Methods and apparatuses of determining quasi co-location (QCL) assumptions for beam operations

1. A user equipment (UE) comprising:

one or more non-transitory computer-readable media having computer-executable instructions embodied thereon; and

at least one processor coupled to the one or more non-transitory computer-readable media, and configured to execute the computer-executable instructions to:

monitor at least one of a plurality of Control Resource Sets (CORESETs) configured for the UE within an active Bandwidth Part (BWP) of a serving cell in a time slot; and

apply a first Quasi Co-Location (QCL) assumption of a first CORESET of a set of one or more monitored CORESETs to receive an aperiodic Channel Status Information-Reference Signal (CSI-RS),

wherein the first CORESET is associated with a monitored search space configured with a lowest CORESET Identity (ID) among the set of one or more monitored CORESETs.

2. The UE of claim 1 , wherein the at least one processor is further configured to execute the computer-executable instructions to:

obtain, from the first CORESET, Downlink Control Information (DCI) scheduling the aperiodic CSI-RS, wherein a scheduling offset between an end of a last symbol of a Physical Downlink Control Channel (PDCCH) carrying the DCI and a beginning of a first symbol of a resource carrying the aperiodic CSI-RS is less than a threshold.

3. The UE of claim 1 , wherein the first CORESET overlaps a second CORESET of the plurality of CORESETs in at least one symbol in a time domain, the second CORESET is a non-monitored CORESET in the plurality of CORESETs, and the non-monitored CORESET is associated with a non-monitored search space configured to the UE.

4. The UE of claim 3 , wherein the monitored search space associated with the first CORESET is configured with a first search space ID, the non-monitored search space associated with the second CORESET is configured with a second search space ID, and the first search space ID is lower than the second search space ID.

5. The UE of claim 3 , wherein the second CORESET is configured on one of:

a deactivated Bandwidth Part (BWP); and

a deactivated Secondary Cell (SCell).

6. The UE of claim 3 , wherein the second CORESET further overlaps a third CORESET of the set of one or more monitored CORESETs in at least one symbol in the time domain.

7. The UE of claim 1 , wherein the plurality of CORESETs and a resource carrying the aperiodic CSI-RS are provided in the time slot and the active BWP of the serving cell.

8. The UE of claim 1 , wherein the at least one processor is further configured to execute the computer-executable instructions to:

obtain Downlink Control Information (DCI) scheduling a Physical Downlink Shared Channel (PDSCH) from the first CORESET; and

apply a second QCL assumption of a second CORESET to receive the PDSCH when a scheduling offset between an end of a last symbol of a PDCCH carrying the DCI and a beginning of a first symbol of the PDSCH is less than a threshold,

wherein the second CORESET overlaps the PDSCH in at least one symbol in a time domain.

9. The UE of claim 8 , wherein the second CORESET is a non-monitored CORESET in the plurality of CORESETs, and the non-monitored CORESET is associated with a non-monitored search space configured to the UE.

10. A user equipment (UE) comprising:

one or more non-transitory computer-readable media having computer-executable instructions embodied thereon; and

at least one processor coupled to the one or more non-transitory computer-readable media, and configured to execute the computer-executable instructions to:

monitor at least one of a plurality of Control Resource Sets (CORESETs) configured for the UE within an active Bandwidth Part (BWP) of a serving cell in a time slot;

receive Downlink Control Information (DCI) scheduling a Physical Downlink Shared Channel (PDSCH) from a Physical Downlink Control Channel (PDCCH); and

apply a Quasi Co-Location (QCL) assumption for reception of the PDCCH to receive the PDSCH, when a scheduling offset between an end of a last symbol of the PDCCH carrying the DCI and a beginning of a first symbol of the PDSCH is less than a threshold,

wherein the PDCCH is transmitted in one of a set of one or more monitored CORESETs, and the one of the set of one or more monitored CORESETs is associated with a monitored search space configured with a lowest CORESET Identity (ID) among the set of one or more monitored CORESETs.

11. A method of wireless communications, the method comprising:

monitoring, by a user equipment (UE), at least one of a plurality of Control Resource Sets (CORESETs) configured for the UE within an active Bandwidth Part (BWP) of a serving cell in a time slot; and

applying, by the UE, a first Quasi Co-Location (QCL) assumption of a first CORESET of a set of one or more monitored CORESETs to receive an aperiodic Channel Status Information-Reference Signal (CSI-RS),

wherein the first CORESET is associated with a monitored search space configured with a lowest CORESET Identity (ID) among a set of one or more monitored CORESETs.

12. The method of claim 11 , further comprising:

obtaining, by the UE, Downlink Control Information (DCI) scheduling the aperiodic CSI-RS from the first CORESET, wherein a scheduling offset between an end of a last symbol of a Physical Downlink Control Channel (PDCCH) carrying the DCI and a beginning of a first symbol of a resource carrying the aperiodic CSI-RS is less than a threshold.

13. The method of claim 11 , wherein the first CORESET overlaps a second CORESET of the plurality of CORESETs in at least one symbol in a time domain, the second CORESET is a non-monitored CORESET in the plurality of CORESETs, and the non-monitored CORESET is associated with a non-monitored search space configured to the UE.

14. The method of claim 13 , wherein the monitored search space associated with the first CORESET is configured with a first search space ID, the non-monitored search space associated with the second CORESET is configured with a second search space ID, and the first search space ID is lower than the second search space ID.

15. The method of claim 13 , wherein the second CORESET is configured on one of:

a deactivated Bandwidth Part (BWP); and

a deactivated Secondary Cell (SCell).

16. The method of claim 13 , wherein the second CORESET further overlaps a third CORESET of the set of one or more monitored CORESETs in at least one symbol in the time domain.

17. The method of claim 11 , wherein the plurality of CORESETs and a resource carrying the aperiodic CSI-RS are provided in the time slot and the active BWP of the serving cell.

18. The method of claim 11 , further comprising:

obtaining, by the UE, Downlink Control Information (DCI) scheduling a Physical Downlink Shared Channel (PDSCH) from the first CORESET; and

applying, by the UE, a second QCL assumption of a second CORESET to receive the PDSCH when a scheduling offset between an end of a last symbol of a PDCCH carrying the DCI and a beginning of a first symbol of the PDSCH is less than a threshold,

wherein the second CORESET overlaps the PDSCH in at least one symbol in a time domain.

19. The method of claim 18 , wherein the second CORESET is a non-monitored CORESET in the plurality of CORESETs, and the non-monitored CORESET is associated with a non-monitored search space configured to the UE.