeding back NACK and a multicast feedback mode of feeding back ACK or NACK. Exemplarily, data transmission that does not support HARQ feedback adopts a blind retransmission mode, that is, the transmitter repeatedly sends data multiple times without HARQ feedback.

The frequency domain resource unit used for PSSCH transmission in NR-V is a subchannel, and the time domain resource unit is a time slot. A subchannel includes Y physical resource blocks (PRBs). As shown in Figure 4, PSCCH and PSSCH can be multiplexed, and the number of PRBs used to transmit PSCCH is Z PRBs, where the values of Y and Z are configured or preconfigured by the base station. One or more subchannels are used to transmit PSSCH, that is, the number of PRBs used to transmit PSSCH is one or more Y PRBs.

In NR-V, the terminal device can perform sidelink communication in a resource pool, which is a collection of time-frequency resources for sidelink communication. As shown in Figure 5, the resource pool may include multiple PRBs. The number of PRBs included in the resource pool is configured or preconfigured by the base station. In this application, PRB may also be referred to as a resource block (RB). The sidelink may also be referred to as a sidelink, a sidelink, an edge link, etc.

Exemplarily, the resources used to transmit PSFCH can be called PSFCH resources. PSFCH resources are periodically configured on the resource pool. Exemplarily, the configuration period N of the PSFCH resource can be 0, 1, 2, 4, that is, one PSFCH resource is configured for every N time slots in the resource pool. As shown in Figure 6, when the configuration period is 0, the resource pool does not include PSFCH resources. When the configuration period is N=1, each time slot in the resource pool includes a PSFCH resource. When the configuration period is N=2, one PSFCH resource is included for every 2 time slots in the resource pool; when the configuration period is N=4, one PSFCH resource is included for every 4 time slots in the resource pool.

Exemplarily, the terminal device may transmit PSFCH using PSFCH format 0, which is a sequence, and occupies one PRB to transmit the PSFCH format 0. The position of the PSFCH resource in the time slot may be a symbol in the time slot, and the PSFCH resource may also be called a PSFCH symbol.

Exemplarily, a time slot may include 14 symbols. The time slot may include a normal cyclic prefix (NCP). One symbol in the time slot is a PSFCH symbol, which is used to transmit PSFCH. As shown in Figure 7, symbol 12 is a PSFCH symbol, which is used to transmit PSFCH. Symbol 11 is a copy of symbol 12 and is used for automatic gain control (AGC). Symbol 10 and symbol 13 are GAP symbols (or GP symbols), which are used for transceiver conversion of terminal equipment, or potential transceiver conversion. Exemplarily, symbols 1 to 9 are used to transmit PSCCH.

A PSFCH symbol may include multiple PRBs, and a PRB set for transmitting PSFCH in the multiple PRBs may be configured by an RRC parameter. For example, the RRC parameter includes a bitmap, which is used to indicate a PRB set for transmitting PSFCH in the multiple PRBs included in the PSFCH symbol. For example, as shown in FIG8 , the PSFCH symbol may include 20 PRBs, of which 12 PRBs are configured for transmitting PSFCH (shown by gray boxes in FIG8 ).

In NR-V, in order to meet the requirements of occupied channel bandwidth (OCB), the frequency domain unit corresponding to the data that the terminal device needs to send on the unlicensed spectrum is interlace, that is, the terminal device transmits PSSCH or PSFCH on the interlace. This interlace can also be called interleaving. Interlace is a set of PRBs, and the PRBs in an interlace are discrete and equally spaced on the PSFCH resources. As shown in Figure 9, Figure 9 takes the configuration of interlace at 20M bandwidth and 30kHz as an example. The number of PRBs included in the PSFCH resource is 52, and the number of interlaces is 5, where the number of PRBs included in each interlace is 11 or 10. That is, the number of PRBs included in different interlaces is either 0 or 1.

Exemplarily, the number of PRBs included in the PSFCH resource is M _all , and the total number of interlaces included in the PSFCH resource is M _number . The index of a PRB in one interlace in M _all PRBs may be x, x+M _number , x+2*M _number , x+3*M _number , ..., x+i*M _number . That is, the interval of PRBs in the interlace is equally spaced, for example, the interval may be M _number . Among them, for the first mod(M _all ,M _number ) interlaces in the M _number interlaces, the value of i is: For the rest of the interlace, the value of i is As shown in FIG. 9 , the interlace with index 1 has 52 PRBs with indexes 0, 5, ..., 45, 50.

For example, when the transmitting end schedules data, the SCI may carry a HARQ enable/disable field to indicate whether the data scheduled by the SCI supports HARQ feedback. If the data scheduled by the SCI supports HARQ feedback, the receiving end will feedback the corresponding HARQ on the PSFCH resource after receiving the data; if the data scheduled by the SCI does not support HARQ feedback, the receiving end will not feedback HARQ after receiving the data. In the above manner, the transmitting end and the receiving end cannot determine the resources used for the feedback HARQ, so the transmitting end may not be able to receive the HARQ.

In view of this, the embodiments of the present application provide a communication method and a communication device, which can ensure that the data transmitter receives feedback information corresponding to the data. The method provided by the embodiments of the present application can be applied to the communication system shown in Figures 3A to 3E, or the method provided by the embodiments of the present application can be applied to the first terminal device and the second terminal device.

Please refer to Figure 10, which is an interactive schematic diagram of a communication method provided in an embodiment of the present application. As shown in Figure 10, the method includes but is not limited to the following steps.

1001. A first terminal device determines at least one time slot and a first resource, wherein the at least one time slot is used to transmit data, and the first resource is used to transmit feedback information of the data transmitted in the at least one time slot.

Exemplarily, the at least one time slot corresponds to the first resource, that is, the feedback information of the data transmitted in the at least one time slot needs to be transmitted on the first resource. Exemplarily, the at least one time slot can be used to transmit PSSCH, and the first resource can be a PSFCH resource for transmitting PSFCH. Exemplarily, the first resource is included in the resources included in the PSFCH occasion (occasion), and the PSFCH occasion can also be called a PSFCH symbol. The PSFCH symbol occupies 1 symbol in the time domain. For example, the PSFCH symbol is the second to last symbol in a time slot. The previous symbol of the PSFCH symbol is a copy of the PSFCH symbol, which is used to adjust the AGC of the PSFCH.

In a possible implementation, the at least one time slot and the first resource may be determined by first indication information, where the first indication information is used to indicate a starting position and a length of occupied channel resources, and the number of terminal devices that share the channel resources.

Optionally, the occupied channel resources can be understood as the time-frequency resources corresponding to the channel occupancy (channel occupy, CO). The first indication information can be understood as COT indication information. The at least one time slot and the first resource can be determined by the first indication information, which can be understood as the at least one time slot and the first resource are located in the COT. According to the feedback timing relationship between PSSCH and PSFCH, the PSFCH time slot is the first time slot including PSFCH resources after the PSSCH time slot is K time slots apart. If the PSSCH time slot associated with the PSFCH time slot is not located in the COT, the PSSCH time slot is not included in at least one time slot (that is, at least one time slot is a PSSCH time slot in the COT associated with the PSFCH time slot).

The first indication information is used to indicate the starting position and length of the occupied channel resources, which can be understood as the first indication information indicating the position of the time-frequency resources corresponding to the CO. Exemplarily, the first indication information can be determined by the initial terminal device, which is a terminal device that successfully accesses the channel through LBT. After the initial terminal device successfully accesses the channel, the first indication information can be generated to send the starting position and length (i.e., the time-frequency resource position) of the occupied channel resources to the shared terminal device, so that the initial terminal device and the shared terminal device can communicate on the unlicensed spectrum and can use the channel resources together. Exemplarily, the first terminal device can be the above-mentioned initial terminal device or the shared terminal device. In the case where the first terminal device is the initial terminal device, the first indication information is generated by the first terminal device. In the case where the first terminal device is a shared terminal device, the first terminal device can receive the first indication information sent by the initial terminal device, and determine the at least one time slot and the first resource based on the first indication information.

Exemplarily, the frequency domain resources occupied by the initial terminal device after successfully accessing the channel are RB sets in the unlicensed spectrum. For example, the RB set can be 20 MHz. The above-mentioned first resource can be included in the PSFCH resources included in the PSFCH opportunity. That is, the first resource is all the PSFCH resources included in the PSFCH opportunity, or the first resource is the resource actually used to transmit HARQ in the PSFCH symbol. The frequency domain resources occupied by the PSFCH resource in the frequency domain are the RB set or a subset of the RB set. The PSFCH resource can be configured or pre-configured by the network device and can be indicated by a bit string. The bit string indicates that the unit of the PSFCH resource can be one or more of interleaving, subchannel, PRB, and RB set. Or all resources included in the default PSFCH symbol can be used to transmit PSFCH. The PSFCH opportunity can be indicated by the first indication information or indicated or pre-configured by the network device using RRC signaling, so that the first terminal device can determine the first resource from the PSFCH resource.

Exemplarily, the first indication information may be included in the SCI, that is, the initial terminal device may send the first indication information to the shared terminal device via the SCI. The SCI may be a first-level SCI or a second-level SCI.

In another possible implementation, the first terminal device may determine the at least one time slot and the first resource according to feedback timing.

Exemplarily, the feedback timing is the feedback timing from PSSCH to PSFCH, which is used to indicate the time interval between PSSCH and PSFCH. The feedback timing may also be referred to as feedback delay. The first terminal device may determine the time slot (timing) where the first resource is located based on the at least one time slot and the feedback timing. For example, assuming that the feedback timing is K, and the first terminal device receives PSSCH in time slot n, the terminal device feeds back HARQ information corresponding to PSSCH in the first time slot including PSFCH resources in time slot n+K and subsequent time slots. Exemplarily, the feedback timing K may be 2 or 3.

For example, as shown in FIG8 , assuming that the feedback timing from PSSCH to PSFCH is 2, the first terminal device receives data in time slot n, and can feedback the corresponding HARQ information at the earliest in time slot n+2, but there is no PSFCH resource in time slot n+2, then the first terminal device feedbacks the corresponding HARQ information in the first time slot n+3 including PSFCH resources after time slot n+2. The first terminal device receives data in time slot n+1, and then feedbacks the corresponding HARQ information in time slot n+3. That is, the at least one time slot includes the time slot n and time slot n+1, and the time slot corresponding to the first resource is time slot n+3. The first resource includes the resources configured for transmitting PSFCH in the PSFCH symbol on time slot n+3.

Exemplarily, in this implementation, the PSFCH resource may be periodically configured, and the number of time slots of the at least one time slot is related to the configuration period of the PSFCH resource. For example, if the configuration period of the PSFCH resource is 4, then the at least one time slot may include 4 time slots. Alternatively, if 3 of the 4 time slots are within the COT, then at least one time slot is 3 time slots within the COT.

1002. A second terminal device determines at least one time slot and a first resource.

It can be understood that the specific implementation method of the second terminal device determining at least one time slot and the first resource can refer to the relevant description of step 1001, which will not be described in detail here.

It is understandable that the second terminal device and the first terminal device have the same understanding on how to determine at least one time slot and the first resource, that is, the second terminal device and the first terminal device use the same method to determine at least one time slot and the first resource.

It is understandable that the above step 1001 can be performed before step 1002 or after step 1002, and this application does not impose any limitation.

1003. The first terminal device sends first data in a first time slot, and correspondingly, the second terminal device receives the first data in the first time slot, and the first time slot is included in the at least one time slot mentioned above.

1004. The second terminal device sends feedback information of the first data on the second resource. Correspondingly, the first terminal device receives feedback information of the first data on the second resource, and the second resource is included in the first resource.

Exemplarily, the feedback information of the first data may include ACK information or NACK information. For example, if the second terminal device successfully decodes the first data, the feedback information of the first data includes ACK information; if the second terminal device fails to successfully decode the first data, the feedback information of the first data includes NACK information.

Exemplarily, during multicast, if the second terminal device fails to decode the first data successfully, the feedback information of the first data includes NACK information. If the second terminal device successfully decodes the first data, no information is fed back.

In the embodiment of the present application, the at least one time slot has a corresponding relationship with the first resource, and the data transmitted in the at least one time slot needs to be fed back on the first resource. Based on the corresponding relationship between the at least one time slot and the first resource, the second resource corresponding to the first data can be determined from the first resource, so that the terminal device sending the first data can receive feedback information of the first data on the second resource.

In order to describe the above second resource in more detail, the embodiment of the present application also provides the following implementation methods:

Implementation method 1: The second resource is determined based on a mapping relationship between resources included in at least one time slot and the first resource.

Exemplarily, the resources included in the at least one time slot are resources for transmitting PSSCH, and the first resources are resources for transmitting PSFCH.

After the first terminal device determines the time slot for feedback HARQ based on the feedback timing from PSSCH to PSFCH, it also needs to determine the frequency domain resources and/or code domain resources used in the time slot. Exemplarily, the terminal device can determine the frequency domain and code domain resources of PSFCH based on the time-frequency resources of PSSCH. For example, the terminal device can determine the frequency domain resources and/or code domain resources used for feedback HARQ in the time slot where PSFCH is located based on the interlace of the time-frequency resources occupied by PSSCH and the time slot in which it is located. Interlace includes one or more PRBs. It can be understood as interleaving, or subchannels. A subchannel may include one or more interleavings.

For example, as shown in FIG11, according to the feedback timing from PSSCH to PSFCH, the HARQ information corresponding to the data transmission in time slot 0 and time slot 1 should be fed back in time slot 3. Among them, the mapping relationship between the "single interlace-time slot" of time slot 0 and time slot 1 and the "PSFCH resource" in time slot n+3 is: a single interlace-time slot of PSSCH corresponds to one or more PRBs. As shown in FIG11, time slot 0 and time slot 1 include 4 "single interlace-time slots", and time slot 3 includes 2 PRBs configured for transmitting HARQ information, then each "single interlace-time slot" can be allocated 0.5 interlaces. Data transmitted on a "single interlace-time slot" of (0,0) needs to be fed back on the first 0.5 interlace; data transmitted on a "single interlace-time slot" of (0,1) needs to be fed back on the second 0.5 interlace; data transmitted on a "single interlace-time slot" of (1,0) needs to be fed back on the third 0.5 interlace; data transmitted on a "single interlace-time slot" of (1,1) needs to be fed back on the fourth 0.5 interlace.

Exemplarily, the first terminal device and the second terminal device can determine the second resource based on a single interleaving-time slot occupied by the first data. For example, in a single interleaving-time slot (0,0) and a single interleaving-time slot (1,0) occupied by the first data, the second resource includes the first 0.5 interleaving and the third 0.5 interleaving.

The PSFCH resources are periodically configured in the resource pool, and there is an associated mapping relationship between the PSSCH resources and the PSFCH resources, so the location of the PSFCH resources is implicitly determined based on the location of the PSSCH time-frequency resources. Therefore, the first terminal device and the second terminal device can determine the second resource corresponding to the first data based on the mapping relationship between the PSSCH resources and the PSFCH resources, thereby ensuring that the first terminal device can receive feedback information of the first data.

In some scenarios, the frequency domain granularity of the terminal device LBT is a PRB set (RB set), that is, the frequency domain resource occupied by the terminal device after accessing the channel is the RB set in the unlicensed spectrum, and the RB set can include multiple interlaces. In this scenario, the terminal device only sends one data in a time slot. When the number of interlaces occupied by the data sent by the terminal device is less than the number of interlaces contained in the RB set, it will cause a waste of resources. For example, the number of interlaces occupied by the data sent by the terminal device is 1, and the number of interlaces contained in the RB set is 5. Based on Under the mapping rule of interlace-to-PSFCH resources, the PSFCH resources corresponding to the remaining four interlaces will not be used, which results in a waste of resources.

Implementation method 2: The second resource is determined based on the first resource, the number of at least one time slot and the number of terminal devices, where the number of terminal devices is the number of terminal devices corresponding to at least one time slot or the number of terminal devices corresponding to the first time slot.

Exemplarily, the number of terminal devices corresponding to the at least one time slot is the number of terminal devices that send data in the at least one time slot, and the number of terminal devices corresponding to the first time slot is the number of terminal devices that send data in the first time slot. The number of the at least one time slot is the number of time slots included in the at least one time slot.

Exemplarily, the number of terminal devices may be determined by the first indication information. The first indication information may be used to indicate the at least one time slot and the terminal device that sends data in the at least one time slot. For example, the first indication information indicates that the first terminal device sends data in the first time slot, and the first terminal device may send the first data in the first time slot based on the first indication information.

Exemplarily, the number of terminal devices can be obtained through the first indication information. After the initial terminal device LBT successfully accesses the channel, it sends the first indication information, which indicates the occupied channel resources and the identification information of the terminal devices that can share the occupied channel resources and the corresponding resource locations. Or the number of terminal devices is determined by the response information of a third terminal device that has reserved resources. Optionally, the reserved resources of the third terminal device are located in the channel resources, and the initial terminal device sends the response information to the third terminal device, which indicates whether the third terminal device can use the reserved resources. The first terminal device and the second terminal device can determine the number of terminal devices based on the number of reserved resources that can be used in the third terminal device.

The first terminal device and the second terminal device can determine the number of terminal devices in at least one time slot or the number of terminal devices in the first time slot according to the identification information of the terminal devices that can share the occupied channel resources and the corresponding resource locations in the first indication information. The first indication information can indicate the terminal devices that share the channel resources.

Specifically, the first indication information includes identification information of the shared terminal device. The number of terminal devices sharing the channel resource can be determined based on the identification information. For example, the first indication information carries 3 groups of identification information, each group of identification information is used to indicate a terminal device, then the terminal device receiving the first indication information can determine that the number of terminal devices sharing the channel resource is 3.

Optionally, the first indication information may indicate the terminal devices that share the channel resource and the locations of the time-frequency resources used by them. The terminal device that receives the first indication information may determine the number of terminal devices that share the channel resource in each time slot in the channel resource.

Optionally, setting the corresponding field of the identification information to 0 indicates that the field does not indicate a shared terminal device.

It can be understood that regarding the number of terminal devices, the embodiments of the present application provide the following examples.

Example 1: The number of terminal devices is the number of terminal devices corresponding to the first time slot.

Exemplarily, the first terminal device and the second terminal device may determine the third resource corresponding to the first time slot from the first resource according to the number of at least one time slot; and determine the second resource from the third resource according to the number of the terminal devices.

Exemplarily, when the first terminal device is an initial terminal device, only the first terminal device sends data in the first time slot, that is, the number of terminal devices corresponding to the first time slot is 1.

In an embodiment of the present application, the first resource can be allocated to each time slot in the at least one time slot according to the number of at least one time slot. Exemplarily, the number of resources corresponding to each time slot in the at least one time slot is equal (evenly distributed). That is, the number of resources contained in the third resource is the number of resources contained in the first resource divided by the number of the at least one time slot. If the number of resources contained in the first resource cannot divide the number of the at least one time slot, it is divided as evenly as possible. That is, the number of resources contained in the third resource corresponding to different time slots differs by either 0 or 1. The resource is a symbol in the time domain and a channel or an interleave in the frequency domain. The code domain corresponds to a cyclic shift pair or a frequency domain orthogonal cover code.

After the first terminal device and the second terminal device divide the first resource equally according to the number of at least one time slot, the third resource corresponding to the first time slot can be determined. The first terminal device and the second terminal device then allocate the third resource to each terminal device corresponding to the first time slot according to the number of terminal devices corresponding to the first time slot (that is, the resources used by the HARQ information corresponding to the data transmitted by each terminal device in the first time slot, and each terminal device receives the HARQ information corresponding to the data on the corresponding resources), thereby determining the second resource corresponding to the terminal device of the first data. The terminal device of the first data is the terminal device that sends the first data, that is, the first terminal device.

Exemplarily, the position of the third resource in the first resource is determined by the index of the first time slot in the at least one time slot. The position of the second resource in the third resource is determined by the index of the first terminal device in the terminal device corresponding to the first time slot (the first terminal device in The position of the second resource in the third resource is determined by the index of the resource occupied by the terminal device of the first data in the resources included in the first time slot (i.e. the relative position of the first terminal device in at least one terminal device using the first time slot).

In a possible implementation manner, the first resource includes frequency domain resources, the third resource includes frequency domain resources, and the second resource includes frequency domain resources or frequency domain code domain resources.

Exemplarily, the first terminal device and the second terminal device may allocate corresponding frequency domain resources to each time slot in the at least one time slot according to the frequency domain resources of the first resource, that is, the frequency domain resources of the resources corresponding to each time slot in the at least one time slot are different, and the time domain resources are the same as the code domain resources. That is, the frequency domain resources of the third resource are included in the frequency domain resources of the first resource, and the code domain resources of the third resource are the same as the code domain resources of the first resource.

Exemplarily, the first terminal device and the second terminal device may evenly distribute the frequency domain resources of the first resource to each time slot in the at least one time slot, that is, the number of frequency domain resources included in the third resource is the number of frequency domain resources of the first resource divided by the number of the first time slots. For example, assuming that the first resource includes 12 interlaces and the number of the at least one time slot is 2, the resources corresponding to each time slot include 6 interlaces, that is, the third resource includes 6 interlaces. Assuming that the first resource includes 11 interlaces and the number of the at least one time slot is 2, the resources corresponding to the previous time slot include 6 interlaces, and the resources corresponding to the next time slot include 5 interlaces.

After determining the third resource corresponding to the first time slot, the first terminal device and the second terminal device may allocate the third resource to each terminal device (data of each terminal device) corresponding to the first time slot according to the number of terminal devices corresponding to the first time slot. When allocating the third resource, the first terminal device and the second terminal device may allocate it according to the frequency domain resource of the third resource, or allocate it according to the frequency domain and code domain resource of the third resource. For example, assuming that the third resource includes 6 interlaces in the frequency domain and 6 cyclic shift pairs (CS pairs) in the code domain, that is, the number of frequency domain resources of the third resource is 6, the number of frequency domain and code domain resources is 36, and the number of terminal devices corresponding to the first time slot is 3. In the case of allocating the resources corresponding to each terminal device according to the frequency domain resources of the third resource, the resources corresponding to each terminal device in the first time slot may include 2 interlaces, that is, the frequency domain resources included in the second resource are 2 interlaces. In this case, the resources corresponding to each terminal device include 6 cyclic shift pairs in the code domain. When the resources corresponding to each terminal device are allocated according to the frequency domain and code domain resources, the resources corresponding to each terminal device in the terminal device corresponding to the first time slot include 12 frequency domain and code domain resources, that is, the second resources include 12 frequency domain and code domain resources.

In another possible implementation manner, the first resource includes frequency domain and code domain resources, the third resource includes frequency domain and code domain resources, and the second resource includes frequency domain and code domain resources.

Exemplarily, the first terminal device and the second terminal device may allocate corresponding resources to each time slot in the at least one time slot according to the number of frequency domain code domain resources of the first resource. For example, the first terminal device and the second terminal device may evenly distribute the frequency domain code domain resources in the first resource to each time slot in the at least one time slot, that is, the number of frequency domain code domain resources included in the third resource is the number of frequency domain code domain resources included in the first resource divided by the number of the at least one time slot.

For example, assuming that the number of frequency-domain and code-domain resources included in the first resource is 72 and the number of the at least one time slot is 2, then the number of frequency-domain and code-domain resources included in the third resource is 36.

After determining the third resource, the first terminal device and the second terminal device may determine the second resource according to the number of frequency domain code domain resources contained in the third resource and the number of terminal devices corresponding to the first time slot. For example, the first terminal device and the second terminal device may evenly distribute the frequency domain code domain resources contained in the third resource to each terminal device in the terminal device corresponding to the first time slot. For example, if the number of frequency domain code domain resources contained in the third resource is 36 and the number of terminal devices corresponding to the first time slot is 3, then the number of frequency domain code domain resources contained in the second resource is 12.

In the present application, frequency domain and code domain resources can be sorted to facilitate allocation of the frequency domain and code domain resources to each terminal device. The frequency domain and code domain resources are sorted in ascending order by first index in the frequency domain and then index in the code domain; or, the frequency domain and code domain resources are sorted in ascending order by first index in the code domain and then index in the frequency domain.

In the embodiment of the present application, the first resource may be first allocated to each time slot in the at least one time slot according to the number of at least one time slot, and then the resource corresponding to the time slot may be allocated to each terminal device according to the number of terminal devices corresponding to the time slot, so that the third resource can be reasonably allocated. This enables the third resource to be fully utilized and avoids waste of resources.

In the embodiment of the present application, resources are allocated to a terminal device. It can be understood that HARQ information corresponding to the data of the terminal device can be transmitted on the resource, and the terminal device sending data can receive the HARQ information on the resource.

Example 2: The number of terminal devices is the number of terminal devices corresponding to at least one time slot.

Exemplarily, the position of the second resource in the first resource is determined by the index of the terminal device sending the first data in at least one terminal device corresponding to at least one time slot, that is, the position of the second resource in the first resource is determined by the index of the first terminal device in at least one terminal device.

In a possible implementation manner, the index of the first terminal device in the at least one terminal device satisfies:
k＝N1+y

Where k is the index of the first terminal device in at least one terminal device, N1 is the number of terminal devices corresponding to the time slots whose index in at least one time slot is less than the index of the first time slot, and y is the index of the frequency domain resource occupied by the first terminal device in the first time slot. k, N1, and y are positive integers.

The value range of y is 0 to the number of terminal devices corresponding to the first time slot. The value range of N1 is 0 to the number of terminal devices. Or the value of N1 is greater than 0, and less than or equal to the number of terminal devices minus the number of terminal devices corresponding to the time slot with the largest index in at least one time slot.

In this implementation, the at least one terminal device is sorted in ascending order by first sorting the frequency domain resources occupied by the terminal device in the time slot, and then sorting the time slot index in ascending order. For example, as shown in FIG12A, the terminal device in the at least one terminal device can be represented by (y, x), wherein y is the index of the frequency domain resources occupied by the terminal device in the corresponding time slot, and x is the index of the time slot corresponding to the terminal device in at least one time slot. Assuming that the number of the at least one time slot is 2, the first terminal device can be represented by (1,1), that is, the index of the first time slot is 1, and the index of the frequency domain resources occupied by the first terminal device in the first time slot is 1. Among them, the number of terminal devices corresponding to the first time slot is 2, and the number of terminal devices corresponding to the time slot with index 0 is 3, that is, N1 is 3, y is 1, and the index of the first terminal device in the at least one terminal device is 4.

It can be understood that when the index of the first time slot in at least one time slot is 0, N1 is 0.

In another possible implementation manner, the index of the first terminal device in at least one terminal device satisfies:
k＝N2+x

Wherein, k is the index of the first terminal device in at least one terminal device, N2 is the number of terminal devices whose index of the frequency domain resources occupied in the at least one time slot is less than the index of the frequency domain resources occupied by the first terminal device in the first time slot, and x is the index of the first time slot in at least one time slot. k, N2, and x are positive integers. The value range of x is 0 to the number of the at least one time slot. The value range of N2 is 0 to the number of the terminal devices.

In this implementation, the at least one terminal device is sorted in ascending order by the index of the time slot first, and then sorted by the index of the frequency domain resource occupied by the terminal device in the time slot. For example, as shown in FIG12B , assuming that the number of the at least one time slot is 2, the index of the first time slot is 1, the number of terminal devices corresponding to the first time slot is 2 (that is, the number of terminal devices transmitting data in the first time slot is 2), and the index of the frequency domain resource occupied by the first terminal device in the first time slot is 1. The number of terminal devices whose index of the frequency domain resource occupied in the at least one time slot is less than 1 is 2, that is, N2=2, x=1, then the index of the first terminal device in the at least one terminal device is 3.

It can be understood that when the index of the frequency domain resources occupied by the first terminal device in the first time slot is 0, N2 is 0.

In an embodiment of the present application, the at least one terminal device may be sorted in ascending order by first arranging the frequency domain resources occupied in the time slot, and then arranging them in ascending order by the index of the time slot. Alternatively, the at least one terminal device may be sorted in ascending order by first arranging the time slot index, and then arranging them in ascending order by the index of the frequency domain resources occupied in the time slot. Depending on the arrangement of the at least one terminal device, the index of the first terminal device in the at least one terminal device is different, and the position of the second resource corresponding to the first terminal device on the first resource is different.

Example three: The number of terminal devices is the maximum number of terminal devices supported by the first time slot, or the maximum number of terminal devices supported by at least one time slot.

Exemplarily, the maximum number of terminal devices supported by the first time slot is the maximum number of terminal devices that support sending data in the first time slot. The maximum number of terminal devices supported by at least one time slot is the maximum number of terminal devices that support sending data on the at least one time slot.

Exemplarily, the maximum number of terminal devices supported by the first time slot is related to the frequency domain resources included in the first time slot. The more frequency domain resources included in the first time slot, the more maximum number of terminal devices supported by the first time slot. The maximum number of terminal devices supported by the at least one time slot is determined by the frequency domain resources included in the at least one time slot and the number of at least one time slot. The more frequency domain resources included in the at least one time slot, the more maximum number of terminal devices supported by the at least one time slot. The more the number of the at least one time slot, the more maximum number of terminal devices supported by the at least one time slot.

In some possible implementations, when the first terminal device and the second terminal device are unable to determine the number of terminal devices corresponding to the first time slot or the number of terminal devices corresponding to at least one time slot, the first terminal device and the second terminal device may determine the second resource based on the maximum number of terminal devices supported by the first time slot or the maximum number of terminal devices supported by at least one time slot.

Implementation method three: the second resource is determined according to the first resource and the quantity of at least one time slot.

In this implementation, frequency-division multiplexing (FDM) is not supported between the first terminal device and the second terminal device, that is, only one terminal device corresponds to one time slot, and only one data is generated by one terminal device in one time slot. In this case, the first terminal device and the second terminal device can allocate the first resource according to the number of the at least one time slot, so as to determine the resource corresponding to each time slot in the at least one time slot.

Exemplarily, the first resource can be allocated to each time slot in the at least one time slot according to the number of at least one time slot. Exemplarily, the number of resources corresponding to each time slot in the at least one time slot is equal or the difference is not 0 or 1, that is, the first resource is evenly distributed to each time slot in the at least one time slot, so that each time slot can be allocated more resources, so that the data transmission in each time slot can be allocated to more feedback resources, so as to achieve reasonable allocation of resources and avoid waste of resources. That is, the number of resources contained in the second resource is the number of resources contained in the first resource divided by the number of the at least one time slot. That is, the number of frequency domain resources contained in the second resource satisfies:
N＝M/S

Among them, N is the number of frequency domain resources included in the second resource, M is the number of frequency domain resources included in the first resource, and S is the number of at least one time slot.

For example, as shown in FIG13, the at least one time slot includes time slot 1 and time slot 2, and the first resource includes a resource for transmitting PSFCH included in time slot 4. Assuming that the first resource includes 10 interlaces, the resources corresponding to time slot 1 may include 5 interlaces (indicated by the diagonal box in FIG10), and the resources corresponding to time slot 2 may include 5 interlaces (indicated by the gray box in FIG13).

Exemplarily, the position of the second resource on the first resource is determined by an index of the first time slot in at least one time slot.

The index of the frequency domain resource included in the second resource on the first resource satisfies:
i*N<j<(i+1)*N-1

Among them, j is the index corresponding to the frequency domain resources included in the second resource in the first resource, i is the index corresponding to the first time slot in at least one time slot, wherein 0≤i≤N, N is the number of frequency domain resources included in the second resource.

Exemplarily, after the first terminal device or the second terminal device determines the frequency domain resources included in the second resource, it can be determined that the total frequency domain code domain resources corresponding to the first data are: or in is the number of cyclic shift logarithms, _Nocc is the length of frequency domain orthogonal cover code (OCC). Optionally, the value of the frequency domain OCC length can be 1, 2, or 4. Optionally, the frequency domain OCC circulates between PRBs of an interlace.

The order of index sorting of the total frequency domain and code domain resources corresponding to the first data is: from the N interlaces, first sort in ascending order of the interlace index, and then sort according to Optionally, for frequency domain OCCs, they may be arranged in ascending order according to the length of the frequency domain OCCs.

Exemplarily, the HARQ information of the first data may be transmitted in one of the second resources. The first terminal device or the second terminal device may determine an index of a resource in the second resource for transmitting the HARQ information of the first data. Exemplarily, the first terminal device or the second terminal device may determine the index of the resource based on the following formula:
index3＝(P _ID +M _ID )modR

Wherein, P _ID is the physical layer source ID provided in the second-level SCI for scheduling PSSCH (carrying the first data), and R is the total frequency domain and code domain resources included in the second resources.

When the first data is multicast data and the feedback mode corresponding to the first data is ACK or NACK, that is, the broadcast type indicated in the second-level SCI is "01", M _ID is the identification information of the terminal device receiving PSSCH, and the identification information is indicated by the higher layer; in other cases, M _ID is 0.

In this implementation manner, the first resource may be allocated according to the number of at least one time slot, so that the first resource can be reasonably allocated to avoid waste of resources.

Please refer to Figure 14, which is an interactive schematic diagram of another communication method provided in an embodiment of the present application. As shown in Figure 14, the communication method includes but is not limited to the following steps.

1401. A first terminal device sends first data, and correspondingly, a second terminal device receives the first data, where the first data is multicast data.

Exemplarily, the feedback mode corresponding to the first data is to feed back only NACK information of the first data.

1402. The second terminal device sends the first information. Correspondingly, the first terminal device receives the first information, and the first information is used to occupy a channel.

When the second terminal device successfully decodes the first data, it sends the first information on the fourth resource, the first information is used to occupy the channel, and the fourth resource is included in the resources corresponding to the feedback opportunity.

The feedback opportunity may also be referred to as a PSFCH transmission opportunity, a PSFCH transmission position, a PSFCH transmission opportunity, a PSFCH symbol, or a PSFCH time slot. The resource corresponding to the feedback opportunity is the PSFCH resource included in the time slot including the PSFCH resource, that is, the resource included in the PSFCH symbol for transmitting the PSFCH.

Exemplarily, the first information may be ACK information or NACK information, or any other information, which is not limited in the present application. When the second terminal device successfully decodes the first data, it sends the first information on the fourth resource to occupy the channel, avoid interruption of the channel occupancy time, and ensure the continuity of the channel occupancy time. Exemplarily, the first information may be a PSFCH sequence. The initial value of the cyclic shift corresponding to the PSFCH sequence is a first value. The cyclic shift value corresponding to the PSFCH sequence is a second value. Exemplarily, the first value may be 0. The second value may be 0.

Exemplarily, the fourth resource may be an interlace in the PSFCH resource.

Exemplarily, the fourth resource is a public resource, and the fourth resource is used to transmit the first information sent by a terminal device that successfully decodes the first data, or the fourth resource is used to transmit the first information of a terminal device that detects the side control information SCI that schedules the first data. That is, within the communication group, the terminal devices that successfully decode the first data can send the first information on the fourth resource. Alternatively, the terminal devices that detect the SCI that schedules the first data can send the first information on the fourth resource. That is, the terminal device that sends the first information may not be the target terminal device of the multicast data. In an embodiment of the present application, the first information can be transmitted in a public resource to avoid COT interruption caused by the channel being occupied by other terminal devices.

Exemplarily, the fifth resource is a public resource, and the fifth resource is used to transmit the first information sent by the terminal device that successfully decodes the first data. In some possible implementations, the fourth resource is included in the second resource, and the position of the fourth resource on the second resource is determined by the source identifier and the offset. The second resource is a resource allocated to the first terminal device on the resource corresponding to the feedback opportunity.

Exemplarily, the index of the fourth resource on the second resource satisfies:
index2＝(ID+offset)mod M

Among them, index2 is the index of the fourth resource on the second resource, ID is the source identifier carried by the first data, offset is the offset, and M is the number of resources included in the second resource. Optionally, the offset can be 1, or it can be other values pre-configured or configured or preset by the network device. The number of resources included in the second resource can be the number of frequency domain resources included in the second resource, or it can be the number of frequency domain code domain resources included in the second resource.

Exemplarily, the number of resources included in the second resource may be the number of frequency domain resources included in the second resource. For example, the number of resources included in the second resource is the number of interlaces included in the second resource.

In another possible implementation manner, the position of the fourth resource in the resources corresponding to the feedback opportunity is preconfigured or configured by the network device.

Exemplarily, the second terminal device receives indication information from the network device, the indication information is carried in the RRC, and the indication information is used to indicate the PRB set included in the fourth resource. Optionally, the PRB set can be indicated by a bit string (bitmap). For example, a PSFCH symbol includes 52 PRBs, of which 10 PRBs are configured to transmit the first information, that is, 10 PRBs are the fourth resource. Among them, the indication of the bit string can correspond to the indication of the lowest position in the frequency domain from low to high. The number of indicated PRBs is the length of the bit string. Optionally, the indication information can also indicate the interlace included in the fourth resource. For example, a PSFCH symbol includes multiple interlaces, one of which is the fourth resource. The fourth resource can be indicated by X bits, where X is the number of interlaces included in the PSFCH symbol. Or the interlace with the smallest index or the interlace with the largest index included in the default PSFCH symbol is the fourth resource.

Exemplarily, the fourth resource may be a preconfigured PRB set, or the fourth resource may be a PRB set configured by the network device.

In this implementation, the position of the fourth resource in the resources corresponding to the feedback opportunity may be pre-configured or configured by the network device, so that the terminal device can quickly determine the position of the fourth resource in the resources corresponding to the feedback opportunity based on the configuration.

In another possible implementation, the fourth resource may be a dynamically indicated PRB set. That is, in this implementation, the position of the fourth resource in the resources corresponding to the feedback opportunity is dynamic.

In some possible implementations, the first terminal device may not receive the first information. It is understandable that the first information is used to occupy a channel, that is, the first information is useless information for the first terminal device, so the first terminal device may not receive the first information.

In a possible implementation, when at least one of the following second conditions is met, the second terminal device sends the first information on the fourth resource after successfully decoding the first data.

The second condition includes:

The data transmission in at least one PSSCH time slot associated with the time slot where the fourth resource is located includes multicast and unicast with feedback mode of ACK information or NACK information, and the corresponding second-level SCI indicates that HARQ is disabled; the at least one PSSCH time slot associated with the time slot where the fourth resource is located means that the HARQ information corresponding to the data transmission in the at least one PSSCH time slot is transmitted in the time slot where the fourth resource is located. Or,

The data transmission in at least one PSSCH time slot associated with the time slot where the fourth resource is located (the feedback opportunity) includes broadcasting. Or,

The data transmission in at least one PSSCH time slot associated with the time slot where the fourth resource is located includes a feedback mode of multicast in which only NACK (NACK only) is fed back.

In another possible implementation, when at least one of the third conditions is met, the second terminal device does not send the first information on the fourth resource after successfully decoding the first data.

The third condition includes:

There is multicast data transmission in at least one PSSCH time slot associated with the time slot where the fourth resource is located (the feedback opportunity), and the feedback mode of the multicast data is feedback ACK information or NACK information, and the corresponding second-level SCI indicates HARQ enablement; or,

At least one PSSCH time slot associated with the time slot where the fourth resource is located has unicast data transmission and the corresponding second-level SCI indicates HARQ enablement.

Exemplarily, the second terminal device may determine the HARQ enabling status according to the SCI in the PSSCH transmission timing associated with the feedback timing, thereby determining whether there is multicast data or unicast data with a feedback mode of feedback ACK information or NACK information that can be fed back on the resource corresponding to the feedback timing. For example, the second terminal device may determine the HARQ enabling status according to the feedback type (cast type) in the SCI.

In this implementation, when there is a feedback mode for multicast data or unicast data that feeds back ACK information or NACK information on the resources corresponding to the feedback opportunity, the resources corresponding to the feedback opportunity can be used, so it will not cause the channel occupancy time to be interrupted. In this case, the second terminal device does not need to send the first information on the fourth resource, which can save signaling overhead.

1403. The second terminal device sends NACK information, and correspondingly, the first terminal device receives NACK information.

The second terminal device sends a negative acknowledgement NACK information on the fifth resource when the first data is not successfully decoded, and the fifth resource is a resource in the second resource. The fifth resource is frequency-division multiplexed or code-division multiplexed with the fourth resource. The fifth resource is frequency-division multiplexed with the fourth resource, that is, the frequency domain resources of the fifth resource and the fourth resource are different, and the code domain resources are the same. The fifth resource is code-division multiplexed with the fourth resource, that is, the frequency domain resources of the fifth resource and the fourth resource are the same, and the code domain resources are different.

Exemplarily, the second resource is a resource allocated to the first terminal device on the first resource, and the fifth resource may be an interlace on the second resource. The interlace includes X PRBs. X is an integer, and X may be preconfigured or configured by a network device. Optionally, the subchannel includes one or more interlaces. Exemplarily, the index of the fifth resource on the second resource is determined by the source identifier of the first data. For example, the index of the fifth resource on the second resource satisfies:
index2＝ID1 mod M

Among them, index2 is the index of the fifth resource on the second resource, ID1 is the source identifier of the first data, and M is the number of resources included in the second resource. It can be understood that the number of resources included in the second resource can be the number of frequency domain resources included in the second resource, or the number of frequency domain code domain resources included in the second resource. In the embodiment of the present application, the position of the fourth resource on the second resource is determined by the source identifier and the offset, and the position of the fifth resource on the second resource is determined by the source identifier, so that the fourth resource can avoid conflict with the fifth resource.

Exemplarily, the fifth resource is a PRB. That is, the index of the fifth resource on the second resource satisfies:
index2＝ID1 mod M

Among them, index2 is the index of the fifth resource on the second resource, ID1 is the source identifier of the first data, and M is the number of resources contained in the second resource. Among them, the frequency domain of the fifth resource occupies 1 PRB, and the second resource is a set of PRBs. The second resource does not include the pre-configured or configured fourth resource. That is, the resources included in the PSFCH symbol include the fourth resource and the first resource, wherein the fourth resource is used to transmit the first information, and the first resource is used to transmit the HARQ information. Functionally, the first information is for the purpose of meeting the OCB requirements and/or occupying the channel.

Exemplarily, the fifth resource and the fourth resource are included in an interlace. The fourth resource occupies H PRBs in an interlace, and the fifth resource occupies one PRB in the interlace. Wherein H is a positive integer. H can be configured or preconfigured by the network device. Exemplarily, H+1 is equal to the number of PRBs included in the interlace.

The first terminal device detects NACK information on the fifth resource, and resends the first data when the NACK information is received. If the first terminal device does not detect the NACK information, it can be considered that the receiving end (such as the second terminal device) successfully decodes the first data, so the first terminal device does not need to resend the first data.

In an embodiment of the present application, the second terminal device sends information both in the case of successful decoding and unsuccessful decoding, thereby ensuring that the PSFCH resources are used, that is, the channel is occupied, avoiding interruption of the channel occupancy time, and ensuring the continuity of the channel occupancy time.

It can be understood that, according to the decoding state of the first data, the method shown in FIG14 may include one of step 1402 and step 1403. For example, in the case where the second terminal device successfully decodes the first data, the method shown in FIG14 includes step 1402. In the case where the second terminal device does not successfully decode the first data, the method shown in FIG14 includes step 1403.

Please refer to Figure 15, which is an interactive schematic diagram of another communication method provided in an embodiment of the present application. As shown in Figure 15, the method includes but is not limited to the following steps.

1501. A first terminal device determines at least one time slot and a first resource, wherein the at least one time slot is used to transmit data, and the first resource is used to transmit feedback information of the data transmitted in the at least one time slot.

1502. The second terminal device determines at least one time slot and a first resource.

It can be understood that the specific implementation of step 1501 and step 1502 can refer to the relevant description of step 1101 and step 1002 in Figure 10, which will not be described in detail here.

1503. The first terminal device sends the first data in the first time slot, and correspondingly, the second terminal device receives the first data in the first time slot.

1504. When the second terminal device successfully decodes the first data, the second terminal device sends the first information on the fourth resource. Correspondingly, the first terminal device receives the first information on the fourth resource. The fourth resource is included in the resource corresponding to the feedback opportunity. The resource corresponding to the feedback opportunity includes the above-mentioned first resource.

It can be understood that the specific description of the fourth resource and the first information can refer to the relevant description in Figure 14, and will not be described in detail here.

1505. When the second terminal device fails to decode the first data successfully, the second terminal device sends NACK information on the fifth resource, and correspondingly, the first terminal device receives the NACK information on the fifth resource. The fifth resource is a resource in the second resource, the second resource is included in the first resource, and the fifth resource is frequency-division multiplexed or code-division multiplexed with the fourth resource.

It can be understood that the specific description of the second resource, the first resource and the fifth resource can refer to the relevant description in the embodiment shown in Figure 10 or Figure 14, and will not be described one by one here.

In an embodiment of the present application, the feedback opportunity may be a PSFCH transmission opportunity, and the resource corresponding to the feedback opportunity is the PSFCH resource included in the time slot including the PSFCH resource. The first information may be a positive acknowledgement ACK information or NACK information, or any other information, which is not limited here. The first data is multicast data, and the terminal device decodes the first data after receiving the first data. In the case of successful decoding, the first information is sent on the fourth resource so that the channel can be occupied, thereby avoiding the interruption of the channel occupancy time due to the fact that the PSFCH resource is not used due to the successful decoding of the first data by the terminal devices in the multicast data transmission, thereby ensuring the continuity of the channel occupancy time.

The following is an introduction to the communication device provided in the embodiments of the present application.

The present application divides the functional modules of the communication device according to the above method embodiment. For example, each functional module can be divided according to each function, or two or more functions can be integrated into one processing module. The above integrated modules can be implemented in the form of hardware or in the form of software functional modules. It should be noted that the division of modules in the present application is schematic and is only a logical function division. There may be other division methods in actual implementation. The communication device of the embodiment of the present application will be described in detail below in conjunction with Figures 16 to 18.

FIG16 is a schematic diagram of the structure of a communication device provided in an embodiment of the present application. As shown in FIG16 , the communication device includes a processing unit 1601 , a sending unit 1602 , and a receiving unit 1603 .

In some embodiments of the present application, the communication device may be the first terminal device shown above. That is, the communication device shown in FIG16 may be used to execute the steps or functions performed by the first terminal device in the above method embodiment. Exemplarily, the communication device may be a beamforming transmission device or chip, etc., which is not limited in the embodiments of the present application.

The processing unit 1601 is configured to determine at least one time slot and a first resource;

The sending unit 1602 is configured to send first data;

The receiving unit 1603 is configured to receive feedback information of the first data.

Optionally, the processing unit 1601 is further configured to determine the third resource and determine the second resource.

It can be understood that the specific description of the at least one time slot, the first resource, the first data, the feedback information of the first data, the second resource and the third resource, etc. can refer to the method embodiments shown above, such as the relevant descriptions of the methods shown in Figures 10, 14, and 15, etc., and will not be described in detail here.

It can be understood that the specific description of the processing unit, sending unit and receiving unit shown in the embodiments of the present application is only an example. For the specific functions or execution steps of the processing unit, sending unit and receiving unit, etc., reference can be made to the above-mentioned method embodiments and will not be described in detail here.

Reusing Figure 16, in some other embodiments of the present application, the communication device may be the second terminal device shown above. That is, the communication device shown in Figure 16 may be used to execute the steps or functions performed by the second terminal device in the above method embodiment. Exemplarily, the communication device may be a beamforming receiving device or chip, etc., which is not limited in the embodiments of the present application.

The receiving unit 1603 is configured to receive first data;

The sending unit 1602 is configured to send feedback information of the first data.

Optionally, the sending unit 1602 is further used to send the first information on the fourth resource, or send NACK information on the fifth resource.

It can be understood that the specific description of the at least one time slot, the first resource, the second resource, the third resource, the fourth resource, the fifth resource, the first information, the NACK information, etc. can refer to the method embodiments shown above, such as the relevant descriptions of the methods shown in Figures 10, 14, and 15, etc., which will not be described in detail here.

It can be understood that the specific description of the receiving unit, the sending unit and the processing unit shown in the embodiments of the present application is only an example. For the specific functions or execution steps of the receiving unit, the sending unit and the processing unit, etc., reference can be made to the above-mentioned method embodiments and will not be described in detail here.

The first terminal device and the second terminal device of the embodiment of the present application are introduced above, and the possible product forms of the first terminal device and the second terminal device are introduced below. It should be understood that any product of any form having the functions of the first terminal device described in FIG. 16 above, or any product of any form having the functions of the second terminal device described in FIG. 16 above, falls within the protection scope of the embodiment of the present application. It should also be understood that the following introduction is only for example, and does not limit the product forms of the first terminal device and the second terminal device of the embodiment of the present application to this.

In the communication device shown in FIG16 , the processing unit 1601 may be one or more processors, the sending unit 1602 may be a transmitter, and the receiving unit 1603 may be a receiver, and the sending unit and the receiving unit are integrated into one device, such as a transceiver. Alternatively, the processing unit 1601 may be one or more processors (or the processing unit 1601 may be one or more logic circuits), the sending unit 1602 may be an output interface, and the receiving unit 1603 may be an input interface, and the input interface and the output interface may be integrated into one unit, such as an input-output interface. This will be described in detail below.

In a possible implementation, in the communication device shown in FIG16, the processing unit 1601 may be one or more processors, and the sending unit 1602 and the receiving unit 1603 are integrated into one device, such as a transceiver. In the embodiment of the present application, the processor and the transceiver may be coupled, etc., and the embodiment of the present application does not limit the connection method between the processor and the transceiver.

As shown in FIG. 17 , the communication device 170 includes one or more processors 1720 and a transceiver 1710 .

Exemplarily, when the communication device is used to execute the steps, methods or functions executed by the first terminal device, the processor 1720 is used to determine at least one time slot and a first resource; the transceiver 1710 is used to send the first data and receive feedback information of the first data. Optionally, the processor 1720 is also used to determine the third resource and determine the second resource.

Exemplarily, when the communication device is used to execute the steps, methods or functions executed by the second terminal device, the processor 1720 is used to determine at least one time slot and a first resource; the transceiver 1710 is used to receive the first data and send feedback information of the first data. Optionally, the processor 1720 is also used to determine the third resource and the second resource. Optionally, the transceiver 1710 is also used to send the first information or NACK information.

It can be understood that for the specific description of the processor and the transceiver, reference can also be made to the introduction of the processing unit, the sending unit and the receiving unit shown in FIG16 , which will not be repeated here.

In various implementations of the communication device shown in FIG17 , the transceiver may include a receiver and a transmitter, wherein the receiver is used to perform a receiving function (or operation) and the transmitter is used to perform a transmitting function (or operation). The transceiver is used to communicate with other devices/devices via a transmission medium.

Optionally, the communication device 170 may also include one or more memories 1730 for storing program instructions and/or data. The memory 1730 is coupled to the processor 1720. The coupling in the embodiment of the present application is an indirect coupling or communication connection between devices, units or modules, which may be electrical, mechanical or other forms, and is used for information exchange between devices, units or modules. The processor 1720 may operate in conjunction with the memory 1730. The processor 1720 may execute program instructions stored in the memory 1730. Optionally, at least one of the one or more memories may be included in the processor.

In the embodiment of the present application, the specific connection medium between the transceiver 1710, the processor 1720 and the memory 1730 is not limited. In FIG. 17 , the memory 1730, the processor 1720 and the transceiver 1710 are connected via a bus 1740, which is indicated by a thick line in FIG. The connection modes between other components are only schematically illustrated and are not intended to be limiting. The bus can be divided into an address bus, a data bus, a control bus, etc. For ease of representation, only one thick line is used in FIG17, but it does not mean that there is only one bus or one type of bus.

In the embodiments of the present application, the processor may be a general-purpose processor, a digital signal processor, an application-specific integrated circuit, a field programmable gate array or other programmable logic device, a discrete gate or transistor logic device, a discrete hardware component, etc., and may implement or execute the methods, steps, and logic block diagrams disclosed in the embodiments of the present application. The general-purpose processor may be a microprocessor or any conventional processor, etc. The steps of the method disclosed in the embodiments of the present application may be directly embodied as being executed by a hardware processor, or may be executed by a combination of hardware and software modules in the processor, etc.

In the embodiments of the present application, the memory may include, but is not limited to, non-volatile memories such as hard disk drive (HDD) or solid-state drive (SSD), random access memory (RAM), erasable programmable read-only memory (EPROM), read-only memory (ROM) or portable read-only memory (CD-ROM), etc. The memory is any storage medium that can be used to carry or store program codes in the form of instructions or data structures and can be read and/or written by a computer (such as the communication device shown in the present application), but is not limited to this. The memory in the embodiments of the present application can also be a circuit or any other device that can realize a storage function, which is used to store program instructions and/or data.

The processor 1720 is mainly used to process the communication protocol and communication data, and to control the entire communication device, execute the software program, and process the data of the software program. The memory 1730 is mainly used to store the software program and data. The transceiver 1710 may include a control circuit and an antenna. The control circuit is mainly used to convert the baseband signal and the radio frequency signal and process the radio frequency signal. The antenna is mainly used to send and receive radio frequency signals in the form of electromagnetic waves. The input and output devices, such as a touch screen, a display screen, a keyboard, etc., are mainly used to receive data input by the user and output data to the user.

When the communication device is turned on, the processor 1720 can read the software program in the memory 1730, interpret and execute the instructions of the software program, and process the data of the software program. When data needs to be sent wirelessly, the processor 1720 performs baseband processing on the data to be sent, and outputs the baseband signal to the RF circuit. The RF circuit performs RF processing on the baseband signal and then sends the RF signal outward in the form of electromagnetic waves through the antenna. When data is sent to the communication device, the RF circuit receives the RF signal through the antenna, converts the RF signal into a baseband signal, and outputs the baseband signal to the processor 1720. The processor 1720 converts the baseband signal into data and processes the data.

In another implementation, the RF circuit and antenna may be arranged independently of the processor performing baseband processing. For example, in a distributed scenario, the RF circuit and antenna may be arranged independently of the communication device in a remote manner.

It is understandable that the communication device shown in the embodiment of the present application may also have more components than those in FIG. 17, and the embodiment of the present application does not limit this. The method performed by the processor and transceiver shown above is only an example, and the specific steps performed by the processor and transceiver can refer to the method described above.

In another possible implementation, in the communication device shown in FIG16 , the processing unit 1601 may be one or more logic circuits, the sending unit 1602 may be an output interface, and the receiving unit 1603 may be an input interface, and the input interface and the output interface may be integrated into one unit, such as an input-output interface. The input-output interface may also be called a communication interface, or an interface circuit, or an interface, etc. As shown in FIG18 , the communication device shown in FIG18 includes a logic circuit 1801 and an interface 1802. That is, the above-mentioned processing unit 1601 may be implemented with a logic circuit 1801, and the sending unit 1602 and the receiving unit 1603 may be implemented with an interface 1802. Among them, the logic circuit 1801 may be a chip, a processing circuit, an integrated circuit or a system on chip (SoC) chip, etc., and the interface 1802 may be a communication interface, an input-output interface, a pin, etc. Exemplarily, FIG18 is exemplified by taking the above-mentioned communication device as a chip, and the chip includes a logic circuit 1801 and an interface 1802.

In the embodiment of the present application, the logic circuit and the interface may also be coupled to each other. The embodiment of the present application does not limit the specific connection method between the logic circuit and the interface.

Exemplarily, when the communication device is used to execute the method, function or step executed by the first terminal device, the logic circuit 1801 is used to determine at least one time slot and a first resource; the interface 1802 is used to output the first data and the feedback information of the input first data. Optionally, the processor 1720 is also used to determine the third resource and the second resource.

Exemplarily, when the communication device is used to execute the method, function or step executed by the second terminal device, the logic circuit 1801 is used to determine at least one time slot and a first resource; the interface 1802 is used to input the first data and output feedback information of the first data. Optionally, the logic circuit 1801 is also used to determine the third resource and the second resource. Optionally, the interface 1802 is also used to output the first information or NACK information.

It can be understood that the specific description of the at least one time slot, the first resource, the second resource, the third resource, the fourth resource, the fifth resource, the first information, the NACK information, etc. can refer to the method embodiments shown above, such as the relevant description of the method shown in Figures 10, 14, and 15. etc., which will not be elaborated here.

For the specific implementation methods of the various embodiments shown in Figure 18, you can also refer to the above embodiments, which will not be described in detail here.

The present application also provides a communication system, which includes: a first terminal device and a second terminal device. The first terminal device and the second terminal device can be used to execute the method in any of the above embodiments (such as FIG. 10, FIG. 14, FIG. 15, etc.).

In addition, the present application also provides a computer program, which is used to implement the operations and/or processing performed by the first terminal device in the method provided by the present application.

The present application also provides a computer program, which is used to implement the operations and/or processing performed by the second terminal device in the method provided by the present application.

The present application also provides a computer-readable storage medium, in which computer code is stored. When the computer code is executed on a computer, the computer executes the operations and/or processing performed by the first terminal device in the method provided in the present application.

The present application also provides a computer-readable storage medium, in which computer code is stored. When the computer code is executed on a computer, the computer executes the operation and/or processing performed by the second terminal device in the method provided in the present application.

The present application also provides a computer program product, which includes a computer code or a computer program. When the computer code or the computer program runs on a computer, the operations and/or processing performed by the first terminal device in the method provided by the present application are executed.

The present application also provides a computer program product, which includes a computer code or a computer program. When the computer code or the computer program runs on a computer, the operations and/or processing performed by the second terminal device in the method provided by the present application are executed.

An embodiment of the present application also provides a chip or a chip system, including: a processor, used to execute the method in any of the aforementioned embodiments (such as Figure 10, Figure 14, Figure 15, etc.).

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

The units described as separate components may or may not be physically separated, and the components displayed as units may or may not be physical units, that is, they may be located in one place or distributed on multiple network units. Some or all of the units may be selected according to actual needs to achieve the technical effects of the solutions provided in the embodiments of the present application.

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 computer-readable storage medium. Based on this understanding, the technical solution 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, and the computer software product is stored in a readable storage medium, including a number of instructions to enable a computer device (which can be a personal computer, server, or network device, etc.) to perform all or part of the steps of the method described in each embodiment of the present application. The aforementioned readable 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 is only a specific implementation of the present application, but the protection scope of the present application is not limited thereto. Any person skilled in the art who is familiar with the present technical field can easily think of changes or substitutions within the technical scope disclosed in the present application, which should be included in the protection scope of the present application. Therefore, the protection scope of the present application should be based on the protection scope of the claims.

Claims

A communication method, comprising:

Determine at least one time slot and a first resource, the at least one time slot is used to transmit data, and the first resource is used to transmit feedback information of the data transmitted in the at least one time slot;

Sending first data on a first time slot, the first time slot being included in the at least one time slot;

Feedback information of the first data is received on a second resource, where the second resource is included in the first resource.
A communication method, comprising:

Determine at least one time slot and a first resource, the at least one time slot is used to transmit data, and the first resource is used to transmit feedback information of the data transmitted in the at least one time slot;

receiving first data on a first time slot, the first time slot being included in the at least one time slot;

Feedback information of the first data is sent on a second resource, where the second resource is included in the first resource.
The method according to claim 1 or 2 is characterized in that the second resource is determined based on the first resource, the number of the at least one time slot and the number of terminal devices, and the number of terminal devices is the number of terminal devices corresponding to the at least one time slot or the number of terminal devices corresponding to the first time slot.
The method according to claim 3, characterized in that the number of terminal devices is the number of terminal devices corresponding to the first time slot, and the method further comprises:

Determine, from the first resources, a third resource corresponding to the first time slot according to the number of the at least one time slot;

The second resource is determined from the third resource according to the number of terminal devices.
The method according to claim 4 is characterized in that the first resource includes frequency domain resources, the third resource includes frequency domain resources, and the second resource includes frequency domain resources or frequency domain code domain resources.
The method according to claim 4 is characterized in that the first resource includes frequency domain and code domain resources, the third resource includes frequency domain and code domain resources, and the second resource includes frequency domain and code domain resources.
The method according to claim 6 is characterized in that the frequency domain and code domain resources are sorted in ascending order by firstly indices in the frequency domain and then in ascending order by indices in the code domain; or, the sorting method is firstly in ascending order by indices in the code domain and then in ascending order by indices in the frequency domain.
The method according to claim 3, characterized in that the number of terminal devices is the number of terminal devices corresponding to the at least one time slot, and the position of the second resource in the first resource is determined by the index of the first terminal device sending the first data in the at least one terminal device corresponding to the at least one time slot;

The index of the first terminal device in the at least one terminal device satisfies: k=N1+y, wherein k is the index of the first terminal device in the at least one terminal device, N1 is the number of terminal devices corresponding to the time slots whose index in the at least one time slot is less than the index of the first time slot, y is the index of the frequency domain resource occupied by the first terminal device in the first time slot, and k, N1 and y are positive integers; or,

The index of the first terminal device in the at least one terminal device satisfies: k=N2+x, wherein k is the index of the first terminal device in the at least one terminal device, N2 is the number of terminal devices whose index of the frequency domain resources occupied in the at least one time slot is less than the index of the frequency domain resources occupied by the first terminal device in the first time slot, x is the index of the first time slot in the at least one time slot, and k, N2 and x are positive integers.
The method according to any one of claims 3-8 is characterized in that at least one of the at least one time slot, the number of terminal devices and the first resource is indicated by first indication information, and the first indication information is used to indicate the starting position and length of the occupied channel resources, and the number of terminal devices sharing the channel resources.
The method according to any one of claims 4-7 is characterized in that the number of terminal devices is the maximum number of terminal devices supported by the first time slot, or the maximum number of terminal devices supported by the at least one time slot.
The method according to any one of claims 3-10 is characterized in that the number of the at least one time slot is determined by the period of a physical sidelink feedback channel PSFCH resource, and the PSFCH resource is a periodically configured resource for transmitting feedback information.
The method according to claim 1 or 2 is characterized in that the second resource is determined according to the first resource and the number of the at least one time slot.
The method according to claim 12 is characterized in that the number of frequency domain resources contained in the second resource satisfies: N=M/S, wherein N is the number of frequency domain resources contained in the second resource, M is the number of frequency domain resources contained in the first resource, and S is the number of the at least one time slot.
The method according to claim 12 or 13 is characterized in that the position of the second resource on the first resource is determined by the index of the first time slot in the at least one time slot.
The method according to claim 14 is characterized in that the index of the frequency domain resources included in the second resource on the first resource satisfies: i*N<j<(i+1)*N-1, wherein j is the index corresponding to the frequency domain resources included in the second resource in the first resource, i is the index corresponding to the first time slot in the at least one time slot, N is the number of frequency domain resources included in the second resource, and i, j and N are positive integers.
The method according to any one of claims 2 to 15, wherein the first data is multicast data, and the sending feedback information of the first data on the second resource comprises:

In case that the first data is successfully decoded, first information is sent on a fourth resource, where the first information is used to occupy a channel, and the fourth resource is included in resources corresponding to a feedback opportunity, and the resources corresponding to the feedback opportunity include the first resource;

In case the first data is not decoded successfully, negative acknowledgement NACK information is sent on a fifth resource, where the fifth resource is a resource in the second resource, and the fifth resource is frequency division multiplexed or code division multiplexed with the fourth resource.
The method according to claim 16 is characterized in that the fourth resource is a public resource, and the fourth resource is used to transmit the first information sent by a terminal device that successfully decodes the first data, or the fourth resource is used to transmit the first information sent by a terminal device that detects side control information SCI that schedules the first data.
The method according to claim 16 or 17 is characterized in that the fourth resource is included in the second resource, and the position of the fourth resource on the second resource is determined by a source identifier and an offset.
The method according to claim 18 is characterized in that the index of the fourth resource on the second resource satisfies: index2 = (ID + offset) mod M, wherein index2 is the index of the fourth resource, the ID is the source identifier, the offset is the offset, and M is the number of resources included in the second resource.
The method according to claim 16 or 17 is characterized in that the position of the fourth resource in the resources corresponding to the feedback opportunity is pre-configured or configured by the network device.
The method according to any one of claims 16 to 20, characterized in that sending the first information on the fourth resource comprises:

sending the first information on the fourth resource when the first condition is met;

The first condition includes: the data transmitted in the at least one time slot does not include multicast data and/or unicast data with feedback in the form of ACK information or NACK information, and the second-level SCI corresponding to the first data indicates that hybrid automatic repeat request HARQ is enabled.
A communication device, comprising:

a processing unit, configured to determine at least one time slot and a first resource, wherein the at least one time slot is used to transmit data, and the first resource is used to transmit feedback information of the data transmitted in the at least one time slot;

a sending unit, configured to send first data in a first time slot, wherein the first time slot is included in the at least one time slot;

A receiving unit is used to receive feedback information of the first data on a second resource, where the second resource is included in the first resource.
A communication device, comprising:

a processing unit, configured to determine at least one time slot and a first resource, wherein the at least one time slot is used to transmit data, and the first resource is used to transmit feedback information of the data transmitted in the at least one time slot;

a receiving unit, configured to receive first data in a first time slot, wherein the first time slot is included in the at least one time slot;

A sending unit is used to send feedback information of the first data on a second resource, and the second resource is included in the first resource.
A communication device, comprising a processor and a memory;

The memory is used to store instructions;

The processor is configured to execute the instructions so that the method according to any one of claims 1 to 21 is performed.
A communication device, characterized in that it comprises a logic circuit and an interface, wherein the logic circuit and the interface are coupled;

The interface is used to input and/or output code instructions, and the logic circuit is used to execute the code instructions so that the method described in any one of claims 1 to 21 is executed.
A computer-readable storage medium, characterized in that the computer-readable storage medium is used to store a computer program, and when the computer program is executed, the method described in any one of claims 1 to 21 is executed.
A communication system, characterized in that it includes: a first communication device and a second communication device, the first communication device is used to execute the method as described in any one of claims 1 or 3-15, and the second communication device is used to execute the method as described in any one of claims 2-21.