Communication using a default common beam
Various aspects of the present disclosure generally relate to wireless communication. In some aspects, a user equipment (UE) may receive, from a base station, information relating to one or more transmissions to be transmitted or received by the UE. The UE may communicate with the base station using a default common beam for the one or more transmissions. Numerous other aspects are described.
1 . An apparatus for wireless communication at a user equipment (UE), comprising:
one or more memories storing processor-executable code; and
one or more processors coupled with the one or more memories and individually or collectively operable to cause the UE to:
receive information relating to one or more transmissions to be transmitted or received by the UE; and
communicate via a default common beam for the one or more transmissions based at least in part on an expiration of an inactivity timer, wherein the default common beam is associated with:
a particular common beam transmission configuration indicator state identifier in an active bandwidth part of a component carrier,
a particular reference signal in the active bandwidth part of the component carrier, or
both the particular common beam transmission configuration indicator state identifier and the particular reference signal.
2 . The apparatus of claim 1 ,
wherein the default common beam is a common beam for one of:
at least one downlink channel or reference signal and at least one uplink channel or reference signal,
at least two downlink channels or reference signals, or
at least two uplink channels or reference signals.
3 . The apparatus of claim 1 ,
wherein the default common beam is associated with the particular common beam transmission configuration indicator state identifier in the active bandwidth part of the component carrier.
4 . The apparatus of claim 1 ,
wherein the default common beam is associated with the particular reference signal in the active bandwidth part of the component carrier.
5 . The apparatus of claim 1 ,
wherein the default common beam is for a transmit receive point, and
wherein the particular common beam transmission configuration indicator state identifier is associated with the transmit receive point in the active bandwidth part of the component carrier.
6 . The apparatus of claim 1 ,
wherein the default common beam is for a transmit receive point, and
wherein the particular reference signal is associated with the transmit receive point in the active bandwidth part of the component carrier.
7 . The apparatus of claim 1 ,
wherein the one or more processors are individually or collectively operable to cause the UE to:
initiate the inactivity timer based at least in part on one or more of:
a reception of a physical downlink control channel (PDCCH) communication that indicates a downlink assignment for the active bandwidth part,
a reception of a PDCCH communication that indicates an uplink grant for the active bandwidth part,
a transmission of a medium access control (MAC) protocol data unit (PDU) in a configured uplink grant,
a reception of a MAC PDU in a configured downlink assignment,
a determination that a random access procedure for a serving cell is complete, or
a determination that a random access procedure for a serving cell is complete upon receiving a PDCCH communication.
8 . The apparatus of claim 1 ,
wherein the one or more processors are individually or collectively operable to cause the UE to:
initiate the inactivity timer based at least in part on the UE entering a power saving mode.
9 . The apparatus of claim 1 ,
wherein an application time for a beam is based at least in part on the expiration of the inactivity timer.
10 . The apparatus of claim 1 ,
wherein the default common beam is configured for the one or more transmissions on a downlink bandwidth part that is active at the expiration of the inactivity timer for the default common beam.
11 . The apparatus of claim 1 ,
wherein the default common beam is configured for the one or more transmissions on a default downlink bandwidth part.
12 . The apparatus of claim 1 ,
wherein the one or more transmissions include transmissions for one or more of a physical downlink control channel, a physical downlink shared channel, a physical uplink control channel, a physical uplink shared channel, a synchronization signal block, a channel state information reference signal, a positioning reference signal, or a sounding reference signal.
13 . The apparatus of claim 1 ,
wherein a beam failure detection reference signal, that is configured for the UE when the default common beam is configured for the UE, is one of:
a quasi-co-location (QCL) reference signal associated with an indicated beam,
a QCL reference signal associated with the default common beam,
the QCL reference signal associated with the indicated beam and the QCL reference signal associated with the default common beam, or
a QCL reference signal associated with a particular control resource set in the active bandwidth part.
14 . The apparatus of claim 1 ,
wherein the UE is to cease one or more beam failure detection operations when the default common beam is configured for the UE.
15 . An apparatus for wireless communication at a network entity, comprising:
one or more memories storing processor-executable code; and
one or more processors coupled with the one or more memories and individually or collectively operable to cause the network entity to:
transmit information relating to one or more transmissions associated with a user equipment (UE); and
communicate via a default common beam for the one or more transmissions based at least in part on an expiration of an inactivity timer, wherein the default common beam is associated with:
a particular common beam transmission configuration indicator state identifier in an active bandwidth part of a component carrier,
a particular reference signal in the active bandwidth part of the component carrier, or
both the particular common beam transmission configuration indicator state identifier and the particular reference signal.
16 . The apparatus of claim 15 ,
wherein the default common beam is a common beam for one of:
at least one downlink channel or reference signal and at least one uplink channel or reference signal,
at least two downlink channels or reference signals, or
at least two uplink channels or reference signals.
17 . The apparatus of claim 15 ,
wherein the default common beam is associated with the particular common beam transmission configuration indicator state identifier in the active bandwidth part of the component carrier.
18 . The apparatus of claim 15 ,
wherein the default common beam is associated with the particular reference signal in the active bandwidth part of the component carrier.
19 . The apparatus of claim 15 ,
wherein the default common beam is for a transmit receive point, and
wherein the particular common beam transmission configuration indicator state identifier is associated with the transmit receive point in the active bandwidth part of the component carrier.
20 . The apparatus of claim 15 ,
wherein the default common beam is for a transmit receive point, and
wherein the particular reference signal is associated with the transmit receive point in the active bandwidth part of the component carrier.
21 . The apparatus of claim 15 ,
wherein the active bandwidth part is a downlink bandwidth part that is active at the expiration of the inactivity timer for the default common beam.
22 . The apparatus of claim 15 ,
wherein the active bandwidth part is a default downlink bandwidth part.
23 . The apparatus of claim 15 ,
wherein the one or more transmissions include transmissions for one or more of a physical downlink control channel, a physical downlink shared channel, a physical uplink control channel, a physical uplink shared channel, a synchronization signal block, a channel state information reference signal, a positioning reference signal, or a sounding reference signal.
24 . A method of wireless communication performed at a user equipment (UE), comprising:
receiving information relating to one or more transmissions to be transmitted or received by the UE; and
communicating using a default common beam for the one or more transmissions based at least in part on an expiration of an inactivity timer, the default common beam being associated with:
a particular common beam transmission configuration indicator state identifier in an active bandwidth part of a component carrier,
a particular reference signal in the active bandwidth part of the component carrier, or
both the particular common beam transmission configuration indicator state identifier and the particular reference signal.
25 . The method of claim 24 ,
wherein the default common beam is associated with the particular common beam transmission configuration indicator state identifier in the active bandwidth part of the component carrier.
26 . The method of claim 24 ,
wherein the default common beam is associated with the particular reference signal in the active bandwidth part of the component carrier.
27 . The method of claim 24 ,
wherein the default common beam is for a transmit receive point, and
wherein the particular common beam transmission configuration indicator state identifier is associated with the transmit receive point in the active bandwidth part of the component carrier.
28 . The method of claim 24 ,
wherein the default common beam is for a transmit receive point, and
wherein the particular reference signal is associated with the transmit receive point in the active bandwidth part of the component carrier.
29 . The method of claim 24 ,
wherein the default common beam is a common beam for one of:
at least one downlink channel or reference signal and at least one uplink channel or reference signal,
at least two downlink channels or reference signals, or
at least two uplink channels or reference signals.
30 . The method of claim 24 , further comprising:
initiating the inactivity timer based at least in part on one or more of:
a reception of a physical downlink control channel (PDCCH) communication that indicates a downlink assignment for the active bandwidth part,
a reception of a PDCCH communication that indicates an uplink grant for the active bandwidth part,
a transmission of a medium access control (MAC) protocol data unit (PDU) in a configured uplink grant,
a reception of a MAC PDU in a configured downlink assignment,
a determination that a random access procedure for a serving cell is complete, or
a determination that a random access procedure for a serving cell is complete upon receiving a PDCCH communication.
31 . The method of claim 24 , further comprising:
initiating the inactivity timer based at least in part on the UE entering a power saving mode.
32 . The method of claim 24 ,
wherein an application time for a beam is based at least in part on the expiration of the inactivity timer.
33 . A method of wireless communication performed at a network entity, comprising:
transmitting information relating to one or more transmissions associated with a user equipment (UE); and
communicating using a default common beam for the one or more transmissions based at least in part on an expiration of an inactivity timer, the default common beam being associated with:
a particular common beam transmission configuration indicator state identifier in an active bandwidth part of a component carrier,
a particular reference signal in the active bandwidth part of the component carrier, or
both the particular common beam transmission configuration indicator state identifier and the particular reference signal.
34 . The method of claim 33 ,
wherein the default common beam is associated with the particular common beam transmission configuration indicator state identifier in the active bandwidth part of the component carrier.
35 . The method of claim 33 ,
wherein the default common beam is associated with the particular reference signal in the active bandwidth part of the component carrier.