CN117676887A

CN117676887A - Side-link communication method and communication device

Info

Publication number: CN117676887A
Application number: CN202210970551.5A
Authority: CN
Inventors: 黄海宁; 杨帆; 张天虹
Original assignee: Huawei Technologies Co Ltd
Current assignee: Huawei Technologies Co Ltd
Priority date: 2022-08-12
Filing date: 2022-08-12
Publication date: 2024-03-08
Also published as: WO2024032444A1

Abstract

The embodiment of the application provides a side uplink communication method and a communication device. The communication method comprises the following steps: the method comprises the steps that first terminal equipment obtains channel access time COT, wherein the COT comprises a first time slot, and the first time slot comprises PSFCH symbols; the first terminal equipment transmits target information on a first resource, wherein the first resource is a resource in a PSFCH symbol, the target information comprises one of first data, second data, first feedback information and second feedback information, the first data is data to be transmitted by the first terminal equipment on a first time slot, the second data is data to be received by the first terminal equipment on the first time slot, the first feedback information is feedback information to be transmitted by the first terminal equipment, and the second feedback information is feedback information to be received by the first terminal equipment. By the communication method and the communication device, the resource utilization rate on the uplink of the unlicensed spectrum can be improved, and the possibility of COT interruption can be further reduced.

Description

Side-link communication method and communication device

Technical Field

The embodiments of the present application relate to the field of communications, and more particularly, to a side-uplink communication method and a communication apparatus.

Background

In the NR-V side uplink system, the terminal equipment can communicate with other terminal equipment in a resource pool, PSFCH feedback resources are periodically configured in the resource pool, and PSSCH resources for transmitting data and the periodically configured PSFCH feedback resources have a corresponding mapping relation.

In unlicensed spectrum, terminal devices contend for a channel by listen-before-talk (LBT) to obtain a channel occupancy time (channel occupancy time, COT) and communicate with other terminal devices based on resources within the COT.

If PSFCH resources in COT are not used, waste may occur, and even COT interruption of the original terminal device may be caused.

Disclosure of Invention

The embodiment of the application provides a side-link communication method and a communication device, which can improve the utilization rate of resources included in PSFCH symbols in unlicensed spectrum and further reduce the possibility of COT interruption of terminal equipment.

In a first aspect, a method of side-link communication is provided, comprising: the method comprises the steps that a first terminal device obtains channel access time COT, wherein the COT comprises a first time slot, and the first time slot comprises PSFCH symbols; the first terminal equipment transmits target information on a first resource, wherein the first resource is a resource in the PSFCH symbol, the target information comprises one of first data, second data, first feedback information and second feedback information, the first data is data to be sent by the first terminal equipment on the first time slot, the second data is data to be received by the first terminal equipment on the first time slot, the first feedback information is feedback information to be sent by the first terminal equipment, and the second feedback information is feedback information to be received by the first terminal equipment.

The PSFCH symbol may be understood or replaced herein by a PSFCH time domain resource, a PSFCH candidate resource, a PSFCH transmission opportunity. It is understood that the PSFCH symbols may also transmit other channels or signals than PSFCH.

In this embodiment, the first terminal device acquires the COT, where the COT includes a first slot, where the first slot includes a PSFCH symbol, and the first terminal device transmits the target information using the first resource, thereby reducing waste of resources included in the PSFCH symbol. Further, the first resource is a partial resource or an entire resource among available resources included in the PSFCH symbol. At this point some or all of the resources included in the PSFCH symbol are available. When the resources included in the PSFCH symbol are fully available, i.e., the resources included in the PSFCH symbol are not used at all, the first terminal device uses the first resources, so that other terminal devices can not work on LBT (perform a channel access procedure) on the resources included in the PSFCH symbol, and the possibility of the first terminal device COT interruption is reduced. When the resources in the PSFCH symbol are partially used, the first resource may be a resource of the remaining resources that are not used. At this time, the utilization rate of resources in the PSFCH symbol is improved, and resource waste is avoided. In addition, when the first resource is utilized to transmit data, the data transmission efficiency can be improved (the transmission reliability can be improved due to the fact that the used resources have more code rate reduction); when the feedback information is transmitted by using the first resource, the reliability of the data transmission of the first terminal device can be improved.

It should be appreciated that in the embodiments of the present application, the resources included in the PSFCH symbol are all the resources of the PSFCH symbol within the COT. I.e. the resources comprised in the PSFCH symbol coincide with the PSFCH symbol in the time domain and with the frequency domain resources in the COT of the first terminal device in the frequency domain. That is, the time domain resources of the resources included in the PSFCH symbol are PSFCH symbols, and the frequency domain resources are frequency domain resources corresponding to the COT. The first resource is a resource in the PSFCH symbol, which means that the first resource is consistent with the PSFCH symbol in the time domain, and may belong to a frequency domain resource in the first terminal device COT in the frequency domain. I.e. the time domain resources of the first resource are PSFCH symbols and the frequency domain resources are the complete set or subset of the frequency domain resources corresponding to the COT.

With reference to the first aspect, in certain implementation manners of the first aspect, the target information includes first data or second data, where the transmitting, by the first terminal device, the target information on a first resource includes: the first terminal equipment sends the first data on a second resource, wherein the second resource comprises the first resource; or, the first terminal device receives the second data on the second resource, wherein the second resource comprises the first resource.

The relationship between the first resource and the second resource is: the first resource is a resource in the PSFCH symbol, and is included in the second resource, which is a resource used for PSSCH transmission.

With reference to the first aspect, in certain implementations of the first aspect, resources included in the PSFCH symbol are available.

Here, the time domain of the resources included in the PSFCH symbol is the PSFCH symbol, and the frequency domain is the frequency domain included in the COT. Since the unit of channel access is one channel, the frequency domain resource included in the PSFCH symbol is a frequency domain resource of one channel, which can be also understood as one RB set or 20M.

In this embodiment, the availability of the resources included in the PSFCH symbol means that the resources included in the PSFCH symbol are not used to transmit third feedback information (the third feedback information is HARQ information fed back on the PSFCH resource location associated according to the location of the PSSCH resource), then the first terminal device may transmit data using the first resource or transmit feedback information that has been unsuccessfully transmitted, which may be caused by a previous LBT failure or due to no PSFCH feedback resource in the COT, or due to failure of the feedback timing (interval of at least K) between PSSCH and PSFCH in the COT. Here, the feedback information that has been unsuccessfully transmitted may include one or more third feedback information.

With reference to the first aspect, in certain implementations of the first aspect, the resource portion included in the PSFCH symbol is available, and the target information includes one of the first feedback information and the second feedback information.

In this embodiment, if the resource portion included in the PSFCH symbol is available, the first terminal device may transmit the first feedback information or the second feedback information by using a first resource of the available resources, so as to improve the utilization rate of the resources.

The resources used for transmitting the third feedback information in the PSFCH symbol are used resources. The resources included in the PSFCH symbol are available resources after excluding the used resources. The first resource is a resource of the available resources. When the first terminal device transmits the third feedback information in the PSFCH symbol, the first terminal device transmits the first feedback information on the first resource. When the first terminal device receives the third feedback information in the PSFCH symbol, the first terminal device receives the first feedback information at the first resource.

With reference to the first aspect, in certain implementations of the first aspect, the second resource further includes at least one of: the resources corresponding to the AGC symbols in the first time slot, the resources corresponding to the GAP time units in the first time slot and the resources corresponding to the CPE time units in the first time slot.

In this embodiment, when the first terminal device uses the first resource to transmit the first data or the second data, the first terminal device may also use the resource corresponding to the AGC symbol, the resource corresponding to the GAP time unit, and the resource corresponding to the CPE time unit to transmit the first data or the second data, so as to increase the resource for data transmission, reduce the code rate, and improve the reliability of data transmission.

With reference to the first aspect, in certain implementation manners of the first aspect, when the first resource is used to send the first feedback information and the first terminal device sends data in the first time slot, the resource used by the first terminal device to send the first data includes a resource corresponding to a GAP time unit in the first time slot; or when the first resource is used for receiving the second feedback information and the first terminal device receives data in the first time slot, the first terminal device is used for receiving the second data and comprises resources corresponding to the GAP time unit in the first time slot.

In this embodiment, when the first resource is used to send the first feedback information and the first terminal device sends data in the first timeslot, the first timeslot is used by the first terminal device to send information, the GAP time unit is a time unit for transmitting/receiving conversion, and when the GAP time unit is used for sending or receiving before and after the GAP time unit, the first terminal device does not need transmitting/receiving conversion, and the GAP time unit can also be used for the first terminal device to transmit data, thereby increasing the number of resources, reducing the code rate, and improving the reliability of data transmission.

With reference to the first aspect, in certain implementation manners of the first aspect, the first terminal device transmits target information on the first resource according to at least one item of first information, where the first information includes: a priority of the first data; a priority of the second data; the priority of the first feedback information; and the priority of the second feedback information.

In this embodiment, the first terminal device determines which information to use for specifically transmitting the first resource according to at least one of the priority of the first data, the priority of the second data, the priority of the first feedback information, and the priority of the second feedback information. For example, the first terminal device prepares to transmit data in the first time slot, and the first terminal device has first feedback information that is not successfully transmitted and second feedback information that is not successfully received, the first terminal device may determine, according to the priority of the first data, the priority of the first feedback information and the priority of the second feedback information, to use the first resource for transmitting the item with the higher priority.

With reference to the first aspect, in certain implementation manners of the first aspect, the first terminal device transmits target information on the first resource according to at least one item of first information, where the first information includes: delay information of the first data; delay information of the second data; delay information of the first feedback information; and delay information of the second feedback information.

The delay information may be understood as delay requirement information, or packet delay budget PDB.

In this embodiment, the first terminal device transmits the shorter one of the delay times according to at least one of the delay information of the first data, the delay information of the second data, the delay information of the first feedback information, and the delay information of the second feedback information. The information with tight delay requirement is preferentially transmitted, so that the problem that the delay requirement cannot be met due to transmission delay of corresponding information can be avoided.

Optionally, the first terminal device may comprehensively compare the priority and the delay information described above, and determine what information the first resource is used to transmit.

With reference to the first aspect, in certain implementation manners of the first aspect, before the first terminal device transmits the target information on the first resource, the method further includes: the first terminal device determines that the first resource is available according to second information, wherein the second information comprises at least one of the following: the method comprises the steps of determining whether a first terminal device is a target terminal device of third data or not according to a transmission type of the third data, the HARQ feedback type of the third data, an energy measurement value associated with the third data and the first terminal device, wherein the third data is data transmitted on a second time slot, and the second time slot is at least one time slot determined according to the feedback timing and the first time slot.

The third data is SCI scheduled data detected by the first terminal device in the second set of time slots or SCI scheduled data transmitted by the first terminal device in the second set of time slots. The transmission type of the third data may be indicated in the second stage SCI, which schedules the third data. The HARQ feedback enable may be indicated in the second stage SCI scheduling the third data.

The first terminal device being the target terminal device of the third data may be understood as that the first terminal device is combined with a receiving terminal device for receiving the third data, or the first terminal device is a receiving terminal device of the third data, or the first terminal device determines to receive the third data from the target terminal device according to the source identification information (optional) and the destination identification information of the target terminal device (the source identification information (optional) and the destination identification information of the target terminal device are matched with the source identification information (optional) and the destination identification information stored in the first terminal device). Optionally, the source identification information (optional) and destination identification information are carried on the second level SCI and/or MAC header. The source identification information may be a source ID in the second level SCI. The destination identification information may be a destination ID in the second level SCI.

In this embodiment, before using the first resource to transmit the target information, the first terminal device further determines that the first resource is available according to the second information, so as to reuse the first resource to transmit the target information.

With reference to the first aspect, in some implementations of the first aspect, the determining, by the first terminal device, that the first resource is available according to the second information includes: when the second information meets a preset condition, the first terminal device determines that the first resource is available, and the preset condition comprises at least one of the following: the transmission type of the third data is broadcast; the transmission type of the third data is unicast or multicast and HARQ feedback is disabled; the energy measurement value associated with the third data is smaller than or equal to a preset threshold value; the first terminal device is not a target terminal device for the third data.

In this embodiment, when the first terminal device determines that the data transmitted in the time slot associated with the PSFCH symbol of the first time slot does not need to be fed back, the feedback resource corresponding to the data is an available resource. In addition, if the target terminal device of the data transmitted in the associated timeslot is not the first terminal device, the first terminal device may not allow the feedback information of the data to use the feedback resource in the first terminal device COT, so that the first terminal device may determine, according to the above condition, that some or all of the resources included in the PSFCH symbol are available resources, and determine the first resource from the available resources for transmitting the target information.

With reference to the first aspect, in certain implementation manners of the first aspect, before the first terminal device transmits the target information on the first resource, the method further includes: the first terminal equipment sends first indication information to second terminal equipment, wherein the first indication information is used for indicating the second terminal equipment to send the second data to the first terminal equipment on the second resource; or the first terminal equipment sends second indication information to second terminal equipment, wherein the second indication information is used for indicating the second terminal equipment to send the second feedback information to the first terminal equipment on the first resource or the second indication information is used for indicating the first terminal equipment to send the first feedback information.

In this embodiment, after the first terminal device determines that the first resource is available, the indication information may be sent to the second terminal device, to instruct the second terminal device to send the second data or the second feedback information to the first terminal device using the first resource.

In a second aspect, there is provided a side-link communication method, comprising: the method comprises the steps that a second terminal device receives COT indication information from a first terminal device, wherein a time unit indicated by the COT indication information comprises a first time slot, and the first time slot comprises a PSFCH symbol; the second terminal equipment transmits target information on a first resource, wherein the first resource is a resource in the PSFCH symbol, the target information comprises one of first data, second data, first feedback information and second feedback information, the first data is data to be received by the second terminal equipment on the first time slot, the second data is data to be sent by the second terminal equipment on the first time slot, the first feedback information is feedback information to be received by the second terminal equipment, and the second feedback information is feedback information to be sent by the second terminal equipment.

In this embodiment, the second terminal device receives the COT indication information of the first terminal device, and the second terminal device shares a first time slot within the first terminal device COT, where the first time slot includes a PSFCH symbol, and may transmit the target information using a first resource among the resources included in the PSFCH symbol. The second terminal device can reduce resource waste by using the first resource, and further, the first resource is part of or all of available resources included in the PSFCH symbol. When the resources included in the PSFCH symbol are not used at all, the second terminal device transmitting the target information on the first resource may avoid that the LBT of the other terminal devices at the PSFCH symbol is successful, so that the COT is interrupted. When the resources in the PSFCH symbol are partially used, the first resource may be a resource of the remaining resources that are not used. At this time, the efficiency of resource utilization in PSFCH symbols is improved, and resource waste is avoided. In addition, when the first resource is utilized to transmit data, the data transmission efficiency can be improved (the transmission reliability can be improved due to the fact that the used resources have more code rate reduction); when the feedback information is transmitted by using the first resource, the reliability of the data transmission of the second terminal device can be improved.

With reference to the second aspect, in certain implementations of the second aspect, the target information includes first data or second data, where the second terminal device transmits the target information on a first resource, including: the second terminal device receives the first data on a second resource, wherein the second resource comprises the first resource; or the second terminal equipment sends the second data on the second resource, wherein the second resource comprises the first resource.

With reference to the second aspect, in certain implementations of the second aspect, resources included in the PSFCH symbol are available.

With reference to the second aspect, in certain implementations of the second aspect, the second resource further includes at least one of: the resources corresponding to the AGC symbols in the first time slot, the resources corresponding to the GAP time units in the first time slot and the resources corresponding to the CPE time units in the first time slot.

With reference to the second aspect, in some implementations of the second aspect, when the first resource is used to receive the first feedback information and the second terminal device receives data in the first time slot, the resource used by the second terminal device to receive the first data includes a resource corresponding to a GAP time unit in the first time slot; or when the first resource is used for sending the second feedback information and the second terminal device sends data in the first time slot, the second terminal device is used for sending the second data to include resources corresponding to the GAP time unit in the first time slot.

With reference to the second aspect, in certain implementation manners of the second aspect, the second terminal device transmits target information on the first resource according to at least one item of first information, where the first information includes: a priority of the first data; a priority of the second data; the priority of the first feedback information; and the priority of the second feedback information.

With reference to the second aspect, in certain implementation manners of the second aspect, the second terminal device transmits target information on the first resource according to at least one item of first information, where the first information includes: delay information of the first data; delay information of the second data; delay information of the first feedback information; and delay information of the second feedback information.

With reference to the second aspect, in certain implementations of the second aspect, before the second terminal device transmits the target information on the first resource, the method further includes: the second terminal device determines that the first resource is available according to second information, wherein the second information comprises at least one of the following: the method comprises the steps of determining whether a first terminal device is a target terminal device of third data or not according to a transmission type of the third data, the HARQ feedback type of the third data, an energy measurement value associated with the third data and the first terminal device, wherein the third data is data transmitted on a second time slot, and the second time slot is at least one time slot determined according to the feedback timing and the first time slot.

The third data is SCI scheduled data detected by the second terminal device in the second set of time slots or SCI scheduled data transmitted by the second terminal device in the second set of time slots. The transmission type of the third data may be indicated in the second stage SCI, which schedules the third data. The HARQ feedback enable may be indicated in the second stage SCI scheduling the third data.

With reference to the second aspect, in some implementations of the second aspect, the determining, by the second terminal device, that the first resource is available according to second information includes: when the second information meets a preset condition, the second terminal equipment determines that the first resource is available, and the preset condition comprises at least one of the following: the transmission type of the third data is broadcast; the transmission type of the third data is unicast or multicast and HARQ feedback is disabled; the energy measurement value associated with the third data is smaller than or equal to a preset threshold value; the first terminal device is not a target terminal device for the third data.

With reference to the second aspect, in certain implementations of the second aspect, before the second terminal device transmits the target information on the first resource, the method further includes: the second terminal equipment receives first indication information from the first terminal equipment, wherein the first indication information is used for indicating the second terminal equipment to send the second data to the first terminal equipment on the second resource; or the second terminal equipment receives second indication information from the first terminal equipment, wherein the second indication information is used for indicating the second terminal equipment to send the second feedback information to the first terminal equipment on the first resource.

With reference to the second aspect, in certain implementations of the second aspect, the target information includes the second data, the method further includes: the second terminal device sends third indication information, and the third indication information indicates that the second resource comprises the first resource.

When the second terminal equipment uses the second resource comprising the first resource to send the second data, the third indication information can be sent, so that the first terminal equipment can know that the second terminal equipment uses the first resource, and the reliability of data transmission is ensured.

In a third aspect, a method of side-uplink communication is provided, comprising: the method comprises the steps that a first terminal device obtains channel access time COT, wherein the COT comprises a first time slot, and the first time slot comprises PSFCH symbols; the first terminal equipment determines that a first resource is available according to second information, wherein the first resource is a resource in the PSFCH symbol, and the second information comprises at least one of the following: a transmission type of third data, the third data HARQ feedback type, an energy measurement value associated with the third data, and whether the first terminal device is a target terminal device of the third data, where the third data is data transmitted on a second time slot, and the second time slot is at least one time slot determined according to the feedback timing and the first time slot.

In this embodiment, after the first terminal device acquires the COT, it determines the available first resources on the PSFCH symbol in the first slot in the COT, specifically, whether the data transmission in the associated slot of the first slot needs feedback or whether the data transmitted in the third slot uses the first terminal device as the target terminal device determines the available first resources on the PSFCH symbol, where the first resources may be used for transmitting various information subsequently. For details, reference may be made to the detailed description of step S620 of the method 600, which is not repeated here.

With reference to the third aspect, in some implementations of the third aspect, the determining, by the first terminal device, that the first resource is available according to the second information includes: when the second information meets a preset condition, the first terminal device determines that the first resource is available, and the preset condition comprises at least one of the following: the transmission type of the third data is broadcast; the transmission type of the third data is unicast or multicast and HARQ feedback is disabled; the energy measurement value associated with the third data is smaller than or equal to a preset threshold value; the first terminal device is not a target terminal device for the third data.

With reference to the third aspect, in certain implementations of the third aspect, the second time slot is a time slot used by the first terminal device.

In a fourth aspect, a method of side-link communication is provided, the method comprising: the method comprises the steps that a second terminal device receives COT indication information from a first terminal device, wherein a time unit indicated by the COT indication information comprises a first time slot, and the first time slot comprises a PSFCH symbol; the second terminal equipment determines that a first resource is available according to second information, wherein the first resource is a resource in the PSFCH symbol, and the second information comprises at least one of the following: a transmission type of third data, the third data HARQ feedback type, an energy measurement value associated with the third data, and whether the first terminal device is a target terminal device of the third data, where the third data is data transmitted on a second time slot, and the second time slot is at least one time slot determined according to the feedback timing and the first time slot.

For details of this embodiment, reference may be made to the details of step S620 of the method 600 and the details of step S1120 of the method 1100, which are not described herein.

With reference to the fourth aspect, in some implementations of the fourth aspect, the determining, by the second terminal device, that the first resource is available according to second information includes: when the second information meets a preset condition, the second terminal equipment determines that the first resource is available, and the preset condition comprises at least one of the following: the transmission type of the third data is broadcast; the transmission type of the third data is unicast or multicast and HARQ feedback is disabled; the energy measurement value associated with the third data is smaller than or equal to a preset threshold value; the first terminal device is not a target terminal device for the third data.

With reference to the fourth aspect, in some implementations of the fourth aspect, the second time slot is a time slot used by the first terminal device.

In a fifth aspect, there is provided a method of side-link communication, the method comprising: the first terminal device determines that a first resource in a PSFCH symbol is available in a first time slot according to second information, wherein the first time slot is located in COT of the first terminal device, and the second information comprises at least one of the following: a transmission type of third data, the third data HARQ feedback type, an energy measurement value associated with the third data, and whether the first terminal device is a target terminal device of the third data, wherein the third data is data transmitted on a second time slot, and the second time slot is at least one time slot determined according to the feedback timing and the first time slot; the first terminal device transmits target information on the first resource.

In this embodiment, the first terminal device may determine a first resource available on the PSFCH symbol in the first slot in the COT, specifically, whether the data transmission in the associated slot of the first slot needs feedback or whether the data transmitted in the third slot uses the first terminal device as a target terminal device may determine the first resource available on the PSFCH symbol, where the first resource may be subsequently used for the first terminal device to transmit the target information, so as to improve the resource utilization, and further, if the resource of the PSFCH symbol is not used at all, the first terminal device may use the first resource to reduce the possibility of the COT interruption. Details of how the first terminal device determines that the first resource is available and how to use the first resource to transmit the target information in this embodiment may refer to corresponding details of the method 600, which are not described herein.

With reference to the fifth aspect, in some implementations of the fifth aspect, the target information includes one of first data, second data, first feedback information, and second feedback information, where the first data is data to be sent by the first terminal device on the first timeslot, the second data is data to be received by the first terminal device on the first timeslot, the first feedback information is feedback information to be sent by the first terminal device, and the second feedback information is feedback information to be received by the first terminal device.

With reference to the fifth aspect, in certain implementation manners of the fifth aspect, the transmitting, by the first terminal device, target information on the first resource includes: when the target information comprises the first data, the first terminal equipment sends the first data on a second resource, and the second resource comprises the first resource; when the target information comprises the second data, the first terminal device receives the second data on the second resource, wherein the second resource comprises the first resource; when the target information comprises the first feedback information, the first terminal equipment sends the first feedback information on the first resource; and when the target information comprises the second feedback information, the first terminal equipment receives the second feedback information on the first resource.

With reference to the fifth aspect, in some implementations of the fifth aspect, the determining, by the first terminal device, that the first resource is available according to the second information includes: when the second information meets a preset condition, the first terminal device determines that the first resource is available, and the preset condition comprises at least one of the following: the transmission type of the third data is broadcast; the transmission type of the third data is unicast or multicast and HARQ feedback is disabled; the energy measurement value associated with the third data is smaller than or equal to a preset threshold value; the first terminal device is not a target terminal device for the third data.

With reference to the fifth aspect, in certain implementations of the fifth aspect, resources included in the PSFCH symbol are available.

With reference to the fifth aspect, in certain implementations of the fifth aspect, the resource portion included in the PSFCH symbol is available, and the target information includes one of the first feedback information and the second feedback information.

With reference to the fifth aspect, in certain implementations of the fifth aspect, the second resource further includes at least one of: the resources corresponding to the AGC symbols in the first time slot, the resources corresponding to the GAP time units in the first time slot and the resources corresponding to the CPE time units in the first time slot.

With reference to the fifth aspect, in some implementations of the fifth aspect, when the first resource is used to send the first feedback information and the first terminal device sends data in the first time slot, the resource used by the first terminal device to send the first data includes a resource corresponding to a GAP time unit in the first time slot; or when the first resource is used for receiving the second feedback information and the first terminal device receives data in the first time slot, the first terminal device is used for receiving the second data and comprises resources corresponding to the GAP time unit in the first time slot.

With reference to the fifth aspect, in certain implementation manners of the fifth aspect, the first terminal device transmits target information on the first resource according to at least one item of first information, where the first information includes: a priority of the first data; a priority of the second data; the priority of the first feedback information; and the priority of the second feedback information.

With reference to the fifth aspect, in certain implementation manners of the fifth aspect, the first terminal device transmits target information on the first resource according to at least one item of first information, where the first information includes: delay information of the first data; delay information of the second data; delay information of the first feedback information; and delay information of the second feedback information.

With reference to the fifth aspect, in certain implementation manners of the fifth aspect, before the first terminal device transmits the target information on the first resource, the method further includes: the first terminal equipment sends first indication information to second terminal equipment, wherein the first indication information is used for indicating the second terminal equipment to send the second data to the first terminal equipment on the second resource; or the first terminal equipment sends second indication information to second terminal equipment, wherein the second indication information is used for indicating the second terminal equipment to send the second feedback information to the first terminal equipment on the first resource.

In a sixth aspect, there is provided a communication apparatus comprising: a determining unit, configured to determine, according to second information, that a first resource in a PSFCH symbol is available in a first slot, where the first slot is located in a COT of a communication device, where the second information includes at least one of: a transmission type of third data, the third data HARQ feedback type, an energy measure associated with the third data, and whether the communication device is a target communication device for the third data, wherein the third data is data transmitted on a second time slot, the second time slot being at least one time slot determined according to the feedback timing and the first time slot; and the receiving and transmitting unit is used for transmitting the target information on the first resource.

In this embodiment, the determining unit may determine the first resource available on the PSFCH symbol in the first slot in the COT, specifically, whether the data transmission in the associated slot of the first slot needs feedback or whether the data transmitted in the third slot is targeted for the communication device may determine the first resource available on the PSFCH symbol, where the first resource may be subsequently used for the communication device to transmit the targeted information, so as to improve the resource utilization, and further, if the resource of the PSFCH symbol is not used at all, the possibility of the COT interruption may be reduced by using the first resource by the communication device. Details of how the communication device determines that the first resource is available and how to transmit the target information using the first resource in this embodiment may refer to corresponding details of the method 600, and will not be described here again.

With reference to the sixth aspect, in certain implementations of the sixth aspect, the target information includes one of first data, second data, first feedback information, and second feedback information, where the first data is data to be sent by the communication device on the first time slot, the second data is data to be received by the communication device on the first time slot, the first feedback information is feedback information to be sent by the communication device, and the second feedback information is feedback information to be received by the communication device.

With reference to the sixth aspect, in certain implementation manners of the sixth aspect, the transceiver unit is specifically configured to: transmitting the first data on a second resource when the target information includes the first data, the second resource including the first resource; receiving the second data on the second resource when the target information includes the second data, the second resource including the first resource; when the target information comprises the first feedback information, sending the first feedback information on the first resource; and when the target information comprises the second feedback information, receiving the second feedback information on the first resource.

With reference to the sixth aspect, in certain implementation manners of the sixth aspect, the determining unit is specifically configured to: and when the second information meets a preset condition, determining that the first resource is available, wherein the preset condition comprises at least one of the following: the transmission type of the third data is broadcast; the transmission type of the third data is unicast or multicast and HARQ feedback is disabled; the energy measurement value associated with the third data is smaller than or equal to a preset threshold value; the communication device is not the target communication device of the third data.

With reference to the sixth aspect, in certain implementations of the sixth aspect, resources included in the PSFCH symbol are available.

With reference to the sixth aspect, in certain implementations of the sixth aspect, the resource portion included in the PSFCH symbol is available, and the target information includes one of the first feedback information and the second feedback information.

With reference to the sixth aspect, in certain implementations of the sixth aspect, the second resource further includes at least one of: the resources corresponding to the AGC symbols in the first time slot, the resources corresponding to the GAP time units in the first time slot and the resources corresponding to the CPE time units in the first time slot.

With reference to the sixth aspect, in certain implementations of the sixth aspect, when the first resource is used to send the first feedback information and the communication device sends data in the first time slot, the resource used by the communication device to send the first data includes a resource corresponding to a GAP time unit in the first time slot; or when the first resource is used for receiving the second feedback information and the communication device receives data in the first time slot, the communication device is used for receiving the second data and comprises resources corresponding to the GAP time units in the first time slot.

With reference to the sixth aspect, in certain implementation manners of the sixth aspect, the transceiver unit is configured to transmit, on the first resource, target information according to at least one item of first information, where the first information includes: a priority of the first data; a priority of the second data; the priority of the first feedback information; and the priority of the second feedback information.

With reference to the sixth aspect, in certain implementation manners of the sixth aspect, the transceiver unit is configured to transmit, on the first resource, target information according to at least one item of first information, where the first information includes: delay information of the first data; delay information of the second data; delay information of the first feedback information; and delay information of the second feedback information.

With reference to the sixth aspect, in certain implementation manners of the sixth aspect, the transceiver unit is further configured to: transmitting first indication information to a second terminal device, wherein the first indication information is used for indicating the second terminal device to transmit the second data to the communication device on the second resource; or sending second indication information to a second terminal device, where the second indication information is used to instruct the second terminal device to send the second feedback information to the communication device on the first resource. In a seventh aspect, there is provided a side-link communication method, including: the second terminal equipment determines that a first resource is available according to second information, wherein the first resource is a resource in a PSFCH symbol on a first time slot, the first time slot is in COT of the first terminal equipment, and the second information comprises at least one of the following: a transmission type of third data, the third data HARQ feedback type, an energy measurement value associated with the third data, and whether the first terminal device is a target terminal device of the third data, wherein the third data is data transmitted on a second time slot, and the second time slot is at least one time slot determined according to the feedback timing and the first time slot; the second terminal device transmits target information on the first resource.

The description of how the second terminal device determines that the first resource is available and how the first resource is specifically used for transmitting the target information in this embodiment may refer to the description of how the first terminal device determines that the first resource is available and how the first resource is specifically used in the method 600 and the corresponding description in the method 1100, which are not repeated herein for brevity.

With reference to the seventh aspect, in some implementations of the seventh aspect, the target information includes one of first data, second data, first feedback information, and second feedback information, where the first data is data to be received by the second terminal device on the first timeslot, the second data is data to be sent by the second terminal device on the first timeslot, the first feedback information is feedback information to be received by the second terminal device, and the second feedback information is feedback information to be sent by the second terminal device.

With reference to the seventh aspect, in certain implementation manners of the seventh aspect, the transmitting, by the second terminal device, target information on the first resource includes: when the target information comprises the first data, the second terminal equipment receives the first data on a second resource, wherein the second resource comprises the first resource; when the target information comprises the second data, the second terminal equipment sends the second data on the second resource, wherein the second resource comprises the first resource; when the target information comprises the first feedback information, the second terminal equipment receives the first feedback information on a first resource; and when the target information comprises the second feedback information, the second terminal equipment sends the second feedback information on the first resource.

With reference to the seventh aspect, in certain implementations of the seventh aspect, resources included in the PSFCH symbol are available.

With reference to the seventh aspect, in certain implementations of the seventh aspect, the resource portion included in the PSFCH symbol is available, and the target information includes the first feedback information or the second feedback information.

With reference to the seventh aspect, in certain implementations of the seventh aspect, the second resource further includes at least one of: the resources corresponding to the AGC symbols in the first time slot, the resources corresponding to the GAP time units in the first time slot and the resources corresponding to the CPE time units in the first time slot.

With reference to the seventh aspect, in certain implementations of the seventh aspect, when the first resource is used to receive the first feedback information and the second terminal device receives data in the first time slot, the resource used by the second terminal device to receive the first data includes a resource corresponding to a GAP time unit in the first time slot; or when the first resource is used for sending the second feedback information and the second terminal device sends data in the first time slot, the second terminal device is used for sending the second data to include resources corresponding to the GAP time unit in the first time slot.

With reference to the seventh aspect, in certain implementation manners of the seventh aspect, the second terminal device transmits target information on the first resource according to at least one item of first information, where the first information includes: a priority of the first data; a priority of the second data; the priority of the first feedback information; and the priority of the second feedback information.

With reference to the seventh aspect, in certain implementation manners of the seventh aspect, the second terminal device transmits target information on the first resource according to at least one item of first information, where the first information includes: delay information of the first data; delay information of the second data; delay information of the first feedback information; and delay information of the second feedback information.

With reference to the seventh aspect, in some implementations of the seventh aspect, the determining, by the second terminal device, that the first resource is available according to second information includes: when the second information meets a preset condition, the second terminal equipment determines that the first resource is available, and the preset condition comprises at least one of the following: the transmission type of the third data is broadcast; the transmission type of the third data is unicast or multicast and HARQ feedback is disabled; the energy measurement value associated with the third data is smaller than or equal to a preset threshold value; the first terminal device is not a target terminal device for the third data.

With reference to the seventh aspect, in certain implementation manners of the seventh aspect, before the second terminal device transmits the target information on the first resource, the method further includes: the second terminal equipment receives first indication information from the first terminal equipment, wherein the first indication information is used for indicating the second terminal equipment to send the second data to the first terminal equipment on the second resource; or the second terminal equipment receives second indication information from the first terminal equipment, wherein the second indication information is used for indicating the second terminal equipment to send the second feedback information to the first terminal equipment on the first resource.

With reference to the seventh aspect, in certain implementations of the seventh aspect, the target information includes the second data, the method further includes: the second terminal device sends third indication information, and the third indication information indicates that the second resource comprises the first resource.

An eighth aspect provides a communication apparatus comprising: a determining unit, configured to determine, according to second information, that a first resource is available, where the first resource is a resource in a PSFCH symbol on a first timeslot, where the first timeslot is in a COT of a first terminal device, and the second information includes at least one of: a transmission type of third data, the third data HARQ feedback type, an energy measurement value associated with the third data, and whether the first terminal device is a target terminal device of the third data, wherein the third data is data transmitted on a second time slot, and the second time slot is at least one time slot determined according to the feedback timing and the first time slot; and the receiving and transmitting unit is used for transmitting the target information on the first resource.

The description of how the communication apparatus determines that the first resource is available and how the first resource is specifically used for transmitting the target information in this embodiment may refer to the description of how the first terminal device determines that the first resource is available and how the first resource is specifically used in the method 600 and the corresponding description in the method 1100, which are not repeated herein for brevity.

With reference to the eighth aspect, in some implementations of the eighth aspect, the target information includes one of first data, second data, first feedback information, and second feedback information, where the first data is data to be received by the communication device on the first time slot, the second data is data to be sent by the communication device on the first time slot, the first feedback information is feedback information to be received by the communication device, and the second feedback information is feedback information to be sent by the communication device.

With reference to the eighth aspect, in certain implementation manners of the eighth aspect, the transceiver unit is specifically configured to: receiving the first data on a second resource when the target information includes the first data, the second resource including the first resource; transmitting the second data on the second resource when the target information includes the second data, the second resource including the first resource; receiving the first feedback information on a first resource when the target information includes the first feedback information; and when the target information comprises the second feedback information, transmitting the second feedback information on the first resource.

With reference to the eighth aspect, in certain implementations of the eighth aspect, resources included in the PSFCH symbol are available.

With reference to the eighth aspect, in certain implementations of the eighth aspect, the resource portion included in the PSFCH symbol is available, and the target information includes the first feedback information or the second feedback information.

With reference to the eighth aspect, in certain implementations of the eighth aspect, the second resource further includes at least one of: the resources corresponding to the AGC symbols in the first time slot, the resources corresponding to the GAP time units in the first time slot and the resources corresponding to the CPE time units in the first time slot.

With reference to the eighth aspect, in certain implementations of the eighth aspect, when the first resource is used to receive the first feedback information and the communication device receives data in the first time slot, the resource used by the communication device to receive the first data includes a resource corresponding to a GAP time unit in the first time slot; or when the first resource is used for sending the second feedback information and the communication device sends data in the first time slot, the communication device is used for sending the second data to comprise the resource corresponding to the GAP time unit in the first time slot.

With reference to the eighth aspect, in certain implementation manners of the eighth aspect, the transceiver unit is configured to transmit, on the first resource, target information according to at least one of first information, where the first information includes: a priority of the first data; a priority of the second data; the priority of the first feedback information; and the priority of the second feedback information.

With reference to the eighth aspect, in certain implementation manners of the eighth aspect, the transceiver unit is configured to transmit, on the first resource, target information according to at least one of first information, where the first information includes: delay information of the first data; delay information of the second data; delay information of the first feedback information; and delay information of the second feedback information.

With reference to the eighth aspect, in certain implementations of the eighth aspect, the determining unit is specifically configured to: when the second information meets a preset condition, the second terminal equipment determines that the first resource is available, and the preset condition comprises at least one of the following: the transmission type of the third data is broadcast; the transmission type of the third data is unicast or multicast and HARQ feedback is disabled; the energy measurement value associated with the third data is smaller than or equal to a preset threshold value; the first terminal device is not a target terminal device for the third data.

With reference to the eighth aspect, in certain implementation manners of the eighth aspect, the transceiver unit is further configured to: receiving first indication information from the first terminal equipment, wherein the first indication information is used for indicating the communication device to send the second data to the first terminal equipment on the second resource; or receiving second indication information from the first terminal equipment, wherein the second indication information is used for indicating the communication device to send the second feedback information to the first terminal equipment on the first resource.

With reference to the eighth aspect, in certain implementation manners of the eighth aspect, the target information includes the second data, and the transceiver unit is further configured to: and sending third indication information, wherein the third indication information indicates that the second resource comprises the first resource.

A ninth aspect provides a communications apparatus comprising means for implementing the functionality of the method as in the first aspect or any implementation of the first aspect to the fifth aspect or any implementation of the fifth aspect, the seventh aspect or any implementation of the seventh aspect.

In a tenth aspect, there is provided a communication device comprising: a processor and a transceiver for receiving computer code or instructions and transmitting to the processor, the processor executing the computer code or instructions to implement the method of the first aspect or any implementation manner of the first aspect to the fifth aspect or any implementation manner of the fifth aspect, the seventh aspect or any implementation manner of the seventh aspect.

In an eleventh aspect, there is provided a communication system comprising: a first terminal device, a second terminal device as in the first aspect or any implementation manner of the first aspect to the fifth aspect or any implementation manner of the fifth aspect, or the seventh aspect or any implementation manner of the method.

In a twelfth aspect, there is provided a computer-readable storage medium storing a computer program; the computer program, when run on a computer, causes the computer to perform the method as in the first aspect or any implementation manner of the first aspect to the fifth aspect or any implementation manner of the fifth aspect, the seventh aspect or any implementation manner of the seventh aspect.

Drawings

Fig. 1 is a schematic diagram of a communication system 100 suitable for use in embodiments of the present application.

Fig. 2 is a schematic diagram of periodically configured PSFCH resources.

Fig. 3 is a schematic diagram of a PSSCH resource and PSFCH resource mapping relationship.

Fig. 4 is a schematic diagram of a slot structure in NR-V2X.

Fig. 5 is a schematic diagram of a terminal device performing LBT to obtain COT.

Fig. 6 is a schematic flow chart diagram of a side-link communication method 600 provided by an embodiment of the present application.

Fig. 7 is a schematic diagram of providing a transmission data use resource according to an embodiment of the present application.

Fig. 8 is a schematic diagram of providing a transmission data use resource according to an embodiment of the present application.

Fig. 9 is a schematic diagram of a first terminal device obtaining a COT according to an embodiment of the present application

Fig. 10 is a schematic diagram of multiple transmission opportunities.

Fig. 11 is a schematic flow chart diagram of another side-link communication method 1100 provided by an embodiment of the present application.

Fig. 12 is a schematic block diagram of a communication apparatus 1200 provided in an embodiment of the present application.

Fig. 13 is a schematic block diagram of another communications apparatus 1300 provided in an embodiment of the present application.

Fig. 14 is a schematic block diagram of another communication device 1400 provided in an embodiment of the present application.

Fig. 15 is a schematic block diagram of another communication device 1500 provided by an embodiment of the present application.

Fig. 16 is a schematic block diagram of another communication device 1600 provided by an embodiment of the present application.

Detailed Description

The technical solutions in the embodiments of the present application will be described below with reference to the accompanying drawings.

The technical solution of the embodiment of the application can be applied to various communication systems, for example: global mobile communications (global system formobile communications, GSM) system, code division multiple access (code division multiple access, CDMA) system, wideband code division multiple access (wideband code division multiple access, WCDMA) system, general packet radio service (general packet radio service, GPRS), LTE system, LTE frequency division duplex (frequency division duplex, FDD) system, LTE time division duplex (time division duplex, TDD), universal mobile telecommunications system (universal mobile telecommunication system, UMTS), worldwide interoperability for microwave access (worldwide interoperability for microwave access, wiMAX) system, fifth generation (5th generation,5G) system or future evolution communication system, vehicle-to-other devices (vehicle-to-X V X), where V2X may include vehicle-to-internet (vehicle to network, V2N), vehicle-to-vehicle (vehicle to vehicle, V2V), vehicle-to-infrastructure (vehicle to infrastructure, V2I), vehicle-to-pedestrian (vehicle to pedestrian, V2P), etc., long term evolution of vehicle communications (long term evolution-vehicle, LTE-V), vehicle networking, machine-like communications (machine type communication, MTC), internet of things (Internet of things, ioT), inter-machine long term evolution (long term evolution-machine, LTE-to-M), machine-to-devices (machine to machine, machine-to-device (672D), machine-to device (672D), etc.

The network device in the embodiment of the present application may be any device having a wireless transceiver function. The apparatus includes, but is not limited to: an evolved node B (eNB), a radio network controller (radio network controller, RNC), a Node B (NB), a radio network controller (radio network controller, RNC), a base station controller (base station controller, BSC), a base transceiver station (base transceiver station, BTS), a home base station (e.g., home evolved nodeB, or home node B, HNB), a Base Band Unit (BBU), an Access Point (AP) in a wireless fidelity (wireless fidelity, WIFI) system, a wireless relay node, a wireless backhaul node, a transmission point (transmission point, TP), or a transmission reception point (transmission and reception point, TRP), etc., may also be 5G, e.g., NR, a gNB in a system, or a transmission point (TRP or TP), an antenna panel of a base station or a group (including multiple antenna panels) in a 5G system, or may also be a network node constituting a gNB or a transmission point, e.g., a Base Band Unit (BBU), or a Distributed Unit (DU), etc.

For example, the network device may be a legacy macro base station in a legacy universal mobile telecommunications system (universal mobile telecommunications system, UMTS)/LTE wireless communication system, a micro base station in a heterogeneous network (heterogeneous network, hetNet) scenario, a BBU and remote radio unit (remote radio unit, RRU) in a distributed base station scenario, and a baseband pool (BBU pool) and RRU in a cloud radio access network (cloud radio access netowrk, CRAN) scenario.

In some deployments the network device may include a Centralized Unit (CU) and a DU, or an access network (radio access network, RAN) device including CU nodes and DU nodes. For example, in an LTE system, RAN equipment including CU nodes and DU nodes splits protocol layers of an eNB in the LTE system, functions of part of the protocol layers are put in CU centralized control, and functions of the rest part or all of the protocol layers are distributed in DUs, which are centralized control by the CU. The gNB may also include an active antenna unit (active antenna unit, abbreviated as AAU). For example, in a 5G system, a CU implements part of the functionality of the gNB and a DU implements part of the functionality of the gNB. For example, the CU is responsible for handling non-real time protocols and services, implementing the functions of the radio resource control (radio resource control, RRC), packet data convergence layer protocol (packet data convergence protocol, PDCP) layer. The DUs are responsible for handling physical layer protocols and real-time services, implementing the functions of the radio link control (radio link control, RLC), medium access control (media access control, MAC) and Physical (PHY) layers. The AAU realizes part of physical layer processing function, radio frequency processing and related functions of the active antenna. Since the information of the RRC layer may eventually become information of the PHY layer or be converted from the information of the PHY layer, under this architecture, higher layer signaling, such as RRC layer signaling, may also be considered to be transmitted by the DU or by the du+aau. It is understood that the network device may be a device comprising one or more of a CU node, a DU node, an AAU node. In addition, the CU may be divided into network devices in the RAN, or may be divided into network devices in a Core Network (CN), which is not limited in this application.

The terminal device in the embodiments of the present application may refer to a user device, an access terminal, a subscriber unit, a subscriber station, a mobile station, a remote terminal, a mobile device, a user terminal, a wireless communication device, a user agent, or a user apparatus. The terminals in the embodiments of the present application may be mobile phones (mobile phones), tablet computers (pad), computers with wireless transceiving functions, virtual Reality (VR) terminals, augmented reality (augmented reality, AR) terminals, wireless terminals in industrial control (industrial control), wireless terminals in unmanned aerial vehicle (self driving), wireless terminals in remote medical (remote media), wireless terminals in smart grid (smart grid), wireless terminals in transportation security (transportation safety), wireless terminals in smart city (smart city), wireless terminals in smart home (smart home), cellular phones, cordless phones, session initiation protocol (session initiation protocol, SIP) phones, wireless local loop (wireless local loop, WLL) stations, personal digital assistants (personal digital assistant, PDA), handheld devices with wireless communication functions, computing devices or other processing devices connected to wireless modems, wearable devices, vehicle user devices (vehicle user equipment, e), wireless terminals in smart grid (smart city), wireless terminals in smart home (smart home), wireless terminals in the future, communication terminals in the future, embedded networks of the vehicle-mounted modules, etc.

Furthermore, the terminal device may also be a terminal device in an internet of things (internet of things, ioT) system. IoT is an important component of future information technology development, and its main technical feature is to connect an item with a network through a communication technology, so as to implement man-machine interconnection and an intelligent network for object interconnection. The specific form of the terminal device is not limited in this application.

It should be understood that in the embodiment of the present application, the terminal device may be a device for implementing a function of the terminal device, or may be a device capable of supporting the terminal device to implement the function, for example, a chip system, and the device may be installed in the terminal. In the presently claimed embodiments, the chip system may be formed from a chip, or may include a chip and other discrete devices.

The communication system 100 shown in fig. 1 (a) includes a network device 10, a terminal device 20, and a terminal device 21, wherein the terminal device 20 and the terminal device 21 are both within a coverage area of the network device 10, the network device 10 and the terminal device communicate through Uu air interface, and the terminal devices 20 and 21 communicate through PC5 interface. The communication system 100 shown in fig. 1 (b) includes a network device 10, a terminal device 20, and a terminal device 21, wherein the terminal device 20 is within a coverage area of the network device 10, and the terminal device 21 is outside the coverage area of the network device 10. The communication system 100 shown in fig. 1 (c) includes a network device 10, a terminal device 20, a terminal device 21, and a terminal device 22, wherein neither the terminal device 20 nor the terminal device 21 is within the coverage of the network device 10, and the terminal device 22 is within the coverage of the network device 10.

In the scenario illustrated in (a) - (b) of fig. 1, terminal device 20 may communicate with terminal device 21 through network device scheduled resources, which may be referred to as licensed resources or licensed bands; alternatively, the terminal device 20 may communicate with the terminal device 21 by means of a resource self-selection, i.e. selecting a resource from a pool of resources, which may be referred to as unlicensed resources or unlicensed frequency bands. In the scenario shown in fig. 1 (c), since both the terminal device 20 and the terminal device 21 are in the network-free coverage, the terminal device 20 and the terminal device 21 can communicate by way of resource discretion.

It should be understood that the number of terminal devices and network devices shown in fig. 1 is only an example, and the present application does not impose any limitation on the number of terminal devices and network devices in the communication system.

For a clearer understanding of the present application, concepts applied in unlicensed spectrum communication will be explained below.

1. HARQ technique

In a wireless communication system, a hybrid automatic repeat request (hybrid automatic repeat request, HARQ) technology is generally adopted at both sides of a transceiver to ensure the accuracy of data transmission. HARQ techniques combine forward error correction (forward error correction, FEC) with automatic repeat request (automatic repeat request, ARQ), and after a data block (commonly referred to as a Transport Block (TB)) has been encoded, information bits and a portion of the redundancy bits are sent for the first transmission. If the receiving end can decode correctly, an ACK (acknowledgement) signal is fed back to the transmitting end, and after the transmitting end receives the ACK signal, the receiving end confirms that the corresponding information bit has been received successfully, and considers that the data block has been transmitted successfully. If the receiving end cannot decode correctly, the receiving end feeds back a negative acknowledgement (negative acknowledgement, NACK) signal to the transmitting end, and the transmitting end further transmits a part of information bits and/or redundant bits (called retransmission data) to the receiving end after receiving the NACK signal, and the receiving end decodes after combining the retransmission data with the previously received data, and if the retransmission data is still not decoded correctly, retransmission can be performed again. Along with the increase of retransmission times, information bits and/or redundant bits are continuously accumulated, and the channel coding rate is continuously reduced, so that the decoding effect can be continuously improved.

2. Resource pool

The resource pool is a set of time-frequency resources. For example, the resource pool is a set of time-frequency resources in a Sidelink (SL) that are used by a terminal device to transmit a PSSCH or to receive a physical sidelink shared channel (physical sidelink share channel, PSSCH).

For time domain resources within the resource pool, as an example, the network device may employ a bit map (bitmap) and repeat the bitmap periodically to indicate a set of subframes for SL communication among all subframes of the system.

For frequency domain resources within the resource pool, as an example, the network device may divide the frequency band for SL communication into several sub-channels, each sub-channel containing a number of resource blocks.

3. PSFCH resource

The physical side uplink feedback channel (physical sidelink feedback channel, PSFCH) resources represent resources used to transmit the PSFCH. As an example, one PSFCH occupies 2 consecutive orthogonal frequency division multiplexing (orthogonal frequency division multiplexing, OFDM symbols) in the time domain, the frequency domain being 1 physical resource block (physical resource block, PRB).

As one possible scenario, the PSFCH may be used to transmit feedback information. For example, for one PSSCH transmission, if the transmitting end carries hybrid automatic repeat request acknowledgement (hybrid automatic repeat requestacknowledgment, HARQ-ACK) feedback enable information in the control information, the receiving end may feedback corresponding Acknowledgement (ACK) or negative (negative acknowledgement, NACK) information according to the decoding result of the PSSCH. Wherein ACK or NACK information is transmitted over the PSFCH.

(1) Configuration period of PSFCH resource

The PSFCH resource may be a periodic resource configured in a resource pool. For example, assume that the period parameter isAs an example, a->The values of (2) may be 0, 1, 2, 4. If->It indicates that there are no PSFCH resources in the resource pool, i.e., the resources in the resource pool are not available for transmission of PSFCH. If->It means that in the resource pool every +.>There will be one PSFCH resource per slot.

Fig. 2 is a schematic diagram of a PSFCH resource. Fig. 2 illustrates the PSFCH configuration in the resource pool, where one slot of every 1 slot, 2 slots, and 4 slots contains PSFCH resources, taking cycle parameters of 1, 2, and 4, respectively, as examples.

(2) The timing of the HARQ feedback, i.e. the determination of the time domain resources of the PSFCH resources.

For NR-V2X, the timing of the HARQ feedback is the PSSCH to PSFCH time interval. Assuming that the end position of one PSSCH transmission is in slot n, the corresponding slot in which HARQ feedback is performed is the first slot in which there is a PSFCH resource, which may also be referred to as a PSFCH transmission opportunity, after the n+k slot and including the n+k slot. Where k represents the processing capability of the terminal, for example, k may be 2 or 3, etc.

(3) Determination of frequency domain resources of PSFCH resources

The PSFCH available resources in one PSFCH feedback slot are allocated sequentially to each subchannel in the feedback period in a time-first-frequency-domain manner.

Fig. 3 shows an example of a PSSCH resource to PSFCH resource mapping relationship. Assuming that the period parameter of the PSFCH resource allocation is 2 (i.e., one slot of every 2 slots contains PSFCH resources), the feedback timing k=2, the number of PSSCH slots corresponding to slot 3 containing PSFCH resources is 2, the number of subchannels is 2, each subchannel contains 10 PRBs, 20 PRBs available for transmitting HARQ information, and the number of PRBs configured for transmitting HARQ information is 12, as shown in fig. 3. Thus, each subchannel may correspond to 3 physical resource blocks (physical resource block, PRB), e.g., subchannel (0, 0) corresponds to a subchannel index of 0 and slot index of 0, which corresponds to feedback resources of PRB index of 0, 1, 2.

4. Licensed spectrum and unlicensed spectrum

The spectrum used by wireless communication systems is divided into two categories, licensed spectrum (licensed spectrum) and unlicensed spectrum (unlicensed spectrum). In licensed spectrum, the UE may use spectrum resources based on the scheduling of the network device. Unlicensed spectrum is mainly described below.

In unlicensed spectrum, a transmitting device may use spectrum resources in a competing manner. One possible way is for the transmitting device to contend for the channel by way of LBT, thereby using the channel resources.

5、LBT

The LBT mechanism is a channel access rule based on random back-off, that is, whether a terminal needs to monitor whether a channel is idle (idle) before accessing the channel and starting to transmit data, if the monitored channel has remained idle for a certain period of time, the channel can be occupied, and if the monitored channel is not idle, the channel can be occupied after waiting for the channel to be restored to idle again. LBT mechanisms are an essential feature for the use of unlicensed bands, as various regions of the world have regulatory requirements for the use of unlicensed bands. Terminals working in various forms of different communication protocols can only use unlicensed frequency bands if the regulations are met, so that spectrum resources can be used relatively fairly and efficiently. To meet the regulations, 3GPP organizations divide LBT mechanisms in NR systems into four classes:

LBT (category 1 LBT): after the COT is obtained, the communication device immediately sends data after a short switching gap (abbreviated as Cat 1 LBT) from the receiving state. COT refers to the time that a communication device is allowed to occupy a channel after successfully accessing the channel, wherein the time of the transition interval cannot be greater than 16us.

Two types of LBT (category 2 LBT): the LBT without random back-off, abbreviated as Cat 2 LBT, is that the communication device can transmit data without random back-off after detecting that the channel is in idle state and for a fixed period of time.

Three types of LBT (category 3 LBT): the LBT, abbreviated as Cat 3 LBT, of the fixed-size random backoff of the contention window (contention window), i.e., the communication device generates a random number N based on the fixed-size contention window, and may transmit data after listening that the channel is in an idle state for a period of time determined according to the random number N. Wherein the size of the contention window is related to the minimum and maximum values of N.

Four types of LBT (category 4 LBT): the random back-off LBT with a variable contention window, abbreviated as Cat 4 LBT, is that the communication device generates a random number N based on the contention window with a variable size, and can transmit data after sensing that the channel is in an idle state and for a period of time determined according to the random number N. Wherein the size of the contention window is related to the minimum and maximum values of N, the communication device may change the size of the contention window.

NR-U device follows 3GPP protocol, and adopts LBT mechanism as channel access method. Specifically, NR-U devices use several types of LBT as follows.

Type 1 LBT: cat 4 LBT. The NR-U device needs to perform a random backoff before accessing the channel and transmitting data. In particular, the network device or terminal device may transmit data over an extended duration (refer to this time as T) _d ) After the first listening slot period (sensing slot duration) when the listening channel is idle and after the counter N is zero in step 4 below, a transmission is initiated. Specifically, the counter N is adjusted by listening to the channel for additional listening slot periods according to the following steps.

Step 1: setting n=n _init Step 4 is then performed. Wherein N is _init Is in the range of 0 to CW _p Random number, CW of (2) _p Is a contention window (contention window).

Step 2: if N >0, the network device or the terminal device chooses to decrease the counter value, e.g. set n=n-1.

Step 3: listening to the channel for an additional listening slot period, if the channel of the additional listening slot period is idle, performing step 4; otherwise, step 5 is performed.

Step 4: stopping if n=0; otherwise, step 2 is performed.

Step 5: listening to the channel until at another T _d Internal detectionHearing the channel busy or hearing another T _d All listening slots in the channel are detected as idle.

Step 6: if at another T _d Detecting that the interception time slots in the channel are idle, and executing the step 4; otherwise, step 5 is performed.

T as described above _d Includes T _f =16us and subsequent consecutive m _p Each successive listening slot period (denoted as T _sl )。m _p See table 1 for values of (c). Wherein CW is _min,p For the contention window minimum, CW _max,p For the maximum value of the contention window, W _min,p ≤CW _p ≤ CW _max,p 。T _mcot,p For maximum length of COT, i.e. COT transmitted by network device or terminal device on channel not exceeding T _mcot,p 。

TABLE 1

Type 2A LBT: cat 2 LBT at 25us intervals. The NR-U device may access the channel and transmit data after listening to the channel idle 25 us.

Type 2B LBT: cat 2 LBT at 16us intervals. The NR-U device may access the channel and transmit data after listening to the channel idle 16 us.

Type 2C LBT: cat 1 LBT at intervals of up to 16 us. The NR-U device does not need to listen to the channel and can directly access the channel and transmit data after a transition interval of up to 16us in the COT.

6. NR-V2X time slot structure

Fig. 4 is a schematic diagram of a slot structure of NR-V2X.

Under the standard cyclic prefix (normal cyclic prefix, NCP), one slot includes 14 symbols.

The slot structure without PSFCH resources is shown in fig. 4 (a), and the 1 st symbol of each slot (symbol 0 in fig. 4 (a)) is used for automatic gain control (automatic gain control, AGC). The number of symbols in each slot that are used to carry the side-link control channels (physical sidelink control channel, PSCCH) that carry the first-level side-control information (sidelink control information, SCI) is configured on each resource pool, and can be 2 to 3 symbols (symbols 1 and 2 in fig. 4 (a)). The last symbol of each slot is a Guard Period (GP). The remaining symbols in the slot may be used to transmit data and the second stage SCI.

The slot structure containing the PSFCH resources is shown in fig. 4 (b), which illustrates the 12 th symbol and 13 th symbol of the slot for carrying the PSFCH. The 1 st symbol of each slot (e.g., symbol 0 in (b) of fig. 4) is used for AGC. The number of symbols in each slot for carrying the PSCCH carrying the first stage SCI is configured on each resource pool and may be 2 to 3 symbols (symbols 1 and 2 in the (b) diagram of fig. 4). The last symbol and 11 th symbol of each slot (e.g., symbols 10 and 13 in fig. 4 (b)) are GP. The remaining symbols in the slot may be used to transmit data and the second stage SCI.

Under the extended cyclic prefix (extendedcyclic prefix, ECP), one slot includes 12 symbols.

The slot structure containing no PSFCH resources and the slot structure containing PSFCH resources are shown in fig. 4 (c) and fig. 4 (d), respectively, and ECP is reduced by only PSSCH symbols compared with NCP, and other designs in the slot are identical, i.e., the last four symbols of the slot are identical with NCP.

Fig. 5 shows a schematic diagram of a terminal device performing LBT to obtain COT.

As shown in fig. 5, in the unlicensed spectrum, the terminal device obtains a COT through LBT, where the COT includes a time slot n+1, a time slot n+2, a time slot n+3, and a time slot n+4, where the time slot n+1 and the time slot n+3 are respectively preconfigured with feedback resources corresponding to the PSFCH symbol. Taking feedback resource b in time slot n+3 as an example, the feedback resource b may be used to feedback data in time slot n and time slot n+1.

However, if the data in the slot n+1 or the slot n+2 does not need feedback, part of the resources in the feedback resource b may be wasted. Further, if the data in the time slot n+1 and the time slot n+2 do not need to be fed back, other terminal devices may succeed in LBT on the PSFCH symbol corresponding to the feedback resource b, so that the original terminal device COT is interrupted.

Based on the above problems, the present application provides a side uplink communication method, which can enable a pre-configured PSFCH resource to be effectively utilized when a terminal device communicates with a side uplink system based on an unlicensed spectrum, and reduce the problem of COT interruption generated when the terminal device communicates.

Fig. 6 illustrates a side-link communication method 600 provided in an embodiment of the present application, the method including:

at S610, the first terminal device acquires a channel access time COT, where the COT includes a first slot, and the first slot includes a PSFCH symbol.

In S610, the first terminal device acquires the COT, which may be understood as the first terminal device initial COT or the first terminal device initial COT. COT may be understood as a set of time-frequency resources acquired by a first terminal device. That is, the first terminal device acquires the set of time-frequency resources and may use or allocate resources in the set of time-frequency resources.

The manner in which the first terminal device obtains the COT includes that the first terminal device obtains the COT through a channel access procedure, that is, accesses a channel through the LBT. For example, the first terminal device may obtain the COT from the resource pool through Type 1 LBT (i.e., a channel access procedure of Type 1). The COT may comprise several time slots in the time domain. Illustratively, the COT may be S slots in length, S being a positive integer. Alternatively, the COT may include a length in the time domain that is an absolute length of time, including seconds, milliseconds, microseconds, and the like. Illustratively, the COT may be J milliseconds (ms) in length, J being a positive integer. The time domain units of the COT may also be symbols, subframes, frames, which are not limited in this application.

The COT may include one or more frequency domain units in the resource pool in the frequency domain. The frequency domain unit may be a first set of resource blocks. The first set of resource blocks is a set of resource blocks, here broadly referred to, for indicating one channel. The first set of resource blocks may be understood as 20MHz, i.e. the frequency domain unit in which the terminal device performs LBT. The frequency domain unit may also be a subchannel, wherein a subchannel may be a set of consecutive resource blocks or a set of interleaved resource blocks. A set of interleaved resource blocks may be understood as a set of resource blocks that are discrete, evenly distributed in the frequency domain. A set of interleaved resource blocks may be understood as a set of discrete or frequency domain non-contiguous resource blocks.

The interlace includes at least one resource block. For example, the number of resource blocks included in the interlace may be preconfigured or configured or predefined. Interleaving can be understood as RB interleaving, subchannels, RB sets, discrete RB sets, interleaving. The number of resource blocks included in one interlace may be related to the subcarrier spacing.

Illustratively, it is assumed that one slot including PSFCH resources includes M interlaces. The interlace M e {0,1, …, M-1} of M interlaces, which consists of common resource blocks { M, m+m,2m+m,3m+m, … } where M is the number of interlaces given in numbering table 1. Interleaved resource blocks in bandwidth part/channel/resource pool/spectrum/part bandwidth/resource block set i and interlace mm.epsilon. {0, 1. … } and common resource block->The relationship between them is represented by the following formula (1):

wherein,is a common resource block where the bandwidth part/channel/resource pool/spectrum/part of the bandwidth/resource block set starts with respect to common resource block 0. When there is no risk of confusion, the index subcarrier spacing μmay be deleted. A common resource block may be understood as a resource block comprised by one slot.

The number of common resource blocks in the interlaces contained in the terminal device desired bandwidth part/channel/resource pool/spectrum/part bandwidth/resource block set i is not less than 10. The number of PRBs in the interlaces corresponding to the different subcarrier spacings is shown in table 2.

TABLE 2

μ	M
		0	10
1	5

In particular, the sub-channel is a set of consecutive resource blocks or a set of staggered resource blocks may be indicated or preconfigured by the network device. Alternatively, whether the subchannels of different channels are sets of interleaved resource blocks or sets of contiguous resource blocks may be the same (the subchannels of multiple channels are each a contiguous set of resource blocks or the subchannels of multiple channels are each a set of interleaved resource blocks) or independently configured or indicated (the network device configures or indicates for each channel separately whether the set of resource blocks comprised by the subchannels is interleaved or contiguous). Illustratively, the different channels include PSCCH, PSSCH, physical side-link broadcast channel (physical sidelink broadcast channel, PSBCH), PSFCH, and the like.

That is, the COT may include one or more channels, or one or more sub-channels, in the frequency domain.

One resource pool may include one or more first resource block sets (RBs sets, channels). Here, in order to avoid interference between different channels, there is a guard band (guard band) between two adjacent first resource block sets. The guard bandwidth, also referred to as intra-cell guard bandwidth, includes one or more resource blocks. Alternatively, the protection bandwidth may be configured on the resource pool or pre-configured on the resource pool.

The Resource Blocks (RBs) described in the specification may be understood as PRBs or may be understood as virtual resource blocks (virtual resource block, VRBs).

The first terminal device may perform a channel access procedure on one or more channels. Alternatively, the channel access procedure is performed independently on each channel, and the first terminal device may succeed in accessing on one of the channels, or may succeed in accessing on a plurality of channels.

When the first terminal equipment successfully accesses a plurality of channels, the protection bandwidth between two adjacent first resource block sets can be used for transmitting data, so that the resource utilization rate is improved.

The PSFCH symbol is a time domain resource used to transmit the PSFCH. The symbols in the PSFCH symbol may be replaced with other time domain units or time domain granularity. The PSFCH symbol may be one symbol or a plurality of symbols, for example. The PSFCH symbol may also be understood as a resource used for transmitting the PSFCH.

In particular, the PSFCH resources may be configured or preconfigured within the resource pool. That is, the PSFCH resources are system-level configured and the end devices within the resource pool are consistent with the understanding of the PSFCH resources within the resource pool. Alternatively, the PSFCH resources may be periodically configured, or configured in a pattern. Wherein the pattern may be from a set of PSFCH resource patterns configured or preconfigured by the network device. The first terminal device may determine, according to the pattern, a time slot including the PSFCH resource in the resource pool. The PSFCH resources of the system level configuration may be understood as candidate PSFCH resources. That is, configured for transmitting PSFCH but may not be used for transmitting PSFCH for transmitting other channels or signals.

When the first terminal device initializes the COT, the location of the time slot including the PSFCH resource in the COT may be determined according to the start location and the length of the COT and the location of the time slot including the PSFCH resource in the resource pool. The starting position and length of the COT are different and the position of the time slot within the COT including the PSFCH resource is different.

Specifically, the location of the time slot including the PSFCH resource in the COT may be indicated by the first terminal device using a first field after initializing the COT, and the first field may be a field in the first-stage SCI, or the second-stage SCI, or the MAC control element (MAC control element, MAC CE). Wherein the first stage SCI includes this field, the delay is relatively low compared to the second stage SCI and MAC CE. This field is included in the second stage SCI, which is relatively low latency compared to the MAC CE. The MAC CE includes this field, which can carry more bits and thus more information. The location of the time slots within the COT that include the PSFCH resources may be determined according to a pattern. Wherein the pattern may be from a set of PSFCH resource patterns configured or preconfigured by the network device. The first terminal device may determine, according to the pattern, a time slot including the PSFCH resource in the resource pool. The PSFCH symbol corresponds to a resource in the resource pool used to transmit the PSFCH, and more than one time slot including the PSFCH resource may be included in the first terminal device-initialized COT.

Alternatively, if the first terminal device does not have a slot including the PSFCH symbol in the initial COT, the first terminal device may multiplex the PSSCH with the HARQ feedback information when the first terminal device needs to transmit or receive the HARQ feedback information in the COT. For example, the first terminal device may send the COT indication information after the initial COT is successful, to indicate HARQ feedback information and PSSCH multiplexing. For example, the first terminal device may transmit a PSCCH and a pscsch, where the PSCCH indicates HARQ feedback information and a pscsch multiplex. The PSCCH includes a field that occupies 1 bit, and the 1 bit is used to indicate whether the PSCCH scheduled PSCCH includes HARQ feedback information. The HARQ feedback information may be carried in the second stage SCI or MAC CE, or the HARQ feedback information may be carried in the PSSCH by puncturing or rate matching. Specifically, the HARQ feedback information may be punctured from a Resource Element (RE) with the lowest frequency domain index of a symbol preceding the demodulation reference signal (demodulation reference signal, DMRS) of the PSSCH in order from low to high in the frequency domain and from front to back in the time domain. When rate matching is performed, the HARQ feedback information may continue to be mapped after the mapping of the second-stage SCI is completed, and the mapping may be started from the end symbol of the second-stage SCI in such a manner that the first frequency domain is from low to high and the second time domain is from front to back.

The method of multiplexing HARQ feedback information and PSSCH may be network device enabled or disabled, for example. The first terminal device may indicate HARQ feedback information and PSSCH multiplexing assuming that the network device enables HARQ feedback information and PSSCH multiplexing.

The method of multiplexing the HARQ feedback information and the PSSCH may be, for example, enabled or disabled by the first terminal device. The enabled or disabled information may be carried in the COT indication information.

S620, the first terminal device transmits target information on a first resource, wherein the first resource is a resource in a PSFCH symbol, the target information comprises one of first data, second data, first feedback information and second feedback information, the first data is data to be sent by the first terminal device on a first time slot, the second data is data to be received by the first terminal device on the first time slot, the first feedback information is feedback information to be sent by the first terminal device, and the second feedback information is feedback information to be received by the first terminal device.

In S620, the first terminal device transmits the target information using the first resource in the PSFCH symbol. The first resource is an unoccupied resource in the PSFCH symbol, and the first terminal device may transmit one of the first data, the second data, the first feedback information, and the second feedback information using the unoccupied first resource. The first resource is a resource of unoccupied ones of the resources included in the PSFCH symbol. That is, there may be other unoccupied resources in the PSFCH symbol in addition to the first resource. Illustratively, the PSFCH symbol may include M interlaces that are available resources. The first resource may be one or more of the M interlaces, M being a positive integer.

For the present application, there are two types of HARQ information, the HARQ type (type 1 HARQ) of the PSFCH resource location implicitly determined according to the PSSCH resource location, and the HARQ type (type 2 HARQ) indicating the PSFCH resource location, the former is referred to as third feedback information in the present application, and the latter is referred to as first feedback information or second feedback information in the present application. The display indication may be understood as that, since the data and the feedback information are not implicitly determined according to the position of the time-frequency resource of the PSSCH, when the feedback information needs to be sent, the terminal device that needs to send the feedback information indicates the resource carrying the feedback information. Namely, the terminal equipment which needs to send feedback information indicates the resource at which the terminal equipment which receives feedback information receives the feedback information through the indication information; or the terminal device transmitting the data instructs the terminal device receiving the data on which resource to transmit feedback on the data.

Unoccupied resources in the PSFCH symbol are resources that are not used by type 1 HARQ, i.e., the PSFCH resources are determined from the PSSCH resource locations and are not used (i.e., are available, or can be re-used or re-used). Specific unused or available conditional references or references the following describes the specific manner in which the present application determines that a first resource is available. "can be used (i.e., the method described below for this step).

In the embodiment of the present application, the first terminal device transmits the target information on the first resource, including: in the case that the target information comprises first data, the first terminal equipment transmits the first data on a second resource, and the second resource comprises the first resource; in the case that the target information comprises second data, the first terminal device receives the second data on a second resource, the second resource comprising the first resource; the method comprises the steps that under the condition that target information comprises first feedback information, first terminal equipment sends the first feedback information on a first resource; in case the target information comprises the second feedback information, the first terminal device receives the second feedback information on the first resource.

Correspondingly, the second terminal equipment receives the first data on a second resource, wherein the second resource comprises the first resource; in the case that the target information comprises second data, the second terminal device sends the second data on a second resource, wherein the second resource comprises the first resource; the second terminal equipment receives the first feedback information on the first resource under the condition that the target information comprises the first feedback information; and in the case that the target information comprises the second feedback information, the second terminal equipment transmits the second feedback information on the first resource.

It should be appreciated that in the case where the target information includes the first data or the second data, the second resource further includes a resource corresponding to the PSSCH symbol on the first slot. I.e. the first terminal device transmits the first data or receives the second data using the second resources comprising PSFCH symbols and PSSCH symbols. That is, the symbols for transmitting the PSSCH include symbols configured for transmitting the PSSCH and symbols configured for transmitting the PSFCH but not actually used. The PSFCH symbols are also actually used to transmit the PSSCH at this time. Thus, the PSSCH is transmitted with more symbols, the utilization efficiency of resources can be utilized, and the code rate of data transmission can be reduced. And COT interruption caused by that PSFCH symbols do not transmit any signal is avoided.

The target information may include the first feedback information or the second feedback information when the resources included in the PSFCH symbol are unoccupied or a part of the resources are occupied (e.g., several PRBs are used to transmit other feedback information), i.e., when all or a part of the resources included in the PSFCH symbol are unoccupied. Specifically, if the occupied resource in the PSFCH symbol is used for the first terminal device to send feedback information, the first terminal device may send the first feedback information by using a first resource in the unoccupied resource; the first terminal device may receive the first feedback information using a first one of the unoccupied resources if the occupied resource in the PSFCH symbol is for the first terminal device to receive the feedback information.

The target information may include one of the first data, the second data, the first feedback information, and the second feedback information when the resources included in the PSFCH symbol are unoccupied, i.e., when the resources included in the PSFCH symbol are all available resources. The first terminal device may transmit the four kinds of information using a first resource among the resources included in the PSFCH symbol. It should be understood that the resources included in the PSFCH symbol may be understood as the entire frequency domain resources under the PSFCH symbol. In the frequency domain, if the first terminal equipment only obtains one resource of a first resource block set (20 MHz) when initializing COT, the frequency domain resource corresponding to the PSFCH symbol is the frequency domain resource in the frequency domain range of the first resource block set; if the first terminal device obtains the resources of two or more first resource block sets (20 MHz) when initializing the COT, the frequency domain resource corresponding to the PSFCH symbol is the frequency domain resource of the two or more first resource block sets.

The determination of whether resources included in the PSFCH symbol are unoccupied or a part of the resources are occupied may be described in detail later.

In this embodiment of the present application, the first terminal device transmits, on the first resource, target information according to at least one item of first information, where the first information includes: priority of the first data; priority of the second data; priority of the first feedback information; priority of the second feedback information.

Specifically, the priority is carried in the first stage SCI (SCI-1) in the PSCCH. SCI-1 includes a priority field, a frequency domain resource allocation (frequency resource assignment, FRIV) field, a time domain resource allocation (timeresource assignment, TRIV) field, and a resource reservation period. The first terminal device may determine the type of target information transmitted on the first resource based on the priority value indicated by the priority field in SCI-1.

The target information transmitted by the first terminal device on the first resource is related to the information to be selected which needs to be sent by the first terminal device. The first terminal device may send data in the initial COT, or may share the COT to other terminal devices, that is, the other terminal devices send data to the first terminal device, and correspondingly, the first terminal device receives data from the other terminal devices.

If the first terminal equipment is about to send data in the first time slot, the information to be selected comprises first data;

the second data may be included in the information to be selected if the first terminal device is to receive data in the first time slot.

The first terminal device either transmits data or receives data, and cannot simultaneously receive and transmit. In both cases, the information to be selected may include at least one of the first feedback information and the second feedback information.

For example, if the first terminal device has feedback information which is not successfully sent to the source terminal device of the data in the data received before the first time slot, the information to be selected may include the first feedback information; the information to be selected may include second feedback information if there is feedback information not received from the target terminal device of the data in the data transmitted by the first terminal device before the first time slot.

The first feedback information and the second feedback information may be caused by a channel access procedure (LBT) failure when the first terminal device or a counterpart terminal device (target terminal device) of the first terminal device transmits the PSFCH. The resources of the PSFCH transmitted herein are implicitly determined from the time-frequency resource location of the PSSCH.

The process of determining the target information from the information to be selected according to the priority will be described below by taking the example that the information to be selected includes the first data, the first feedback information, and the second feedback information, that is, the target information is one of the first data, the first feedback information, and the second feedback information.

Since the first data is data to be transmitted by the first terminal device in the first slot, the first terminal device will transmit SCI information when transmitting the data, and the first terminal device can also learn the priority of the first data (carried in SCI information, i.e. carried in the priority field in SCI-1). The first feedback information is feedback information to be sent by the first terminal device. The first feedback information may include 1-bit or multi-bit HARQ information. Or may be a HARQ codebook. Optionally, the first feedback information may include at least one of source terminal equipment identification information, destination terminal equipment identification information, transmission type, new data rollover indication, and HARQ process number.

For example, the first feedback information (HARQ codebook) includes N-bit HARQ information, and may include at least one of N-bit HARQ, source terminal device identification information, destination terminal device identification information, transmission type, new data flip indication (new data indicator, NDI) and HARQ process number associated with the N-bit HARQ, respectively. The object is that the target terminal device for the first terminal device can understand which HARQ bit of the data packet is the HARQ bit.

The first terminal device may receive SCI information of the data in a slot in which the data is received when receiving the data corresponding to the first feedback information, the SCI information indicating a priority of the data. When more than one data Transport Block (TB) corresponds to the first feedback information, the priority of the first feedback information is the highest priority among the priorities of the TBs corresponding to the first feedback information. For example, the first feedback information includes HARQ-ACK information of 4 bits and 1101 bits, where a value of 1 for the HARQ information indicates ACK and a value of 0 indicates NACK. Assuming that the priority values corresponding to the 4 bits are 1,2,3, and 4, respectively, the priority value of the first feedback information is 1. The range of the priority values of TB is 1,2,3,4,5,6,7,8, the smaller the value the highest the priority, the more important the data.

The second feedback information is feedback information to be received by the first terminal device, and when the first terminal device sends data corresponding to the second feedback information, the first terminal device sends SCI information of the data, and the SCI information indicates priority of the data. Similarly, the second feedback information may include 1-bit or multi-bit HARQ information. Or may be a HARQ codebook. The optional second feedback information may include at least one of source terminal device identification information, destination terminal device identification information, transmission type, new data rollover indication, HARQ process number. For example, the second feedback information (HARQ codebook) includes N-bit HARQ information, and may include at least one of N-bit HARQ, source terminal device identification information associated with the N-bit HARQ, destination terminal device identification information, transmission type, new data rollover indication, and HARQ process number. The object is that the target terminal device for the first terminal device can understand which HARQ bit of the data packet is the HARQ bit.

When the data (TB) corresponding to the second feedback information is more than one, the priority of the second feedback information is the highest priority among the priorities of the plurality of TB corresponding to the first feedback information. For example, the second feedback information includes HARQ-ACK information of 4 bits and 1101 bits, where a value of 1 for the HARQ information indicates ACK and a value of 0 indicates NACK. Assuming that the priority values corresponding to the 4 bits are 1,2,3, and 4, respectively, the priority value of the second feedback information is 1. The priority of the data (TB) is in the range of 1,2,3,4,5,6,7,8, and the smaller the value is, the highest the priority is, and the more important the data is.

The terminal device may determine the target information for transmission according to the priority of the first data, the priority of the first feedback information, and the priority of the second feedback information, where the target information may be one of the three with the highest priority (the lowest priority value).

When the information to be selected includes the second data, the first terminal device can obtain SCI information of the data transmitted in the first data in the first slot, so that the priority of the second data can be obtained from the SCI information.

When the information to be selected includes the second data, the first feedback information, and the second feedback information, the first terminal device may use the same method as when the information to be selected includes the first data, the first feedback information, and the second feedback information, and use the first resource for transmitting one of the highest priority (lowest priority value) items.

Optionally, the first terminal device determines whether the first resource is used for transmitting data or feedback information according to the priority of the feedback information and the priority of the data. That is, the first terminal device may first compare the priority between the data and the feedback information, determine to transmit the data, or transmit the feedback information. The first terminal device may take the priority of the first data or the second data as the priority of the data, where the range of the priority values of the data is 1,2,3,4,5,6,7,8, and a smaller value indicates the highest priority, and the more important the data. And determining the priority of the first feedback information or the second feedback information as the priority of the feedback information, wherein the priority of the feedback information is the priority of the data associated with the HARQ included in the feedback information, and when the HARQ bits included in the feedback information are more than one, the priority of the feedback information is the highest priority in the priorities of the data associated with the HARQ included in the feedback information.

If the first resource is used for transmitting data, determining whether the target information is the first data or the second data according to whether the first terminal equipment is to transmit the data or receive the data in the first time slot. If the first resource is used for transmitting the feedback information, determining whether the first resource is used for transmitting the first feedback information or the second feedback information according to the priority of the first feedback information and the priority of the second feedback information.

Specific comparison rules are summarized below:

scene 1: the information to be selected comprises first data, first feedback information and second feedback information

The first terminal device compares the priority of the first data with the priority of the feedback information (higher priority of the first feedback information and the priority of the second feedback information). The first resource is used for sending the first data assuming that the priority of the first data is higher; if the priority of the first feedback information is higher, using the first resource to send the first feedback information; if the priority of the second feedback information is higher, the first resource is used to receive the second feedback information. Where the priority is high, i.e. the priority value is small. The priority is low, i.e. the priority value is large. For example, the priority value corresponding to the first data is 1, the priority value of the first feedback information is 2, and the priority value of the second feedback information is 4, where the priority value of the feedback information is 2 (2 is taken from 2 and 4), and the priority of the first data is higher than the priority of the feedback information (1 is smaller than 2 and indicates higher priority).

Alternatively, the first terminal device may directly compare priorities of the first data, the first feedback information, and the second feedback information, using the first resource for one of the highest priorities (lowest priority values).

Scene 2: the information to be selected comprises second data, first feedback information and second feedback information

The same principle as scenario 1.

Scene 3: the information to be selected includes second data, first feedback information

The first terminal equipment compares the priority of the second data with the priority of the first feedback information, and if the priority of the first feedback information is higher, the first resource is used for sending the first feedback information, and if the priority of the second data is higher, the first resource is used for receiving the second data.

Scene 4: the information to be selected includes second data, second feedback information

The same principle as scenario 3.

Scene 5: the information to be selected includes first data, first feedback information

The same principle as scenario 3.

Scene 5: the information to be selected includes first data and second feedback information

The same principle as scenario 3. Scene 6: the information to be selected includes first data

The first resource is used to transmit first data.

Scene 7: the information to be selected includes second data

The first resource is used to transmit the second data.

In this embodiment of the present application, the first terminal device transmits, on the first resource, target information according to at least one item of first information, where the first information includes: delay information of the first data; delay information of the second data; delay information of the first feedback information; and delay information of the second feedback information.

The first terminal device may also determine what information the first resource is used to transmit based on the delay information. Still taking the example that the information to be selected includes the first data, the first feedback information and the second feedback information, that is, the target information is one of the first data, the first feedback information and the second feedback information, a process of determining the target information from the information to be selected according to the time delay information is described. In particular, a shorter delay represents a more important data. The information to be selected comprises first data, first feedback information and second feedback information, the first terminal equipment compares delay requirements corresponding to the first data, the first feedback information and the second feedback information, determines that the delay requirement value is minimum, and uses first resources for corresponding transmission.

The delay information may be a Packet Delay Budget (PDB) that may be carried in the first stage SCI, second stage SCI, MAC CE or PC5 RRC signaling. Specific delay requirements can be obtained through the delay information.

Optionally, the first terminal device may compare the values of the delay requirements of the data and the feedback information, and determine the information with smaller values of the transmission delay requirements. I.e. the first resource is used for transmitting data or the first resource is used for transmitting feedback information. The time delay requirement of the data can be the time delay requirement with a higher time delay requirement or a smaller time delay requirement in the first data and the second data, and the time delay requirement of the feedback information can be the time delay requirement with a higher time delay requirement or a smaller time delay requirement in the first feedback information and the second feedback information.

And if the time delay requirement of the data is smaller, the first resource is used for transmitting the data. Specifically, the first resource may be used to transmit the first data or transmit the second data according to the first terminal device needs to transmit the first data or receive the second data in the first slot. I.e. the first terminal device sends the first data in the first time slot, the resources for sending the first data comprise the first resources. I.e. the first terminal device receives the second data in the first time slot, the resources for receiving the second data comprising the first resources.

And if the time delay requirement of the feedback information is smaller, the first resource is used for transmitting the feedback information. The first terminal device may further compare the values of the delay requirements of the first feedback information and the second feedback information, and use the first resource for the feedback information with smaller values of the transmission delay requirements, assuming that the feedback information includes the first feedback information and the second feedback information. And if the time delay requirement of the first feedback information is smaller, the first resource is used for transmitting the first feedback information. And if the time delay requirement of the second feedback information is smaller, the first resource is used for transmitting the second feedback information.

Optionally, the first terminal device may directly compare the sizes of the delay requirements of the first data, the first feedback information and the second feedback information, and use the first resource to transmit one of the delay requirements with a smaller value.

Optionally, the priority order and the delay requirement of the first data, the second data, the first feedback information and the second feedback information may also be configured or preconfigured by the network device.

The above describes the process of determining the target information to be transmitted according to the priority and according to the delay information, respectively, in a specific case, the target information to be transmitted may also be determined according to the combination of the priority and the delay information, and the specific process is not described herein.

In the embodiment of the present application, when the first resource is used for sending the first feedback information and the first terminal device sends data in the first time slot, the resource used for sending the first data by the first terminal device includes a resource corresponding to the GAP time unit in the first time slot; or when the first resource is used for receiving the second feedback information and the first terminal equipment receives the data in the first time slot, the first terminal equipment is used for receiving the second data, wherein the second data comprises resources corresponding to the GAP time unit in the first time slot.

GAP time units are time units in the first slot. The GAP time unit is a time unit for transmitting/receiving conversion, and the GAP time unit may be a time unit corresponding to a GP symbol in a slot (i.e., the GAP time unit is a GP symbol), or may be a time unit shorter than the GP symbol. In order to avoid the COT interruption caused by the long GP symbol in the slot, the length of the GP symbol may be shortened using a Cyclic Prefix Extension (CPE) method. Taking the timeslot with PSFCH resources configured as shown in fig. 4 (b) as an example, the CPE starts from the starting position of the symbol (symbol 11) that is the next symbol of the GP symbol, copies a period of time, translates the period of time to the GP symbol, and the end position of the copied period of time is at the end position of the GP symbol, and the result of CPE the timeslot shown in fig. 4 (b) is shown in fig. 4 (e).

Since the terminal device requires a processing time for a transmission/reception transition between transmission information and reception information, a GP symbol is located between the PSSCH symbol and the PSFCH symbol. The GP symbol is used for transmit-receive conversion. The transmission directions of the PSSCH and the PSFCH may be the same or different for the first terminal device. The transmission directions of the PSSCH and the PSFCH are the same, i.e. the first terminal device sends the PSSCH and the PSFCH or the first terminal device receives the PSSCH and the PSFCH, the first terminal device does not need the GP symbol. The transmission directions of the PSSCH and the PSFCH are different, namely, the first terminal equipment sends the PSSCH and receives the PSFCH. Or the first terminal equipment receives the PSSCH and sends PSFCH. The first terminal device needs GP symbol. The GP symbol herein also applies to GAP time units (i.e., may be replaced with GAP time units).

When the first resource is used for sending the first feedback information and the first terminal device sends data in the first time slot, the first time slot is used for the first terminal device to send the data and the feedback information, and because the data sending and the feedback information do not involve the transmit-receive conversion, the GAP time unit originally used for the transmit-receive conversion can be used for sending the data, so that the resources of the data transmission can comprise the GAP time unit besides the resources corresponding to the PSSCH symbols of the original; that is, when the first terminal device transmits data and feedback information in the first slot within the COT, GAP time units in the PSSCH symbol and the PSFCH symbol are used to transmit data. Specifically, the GAP time unit may be a copy of the previous symbol (GAP time unit is GP symbol) or a copy of a part of the resource in the previous symbol (copy of the tail of the previous symbol, where the GAP time unit is less than one symbol in length). Either the GAP time unit is a copy of the next symbol or a copy of part of the resources in the next symbol (copy of the head of the next symbol, where the GAP time unit length is less than one symbol). The GAP time unit may also be a resource that carries valid bit information, i.e., the PSSCH performs rate matching, including the resource included in the GAP time unit.

When the first resource is used for receiving the second feedback information and the first terminal device receives the data in the first time slot, the first time slot is used for the first terminal device to receive the information, and the GAP time unit originally used for the transceiver conversion is also used for the first terminal device to receive the data. That is, the resources for transmitting the PSSCH in the first slot include resources included in the GAP time unit. Specifically, the GAP time unit includes resources for rate matching (i.e. transmitting valid bit information), so that the resources for transmitting data in the first time slot are increased, the PSSCH transmission code rate is reduced, and the lower the code rate is, the stronger the reliability is. The data transmission reliability is improved. Either the GAP time unit may be a copy of the previous symbol or a copy of the tail of the previous symbol (when the GAP time unit length is less than one symbol), or the GAP time unit may be a copy of the next symbol or a copy of the head of the next symbol (when the GAP time unit length is less than one symbol).

In the case that the target information is the first data or the second data, the second resource may further include at least one of: the resources corresponding to AGC symbols in the first time slot, the resources corresponding to GAP time units in the first time slot, the resources corresponding to CPE time units in the first time slot, the resources corresponding to GP symbols in the first time slot (last symbol of the first time slot).

In the following, taking the structure of the first slot as an example in fig. 4 (b), specific resources for transmitting the first data and the second data will be described when the target information is the first data or the second data.

Specifically, taking the target information as the first data as an example, the first terminal device sends the first data on the second resource in the first time slot.

The frequency domain resource of the second resource is a frequency domain resource corresponding to the PSSCH symbol (frequency domain resource occupied by PSSCH transmission in the COT), and besides the resource corresponding to the PSSCH symbol and the first resource described above, the time domain resource of the second resource may further include at least one of the following:

GP symbol (i.e., GAP time unit, time interval between PSSCH symbol and AGC symbol), AGC symbol (preceding symbol of PSFCH symbol), GP symbol (GP symbol at the end of slot).

Illustratively, the time domain resource of the second resource may include at least one of:

case 1-1: PSSCH symbol, PSFCH symbol, GP symbol (time interval between PSSCH symbol and AGC symbol), AGC symbol (preceding symbol of PSFCH symbol).

Cases 1-2: PSSCH symbol, PSFCH symbol, GP symbol (time interval between PSSCH symbol and AGC symbol), AGC symbol (previous symbol of PSFCH symbol), GP symbol (GP symbol at the end of slot).

Case 2-1: PSSCH symbol, PSFCH symbol, AGC (symbol preceding the PSFCH symbol) symbol.

Case 2-2: PSSCH symbol, PSFCH symbol, AGC (symbol preceding the PSFCH symbol), GP symbol (GP symbol at the end of the slot).

Case 3-1: PSSCH symbols, PSFCH symbols.

Case 3-2: PSSCH symbol, PSFCH symbol, GP symbol (GP symbol at the end of the slot).

Case 4-1: PSFCH symbol, GP symbol (time interval between PSSCH symbol and AGC symbol).

Case 4-2: PSFCH symbol, GP symbol (time interval between PSSCH symbol and AGC symbol), GP symbol (GP symbol at the end of slot).

The above AGC symbol is a PSFCH AGC symbol, which itself is a duplicate of the PSFCH symbol, i.e. the content on the PSFCH symbol is completely duplicated into the AGC symbol, or understood as the AGC symbol is a duplicate of the PSFCH symbol. However, when the PSFCH symbol is used to transmit the first data, the AGC symbol is also used to transmit the data in this application, and it is understood that the AGC symbol is still a duplicate of the PSFCH symbol, that is, the data included in the PSFCH symbol. The AGC symbols may also be used directly to transmit valid bit information, i.e., including AGC symbols when PSSCH rate matched, instead of being duplicates of PSFCH symbols. The specific case is illustrated in the following figure 7:

As shown in fig. 7, fig. 7 (a) shows a scenario in which resources (symbol 12) included in the PSFCH symbol are used for data transmission according to an embodiment of the present application, symbols 1 to 9 and symbol 12 may be used for data transmission (case 3-1).

Alternatively, assuming that the directions of data transmission of the first slot and the next slot of the first slot are consistent, that is, the first terminal device sends data in the first slot and the next slot of the first slot, or the first terminal device receives data in the first slot and the next slot of the first slot, the GP symbol at the tail of the first slot may be used to transmit the PSSCH in the first slot. I.e., the symbol actually used to transmit the PSSCH, includes symbol 13 (case 3-2).

Since the first slot is used to transmit data, the GAP time unit (GP symbol or symbol 10, a symbol between PSSCH symbol and AGC symbol) for transmitting/receiving conversion, and the AGC symbol (symbol 11) for performing automatic gain control on the transmission information of the symbol 12 are no longer required to perform transmission/receiving conversion or automatic gain control, and thus can be used to transmit data. I.e., PSFCH symbols are used for transmitting data, AGC symbols of PSFCH symbols, GP symbols between PSSCH symbols and PSFCH AGC symbols are used for transmitting data (as shown in FIG. 7 (b) -FIG. 7 (d))

Fig. 7 (b) shows a scenario in which a resource corresponding to an AGC symbol (symbol 11) is used for transmitting data (case 2-1). It should be appreciated that where the AGC symbol in fig. 7 (a) is used for automatic gain control, the data of the PSFCH symbol (symbol 12) is transmitted in the symbol and the AGC symbol is not used for rate matching. I.e. the first slot contains PSFCH symbols, which can actually be used for transmitting PSSCH, but the AGC symbols preceding the PSFCH symbols are replicas of the PSFCH symbols, i.e. the data carried in the PSFCH AGC symbols, but the same data as the PSFCH symbols, the function of the PSFCH AGC is still AGC.

Optionally, the resource pool includes at least one first set of resource blocks (RB set) at this time for fig. 7 (a). The advantage of reserving the AGC symbol function is that from the point of view of the terminal device implementation, the terminal device can maintain only one AGC channel adjustment AGC in multiple RBs set, where the transmission of information in the corresponding time domain resources within the COT is affected when the resources outside the COT adjust the AGC. The AGC symbols within the COT also retain the original AGC function.

Whereas for the case of using the AGC symbol (symbol 11) in fig. 7 (b) for transmitting data, the data transmitted in this symbol is different from the data transmitted in the original PSFCH symbol, and this symbol can be used for rate matching (case 2-1). So that symbols 1-9 as well as symbols 11 and 12 can be used for the first terminal device to transmit data. I.e., the PSSCH is rate matched, includes resources on the PSFCH AGC symbols. I.e., PSSCH, starts with symbol 1 and ends with symbol 12, skipping symbol 10. I.e. the GP symbol still retains its function.

Optionally, the resource pool includes at least one first set of resource blocks (RB set). The advantage of maintaining the GP symbol is that, for the received terminal device, when the received terminal device performs the transmitting-receiving conversion on the GP symbol outside the COT of the first terminal device, the signal transmitted on the GP symbol inside the COT cannot be received, so that the first terminal device transmits the effective information on the GP symbol inside the COT, and the received terminal device cannot successfully receive the effective information. Thus, to guarantee performance, the GP symbol still maintains its power, and likewise, to maintain the continuity of the COT, the GP symbol may further constitute a shortened GAP time unit and CPE. The advantage of using AGC symbols is that the AGC channels of the respective first resource sets are independent of each other when the channel access procedure is performed on the different first resource block sets. The use of AGC symbols within the COT to transmit effective information is not affected by AGC symbols outside the COT.

Alternatively, assuming that the directions of data transmission of the first slot and the next slot of the first slot are consistent, that is, the first terminal device sends data in the first slot and the next slot of the first slot, or the first terminal device receives data in the first slot and the next slot of the first slot, the GP symbol at the tail of the first slot may be used to transmit the PSSCH in the first slot. I.e., the symbol actually used to transmit the PSSCH, includes symbol 13 (case 2-2).

Fig. 7 (c) shows a scenario in which resources corresponding to the GP symbol (symbol 10) and the AGC symbol (symbol 11) are used for transmitting data, so that symbols 1 to 12 can be used for the first terminal device to transmit data (case 1-1). At this point, symbol 11 and symbol 12 are still different data to be transmitted, and symbol 11 may be used for rate matching. I.e. the PSSCH rate-matched symbols include PSSCH symbols, GP symbols, AGC symbols, PSFCH symbols. The AGC symbols are not replicas of the PSFCH symbols, but rather are data that is different from the PSFCH symbols.

Alternatively, assuming that the directions of data transmission of the first slot and the next slot of the first slot are consistent, that is, the first terminal device sends data in the first slot and the next slot of the first slot, or the first terminal device receives data in the first slot and the next slot of the first slot, the GP symbol at the tail of the first slot may be used to transmit the PSSCH in the first slot. I.e., the symbols actually used to transmit the PSSCH, include symbol 13 (cases 1-2).

Fig. 7 (d) shows a scenario in which resources corresponding to GP symbol (symbol 10) are used for transmitting data (case 4-1), so that symbols 1-10 and symbol 12 are used for the first terminal device to transmit data, symbol 11 and symbol 12 transmit the same data, and symbol 11 is not used for rate matching. I.e. the PSSCH rate-matched symbols include PSSCH symbols, GP symbols, PSFCH symbols. The AGC still retains its function, i.e., the AGC symbol is a replica of the PSFCH symbol.

Alternatively, assuming that the directions of data transmission of the first slot and the next slot of the first slot are consistent, that is, the first terminal device sends data in the first slot and the next slot of the first slot, or the first terminal device receives data in the first slot and the next slot of the first slot, the GP symbol at the tail of the first slot may be used to transmit the PSSCH in the first slot. I.e. the symbols actually used for transmitting the PSSCH, comprise symbol 13. (case 4-2)

Fig. 8 shows a scenario in which resources (symbol 12) included in a PSFCH symbol are used for data transmission according to an embodiment of the present application after CPE is employed.

The frequency domain resource of the second resource used for transmitting data is a frequency domain resource corresponding to the PSSCH symbol (a frequency domain resource occupied by PSSCH transmission in the COT), and the time domain resource of the second resource may further include at least one of the following in addition to the PSSCH resource and the resource included in the PSFCH symbol described above:

GAP time unit (time interval between PSSCH symbol and CPE symbol), CPE time unit, AGC symbol (previous symbol of PSFCH symbol), GP symbol (GP symbol of slot end), wherein the sum of the lengths of GAP time unit and CPE time unit is the length of one symbol in the first slot.

Exemplary: the time domain resources of the second resource may further comprise at least one of:

case 1-1: PSSCH symbols, PSFCH symbols.

Cases 1-2: PSSCH symbol, PSFCH symbol, GP symbol (GP symbol at the end of the slot).

Case 2-1: PSSCH symbols, PSFCH symbols, AGC symbols.

Case 2-1: PSSCH symbols, PSFCH symbols, AGC symbols, GP symbols (GP symbols at the end of the slot).

Case 3-1: PSSCH symbols, PSFCH symbols, CPE time units.

Case 3-2: PSSCH symbols, PSFCH symbols, CPE time units, GP symbols (GP symbol at the end of the slot).

Case 4-1: PSSCH symbols, PSFCH symbols, GAP time units.

Case 4-2: PSSCH symbols, PSFCH symbols, GAP time units, GP symbols (GP symbol at the end of the slot).

Case 5-1: PSSCH symbols, PSFCH symbols, CPE time units, GAP time units.

Case 5-2: PSSCH symbols, PSFCH symbols, CPE time units, GAP time units, GP symbols (GP symbols at the end of the slot).

Case 6-1: PSSCH symbols, PSFCH symbols, GAP time units, AGC symbols.

Case 6-2: PSSCH symbols, PSFCH symbols, GAP time units, AGC symbols, GP symbols (GP symbols at the end of the slot).

Case 7-1: PSSCH symbols, PSFCH symbols, CPE time units, AGC symbols.

Case 7-2: PSSCH symbols, PSFCH symbols, CPE time units, AGC symbols, GP symbols (GP symbols at the tail of the slot).

Case 8-1: PSSCH symbols, PSFCH symbols, GAP time units, CPE time units, AGC symbols.

Case 8-2: PSSCH symbols, PSFCH symbols, GAP time units, CPE time units, AGC symbols, GP symbols (GP symbols at the end of the slot).

Alternatively, when one resource pool includes at least two RB sets, the time domain resource for transmitting data does not include GAP time units or does not include GAP time units and AGC symbols. This is to avoid that when the terminal device receives data in the resource pool, the information on the two RBs set affects each other, for example, the terminal device receives data in the first slot of the RB set1, receives data in the first slot of the RB set2, and sends PSFCH, and a half duplex problem occurs at this time. If the transmission directions in the first time slot on the two RBs set are identical, the time domain resource used for transmitting data may include a GAP time unit.

Alternatively, when a resource pool includes one RB set, the time domain resource for transmitting data may include the original GAP time unit or AGC symbol.

The specific scene is as follows:

the scenario of fig. 8 (a) is: the data transmission symbols of the PSSCH include PSSCH symbols, PSFCH symbols (case 1-1). The PSSCH symbol is a symbol configured to transmit the PSSCH, and the PSFCH symbol is configured to transmit the symbol of the PSFCH but is actually used to transmit the PSSCH. I.e., rate matched symbols of the PSSCH, include PSSCH symbol number and PSFCH symbol. The reason why the AGC symbols are not used for transmitting the effective data is that when the terminal device uses the same AGC symbol and performs frequency division multiplexing (or one resource pool includes at least two RBs set), performing AGC on the AGC symbols outside the COT affects the reception of information transmitted on the same symbol within the COT. The reason why the GAP time unit is not used for transmitting valid data is that when the terminal device uses the same GAP time unit and performs frequency division multiplexing (or one resource pool includes at least two RB sets), the transmission/reception conversion on the GAP time unit outside the COT affects the reception of the information transmitted on the GAP time unit inside the COT.

In fig. 8 (a), only PSFCH symbols are used for transmitting data. AGC symbols are replicas of PSFCH symbols, CPE time units (tail of symbol 10, or understood as part of the time domain resources of the tail of symbol 10) replicate part of the AGC symbols (part of the time domain resources of the head of the AGC symbols), and GAP time units do not transmit any signals. Symbols actually used for transmitting data (rate matching) include: symbol 1-symbol 9 and symbol 12.

Alternatively, assuming that the first slot and the direction of data transmission of the next slot of the first slot are identical, i.e., the first terminal device transmits data in the first slot and the next slot of the first slot, or the first terminal device receives data in the first slot and the next slot of the first slot, the GP symbol at the tail of the first slot may be used to transmit the PSSCH in the first slot, i.e., the symbol actually used to transmit the PSSCH includes symbol 13 (case 1-2).

The scenario of fig. 8 (b) is: the data transmission symbols of the PSSCH include PSSCH symbols, AGC symbols of PSFCH symbols (a symbol preceding the PSFCH symbols), PSFCH symbols. The PSSCH symbol is a symbol configured to transmit the PSSCH, and the PSFCH symbol is configured to transmit the symbol of the PSFCH but is actually used to transmit the PSSCH. The AGC symbols of the PSFCH symbols are not replicas of the PSFCH symbols, but rather are symbols for rate matching. I.e., rate matched symbols of the PSSCH, include PSSCH symbols, AGC symbols of the PSFCH symbols (symbols preceding the PSFCH symbols), and PSFCH symbols. The reason why the GAP time unit symbol is not used to transmit the effective information is that when the terminal device uses the same GAP time unit, and when the terminal device performs frequency division multiplexing (or one resource pool includes at least two RB sets), the receiving and transmitting conversion on the GAP time unit outside the COT affects the receiving of the information transmitted on the same symbol in the COT. The reason for using AGC symbols to transmit valid data is that the AGC channels on different RBs set are independent and do not affect each other.

In fig. 8 (b), the PSFCH symbol and the AGC symbol (symbol 11) are used to transmit data (case 2-1). The CPE time unit duplicates the data transmitted in part of the AGC symbol. The symbols actually used for transmitting data (rate matching) include: symbol 1-symbol 9, symbol 11, and symbol 12.

Alternatively, assuming that the direction of data transmission of the first slot and the next slot of the first slot is identical, GP symbols at the tail of the first slot may be used to transmit PSSCH in the first slot. I.e., the symbols actually used to transmit the PSSCH include symbol 13 (case 2-2).

The scenario of fig. 8 (c) is: the data transmission symbols of the PSSCH include PSSCH symbols, PSFCH symbols, CPE time units. Where PSSCH symbols are symbols configured for transmission of PSSCH, PSFCH symbols are configured for transmission of PSFCH symbols but are actually used for transmission of PSSCH, the CPE time units carry significant bit information, i.e., rate matched symbols of PSSCH include PSSCH symbols, CPE time units, PSFCH symbols. The reason for not using AGC symbols to transmit valid data is that when the terminal device uses the same AGC symbol (or one resource pool includes at least two RBs set), performing AGC on the AGC symbol outside the COT may affect the reception of information transmitted on the same symbol within the COT. The reason why the GAP time unit is not used to transmit the effective information is that when the terminal device uses the same GAP time unit and performs frequency division multiplexing (or one resource pool includes at least two RB sets), the transmission/reception conversion on the GAP time unit outside the COT affects the reception of the information transmitted on the GAP time unit inside the COT.

In fig. 8 (c), the PSFCH symbol and CPE time unit are used to transmit data (case 3-1). The AGC symbols are replicas of the PSFCH symbols. Symbols actually used for transmitting data (rate matching) include: symbol 1-symbol 9, CPE time unit and symbol 12.

Alternatively, assuming that the direction of data transmission of the first slot and the next slot of the first slot is identical, GP symbols at the tail of the first slot may be used to transmit PSSCH in the first slot. I.e., the symbols actually used to transmit the PSSCH include symbol 13 (case 3-2).

The scenario of fig. 8 (d) is: the data transmission symbols of the PSSCH include PSSCH symbols, PSFCH symbols, and GAP time units. Where the PSSCH symbol is a symbol configured for transmitting the PSSCH, the PSFCH symbol is a symbol configured for transmitting the PSFCH but actually used for transmitting the PSSCH, the GAP time unit carries significant bit information, i.e., the rate matched symbol of the PSSCH includes the PSSCH symbol, the GAP time unit, and the PSFCH symbol. The reason for not using AGC symbols to transmit valid data is that when the terminal device uses the same AGC symbol for frequency division multiplexing (or one resource pool includes at least two RBs sets), performing AGC on the AGC symbols outside the COT affects the reception of information transmitted on the same symbol within the COT.

In fig. 8 (d), the PSFCH symbol and GAP time unit are used to transmit data (case 4-1). The AGC symbol is a duplicate of the PSFCH symbol and the CPE time unit duplicates a portion of the AGC symbol. Symbols actually used for transmitting data (rate matching) include: symbol 1-symbol 9, GAP time unit, and symbol 12.

Alternatively, assuming that the direction of data transmission of the first slot and the next slot of the first slot is identical, GP symbols at the tail of the first slot may be used to transmit PSSCH in the first slot. I.e. the symbols actually used for transmitting the PSSCH include symbol 13. (case 4-2)

The scenario of fig. 8 (e) is: the data transmission symbols of the PSSCH include PSSCH symbols, PSFCH symbols, CPE time units, and GAP time units. Where the PSSCH symbol is a symbol configured for transmission of PSSCH and the PSFCH symbol is a symbol configured for transmission of PSFCH but actually used for transmission of PSSCH, the CPE time unit and the GAP time unit carry significant bit information, i.e., the rate-matched symbols of the PSSCH include PSSCH symbols, CPE time unit, GAP time unit, PSFCH symbols. The reason for not using AGC symbols to transmit valid data is that when the terminal device uses the same AGC symbol (or one resource pool includes at least two RBs set), performing AGC on the AGC symbol outside the COT may affect the reception of information transmitted on the same symbol within the COT.

In fig. 8 (e), PSFCH symbols, GAP time units, CPE time units are used to transmit data. Duplication of AGC symbol PSFCH symbol. Symbols actually used for transmitting data (rate matching) include: symbol 1-symbol 10 and symbol 12, where symbol 10 includes a GAP time unit and a CPE time unit (case 5-1).

Alternatively, assuming that the direction of data transmission of the first slot and the next slot of the first slot is identical, GP symbols at the tail of the first slot may be used to transmit PSSCH in the first slot. I.e., the symbols actually used to transmit the PSSCH include symbol 13 (case 5-2).

The scenario of fig. 8 (f) is: the data transmission symbols of the PSSCH include PSSCH symbols, PSFCH symbols, GAP time units, and AGC symbols of the PSFCH symbols (a symbol preceding the PSFCH symbols). Here, the PSSCH symbol is a symbol configured to transmit the PSSCH, the PSFCH symbol is a symbol configured to transmit the PSFCH but actually used to transmit the PSSCH, the AGC symbol of the PSFCH symbol is not a duplicate of the PSFCH symbol, and the GAP time unit carries significant bit information, that is, the rate-matched symbol of the PSSCH includes the PSSCH symbol, the GAP time unit, the PSFCH symbol, and the AGC symbol of the PSFCH symbol (the previous symbol of the PSFCH symbol).

In fig. 8 (f), the PSFCH symbol, GAP time unit, and AGC symbol of the PSFCH symbol (symbol preceding the PSFCH symbol) are used for transmitting data. The CPE time unit replicates part of the AGC symbols, the symbols actually used to transmit data (rate matching) include: symbol 1-symbol 9, GAP time unit, symbol 11, symbol 12 (case 6-1).

Alternatively, assuming that the direction of data transmission of the first slot and the next slot of the first slot is identical, GP symbols at the tail of the first slot may be used to transmit PSSCH in the first slot. I.e., the symbols actually used to transmit the PSSCH include symbol 13 (case 6-2).

The scenario of fig. 8 (g) is: the data transmission symbols of the PSSCH include PSSCH symbols, PSFCH symbols, CPE time units, and AGC symbols of the PSFCH symbols (a symbol preceding the PSFCH symbols). Where the PSSCH symbol is a symbol configured for transmission of the PSSCH and the PSFCH symbol is a symbol configured for transmission of the PSFCH but actually used for transmission of the PSSCH, the AGC symbol of the PSFCH symbol is not a duplicate of the PSFCH symbol, the CPE time unit carries significant bit information, i.e., the rate-matched symbols of the PSSCH include the PSSCH symbol, the CPE time unit, the PSFCH symbol and the AGC symbol of the PSFCH symbol (the preceding symbol of the PSFCH symbol).

In fig. 8 (g), PSFCH symbols, CPE time units, and AGC symbols are used to transmit data. Symbols actually used for transmitting data (rate matching) include: symbol 1-symbol 9, CPE time unit, symbol 11, and symbol 12 (case 7-1).

Alternatively, assuming that the direction of data transmission of the first slot and the next slot of the first slot is identical, GP symbols at the tail of the first slot may be used to transmit PSSCH in the first slot. I.e., the symbols actually used to transmit the PSSCH include symbol 13 (case 7-2).

The scenario of fig. 8 (h) is: the data transmission symbols of the PSSCH include PSSCH symbols, PSFCH symbols, GAP time units, CPE time units, and AGC symbols of the PSFCH symbols (the previous symbol of the PSFCH symbols). Where the PSSCH symbol is a symbol configured for transmission of the PSSCH, the PSFCH symbol is a symbol configured for transmission of the PSFCH but actually used for transmission of the PSSCH, the AGC symbol of the PSFCH symbol is not a duplicate of the PSFCH symbol, and the GAP time units and CPE time units carry significant bit information, i.e., the rate matched symbols of the PSSCH include the PSSCH symbol, the GAP time units, the CPE time units, the PSFCH symbol, and the AGC symbol of the PSFCH symbol (the preceding symbol of the PSFCH symbol).

In fig. 8 (h), PSFCH symbols, GAP time units, CPE time units, and AGC symbols are used to transmit data, and the symbols actually used to transmit data (rate matching) include: symbol 1-symbol 12, where symbol 10 includes a GAP time unit and a CPE time unit (case 8-1).

Alternatively, assuming that the direction of data transmission of the first slot and the next slot of the first slot is identical, GP symbols at the tail of the first slot may be used to transmit PSSCH in the first slot. I.e., the symbols actually used to transmit the PSSCH include symbol 13 (case 8-2).

For the ECP scenario, since the design of the last four symbols is identical to that of the NCP scenario, the descriptions of fig. 7 and fig. 8 can be referred to for specific use of the resources when transmitting data, which will not be described here again.

It should be understood that the descriptions of the resources available for data transmission of fig. 7 and 8 are given only schematically. In a specific scenario, it is possible that the use of certain resources may affect the reception of data in other frequency ranges. For example, the resource pool includes two or more first resource block sets, and the first terminal device only obtains the channel access time on the first resource block set 1 (i.e. successfully accesses the first resource block set 1) through LBT (channel access procedure). Then it is assumed that the first terminal device transmits data to the second terminal device in the first time slot, if the third terminal device uses the first set of resource blocks 2 in the resource pool to transmit data to the second terminal device also in the first time slot. At this time, if the first terminal device uses the AGC symbol or the GAP time unit (may also be referred to as the GP symbol when there is no CPE time unit) to transmit data, and the third terminal device does not use the AGC symbol or the GAP time unit to transmit data. The AGC symbol and GAP time unit on the second RB set may affect the reception of data by the second terminal device on the corresponding symbol of the first RB set.

In the embodiment of the application, before the first terminal device transmits the target information on the first resource, the first terminal device sends first indication information to the second terminal device, where the first indication information is used to instruct the second terminal device to send second data to the first terminal device on the second resource; or the first terminal equipment sends second indication information to the second terminal equipment, wherein the second indication information is used for indicating the second terminal equipment to send second feedback information to the first terminal equipment on the first resource. Optionally, the first terminal device sends second indication information and identification information to the second terminal device, where the identification information includes at least one of source identification information, destination identification information, and transmission type. The identification information is used for the second terminal device to determine that it transmits second feedback information on the first resource.

Or before the first terminal device transmits the target information on the first resource, the first terminal device sends fourth indication information to the second terminal device, where the fourth indication information is used to instruct the first terminal device to send the first feedback information on the first resource, so that the second terminal device can receive the corresponding feedback information on the first resource.

Optionally, the first terminal device sends fifth indication information, where the fifth indication information is used to indicate that the first resource is used to transmit the first feedback information or the second feedback information. The first feedback information is feedback information sent by the first terminal equipment, and the second feedback information is feedback information received by the first terminal equipment.

When the first terminal device receives the second data on the second resource including the first resource or receives the second feedback information on the first resource, the first terminal device may send indication information to the second terminal device, indicating that the first resource of the second terminal device is available, so that the second terminal device may send the second data on the second resource or send the second feedback information on the first resource according to the indication information of the first terminal device, and the second terminal device may be a terminal device sharing the COT of the first terminal device to use the first time slot.

The first indication information may also be understood as information for indicating that the first terminal device shares a time-frequency resource with the second terminal device, i.e. the first terminal device indicates the time-frequency resource with the first indication information, which is used for transmission by the second terminal device. The first terminal device indicates the time-frequency resource, meaning that the second terminal device is instructed to transmit data using the time-frequency resource. I.e. the first indication information is used to instruct the second terminal device to send the second data to the first terminal device on the second resource. Alternatively, the first indication information may be COT indication information. Alternatively, the first indication information may be carried in the first-stage SCI, the second-stage SCI, the MAC CE, and the PC5 RRC.

Alternatively, the second indication information may be a field indicating time-frequency resources for transmitting the feedback information. Alternatively, the second indication information may be 1 bit, where the 1 bit indicates that the first terminal device sends the first feedback information to the second terminal device, or the first terminal device sends the first feedback information. Optionally, the second indication information is a field indicating a time-frequency resource for transmitting the feedback information and 1 bit, where the 1 bit indicates the first terminal device to send the first feedback information to the second terminal device, or the first terminal device sends the first feedback information. Alternatively, the second indication information may be COT indication information. Alternatively, the second indication information may be carried in the first-stage SCI, the second-stage SCI, the MAC CE, and the PC5 RRC.

In the embodiment of the application, before the first terminal device transmits the target information on the first resource, the first terminal device determines that the first resource is available according to second information, where the second information includes at least one of the following: the method comprises the steps of determining a transmission type of third data, a feedback type of the third data HARQ, an energy measurement value associated with the third data and whether the first terminal device is a target terminal device of the third data, wherein the third data is data transmitted on a second time slot, and the second time slot is at least one time slot determined according to feedback timing and the first time slot.

The third data is broadly referred to herein as data transmitted in the second slot, and is not limited to a specific data.

Before the first terminal device uses the first resource, the first terminal device needs to determine that the first resource is available, so that data can be transmitted or feedback information can be transmitted by using the first resource according to the description.

Specifically, the first terminal device determines that the first resource is available according to the second information, including: when the second information meets a preset condition, the first terminal equipment determines that the first resource is available, and the preset condition comprises at least one of the following: the transmission type of the third data is broadcast; the transmission type of the third data is unicast or multicast and HARQ feedback is disabled; the energy measurement value associated with the third data is smaller than or equal to a preset threshold value; the first terminal device is not the target terminal device of the third data.

Correspondingly, the first terminal device may determine that the first resource is available according to a second preset condition, where the second preset condition includes at least one of the following: the transmission type of the third data is unicast or multicast and HARQ feedback is enabled; the energy measurement value associated with the third data is greater than or equal to a preset threshold; the first terminal device is a target terminal device of the third data.

The following describes a specific manner in which the present application determines that the first resource is available.

The second slot is at least one slot determined according to the feedback timing and the first slot, and it is understood that the terminal device transmits the PSFCH in at least K (feedback timing) slots including the first slot of the PSFCH resource after receiving the last slot (first slot) of the PSSCH. It is also understood that the second time slot is the first time slot including the PSFCH resource at an interval feedback timing after the first time slot. I.e. the first time slot is time slot n, the second time slot is n+k and the first time slot including PSFCH resources in time slots after n+k, where K is feedback timing and K is a positive integer. Alternatively, k=2 or 3. Optional k=1. A smaller value of K may be used to reduce latency.

According to the above-described constraint of feedback timing, a first time slot corresponds to more than one second time slot, which may be referred to as a second set of time slots. The first terminal device determines whether the PSFCH resource corresponding to the PSCCH is used according to the detection result of the PSCCH (the detection result of the SCI, which may also be understood as the detection result of the SCI information) in the second time slot set associated with the first time slot. Wherein, PSFCH resources corresponding to PSCCH are PSFCH resources associated with PSSCH resources scheduled by PSCCH. The time-frequency location of the PSFCH resource may be determined from the time-frequency location of the PSSCH resource. And determining the set of the frequency domain position and/or the code domain position of the PSFCH resource according to the frequency domain initial sub-channel of the PSSCH resource or the frequency domain sub-channel occupied by the PSSCH resource. Optionally, the frequency domain resources and/or code domain resources in the set of frequency domain locations and/or code domain locations of the PSFCH resources are determined according to the source target identity and/or group identity indicated in the PSCCH.

Optionally, the first terminal device determines that the PSFCH resources in the first time slot are not used, or that the PSFCH resources in the first time slot are partially used. Optionally, the first terminal device determines that the PSFCH resources in the COT in the first slot are not used, or that the PSFCH resources in the COT in the first slot are partially used.

Optionally, the specific manner of determining that the first resource is available may include the following steps:

the first terminal device determines an available set of resources from which to select a first resource. An exemplary method may include at least one of the following steps:

step 1: determining a full set of PSFCH resources included in a PSFCH symbol

The PSFCH symbol includes one or more frequency domain resource elements therein. The frequency domain resource unit may be a subchannel, an interlace, or a PRB. Taking interleaving as an example. The PSFCH symbol comprises S1 frequency domain and code domain resources, and S1 is a positive integer.

Step 2: the set of PSFCH resources used in the PSFCH symbol is determined according to the following preset conditions.

I.e. the first slot in which the PSFCH symbol is located or the second slot associated with the PSFCH symbol, the second slot being a slot determined from the first slot and the feedback timing between the PSSCH and the PSFCH. The second time slot may be more than one, referred to as a second set of time slots. The first terminal device may determine PSFCH resources used in the PSFCH symbol based on the second information in the second set of slots. The PSFCH resource used is a resource of HARQ of transmission type 1. I.e. the PSFCH resource is determined from the time-frequency location of the PSSCH resource. The procedure for determining that the PSFCH is used according to the second information is as follows:

The first terminal device may determine that the PSFCH resource is available according to a second preset condition, where the second preset condition includes at least one of: the transmission type of the third data is unicast or multicast and HARQ feedback is enabled; the energy measured value associated with the third data is greater than or equal to a preset threshold; the first terminal device is a target terminal device of the third data.

Step 3: and (3) excluding the used PSFCH resources from the whole set obtained in the step (1), wherein the rest resources are available resource sets.

The set of PSFCH resources that are used as determined according to step 2 is denoted S2. PSFCH resources included in the set S1 are excluded from PSFCH resources included in the set S2, and the remaining PSFCH resources are the set of available PSFCH resources, namely S3.

Step 4: a first resource is selected from a set of available resources.

The first terminal device selects a first resource in S3 determined in step 3. The first resource may be part or all of the resources in S3.

The time slots associated with the first time slot by the feedback timing may include time slots within and outside the COT. Since the start position of the COT depends on the point of time when the channel access procedure is successful, the second time slot associated with the first time slot may be located at or outside the COT. In some embodiments, the second time slot used to determine that the first resource is available includes only time slots within the COT. It is understood that only data transmissions within the COT may be fed back in the first time slot. This also means that the second time slots included in the second time slot set are all located within the COT, i.e. the sub-channels in the second time slot set have an association with the PSFCH resources in the PSFCH symbol. The time slots outside the COT, which are determined according to the first time slot and the feedback timing, are no longer associated with PSFCH resources in the PSFCH symbol.

Fig. 9 shows a scenario in which a first terminal device obtains a COT, where the COT of the first terminal device includes a time slot n+1, a time slot n+2, a time slot n+3, and a time slot n+4, where the time slot n+3 is a first time slot, and the time slot includes a feedback resource b corresponding to a PSFCH symbol, and the time slot determined by feedback timing has a time slot n and a time slot n+1. The first terminal device does not send or receive data on the time slot n, and the first terminal device does not send or receive feedback by using the feedback resource b, and the first terminal device may not share the feedback resource in the COT to other terminal devices for use (i.e., the time slot associated with the first time slot according to the feedback timing is not in the COT, and HARQ of the time slot cannot be fed back in the first time slot). When judging whether the first resource is available, only the time slot in the COT in the time slot associated with the first time slot needs to be considered, and the feedback condition of the data transmitted in the time slot n+1 is considered.

In some embodiments, when the first terminal device transmits data in the time slot n+1, and the time when the first terminal device LBT (channel access) is successful is no later than the start time of the time slot n+1, the first terminal device may know what data (third data) to transmit using the time slot n+1, so as to determine whether the resource corresponding to the third data in the time slot n+1 in the feedback resource b is used. In this case, the second information may be specific information of the third data transmission or may also be SCI information to be transmitted by the first terminal device (i.e. the second information may be from information to be transmitted or transmitted information).

For example, the data sent by the first terminal device in the time slot n+1 is sent by using broadcasting, and since the broadcasting data does not need feedback, the first terminal device can determine that the feedback resource corresponding to the time slot n+1 is available.

For another example, the data sent by the first terminal device in the time slot n+1 is sent by unicast or multicast, and the HARQ feedback is disabled, then the first terminal device may determine that the feedback resource corresponding to the time slot n+1 is available.

In other embodiments, the first terminal device is not a terminal device that transmits data in the time slot n+1, and the first terminal device may detect SCI information of the time slot n+1 and determine whether the feedback resource corresponding to the time slot n+1 is used according to the SCI information. In this case, SCI information is the second information described above.

For example, the first terminal device detects SCI information in the time slot n+1, and indicates that data transmitted in the time slot n+1 is sent in a broadcast manner, for example, a broadcast type field (or referred to as a transmission type field) in the SCI information indicates that the data is broadcast in use (a casttypeindicator indicates broadcast), so that the first terminal device may determine that feedback is not required for the data transmitted in the time slot n+1, and the first terminal device may determine that feedback resources corresponding to the data scheduled by the SCI information detected in the time slot n+1 are available.

For another example, the first terminal device detects SCI information in the time slot n+1, and the SCI information indicates that HARQ feedback of data sent in the time slot is disabled, specifically, an HARQ feedback enable/disable field (HARQ feedbackenabled/disable) indicates that HARQ feedback is disabled, so that the first terminal device may determine that data transmitted in the time slot n+1 does not need feedback, and feedback resources corresponding to data scheduled by SCI information detected in the time slot n+1 are available. At this time, the first terminal device is unicast or multicast according to the transmission type of the data in the time slot n+1 obtained by the broadcast type indication field (casttypeindicator) in the SCI.

For another example, if the first terminal device detects SCI information in the time slot n+1, but the energy measurement value associated with the SCI information is less than or equal to the preset threshold, the first terminal device may determine that feedback resources corresponding to the data scheduled by the SCI information detected in the time slot n+1 are available. The energy measurement may be a received signal energy indication (received signal strength indicator, RSSI), a reference signal received power (reference signal received power, RSRP), a signal to interference plus noise ratio (signal to interference plus noise ratio, SINR), a signal to noise ratio (signal to noise ratio, SNR), etc.

The definition of RSSI is a linear average of the total received power (in W) observed in the subchannels configured in the OFDM symbols of the slots configured for PSCCH and PSSCH, starting with OFDM 2.

The RSRP measurement may be based on DMRS of the PSCCH scheduled by the SCI or based on the PSCCH where the SCI is located.

PSCCH reference signal received power (PSCCH-RSRP) is defined as the linear average of the power contributions (in W) of the resource elements carrying the demodulation reference signals associated with the physical side link control channel (PSCCH).

The PSSCH reference signal received power (PSSCH-RSRP) is defined as the linear average of the power distribution (in W) of the resource elements of the antenna ports carrying the demodulation reference signal associated with the PSSCH, summed over the antenna ports.

The preset threshold may be configured or preconfigured by the network device. In particular, the threshold value may be determined based on a combination of a priority value included in the detected SCI information and a priority value N, and the detected SCI priority value in the SCI may be the priority included in the first level SCI (SCI-1) described above. The priority value N may be preset, predefined or configured by the network device or preconfigured. The value feedback of N is positive integer 1 to 8. Alternatively, N is equal to 1. At this time, the threshold value can be made larger, so that the feedback resource can be ensured to be utilized for transmitting data or feedback information.

Alternatively, the threshold may be determined according to a priority value included in the detected SCI information and a priority value of data to be transmitted by the first terminal device. Alternatively, the threshold may be determined based on a priority value included in the detected SCI information and a priority value used by the first terminal device for initial COT. When the range of priority values used by the first terminal device initial COT is 1,2,3,4, the priority values 1,2,3,4 may correspond to the priority values {1,2}, {3,4}, {5,6}, and {7,8}, respectively, of the data.

Optionally, the first terminal device measures energy in time slot n+1. The measured energy may be RSSI, SINR or SNR, etc. The RSSI measurement may be based on all symbol measurements included in the slot n+1 (the time domain range is one slot, the frequency domain range is the frequency domain range of the resource pool), or based on all time-frequency resource measurements included in the COT in the slot n+1 (the time domain range is one slot; the frequency domain range is the frequency domain range corresponding to the COT). Alternatively, the measured value of RSSI may be based on the symbol in the slot n+1 in the resource pool configured to transmit the PSSCH and PSCCH (the frequency domain range is the resource pool), or based on the symbol in the slot n+1 in the COT configured to transmit the PSSCH and PSCCH (the frequency domain range is the frequency domain range corresponding to the COT).

Further, the first terminal device may further decode the SCI information, and when it is determined that the target terminal device of the SCI information is not the first terminal device, and/or the energy measurement associated with the SCI information is less than or equal to a preset threshold, the first terminal device determines that a feedback resource corresponding to the data scheduled by the SCI in the time slot n+1 is available. The energy measurement may be RSSI, RSSP, SNR, SINR, etc. That is, the target terminal device sharing information transmitted by the terminal device of the COT of the first terminal device needs to be the first terminal device. When the SCI-associated energy measurement is low, it can be considered that the interference generated by the SCI on the first terminal device is low, so that the transmission performance of the first terminal device is not affected.

Optionally, when the first terminal device does not detect SCI information in the time slot n+1, the first terminal device may also determine that a feedback resource corresponding to the time slot n+1 is available.

In other embodiments, the first terminal device transmits information on a second time slot for determining that the second time slot in which the first resource is available includes time slots within and outside of the COT. That is, the time slots satisfying the first time slot and the feedback timing are both second time slots, and the time slots included in the second time slot set may be located in the COT or may be located outside the COT. Still taking fig. 9 as an example, the feedback timing between PSSCH to PSFCH is 2 slots. If the first terminal device transmits data on time slot n, the target terminal device of the first terminal device receiving data on time slot n needs to transmit feedback information on the feedback resource of time slot n+3, which is allowed by the target terminal device to use the feedback resource within the COT of the first terminal device.

Alternatively, the PSFCH corresponding to the data in the second slot outside the COT may be fed back within the COT. Even if the target terminal device for the data transmission is not the second terminal device. I.e. the second information in the second time slot outside the COT can determine that the corresponding PSFCH resource is an available resource or an unavailable resource according to the preset condition.

Optionally, if the target terminal device for data transmission in the second timeslot outside the COT is not the first terminal device (i.e., the target terminal device and the first terminal device have no transceiving relationship), the PSFCH corresponding to the data may not be transmitted in the COT. The PSFCH resource corresponding to the data is an available resource.

Optionally, if the first terminal device receives data in the second time slot outside the COT, the first terminal device needs to feed back corresponding HARQ information on the PSFCH resource of the first time slot.

If the first terminal device receives data in the time slot n, the first terminal device needs to feedback the PSFCH corresponding to the data in the time slot n on the feedback resource b of the time slot n+3, and the first terminal device still needs to consider the data transmission condition of the time slot n to determine whether the first resource is available. I.e. the first terminal device needs to consider both intra-COT and extra-COT time slots in the time slots associated with the first time slot when judging whether the first resource is available.

In the specific judging process, the first terminal device needs to judge the data transmission conditions on the time slot n and the time slot n+1 respectively, and the process of determining whether the feedback resource corresponding to the time slot n is available according to the data transmission condition of the time slot n is similar to the process of judging whether the feedback resource corresponding to the time slot n+1 is available according to the data transmission condition of the time slot n+1 described in the previous Wen Jie, and the specific process can refer to the related description and is not repeated here.

In the present application, only two timeslots in a timeslot associated with a first timeslot are taken as an example to describe a process of determining whether a first resource is available, in an actual situation, a first terminal device needs to determine whether corresponding feedback resources are available according to the foregoing description by using second information (SCI information or data transmission situation) in all associated timeslots to be considered, so as to obtain an available resource set in the feedback resources of the first timeslot, and then obtain the first resource from the available resource set, where the first resource is used for transmitting data or transmitting feedback.

Alternatively, the first terminal device may send the COT indication information indicating whether the PSFCH resource is included in the preconfigured PSFCH time slot (time slot including the PSFCH resource, i.e., time slot including the PSFCH symbol) within the COT. I.e. indicating whether the preconfigured PSFCH slot within the COT is a real PSFCH slot.

This is because the first terminal device determines whether the PSFCH resource in the COT is used according to the preset condition, and then knows whether the PSFCH resource in the COT is used. Optionally, the first terminal device determines whether the (pre) configured PSFCH symbols in the COT are used for transmitting feedback information or data. The first terminal device may thus indicate in the COT indication information the PSFCH slot actually used for transmitting the feedback information within the COT, which may comprise the PSFCH resource (slot) implicitly indicated by the feedback timing and/or the resource (slot) indicated for transmitting the PSFCH.

Illustratively, the first terminal device includes X preconfigured PSFCH slots within the COT. The first terminal device sends indication information, wherein the indication information is X bits, and the X bits are used for indicating whether X preconfigured PSFCH time slots in COT are real PSFCH time slots or not. For example, X is 4, the indication information is 4 bits, and it is assumed that the indication is "1101" in which 1 indicates that the preconfigured PSFCH slot is a real PSFCH slot and 0 indicates that the preconfigured PSFCH slot is a real PSFCH slot. This means that there are no PSFCH resources in the 1/2/4 th preconfigured slot and PSFCH resources in the 3 rd preconfigured slot of the 4 preconfigured slots within the COT. The meaning of the indications 1 and 0 may also be reversed, 0 indicating that the preconfigured PSFCH slot is a real PSFCH slot, 1 indicating that the preconfigured PSFCH slot is a real PSFCH slot. Without affecting the principles of the embodiments of the present application.

Optionally, when sending data, the first terminal device may send indication information and data, where the indication information is used to indicate that the second resource occupied by the data includes the first resource or does not include the first resource.

Optionally, the frequency domain corresponding to the initial COT of the first terminal device is two RBs set, and the first terminal device determines that none of the resources in the PSFCH symbol in the first slot is used. The resources in the PSFCH symbols on both RBs set are available resources. The resources in both RBs set are used for transmitting data or feedback information. Otherwise, the unused PSFCH resource in one of the RBs sets may cause a COT interrupt. The PSFCH symbol may be a copy of the first symbol of the GAP time unit, assuming that the first terminal device has no information to transmit. Alternatively, assuming that the first terminal device has no information to be transmitted, the PSFCH symbol is a duplicate of the last symbol in the PSSCH symbols. Optionally, the PSFCH AGC symbol is a duplicate of the PSFCH symbol, essentially the last symbol in the PSSCH symbol. Optionally, the CPE time unit is a partial copy of the PSFCH AGC symbol, essentially the last of the PSSCH symbols.

Alternatively, the process of determining whether the first resource is available described in the embodiments of the present application may be extended to a scenario of multiple transmission opportunities. In general, one PSSCH corresponds to one PSFCH transmission opportunity (feedback resource corresponding to one PSFCH symbol), but since PSFCH transmission in an unlicensed spectrum needs to be LBT, PSFCH cannot be transmitted if LBT fails, and configuring multiple PSFCH transmission opportunities can improve the reliability of PSFCH transmission.

Wherein, the multiple transmission opportunities can be enabled or disabled, and the granularity of the enabled or disabled can be a resource pool or an RB set. For example, the first terminal device may be configured or preconfigured by the network device to enable or disable the functionality of multiple transmission opportunities within the resource pool or RB set. Wherein the plurality of transmission opportunities may be fixed or may be configured or preconfigured or predefined for the network device. Illustratively, in view of overhead and reliability, the plurality of transmission opportunities may be 2 transmission opportunities or three transmission opportunities, i.e., one PSSCH transmits a feedback resource or transmission opportunity corresponding to 2 or 3 slots. The number of transmission opportunities or feedback resources may be indicated by a field. This field may be carried in the first level SCI or second level SCI or MAC CE or PC5 RRC.

For a multiple transmission opportunity scenario, when a PSFCH (feedback information) is transmitted in one transmission opportunity, the feedback resources on the PSFCH transmission opportunity to be used may be considered available. In an exemplary embodiment, in the multiple transmission opportunities, the first terminal device determines that the PSFCH resource in a certain transmission opportunity includes ACK or NACK, and in the transmission opportunities to be used, the PSFCH resource corresponding to the PSFCH resource in the one transmission opportunity is an available resource. Accordingly, determining that the PSFCH resource in one transmission opportunity is available may determine whether the PSFCH resource in the one transmission opportunity is available based on whether HARQ information is transmitted among the PSFCH resources corresponding to the PSFCH resource in a transmission opportunity preceding the one transmission opportunity.

Specifically, when the first terminal device determines whether the PSFCH resource in a certain transmission opportunity is available, the first terminal device may blindly check whether feedback information exists in the PSFCH resource in the last transmission opportunity associated with the PSFCH resource. If the HARQ information (NACK or ACK) is detected in the last feedback opportunity, the PSFCH resource in the transmission opportunity is the available resource. If the HARQ information in the last feedback opportunity is detected as Discontinuous Transmission (DTX) (which may also be understood as no ACK or NACK being detected), the PSFCH resource in that transmission opportunity is an unavailable resource.

Illustratively, the second time slot associates multiple PSFCH transmission opportunities according to the feedback timing. For example, the number of PSFCH transmitters would be 2. The second time slot is associated with a first PSFCH transmission opportunity according to the feedback timing, and the second PSFCH transmission opportunity may be a first time slot including PSFCH resources after the second time slot. Optionally, the second time slot is associated with a first PSFCH transmission opportunity according to the feedback timing, and the second PSFCH transmission opportunity may be a next time slot of the second time slot.

Namely, the first terminal equipment receives the third data in the second time slot, and the first terminal equipment sends feedback information corresponding to the third data in the third time slot. The plurality of time slots corresponding to the second time slot and including the transmission opportunity include a first time slot and a third time slot. The third slot is the slot that includes the transmission opportunity immediately preceding the first slot.

And the first terminal equipment determines that the feedback information corresponding to the third data in the third time slot is ACK or NACK, and determines that the corresponding PSFCH resource in the first time slot is an available resource.

And the first terminal equipment determines that the feedback information corresponding to the third data in the third time slot is DTX, and determines that the corresponding PSFCH resource in the first time slot is an unavailable resource.

The first terminal device determines available PSFCH resources in the first time slot according to the situation that PSFCH resources in a plurality of transmission opportunities before the first time slot are used, wherein the situation that the PSFCH resources are used comprises that HARQ is ACK or NACK or DTX, and selects the first resources from the available PSFCH resource sets.

Fig. 10 shows a scenario of multiple transmission opportunities, where the first terminal device LBT (performing a channel access procedure) obtains a COT including a slot n+1, a slot n+2, a slot n+3, a slot n+4, and a slot n+5. The first transmission opportunity of slot n, slot n+1 is at slot n+3 and the second transmission opportunity of slot n, slot n+1 is at slot n+5. The feedback resource in the first transmission opportunity of slot n+1 is at position a of slot n+3, and the feedback resource in the second transmission opportunity is at position a' of slot n+5.

The first time slot is time slot n+5, the second time slot determined according to the first time slot and the feedback timing is time slot n+1, and the third time slot determined according to the second time slot and the second feedback timing is time slot n+3. If the first terminal device determines that there is HARQ feedback for data of slot n+1 (second slot) on the third slot, then resources corresponding to data transmission of the second slot (slot n+1) on the third slot (slot n+3) are used, while resources corresponding to data transmission of the second slot (slot n+1) on the first slot (slot n+5) are available. If the first terminal device determines that there is DTX feedback for data of slot n+1 (second slot) on the third slot, resources corresponding to data transmission of the second slot (slot n+1) on the first slot (slot n+5) are not available.

Fig. 11 illustrates another side-link communication method 1100 provided by an embodiment of the present application, the method including:

s1110, the second terminal device receives the COT indication information from the first terminal device, where the time unit indicated by the COT indication information includes a first slot, and the first slot includes a PSFCH symbol.

In S1110, the COT indication information is sent by the first terminal device, and the first terminal device may obtain the COT from the resource pool through Type 1 LBT, and then send the COT indication information, where the indication information includes a time domain range and a frequency domain range included in the COT, and whether each time slot is shared for use by other terminal devices.

The second terminal device uses the first time slot to transmit information, e.g., the second terminal device may receive information from the first terminal device in the first time slot or the second terminal device may share the COT of the first terminal device to send information to the first terminal device.

S1120, the second terminal device transmits target information on a first resource, wherein the first resource is a resource in a PSFCH symbol, the target information comprises one of first data, second data, first feedback information and second feedback information, the first data is data to be received by the second terminal device on a first time slot, the second data is data to be sent by the second terminal device on the first time slot, the first feedback information is feedback information to be received by the second terminal device, and the second feedback information is feedback information to be sent by the second terminal device.

In the embodiment of the present application, the second terminal device transmits the target information on the first resource, including: in the case that the target information comprises the first data, the second terminal device receives the first data on a second resource, the second resource comprising the first resource; in the case that the target information comprises second data, the second terminal device transmits the second data on a second resource, wherein the second resource comprises the first resource; the second terminal equipment receives the first feedback information on the first resource under the condition that the target information comprises the first feedback information; and the second terminal equipment sends the first feedback information on the first resource under the condition that the target information comprises the second feedback information.

Correspondingly, if the target information comprises first data, the first terminal equipment sends the first data on a second resource, and the second resource comprises the first resource; in the case that the target information comprises second data, the first terminal device receives the second data on a second resource, the second resource comprising the first resource; the method comprises the steps that under the condition that target information comprises first feedback information, first terminal equipment sends the first feedback information on a first resource; in the case where the target information includes second feedback information, the first terminal device receives the second feedback information on the first resource.

It should be appreciated that in the case where the target information includes the first data or the second data, the second resource further includes a resource corresponding to the PSSCH symbol on the first slot.

The target information may include the first feedback information or the second feedback information when a portion of the resources corresponding to the PSFCH symbol has been used for transmitting feedback, i.e., when the portion of the resources included in the PSFCH symbol is valid. The target information may include one of the first data, the second data, the first feedback information, the second feedback information when the resources included in the PSFCH symbol are not used for transmitting feedback, i.e., the resources included in the PSFCH symbol are available (valid) or unoccupied.

The method 600 already described in the embodiment shown in fig. 6 is used for the validity of the resource portion included in the PSFCH symbol and the resource included in the PSFCH symbol, and specific details may be referred to in the related description of the corresponding embodiment in fig. 6, which is not repeated herein for brevity.

In this embodiment of the present application, the second terminal device transmits, on the first resource, target information according to at least one item of first information, where the first information includes: priority of the first data; priority of the second data; priority of the first feedback information; priority of the second feedback information.

The priority may be carried in SCI-1 in the PSCCH. Whether the four priorities relate to specific data that the second terminal device needs to transmit, for example, whether the first data and the second data relate to whether the second terminal device needs to receive the first data or transmit the second data in the first time slot, and whether the first feedback information and the second feedback information exist also relate to whether the second terminal device needs to have the first feedback information that is not received and the second feedback information that is not successfully transmitted. The specific information to be transmitted by the second terminal device includes which of the above information, and the second terminal device can compare the priority of the specific information to determine the final target information to be transmitted.

Optionally, the second terminal device may further determine priorities of the data (the first data and the second data) and the feedback information (the first feedback information and the second feedback information), determine whether the first resource is used for transmitting the data or transmitting the feedback information, and then determine which feedback information to transmit according to the priorities inside the feedback information. Specific procedures may be described in relation to method 600 and are not repeated here.

In this embodiment of the present application, the second terminal device transmits, on the first resource, target information according to at least one item of first information, where the first information includes: delay information of the first data; delay information of the second data; delay information of the first feedback information; and delay information of the second feedback information.

The second terminal device only uses the priority to determine what kind of target information is transmitted, only uses the time delay information to determine what kind of target information is transmitted, and also uses the combination of the priority and the time delay information to determine what kind of target information is transmitted. Specific steps may be referenced to the description of corresponding steps of method 600.

In the embodiment of the present application, when the first resource is used for receiving the first feedback information and the second terminal device receives the data in the first time slot, the resource used for receiving the first data by the second terminal device includes a resource corresponding to the GAP time unit in the first time slot; or when the first resource is used for sending the second feedback information and the second terminal device sends data in the first time slot, the second terminal device is used for sending the second data to comprise the resource corresponding to the GAP time unit in the first time slot.

GAP time units are time units corresponding to GP symbols in NCP, and are shorter than GP symbols in ECP.

When the first resource is used for transmitting first feedback information and the second terminal equipment transmits data in the first time slot, the first time slot is used for the second terminal equipment to transmit information, and the GAP time unit originally used for the transceiving conversion is used for transmitting data because the transceiving conversion is not involved, so that the resources for data transmission can comprise the GAP time unit besides the resources corresponding to the original PSSCH symbols; when the first resource is used for receiving the second feedback information and the second terminal device receives the data in the first time slot, the first time slot is used for the second terminal device to receive the information, and the GAP time unit originally used for the transceiver conversion is also used for the first terminal device to receive the data. Thereby, the resources for transmitting data in the first time slot are increased, and the data transmission speed is improved.

In an embodiment of the present application, the second resource further includes at least one of: the resources corresponding to the AGC symbols in the first time slot, the resources corresponding to the GAP time units in the first time slot, and the resources corresponding to the CPE time units in the first time slot.

In the case that the target information is the first data or the second data, the second terminal device may further transmit the first data or the second data using at least one of a resource corresponding to the AGC symbol, a resource corresponding to the GAP time unit, and a resource corresponding to the CPE time unit.

For details, reference may be made to the corresponding descriptions of the method 600, fig. 7 and fig. 8, and details are not repeated here.

In this embodiment of the present application, before the second terminal device transmits the target information on the first resource, the method further includes: the second terminal equipment receives first indication information from the first terminal equipment, wherein the first indication information is used for indicating the second terminal equipment to send second data to the first terminal equipment on second resources; or before the second terminal device sends the second feedback information on the first resource, the method further includes: the second terminal device receives second indication information from the first terminal device, wherein the second indication information is used for indicating the second terminal device to send second feedback information to the first terminal device on the first resource.

When the second terminal device transmits second data on a second resource including the first resource or transmits second feedback information on the first resource, the second terminal device may receive indication information from the first terminal device, indicating that the first resource is available to the second terminal device, so that the second terminal device may transmit the second data on the second resource or transmit the second feedback information on the first resource according to the indication information of the first terminal device, and the second terminal device may be a terminal device sharing the COT of the first terminal device to use the first slot.

In this embodiment of the present application, the target information includes second data, and the second terminal device sends third indication information, where the third indication information indicates that the second resource includes the first resource.

I.e. the second terminal device, when transmitting data in the first time slot, indicates whether the resources occupied by the data comprise PSFCH symbols. For example, the third indication information is 1 bit, the value of the third indication information sent by the second terminal device is 1, which indicates that the resources occupied by the data include PSFCH symbols, and the value of the third indication information sent by the second terminal device is 0, which indicates that the resources occupied by the data do not include PSFCH symbols. The opposite is also true, the third indication information is 1 bit, the third indication information sent by the second terminal device takes a value of 0, which indicates that the resources occupied by the data include PSFCH symbols, and the third indication information sent by the second terminal device takes a value of 1, which indicates that the resources occupied by the data do not include PSFCH symbols. The resources occupied by the data include PSFCH symbols, or may be combined with the PSSCH transmission described above using at least one of PSSCH symbols, PSFCH symbols, GAP time units, CPE time units, PSFCH AGC symbols.

Alternatively, the second terminal device may receive indication information indicating whether the preconfigured PSFCH resources included in the COT are actually used for transmitting the PSFCH. It may also be understood as indicating whether the candidate PSFCH resources included within the COT actually include the PSFCH resources. After receiving the indication information, the second terminal device determines that the first resource is available according to the second information, and may still determine whether to use the PSFCH resource in the PSFCH symbol according to the use condition of the PSFCH resource in the PSFCH symbol. For example, the second terminal device receives indication information indicating that one slot in the COT includes the PSFCH resource. When the second terminal device determines that the PSFCH resource in the COT is not used, the partial resource may be used, that is, the partial resource is considered as an available resource.

In this embodiment of the present application, before the second terminal device transmits the target information on the first resource, the method further includes: the second terminal device determines that the first resource is available according to second information, wherein the second information comprises at least one of the following: the transmission type of the third data, the HARQ feedback type of the third data, the energy measurement value associated with the third data, and whether the second terminal device is a target terminal device of the third data, wherein the third data is data transmitted on a second time slot, and the second time slot is at least one time slot determined according to the feedback timing and the first time slot.

In the embodiment of the present application, the second terminal device determines that the first resource is available according to the second information, including: when the second information meets a preset condition, the second terminal equipment determines that the first resource is available, and the preset condition comprises at least one of the following: the transmission type of the third data is broadcast; the transmission type of the third data is unicast or multicast and HARQ feedback is disabled; the energy measurement value associated with the third data is smaller than or equal to a preset threshold value; the second terminal device is not the target terminal device of the third data.

The second terminal device determines whether the feedback resource is needed for the second slot according to the SCI information or the data transmission condition of the second slot related to the feedback resource (the resource included in the PSFCH symbol) of the first slot. The second slot is a slot determined according to the first slot and the feedback timing between the PSSCH to the PSFCH. The second time slot may be more than one.

When the data of the second time slot is broadcast or HARQ feedback is disabled, the second time slot does not need feedback, and the feedback resource corresponding to the second time slot is available, after all the data transmission conditions of the second time slot and SCI information are judged (only the second time slots used by the first terminal device initializing the COT need to be considered), whether the resources included in the PSFCH symbol of the first time slot are fully available or partially available can be determined according to all the second time slots connected with the first time slot through feedback timing, and the first resource is selected from the available resources for transmitting the data or feedback information. For specific details, reference may be made to the relevant description of the method 600, which is not repeated here.

In the method 1100, a first terminal device performing LBT to obtain a COT shares a first slot in the COT to a second terminal device for use, the second terminal device may use a PSSCH resource of the first slot to transmit data with the first terminal device, the second terminal device may determine whether a first resource in resources included in a PSFCH symbol in the first slot is available, and when the first resource is available, the second terminal device may determine a specific usage manner of the first resource, for example, the second terminal device may use the first resource to transmit data or feedback information.

Fig. 12 shows a communication apparatus 1200 provided in an embodiment of the present application. The communication device 1200 comprises an acquisition unit 1210 and a transceiver unit 1220, optionally the communication device 1200 further comprises a determination unit 1230. The communication apparatus 1200 corresponds to the first terminal device in fig. 6, and may include units for performing the method of fig. 6, and each unit in the communication apparatus 1200 and the other operations and/or functions described above are respectively for implementing the corresponding flow of fig. 6.

Specifically, the communication apparatus 1200 includes: an acquiring unit 1210, configured to acquire a channel access time COT, where the COT includes a first slot, and the first slot includes a PSFCH symbol; the transceiver 1220 is configured to transmit, on a first resource, target information, where the first resource is a resource in a PSFCH symbol, and the target information includes one of first data, second data, first feedback information, and second feedback information, where the first data is data to be transmitted by the communication device 1200 on a first time slot, the second data is data to be received by the communication device 1200 on the first time slot, the first feedback information is feedback information to be transmitted by the communication device 1200, and the second feedback information is feedback information to be received by the communication device 1200.

In this embodiment, the acquiring unit 1210 acquires the COT, where the COT includes a first slot, where the first slot includes a PSFCH symbol, and the transceiver unit 1220 transmits the target information using the first resource, thereby reducing the waste of resources included in the PSFCH symbol, and further, when the first resource is a resource included in the PSFCH symbol, that is, when the resource included in the PSFCH symbol is not used at all, the communication apparatus 1200 uses the first resource, so that other terminal devices may not successfully LBT on the resource included in the PSFCH symbol, and the possibility of the COT interruption of the communication apparatus 1200 is reduced. In addition, when the first resource is utilized to transmit data, the data transmission efficiency can be improved; when the feedback information is transmitted using the first resource, the reliability of the communication apparatus 1200 for data transmission can be improved.

In the embodiment of the present application, the target information includes first data or second data, where the transceiver 1220 is specifically configured to: transmitting the first data on a second resource, the second resource comprising the first resource; alternatively, the second data is received on a second resource, the second resource comprising the first resource.

In the embodiment of the present application, the resources included in the PSFCH symbol are available.

In the embodiment of the present application, the resource portion included in the PSFCH symbol is available, and the target information includes one of the first feedback information and the second feedback information.

In this embodiment, when the first resource is used to transmit the first feedback information and the communication device 1200 transmits data in the first time slot, the resource used by the communication device 1200 to transmit the first data includes a resource corresponding to the GAP time unit in the first time slot; alternatively, when the first resource is used to receive the second feedback information and the communication device 1200 receives data in the first time slot, the communication device 1200 is used to receive the second data including the resource corresponding to the GAP time unit in the first time slot.

In this embodiment of the present application, the transceiver 1220 is configured to transmit, on the first resource, the target information according to at least one of the first information, where the first information includes: priority of the first data; priority of the second data; priority of the first feedback information; priority of the second feedback information.

In this embodiment of the present application, the transceiver 1220 is configured to transmit, on the first resource, the target information according to at least one of the first information, where the first information includes: delay information of the first data; delay information of the second data; delay information of the first feedback information; and delay information of the second feedback information.

In an embodiment of the present application, the communication apparatus 1200 further comprises a determining unit 1230 for determining that the first resource is available according to second information, the second information comprising at least one of: the transmission type of the third data, the third data HARQ feedback type, the energy measure associated with the third data, and whether the communication apparatus 1200 is a target terminal device of the third data, wherein the third data is data transmitted on a second time slot, the second time slot being at least one time slot determined according to the feedback timing and the first time slot.

In the embodiment of the present application, the determining unit 1230 is specifically configured to: when the second information meets a preset condition, determining that the first resource is available, wherein the preset condition comprises at least one of the following: the transmission type of the third data is broadcast; the transmission type of the third data is unicast or multicast and HARQ feedback is disabled; the energy measurement value associated with the third data is smaller than or equal to a preset threshold value; the communication device 1200 is not the target communication device 1200 of the third data.

In this embodiment of the present application, the transceiver 1220 is further configured to send, to the second terminal device, first indication information, where the first indication information is used to instruct the second terminal device to send, to the communication apparatus 1200, second data on the second resource; or, the second indication information is sent to the second terminal device, where the second indication information is used to instruct the second terminal device to send the second feedback information to the communication apparatus 1200 on the first resource.

Fig. 13 shows another communication device 1300 provided in an embodiment of the present application, where the communication device 1300 includes a transceiver unit 1310, and optionally, the communication device 1300 further includes a determining unit 1320. The communication apparatus 1300 corresponds to the second terminal device in fig. 11, and may include units for performing the method in fig. 11, and each unit in the communication apparatus 1300 and the other operations and/or functions described above are respectively for implementing the corresponding flow in fig. 11.

Specifically, the communications apparatus 1300 includes a transceiver 1310 configured to receive, from a first terminal device, COT indication information, where a time unit indicated by the COT indication information includes a first time slot, and the first time slot includes a PSFCH symbol; the receiving and transmitting unit 1310 is further configured to transmit, on a first resource, target information, where the first resource is a resource in a PSFCH symbol, the target information includes one of first data, second data, first feedback information, and second feedback information, the first data is data to be received by the communication device 1300 in a first time slot, the second data is data to be sent by the communication device 1300 in the first time slot, the first feedback information is feedback information to be received by the communication device 1300, and the second feedback information is feedback information to be sent by the communication device 1300.

In this embodiment, the transceiver 1310 of the communication apparatus 1300 receives the COT indication information of the first terminal device, and the communication apparatus 1300 shares a first time slot within the first terminal device COT, where the first time slot includes a PSFCH symbol, and the transceiver 1310 may transmit the target information using a first resource among the resources included in the PSFCH symbol. The communication apparatus 1300 may reduce resource waste by using the first resource, and further, when the resource included in the PSFCH symbol is not used at all, the communication apparatus 1300 may transmit the target information on the first resource, so that the LBT of the other terminal device at the PSFCH symbol may be avoided to be successful, and the COT may be interrupted.

In this embodiment of the present application, the target information includes first data or second data, where the transceiver 1310 is specifically configured to: receiving the first data on a second resource, the second resource comprising the first resource; alternatively, the second data is transmitted on a second resource, the second resource comprising the first resource.

In this embodiment, when the first resource is used to receive the first feedback information and the communication device 1300 receives data in the first time slot, the resource used by the communication device 1300 to receive the first data includes a resource corresponding to the GAP time unit in the first time slot; alternatively, when the first resource is used to transmit the second feedback information and the communication device 1300 transmits data in the first time slot, the communication device 1300 is used to transmit the second data including the resource corresponding to the GAP time unit in the first time slot.

In this embodiment of the present application, the transceiver 1310 transmits the target information on the first resource according to at least one of the first information, where the first information includes: priority of the first data; priority of the second data; priority of the first feedback information; priority of the second feedback information.

In this embodiment of the present application, the transceiver 1310 transmits the target information on the first resource according to at least one of the first information, where the first information includes: delay information of the first data; delay information of the second data; delay information of the first feedback information; and delay information of the second feedback information.

In an embodiment of the present application, the communication apparatus 1300 further comprises a determining unit 1320 for determining that the first resource is available according to second information, the second information comprising at least one of: the method comprises the steps of determining a transmission type of third data, a third data HARQ feedback type, an energy measurement value associated with the third data and whether the first terminal device is a target terminal device of the third data, wherein the third data is data transmitted on a second time slot, and the second time slot is at least one time slot determined according to a feedback timing and the first time slot.

In this embodiment of the present application, the transceiver 1310 is further configured to receive first indication information from the first terminal device, where the first indication information is used to instruct the communications apparatus 1300 to send second data to the first terminal device on the second resource; or, the second instruction information from the first terminal device is received, where the second instruction information is used to instruct the communication apparatus 1300 to send the second feedback information to the first terminal device on the first resource.

In the embodiment of the present application, the target information includes second data, and the transceiver 1310 is further configured to: and sending third indication information, wherein the third indication information indicates that the second resource comprises the first resource.

Fig. 14 illustrates a communication device 1400 provided by an embodiment of the present application. The communication apparatus 1400 includes an acquisition unit 1410 and a determination unit 1420. The communication apparatus 1400 corresponds to the first terminal device in fig. 6, and may include units that perform the step S620 in the method 600 in fig. 6, and each unit in the communication apparatus 1400 and the other operations and/or functions described above are respectively for implementing the corresponding flow in fig. 6.

Specifically, the communication device 1400 includes: an obtaining unit 1410, configured to obtain a channel access time COT, where the COT includes a first time slot, and the first time slot includes a PSFCH symbol; a determining unit 1420, configured to determine, according to second information, that a first resource is available, where the first resource is a resource in a PSFCH symbol, and the second information includes at least one of: the transmission type of the third data, the third data HARQ feedback type, the energy measure associated with the third data and whether the communication device 1400 is the target communication device 1400 of the third data, wherein the third data is data transmitted on a second time slot, the second time slot being at least one time slot determined from the feedback timing and the first time slot.

In this embodiment of the present application, the determining unit 1420 is specifically configured to determine that the first resource is available when the second information meets a preset condition, where the preset condition includes at least one of: the transmission type of the third data is broadcast; the transmission type of the third data is unicast or multicast and HARQ feedback is disabled; the energy measurement value associated with the third data is smaller than or equal to a preset threshold value; the communication device 1400 is not the target communication device 1400 of the third data.

In the present embodiment, the second time slot is a time slot used by the communication device 1400.

Fig. 15 shows a communication device 1500 provided in an embodiment of the present application, the communication device 1500 including a transceiver unit 1510 and a determination unit 1520. The communication apparatus 1500 corresponds to the second terminal device in fig. 11, and may include a unit that performs step S1120 in the method 1100 in fig. 11, and each unit in the communication apparatus 1500 and the other operations and/or functions described above are respectively for implementing the corresponding flow in fig. 11.

Specifically, the communication apparatus 1500 includes a transceiver 1510 configured to receive, from a first terminal device, COT indication information, where a time unit indicated by the COT indication information includes a first time slot, and the first time slot includes a PSFCH symbol; a determining unit 1520, configured to determine, according to second information, that a first resource is available, where the first resource is a resource in a PSFCH symbol, and the second information includes at least one of: the method comprises the steps of transmitting a third data, a third data HARQ feedback type, an energy measurement value associated with the third data and whether the first terminal device is a target terminal device of the third data, wherein the third data is data transmitted on a second time slot, and the second time slot is at least one time slot determined according to a feedback timing and the first time slot.

In this embodiment of the present application, the determining unit 1520 is specifically configured to determine that the first resource is available when the second information meets a preset condition, where the preset condition includes at least one of: the transmission type of the third data is broadcast; the transmission type of the third data is unicast or multicast and HARQ feedback is disabled; the energy measurement value associated with the third data is smaller than or equal to a preset threshold value; the first terminal device is not the target terminal device of the third data.

In the embodiment of the present application, the second time slot is a time slot used by the first terminal device.

Fig. 16 shows a schematic block diagram of a communication device according to an embodiment of the present application.

The communication apparatus 1600 shown in fig. 16 may correspond to the communication apparatus described in the foregoing, and in particular, the communication apparatus 1600 may be a specific example of the first terminal device or the second terminal device described in the foregoing. The communication apparatus 1600 includes: processor 1620. In an embodiment of the present application, the processor 1620 is configured to implement a corresponding control management operation, for example, the processor 1620 is configured to support the apparatus to perform the method or the operation or the function shown in fig. 6 and 11 in the foregoing embodiment. Optionally, the communication device 1600 may further include: memory 1610 and communication interface 1630; processor 1620, communication interface 1630, and memory 1610 may be interconnected or by bus 1640. Wherein communication interface 1630 is used to support communication for the device and memory 1610 is used to store program codes and data for the device. Processor 1620 invokes code or data stored in memory 1610 to perform a corresponding operation. The memory 1610 may or may not be coupled to the processor. The coupling in the embodiments of the present application is an indirect coupling or communication connection between devices, units, or modules, which may be in electrical, mechanical, or other forms for information interaction between the devices, units, or modules.

The processor 1620 may be a central processor unit, a general purpose processor, a digital signal processor, a dedicated integrated circuit, a field programmable gate array or other programmable logic device, a transistor logic device, a hardware component, or any combination thereof. Which may implement or perform the various exemplary logic blocks, modules, and circuits described in connection with this disclosure. The processor may also be a combination that performs the function of a computation, e.g., a combination comprising one or more microprocessors, a combination of a digital signal processor and a microprocessor, and so forth. The communication interface 1630 may be a transceiver, circuit, bus, module, or other type of communication interface. Bus 1640 may be a peripheral component interconnect standard (peripheral component interconnect, PCI) bus or an extended industry standard architecture (extended industry standard architecture, EISA) bus, among others. The buses may be classified as address buses, data buses, control buses, etc. For ease of illustration, only one thick line is shown in fig. 16, but not only one bus or one type of bus.

Those of ordinary skill in the art will appreciate that the various illustrative elements and algorithm steps described in connection with the embodiments disclosed herein may be implemented as electronic hardware, or combinations of computer software and electronic hardware. Whether such functionality is implemented as hardware or software depends upon the particular application and design constraints imposed on the solution. Skilled artisans may implement the described functionality in varying ways for each particular application, but such implementation decisions should not be interpreted as causing a departure from the scope of the present application.

It will be clear to those skilled in the art that, for convenience and brevity of description, specific working procedures of the above-described systems, apparatuses and units may refer to corresponding procedures in the foregoing method embodiments, and are not repeated herein.

In the several embodiments provided in this application, it should be understood that the disclosed systems, devices, and methods may be implemented in other manners. For example, the apparatus embodiments described above are merely illustrative, e.g., the division of the elements is merely a logical function division, and there may be additional divisions when actually implemented, e.g., multiple elements or components may be combined or integrated into another system, or some features may be omitted or not performed. Alternatively, the coupling or direct coupling or communication connection shown or discussed may be through some interface, device or unit, and may be in electrical, mechanical or other form.

The units described as separate units may or may not be physically separate, and units shown as units may or may not be physical units, may be located in one place, or may be distributed on a plurality of network units. Some or all of the units may be selected according to actual needs to achieve the purpose of the solution of this embodiment.

In addition, each functional unit in the embodiments of the present application may be integrated in one processing unit, or each unit may exist alone physically, or two or more units may be integrated in one unit.

The functions, if implemented in the form of software functional units and sold or used as a stand-alone product, may be stored in a computer-readable storage medium. Based on such understanding, the technical solution of the present application may be embodied essentially or in a part contributing to the prior art or in a part of the technical solution, in the form of a software product stored in a storage medium, including several instructions for causing a computer device (which may be a personal computer, a server, or a network device, etc.) to perform all or part of the steps of the methods described in the embodiments of the present application. And the aforementioned storage medium includes: a U-disk, a removable hard disk, a read-only memory (ROM), a random access memory (random access memory, RAM), a magnetic disk, or an optical disk, or other various media capable of storing program codes.

The foregoing is merely specific embodiments of the present application, but the scope of the present application is not limited thereto, and any person skilled in the art who is familiar with the technical scope of the present application can easily think about the changes or substitutions, and the changes or substitutions are covered in the scope of the present application. Therefore, the protection scope of the present application shall be subject to the protection scope of the claims.

Claims

1. A method of side-link communication, comprising:

a first terminal device obtains a channel access time COT, wherein the COT comprises a first time slot, and the first time slot comprises a physical side uplink feedback channel PSFCH symbol;

the first terminal equipment transmits target information on a first resource, wherein the first resource is a resource in the PSFCH symbol, the target information comprises one of first data, second data, first feedback information and second feedback information, the first data is data to be sent by the first terminal equipment on the first time slot, the second data is data to be received by the first terminal equipment on the first time slot, the first feedback information is feedback information to be sent by the first terminal equipment, and the second feedback information is feedback information to be received by the first terminal equipment.

2. The method of claim 1, wherein the target information comprises first data or second data, wherein the first terminal device transmits target information on a first resource, comprising:

the first terminal equipment sends the first data on a second resource, wherein the second resource comprises the first resource; or,

The first terminal device receives the second data on the second resource, the second resource comprising the first resource.

3. A method according to claim 1 or 2, characterized in that the resources comprised in the PSFCH symbol are available.

4. A method according to claim 2 or 3, wherein the second resource further comprises at least one of:

the resources corresponding to the automatic gain control AGC symbol in the first time slot, the resources corresponding to the GAP time unit in the first time slot and the resources corresponding to the cyclic prefix extension CPE time unit in the first time slot.

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

when the first resource is used for sending the first feedback information and the first terminal equipment sends data in the first time slot, the resource used for sending the first data by the first terminal equipment comprises a resource corresponding to a GAP time unit in the first time slot;

or,

when the first resource is used for receiving the second feedback information and the first terminal device receives data in the first time slot, the first terminal device is used for receiving the second data and comprises resources corresponding to the GAP time unit in the first time slot.

6. The method according to any of claims 1 to 5, wherein the first terminal device transmits target information on the first resource according to at least one of first information, the first information comprising:

a priority of the first data;

a priority of the second data;

the priority of the first feedback information;

and the priority of the second feedback information.

7. The method according to any of claims 1 to 6, wherein the first terminal device transmits target information on the first resource according to at least one of first information, the first information comprising:

delay information of the first data;

delay information of the second data;

delay information of the first feedback information;

and delay information of the second feedback information.

8. The method according to any of claims 1 to 7, characterized in that before the first terminal device transmits target information on the first resource, the method further comprises:

the first terminal device determines that the first resource is available according to second information, wherein the second information comprises at least one of the following:

A transmission type of third data, the third data HARQ feedback type, an energy measurement value associated with the third data, and whether the first terminal device is a target terminal device of the third data, where the third data is data transmitted on a second time slot, and the second time slot is at least one time slot determined according to the feedback timing and the first time slot.

9. The method of claim 8, wherein the first terminal device determining that the first resource is available based on second information comprises:

when the second information meets a preset condition, the first terminal device determines that the first resource is available, and the preset condition comprises at least one of the following:

the transmission type of the third data is broadcast;

the transmission type of the third data is unicast or multicast and HARQ feedback is disabled;

the energy measurement value associated with the third data is smaller than or equal to a preset threshold value;

the first terminal device is not a target terminal device for the third data.

10. The method according to any one of claims 1 to 9, wherein,

before the first terminal device transmits the target information on the first resource, the method further comprises:

The first terminal equipment sends first indication information to second terminal equipment, wherein the first indication information is used for indicating the second terminal equipment to send the second data to the first terminal equipment on the second resource;

or,

the first terminal equipment sends second indication information to second terminal equipment, wherein the second indication information is used for indicating the second terminal equipment to send the second feedback information to the first terminal equipment on the first resource.

11. A method of side-link communication, comprising:

the method comprises the steps that a second terminal device receives COT indication information from a first terminal device, wherein a time unit indicated by the COT indication information comprises a first time slot, and the first time slot comprises a PSFCH symbol;

the second terminal equipment transmits target information on a first resource, wherein the first resource is a resource in the PSFCH symbol, the target information comprises one of first data, second data, first feedback information and second feedback information, the first data is data to be received by the second terminal equipment on the first time slot, the second data is data to be sent by the second terminal equipment on the first time slot, the first feedback information is feedback information to be received by the second terminal equipment, and the second feedback information is feedback information to be sent by the second terminal equipment.

12. The method of claim 11, wherein the target information comprises first data or second data, wherein the second terminal device transmits target information on a first resource, comprising:

the second terminal device receives the first data on a second resource, wherein the second resource comprises the first resource; or,

and the second terminal equipment sends the second data on the second resource, wherein the second resource comprises the first resource.

13. The method according to claim 11 or 12, characterized in that resources comprised in the PSFCH symbol are available.

14. The method of claim 12 or 13, wherein the second resource further comprises at least one of:

the resources corresponding to the AGC symbols in the first time slot, the resources corresponding to the GAP time units in the first time slot and the resources corresponding to the CPE time units in the first time slot.

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

when the first resource is used for receiving the first feedback information and the second terminal equipment receives data in the first time slot, the resource used for receiving the first data by the second terminal equipment comprises a resource corresponding to a GAP time unit in the first time slot;

Or,

when the first resource is used for sending the second feedback information and the second terminal device sends data in the first time slot, the second terminal device is used for sending the second data to include a resource corresponding to the GAP time unit in the first time slot.

16. The method according to any of claims 11 to 15, wherein the second terminal device transmits target information on the first resource according to at least one of first information, the first information comprising:

a priority of the first data;

a priority of the second data;

the priority of the first feedback information;

and the priority of the second feedback information.

17. The method according to any of claims 11 to 16, wherein the second terminal device transmits target information on the first resource according to at least one of first information, the first information comprising:

delay information of the first data;

delay information of the second data;

delay information of the first feedback information;

and delay information of the second feedback information.

18. The method according to any of the claims 11 to 17, characterized in that before the second terminal device transmits target information on the first resource, the method further comprises:

The second terminal device determines that the first resource is available according to second information, wherein the second information comprises at least one of the following:

19. The method of claim 18, wherein the second terminal device determining that the first resource is available based on second information comprises:

when the second information meets a preset condition, the second terminal equipment determines that the first resource is available, and the preset condition comprises at least one of the following:

the transmission type of the third data is broadcast;

the first terminal device is not a target terminal device for the third data.

20. The method according to any one of claims 11 to 15, wherein,

before the second terminal device transmits the target information on the first resource, the method further comprises:

the second terminal equipment receives first indication information from the first terminal equipment, wherein the first indication information is used for indicating the second terminal equipment to send the second data to the first terminal equipment on the second resource;

or,

the second terminal equipment receives second indication information from the first terminal equipment, wherein the second indication information is used for indicating the second terminal equipment to send the second feedback information to the first terminal equipment on the first resource.

21. The method of any of claims 12 to 20, wherein the target information comprises the second data, the method further comprising:

and the second terminal equipment sends third indication information, and the third indication information indicates that the second resource comprises the first resource.

22. A communication device comprising means for performing the functions of the method of any one of claims 1 to 10 or 11 to 21.

23. A communication device, comprising:

a processor and a transceiver for receiving computer code or instructions and transmitting to the processor, the processor executing the computer code or instructions, the method of any one of claims 1 to 10 or 11 to 21.

24. A communication system, comprising:

a first terminal device, a second terminal device in the method of any of claims 1 to 21.

25. A computer-readable storage medium comprising,

the computer readable medium stores a computer program;

the computer program, when run on a computer, causes the computer to perform the method of any one of claims 1 to 10 or 11 to 21.