CHANNEL OCCUPANCY SHARING FOR SIDELINK FEEDBACK CHANNEL TRANSMISSIONS
Various aspects of the present disclosure relate to receiving sidelink control information (SCI) allocating resources for a physical sidelink shared channel (PSSCH) transmission, the SCI including a field indicating a channel occupancy time (COT) duration of a first COT, and transmitting hybrid automatic repeat request (HARQ) feedback in a physical sidelink feedback channel (PSFCH) transmission within the COT duration without initiating another COT based on the SCI. A receiving UE may determine the COT duration indicated by the SCI as shared for the transmission of the HARQ feedback on the PSFCH.
1 .- 20 . (canceled)
21 . A user equipment (UE) for wireless communication, comprising:
at least one memory; and
at least one processor coupled with the at least one memory and configured to cause the UE to:
receive sidelink control information (SCI) indicating sidelink resources for a physical sidelink shared channel (PSSCH) transmission, the SCI including a field indicating a channel occupancy time (COT) duration; and
transmit hybrid automatic repeat request (HARQ) feedback within the COT duration in a physical sidelink feedback channel (PSFCH) transmission without initiating another COT based on the SCI.
22 . The UE of claim 21 , wherein the at least one processor is further configured to cause the UE to extract the COT duration from the SCI, and
transmit the HARQ feedback without initiating another COT when the PSFCH transmission falls within the COT duration extracted from the SCI.
23 . The UE of claim 21 , wherein the at least one processor is configured to cause the UE to determine the COT duration indicated by the SCI as shared for the transmission of the HARQ feedback on the PSFCH.
24 . The UE of claim 21 , wherein the at least one processor is further configured to cause the UE to determine whether to initiate another COT before transmitting the HARQ feedback based on an information field within the SCI.
25 . The UE of claim 24 , wherein the information field indicates whether HARQ is enabled for the PSSCH transmission.
26 . The UE of claim 25 , wherein the at least one processor is further configured to cause the UE to determine not to initiate another COT before transmitting the HARQ feedback after confirming 1) the SCI indicates that HARQ is enabled for the PSSCH transmission, and 2) the PSFCH transmission is within the COT duration indicated by the SCI.
27 . The UE of claim 21 , wherein the HARQ feedback is sent for the PSSCH transmission.
28 . The UE of claim 21 , wherein the at least one processor is further configured to cause the UE to transmit a Sidelink Synchronization Signal Block (S-SSB) within the COT without initiating another COT.
29 . The UE of claim 28 , wherein the at least one processor is further configured to cause the UE to determine the COT duration indicated by the SCI as shared for the transmission of the S-SSB.
30 . The UE of claim 21 , wherein the at least one processor is further configured to cause the UE to:
transmit an identical copy of at least a first portion of the PSFCH transmission immediately after transmitting the HARQ feedback on the PSFCH.
31 . The UE of claim 21 , wherein the only transmissions permitted by the UE during the COT indicated by the SCI comprise the HARQ feedback and a repeat of the HARQ feedback.
32 . A method performed by a user equipment (UE), the method comprising:
receiving sidelink control information (SCI) indicating sidelink resources for a physical sidelink shared channel (PSSCH) transmission, the SCI including a field indicating a channel occupancy time (COT) duration of a first COT; and
transmitting hybrid automatic repeat request (HARQ) feedback in a physical sidelink feedback channel (PSFCH) transmission within the COT duration without initiating another COT based on the SCI.
33 . The method of claim 32 , further comprising:
extracting the COT duration from the SCI; and
transmitting the HARQ feedback without initiating another COT when the PSFCH transmission falls within the COT duration extracted from the SCI.
34 . The method of claim 32 , further comprising:
determining the COT duration indicated by the SCI as shared for the transmission of the HARQ feedback on the PSFCH.
35 . The UE of claim 32 , further comprising:
determining whether to initiate another COT before transmitting the HARQ feedback based on an information field within the SCI.
36 . The method of claim 35 , wherein the information field indicates whether HARQ is enabled for the PSSCH transmission.
37 . The method of claim 36 , further comprising:
determining not to initiate another COT before transmitting the HARQ feedback after confirming 1) the SCI indicates that HARQ is enabled for the PSSCH transmission, and 2) the PSFCH transmission is within the COT duration indicated by the SCI.
38 . The UE of claim 32 , further comprising:
transmitting a Sidelink Synchronization Signal Block (S-SSB) within the COT.
39 . The method of claim 38 , further comprising:
determining the COT duration indicated by the SCI as shared for the transmission of the S-SSB.
40 . A processor for wireless communication, comprising:
at least one memory; and
a controller coupled with the at least one memory and configured to cause the controller to:
receive sidelink control information (SCI) indicating sidelink resources for a physical sidelink shared channel (PSSCH) transmission, the SCI including a field indicating a channel occupancy time (COT) duration; and
transmit hybrid automatic repeat request (HARQ) feedback within the COT duration in a physical sidelink feedback channel (PSFCH) transmission without initiating another COT based on the SCI.