CN117014118A

CN117014118A - Communication method and device

Info

Publication number: CN117014118A
Application number: CN202210468984.0A
Authority: CN
Inventors: 黄海宁; 黎超; 杨帆; 张天虹; 李君瑶
Original assignee: Huawei Technologies Co Ltd
Current assignee: Huawei Technologies Co Ltd
Priority date: 2022-04-29
Filing date: 2022-04-29
Publication date: 2023-11-07
Also published as: WO2023207493A1

Abstract

The application provides a communication method and a communication device, which can improve the reliability of data transmission. The method comprises the following steps: the method comprises the steps that a first terminal device sends first indication information to a second terminal device, wherein the first indication information is used for indicating at least one physical sidelink feedback channel PSFCH time domain resource in channel occupation time COT; the first terminal equipment sends a first transmission block to the second terminal equipment in COT; the first terminal equipment receives first HARQ information corresponding to a first transmission block from the second terminal equipment in a first PSFCH time domain resource in the at least one PSFCH time domain resource, wherein the first HARQ information occupies at least one interlace.

Description

Communication method and device

Technical Field

The present application relates to the field of communications, and more particularly, to a method and apparatus for communication.

Background

The hybrid automatic repeat request (hybrid automatic repeat request, HARQ) technique is a technique formed by combining a forward error correction code (forward error correction, FEC) with an automatic repeat request (automatic repeat request, ARQ). The FEC technology can automatically correct transmission error codes by adding redundancy error correction codes into transmission code columns under a certain condition, and reduce Bit Error Rate (BER) of received signals. ARQ recovers an erroneous message by a receiving end requesting a transmitting end to retransmit the erroneous data message, which is one of methods for handling errors caused by a channel in communication. The transmitting end transmits data to the receiving end, and the receiving end does not successfully decode the data and feeds back a negative acknowledgement (negative acknowledgement, NACK) message to the transmitting end, and/or the receiving end successfully decodes the data and feeds back an Acknowledgement (ACK) message to the transmitting end.

Currently, in the side-row HARQ feedback on the licensed spectrum, the terminal device determines the physical side-row feedback channel (physical sidelink feedback channel, PSFCH) resource for transmitting the HARQ information corresponding to the data according to the sub-channel and the time slot occupied by the physical side-row shared channel (physical sidelink shared channel, PSSCH) for transmitting the data. However, the problem how to perform the sidestream HARQ feedback of the terminal device on the unlicensed spectrum needs to be solved.

Disclosure of Invention

The application provides a communication method and a communication device, which can improve the reliability of data transmission.

In a first aspect, a method of communication is provided, which may be performed by a chip or a chip system at a terminal device side. The method comprises the following steps: the method comprises the steps that a first terminal device sends first indication information to a second terminal device, wherein the first indication information is used for indicating at least one physical sidelink feedback channel PSFCH time domain resource in channel occupation time COT; the first terminal equipment sends a first transmission block to the second terminal equipment in the COT; the first terminal equipment receives first hybrid automatic repeat request (HARQ) information corresponding to the first transmission block from the second terminal equipment in a first PSFCH time domain resource in the at least one PSFCH time domain resource, wherein the first HARQ information occupies at least one interlace which comprises at least one resource block.

Based on the above technical solution, the first terminal device sends, to the second terminal device, first indication information for indicating at least one PSFCH time domain resource in the COT, which time domain resources are used for transmitting HARQ information, so as to avoid interruption of the COT caused by transmission of HARQ information in PSFCH time domain resources that are not pre-configured in some candidate PSFCH time domain resources/periodicity, thereby improving reliability of data transmission.

With reference to the first aspect, in certain implementation manners of the first aspect, the method further includes: the first terminal device receives a second transmission block from the second terminal device in the COT; and the first terminal equipment sends second HARQ information corresponding to the second transmission block to the second terminal equipment in a second PSFCH time domain resource in the at least one PSFCH time domain resource, wherein the second HARQ information occupies at least one interlace.

With reference to the first aspect, in certain implementation manners of the first aspect, the first indication information is used to indicate that the first PSFCH time domain resource is used for the first terminal device to receive the first HARQ information, and the second PSFCH time domain resource is used for the first terminal device to send the second HARQ information. The transmission and receiving conflict of the HARQ information can be avoided, and the reliability of data transmission is improved.

With reference to the first aspect, in certain implementations of the first aspect, the at least one PSFCH time domain resource belongs to a candidate PSFCH time domain resource within the COT. Optionally, the first indication information is used to indicate at least one PSFCH time domain resource of the candidate PSFCH time domain resources within the COT of the first terminal device. Optionally, the first indication information is used to indicate whether each candidate PSFCH time domain resource in the COT of the first terminal device is a time domain resource in the at least one PSFCH time domain resource.

With reference to the first aspect, in certain implementations of the first aspect, a number of symbols occupied by one PSFCH time domain resource of the at least one PSFCH time domain resource is equal to or greater than 1. That is, the number of symbols occupied by the partial PSFCH time domain resource in the at least one PSFCH time domain resource may be greater than 1, and the number of symbols occupied by the partial PSFCH time domain resource may be equal to 1; alternatively, the number of symbols occupied by all PSFCH time domain resources in the at least one PSFCH time domain resource may be greater than 1; alternatively, the number of symbols occupied by all PSFCH time domain resources in the at least one PSFCH time domain resource may be equal to 1.

With reference to the first aspect, in some implementations of the first aspect, a first lateral control information SCI schedules the first transport block, the first SCI indicates that the first transport block is multicast, and a number of symbols occupied by the first PSFCH time domain resource is greater than 1.

With reference to the first aspect, in certain implementations of the first aspect, a third PSFCH time domain resource of the at least one PSFCH time domain resource occupies a first symbol and a second symbol, where the first symbol and the second symbol are used for transmitting HARQ information, or the first symbol and the second symbol are used for receiving HARQ information, where the third PSFCH time domain resource includes the first PSFCH time domain resource or the second PSFCH time domain resource.

To meet the OCB requirement, the transmission of HARQ information is in the form of PRB-based interleaving. The PSFCH time domain resources occupying one symbol include a limited number of interlaces and may not be available. Therefore, increasing the symbols occupied by the PSFCH time domain resources for transmitting HARQ information can improve the reliability of data transmission. That is, one PSFCH slot may include one or more symbols for transmitting HARQ information.

With reference to the first aspect, in some implementations of the first aspect, the frequency domain resource and the code domain resource of the first symbol are used first, and the frequency domain resource and the code domain resource of the second symbol are used later, or the frequency domain resource of the first symbol and the frequency domain resource of the second symbol are used first, and the code domain resource of the first symbol and the code domain resource of the second symbol are used later.

With reference to the first aspect, in certain implementations of the first aspect, a third PSFCH time domain resource of the at least one PSFCH time domain resource occupies a first symbol and a second symbol, the first symbol is used for transmitting HARQ information, the second symbol is used for receiving HARQ information, or the first symbol is used for receiving HARQ information, the second symbol is used for transmitting HARQ information, wherein the third PSFCH time domain resource includes the first PSFCH time domain resource and/or the second PSFCH time domain resource.

With reference to the first aspect, in some implementations of the first aspect, a time slot in which the third PSFCH time domain resource is located includes a symbol for transmitting a third transport block, the first symbol occupied by the third PSFCH time domain resource is used for transmitting HARQ information, and the second symbol occupied by the third PSFCH time domain resource is used for receiving HARQ information, where the first symbol precedes the second symbol; or the time slot where the third PSFCH time domain resource is located includes a symbol for receiving a fourth transport block, the first symbol occupied by the third PSFCH time domain resource is used for receiving HARQ information, and the second symbol occupied by the third PSFCH time domain resource is used for sending HARQ information. The scheme can ensure that the number of the transmitting-receiving conversion points is as small as possible.

With reference to the first aspect, in certain implementations of the first aspect, the at least one interleaved frequency domain resource occupied by the first transport block includes at least one interleaved frequency domain resource occupied by the first HARQ information, and the at least one interleaved frequency domain resource occupied by the second transport block includes at least one interleaved frequency domain resource occupied by the second HARQ information. Each interlace used for transmitting the transmission block is provided with a corresponding interlace used for transmitting the HARQ information, so that the transmission of the HARQ information can be further ensured, and the reliability of data transmission is improved.

In a second aspect, a method of communication is provided, which may be performed by a chip or a chip system at a terminal device side. The method comprises the following steps: the second terminal equipment receives first indication information from the first terminal equipment, wherein the first indication information is used for indicating at least one physical sidelink feedback channel PSFCH time domain resource in the channel occupation time COT; the second terminal device receives a first transmission block from the first terminal device in the COT; and the second terminal equipment sends first hybrid automatic repeat request (HARQ) information corresponding to the first transmission block to the first terminal equipment in a first PSFCH time domain resource in the at least one PSFCH time domain resource, wherein the first HARQ information occupies at least one interlace which comprises at least one resource block.

Based on the above technical solution, the second terminal device receives the first indication information sent by the first terminal device and used for indicating at least one PSFCH time domain resource in the COT, and the second terminal device can obtain which time domain resources are used for transmitting HARQ information, so as to avoid interruption of the COT caused by transmission of HARQ information in PSFCH time domain resources which are not pre-configured in some candidate PSFCH time domain resources/periodicity, thereby improving reliability of data transmission.

With reference to the second aspect, in certain implementations of the second aspect, the method further includes: the second terminal equipment sends a second transmission block to the first terminal equipment in the COT; and the second terminal equipment receives second HARQ information corresponding to the second transmission block from the first terminal equipment in a second PSFCH time domain resource in the at least one PSFCH time domain resource, wherein the second HARQ information occupies at least one interlace.

With reference to the second aspect, in some implementations of the second aspect, the first indication information is used to indicate that the first PSFCH time domain resource is used for the first terminal device to receive the first HARQ information, and the second PSFCH time domain resource is used for the first terminal device to send the second HARQ information. The transmission and receiving conflict of the HARQ information can be avoided, and the reliability of data transmission is improved.

With reference to the second aspect, in certain implementations of the second aspect, the at least one PSFCH time domain resource belongs to a candidate PSFCH time domain resource within the COT. Optionally, the first indication information is used to indicate at least one PSFCH time domain resource of the candidate PSFCH time domain resources within the COT of the first terminal device. Optionally, the first indication information is used to indicate whether each candidate PSFCH time domain resource in the COT of the first terminal device is a time domain resource in the at least one PSFCH time domain resource.

With reference to the second aspect, in certain implementations of the second aspect, a number of symbols occupied by one PSFCH time domain resource of the at least one PSFCH time domain resource is equal to or greater than 1. That is, the number of symbols occupied by the partial PSFCH time domain resource in the at least one PSFCH time domain resource may be greater than 1, and the number of symbols occupied by the partial PSFCH time domain resource may be equal to 1; alternatively, the number of symbols occupied by all PSFCH time domain resources in the at least one PSFCH time domain resource may be greater than 1; alternatively, the number of symbols occupied by all PSFCH time domain resources in the at least one PSFCH time domain resource may be equal to 1.

With reference to the second aspect, in some implementations of the second aspect, a first side control information SCI schedules the first transport block, the first SCI indicates that the first transport block is multicast, and a number of symbols occupied by the first PSFCH time domain resource is greater than 1.

With reference to the second aspect, in certain implementations of the second aspect, a third PSFCH time domain resource of the at least one PSFCH time domain resource occupies a first symbol and a second symbol, where the first symbol and the second symbol are used for the first terminal device to transmit HARQ information, or the first symbol and the second symbol are used for the first terminal device to receive HARQ information, where the third PSFCH time domain resource includes the first PSFCH time domain resource or the second PSFCH time domain resource.

With reference to the second aspect, in some implementations of the second aspect, the frequency domain resource and the code domain resource of the first symbol are used first, the frequency domain resource and the code domain resource of the second symbol are used later, or the frequency domain resource of the first symbol and the frequency domain resource of the second symbol are used first, and the code domain resource of the first symbol and the code domain resource of the second symbol are used later.

With reference to the second aspect, in certain implementations of the second aspect, a third PSFCH time domain resource of the at least one PSFCH time domain resource occupies a first symbol and a second symbol, where the first symbol is used for the first terminal device to transmit HARQ information, the second symbol is used for the first terminal device to receive HARQ information, or the first symbol is used for the first terminal device to receive HARQ information, and the second symbol is used for the first terminal device to transmit HARQ information, where the third PSFCH time domain resource includes the first PSFCH time domain resource and/or the second PSFCH time domain resource.

With reference to the second aspect, in some implementations of the second aspect, the time slot in which the third PSFCH time domain resource is located includes a symbol for the first terminal device to send a third transport block, the first symbol occupied by the third PSFCH time domain resource is used for the first terminal device to send HARQ information, and the second symbol occupied by the third PSFCH time domain resource is used for the first terminal device to receive HARQ information, where the first symbol precedes the second symbol; or the time slot where the third PSFCH time domain resource is located includes a symbol for the first terminal equipment to receive a fourth transmission block, the first symbol occupied by the third PSFCH time domain resource is used for the first terminal equipment to receive HARQ information, and the second symbol occupied by the third PSFCH time domain resource is used for the first terminal equipment to send HARQ information. The scheme can ensure that the number of the transmitting-receiving conversion points is as small as possible.

With reference to the second aspect, in some implementations of the second aspect, the at least one interleaved frequency domain resource occupied by the first transport block includes at least one interleaved frequency domain resource occupied by the first HARQ information, and the at least one interleaved frequency domain resource occupied by the second transport block includes at least one interleaved frequency domain resource occupied by the second HARQ information. Each interlace used for transmitting the transmission block is provided with a corresponding interlace used for transmitting the HARQ information, so that the transmission of the HARQ information can be further ensured, and the reliability of data transmission is improved.

In a third aspect, a method of communication is provided, which may be performed by a chip or a chip system at a terminal device side. The method comprises the following steps: the method comprises the steps that a first terminal device sends a first transmission block to a second terminal device in a channel occupation time COT, wherein the first transmission block occupies at least one interlace, and the interlace comprises at least one resource block; and the first terminal equipment receives first hybrid automatic repeat request (HARQ) information corresponding to the first transmission block from the second terminal equipment in the COT, wherein at least one staggered frequency domain resource occupied by the first HARQ information is determined according to at least one staggered frequency domain resource occupied by the first transmission block.

Based on the above technical solution, the frequency domain resource of at least one interlace occupied by the first HARQ information corresponding to the first transport block is determined according to the frequency domain resource of at least one interlace occupied by the first transport block, and each interlace for transmitting the TB has an interlace for transmitting the HARQ information corresponding to the interlace, so that the transmission of the HARQ information can be further ensured, and the reliability of data transmission can be improved.

With reference to the third aspect, in some implementations of the third aspect, the at least one interleaved frequency domain resource occupied by the first transport block includes at least one interleaved frequency domain resource occupied by the first HARQ information. Optionally, the frequency domain resource of the interlace occupied by the first transport block is the same as the frequency domain resource of the interlace occupied by the first HARQ information, or the frequency domain resource of the interlace occupied by the first HARQ information is a frequency domain resource of a partial interlace among the plurality of interlaces occupied by the first transport block.

With reference to the third aspect, in some implementations of the third aspect, a frequency domain resource corresponding to a jth interlace of a first slot is the same as a frequency domain resource corresponding to an ith interlace of a second slot, where i and j are positive integers, and the second slot is a slot that receives the first HARQ information.

With reference to the third aspect, in certain implementations of the third aspect, the method further includes: the first terminal equipment sends a second transmission block to the second terminal equipment in the COT, wherein the second transmission block occupies at least one interlace; and the first terminal equipment receives second HARQ information corresponding to the second transmission block from the second terminal equipment in the COT, wherein at least one staggered frequency domain resource occupied by the second HARQ information is determined according to at least one staggered frequency domain resource occupied by the second transmission block.

With reference to the third aspect, in some implementations of the third aspect, the at least one interleaved frequency domain resource occupied by the second transport block includes at least one interleaved frequency domain resource occupied by the second HARQ information.

With reference to the third aspect, in some implementations of the third aspect, a frequency domain resource corresponding to a j-th interlace of a third slot is the same as a frequency domain resource corresponding to an i-th interlace of a second slot, where the third slot is a slot transmitting the second transport block, the first slot is a slot receiving the second HARQ information, and the i-th interlace of the third slot is associated with the j-th interlace of the second slot.

With reference to the third aspect, in some implementations of the third aspect, a code domain resource of a PSFCH resource corresponding to an i-th interlace in the first slot is different from a code domain resource of a PSFCH resource corresponding to an i-th interlace in the third slot. Illustratively, the code domain resources used when transmitting the first HARQ information are different from the code domain resources used when transmitting the second HARQ information.

With reference to the third aspect, in some implementations of the third aspect, the first time slot and the third time slot are associated with the second time slot, where the second time slot is a time slot including a PSFCH resource after the first terminal device transmits M time slots after the first transport block in the first time slot, and the second time slot is a time slot including a PSFCH resource after the first terminal device transmits M time slots after the second transport block in the third time slot.

When the time slots of the plurality of transmission TBs correspond to one time slot for transmitting the HARQ information, the HARQ information corresponding to the time slots of the plurality of transmission TBs is code division multiplexed, so that insufficient PSFCH resources can be avoided, and the reliability of data transmission can be further improved.

With reference to the third aspect, in some implementations of the third aspect, at least one fourth time slot is associated with a second time slot, where the second time slot is a time slot used by the first terminal device to receive HARQ information, the at least one fourth time slot is a time slot used by the first terminal device to transmit a TB, the second time slot is a time slot used by a first of M time slots spaced after the fourth time slot to receive HARQ information, and the at least one fourth time slot includes the first time slot and the third time slot. Or, at least one fifth time slot is associated with a sixth time slot, the sixth time slot is a time slot used for transmitting HARQ information by the first terminal device, at least one fifth time slot is a time slot used for receiving a TB by the first terminal device, at least one fifth time slot is a time slot shared in the COT of the first terminal device, and the sixth time slot is a time slot used for transmitting HARQ information by the first of M time slots after the fifth time slot.

In a fourth aspect, a method of communication is provided, which may be performed by a chip or a chip system at a terminal device side. The method comprises the following steps: the second terminal equipment receives a first transmission block from the first terminal equipment in a channel occupation time COT, wherein the first transmission block occupies at least one interlace which comprises at least one resource block; and the second terminal equipment sends first hybrid automatic repeat request (HARQ) information corresponding to the first transmission block to the first terminal equipment in the COT, wherein at least one staggered frequency domain resource occupied by the first HARQ information is determined according to the at least one staggered frequency domain resource occupied by the first transmission block.

With reference to the fourth aspect, in some implementations of the fourth aspect, the at least one interleaved frequency domain resource occupied by the first transport block includes at least one interleaved frequency domain resource occupied by the first HARQ information. Optionally, the frequency domain resource of the interlace occupied by the first transport block is the same as the frequency domain resource of the interlace occupied by the first HARQ information, or the frequency domain resource of the interlace occupied by the first HARQ information is a frequency domain resource of a partial interlace among the plurality of interlaces occupied by the first transport block.

With reference to the fourth aspect, in some implementations of the fourth aspect, a frequency domain resource corresponding to a jth interlace of a first slot is the same as a frequency domain resource corresponding to an ith interlace of a second slot, where i and j are positive integers, and the second slot is a slot that receives the first HARQ information.

With reference to the fourth aspect, in certain implementations of the fourth aspect, the method further includes: the second terminal equipment receives a second transmission block from the first terminal equipment in the COT, wherein the second transmission block occupies at least one interlace; and the second terminal equipment sends second HARQ information corresponding to the second transmission block to the first terminal equipment in the COT, wherein at least one staggered frequency domain resource occupied by the second HARQ information is determined according to at least one staggered frequency domain resource occupied by the second transmission block.

With reference to the fourth aspect, in some implementations of the fourth aspect, the at least one interleaved frequency domain resource occupied by the second transport block includes at least one interleaved frequency domain resource occupied by the second HARQ information.

With reference to the fourth aspect, in some implementations of the fourth aspect, a frequency domain resource corresponding to a jth interlace of a third slot is the same as a frequency domain resource corresponding to an ith interlace of a second slot, where the third slot is a slot in which the second terminal device receives the second transport block, the second slot is a slot in which the second terminal device sends the second HARQ information, and the jth interlace of the third slot is associated with the jth interlace of the second slot.

With reference to the fourth aspect, in some implementations of the fourth aspect, a code domain resource of a PSFCH resource corresponding to an i-th interlace in the first slot is different from a code domain resource of a PSFCH resource corresponding to an i-th interlace in the third slot.

With reference to the fourth aspect, in some implementations of the fourth aspect, the first time slot and the third time slot are associated with the second time slot, the second time slot is a first time slot including a PSFCH resource after the second terminal device receives M time slots after the first transport block in the first time slot, and the second time slot is a first time slot including a PSFCH resource after the second terminal device receives M time slots after the second transport block in the third time slot.

With reference to the fourth aspect, in some implementations of the fourth aspect, at least one fourth time slot is associated with a second time slot, the second time slot being a time slot used by the first terminal device to receive HARQ information, the at least one fourth time slot being a time slot used by the first terminal device to transmit a TB, the second time slot being a time slot used by a first one of M time slots spaced after the fourth time slot to receive HARQ information, the at least one fourth time slot including the first time slot and the third time slot. Or, at least one fifth time slot is associated with a sixth time slot, the sixth time slot is a time slot used for transmitting the HARQ information by the first terminal device, at least one fifth time slot is a time slot used for receiving the TB by the first terminal device, at least one fifth time slot is a time slot shared in the COT of the first terminal device, and the sixth time slot is a time slot used for transmitting the HARQ information by the first of M time slots after the fifth time slot.

In a fifth aspect, a communication apparatus is provided, which may be applied to the first terminal device in the first aspect, and the apparatus includes: a sending unit, configured to send first indication information to a second terminal device, where the first indication information is used to indicate at least one physical sidelink feedback channel PSFCH time domain resource within a channel occupation time COT; the sending unit is further configured to send a first transport block to the second terminal device in the COT; a receiving unit, configured to receive, in a first PSFCH time domain resource of the at least one PSFCH time domain resource, first hybrid automatic repeat request HARQ information corresponding to the first transport block from the second terminal device, where the first HARQ information occupies at least one interlace, and the interlace includes at least one resource block.

With reference to the fifth aspect, in certain implementations of the fifth aspect, the receiving unit is further configured to receive a second transport block from the second terminal device within the COT; the first terminal equipment sends second HARQ information corresponding to the second transmission block to the second terminal equipment in a second PSFCH time domain resource in the at least one PSFCH time domain resource, wherein the second HARQ information occupies at least one interlace; the sending unit is further configured to send, in a second PSFCH time domain resource of the at least one PSFCH time domain resource, second HARQ information corresponding to the second transport block to the second terminal device, where the second HARQ information occupies at least one interlace.

With reference to the fifth aspect, in certain implementations of the fifth aspect, the first indication information is used to indicate that the first PSFCH time domain resource is used to receive the first HARQ information, and the second PSFCH time domain resource is used to transmit the second HARQ information.

With reference to the fifth aspect, in certain implementations of the fifth aspect, the at least one PSFCH time domain resource belongs to a candidate PSFCH time domain resource within the COT.

With reference to the fifth aspect, in certain implementations of the fifth aspect, a number of symbols occupied by one PSFCH time domain resource of the at least one PSFCH time domain resource is equal to or greater than 1.

With reference to the fifth aspect, in certain implementations of the fifth aspect, the first lateral control information SCI schedules the first transport block, the first SCI indicates that the first transport block is multicast, and a number of symbols occupied by the first PSFCH time domain resource is greater than 1.

With reference to the fifth aspect, in certain implementations of the fifth aspect, a third PSFCH time domain resource of the at least one PSFCH time domain resource occupies a first symbol and a second symbol, where the first symbol and the second symbol are used for transmitting HARQ information, or the first symbol and the second symbol are used for receiving HARQ information, where the third PSFCH time domain resource includes the first PSFCH time domain resource or the second PSFCH time domain resource.

With reference to the fifth aspect, in some implementations of the fifth aspect, the frequency domain resources and the code domain resources of the first symbol are used first, the frequency domain resources and the code domain resources of the second symbol are used later, or the frequency domain resources of the first symbol and the frequency domain resources of the second symbol are used first, the code domain resources of the first symbol and the code domain resources of the second symbol are used later.

With reference to the fifth aspect, in certain implementations of the fifth aspect, a third PSFCH time domain resource of the at least one PSFCH time domain resource occupies a first symbol and a second symbol, the first symbol is used for transmitting HARQ information, the second symbol is used for receiving HARQ information, or the first symbol is used for receiving HARQ information, the second symbol is used for transmitting HARQ information, wherein the third PSFCH time domain resource includes the first PSFCH time domain resource and/or the second PSFCH time domain resource.

With reference to the fifth aspect, in some implementations of the fifth aspect, a time slot in which the third PSFCH time domain resource is located includes a symbol for transmitting a third transport block, the first symbol occupied by the third PSFCH time domain resource is used for transmitting HARQ information, and the second symbol occupied by the third PSFCH time domain resource is used for receiving HARQ information, where the first symbol precedes the second symbol; or the time slot where the third PSFCH time domain resource is located includes a symbol for receiving a fourth transport block, the first symbol occupied by the third PSFCH time domain resource is used for receiving HARQ information, and the second symbol occupied by the third PSFCH time domain resource is used for sending HARQ information.

With reference to the fifth aspect, in certain implementations of the fifth aspect, the at least one interleaved frequency domain resource occupied by the first transport block includes at least one interleaved frequency domain resource occupied by the first HARQ information, and the at least one interleaved frequency domain resource occupied by the second transport block includes at least one interleaved frequency domain resource occupied by the second HARQ information.

In a sixth aspect, there is provided a communication apparatus, which is applicable to the first terminal device according to the second aspect, the apparatus comprising: a sending unit, configured to send a first transport block to a second terminal device within a channel occupation time COT, where the first transport block occupies at least one interlace, and the interlace includes at least one resource block; and a receiving unit, configured to receive, in the COT, first HARQ information corresponding to the first transport block from the second terminal device, where at least one interleaved frequency domain resource occupied by the first HARQ information is determined according to at least one interleaved frequency domain resource occupied by the first transport block.

With reference to the sixth aspect, in certain implementations of the sixth aspect, the at least one interleaved frequency domain resource occupied by the first transport block includes at least one interleaved frequency domain resource occupied by the first HARQ information.

With reference to the sixth aspect, in some implementations of the sixth aspect, a frequency domain resource corresponding to a jth interlace of a first timeslot is the same as a frequency domain resource corresponding to an ith interlace of the second timeslot, where the first timeslot is a timeslot in which the first transport block is transmitted, the second timeslot is a timeslot in which the first HARQ is received, and the jth interlace of the first timeslot is associated with the jth interlace of the second timeslot, where i and j are positive integers.

With reference to the sixth aspect, in some implementations of the sixth aspect, the sending unit is further configured to send, within the COT, a second transport block to the second terminal device, where the second transport block occupies at least one interlace; the receiving unit is further configured to receive, in the COT, second HARQ information corresponding to the second transport block from the second terminal device, where at least one interleaved frequency domain resource occupied by the second HARQ information is determined according to at least one interleaved frequency domain resource occupied by the second transport block.

With reference to the sixth aspect, in certain implementations of the sixth aspect, the at least one interleaved frequency domain resource occupied by the second transport block includes at least one interleaved frequency domain resource occupied by the second HARQ information.

With reference to the sixth aspect, in some implementations of the sixth aspect, a frequency domain resource corresponding to a jth interlace of a third slot is the same as a frequency domain resource corresponding to an ith interlace of a second slot, where the third slot is a slot transmitting the second transport block, the first slot is a slot receiving the second HARQ information, and the jth interlace of the third slot is associated with the jth interlace of the second slot.

With reference to the sixth aspect, in some implementations of the sixth aspect, a code domain resource of a PSFCH resource corresponding to an i-th interlace in the first slot is different from a code domain resource of a PSFCH resource corresponding to an i-th interlace in the third slot.

With reference to the sixth aspect, in certain implementations of the sixth aspect, the first time slot and the third time slot are associated with the second time slot, the second time slot is a first time slot including a PSFCH resource after M time slots after the first terminal device transmits the first transport block in the first time slot, and the second time slot is a first time slot including a PSFCH resource after M time slots after the first terminal device transmits the second transport block in the third time slot.

In a seventh aspect, a communications device is provided 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, such as the methods of the first to fourth aspects or any of the embodiments of the first to fourth aspects.

In an eighth aspect, there is provided a computer-readable storage medium storing a computer program; the computer program or processor, when run on a computer, causes the computer or processor to perform the method as any one of the embodiments of the first to fourth aspects or the first to fourth aspects.

A ninth aspect provides a computer program product which, when run on a computer, causes the computer to perform the method as in the first to fourth aspects or any of the embodiments of the first to fourth aspects.

The solutions provided in the fifth to ninth aspects are used to implement or cooperatively implement the methods provided in the first to fourth aspects, so that the same or corresponding benefits as those of the first to fourth aspects can be achieved, and no further description is given here.

Drawings

Fig. 1 is a schematic diagram of a channel structure of a next slot following a standard cyclic prefix (normal cyclic prefix, NCP).

Fig. 2 is a schematic diagram of a channel structure of a next slot in the extended cyclic prefix (extended cyclic prefix, ECP).

Fig. 3 is a schematic diagram of periodically configured PSFCH resources.

Fig. 4 is a schematic diagram of the first part in Type1 LBT.

Fig. 5 is a Type2LBT schematic.

Fig. 6 is a schematic diagram of four PSSCH slots associated with one PSFCH slot.

Fig. 7 is a schematic diagram of an association of PSSCH slots for transmitting data and PSFCH slots for feeding back HARQ information.

Fig. 8 is a schematic diagram of a V2X system.

Fig. 9 is a schematic diagram of communication between a UE and a UE over a side-link.

Fig. 10 is a schematic flow chart interaction diagram of a method of communication according to an embodiment of the present application.

Fig. 11 is a candidate PSFCH time domain resource included in the COT when the configuration period of the PSFCH time domain resource is 2.

Fig. 12 is a diagram of candidate PSFCH time domain resources included in different COTs when the configuration period of the PSFCH time domain resources is 2.

Fig. 13 is a schematic illustration of an interlace.

Fig. 14 is a schematic diagram of determining PSSCH slots associated with PSFCH slots.

Fig. 15 is a schematic diagram of a PSFCH slot with symbol 1 occupied by PSFCH time domain resources.

Fig. 16 is a schematic diagram of the structure of a PSFCH slot with symbol 2 occupied by four PSFCH time domain resources.

Fig. 17 is a schematic diagram of a PSFCH slot including two PSFCH symbols.

Fig. 18 is a schematic flow chart interaction diagram of another method of communication proposed by an embodiment of the present application.

Fig. 19 is a schematic diagram of interleaving of different slots.

Fig. 20 is a schematic diagram of an interlace of a PSFCH slot including 2 PSFCH symbols.

Fig. 21 is a schematic block diagram of a communication device according to an embodiment of the present application.

Fig. 22 is a schematic block diagram of another communication device of an embodiment of the present application.

Fig. 23 is a schematic block diagram of a communication device of an embodiment of the present application.

Detailed Description

The technical scheme of the application will be described below with reference to the accompanying drawings.

The embodiments of the present application may be applied to various communication systems, such as a sidestream communication system (sidelink communication), an on-vehicle communication (vehicle to everything, V2X) system, a wireless local area network system (wireless local area network, WLAN), a narrowband base-internet of things, NB-IoT), a global system for mobile communications (global system for mobile communications, GSM), an enhanced data rates for GSM evolution system (enhanced data rate for GSM evolution, EDGE), a wideband code division multiple access system (wideband code division multiple access, WCDMA), a code division multiple access 2000 system (code division multiple access, CDMA 2000), a time division synchronous code division multiple access system (time division-synchronization code division multiple access, TD-SCDMA), a long term evolution system (long term evolution, LTE), satellite communication, a fifth generation (5th generation,5G) system, a sixth generation (6th generation,6G) system, communication over licensed spectrum, communication over unlicensed spectrum, or new communication systems in the future, etc.

The terminal device related in the embodiment of the application can be a device or a chip or a module which comprises a wireless receiving and transmitting function and can provide communication service for users. Specifically, the terminal device may be a device in a vehicle communication (vehicle to everything, V2X) system, a device in a device-to-device (D2D) system, a device in a machine type communication (machine type communication, MTC) system, a device in a side-link communication, or the like. Various handheld devices, vehicle mounted devices, wearable devices, computing devices, or other processing devices connected to a wireless modem may be included with the wireless communication functionality. The terminal may be a Mobile Station (MS), a subscriber Unit (UE), a User Equipment (UE), a cellular phone (cellular phone), a cordless phone, a session initiation protocol (session initiation protocol) phone, a wireless local loop (wireless local loop, WLL) station, a smart phone (smart phone), a wireless data card, a personal digital assistant (personal digital assistant, PDA) computer, a tablet, a wireless modem (modem), a handheld device (handset), a laptop (laptop computer), a machine type communication (machine type communication, MTC) terminal, a terminal device in a 5G network or a network after 5G or a public land mobile network (public land mobile network, PLMN) with an extended reality (XR), virtual Reality (VR) function, a chip or a device or a module, etc., which is not limited to the present application.

The network device in the embodiment of the present application mainly refers to a base station, which is also called a wireless access point, a transceiver station, a relay station, a cell, a transceiver point, an evolved node b, a new generation base station, a Road Site Unit (RSU), etc., which is not limited in the embodiment of the present application.

In V2X communication systems, transmissions between terminals, between vehicles and terminals, and between network devices/base stations and terminals/vehicles are included. The vehicle-mounted terminal needs to be kept connected with a network to obtain some configuration information, and also needs to be kept connected with other vehicle-mounted terminals to realize vehicle-mounted communication. The connection between the in-vehicle terminal device and the base station is uplink and downlink, and the connection between the in-vehicle terminal device is Sidelink (SL). Side-link communications over unlicensed spectrum include transmissions between network devices, transmissions between terminals, and transmissions between network devices/base stations and terminals.

Some terms related to embodiments of the present application are explained below.

(1) Physical sidelink control channel (physical sidelink control channel, PSCCH)

The PSCCH carries first-stage side-link control information (sidelink control information, SCI). In the time domain, the PSCCH occupies two or three orthogonal frequency division multiplexing (orthogonal frequency division multiplexing, OFDM) symbols within a slot starting from the second sidelink symbol, whether two or three symbols are configured or preconfigured by the base station. In the frequency domain, the physical resource blocks (physical resource block, PRBs) carrying the PSCCH start from the lowest PRB of the lowest subchannel of the associated physical sidelink shared channel (physical sidelink shared channel, PSSCH), and the number of PRBs occupied by the PSCCH does not exceed the number of PRBs included in one subchannel in the resource pool. The PSCCH consists of {10,12,15,20,25} PRBs, and a specific value is indicated by sl-FreqResourceSCCH-r 16. The number of PRBs included in the sub-channel includes {10,12,15,20,25,50,75,100}, and the specific value is indicated by sl-SubchannelSize-r 16.

As shown in fig. 1, a schematic diagram of the channel structure of the next slot following the standard cyclic prefix (normal cyclic prefix, NCP) is shown. Wherein the next slot in NCP comprises 14 symbols. The time slot includes PSFCH resources.

As shown in fig. 2, a schematic diagram of the channel structure of the next slot in the extended cyclic prefix (extended cyclic prefix, ECP) is shown. Wherein the next slot in the ECP comprises 12 symbols. The time slot includes PSFCH resources.

(2) Physical sidestream shared channel (physical sidelink shared channel, PSSCH)

The PSSCH carries the second stage SCI and data. In the time domain, when one slot does not include PSFCH resources, there are 12 symbols for carrying PSSCH; when one slot includes PSFCH resources, there are 9 symbols for carrying the PSSCH. In the frequency domain, PSSCH occupies consecutive L _subCh Sub-channels. In addition, in one slot, the first OFDM symbol duplicates information transmitted on the second symbol for automatic gain control (automatic g)ain control，AGC)。

(3) Physical sidelink feedback channel (physical sidelink feedback channel, PSFCH)

The PSFCH carries feedback information. Within a slot that includes resources of the PSFCH, the penultimate OFDM symbol and the third OFDM symbol carry the PSFCH. The signal transmitted on the third last symbol is a repetition of the signal transmitted on the second last symbol for the receiving UE to make AGC adjustments. The PSFCH resources are periodically configured within the resource pool, such as n=0, 1,2,4. Where n=0 indicates that the PSFCH resource is not included in the resource pool, and the HARQ function is disabled at this time; n=2 means that one slot out of every 2 slots in the resource pool includes the PSFCH resource. As shown in fig. 3, a schematic diagram of periodically configured PSFCH resources is shown.

(4) Guard period (GAP) symbol

The UE may receive the PSSCH and the transmit PSSCH in two consecutive slots, respectively, or the UE may receive the PSSCH and the transmit PSFCH in the same slot, respectively, or the UE may receive the PSFCH and the transmit PSFCH in the same slot, respectively. Therefore, an additional GAP symbol is required to be added for the UE's transception switching after the PSSCH and after the PSFCH symbol. In addition, as long as there may be a conversion of receiving transmission or a conversion of transmitting to receiving in the terminal apparatus in the time domain, a GAP of transmitting-receiving conversion is required.

In addition, in the side-link (sidelink in unlicensed band, SL-U) of unlicensed spectrum, transmission in sub-channel units may be supported in the frequency domain, or transmission in an interleaved (interlace) manner may be supported. That is, the basic unit of frequency domain resource allocation is a subchannel or an interlace. In the embodiment of the present application, the frequency domain unit of the sidelink resource is a subchannel or an interlace.

(5) SCI format

In NR sidestream communications, the SCI comprises a first level SCI carried on a PSCCH channel and a second level SCI carried on a PSSCH channel.

In new wireless vehicle communication (new radio vehicle to everything, NR-V), the first stage SCI includes a format, SCI format 1-A.

The SCI format 1-a includes fields of: priority value, frequency domain resource allocation, time domain resource allocation, resource reservation period, demodulation reference signal (demodulation reference signal, DMRS) pattern, format of second level SCI, beta offset value (beta-offset) indication, DMRS port number indication, modulation and coding scheme (modulation and coding scheme, MCS), MCS table indication, PSFCH overhead indication, reserved bits.

The second level SCI in NR-V includes two formats, SCI format 2-A and SCI format 2-B.

The SCI format 2-a includes fields of: hybrid automatic repeat request (hybrid automatic repeat request, HARQ) process number, new packet indication (new data indicator, NDI), redundancy version (redundancy version, RV), source identification (source ID), destination identification (destination ID), HARQ feedback enable/disable indication, broadcast type indication (cast type indicator), channel state information (channel state information, CSI) request.

The SCI format 2-a includes fields of: HARQ process number, NDI, RV, source ID, destination ID, HARQ feedback enable/disable indication, zone Identity (zone ID), communication distance requirement (communication range requirement).

(6) Occupied channel Bandwidth (occupied channel bandwidth, OCB)

According to the legal requirements, when channels are occupied on unlicensed spectrum, the following requirements are satisfied. In short, when channel occupancy is performed in the unlicensed spectrum, the occupied channel bandwidth needs to reach 80% or more than 80% of the entire channel bandwidth. Where the channel bandwidth is typically based on 20 MHz. Temporary occupation below 80% of the channel bandwidth is allowed, but a minimum of 2MHz. Occupancy does not require continuity, e.g., occupies non-continuous frequency domain resources, but the span between the occupied first and last frequency domain resources meets the requirement of 80% or more of the channel bandwidth, also considered to meet the OCB requirement.

(7) Time of transmission/reception conversion

In the side uplink communication, the transmission/reception transition time refers to a time required for one terminal device to switch from the reception state to the transmission state, that is, a time required for the terminal device to switch from the transmission state to the reception state. The principle is the same as that of GAP.

To facilitate an understanding of embodiments of the present application, a hybrid automatic repeat request (hybrid automatic repeat request, HARQ) technique and listen-before-talk (LBT) technique are briefly described.

(1) HARQ technique

HARQ is a technique formed by combining a forward error correction code (forward error correction, FEC) with an automatic repeat request (automatic repeat request, ARQ). The FEC technology can automatically correct transmission error codes by adding redundancy error correction codes into transmission code columns under a certain condition, and reduce Bit Error Rate (BER) of received signals. ARQ recovers an erroneous message by a receiving end requesting a transmitting end to retransmit the erroneous data message, which is one of methods for handling errors caused by a channel in communication. The transmitting end transmits data to the receiving end, the receiving end feeds back an Acknowledgement (ACK) message to the transmitting end if the receiving end successfully decodes the data, and feeds back a negative acknowledgement (negative acknowledgement, NACK) message to the transmitting end if the receiving end does not successfully decode the data.

In NR-V, both unicast and multicast support HARQ feedback. The HARQ feedback mode in unicast is that if the receiving end successfully decodes the data, an ACK message is fed back to the transmitting end, and if the receiving end does not successfully decode the data, a NACK message is fed back to the transmitting end. Two HARQ feedback modes exist in multicast, one is the same as the feedback mode in unicast, if the receiving end successfully decodes the data, the ACK message is fed back to the transmitting end, and if the receiving end does not successfully decode the data, the NACK message is fed back to the transmitting end; another feedback method is a feedback method in which if the receiving end successfully decodes the data, no feedback information is sent to the transmitting end, and if the receiving end does not successfully decode the data, a NACK message is fed back to the transmitting end, that is, only negative acknowledgement (NACK only).

(2) LBT technique

For the wireless communication technology on the unlicensed frequency band, since the availability of channels on the unlicensed frequency band cannot be guaranteed at any time, LBT is a channel access mechanism, and the same spectrum resources can be effectively shared between the wireless local area networks. LBT requires that the channel be monitored prior to transmitting data, clear channel assessment (clear channel assessment, CCA) be performed, and data transmission be performed with the channel clear ensured.

The channel access process of unlicensed spectrum wireless communication (new radio in unlicensed band, NR-U) is mainly a process of acquiring a channel access opportunity by a standardized base station or UE in an unlicensed frequency band, and performing data transmission. Specifically, there are two kinds of channel access modes (channel access mode), including a frame-based device (Frame Based Equipment, FBE) and a load-based device (Load based Equipment, LBE), which access mode is used for radio resource control (radio resource control, RRC) signaling configuration in the resource pool. LBE is an important channel assessment and access mechanism in NR-U, and is the key to whether NR-U can fairly coexist with other systems. The FBE mechanism is mainly suitable for ensuring that no wireless fidelity (Wi-Fi) exists, and only a single NR-U network exists in a geographic area using a frequency band, such as an independently deployed factory environment.

The class of LBT is classified into 4 classes, according to the degree of difficulty to ease of access to the channel:

type1 (Type 1): random back-off LBT for non-fixed length contention window, also known as Type1 channel access procedure. After detecting that the channel is occupied or the maximum transmission time is reached, the transmitting end enters a contention window. The length of the contention window may be changed. Type1LBT consists of two parts, length T _d Channel detection T of (2) _d ＝T _f +m _P *T _S1 When T _d And after all detection time is idle, entering a second part of cyclic detection. The loop detection is based on the loop process of the counter N. N has an initial value of 0 to CW _p Random numbers in between. As shown in fig. 4, a schematic diagram of the first part in Type1LBT is shown.

Type2 (Type 2): also known as Type2 channel access procedure.

Type 2A (Type 2A): within a transmit-receive transition time (gap) of 25us, there are 2 detection windows of 9us, and the length of the detected basic unit is 9us. For a certain channel, if the detection results of two detection windows are idle, it can be understood that the detection power of at least 4us is lower than the energy detection threshold, the channel is determined to be idle, and data can be sent on the channel. In SL communication, the transmission/reception switching time is a preparation time required for transmission/reception switching or transmission/reception switching.

Type 2B (Type 2B): within 16us gap, the detection time is at least 5us, and there is at least 4us detection channel idle.

Type 2C (Type 2C): in the case where the gap is less than 16us, the LBT direct access channel is not required, and only 584us can be used for transmission by the device accessing the channel. Wherein, type 2C has no LBT, and some regions and countries do not mandate that LBT mechanisms be implemented on unlicensed bands. As shown in fig. 5, a Type2LBT schematic is shown.

The base station initialized channel occupancy time (channel occupy time, COT) may be shared with the UE, as well as the UE initialized COT may be shared with the base station.

In order to facilitate understanding of the embodiments of the present application, the following description of the prior art related to the embodiments of the present application is provided for simplicity.

A time slot including a PSFCH resource is associated with one or more time slots for transmitting data, wherein the time slot including the PSFCH resource may be referred to as a PSFCH time slot and the time slot for transmitting data may be referred to as a PSSCH time slot. The meaning of the association is: HARQ information corresponding to data transmitted in the one or more PSSCH slots is fed back in the PSFCH slot. The PSFCH resources are included in the PSFCH slot, and thus the UE may transmit or receive HARQ using the PSFCH resources. As shown in fig. 6, a schematic diagram of four PSSCH slots associated with one PSFCH slot is shown.

The minimum value of the feedback timing of the PSSCH slot to the PSFCH slot is K, which is 2 or 3. If the UE receives the PSSCH in the slot n, the UE feeds back HARQ information in the slot n+k and the first slot including the PSFCH resource among the slots after the slot n+k. Thus, after the PSSCH slot to PSFCH slot to feedback timing is determined, the PSSCH slot associated with the PSFCH slot is also determined.

Currently, a terminal device determines resources of a PRB for transmitting HARQ information according to a subchannel and a slot occupied by a PSSCH. Specifically, assume (1): the PSFCH resources are configured periodically, with a period of 2, and it can be understood that one slot of every two slots includes a PSFCH resource; suppose (2): k=2, the ue receives the PSSCH in the slot n, and transmits HARQ information in the first slot including the PSFCH resource among slots after the slot n+2.

As shown in fig. 7, an association relationship between PSSCH slots for transmitting data and PSFCH slots for feeding back HARQ information is shown. The Transport Blocks (TBs) transmitted in time slot n and time slot n+1 each feed back the corresponding HARQ in time slot n+3. Each slot including the PSFCH resource corresponds to 2 slots for transmitting TBs. The sub-channels included in the 2 slots for transmitting TBs are each allocated at least one PRB resource for transmitting HARQ. In fig. 7, the slot n includes 2 sub-channels, the slot n+1 includes 2 sub-channels, and there are 4 sub-channels in total, and the PRBs configured to be used for transmission HARQ are 12, so that each sub-channel in each slot corresponds to 3 PRBs.

In R16NR-V, PSFCH occupies only one PRB and does not meet OCB requirements on unlicensed spectrum. In order to meet the OCB requirement, the transmission form of the PSFCH may be changed, possibly resulting in insufficient PSFCH resources, and the mapping rule of the sub-channel for transmitting data in each slot in Rel-16 to the PSFCH resources for transmitting HARQ information is not applicable.

To facilitate an understanding of embodiments of the present application, a system architecture and application field Jing Jinhang to which embodiments of the present application are applicable are described below.

The embodiment of the application is suitable for the wireless communication technology on the authorized spectrum and the wireless communication technology on the unlicensed spectrum. Communication systems suitable for use with the present application include communication systems associated with terminals, such as, for example, terminal-to-terminal communication, vehicle-to-terminal communication, and network device/base station-to-terminal/vehicle communication.

Taking the V2X scenario as an example, the vehicle-mounted terminal needs to be kept connected with the network to obtain some configuration information, and also needs to be kept connected with other vehicle-mounted terminals to realize vehicle-mounted communication. As shown in fig. 8, a schematic diagram of a V2X system is shown. For XR, VR, MR scenarios, embodiments of the application are also applicable. The embodiment of the application is applicable to the communication of a side link, and the side link can be also understood as a side link or a direct link, but is not limited to a specific scene. As shown in fig. 9, a schematic diagram of communication between UEs over a side-link is shown.

The embodiment of the application provides a communication method which can improve the reliability of data transmission. As shown in fig. 10, a schematic flow chart interaction diagram of a method 1000 of communication according to an embodiment of the present application is shown. It should be understood that the transport block in the embodiment of the present application may be understood as data, and data may be understood as a transport block. The field in the embodiment of the present application may be understood as a field or S bits, where S is an integer greater than or equal to 1.

The first terminal device sends 1010 first indication information to the second terminal device, the first indication information being used to indicate at least one PSFCH time domain resource within the COT. Correspondingly, the second terminal device receives the first indication information from the first terminal device.

The first indication information may be used to indicate at least one time slot within the COT that includes a PSFCH time domain resource, i.e., a PSFCH time slot. Optionally, the first indication information is used to indicate symbols including PSFCH time domain resources in the COT, where one PSFCH time domain resource occupies at least one symbol. That is, each of the at least one PSFCH time domain resource corresponds to one slot, respectively, or each of the at least one PSFCH time domain resource corresponds to at least one symbol, respectively. Alternatively, the time domain resource may be understood as a time unit, for example, the time domain resource may be a time slot, a symbol, a frame, a subframe, an absolute time, or other time units, which is not limited herein.

Alternatively, the PSFCH time domain resource may be a time domain resource for transmitting the PSFCH in a slot including the PSFCH resource.

Illustratively, the PSFCH time domain resource may be a PSFCH slot, which may be a slot including a PSFCH resource or a slot including a PSFCH time domain resource.

Illustratively, since the start position of the COT is dynamic and the end position of the COT is also dynamic, the time slot or a portion of the symbols in the time slot may be included within the COT. When a partial symbol in a slot is included in the COT, the partial symbol in the slot may also be understood as one PSFCH time domain resource, i.e. the partial symbol in the slot may include a PSFCH resource.

Alternatively, the first indication information may be carried in the first-stage SCI, may be carried in the second-stage SCI, and may also be carried in a Control Element (CE) of a media access control layer (medium access control, MAC), or carried in the SCI, or carried in a MAC sub-header (header).

Optionally, the first indication information is used to indicate at least one PSFCH time domain resource in the COT, which may be understood as that the first indication information is only used for at least one PSFCH time domain resource in the COT, or the first indication information is used to indicate information including at least one PSFCH time domain resource in the COT. In other words, the first indication information is the COT indication information, or the COT indication information includes the first indication information, or the first indication information is one field of the COT indication information.

The first terminal device sends first indication information to the second terminal device, where the first indication information may be COT indication information, and is configured to indicate at least one of the following: the start position of the COT, the length of the COT, the resource occupancy within the COT, at least one time slot comprising PSFCH resources. The resource occupation in the COT may include resources used by the first terminal device in the COT and resources shared to other terminal devices.

Illustratively, the first indication information is for indicating at least one of: the method comprises the steps of sharing time-frequency resources used by a first terminal device in COT, sharing identification information of the terminal device, sharing the time-frequency resources used by the terminal device, and at least one time slot comprising PSFCH resources. Wherein the frequency domain resource in the time-frequency resource used by the first terminal device or the shared terminal device may be indicated by at least one of: the starting position and the length of the frequency domain resource unit can be staggered, sub-channels or PRB or RE (Resource Element), wherein the starting position can be the frequency domain resource unit with the lowest frequency domain or the frequency domain resource unit with the highest frequency domain; such as the index and number of start interlaces interlaced in the frequency domain; either full band/bandwidth/partial bandwidth/resource pool/full frequency domain resources of one or more channels or full frequency domain resources for LBT. The time domain resources in the time-frequency resources used by the first terminal device or the shared terminal device may be indicated by one or more sets of time domain start positions and time domain lengths. The time domain length may be a symbol, slot, frame, subframe, absolute time, or other unit of time, without limitation. The identification information of the shared terminal device includes identification information of the target terminal device (destination ID) and/or identification information of the source terminal device (source ID). In one implementation, the first terminal device performs Type1 LBT, and may initialize a COT after the LBT is successful. The length of the COT is related to at least one of a priority value and a channel access priority level (Channel access priority class, CAPC) included in the SCI. The CAPC has a range of values of 1,2,3, and 4, with smaller values indicating higher priority levels. The priority value included in the SCI is the value of the priority field included in the SCI, and the value may be 1,2,3,4,5,6,7,8.

Illustratively, the COT length is related to CAPC, and the COT length determined from CAPC is shown in Table 1.

TABLE 1

CAPC	COT length
		1	2ms
2	4ms
		3	6ms or 10ms
4	6ms or 10ms

Illustratively, the COT length is associated with a priority value in the SCI, and the COT length determined from the priority in the SCI is shown in Table 2.

TABLE 2

Illustratively, the first indication information is for indicating at least one of the candidate PSFCH time domain resources within the COT of the first terminal device. The at least one PSFCH time domain resource indicated by the first indication information belongs to candidate PSFCH time domain resources within the COT. In other words, the manner in which the first indication information indicates the at least one PSFCH time domain resource within the COT may be that the first indication information indicates whether the candidate PSFCH time domain resource within the COT includes the PSFCH resource.

Illustratively, the first indication information may be used to indicate whether each candidate PSFCH time domain resource within the COT of the first terminal device is a certain PSFCH time domain resource of the at least one PSFCH time domain resource.

The first indication information may be used to indicate whether the candidate PSFCH time domain resources within the COT of the first terminal device are PSFCH time domain resources, for example.

Optionally, the first terminal device determines at least one PSFCH time domain resource according to at least one of a start position of the COT, a COT length, and a PSFCH configuration period. The PSFCH configuration period may also be understood herein as a candidate PSFCH resource configuration period, or a configuration period of PSFCH resources. The PSFCH configuration period may be configured, or pre-defined. The PSFCH configuration period may be 0,1,2,4, or any positive integer. There is no limitation in this regard. Here, the first terminal device may determine time domain resources possibly including PSFCH resources within the COT according to the start position of the COT, the COT length, and the PSFCH configuration period, and in combination with the indication information indicating the time domain resources possibly including the PSFCH resources, the first terminal device determines the time domain resources including the PSFCH resources.

In one implementation, the PSFCH resources are periodically configured or pre-configured in a set of time-frequency resources. That is, the PSFCH resources are periodically configured at the system level. That is, the locations of the time domain resources, which may include the PSFCH resources, determined by different terminal devices are the same in the set of time-frequency resources. The set of time-frequency resources is herein a pool of resources, a spectrum, one or more channels, a bandwidth, a partial bandwidth, a set of resource blocks, etc., without limitation. The time domain resources that may include the PSFCH resources may be referred to as candidate PSFCH time domain resources (or candidate PSFCH resources). The candidate PSFCH time domain resources do not necessarily include PSFCH resources, but potentially include PSFCH resources or have the potential to include PSFCH resources. Whether the candidate PSFCH time domain resources actually comprise PSFCH resources needs to be configured or indicated, that is, the PSFCH resources depend on the configuration or indication. The candidate PSFCH time domain resources indicated to include the PSFCH resources may be used for transmission of HARQ information, and the candidate PSFCH time domain resources not indicated to include the PSFCH resources may not be used for transmission of HARQ information. The PSFCH configuration period may be 0,1,2,4, or any positive integer. There is no limitation in this regard.

It should be appreciated that the candidate PSFCH time domain resources are periodically configured in a set of time-frequency resources, which may be spectrum, resource pool, channel, bandwidth, partial bandwidth, or otherwise, without limitation herein. Each terminal device within the set of time-frequency resources is eligible to use the candidate PSFCH time-domain resources. Which terminal device uses a particular candidate PSFCH time domain resource depends on which terminal device the channel is occupied or shared by.

As shown in fig. 11, candidate PSFCH time domain resources included in the COT when the PSFCH time domain configuration period is 2 are shown. The length of the COT is 5 time slots, and the time slots of the candidate PSFCH time domain resources included in the COT are time slot n, time slot n+2 and time slot n+4. The candidate PSFCH slot may be understood as a slot determined according to the PSFCH configuration period that may include PSFCH time domain resources. I.e. the COT comprises 3 candidate PSFCH slots. The first indication information may occupy 3 bits, and the status value of 3 bits indicates whether the candidate PSFCH time domain resources included in the time slot n, the time slot n+2, and the time slot n+4 include the PSFCH time domain resources, respectively. Specifically, the 1 bit includes two state values, and the first state value indicates that the corresponding candidate PSFCH time domain resource includes a PSFCH time domain resource (i.e., the candidate PSFCH time domain resource is a PSFCH time domain resource); the second state value indicates that the corresponding candidate PSFCH time domain resource does not include a PSFCH time domain resource (i.e., the candidate PSFCH time domain resource is not a PSFCH time domain resource). For example, "0" indicates that the candidate PSFCH time domain resource is not a PSFCH time domain resource, and "1" indicates that the candidate PSFCH time domain resource is a PSFCH time domain resource. Then a 3 bit of "010" indicates that slot n+2 includes PSFCH time domain resources, slot n, and slot n+4 does not include PSFCH time domain resources.

In an example, the first terminal device may determine whether the candidate PSFCH slot is a PSFCH slot according to whether the data in the COT enables HARQ feedback, whether HARQ information corresponding to the data in other COTs is transmitted in the COT.

The side-link communication includes three communication traffic types, unicast, multicast and broadcast, the broadcast traffic does not support HARQ feedback, and the unicast traffic and the multicast traffic support HARQ feedback. For unicast and multicast, 1 bit (HARQ enable/disable field) is used in the SCI (which may be the second level SCI) to indicate whether HARQ is disabled, that is, whether the TB scheduled by the SCI needs feedback HARQ information. When the SCI indicates that its scheduled TB does not need feedback HARQ information, the UE receiving the TB does not need feedback HARQ information. Thus, in unlicensed spectrum, configured or preconfigured candidate PSFCH resources may not be used and the COT may be interrupted accordingly. Therefore, by indicating which candidate PSFCH time domain resources are PSFCH time domain resources in all candidate PSFCH time domain resources in the COT through the first indication information, interruption of the COT can be avoided, thereby improving reliability of data transmission. It should be appreciated that candidate PSFCH time domain resources that are not PSFCH time domain resources may be used for transmitting data/transport blocks. That is, the first terminal device determines that the candidate PSFCH time domain resource is not a PSFCH time domain resource, and the candidate PSFCH time domain resource is used for transmitting data. For example, when the candidate PSFCH slot does not include PSFCH resources, the symbols included in one slot are used to transmit data, and the data is rate matched over the symbols included in that slot.

In connection with the above-described limitation of the feedback timing from PSSCH slot to PSFCH slot shown in fig. 11, the feedback timing from PSSCH slot to PSFCH slot is greater than 0, and data transmission in the candidate PSFCH slot n in this slot cannot be fed back, so if the slot n includes a PSFCH resource, the PSFCH resource can only be used to transmit HARQ information corresponding to data in other COTs, which are one or more COTs different from the COTs initialized by the first terminal device. If the first terminal device does not have HARQ information within the other COT to send, it may indicate that slot n does not include PSFCH resources. The indication mode improves the flexibility of PSFCH resource allocation. Also, since HARQ for data transmission in the side uplink may be disabled, when PSFCH resources in one candidate PSFCH slot are not used, that is, HARQ for data transmission in a PSSCH slot (slot for transmitting data) corresponding to the candidate PSFCH slot is disabled, it may cause the COT to be accessed by other devices, thereby causing the COT to be interrupted. The PSFCH resource indication mode can avoid COT interruption caused by that PSFCH symbols are not used, and further improves the flexibility of PSFCH resource configuration.

For example, the first terminal device performs Type1 LBT, and accesses the channel after the LBT is successful. Since LBT success is a probabilistic event, the moment of LBT success is uncertain. The difference in the start position of the COT, the length of the COT, and the PSFCH configuration period may result in the difference in the candidate PSFCH time domain resources included in the COT. As shown in fig. 12, candidate PSFCH time domain resources included in different COTs when the PSFCH configuration period is 2 are shown. Wherein, COT1 comprises 5 time slots, and the time slots of the candidate PSFCH time domain resource are time slot n, time slot n+2 and time slot n+4; the COT2 comprises 4 time slots, and the time slots of the candidate PSFCH time domain resources are time slots n+2 and time slots n+4; the COT3 includes 5 time slots, and the time slots of the candidate PSFCH time domain resources are time slot n+2, time slot n+4 and time slot n+6.

In another implementation, the PSFCH time domain resource is configured or indicated by the first terminal device. Within the COT of the first terminal device, the time slots comprising the PSFCH time domain resources may be periodic or aperiodic. In particular configured or indicated by the first terminal device. If the PSFCH slots in the COT are periodically configured, the configuration period is N, where N may be 0, 1, 2 or 4, or any other positive integer, which is not specifically limited in the present application. The configuration of the PSFCH slots at this time depends on the COT. The starting position and length of the COT are different and the time slots comprising the PSFCH resources may be different.

In this implementation, the first indication information may indicate at least one PSFCH time domain resource within the COT by indicating time domain resources (time slots) that include the PSFCH resource within the COT.

Illustratively, the first indication information may be used to indicate at least one time slot within the COT that includes a PSFCH resource or to indicate at least one PSFCH time slot within the COT.

Illustratively, the first indication information may be used to indicate whether each time slot within the COT includes a PSFCH time domain resource or whether each time slot within the COT is a PSFCH time slot. For example, the COT length is N, and N bits are used to indicate whether PSFCH time domain resources are included or not included in each slot. A COT length of N is understood to mean that the number of slots included in the COT is N, and if a part of symbols of one slot are included in the COT, the number is recorded as one slot. Each bit has two status values, one for indicating that the slot includes PSFCH time domain resources and the other for indicating that the slot does not include PSFCH time domain resources. The two state values may be "0" and "1", respectively. It should be appreciated that after determining the PSFCH time-domain resources within the COT, one or more PSSCH slots associated with the PSFCH slot may be determined based on the PSSCH slot-to-PSFCH slot feedback timing. Alternatively, the at least one PSFCH time domain resource may be a PSFCH time domain resource for the first terminal device to transmit HARQ information, or a PSFCH time domain resource for the first terminal device to receive HARQ information.

Alternatively, the at least one PSFCH time domain resource may be a PSFCH time domain resource for the first terminal device to transmit HARQ information of data in the current COT, or a PSFCH time domain resource for the first terminal device to transmit HARQ information of data in other COTs, or a PSFCH time domain resource for the first terminal device to receive HARQ information of data in the current COT, or a PSFCH time domain resource for the first terminal device to receive HARQ information of data in other COTs. The other COTs are COTs that are different from the current COT. The other COTs may or may not be first terminal device initialized.

And 1020, the first terminal equipment sends the first transport block to the second terminal equipment in the COT. The first transport block may be understood as first data. The first transport block may be carried in the PSSCH. When two TBs are carried in one PSSCH, the first transport block may be one of the two TBs. Correspondingly, the second terminal device receives the first transport block from the first terminal device within the COT.

1030, the second terminal device sends, to the first terminal device, first HARQ information corresponding to the first transport block, in a first PSFCH time domain resource of the at least one PSFCH time domain resource. The first terminal equipment receives first HARQ information corresponding to a first transmission block from the second terminal equipment in a first PSFCH time domain resource in the at least one PSFCH time domain resource, wherein the first HARQ information occupies at least one interlace (interlace) which comprises at least one resource block. It should be appreciated that the time slot including the first PSFCH time domain resource is associated with the PSSCH time slot in which the first transport block is transmitted, the time slot including the first PSFCH time domain resource being the first time slot including the PSFCH resource that is M time slots apart after the transmission of the first transport block.

To meet the OCB requirement, the transmission of HARQ information may support the form of PRB-based interleaving. 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. Bandwidth part/channel/resource pool/spectrum/part bandwidth/resource block set i and interleaved resource blocks in interlace mAnd 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 set i of bandwidth part/channel/resource pool/spectrum/part bandwidth/resource block is not less than 10. The number of PRBs in the interlaces corresponding to the different subcarrier spacings is shown in table 3.

TABLE 3 number of PRBs in interleaving

μ	M
		0	10
1	5

As shown in fig. 13, a schematic illustration of interleaving is shown. 20M bandwidth, 30kHz, the frequency domain includes 51 PRBs. Assuming that the frequency domain interval between two adjacent PRBs in one interlace is 5 PRBs, as shown in fig. 13, the inter #0 includes PRB indexes of 0,5, 10, 15, 20, 25, 30, 35, 40, 45, 50; one interface contains 10 or 11 PRBs; the 51 PRBs include 5 interlaces in total. Alternatively, the PSFCH may be transmitted in an interleaved form, or may be transmitted in the form of resource blocks. The PSFCH may be configured or indicated by the staggered or resource block transmissions. Such as network device configured or preconfigured PSFCH transmissions using an interleaved form or resource block form. Or in SCI indicates that the PSFCH is transmitted using an interleaved form or a resource block form. The present application is not particularly limited thereto.

Optionally, the second terminal device sends a second transport block to the first terminal device in the COT; the first terminal device receives a second transmission block from a second terminal device in the COT; the first terminal equipment sends second HARQ information corresponding to the second transmission block to the second terminal equipment in a second PSFCH time domain resource in the at least one PSFCH time domain resource, wherein the second HARQ information occupies at least one interlace which comprises at least one resource block; correspondingly, the second terminal device receives second HARQ information corresponding to a second transport block from the first terminal device. It should be appreciated that the time slot comprising the second PSFCH time domain resource is associated with the PSSCH time slot receiving the second transport block, the time slot comprising the second PSFCH time domain resource being the first time slot comprising the PSFCH resource separated by M time slots after receiving the second transport block.

The PSFCH time domain resources include two types, one for the first terminal device to transmit HARQ information and the other for the first terminal device to receive HARQ information, for two purposes.

Optionally, the first indication information is used to indicate whether the PSFCH time domain resource of the at least one PSFCH time domain resource is used for the first terminal device to transmit HARQ information or to receive HARQ information. For example, the first indication information includes 1 bit, and the 1 bit is used to indicate whether the PSFCH time domain resource is used for the first terminal device to transmit HARQ information or to receive HARQ information.

Optionally, the first indication information is used to indicate not only the at least one PSFCH time domain resource, but also whether the PSFCH time domain resource of the at least one PSFCH time domain resource is used for the first terminal device to transmit HARQ information or to receive HARQ information. For example, the first indication indicates L PSFCH time domain resources within the COT, wherein L1 of the L PSFCH time domain resources are used for the first terminal device to transmit HARQ information, and L2 are used for the first terminal device to receive HARQ information. Wherein l1+l2=l.

Optionally, the first indication information is used to indicate that the PSFCH time domain resource in the at least one PSFCH time domain resource is the first terminal device or other terminal device for sending HARQ information or for receiving HARQ information. That is, other terminal devices may also transmit data in the COT initialized by the first terminal device, and receive corresponding HARQ information. The application is not limited in this regard.

Optionally, the first indication information is used for indicating at least one PSFCH time domain resource in the COT, where the PSFCH time domain resource includes a time domain resource used by the first terminal device for sending HARQ information and/or a time domain resource used by the first terminal device for receiving HARQ information. For example, one time slot may include a time domain resource for the first terminal device to transmit HARQ information, or one time slot may include a time domain resource for the first terminal device to receive HARQ information, or one time slot may include a time domain resource for the first terminal device to transmit HARQ information and a time domain resource for the first terminal device to receive HARQ information.

Optionally, the PSFCH time domain resource includes a time domain resource used by the first terminal device to send HARQ information corresponding to data transmitted in the current COT. That is, the PSFCH time domain resource includes a time domain resource used by the first terminal device to send HARQ information in the COT, where the HARQ information in the COT is HARQ information corresponding to data transmitted in the COT; or, the PSFCH time domain resource includes a time domain resource used by the first terminal device to send HARQ information corresponding to data transmitted in other COTs. That is, the PSFCH time domain resource includes a time domain resource used by the first terminal device to send HARQ information in other COTs, where the HARQ information in other COTs is HARQ information corresponding to data transmitted in other COTs; other intra-COT HARQ information may also be understood as HARQ information fed back across the COT; wherein the other COT and the current COT are different COTs.

The first indication information is used to indicate that the first PSFCH time domain resource is used for the first terminal device to receive the first HARQ information, and the second PSFCH time domain resource is used for the first terminal device to transmit the second HARQ information.

Optionally, the first terminal device determines the PSSCH slot associated with the PSFCH time domain resource according to whether the PSFCH time domain resource is used by the first terminal device to receive HARQ information or to transmit HARQ information.

Optionally, the first terminal device determines a PSSCH slot associated with the PSFCH time domain resource according to at least one of:

the PSFCH time domain resource is used for transmitting HARQ information;

the PSFCH time domain resource is used for receiving the HARQ information;

the PSFCH time domain resource is used for sending HARQ information corresponding to the data transmitted in the current COT;

the PSFCH time domain resource is used for sending HARQ information corresponding to data transmitted in other COTs;

the PSFCH time domain resource is used for receiving HARQ information corresponding to data transmitted in the current COT;

the PSFCH time domain resource is used for receiving HARQ information corresponding to data transmitted in other COTs;

the PSSCH time slot is used for the first terminal device to send data;

the PSSCH time slot is used for other terminal devices to send data, and the other terminal devices share COT internal resources initialized by the first terminal device;

Feedback timing of PSSCH slots to PSFCH slots.

Illustratively, in determining the PSSCH time domain resources associated with a PSFCH slot, it is necessary to determine whether the PSFCH slot is used by a terminal device to receive HARQ information or to transmit HARQ information. As shown in fig. 14, a schematic diagram of determining PSSCH time domain resources associated with a PSFCH slot is shown. For example, UE1 initializes a COT including 6 slots therein, wherein PSSCH slot 1, PSSCH slot 4, PSSCH slot 5, and PSSCH slot 6 are used by UE1, and PSSCH slot 2 and PSSCH slot 3 are shared to UE2 and UE3, respectively. PSFCH time-domain resources included in PSFCH time slot 1 and PSFCH time slot 3 are used for UE1 to transmit HARQ information, and PSFCH time-domain resources included in PSFCH time slot 2 are used for UE1 to receive HARQ information. UE1 may be a first terminal device in the embodiment of the present application, and UE2 or UE3 may be a second terminal device in the embodiment of the present application.

If the PSSCH slot to PSFCH slot feedback timing K is equal to 2, for PSSCH slot 2 (PSFCH slot 1), there is no associated PSSCH slot and the data currently transmitted in the COT cannot be fed back in PSFCH slot 1. The PSFCH time domain resources included in the PSFCH slot 1 may be used by the UE1 to transmit past HARQ information. The past HARQ information may be understood as HARQ information corresponding to data transmitted in other COTs. The HARQ information to be fed back may also be understood to include HARQ information that is not successfully transmitted in other COTs due to LBT failure or the like, or HARQ information that cannot be transmitted in other COTs because feedback timing from PSSCH slot to PSFCH slot is not satisfied.

PSSCH slot 4 (PSFCH slot 2) is used for UE1 to receive HARQ information, so the PSSCH slot associated with PSFCH slot 2 is the slot where UE1 transmits TBs. Otherwise, assuming that the UE1 receives the data in the timeslot associated with the PSFCH timeslot 2, the UE1 may need to send HARQ information and receive HARQ information in the PSFCH timeslot 2, where there is a potential transmission/reception collision. If K is equal to 2, the PSSCH slot associated with PSFCH slot 2 is PSSCH slot 1, based on the PSSCH slot to PSFCH slot feedback timing.

PSSCH slot 6 (PSFCH slot 3) is used for UE1 to transmit HARQ information, so the PSSCH slot associated with PSFCH slot 3 is the slot where UE1 receives TBs. If K is equal to 2, the PSSCH slot associated with PSFCH slot 3 is PSSCH slot 2 and PSSCH slot 3 according to the PSSCH slot-to-PSFCH slot feedback timing. Since there is no PSFCH slot in the cog that satisfies the PSSCH slot to PSFCH slot feedback timing, UE1 cannot acquire corresponding HARQ information in the current cog, and only the PSFCH slots in the other cog can receive HARQ information of TBs transmitted in PSSCH slot 4, PSSCH slot 5, and PSSCH slot 6.

UE1 sends TB in time slot 1 and receives corresponding HARQ information in time slot 4; UE1 receives data from UE2 and UE3 in time slot 2 and time slot 3, respectively, and transmits corresponding HARQ information to UE2 and UE3 in time slot 6, respectively. Assuming that there is past HARQ information not transmitted, it may be transmitted in slot 2.

In R16NR-V, there is no distinction between whether the PSFCH time domain resource is used for transmitting HARQ information or receiving HARQ information, so that a transmission/reception collision of HARQ information occurs, and when the transmission/reception collision of HARQ information occurs, the PSFCH time domain resource is determined to be used for transmitting HARQ information or receiving HARQ information according to the priority of HARQ information. In the scheme, the PSFCH time domain resource is distinguished to be used for transmitting HARQ information or receiving HARQ information, and the use of the PSFCH time domain resource is considered when determining the PSSCH time slot associated with the PSFCH time domain resource, so that the receiving and transmitting conflict of the HARQ information can be avoided, and the reliability of data transmission is improved.

The number of symbols occupied by one PSFCH time domain resource in the at least one PSFCH time domain resource indicated by the first indication information is equal to or greater than 1. That is, the number of symbols occupied by the PSFCH time domain resource in the at least one PSFCH time domain resource is not fixed. That is, the number of symbols occupied by the partial PSFCH time domain resource in the at least one PSFCH time domain resource may be greater than 1, and the number of symbols occupied by the partial PSFCH time domain resource may be equal to 1; alternatively, the number of symbols occupied by all PSFCH time domain resources in the at least one PSFCH time domain resource may be greater than 1; alternatively, the number of symbols occupied by all PSFCH time domain resources in the at least one PSFCH time domain resource may be equal to 1.

Optionally, the first indication information indicates at least one PSFCH slot within the COT, with some PSFCH slots including 2 PSFCH symbols and some PSFCH slots including 1 PSFCH symbol. The previous symbol of the PSFCH symbol is a duplicate of the PSFCH symbol, which is used for AGC adjustment, and the duplicate symbol of the PSFCH symbol used as AGC is not counted as the PSFCH symbol in the present application.

To meet the OCB requirement, the transmission of HARQ information is in the form of PRB-based interleaving. The number of interlaces for transmitting HARQ information in the PSFCH time domain resources including one PSFCH symbol is limited, and the PSFCH time domain resources may not be sufficiently used. Therefore, the PSFCH time domain resource comprises a plurality of PSFCH symbols, so that the normal operation of HARQ can be ensured, and the reliability of data transmission is improved. That is, one PSFCH slot may include one or more symbols for transmitting HARQ information. Here, the PSFCH symbol is a symbol for transmitting HARQ information.

As shown in fig. 15, a schematic diagram of a PSFCH slot structure with a PSFCH time domain resource occupation symbol of 1 is shown, and one PSFCH slot includes 1 symbol for transmitting HARQ information, where blank symbols in the PSFCH slot are symbols occupied by PSCCH and PSSCH. As shown in fig. 16, a schematic diagram of the structure of a PSFCH slot with symbol 2 occupied by four PSFCH time domain resources is shown. Wherein one PSFCH slot includes 2 symbols for transmitting HARQ information, and blank symbols in the PSFCH slot are symbols occupied by PSCCH and PSSCH. It should be understood that one PSFCH slot may also include 3 or more symbols for transmitting HARQ information, which is not limited by the embodiment of the present application. For example, the PSFCH slot includes 3 PSFCH symbols, wherein 1 PSFCH symbol of the 3 PSFCH symbols is used for transmission HARQ, and the other 2 PSFCH symbols of the 3 PSFCH symbols are used for transmission HARQ.

Optionally, the previous symbol of each PSFCH symbol is a replica of the PSFCH symbol, which is an AGC symbol. I.e. if one slot comprises two PSFCH symbols, the previous symbol of each PSFCH symbol is an AGC symbol. Such as the first, third, and fourth cases in fig. 16.

Alternatively, if there are two PSFCH symbols in one PSFCH slot for transmitting HARQ information, the previous symbol of the first PSFCH symbol is an AGC symbol, and the previous symbol of the second PSFCH symbol has no AGC symbol. At this time, the PSFCH symbol has only one AGC symbol, and the transmission power on the two PSFCH symbols is required to be the same. Wherein, the PSFCH symbol is a symbol for transmitting HARQ information. Such as the second case in fig. 16.

Illustratively, a first one of the at least one PSFCH time domain resource occupies a number of symbols greater than 1. Specifically, the first SCI schedules a first transport block, the first SCI indicates that the first transport block is multicast, and the number of symbols occupied by the first PSFCH time domain resource is greater than 1. Since the first transport block is multicast, more PSFCH resources are needed when the first HARQ information corresponding to the first transport block is transmitted, and therefore, the number of symbols occupied by the first PSFCH time domain resources is greater than 1. Wherein, the first symbol in the first PSFCH time domain resource occupation symbol is a public resource, and the rest symbols are resources for transmitting HARQ information corresponding to the multicast data.

Illustratively, a third PSFCH time domain resource of the at least one PSFCH time domain resource occupies a first symbol and a second symbol, the first symbol and the second symbol being used for transmitting HARQ information, or the first symbol and the second symbol being used for receiving HARQ information, wherein the third PSFCH time domain resource comprises the first PSFCH time domain resource or the second PSFCH time domain resource. That is, when the first symbol and the second symbol are used to transmit HARQ information, the third PSFCH time domain resource may include a second PSFCH time domain resource; the third PSFCH time domain resource may include the first PSFCH time domain resource when the first symbol and the second symbol are used to receive HARQ information. Here, the first symbol may be extended to the first time domain resource, and the second symbol may be extended to the second time domain resource. That is, one PSFCH time domain resource includes a first time domain resource that may occupy 1 or more symbols and a second time domain resource that may occupy 1 or more symbols. The number of symbols occupied by the first time domain resource and the second time domain resource may be different. Optionally, the first time domain resource is used for the first terminal device to send HARQ information, and the PSSCH time slot associated with the first time domain resource is a time slot used for the first terminal device to receive data. The second time domain resource is used for the first terminal device to receive the HARQ information, and the associated PSSCH time slot is a time slot for the first terminal device to transmit data. Similarly, the first symbol is used for the first terminal device to send HARQ information, and the PSSCH slot associated with the first symbol is a slot for the first terminal device to receive data. The second symbol is used for the first terminal device to receive HARQ information, and its associated PSSCH slot is a slot for the first terminal device to transmit data. Thus, the conflict of receiving and transmitting PSFCH can be effectively avoided.

In the case that the first symbol and the second symbol occupied by the third PSFCH time domain resource are both used for receiving HARQ information or both used for transmitting HARQ information, optionally, the resource in the first symbol is a common resource, HARQ information corresponding to data transmitted in the PSSCH slot associated with the first symbol may be transmitted in the first symbol, and the resource in the second symbol is a resource used for multicast transmission. Or the resources in the first symbol and the second symbol are common resources, and the HARQ information corresponding to the data transmitted in the PSSCH time slot associated with the time slot where the first symbol and the second symbol are located can be transmitted in the common resources.

Optionally, the frequency domain resource and the code domain resource of the first symbol are used first, and the frequency domain resource and the code domain resource of the second symbol are used later; alternatively, the frequency domain resource of the first symbol and the frequency domain resource of the second symbol are used first, and the code domain resource of the first symbol and the code domain resource of the second symbol are used later. The frequency domain resources of the first symbol and the frequency domain resources of the second symbol are used first, which is understood to mean that the frequency domain resources of the first symbol are used first and the frequency domain resources of the second symbol are used later.

The frequency domain resource of the first symbol and the frequency domain resource of the second symbol are used first, and the code domain resource of the first symbol and the code domain resource of the second symbol are used later, which can be understood that the use sequence of the resources of the first symbol and the second symbol is as follows: the frequency domain resource of the first symbol, the frequency domain resource of the second symbol, the code domain resource of the first symbol, the code domain resource of the second symbol. Specific how to determine the frequency domain resources and/or code domain resources that can be used can be found in the description of S1810 and S1820 in the present application. But is not limited to the implementation methods given in S1810 and S1820.

As shown in fig. 17, a schematic structure of a PSFCH slot including two PSFCH symbols is shown. The first terminal equipment initializes COT, the COT comprises 5 time slots, the first terminal equipment transmits a transport block in a time slot n, and receives HARQ information corresponding to the transport block in a time slot n+2. The first transport block is multicast data and the first terminal device indicates that slot n+2 includes two PSFCH symbols. The sequence of using PSFCH frequency domain resources is as follows: the frequency domain resources comprised by the first PSFCH symbol may be used first, and then the frequency domain resources comprised by the second PSFCH symbol may be used; alternatively, the frequency domain resources and the code domain resources included in the first PSFCH symbol are used first, and then the frequency domain resources and the code domain resources included in the second PSFCH symbol are used. Optionally, the resources of the first PSFCH symbol are common resources, and the data transmitted in the PSSCH slot associated with the PSFCH symbol may all transmit corresponding HARQ information in the PSFCH symbol, and the resources of the second PSFCH symbol may be used for the HARQ information of the multicast data. For example, if the first terminal device sends a transport block in slot n, where the transport block is scheduled by the SCI, and a propagation type (cast type) field in the SCI indicates that the propagation type of the transport block is multicast, then the receiving terminal device may use more than one of the partial resources in the first PSFCH symbol and all of the resources in the PSFCH symbol. The receiving terminal device comprises the second terminal device in the embodiment of the application. The determination of the partial resources in the first PSFCH symbol is described in S1810 and S1820.

Optionally, under feedback of multicast ACK or NACK, if the PSFCH resource is insufficient, the first terminal device may disable the HARQ mechanism and use a blind retransmission mode.

Illustratively, a third PSFCH time domain resource of the at least one PSFCH time domain resource occupies a first symbol for transmitting HARQ information and a second symbol for receiving HARQ information, or the first symbol for receiving HARQ information and the second symbol for transmitting HARQ information, wherein the third PSFCH time domain resource comprises the first PSFCH time domain resource and/or the second PSFCH time domain resource. That is, the first PSFCH time domain resource may occupy or include two PSFCH symbols, and/or the second PSFCH time domain resource may occupy or include two PSFCH symbols. Where the first symbol is earlier in the time domain than the second symbol, both the first symbol and the second symbol are PSFCH symbols. The PSSCH slot associated with the first symbol and the PSSCH slot associated with the second symbol may be different.

Optionally, the time slot in which the first PSFCH time domain resource is located may be the same as or different from the time slot in which the second PSFCH time domain resource is located. That is, one slot may include a first PSFCH time domain resource, or include a second PSFCH time domain resource, or include both the first PSFCH time domain resource and the second PSFCH time domain resource.

Optionally, the PSFCH slot includes a PSFCH symbol for transmitting HARQ information and a PSFCH symbol for receiving HARQ information, and the first terminal device determines a sequence of the two PSFCH symbols according to whether the PSFCH slot is shared with other terminal devices.

When one slot includes a time domain resource for transmitting HARQ information and a time domain resource for receiving HARQ information, a time domain sequence of symbols occupied by a PSFCH time domain resource for transmitting HARQ information and symbols occupied by a PSFCH time domain resource for receiving HARQ information depends on whether the PSSCH resource included in the slot is used for transmitting or receiving a transport block. When the PSSCH resource included in the time slot is used for transmitting a transport block, a symbol occupied by the PSFCH time domain resource for transmitting the HARQ information is before a symbol occupied by the PSFCH time domain resource for receiving the HARQ information; when the PSSCH resource included in the slot is used for receiving the transport block, a symbol occupied by the PSFCH time domain resource for receiving the HARQ information precedes a symbol occupied by the PSFCH time domain resource for transmitting the HARQ information. Thereby ensuring that the number of the transmitting-receiving switching points is as small as possible.

Illustratively, the time slot in which the third PSFCH time domain resource is located includes a symbol for transmitting a third transport block, a first symbol occupied by the third PSFCH time domain resource is used for transmitting HARQ information, and a second symbol occupied by the third PSFCH time domain resource is used for receiving HARQ information, where in the time domain, the first symbol precedes the second symbol. Or, the time slot where the third PSFCH time domain resource is located includes a symbol for receiving the fourth transport block, the first symbol occupied by the third PSFCH time domain resource is used for receiving HARQ information, and the second symbol occupied by the third PSFCH time domain resource is used for transmitting HARQ information, where in the time domain, the first symbol precedes the second symbol. Thereby ensuring that the number of the transmitting-receiving switching points is as small as possible.

Alternatively, the first terminal device may indicate in the first indication information whether the first symbol occupied by the third PSFCH time domain resource is used for transmitting HARQ information or receiving HARQ information, and whether the second symbol occupied by the third PSFCH time domain resource is used for transmitting HARQ information or receiving HARQ information. Alternatively, the first terminal device may indicate in the first indication information whether the first symbol and the second symbol of the third PSFCH time domain resource occupation are used for transmitting HARQ information or for receiving HARQ information. This can avoid the problem of PSFCH transmission and reception collision caused when one slot has only one PSFCH symbol.

Optionally, the at least one interleaved frequency domain resource occupied by the first HARQ information is determined from the at least one interleaved frequency domain resource occupied by the first transport block. In other words, at least one interlace occupied by the first HARQ information is associated with at least one interlace occupied by the first transport block. The at least one interleaved frequency domain resource occupied by the second HARQ information is determined from the at least one interleaved frequency domain resource occupied by the second transport block. Alternatively, at least one interlace occupied by the second HARQ information is associated with at least one interlace occupied by the second transport block.

Illustratively, the at least one interleaved frequency domain resource occupied by the first transport block includes at least one interleaved frequency domain resource occupied by the first HARQ information, and the at least one interleaved frequency domain resource occupied by the second transport block includes at least one interleaved frequency domain resource occupied by the second HARQ information. It can be understood that the frequency domain resources of the interlace occupied by the first transport block are the same as those of the interlace occupied by the first HARQ information, or the frequency domain resources of the interlace occupied by the first HARQ information are the same as those of a part of the interlaces occupied by the first transport block. The frequency domain resources of the interlace occupied by the second transport block are the same as the frequency domain resources of the interlace occupied by the second HARQ information, or the frequency domain resources of the interlace occupied by the second HARQ information are the same as the frequency domain resources of a partial interlace among the plurality of interlaces occupied by the second transport block. Optionally, at least one interlace occupied by the first HARQ information belongs to the first set of interlaces. The first set of interlaces is a resource corresponding to at least one interlace occupied by the first transport block and available for transmitting HARQ information. The frequency domain range of the first set of interlaces and the frequency domain range of the at least one interlace occupied by the first transport block are the same. Optionally, at least one interlace occupied by the second HARQ information belongs to the second set of interlaces. The second set of interlaces is a resource corresponding to at least one interlace occupied by the second transport block and available for transmitting HARQ information. The frequency domain range of the second set of interlaces and the frequency domain range of the at least one interlace occupied by the second transport block are the same.

Optionally, before the first terminal device receives the first HARQ information corresponding to the first transport block from the second terminal device, the first terminal device further sends a fifth transport block to the second terminal device in the COT; the first terminal equipment receives first HARQ information corresponding to a first transmission block and fifth HARQ information corresponding to a fifth transmission block from the second terminal equipment in a first PSFCH time domain resource in at least one PSFCH time domain resource, wherein the code domain resource used by the first HARQ information is different from the code domain resource used by the fifth HARQ information. Specific implementation methods can be seen in S1810 and S1820. This is to prevent the first HARQ information and the fifth HARQ information from using the same frequency domain resource and code domain resource, so that the first HARQ information and the fifth HARQ information cannot be successfully transmitted, thereby reducing reliability of corresponding data transmission. The implementation methods in S1010 and S1020, S1030 may be combined with S1810 and S1820.

In the technical solution provided in the embodiment of the present application, for a first terminal device to send first indication information for indicating at least one PSFCH time domain resource in a COT to a second terminal device, the method includes: on the premise of periodically configuring PSFCH resources at a system level, dynamically indicating whether candidate PSFCH time domain resources in COT are real PSFCH time domain resources or not, avoiding COT interruption caused by transmission of HARQ information in some candidate PSFCH time domain resources, fully considering HARQ information fed back across COT, HARQ disabling, PSSCH time slot to PSFCH time slot feedback timing and other factors to indicate the PSFCH time domain resources, thereby ensuring data transmission reliability and improving PSFCH resource configuration flexibility. In addition, the first terminal device may instruct the PSFCH time domain resource to be used for transmitting HARQ or receiving HARQ, and consider that the PSFCH time slot is used for transmitting HARQ or receiving HARQ when determining the PSSCH time slot associated with the PSFCH time slot, so as to effectively avoid potential transmission and reception conflicts of the PSFCH; the first terminal device may indicate that the PSFCH slot comprises a plurality of PSFCH symbols, solving the problem of insufficient PSFCH resources on the unlicensed spectrum, especially for multicast transmissions. Therefore, the normal work of the HARQ mechanism is ensured, and the reliability of data transmission is further ensured.

The slots of the multiple transmission TBs correspond to one slot including PSFCH resources, which may not be sufficient when PSFCH is transmitted using an interleaved manner.

Therefore, another communication method is provided in the embodiment of the present application, each transmission TB is interleaved with the corresponding transmission HARQ information, so that the transmission of the HARQ information is further ensured, and the reliability of data transmission can be improved. As shown in fig. 18, a schematic flow chart interaction diagram of another method 1800 of communication proposed by an embodiment of the present application is shown. This embodiment may be combined with the previous embodiment, that is, after determining one or more PSFCH time domain resources included in the COT and the use of the PSFCH time domain resources in the previous embodiment, determining a PSSCH slot associated with the PSFCH time domain resources, and further determining a mapping rule from the PSSCH slot to the PSFCH slot, that is, a technical solution of this embodiment. The technical solution of this embodiment is not limited to the combination with the previous embodiment.

1810, the first terminal device sends a first transport block to the second terminal device within a channel occupation time COT, the first transport block occupying at least one interlace, one interlace comprising at least one resource block. Correspondingly, the second terminal device receives the first transport block from the first terminal device within the COT.

The interleaving of this step, the description of the COT is not repeated, and is the same as the interleaving, COT description in process 1010 of FIG. 10.

1820, the second terminal device sends, to the first terminal device, first HARQ information corresponding to the first transport block within the COT. Correspondingly, the first terminal equipment receives first HARQ information corresponding to the first transmission block from the second terminal equipment in the COT, and at least one staggered frequency domain resource occupied by the first HARQ information is determined according to at least one staggered frequency domain resource occupied by the first transmission block. Specifically, the at least one interlace occupied by the first HARQ information is determined from a set of available interlaces, the frequency domain resources of the set of available interlaces being the same as the frequency domain resources of the at least one interlace occupied by the first transport block. The at least one interlace occupied by the first HARQ information may be randomly selected from the set of available interlaces or may be modulo the set of available interlaces according to the source ID in the SCI used to schedule the first transport block.

Illustratively, the at least one interleaved frequency domain resource occupied by the first transport block comprises at least one interleaved frequency domain resource occupied by the first HARQ information. It can be understood that the at least one interlace occupied by the first HARQ information is from the set of available interlaces comprised by the PSFCH time domain resources, and that the frequency domain resources of the set of available interlaces correspond to or are the same as the frequency domain resources of the at least one interlace occupied by the first transport block. It can be understood that the frequency domain resources of the interlace occupied by the first transport block are the same as those of the available interlace set or the frequency domain resources of the interlace occupied by the first HARQ information are the same as those of the partial interlace among the plurality of interlaces occupied by the first transport block. The interlace occupied by the first HARQ information may be randomly selected from the set of available interlaces. Or modulo the set of available interlaces based on the source ID in the SCI used to schedule the first transport block.

The frequency domain resource corresponding to the ith interlace of the first slot is the same as the frequency domain resource corresponding to the jth interlace of the second slot, the first slot is the slot in which the first transport block is transmitted, the second slot is the slot in which the first HARQ is received (that is, the second slot includes the PSFCH time domain resource), and the ith interlace of the first slot is associated with the jth interlace of the second slot, where i and j are positive integers. Alternatively, i may be equal to j. Or the frequency domain resource corresponding to the ith interlace of the first time slot is different from the frequency domain resource corresponding to the jth interlace of the second time slot, and the ith interlace of the first time slot is associated with the jth interlace of the second time slot, optionally, i may be equal to j. Alternatively, i may not be equal to j. That is, there is a mapping relationship between the frequency domain resources corresponding to the interlaces of the first slot and the frequency domain resources corresponding to the interlaces of the second slot. The mapping relation may be configured or preconfigured or predefined in the resource pool, or may be indicated by the first terminal device in the sent control information. The control information may be carried on the first level SCI, on the second level SCI, on the MAC CE, or on the SCI.

Optionally, the first terminal device sends a second transport block to the second terminal device within the COT, the second transport block occupying at least one interlace; the second terminal equipment receives a second transmission block from the first terminal equipment in the COT, and the second terminal equipment sends second HARQ information corresponding to the second transmission block to the first terminal equipment in the COT; the first terminal equipment receives second HARQ information corresponding to a second transmission block from the second terminal equipment in the COT, and at least one staggered frequency domain resource occupied by the second HARQ information is determined according to the at least one staggered frequency domain resource occupied by the second transmission block. Specifically, the at least one interlace occupied by the second HARQ information is determined from the set of available interlaces, the frequency domain resources of the set of available interlaces being the same as the frequency domain resources of the at least one interlace occupied by the second transport block. The at least one interlace occupied by the second HARQ information may be randomly selected from the set of available interlaces, or may be modulo the set of available interlaces according to the source ID in the SCI used to schedule the second transport block, or may be the interlace in the set of available interlaces with the highest index or highest end position in the frequency domain, or the interlace in the set of available interlaces with the lowest index or lowest start position in the frequency domain.

Illustratively, the at least one interleaved frequency domain resource occupied by the second transport block comprises at least one interleaved frequency domain resource occupied by the second HARQ information. It can be understood that the at least one interlace occupied by the second HARQ information is from the set of available interlaces included in the PSFCH time domain resources, and that the frequency domain resources of the set of available interlaces correspond to or are the same as the frequency domain resources of the at least one interlace occupied by the second transport block. It can be understood that the frequency domain resources of the available interlace set are the same as those of the interlace occupied by the second HARQ information or the frequency domain resources of the available interlace set are partially staggered frequency domain resources of the plurality of interlaces occupied by the second transport block. The interlace occupied by the second HARQ information may be randomly selected from the set of available interlaces. Either modulo the set of available interlaces according to the source ID in the SCI used to schedule the second transport block, or the interlace in the set of available interlaces with the highest index or highest frequency domain end position, or the interlace in the set of available interlaces with the lowest index or lowest frequency domain start position.

The frequency domain resource corresponding to the ith interlace of the third slot is the same as the frequency domain resource corresponding to the jth interlace of the second slot, the third slot is the slot for transmitting the second transport block, the second slot is the slot for receiving the first HARQ information and the second HARQ information, and the ith interlace of the third slot is associated with the jth interlace of the second slot, wherein i and j are positive integers. Alternatively, i is equal to j. Or the frequency domain resource corresponding to the ith interlace of the third time slot is different from the frequency domain resource corresponding to the jth interlace of the second time slot, the ith interlace of the third time slot is associated with the jth interlace of the second time slot, wherein j is a positive integer, and optionally, i is not equal to j.

That is, there is a mapping relationship between the frequency domain resources corresponding to the interlaces of the third slot and the frequency domain resources corresponding to the interlaces of the second slot. The mapping relation may be configured or preconfigured or predefined in the resource pool, or may be indicated by the first terminal device in the sent control information. The control information may be carried on the first level SCI, on the second level SCI, on the MAC CE, or on the SCI.

Optionally, the code domain resource of the PSFCH resource corresponding to the ith interlace in the first slot is different from the code domain resource of the PSFCH resource corresponding to the jth interlace in the third slot. It can be understood that the code domain resources used when the first HARQ information is transmitted are different from the code domain resources used when the second HARQ information is transmitted. Optionally, the code domain resource sets of the PSFCH resources corresponding to the ith interlace in the first slot are the same, and the code domain resource sets of the PSFCH resources corresponding to the jth interlace in the third slot are the same. Optionally, the code domain resource of the PSFCH resource corresponding to the ith interlace in the first slot is different from the code domain resource of the PSFCH resource corresponding to the jth interlace in the third slot. The code domain resource of the PSFCH resource corresponding to the ith interlace in the first slot comes from the first code domain resource set, the code domain resource of the PSFCH resource corresponding to the jth interlace in the third slot comes from the second code domain resource set, and the first code domain resource set and the second code domain resource set are two orthogonal/different code domain resource sets. The first set of code domain resources and the second set of code domain resources may be configured, preconfigured or predefined.

Optionally, the first time slot and the third time slot are associated with a second time slot, where the second time slot is a time slot including the PSFCH resource at the first M time slots after the first terminal device transmits the first transport block in the first time slot, and the second time slot is a time slot including the PSFCH resource at the first M time slots after the first terminal device transmits the second transport block in the third time slot.

As shown in fig. 19, a schematic diagram of interleaving of different time slots is shown. One of the PSFCH resources for an interlace used for transmitting a TB is the same interlace in the time slot that includes the PSFCH time domain resource as the frequency domain resource of the interlace. HARQ information corresponding to TBs in slot n and slot n+1 is fed back in slot n+3. I.e. the time slots associated with time slot n+3 are time slot n and time slot n+1. I.e. interlace i in slot n corresponds to interlace i in slot n +3, i may be equal to 0, 1, 2, 3 or 4. Since the frequency domains of the different interlaces in the time slot n are different, the frequency domains of the different interlaces in the PSFCH resource corresponding to the time slot n are also different.

When the time slots of the plurality of transmission TBs correspond to one time slot for transmitting the HARQ information, the HARQ information corresponding to the time slots of the plurality of transmission TBs is code division multiplexed. HARQ information corresponding to TBs transmitted in time slot n and time slot n+1 is fed back in time slot n+3. The available PSFCH frequency domain resources corresponding to the same interlace/same frequency domain position in slot n and slot n+1 are the same, and the corresponding cyclic shift pairs (cyclic shift pair, CS pair) are different. For example, the code domain resources corresponding to the interlaces in slot n are from a first set of code domain resources and the code domain resources corresponding to the interlaces in slot n+1 are from a second set of code domain resources.

The specific code domain resources (first set of code domain resources or second set of code domain resources) may be configured, pre-configured or pre-defined, or may be determined according to the number of time slots of the transmission TB and/or the number of code domain resources. CS pair includes at least one of { (0, 6); (1, 7); (2, 8); (3, 9); (4, 10); (5, 11), i.e., a maximum of 12 cyclic shift offset values for the code domain resource. As shown in table 4, taking 4 CS pairs and 2 slots for transmitting TBs as examples, a code domain resource allocation method is given. Orthogonality exists between different code domain resources, and both frequency division multiplexing and code division multiplexing can ensure the orthogonality. For example, HARQ of TB1 transmitted on interlace 1 in slot n feeds back on PSFCH interlace 1 of slot n+3 using one of the code domain resources (0, 6), (3, 9); HARQ for TB2 transmitted on interlace 1 in slot n+1 feeds back on PSFCH interlace 1 of slot n+3 using one of the code domain resources (1, 7), (4, 10).

TABLE 4 Table 4

Time slot associated with time slot n+3 for transmitting a TB	CS logarithm 4
		Time slot n	(0, 6); (3, 9) (first code domain resource set)
Time slot n+1	(1, 7); (4, 10) (second set of code domain resources)

Optionally, at least one fourth time slot is associated with the second time slot, where the second time slot is a time slot used by the first terminal device to receive HARQ information, the at least one fourth time slot is a time slot used by the first terminal device to send a TB, the second time slot is a time slot used by a first of M time slots spaced after the fourth time slot to receive HARQ information, and the at least one fourth time slot includes the first time slot and the third time slot. The set of code domain resources corresponding to each of the at least one fourth time slot is different. Or, at least one fifth time slot is associated with a sixth time slot, the sixth time slot is a time slot used for transmitting HARQ information by the first terminal device, at least one fifth time slot is a time slot used for receiving a TB by the first terminal device, at least one fifth time slot is a time slot shared in the COT of the first terminal device, and the sixth time slot is a time slot used for transmitting HARQ information by the first of M time slots after the fifth time slot. The set of code domain resources corresponding to each of the at least one fifth time slot is different.

As shown in fig. 20, a schematic diagram of interleaving of PSFCH slots comprising 2 PSFCH symbols is shown. HARQ information corresponding to TBs in slot n and slot n+1 is fed back in slot n+3, where slot n+3 includes 2 PSFCH symbols. I.e. the time slots associated with time slot n+3 are time slot n and time slot n+1. For example, TB1 transmitted in slot n occupies interlace 0 and interlace 1, and the available resources of HARQ information for that TB1 include interlace 0 and interlace 1 in the first PSFCH symbol and all interlaces in the second PSFCH symbol in slot n+3. The interleaving order of the HARQ information corresponding to the TB1 is: interlace 0, interlace 1, interlace 2, interlace 3, and interlace 4 of the first symbol. It should be understood that when the number of symbols occupied by the PSFCH time domain resource in one PSFCH slot is greater than 1, the scheme for transmitting HARQ information by using different PSFCH symbols may be described in the embodiment of fig. 10, which is not repeated here.

Illustratively, the PSSCH slot contains N interlaces and the PSFCH slot contains L interlaces. The PSFCH slots are associated with M PSSCH slots. Interlace i (1.ltoreq.i.ltoreq.N) in slot j (1.ltoreq.j.ltoreq.M) in the PSSCH slot may be allocated one of the L interlaces of the PSFCH slot, and in particular may be interlace i of the L interlaces. The corresponding code domain resource is Alternatively, m=l.

The terminal equipment receives data (transmission block) in an interlace i (1.ltoreq.i.ltoreq.N) in a time slot j (1.ltoreq.j.ltoreq.M) in the PSSCH time slot, and the terminal equipment determines the time slot for transmitting the HARQ information of the data and the frequency domain code domain resource used in the time slot. Namely: interlace i of the L interlaces of PSFCH slot, the code domain resource is(1. Ltoreq.j. Ltoreq.M) may be preconfigured or configured, or predefined.

Specifically, the code domain resource used may be selected randomly or may be the source P contained in the SCI received by the terminal device _ID Modulo the code domain resource determined (P _ID mod)。

The terminal equipment determines PSFCH frequency domain resources and code domain resources for transmitting the HARQ information and sends the HARQ information. When the number of interlaces occupied by the terminal equipment is greater than 1, the number of interlaces in the corresponding PSFCH symbols is also greater than 1, and the frequency domain code domain resource used by the terminal equipment can be randomly selected or can be the source P contained in SCI received by the terminal equipment _ID Modulo the code domain resource determined (P _ID mod)。

Optionally, before transmitting the HARQ information, LBT of type2A/2B/2C is performed, and when LBT succeeds, the HARQ information is transmitted, and when LBT fails, no transmission is performed.

Optionally, the PSSCH slot includesThe PSFCH slots contain +. >The interleaving is performed. PSFCH slot association->And PSSCH slots. At this time->Multiple interlaces for transmitting data may be allocatedAnd interleaving for transmitting HARQ information. The interlaces in each PSSCH slot can correspond toInterleaving in PSFCH slots, slots in PSSCH slotsIs->The interlaces in the PSFCH slots may be allocated: />UE expects->Is->Is a multiple of (2).

Optionally, the frequency domain code domain resource corresponding to the transmission of one PSSCH is:

wherein->The individual resources may be used. I.e. determining availability based on the start interlace of the PSSCH occupied interlaces (the lowest indexed interlace of the PSSCH occupied interlaces, or the interlace with the smallest distance from the frequency domain start position)Resources for transmitting HARQ information, +.> The individual resources may be used. I.e. interleaving according to PSSCH occupancy>To determine the resources that can be used to transmit HARQ information. PSFCH resources are first +.>The resources are ordered in an ascending order of the interleaved index, and then the indexes are ordered in an ascending order of the cyclic shift.

Optionally, the PSSCH slot includesThe PSFCH slots contain +.>The interleaving is performed. PSFCH slot association->And PSSCH slots. The PSFCH resource corresponding to each PSSCH transmission of the terminal equipment is as followsWherein- >Is the number of cyclic shift pairs.Or->Terminal equipment for transmitting HARQ information in the applicationThis manner may be used to determine the set of available PSFCH resources.

Optionally, the first terminal device sends a first transport block to the second terminal device within the COT, where the first transport block may be multicast data. I.e. the transmission type indication field included in the SCI scheduling the first transport block, such as the second level SCI, is indicated as "multicast". The first terminal equipment receives first HARQ information corresponding to the first transport block from the second terminal equipment in the COT, where the first HARQ information may occupy two interlaces in a PSFCH time domain resource in a second time slot, and the second time slot is a time slot in which the first HARQ information is received. Wherein a first one and a second one of the two interlaces are orthogonal, i.e. two interlaces that are different in the frequency domain. The first interlace may be used for the terminal device (the terminal device that received the first transport block, including the second terminal device) to send ACK information and the second interlace may be used for the terminal device (the terminal device that received the first transport block, including the second terminal device) to send NACK information. That is, the two interlaces are common resources, one for all terminal devices receiving the first transport block to send NACKs and one for all terminal devices receiving the first transport block to send ACKs. I.e. the terminal device that successfully received the first transport block may send an ACK in the first interlace; the terminal device that did not successfully receive the first transport block may send a NACK at the second interlace. The terminal device receiving the first transport block may be plural, including the second terminal device. Wherein the first interlace and the second interlace may be preconfigured, predefined, or configured, or dynamically indicated by the first terminal device, or determined from resources occupied by the first transport block. There is no limitation in this regard. Optionally, the first terminal device may receive, in other COTs, first HARQ information corresponding to the first transport block from the second terminal device.

Optionally, the first terminal device sends a first transport block to the second terminal device within the COT, where the first transport block may be multicast data. I.e. the transmission type indication field included in the SCI scheduling the first transport block, such as the second level SCI, is indicated as "multicast". The first terminal device receives, in the COT, first HARQ information corresponding to the first transport block from the second terminal device, where the first HARQ information may occupy 1 interlace in the PSFCH time domain resource in the second slot, and multiple terminal devices receiving the first transport block (multiple receiving terminal devices of the first transport block) may commonly use resource blocks included in the 1 interlace.

Alternatively, the number of symbols of the PSFCH time domain resource may be related to the number of bits of the HARQ information to be transmitted, or the number of symbols of the PSFCH time domain resource may be indicated by the first terminal device, or the number of symbols of the PSFCH time domain resource may be associated with the PSFCH format.

Optionally, the first HARQ information occupies one interlace, and the interlace includes X resource blocks. And when the first HARQ information is carried by the PSFCH format 0, the second terminal equipment repeatedly transmits the PSFCH format 0 in X resource blocks when transmitting the first HARQ information, namely, the PSFCH format 0 is respectively transmitted on the X resource blocks. The cyclic shift initial value or cyclic shift value of PSFCH format 0 over the X resource blocks may be different. And the cyclic shift initial value or the difference of the cyclic shift values of two consecutive resource blocks among the X resource blocks may be fixed. For example, x=10, the cyclic shift values of PSFCH format 0 of 10 resource blocks may be {0,6}, {1,7}, {2,8}, {3,9}, {4,10}, {5,11} {0,6}, {1,7}, {2,8}, {3,9}, respectively, where the difference is 1.

In the technical scheme provided by the embodiment of the application, the frequency domain resource of at least one interlace occupied by the first HARQ information corresponding to the first transmission block is determined according to the frequency domain resource of at least one interlace occupied by the first transmission block, and each interlace used for transmitting the TB has the corresponding interlace used for transmitting the HARQ information, so that the transmission of the HARQ information can be further ensured, and the reliability of data transmission can be improved. In addition, when the time slots of the plurality of transmission TBs correspond to one time slot for transmitting HARQ information, the HARQ information corresponding to the time slots of the plurality of transmission TBs is code division multiplexed, so that insufficient PSFCH resources can be avoided, and further, the reliability of data transmission can be improved.

The method of communication provided by the embodiment of the present application is described above, and an execution body for executing the method of communication described above will be described below.

The embodiment of the application provides a communication device, and as shown in fig. 21, a schematic block diagram of a communication device 2100 according to the embodiment of the application is shown. The device can be applied to or deployed in the first terminal equipment in the embodiment of the method.

The communication apparatus 2100 includes: a sending unit 2110, configured to send first indication information to a second terminal device, where the first indication information is used to indicate at least one physical sidelink feedback channel PSFCH time domain resource within a channel occupation time COT; the sending unit is further configured to send a first transport block to the second terminal device in the COT;

A receiving unit 2120, configured to receive, in a first PSFCH time domain resource of the at least one PSFCH time domain resource, first hybrid automatic repeat request HARQ information corresponding to the first transport block from the second terminal device, where the first HARQ information occupies at least one interlace, and the interlace includes at least one resource block.

Optionally, the receiving unit 2120 is further configured to receive, within the COT, a second transport block from the second terminal device; the first terminal equipment sends second HARQ information corresponding to the second transmission block to the second terminal equipment in a second PSFCH time domain resource in the at least one PSFCH time domain resource, wherein the second HARQ information occupies at least one interlace; the sending unit 2110 is further configured to send, in a second PSFCH time domain resource of the at least one PSFCH time domain resource, second HARQ information corresponding to the second transport block to the second terminal device, where the second HARQ information occupies at least one interlace.

Optionally, the first indication information is used to indicate that the first PSFCH time domain resource is used to receive the first HARQ information, and the second PSFCH time domain resource is used to send the second HARQ information.

Optionally, the at least one PSFCH time domain resource belongs to a candidate PSFCH time domain resource within the COT.

Optionally, the number of symbols occupied by one PSFCH time domain resource in the at least one PSFCH time domain resource is equal to or greater than 1.

Optionally, the first lateral control information SCI schedules the first transport block, the first SCI indicates that the first transport block is multicast, and the number of symbols occupied by the first PSFCH time domain resource is greater than 1.

Optionally, a third PSFCH time domain resource of the at least one PSFCH time domain resource occupies a first symbol and a second symbol, where the first symbol and the second symbol are used for transmitting HARQ information, or the first symbol and the second symbol are used for receiving HARQ information, where the third PSFCH time domain resource includes the first PSFCH time domain resource or the second PSFCH time domain resource.

Optionally, the frequency domain resource and the code domain resource of the first symbol are used first, and the frequency domain resource and the code domain resource of the second symbol are used later, or the frequency domain resource of the first symbol and the frequency domain resource of the second symbol are used first, and the code domain resource of the first symbol and the code domain resource of the second symbol are used later.

Optionally, a third PSFCH time domain resource of the at least one PSFCH time domain resource occupies a first symbol and a second symbol, the first symbol is used for transmitting HARQ information, the second symbol is used for receiving HARQ information, or the first symbol is used for receiving HARQ information, the second symbol is used for transmitting HARQ information, where the third PSFCH time domain resource includes the first PSFCH time domain resource and/or the second PSFCH time domain resource.

Optionally, the time slot in which the third PSFCH time domain resource is located includes a symbol for transmitting a third transport block, the first symbol occupied by the third PSFCH time domain resource is used for transmitting HARQ information, and the second symbol occupied by the third PSFCH time domain resource is used for receiving HARQ information, where the first symbol is before the second symbol; or the time slot where the third PSFCH time domain resource is located includes a symbol for receiving a fourth transport block, the first symbol occupied by the third PSFCH time domain resource is used for receiving HARQ information, and the second symbol occupied by the third PSFCH time domain resource is used for sending HARQ information.

Optionally, the at least one interleaved frequency domain resource occupied by the first transport block includes at least one interleaved frequency domain resource occupied by the first HARQ information, and the at least one interleaved frequency domain resource occupied by the second transport block includes at least one interleaved frequency domain resource occupied by the second HARQ information.

The embodiment of the application proposes a communication device, as shown in fig. 22, a schematic block diagram of a communication device 2200 of the embodiment of the application is shown. The device can be applied to or deployed in the first terminal equipment in the embodiment of the method.

The communication apparatus 2200 includes: a transmitting unit 2210, configured to transmit, to a second terminal device, a first transport block within a channel occupation time COT, where the first transport block occupies at least one interlace, and the interlace includes at least one resource block; a receiving unit 2220, configured to receive, within the COT, first HARQ information corresponding to the first transport block from the second terminal device, where at least one interleaved frequency domain resource occupied by the first HARQ information is determined according to at least one interleaved frequency domain resource occupied by the first transport block.

Optionally, the at least one interleaved frequency domain resource occupied by the first transport block includes at least one interleaved frequency domain resource occupied by the first HARQ information.

Optionally, the frequency domain resource corresponding to the ith interlace of the first slot is the same as the frequency domain resource corresponding to the jth interlace of the second slot, the first slot is a slot for transmitting the first transport block, the second slot is a slot for receiving the first HARQ information, and the ith interlace of the first slot is associated with the jth interlace of the second slot, where i and j are positive integers.

Optionally, the sending unit 2210 is further configured to send, in the COT, a second transport block to the second terminal device, where the second transport block occupies at least one interlace; the receiving unit 2220 is further configured to receive, in the COT, second HARQ information corresponding to the second transport block from the second terminal device, where at least one interleaved frequency domain resource occupied by the second HARQ information is determined according to at least one interleaved frequency domain resource occupied by the second transport block.

Optionally, the at least one interleaved frequency domain resource occupied by the second transport block includes at least one interleaved frequency domain resource occupied by the second HARQ information.

Optionally, the frequency domain resource corresponding to the ith interlace of the third slot is the same as the frequency domain resource corresponding to the jth interlace of the second slot, the third slot is a slot transmitting the second transport block, the first slot is a slot receiving the second HARQ information, and the ith interlace of the third slot is associated with the jth interlace of the second slot.

Optionally, the code domain resource of the PSFCH resource corresponding to the ith interlace in the first slot is different from the code domain resource of the PSFCH resource corresponding to the ith interlace in the third slot.

Optionally, the first time slot and the third time slot are associated with the second time slot, where the second time slot is a first time slot including a PSFCH resource after the first terminal device sends M time slots after the first transport block in the first time slot, and the second time slot is a first time slot including a PSFCH resource after the first terminal device sends M time slots after the second transport block in the third time slot.

The embodiment of the application provides a communication device 2300, and as shown in fig. 23, a schematic block diagram of the communication device 2300 of the embodiment of the application is illustrated.

The communication device 2300 includes: a processor 2310 and a transceiver 2320, the transceiver 2320 is configured to receive computer codes or instructions and transmit the computer codes or instructions to the processor 2310, and the processor 2310 executes the computer codes or instructions to implement the methods in the embodiments of the present application. The communication device may be a terminal device or a core network element in an embodiment of the present application.

The processor 2310 may be an integrated circuit chip with signal processing capabilities. In implementation, the steps of the above method embodiments may be implemented by integrated logic circuits of hardware in a processor or instructions in software form. The processor may be a general purpose processor, a digital signal processor (digital signal processor, DSP), an application specific integrated circuit (application specific integrated circuit, ASIC), an off-the-shelf programmable gate array (field programmable gate array, FPGA) or other programmable logic device, discrete gate or transistor logic device, discrete hardware components. The disclosed methods, steps, and logic blocks in the embodiments of the present application may be implemented or performed. A general purpose processor may be a microprocessor or the processor may be any conventional processor or the like. The steps of the method disclosed in connection with the embodiments of the present application may be embodied directly in the execution of a hardware decoding processor, or in the execution of a combination of hardware and software modules in a decoding processor. The software modules may be located in a random access memory, flash memory, read only memory, programmable read only memory, or electrically erasable programmable memory, registers, etc. as well known in the art. The storage medium is located in a memory, and the processor reads the information in the memory and, in combination with its hardware, performs the steps of the above method.

The embodiment of the application also provides a communication system which comprises the first terminal equipment and the second terminal equipment in the communication method provided by the embodiment of the application.

The embodiment of the application also provides a computer readable storage medium, on which a computer program for implementing the method in the above method embodiment is stored. The computer program, when run on a computer, enables the computer to implement the method of the method embodiments described above.

Embodiments of the present application also provide a computer program product comprising computer program code for causing the method of the above-described method embodiments to be performed when said computer program code is run on a computer.

The embodiment of the application also provides a chip, which comprises a processor, wherein the processor is connected with a memory, the memory is used for storing a computer program, and the processor is used for executing the computer program stored in the memory, so that the chip executes the method in the embodiment of the method.

It should be understood that, in the embodiment of the present application, the numbers "first" and "second" … are merely for distinguishing different objects, for example, for distinguishing different devices or different moments, and do not limit the scope of the embodiment of the present application, which is not limited thereto.

In addition, the term "and/or" in the present application is merely an association relationship describing the association object, and indicates that three relationships may exist, for example, a and/or B may indicate: a exists alone, A and B exist together, and B exists alone. In addition, the character "/" herein generally indicates that the front and rear associated objects are an "or" relationship; the term "at least one" in the present application may mean "one" and "two or more", for example, A, B and C may mean: the seven cases are that A alone, B alone, C alone, A and B together, A and C together, C and B together, A and B together, and C together.

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. Those skilled in the art may implement the described functionality using different approaches for each particular application, but such implementation is not intended to be limiting.

It will be clearly understood by those skilled in the art that, for convenience and brevity of description, the specific working process of the system, apparatus and unit described above may refer to the corresponding process in the foregoing method embodiment, which is not repeated herein.

In the several embodiments provided by the present 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 units is merely a logical function division, and there may be additional divisions when actually implemented, e.g., multiple units 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 with each other may be an indirect coupling or communication connection via some interfaces, devices or units, which 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 this 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, comprising several instructions for causing a computer device (which may be a personal computer, a server, a network device, etc.) to perform all or part of the steps of the method according to 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 illustrative of the present application, and the present application is not limited thereto, and any person skilled in the art will readily recognize that variations or substitutions are within 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 communication, comprising:

the method comprises the steps that a first terminal device sends first indication information to a second terminal device, wherein the first indication information is used for indicating at least one physical sidelink feedback channel PSFCH time domain resource in channel occupation time COT;

the first terminal equipment sends a first transmission block to the second terminal equipment in the COT;

the first terminal equipment receives first hybrid automatic repeat request (HARQ) information corresponding to the first transmission block from the second terminal equipment in a first PSFCH time domain resource in the at least one PSFCH time domain resource, wherein the first HARQ information occupies at least one interlace which comprises at least one resource block.

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

the first terminal device receives a second transmission block from the second terminal device in the COT;

and the first terminal equipment sends second HARQ information corresponding to the second transmission block to the second terminal equipment in a second PSFCH time domain resource in the at least one PSFCH time domain resource, wherein the second HARQ information occupies at least one interlace.

3. The method of claim 2, wherein the step of determining the position of the substrate comprises,

the first indication information is used for indicating that the first PSFCH time domain resource is used for the first terminal equipment to receive the first HARQ information, and the second PSFCH time domain resource is used for the first terminal equipment to send the second HARQ information.

4. A method according to any of claims 1-3, characterized in that the at least one PSFCH time domain resource belongs to a candidate PSFCH time domain resource within the COT.

5. The method according to any one of claim 1 to 4, wherein,

the number of symbols occupied by one PSFCH time domain resource of the at least one PSFCH time domain resource is equal to or greater than 1.

6. The method of claim 5 wherein a first lateral control information SCI schedules the first transport block, the first SCI indicating that the first transport block is multicast, the first PSFCH time domain resources occupying a number of symbols greater than 1.

7. The method of claim 5, wherein the step of determining the position of the probe is performed,

a third PSFCH time domain resource of the at least one PSFCH time domain resource occupies a first symbol and a second symbol, the first symbol and the second symbol being used for transmitting HARQ information, or the first symbol and the second symbol being used for receiving HARQ information, wherein the third PSFCH time domain resource comprises the first PSFCH time domain resource or the second PSFCH time domain resource.

8. The method of claim 7, wherein the step of determining the position of the probe is performed,

the frequency domain resource and the code domain resource of the first symbol are used first, the frequency domain resource and the code domain resource of the second symbol are used later, or the frequency domain resource of the first symbol and the frequency domain resource of the second symbol are used first, and the code domain resource of the first symbol and the code domain resource of the second symbol are used later.

9. The method of claim 5, wherein a third one of the at least one PSFCH time domain resources occupies a first symbol and a second symbol, the first symbol is used to transmit HARQ information, the second symbol is used to receive HARQ information, or the first symbol is used to receive HARQ information, the second symbol is used to transmit HARQ information, wherein the third PSFCH time domain resource comprises the first PSFCH time domain resource and/or the second PSFCH time domain resource.

10. The method of claim 9, wherein the step of determining the position of the substrate comprises,

the time slot where the third PSFCH time domain resource is located includes a symbol for transmitting a third transport block, the first symbol occupied by the third PSFCH time domain resource is used for transmitting HARQ information, and the second symbol occupied by the third PSFCH time domain resource is used for receiving HARQ information, wherein the first symbol is before the second symbol; or,

The time slot where the third PSFCH time domain resource is located includes a symbol for receiving a fourth transport block, the first symbol occupied by the third PSFCH time domain resource is used for receiving HARQ information, and the second symbol occupied by the third PSFCH time domain resource is used for sending HARQ information.

11. The method according to any one of claims 2 to 10, wherein,

the at least one interleaved frequency domain resource occupied by the first transport block includes the at least one interleaved frequency domain resource occupied by the first HARQ information, and the at least one interleaved frequency domain resource occupied by the second transport block includes the at least one interleaved frequency domain resource occupied by the second HARQ information.

12. A method of communication, comprising:

the method comprises the steps that a first terminal device sends a first transmission block to a second terminal device in a channel occupation time COT, wherein the first transmission block occupies at least one interlace, and the interlace comprises at least one resource block;

and the first terminal equipment receives first hybrid automatic repeat request (HARQ) information corresponding to the first transmission block from the second terminal equipment in the COT, wherein at least one staggered frequency domain resource occupied by the first HARQ information is determined according to at least one staggered frequency domain resource occupied by the first transmission block.

13. The method of claim 12, wherein the step of determining the position of the probe is performed,

the at least one interleaved frequency domain resource occupied by the first transport block includes at least one interleaved frequency domain resource occupied by the first HARQ information.

14. The method according to claim 12 or 13, wherein,

the frequency domain resource corresponding to the ith interlace of the first time slot is the same as the frequency domain resource corresponding to the jth interlace of the second time slot, the first time slot is the time slot for transmitting the first transport block, the second time slot is the time slot for receiving the first HARQ information, and the ith interlace of the first time slot is associated with the jth interlace of the second time slot, wherein i and j are positive integers.

15. The method according to any one of claims 12 to 14, further comprising:

the first terminal equipment sends a second transmission block to the second terminal equipment in the COT, wherein the second transmission block occupies at least one interlace;

and the first terminal equipment receives second HARQ information corresponding to the second transmission block from the second terminal equipment in the COT, wherein at least one staggered frequency domain resource occupied by the second HARQ information is determined according to at least one staggered frequency domain resource occupied by the second transmission block.

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

the at least one interleaved frequency domain resource occupied by the second transport block includes the at least one interleaved frequency domain resource occupied by the second HARQ information.

17. The method according to claim 15 or 16, wherein,

the frequency domain resource corresponding to the ith interlace of the third slot is the same as the frequency domain resource corresponding to the jth interlace of the second slot, the third slot is the slot transmitting the second transport block, the first slot is the slot receiving the second HARQ information, and the ith interlace of the third slot is associated with the jth interlace of the second slot.

18. The method of claim 17, wherein the step of determining the position of the probe is performed,

the code domain resource of the PSFCH resource corresponding to the ith interlace in the first slot is different from the code domain resource of the PSFCH resource corresponding to the ith interlace in the third slot.

19. The method according to claim 17 or 18, wherein,

the first time slot and the third time slot are associated with the second time slot, the second time slot is a first time slot including a PSFCH resource after the first terminal device transmits M time slots after the first transport block in the first time slot, and the second time slot is a first time slot including a PSFCH resource after the first terminal device transmits M time slots after the second transport block in the third time slot.

20. A communication device, comprising:

a sending unit, configured to send first indication information to a second terminal device, where the first indication information is used to indicate at least one physical sidelink feedback channel PSFCH time domain resource within a channel occupation time COT;

the sending unit is further configured to send a first transport block to the second terminal device in the COT;

a receiving unit, configured to receive, in a first PSFCH time domain resource of the at least one PSFCH time domain resource, first hybrid automatic repeat request HARQ information corresponding to the first transport block from the second terminal device, where the first HARQ information occupies at least one interlace, and the interlace includes at least one resource block.

21. The apparatus of claim 20, wherein the device comprises a plurality of sensors,

the receiving unit is further configured to receive a second transport block from the second terminal device within the COT; the first terminal equipment sends second HARQ information corresponding to the second transmission block to the second terminal equipment in a second PSFCH time domain resource in the at least one PSFCH time domain resource, wherein the second HARQ information occupies at least one interlace;

the sending unit is further configured to send, in a second PSFCH time domain resource of the at least one PSFCH time domain resource, second HARQ information corresponding to the second transport block to the second terminal device, where the second HARQ information occupies at least one interlace.

22. The apparatus of claim 21, wherein the device comprises a plurality of sensors,

the first indication information is used for indicating that the first PSFCH time domain resource is used for receiving the first HARQ information, and the second PSFCH time domain resource is used for sending the second HARQ information.

23. The device according to any one of claims 20 to 22, wherein,

the at least one PSFCH time domain resource belongs to a candidate PSFCH time domain resource within the COT.

24. The device according to any one of claims 20 to 23, wherein,

25. The apparatus of claim 24, wherein the device comprises a plurality of sensors,

the first lateral control information SCI schedules the first transport block, the first SCI indicates that the first transport block is multicast, and the number of symbols occupied by the first PSFCH time domain resource is greater than 1.

26. The apparatus of claim 24, wherein the device comprises a plurality of sensors,

27. The apparatus of claim 26, wherein the device comprises a plurality of sensors,

28. The apparatus of claim 24, wherein a third one of the at least one PSFCH time domain resources occupies a first symbol and a second symbol, the first symbol is used for transmitting HARQ information, the second symbol is used for receiving HARQ information, or the first symbol is used for receiving HARQ information, the second symbol is used for transmitting HARQ information, wherein the third PSFCH time domain resource comprises the first PSFCH time domain resource and/or the second PSFCH time domain resource.

29. The apparatus of claim 28, wherein the device comprises a plurality of sensors,

30. The device according to any one of claims 21 to 29, wherein,

31. A communication device, comprising:

a sending unit, configured to send a first transport block to a second terminal device within a channel occupation time COT, where the first transport block occupies at least one interlace, and the interlace includes at least one resource block;

and a receiving unit, configured to receive, in the COT, first HARQ information corresponding to the first transport block from the second terminal device, where at least one interleaved frequency domain resource occupied by the first HARQ information is determined according to at least one interleaved frequency domain resource occupied by the first transport block.

32. The apparatus of claim 31, wherein the device comprises a plurality of sensors,

33. The apparatus of claim 31 or 32, wherein the device comprises a plurality of sensors,

34. The device according to any one of claims 31 to 33, wherein,

the sending unit is further configured to send, in the COT, a second transport block to the second terminal device, where the second transport block occupies at least one interlace;

the receiving unit is further configured to receive, in the COT, second HARQ information corresponding to the second transport block from the second terminal device, where at least one interleaved frequency domain resource occupied by the second HARQ information is determined according to at least one interleaved frequency domain resource occupied by the second transport block.

35. The apparatus of claim 34, wherein the device comprises a plurality of sensors,

36. The apparatus of claim 34 or 35, wherein the device comprises a plurality of sensors,

37. The apparatus of claim 36, wherein the device comprises a plurality of sensors,

38. The apparatus according to claim 36 or 37, wherein

39. 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 19.

40. A computer-readable storage medium, comprising:

the computer readable medium stores a computer program;

the computer program, when run on a computer or a processor, causes the computer or the processor to perform the method of any one of claims 1 to 19.

41. A computer program product comprising a computer program which, when executed, causes the method of any one of claims 1 to 19 to be carried out.