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

1. A user equipment (UE) for performing beam operations, the 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 Downlink (DL) Reference Signal (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 DL RS is less than a threshold; and

apply a first Quasi Co-Location (QCL) assumption of a first CORESET of a set of one or more of the monitored at least one of a plurality of CORESETs to receive a DL 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 of the monitored at least one of the plurality of CORESETs.

2. The UE of claim 1 , wherein the first CORESET overlaps a non-monitored second CORESET of the plurality of CORESETs in a time domain, the non-monitored second CORESET associated with a non-monitored search space configured to the UE.

3. The UE of claim 2 , wherein:

the monitored search space is configured with a first search space ID,

the non-monitored search space is configured with a second search space ID, and

a value of the first search space ID is smaller than a value of the second search space ID.

4. The UE of claim 2 , wherein the second CORESET is configured on one of a deactivated BWP and a deactivated Secondary Cell (SCell).

5. The UE of claim 2 , wherein the second CORESET overlaps a third CORESET of the set of one or more of the monitored at least one of the plurality of CORESETs in the time domain.

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

7. 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, DCI scheduling a Physical Downlink Shared Channel (PDSCH); 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 a time domain.

8. The UE of claim 7 , wherein the second CORESET is a non-monitored CORESET in the plurality of CORESETs, the non-monitored CORESET associated with a non-monitored search space configured to the UE.

9. A method performed by a user equipment (UE) for beam operations, the method comprising:

monitoring 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;

obtaining Downlink Control Information (DCI) scheduling a Downlink (DL) Reference Signal (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 DL RS is less than a threshold; and

applying a first Quasi Co-Location (QCL) assumption of a first CORESET of a set of one or more of the monitored at least one of the plurality of CORESETs to receive a DL 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 of the monitored at least one of the plurality of CORESETs.

10. The method of claim 9 , wherein the first CORESET overlaps a non-monitored second CORESET of the plurality of CORESETs in a time domain, the non-monitored second CORESET associated with a non-monitored search space configured to the UE.

11. The method of claim 10 , wherein:

the monitored search space is configured with a first search space ID,

the non-monitored search space is configured with a second search space ID, and

a value of the first search space ID is smaller than a value of the second search space ID.

12. The method of claim 10 , wherein the second CORESET is configured on one of a deactivated BWP and a deactivated Secondary Cell (SCell).

13. The method of claim 10 , wherein the second CORESET overlaps a third CORESET of the set of CORESETs in the time domain.

14. The method of claim 9 , wherein the plurality of CORESETs and a resource carrying the DL RS are provided in the time slot and the active BWP of the serving cell.

15. The method of claim 9 , further comprising:

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

applying 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 time domain.

16. The method of claim 15 , wherein the second CORESET is a non-monitored CORESET in the plurality of CORESETs, the non-monitored CORESET associated with a non-monitored search space configured to the UE.