Methods and related devices for performing cross-carrier scheduling with beam operations

1. A method for wireless communications, the method comprising:

receiving, by a User Equipment (UE), a first Physical Downlink Control Channel (PDCCH) on a first cell, the first PDCCH comprising first scheduling information of a first Physical Downlink Shared Channel (PDSCH) of a second cell cross-carrier scheduled by the first cell;

receiving, by the UE, a Control Resource Set (CORESET) configuration from a base station via Radio Resource Control (RRC) signaling, the CORESET configuration being associated with a search space set for cross-carrier scheduling the second cell, the CORESET configuration comprising more than one Transmission Configuration Indicator (TCI) state configured for the second cell; and

receiving, by the UE, the first PDSCH on the second cell only when a first time offset between the first PDCCH and the first PDSCH is larger than or equal to a predefined threshold.

2. The method of claim 1 , wherein the CORESET configuration further comprises

an indicator to indicate a TCI-state field being present in Downlink Control Information (DCI).

3. The method of claim 1 , wherein the first scheduling information is contained in DCI.

4. The method of claim 1 , further comprising:

receiving, by the UE, a second PDCCH on the first cell, the second PDCCH comprising second scheduling information of a second PDSCH; and

prioritizing, by the UE, the reception of the first PDCCH, when the first PDCCH overlaps with the second PDSCH in at least one symbol, and a second time offset between the second PDCCH and the second PDSCH is less than the predefined threshold.

5. The method of claim 4 , wherein the second scheduling information is contained in DCI.

6. The method of claim 1 , further comprising:

receiving, by the UE, a Beam Failure Recovery configuration comprising a search space identifier (ID) of a search space configuration associated with a CORESET configured on a specific cell other than the second cell.

7. The method of claim 6 , wherein the specific cell is the first cell.

8. The method of claim 6 , wherein the search space configuration comprises at least one of:

a number of Physical Resource Blocks (PRBs);

a number of symbols; and

a Control Channel Element (CCE) to Resource Element Group (REG) mapping.

9. A User Equipment (UE) comprising:

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

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

receive a first Physical Downlink Control Channel (PDCCH) on a first cell, the first PDCCH comprising first scheduling information of a first Physical Downlink Shared Channel (PDSCH) of a second cell cross-carrier scheduled by the first cell;

receive a Control Resource Set (CORESET) configuration from a base station via Radio Resource Control (RRC) signaling, the CORESET configuration being associated with a search space set for cross-carrier scheduling the second cell, the CORESET configuration comprising more than one Transmission Configuration Indicator (TCI) state configured for the second cell; and

receive the first PDSCH on the second cell only when a first time offset between the first PDCCH and the first PDSCH is larger than or equal to a predefined threshold.

10. The UE of claim 9 , wherein the CORESET configuration further comprises

an indicator to indicate a TCI-state field being present in Downlink Control Information (DCI).

11. The UE of claim 9 , wherein the first scheduling information is contained in DCI.

12. The UE of claim 9 , wherein the at least one processor is further configured to execute the computer-executable instructions to:

receive a second PDCCH on the first cell, the second PDCCH comprising second scheduling information of a second PDSCH; and

prioritize the reception of the first PDCCH, when the first PDCCH overlaps with the second PDSCH in at least one symbol, and a second time offset between the second PDCCH and the second PDSCH is less than the predefined threshold.

13. The UE of claim 12 , wherein the second scheduling information is contained in DCI.

14. The UE of claim 9 , wherein the at least one processor is further configured to execute the computer-executable instructions to:

receive a Beam Failure Recovery configuration comprising a search space identifier (ID) of a search space configuration associated with a CORESET configured on a specific cell other than the second cell.

15. The UE of claim 14 , wherein the specific cell is the first cell.

16. The UE of claim 14 , wherein the search space configuration comprises at least one of:

a number of Physical Resource Blocks (PRBs);

a number of symbols; and

a Control Channel Element (CCE) to Resource Element Group (REG) mapping.