Common default beam per component carrier group
Wireless communications systems may support identification or determination of a common default beam for a component carrier (CC) group (e.g., such that all CCs of a CC group may be associated with a same default beam). For example, a CC group may be configured or established to include one or more CCs (e.g., for carrier aggregation), where each CC group may share a same analog beamformer. As such, a beam (e.g., a default uplink/downlink beam) may be established as default or common across CCs of a CC group (e.g., versus default beams being configured or established for individual CCs). Such an established default beam of a CC group (e.g., a default beam common to all CCs of a CC group) may include or refer to a default downlink shared channel beam, a default sounding reference signal (SRS) beam, a default downlink control channel beam, etc.
1 . A method for wireless communication at a user equipment (UE), comprising:
receiving a first downlink control information (DCI) message indicating a common transmission configuration indication (TCI) state for the UE, the common TCI state corresponding to multiple component carriers for the UE;
receiving, via a first beam, a second DCI message scheduling a downlink shared channel and indicating a second beam corresponding to the downlink shared channel; and
receiving, via at least one component carrier of the multiple component carriers for the UE and in accordance with receiving the second DCI message, the downlink shared channel using a common beam corresponding to the common TCI state indicated by the first DCI message, wherein the common beam, corresponding to the common TCI state that corresponds to the multiple component carriers, is used to receive the downlink shared channel based at least in part on an offset between the second DCI message and the downlink shared channel being less than a beam switch latency that is associated with a capability of the UE.
2 . The method of claim 1 , further comprising:
determining the common beam based at least in part on the common TCI state, wherein the common beam is used to receive the downlink shared channel via the at least one component carrier of the multiple component carriers for the UE.
3 . The method of claim 1 , wherein the common beam is used to receive the downlink shared channel based at least in part on the offset being below a threshold.
4 . The method of claim 3 , further comprising:
transmitting a report indicating the capability of the UE, wherein the threshold is based at least in part on the capability.
5 . The method of claim 1 , further comprising:
receiving an indication of the multiple component carriers for the UE.
6 . The method of claim 1 , further comprising:
determining the common beam based at least in part on a lowest control resource set identifier.
7 . A method for wireless communication at a network entity, comprising:
transmitting a first downlink control information (DCI) message indicating a common transmission configuration indication (TCI) state for a user equipment (UE), the common TCI state corresponding to multiple component carriers (CCs) for the UE;
transmitting, via a first beam, a second DCI message scheduling a downlink shared channel and indicating a second beam corresponding to the downlink shared channel; and
transmitting, via at least one component carrier of the multiple component carriers for the UE and in accordance with transmitting the second DCI message, the downlink shared channel using a common beam corresponding to the common TCI state indicated by the first DCI message, wherein the common beam, corresponding to the common TCI state that corresponds to the multiple component carriers, is used to receive the downlink shared channel based at least in part on an offset between the second DCI message and the downlink shared channel being less than a beam switch latency that is associated with a capability of the UE.
8 . The method of claim 7 , wherein the common beam is based at least in part on the common TCI state and is used to receive the downlink shared channel via the at least one component carrier of the multiple component carriers for the UE.
9 . The method of claim 7 , wherein the common beam is used to transmit the downlink shared channel based at least in part on the offset being below a threshold.
10 . The method of claim 9 , further comprising:
receiving a report indicating the capability of the UE, wherein the threshold is based at least in part on the capability.
11 . The method of claim 7 , further comprising:
transmitting an indication of the multiple component carriers for the UE.
12 . 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 execute the code to cause the UE to:
receive a first downlink control information (DCI) message indicating a common transmission configuration indication (TCI) state for the UE, the common TCI state corresponding to multiple component carriers (CCs) for the UE;
receive, via a first beam, a second DCI message scheduling a downlink shared channel and indicating a second beam corresponding to the downlink shared channel; and
receive, via at least one component carrier of the multiple component carriers for the UE and in accordance with receiving the second DCI message, the downlink shared channel using a common beam corresponding to the common TCI state indicated by the first DCI message, wherein the common beam, corresponding to the common TCI state that corresponds to the multiple component carriers, is used to receive the downlink shared channel based at least in part on an offset between the second DCI message and the downlink shared channel being less than a beam switch latency that is associated with a capability of the UE.
13 . The UE of claim 12 , wherein the one or more processors are individually or collectively further operable to execute the code to cause the UE to:
determining the common beam based at least in part on the common TCI state, wherein the common beam is used to receive the downlink shared channel via the at least one component carrier of the multiple component carriers for the UE.
14 . The UE of claim 12 , wherein the common beam is used to receive the downlink shared channel based at least in part on the offset being below a threshold.
15 . The UE of claim 14 , wherein the one or more processors are individually or collectively further operable to execute the code to cause the UE to:
transmit a report indicating the capability of the UE, wherein the threshold is based at least in part on the capability.