ACTIVE BEAM MANAGEMENT, CONFIGURATION, AND CAPABILITY SIGNALING
Some techniques and apparatuses described herein permit a user equipment (UE) to signal a capability corresponding to a number of active beams (e.g., active uplink beams) to a base station so that the UE may be appropriately configured, and so that the UE may communicate with the base station accordingly. Furthermore, some techniques and apparatuses described herein permit a UE and/or a base station to apply one or more rules and/or conditions to assist with ensuring that a UE capability, corresponding to a number of active beams (e.g., active uplink beams), is not violated, or to prevent the UE from communicating on a beam that is invalid due to a violated UE capability. Furthermore, some techniques and apparatuses described herein permit a UE and a base station to perform a beam management procedure upon beam activation to ensure that a beam is of sufficient quality for communications.
1 . A method of wireless communication performed by a user equipment (UE), comprising:
receiving a medium access control (MAC) control element (CE) (MAC-CE) to activate a beam;
refining, after acknowledgement of the MAC-CE and after an activation latency period, the beam during a non-schedulable period; and
communicating using the beam after refining the beam.
2 . The method of claim 1 , wherein the beam is a receive beam.
3 . The method of claim 1 , wherein the activation latency period is 3 milliseconds.
4 . The method of claim 1 , wherein the beam is refined using at least one of a synchronization signal burst set or a set of CSI-RS.
5 . The method of claim 4 , wherein the non-schedulable period is longer than a period of the synchronization signal burst set.
6 . The method of claim 4 , wherein the non-schedulable period is longer than a period of periodic CSI-RS resources.
7 . The method of claim 1 , wherein the beam is refined based at least in part on a threshold period of time elapsing between a beam management procedure performed on the beam and the receiving of the MAC-CE.
8 . The method of claim 1 , further comprising:
reporting a reference signal received power (RSRP) parameter for the beam; and
wherein refining the beam comprises:
refining the beam based at least in part on a threshold period of time elapsing after the reporting of the RSRP parameter.
9 . 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 cause the UE to:
receive a medium access control (MAC) control element (CE) (MAC-CE) to activate a beam;
refine, after acknowledgement of the MAC-CE and after an activation latency period, the beam during a non-schedulable period; and
communicate using the beam after refining the beam.
10 . The apparatus of claim 9 , wherein the beam is a receive beam.
11 . The apparatus of claim 9 , wherein the activation latency period is 3 milliseconds.
12 . The apparatus of claim 9 , wherein the one or more processors, to cause the UE to refine the beam, are configured to cause the UE to:
refine the beam using at least one of a synchronization signal burst set or a set of CSI-RS.
13 . The apparatus of claim 12 , wherein the non-schedulable period is longer than a period of the synchronization signal burst set.
14 . The apparatus of claim 12 , wherein the non-schedulable period is longer than a period of periodic CSI-RS resources.
15 . The apparatus of claim 9 , wherein the one or more processors, to cause the UE to refine the beam, are configured to cause the UE to:
refine the beam based at least in part on a threshold period of time elapsing between a beam management procedure performed on the beam and the reception of the MAC-CE.
16 . The apparatus of claim 9 , wherein the one or more processors are further configured to cause the UE to:
report a reference signal received power (RSRP) parameter for the beam; and
wherein the one or more processors, to cause the UE to refine the beam, are configured to cause the UE to:
refine the beam based at least in part on a threshold period of time elapsing after the reporting of the RSRP parameter.
17 . A non-transitory computer-readable medium storing a set of instructions for wireless communication, the set of instructions comprising:
one or more instructions that, when executed by one or more processors of a user equipment (UE), cause the UE to:
receive a medium access control (MAC) control element (CE) (MAC-CE) to activate a beam;
refine, after acknowledgement of the MAC-CE and after an activation latency period, the beam during a non-schedulable period; and
communicate using the beam after refining the beam.
18 . The non-transitory computer-readable medium of claim 17 , wherein the beam is a receive beam.
19 . The non-transitory computer-readable medium of claim 17 , wherein the activation latency period is 3 milliseconds.
20 . The non-transitory computer-readable medium of claim 17 , wherein the one or more instructions, that cause the UE to refine the beam, cause the UE to:
refine the beam using at least one of a synchronization signal burst set or a set of CSI-RS.
21 . The non-transitory computer-readable medium of claim 20 , wherein the non-schedulable period is longer than a period of the synchronization signal burst set.
22 . The non-transitory computer-readable medium of claim 20 , wherein the non-schedulable period is longer than a period of periodic CSI-RS resources.
23 . The non-transitory computer-readable medium of claim 17 , wherein the one or more instructions, that cause the UE to refine the beam, cause the UE to:
refine the beam based at least in part on a threshold period of time elapsing between a beam management procedure performed on the beam and the reception of the MAC-CE.
24 . The non-transitory computer-readable medium of claim 17 , wherein the one or more instructions further cause the UE to:
report a reference signal received power (RSRP) parameter for the beam; and
wherein the one or more instructions, that cause the UE to refine the beam, cause the UE to:
refine the beam based at least in part on a threshold period of time elapsing after the reporting of the RSRP parameter.
25 . An apparatus for wireless communication, comprising:
means for receiving a medium access control (MAC) control element (CE) (MAC-CE) to activate a beam;
means for refining, after acknowledgement of the MAC-CE and after an activation latency period, the beam during a non-schedulable period; and
means for communicating using the beam after refining the beam.
26 . The apparatus of claim 25 , wherein the means for refining the beam comprises:
means for refining the beam using at least one of a synchronization signal burst set or a set of CSI-RS.
27 . The apparatus of claim 26 , wherein the non-schedulable period is longer than a period of the synchronization signal burst set.
28 . The apparatus of claim 26 , wherein the non-schedulable period is longer than a period of periodic CSI-RS resources.
29 . The apparatus of claim 25 , wherein the means for refining the beam comprises:
means for refining the beam based at least in part on a threshold period of time elapsing between a beam management procedure performed on the beam and the reception of the MAC-CE.
30 . The apparatus of claim 25 , further comprising:
means for reporting a reference signal received power (RSRP) parameter for the beam; and
wherein the means for refining the beam comprises:
means for refining the beam based at least in part on a threshold period of time elapsing after the reporting of the RSRP parameter.