Sidelink Feedback Information Transmission Method and Communications Apparatus

Patent metadata

Field	Value
Publication number	US-2022174720-A1
Application number	US-202217672506-A
Country	US
Kind code	A1
Filing date	Feb 15, 2022
Priority date	Aug 16, 2019
Publication date	Jun 2, 2022
Grant date	—

Abstract

This application provides a sidelink feedback information transmission method and a communications apparatus, and may be used in a system such as an internet of vehicles, V2X, or V2V. The method includes: sending sidelink scheduling information to a first terminal device on a first channel, where the sidelink scheduling information is used to schedule the first terminal device to send sidelink data to a second terminal device on a sidelink; and determining a second channel, where the second channel is used to receive, from the first terminal device, HARQ information for the sidelink data.

First claim

1 - 33 . (canceled)

34 . A method performed by a first terminal device, wherein the method comprises:
receiving sidelink scheduling information on a physical downlink control channel, wherein the sidelink scheduling information schedules the first terminal device to send sidelink data to a second terminal device; receiving, on a physical sidelink feedback channel from the second terminal device, hybrid automatic repeat request (HARQ) information for the sidelink data; and determining, based on a time domain position of the physical sidelink feedback channel and an HARQ timing, a time domain position of a physical uplink control channel for sending the HARQ information, and sending the HARQ information on the physical uplink control channel, wherein the HARQ timing is an offset value between the time domain position of the physical uplink control channel and the time domain position of the physical sidelink feedback channel.

35 . The method according to claim 34 , wherein the HARQ timing is a quantity of slots between a slot in which a last symbol of the physical sidelink feedback channel is located and a slot in which a start symbol of the physical uplink control channel is located.

36 . The method according to claim 34 , wherein
the HARQ timing is received by the first terminal device through the physical downlink control channel.

37 . The method according to claim 34 , wherein
the sidelink scheduling information is downlink control information.

38 . The method according to claim 34 , wherein when the physical uplink control channel and a first channel overlap in time domain, the method further comprising:
determining, based on a subcarrier spacing or processing capability information of the first terminal device and the physical sidelink feedback channel, a time domain offset value that is between the time domain position of the physical sidelink feedback channel and a time domain position of a channel, the channel being the physical uplink control channel or the first channel and having an earlier time domain position in the physical uplink control channel and the first channel.

39 . The method according to claim 38 , wherein the time domain offset value T 3 is determined according to following formula:
T 3 =( N SL-to-UL +d SL-to-UL +y )×(2048+144)×κ×2 −μ 2 ×T C ,
wherein y is a positive integer, N SL-to-UL is a quantity of symbols that is determined based on the subcarrier spacing or the processing capability information of the first terminal device, d SL-to-UL is a quantity of symbols that is determined based on the physical sidelink feedback channel or the processing capability information of the first terminal device, κ is a ratio of T s to T c , T c is a first time unit, T s is a second time unit, and μ 2 is the subcarrier spacing.

40 . A method performed by a network device, wherein the method comprises:
sending sidelink scheduling information to a first terminal device on a physical downlink control channel, wherein the sidelink scheduling information schedules the first terminal device to send sidelink data to a second terminal device; determining a time domain position of a physical uplink control channel for receiving, from the first terminal device, hybrid automatic repeat request (HARQ) information for the sidelink data; and receiving the HARQ information from the first terminal device on the physical uplink control channel; and wherein the method further comprises: sending an HARQ timing to the first terminal device on the physical downlink control channel, wherein the HARQ timing is an offset value between the time domain position of the physical uplink control channel and a time domain position of a physical sidelink feedback channel, and the physical sidelink feedback channel is configured to carry the HARQ information from the second terminal device to the first terminal device.

41 . The method according to claim 40 , wherein determining the time domain position of the physical uplink control channel for receiving the HARQ information for the sidelink data comprises:
determining, based on the time domain position of the physical sidelink feedback channel and the HARQ timing, the time domain position of the physical uplink control channel for receiving the HARQ information from the first terminal device.

42 . The method according to claim 40 , wherein
the sidelink scheduling information is downlink control information.

43 . A method comprising:
receiving, by a first terminal device, sidelink scheduling information on a physical downlink control channel, wherein the sidelink scheduling information schedules the first terminal device to send sidelink data to a second terminal device; receiving, by the second terminal device, the sidelink data from the first terminal device, and sending, by the second terminal device, hybrid automatic repeat request (HARQ) information for the sidelink data to the first terminal device on a physical sidelink feedback channel; receiving, by the first terminal device, the HARQ information; and determining, by the first terminal device based on a time domain position of the physical sidelink feedback channel and an HARQ timing, a time domain position of a physical uplink control channel for sending the HARQ information, and sending, by the first terminal device, the HARQ information in the time domain position of the physical uplink control channel, wherein the HARQ timing is an offset value between the time domain position of the physical uplink control channel and the time domain position of the physical sidelink feedback channel.

44 . The method according to claim 43 , wherein the HARQ timing is a quantity of slots between a slot in which a last symbol of the physical sidelink feedback channel is located and a slot in which a start symbol of the physical uplink control channel is located.

45 . The method according to claim 43 , wherein
the HARQ timing is received by the first terminal device through the physical downlink control channel.

46 . The method according to claim 43 , wherein
the sidelink scheduling information is downlink control information.

47 . The method according to claim 43 , wherein when the physical uplink control channel and a first channel overlap in time domain, the method further comprising:
determining, by the first terminal device based on a subcarrier spacing or processing capability information of the first terminal device and the physical sidelink feedback channel, a time domain offset value that is between the time domain position of the physical sidelink feedback channel and a time domain position of a channel, the channel being the physical uplink control channel or the first channel and having an earlier time domain position in the physical uplink control channel and the first channel.

48 . The method according to claim 47 , wherein the time domain offset value T 3 is determined according to following formula:
T 3 =( N SL-to-UL +d SL-to-UL +y )×(2048+144)×κ×2 −μ 2 ×T C ,
wherein y is a positive integer, N SL-to-UL is a quantity of symbols that is determined based on the subcarrier spacing or the processing capability information of the first terminal device, d SL-to-UL is a quantity of symbols that is determined based on the physical sidelink feedback channel or the processing capability information of the first terminal device, κ is a ratio of T s to T c , T c is a first time unit, T s is a second time unit, and μ 2 is the subcarrier spacing.

49 . An apparatus, comprising:
at least one pr

Assignees

• Huawei Tech Co Ltd

Inventors

• Yang Fan
• Zhang Xingwei

Classifications

• H04W72/20

  Control channels or signalling for resource management · CPC title

• H04L5/0053 Primary

  Allocation of signalling, i.e. of overhead other than pilot signals · CPC title

• H04W72/23 Primary

  in the downlink direction of a wireless link, i.e. towards a terminal · CPC title

• H04W4/40

  for vehicles, e.g. vehicle-to-pedestrians [V2P] · CPC title

• H04L1/1822

  involving configuration of automatic repeat request [ARQ] with parallel processes · CPC title