Event triggered uplink beam report
A user equipment (UE) determines an occurrence of an event based on one or more of criteria determined by the UE or a configuration from a base station, the event triggering an uplink beam report for the UE. Then, the UE sends the uplink beam report to a base station in response to determining the occurrence of the event. A base station configures a UE for an event that triggers an uplink beam report from the UE and receives the uplink beam report from the UE based on an occurrence of the event.
1. A method of wireless communication at a user equipment (UE), comprising:
determining, at the UE, an occurrence of an event associated with an uplink beam based on one or more of criteria determined by the UE or a configuration from a base station, the event triggering an uplink beam report for the UE; and
sending the uplink beam report including information about at least one uplink beam to the base station in response to determining the occurrence of the event.
2. The method of claim 1 , wherein the determining the occurrence of the event is based on the criteria determined by the UE.
3. The method of claim 1 , further comprising:
receiving the configuration from the base station for the event, wherein the determining the occurrence of the event is based on the configuration from the base station.
4. The method of claim 1 , wherein the event comprises a change in a set of one or more uplink beams, wherein the determining the occurrence comprises identifying the change in the set of one or more uplink beams.
5. The method of claim 4 , wherein the set of one or more uplink beams includes a first number of beams having highest beam measurements among a larger number of beams measured by the UE.
6. The method of claim 4 , wherein the uplink beam report comprises a beam quality metric for each uplink beam reported in the uplink beam report.
7. The method of claim 6 , wherein the beam quality metric comprises at least one of an available power headroom or a measurement based on an uplink reference signal received power (RSRP).
8. The method of claim 6 , further comprising:
receiving a beam quality metric configuration from the base station for the beam quality metric.
9. The method of claim 1 , wherein the uplink beam report indicates whether each uplink beam in the uplink beam report suffers beam failure.
10. The method of claim 9 , wherein the uplink beam report includes a bitmap for each configured uplink beam of the UE.
11. The method of claim 9 , further comprising:
receiving a beam failure configuration from the base station for determining the beam failure.
12. The method of claim 1 , wherein the uplink beam report identifies each uplink beam using an uplink beam identifier (ID).
13. The method of claim 12 , wherein the uplink beam ID is based on at least one of a spatial relation information identifier, an uplink transmission configuration indication (TCI) state ID, or an uplink beam indication reference signal ID.
14. The method of claim 1 , wherein the uplink beam report is transmitted in a physical uplink control channel (PUCCH), a medium access control-control element (MAC-CE), a scheduling request, or an uplink random access transmission.
15. An apparatus for wireless communication at a user equipment (UE), comprising:
a memory; and
at least one processor coupled to the memory and configured to:
determine, at the UE, an occurrence of an event associated with an uplink beam based on one or more of criteria determined by the UE or a configuration from a base station, the event triggering an uplink beam report for the UE; and
send the uplink beam report including information about at least one uplink beam to the base station in response to determining the occurrence of the event.
16. The apparatus of claim 15 , wherein the at least one processor is configured to determine the occurrence of the event based on the criteria determined by the UE.
17. The apparatus of claim 15 , wherein the at least one processor is further configured to:
receive the configuration from the base station for the event, a determination of the occurrence of the event being based on the configuration from the base station.
18. A method of wireless communication at a base station, comprising:
configuring a user equipment (UE) for an event associated with an uplink beam that triggers an uplink beam report from the UE; and
receiving the uplink beam report including information about at least one uplink beam from the UE based on an occurrence of the event.
19. The method of claim 18 , wherein the event comprises a change in a set of one or more uplink beams.
20. The method of claim 19 , wherein the set of one or more uplink beams includes a first number of uplink beams having highest beam measurements among a larger number of uplink beams measured by the UE.
21. The method of claim 19 , wherein the uplink beam report comprises a beam quality metric for each uplink beam reported in the uplink beam report.
22. The method of claim 21 , wherein the beam quality metric comprises at least one of an available power headroom or a measurement based on an uplink reference signal received power (RSRP).
23. The method of claim 21 , further comprising:
configuring the UE for the beam quality metric.
24. The method of claim 18 , wherein the uplink beam report indicates whether the at least one uplink beam in the uplink beam report suffers beam failure.
25. The method of claim 24 , wherein the uplink beam report includes a bitmap for each configured uplink beam of the UE.
26. The method of claim 24 , further comprising:
configuring the UE with a metric for determining the beam failure.
27. The method of claim 18 , wherein the uplink beam report identifies each uplink beam using an uplink beam identifier (ID).
28. The method of claim 27 , wherein the uplink beam ID is based on at least one of a spatial relation information identifier, an uplink transmission configuration indication (TCI) state ID, or an uplink beam indication reference signal ID.
29. The method of claim 18 , wherein the uplink beam report is received in a physical uplink control channel (PUCCH), a medium access control-control element (MAC-CE), a scheduling request, or an uplink random access transmission.
30. An apparatus for wireless communication at a base station, comprising:
a memory; and
at least one processor coupled to the memory and configured to:
configure a user equipment (UE) for an event associated with an uplink beam that triggers an uplink beam report from the UE; and
receive the uplink beam report including information about at least one uplink beam from the UE based on an occurrence of the event.