Sidelink synchronization signal block priority
Various aspects of the present disclosure generally relate to wireless communication. In some aspects, a user equipment (UE) may transmit a sidelink synchronization signal block (S-SSB) with a high priority listen-before-talk (LBT) parameter. The UE may communicate with an other UE based at least in part on the S-SSB with the high priority LBT parameter. Numerous other aspects are described.
1. An apparatus for wireless communication at a user equipment (UE), comprising:
one or more memories; and
one or more processors, coupled to the one or more memories, the one or more processors individually or collectively configured to:
transmit a sidelink synchronization signal block (S-SSB) to an other UE, wherein the S-SSB corresponds to a high priority listen-before-talk (LBT) parameter, wherein a priority of the high priority LBT parameter is associated with a highest priority of a physical sidelink shared channel (PSSCH) that carries the S-SSB; and
communicate with the other UE based at least in part on the S-SSB with the high priority LBT parameter.
2. The apparatus of claim 1 , wherein the priority of the high priority LBT parameter is higher than Hall the highest priority of the PSSCH.
3. The apparatus of claim 1 , wherein the one or more processors, to transmit the S-SSB with the high priority LBT parameter, are configured to:
transmit the S-SSB using a category one LBT.
4. The apparatus of claim 1 , wherein the one or more processors, to transmit the S-SSB with the high priority LBT parameter, are configured to:
transmit the S-SSB using a category two LBT.
5. The apparatus of claim 4 , wherein the one or more processors, to transmit the S-SSB using the category two LBT, are configured to:
transmit the S-SSB using the category two LBT having a duty cycle that is less than 1/20.
6. The apparatus of claim 1 , wherein the one or more processors, to transmit the S-SSB with the high priority LBT parameter, are configured to:
transmit the S-SSB using a category four LBT.
7. The apparatus of claim 6 , wherein the one or more processors, to transmit the S-SSB using the category four LBT, are configured to:
transmit the S-SSB in a smallest contention window of the category four LBT.
8. The apparatus of claim 1 , wherein the one or more processors, to transmit the S-SSB with the high priority LBT parameter, are configured to:
transmit the S-SSB with a highest channel access priority class (CAPC) for S-SSB transmissions.
9. The apparatus of claim 1 , wherein the one or more processors, to transmit the S-SSB with the high priority LBT parameter, are configured to:
transmit the S-SSB in a physical sidelink control channel (PSCCH) that uses an earliest contention slot or offset of the PSSCH.
10. The apparatus of claim 9 , wherein the one or more processors, to transmit the S-SSB in the PSCCH that uses the earliest contention slot or offset of the PSSCH, are configured to:
transmit the S-SSB in the PSCCH that uses the earliest contention slot or offset of the PSSCH based at least in part on a cyclic prefix extension preceding the PSSCH.
11. The apparatus of claim 10 , wherein the one or more processors are further configured to determine a plurality of starting positions with different cyclic prefix extension lengths for transmitting the S-SSB.
12. The apparatus of claim 1 , wherein the priority of the high priority LBT parameter is the highest priority of the PSSCH that carries the S-SSB.
13. An apparatus for wireless communication at a user equipment (UE), comprising:
one or more memories; and
one or more processors, coupled to the one or more memories, the one or more processors individually or collectively configured to:
transmit an indication of a periodic reservation for sidelink synchronization signal block (S-SSB) transmissions, wherein the indication of the periodic reservation for the S-SSB transmissions indicates a highest priority in a physical sidelink shared channel (PSSCH) for the S-SSB transmissions; and
communicate with an other UE based at least in part on the periodic reservation.
14. The apparatus of claim 13 , wherein the one or more processors, to transmit the indication of the periodic reservation for the S-SSB transmissions, are configured to:
transmit a sidelink communication that indicates the periodic reservation for the S-SSB transmissions.
15. The apparatus of claim 14 , wherein the sidelink communication is a first stage sidelink communication.
16. The apparatus of claim 13 , wherein the indication of the periodic reservation for the S-SSB transmissions is configured for interpreting a time domain resource allocation field or a periodic reservation field of the PSSCH for the S-SSB transmissions.
17. The apparatus of claim 13 , wherein the indication of the periodic reservation for the S-SSB transmissions indicates a highest Layer 1 priority for the S-SSB transmissions.
18. The apparatus of claim 13 , wherein the indication of the periodic reservation for the S-SSB transmissions indicates a highest Layer 1 priority for the S-SSB transmissions.
19. A method of wireless communication performed by a user equipment (UE), comprising:
transmitting a sidelink synchronization signal block (S-SSB) to an other UE, wherein the S-SSB corresponds to a high priority listen-before-talk (LBT) parameter, wherein a priority of the high priority LBT parameter is based at least in part on a highest priority of a physical sidelink shared channel (PSSCH) that carries the S-SSB; and
communicating with the other UE based at least in part on the S-SSB with the high priority LBT parameter.
20. The method of claim 19 , wherein the priority of the high priority LBT parameter is higher than the highest priority of the PSSCH that carries the S-SSB.
21. The method of claim 19 , wherein transmitting the S-SSB with the high priority LBT parameter comprises:
transmitting the S-SSB using a category one LBT.
22. The method of claim 19 , wherein transmitting the S-SSB with the high priority LBT parameter comprises:
transmitting the S-SSB using a category two LBT.
23. The method of claim 19 , wherein transmitting the S-SSB with the high priority LBT parameter comprises:
transmitting the S-SSB using a category four LBT.
24. The method of claim 19 , wherein transmitting the S-SSB with the high priority LBT parameter comprises:
transmitting the S-SSB with a highest channel access priority class (CAPC) for S-SSB transmissions.
25. The method of claim 19 , wherein transmitting the S-SSB with the high priority LBT parameter comprises:
transmitting the S-SSB in a physical sidelink control channel (PSCCH) that uses an earliest contention slot or offset of the PSSCH.
26. The method of claim 19 , wherein the priority of the high priority LBT parameter is the highest priority of the PSSCH that carries the S-SSB.
27. A method of wireless communication performed by a user equipment (UE), comprising:
transmitting an indication of a periodic reservation for sidelink synchronization signal block (S-SSB) transmissions, wherein the indication of the periodic reservation for the S-SSB transmissions indicates a highest priority in a physical sidelink shared channel (P S S CH) for the S-SSB transmissions; and
communicating with an other UE based at least in part on the periodic reservation.
28. The method of claim 27 , wherein transmitting the indication of the periodic reservation for the S-SSB transmissions comprises:
transmitting a sidelink communication that indicates the periodic reservation for the S-SSB transmissions.
29. The method of claim 28 , wherein the sidelink communication is a first stage sidelink communication.
30. The method of claim 27 , wherein the indication of the periodic reservation for the S-SSB transmissions is configured for interpreting a time domain resource allocation field or a periodic reservation field of the PSSCH for the S-SSB transmissions.