Sidelink HARQ
A user equipment (UE) communicates with a further UE via a sidelink and communicates with a cell of a network via an uplink. The UE receives a hybrid automatic repeat request (HARQ) acknowledgement (ACK) timing parameter from the network, generates a sidelink HARQ-ACK codebook based on a signaling exchange with the further UE, wherein the sidelink HARQ-ACK codebook is constructed in decreasing order of one or more physical sidelink shared channel (PSSCH) transmission slots associated with a configured physical sidelink feedback channel (PSFCH) occasion, and transmits an indication of the sidelink HARQ-ACK codebook to the cell of the network.
1. A processor of a user equipment (UE) configured to communicate with a further UE via a sidelink, the processor configured to:
determine candidate physical sidelink feedback channel (PSFCH) resources corresponding to a resource pool, wherein the candidate PSFCH resources are based on an allocated subchannel used for a physical sidelink shared channel (PSSCH); and
transmit hybrid automatic repeat request (HARQ) feedback on one or more of the PSFCH resources.
2. The processor of claim 1 , wherein the HARQ feedback is multiplexed on the PSFCH resources.
3. The processor of claim 1 , wherein the HARQ feedback is multiplexed on the PSFCH resources.
4. The processor of claim 1 , wherein the candidate PSFCH resources further correspond to unicast.
5. The processor of claim 1 , wherein the candidate PSFCH resources further correspond to groupcast option 1.
6. The processor of claim 1 , wherein the candidate PSFCH resources further correspond to groupcast option 2 and wherein determining the candidate PSFCH resources is further based on a slot used for PSSCH reception.
7. A method performed by a user equipment (UE) configured to communicate with a further UE via a sidelink, the method comprising:
determining candidate physical sidelink feedback channel (PSFCH) resources corresponding to a resource pool, wherein the candidate PSFCH resources are based on an allocated subchannel used for a physical sidelink shared channel (PSSCH); and
transmitting hybrid automatic repeat request (HARQ) feedback on one or more of the PSFCH resources.
8. The method of claim 7 , wherein the HARQ feedback is multiplexed on the PSFCH resources.
9. The method of claim 7 , wherein the HARQ feedback is multiplexed on the PSFCH resources.
10. The method of claim 7 , wherein the candidate PSFCH resources further correspond to unicast.
11. The method of claim 7 , wherein the candidate PSFCH resources further correspond to groupcast option 1.
12. The method of claim 7 , wherein the candidate PSFCH resources further correspond to groupcast option 2 and wherein determining the candidate PSFCH resources is further based on a slot used for PSSCH reception.
13. A user equipment (UE), comprising:
a transceiver configured to communicate with a further UE via a sidelink; and
a processor communicatively coupled to the transceiver and configured to perform operations comprising:
determining candidate physical sidelink feedback channel (PSFCH) resources corresponding to a resource pool, wherein the candidate PSFCH resources are based on an allocated subchannel used for a physical sidelink shared channel (PSSCH); and
transmitting hybrid automatic repeat request (HARQ) feedback on one or more of the PSFCH resources.
14. The UE of claim 13 , wherein the HARQ feedback is multiplexed on the PSFCH resources.
15. The UE of claim 13 , wherein the candidate PSFCH resources further correspond to unicast.
16. The UE of claim 13 , wherein the candidate PSFCH resources further correspond to groupcast option 1.
17. The UE of claim 13 , wherein the candidate PSFCH resources further correspond to groupcast option 2 and wherein determining the candidate PSFCH resources is further based on a slot used for PSSCH reception.