Fast secondary cell recovery for ultra-reliable low-latency communication
Various aspects of the present disclosure generally relate to wireless communication. In some aspects, a user equipment may provide, to a first cell, a beam failure indication associated with a beam of a secondary cell. The beam failure indication may be provided via a dedicated physical uplink control channel (PUCCH) resource. The user equipment may provide, based at least in part on providing the beam failure indication, a beam index report to a second cell. The beam index report may be provided to cause recovery of the secondary cell to be triggered. The beam index report may include information that identifies a preferred beam associated with the recovery of the secondary cell. Numerous other aspects are provided.
1. A method of wireless communication performed by a user equipment (UE), comprising:
providing, to a first cell, a beam failure indication, associated with a beam of a secondary cell,
wherein the beam failure indication is provided as a single bit in a physical uplink control channel; and
providing, based at least in part on providing the beam failure indication, a beam index report to a second cell or the first cell,
wherein the beam index report is to cause a recovery of the secondary cell to be triggered,
wherein the beam index report includes first information that identifies a beam index corresponding to a preferred beam associated with the recovery of the secondary cell, and
wherein the beam index report is carried in a medium access control-control element (MAC-CE) dedicated to the recovery, or
wherein the beam index report includes second information that identifies a secondary cell index associated with the secondary cell.
2. The method of claim 1 , wherein the beam is associated with ultra-reliable low-latency traffic.
3. The method of claim 1 , wherein the first cell and the second cell are a same cell.
4. The method of claim 1 , wherein the first cell is a primary cell, wherein the primary cell is in a same cell group as the secondary cell.
5. The method of claim 1 , wherein the second cell is a cell that supports uplink transmissions.
6. The method of claim 1 , wherein the beam index report is provided based at least in part on a beam index report request that is received from the second cell,
wherein the beam index report request is received after the beam failure indication is provided.
7. The method of claim 1 , wherein the beam index report is carried in the MAC-CE.
8. The method of claim 1 , wherein the beam index report is automatically provided based at least in part on a reporting delay,
wherein the reporting delay identifies an amount of time, after providing the beam failure indication, that the UE is to wait before automatically providing the beam index report.
9. The method of claim 1 , wherein the beam index report is provided in a same communication as the beam failure indication.
10. The method of claim 1 , wherein the recovery of the secondary cell is based at least in part on at least one of:
a dynamic random access channel (RACH) procedure associated with beam pairing between the secondary cell and the UE, or
a downlink control information (DCI) beam update associated with the secondary cell.
11. The method of claim 1 , wherein the beam index report includes the second information.
12. The method of claim 11 , further comprising:
providing the second information.
13. A user equipment (UE) for wireless communication, comprising:
a memory; and
one or more processors coupled to the memory, the one or more processors configured to:
provide, to a first cell, a beam failure indication associated with a beam of a secondary cell,
wherein the beam failure indication is provided as a single bit in a physical uplink control channel; and
provide, based at least in part on providing the beam failure indication, a beam index report to a second cell or the first cell,
wherein the beam index report is to cause a recovery of the secondary cell to be triggered,
wherein the beam index report includes first information that identifies a beam index corresponding to a preferred beam associated with the recovery of the secondary cell; and
wherein the beam index report is carried in a medium access control-control element (MAC-CE) dedicated to the recovery, or
wherein the beam index report includes second information that identifies a secondary cell index associated with the secondary cell.
14. The UE of claim 13 , wherein the beam is associated with ultra-reliable low-latency traffic.
15. The UE of claim 13 , wherein the beam index report is provided based at least in part on a beam index report request that is received from the second cell,
wherein the beam index report request is received after the beam failure indication is provided.
16. The UE of claim 13 , wherein the beam index report is automatically provided based at least in part on a reporting delay,
wherein the reporting delay identifies an amount of time, after providing the beam failure indication, that the UE is to wait before automatically providing the beam index report.
17. The UE of claim 13 , wherein the beam index report is provided in a same communication as the beam failure indication.
18. The UE of claim 13 , wherein the recovery of the secondary cell is based at least in part on at least one of:
a dynamic random access channel (RACH) procedure associated with beam pairing between the secondary cell and the UE, or
a downlink control information (DCI) beam update associated with the secondary cell.
19. The UE of claim 13 , wherein the beam index report is carried in the MAC-CE.
20. The UE of claim 13 , wherein the beam index report includes the second information.
21. The UE of claim 20 , wherein the one or more processors are further configured to:
provide the second information.
22. A non-transitory computer-readable medium storing one or more instructions for wireless communication, the one or more instructions comprising:
one or more instructions that, when executed by one or more processors of a user equipment (UE), cause the one or more processors to:
provide, to a first cell, a beam failure indication associated with a beam of a secondary cell,
wherein the beam failure indication is provided as a single bit in a physical uplink control channel; and
provide, based at least in part on providing the beam failure indication, a beam index report to a second cell or the first cell,
wherein the beam index report is to cause a recovery of the secondary cell to be triggered, or
wherein the beam index report includes first information that identifies a beam index corresponding to a preferred beam associated with the recovery of the secondary cell; and
wherein the beam index report is carried in a medium access control-control element (MAC-CE) dedicated to the recovery, or
wherein the beam index report includes second information that identifies a secondary cell index associated with the secondary cell.
23. The non-transitory computer-readable medium of claim 22 , wherein the beam is associated with ultra-reliable low-latency traffic.
24. The non-transitory computer-readable medium of claim 22 , wherein the beam index report is carried in the MAC-CE.
25. The non-transitory computer-readable medium of claim 22 , wherein the beam index report includes the second information.
26. The non-transitory computer-readable medium of claim 25 , wherein the one or more instructions, when executed by the one or more, further cause the one or more processors to:
provide the second information.
27. An apparatus for wireless communication, comprising:
means for providing, to a first cell, a beam failure indication associated with a beam of a secondary cell,
wherein the beam failure indication is provided as a single bit in a physical uplink control channel; and
means for providing, based at least in part on providing the beam failure indication, a beam index report to a second cell or the first cell,
wherein the beam index report is to cause recovery of the secondary cell to be triggered,
wherein the beam index report includes first information that identifies a beam index corresponding to a preferred beam associated with the recovery of the secondary cell; and
wherein the beam index report is carried in a medium access control-control element (MAC-CE) dedicated to the recovery, or
wherein the beam index report includes second information that identifies a secondary cell index associated with the secondary cell.
28. The apparatus of claim 27 , wherein the beam index report is carried in the MAC-CE.
29. The apparatus of claim 27 , wherein the beam index report includes the second information.
30. The apparatus of claim 29 , further comprising:
means for providing the second information.