Sidelink TCI indication for sidelink multi-TRP relaying
Apparatus, methods, and computer-readable media for sidelink multiple transmission reception points (TRPs) relaying are disclosed herein. An example method for wireless communication at a base station includes transmitting communication for a target user equipment (UE) to multiple TRPs for relaying the communication to the target UE over a sidelink. The method may further include configuring, for one or more of the target UE or at least one of the multiple TRPs, a first transmission configuration indicator (TCI) state for a physical sidelink control channel (PSCCH) between the UE and the at least one of the multiple TRPs.
1. An apparatus for wireless communication at a transmission reception point (TRP), comprising:
memory; and
at least one processor coupled to the memory and configured to cause the TRP to:
receive a data communication from a base station for a user equipment (UE) to be relayed to the UE over sidelink by multiple transmission reception points (TRPs), wherein the multiple TRPs comprise the TRP;
indicate, to the UE, a physical sidelink shared channel (PSSCH) transmission configuration indicator (TCI) state for the data communication to be relayed to the UE, the PSSCH TCI state corresponding to at least one of the multiple TRPs; and
transmit the data communication to the UE on the sidelink.
2. The apparatus of claim 1 , wherein the at least one processor is configured to further cause the TRP to transmit a physical sidelink control channel (PSCCH) to the UE to schedule resources for transmitting the data communication to the UE on the sidelink, wherein the PSSCH TCI state is same as a TCI state for the PSCCH.
3. The apparatus of claim 1 , wherein the PSSCH TCI state is indicated in sidelink control information (SCI).
4. The apparatus of claim 3 , wherein the PSSCH TCI state comprises a first PSSCH TCI state and the TRP comprises a first TRP, wherein the SCI indicates the first PSSCH TCI state for the first TRP and a second PSSCH TCI state for a second TRP of the multiple of TRPs.
5. The apparatus of claim 3 , wherein the at least one processor is configured to cause the TRP to transmit the SCI in a physical sidelink control channel (PSCCH) from the TRP.
6. The apparatus of claim 3 , wherein the at least one processor is configured to cause the TRP to transmit the SCI in a PSSCH from the TRP.
7. The apparatus of claim 3 , wherein the SCI indicates a single PSSCH TCI state for the TRP.
8. The apparatus of claim 1 , wherein the at least one processor is further configured to cause the TRP to:
indicate a physical sidelink feedback channel (PSFCH) TCI state for at least one of multiple TRPs.
9. The apparatus of claim 8 , wherein the PSFCH TCI state is same as a physical sidelink control channel (PSCCH) TCI state or is indicated in sidelink control information (SCI).
10. The apparatus of claim 1 , further comprising at least one transceiver coupled to the at least one processor.
11. A method of wireless communication at a transmission reception point (TRP), comprising:
receiving a data communication from a base station for a user equipment (UE) to be relayed to the UE over sidelink by multiple transmission reception points (TRPs), wherein the multiple TRPs comprise the TRP;
indicating, to the UE, a physical sidelink shared channel (PSSCH) transmission configuration indicator (TCI) state for the data communication to be relayed to the UE, the PSSCH TCI state corresponding to at least one of the multiple TRPs; and
transmitting the data communication to the UE on the sidelink.
12. The method of claim 11 , further comprising transmitting a physical sidelink control channel (PSCCH) to the UE to schedule resources for transmitting the data communication to the UE on the sidelink, wherein the PSSCH TCI state is same as a TCI state for the PSCCH.
13. The method of claim 11 , wherein the PSSCH TCI state is indicated in sidelink control information (SCI).
14. The method of claim 13 , wherein the PSSCH TCI state comprises a first PSSCH TCI state and the TRP comprises a first TRP, wherein the SCI indicates the first PSSCH TCI state for the first TRP and a second PSSCH TCI state for a second TRP of the multiple of TRPs.
15. The method of claim 13 , wherein the SCI is transmitted in a physical sidelink control channel (PSCCH) from the TRP.
16. The method of claim 13 , wherein the SCI is transmitted in a PSSCH from the TRP.
17. The method of claim 13 , wherein the SCI indicates a single PSSCH TCI state for the TRP.
18. The method of claim 11 , further comprising:
indicating a physical sidelink feedback channel (PSFCH) TCI state for at least one of multiple TRPs.
19. The method of claim 18 , wherein the PSFCH TCI state is same as a physical sidelink control channel (PSCCH) TCI state or is indicated in sidelink control information (SCI).
20. A non-transitory computer-readable medium storing computer executable code for wireless communication at a transmission reception point (TRP), the computer executable code when executed by at least one processor cause the TRP to:
receive a data communication from a base station for a user equipment (UE) to be relayed to the UE over sidelink by multiple transmission reception points (TRPs), wherein the multiple TRPs comprise the TRP;
indicate, to the UE, a physical sidelink shared channel (PSSCH) transmission configuration indicator (TCI) state for the data communication to be relayed to the UE, the PSSCH TCI state corresponding to at least one of the multiple TRPs; and
transmit the data communication to the UE on the sidelink.
21. The non-transitory computer-readable medium of claim 20 , wherein the computer executable code when executed by at least one processor further causes the TRP to transmit a physical sidelink control channel (PSCCH) to the UE to schedule resources for transmitting the data communication to the UE on the sidelink, wherein the PSSCH TCI state is same as a TCI state for the PSCCH.
22. The non-transitory computer-readable medium of claim 20 , wherein the PSSCH TCI state is indicated in sidelink control information (SCI).
23. The non-transitory computer-readable medium of claim 22 , wherein the PSSCH TCI state comprises a first PSSCH TCI state and the TRP comprises a first TRP, wherein the SCI indicates the first PSSCH TCI state for the first TRP and a second PSSCH TCI state for a second TRP of the multiple TRPs.
24. The non-transitory computer-readable medium of claim 22 , wherein the computer executable code when executed by the at least one processor is configured to cause the TRP to transmit the SCI in a physical sidelink control channel (PSCCH) from the TRP.
25. The non-transitory computer-readable medium of claim 22 , wherein the computer executable code when executed by the at least one processor is configured to cause the TRP to transmit the SCI in a PSSCH from the TRP.
26. The non-transitory computer-readable medium of claim 22 , wherein the SCI indicates a single PSSCH TCI state for the TRP.
27. The non-transitory computer-readable medium of claim 20 , wherein the computer executable code when executed by the at least one processor is further configured to cause the TRP to:
indicate a physical sidelink feedback channel (PSFCH) TCI state for at least one of multiple TRPs.
28. The non-transitory computer-readable medium of claim 27 , wherein the PSFCH TCI state is same as a physical sidelink control channel (PSCCH) TCI state or is indicated in sidelink control information (SCI).
29. An apparatus for wireless communication at a transmission reception point (TRP), comprising:
means for receiving a data communication from a base station for a user equipment (UE) to be relayed to the UE over sidelink by multiple transmission reception points (TRPs), wherein the multiple TRPs comprise the TRP;
means for indicating, to the UE, a physical sidelink shared channel (PSSCH) transmission configuration indicator (TCI) state for the data communication to be relayed to the UE, the PSSCH TCI state corresponding to at least one of the multiple TRPs; and
means for transmitting the data communication to the UE on the sidelink.
30. The apparatus of claim 29 , further comprising:
means for indicating a physical sidelink feedback channel (PSFCH) TCI state for at least one of multiple TRPs.