Default beam for multi-downlink control information based multi-transmit receive point with unified transmission configuration indicator
Various aspects of the present disclosure generally relate to wireless communication. In some aspects, a user equipment (UE) may receive, in a first control resource set (CORESET) associated with a first CORESET pool index, first downlink control information (DCI) that indicates a first transmission configuration indicator (TCI) state to be applied starting from a first starting time. The UE may receive, in a second CORESET associated with a second CORESET pool index, second DCI that indicates a second TCI state to be applied starting from a second starting time. The UE may receive third DCI that schedules a downlink communication. The UE may receive the downlink communication using a default beam associated with the first CORESET pool index or the second CORESET pool index in connection with a default beam condition associated with the third DCI. Numerous other aspects are described.
1. A user equipment (UE) for wireless communication, comprising:
one or more memories; and
one or more processors, coupled to the one or more memories, configured to:
receive, in a first control resource set (CORESET) associated with a first CORESET pool index, first downlink control information (DCI) that indicates a first transmission configuration indicator (TCI) state applicable from a first starting time associated with the first DCI;
receive, in a second CORESET associated with a second CORESET pool index, second DCI that indicates a second TCI state applicable from a second starting time associated with the second DCI;
receive third DCI that schedules a downlink communication; and
receive the downlink communication according to the first TCI state or the second TCI state based at least in part on a time duration between the reception of the third DCI and the downlink communication.
2. The UE of claim 1 , wherein the one or more processors, to receive the downlink communication, are further configured to:
receive the downlink communication according to the first TCI state based at least in part on the time duration satisfying a threshold.
3. The UE of claim 2 , wherein the time duration satisfying a threshold comprises the time duration being smaller than the threshold.
4. The UE of claim 1 , wherein the one or more processors, to receive the downlink communication, are further configured too:
receive the downlink communication with a first beam associated with the first TCI state.
5. The UE of claim 4 , wherein the first TCI state indicates one or more quasi-co-location (QCL) properties of the first beam.
6. The UE of claim 5 , wherein the one or more QCL properties comprise a Doppler shift, a Doppler spread, an average delay, a delay spread, or spatial receive parameters a Doppler shift, a Doppler spread, an average delay, a delay spread, or one or more spatial receive parameters.
7. The UE of claim 1 , wherein the one or more processors, to receive the third DCI, are further configured to:
receive the third DCI in the first CORESET.
8. The UE of claim 1 , wherein the one or more processors, to receive the third DCI, are further configured to:
receive the third DCI in a third CORESET, wherein the third CORESET is associated with the first CORESET pool index.
9. The UE of claim 1 , wherein the downlink communication comprises a physical downlink shared channel communication (PDSCH).
10. The UE of claim 1 , wherein the time duration comprises a scheduling offset.
11. The UE of claim 1 , wherein the time duration fails to satisfy a threshold, wherein the one or more processors, to receive the downlink communication, are further configured to:
receive the downlink communication according to the first TCI state based at least in part on the first CORESET pool index corresponding to a lowest CORESET pool index value among the first CORESET pool index and the second CORESET pool index.
12. The UE of claim 1 , wherein the time duration fails to satisfy a threshold, wherein the one or more processors, to receive the downlink communication, are further configured to:
receive the downlink communication according to the second TCI state based at least in part on the second CORESET pool index corresponding to a lowest CORESET pool index value among the first CORESET pool index and the second CORESET pool index.
13. The UE of claim 1 , wherein the first CORESET pool index corresponds to a lowest CORESET pool index value among the first CORESET pool index and the second CORESET pool index.
14. A method for wireless communication at a user equipment (UE), comprising:
receiving, in a first control resource set (CORESET) associated with a first CORESET pool index, first downlink control information (DCI) that indicates a first transmission configuration indicator (TCI) state applicable from a first starting time associated with the first DCI;
receiving, in a second CORESET associated with a second CORESET pool index, second DCI that indicates a second TCI state applicable from a second starting time associated with the second DCI;
receiving third DCI that schedules a downlink communication; and
receiving the downlink communication according to the first TCI state or the second TCI state based at least in part on a time duration between the reception of the third DCI and the downlink communication.
15. The method of claim 14 , wherein receiving the downlink communication further comprises:
receiving the downlink communication according to the first TCI state based at least in part on the time duration satisfying a threshold.
16. The method of claim 14 , wherein the receiving the downlink communication further comprises:
receiving the downlink communication with a first beam associated with the first TCI state.
17. The method of claim 14 , wherein the time duration fails to satisfy a threshold, wherein receiving the downlink communication comprises:
receiving the downlink communication according to the first TCI state based at least in part on the first CORESET pool index corresponding to a lowest CORESET pool index value among the first CORESET pool index and the second CORESET pool index.
18. The method of claim 14 , wherein the time duration fails to satisfy a threshold, wherein receiving the downlink communication comprises:
receiving the downlink communication according to the second TCI state based at least in part on the second CORESET pool index corresponding to a lowest CORESET pool index value among the first CORESET pool index and the second CORESET pool index.
19. The method of claim 14 , wherein receiving the third DCI comprises:
receiving the third DCI in the first CORESET.
20. 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, in a first control resource set (CORESET) associated with a first CORESET pool index, first downlink control information (DCI) that indicates a first transmission configuration indicator (TCI) state applicable from a first starting time associated with the first DCI;
receive, in a second CORESET associated with a second CORESET pool index, second DCI that indicates a second TCI state applicable from a second starting time associated with the second DCI;
receive third DCI that schedules a downlink communication; and
receive the downlink communication according to the first TCI state or the second TCI state based at least in part on a time duration between the reception of the third DCI and the downlink communication.