Method of deriving QCL assumption in multi-panel transmission and related device

1. A method of deriving a Quasi-CoLocation (QCL) assumption in multi-panel transmission for a user equipment (UE), the method comprising:

reporting, to a network, capabilities of supporting a multi-transmit-receive point (TRP) operation for supporting simultaneous reception from multiple TRPs and a panel-specific default beam for at least one physical downlink shared channel (PDSCH) reception;

obtaining a plurality of control resource set (CORESET) groups from the network of a wireless communication system;

determining a default QCL assumption for demodulation reference signal (DM-RS) port(s) of the at least one PDSCH reception scheduled by a scheduling physical downlink control channel (PDCCH) according to a CORESET of one of the plurality of CORESET groups, when a time offset between a reception of downlink control information (DCI) in the scheduling PDCCH and the at least one PDSCH reception is less than a threshold, wherein at least one of the plurality of CORESET groups includes at least one CORESET indicating the default QCL assumption; and

applying the default QCL assumption for reception of the DM-RS port(s) of the at least one PDSCH.

2. The method of claim 1 , wherein the default QCL assumption includes a QCL type-D parameter.

3. The method of claim 1 , wherein the at least one CORESET included in the at least one of the plurality of CORESET groups is associated with a same transmit-receive point (TRP).

4. The method of claim 1 , wherein the plurality of CORESET groups is configured by the network to the UE through radio resource control (RRC) signaling including a CORESET configuration indicating different values of a CORESETPoolIndex parameter.

5. The method of claim 1 , wherein the determining the default QCL assumption comprises:

determining that the default QCL assumption is associated with QCL parameter(s) utilized for PDCCH QCL indication of a CORESET indicated via a monitored search space with a lowest CORESET index of the one of the plurality of CORESET groups in a latest slot within an active bandwidth part (BWP) of a serving cell.

6. The method of claim 1 , wherein the threshold includes a timeDurationForQCL parameter.

7. The method of claim 1 , wherein the determining the default QCL assumption comprises:

determining a first default QCL assumption for a first DM-RS port(s) of a first PDSCH reception scheduled by a first PDCCH according to a first CORESET group of the plurality of CORESET groups; and

determining a second default QCL assumption for a second DM-RS port(s) of a second PDSCH reception scheduled by a second PDCCH according to a second CORESET group of the plurality of CORESET groups.

8. The method of claim 1 , wherein the reported capability includes information related to one of receiving transmission from multiple TRPs simultaneously according to frequency division multiplexing (FDM) or space division multiplexing (SDM), and allowing simultaneous PDSCH reception with corresponding physical resources being fully, partially or non-overlapped with each other.

9. The method of claim 1 , wherein the default QCL assumption is applied when radio resource control (RRC) signaling for enabling a panel-specific default beam and a multi-TRP operation is received from the network.

10. A user equipment (UE) for deriving Quasi-CoLocation (QCL) assumption in multi-panel transmission, the UE comprising:

a processor, for executing computer-executable instructions; and

a non-transitory machine-readable medium, coupled to the processor, for storing the computer-executable instructions, wherein the computer-executable instructions instruct the processor to:

report, to a network, capabilities of supporting a multi-transmit-receive point (TRP) operation for supporting simultaneous reception from multiple TRPs and a panel-specific default beam for at least one physical downlink shared channel (PDSCH) reception;

obtain a plurality of control resource set (CORESET) groups from the network of a wireless communication system;

determine a default QCL assumption for demodulation reference signal (DM-RS) port(s) of the at least one PDSCH reception scheduled by a scheduling physical downlink control channel (PDCCH) according to a CORESET of one of the plurality of CORESET groups when a time offset between a reception of downlink control information (DCI) in the scheduling PDCCH and the at least one PDSCH reception is less than a threshold, wherein at least one of the plurality of CORESET groups includes at least one CORESET indicating the default QCL assumption; and

apply the default QCL assumption for reception of the DM-RS port(s) of the at least one PDSCH.

11. The UE claim 10 , wherein the at least one CORESET included in the at least one of the plurality of CORESET groups is associated with a same transmit-receive point (TRP).

12. The UE of claim 10 , wherein the plurality of CORESET groups is configured by the network to the UE though radio resource control (RRC) signaling including a CORESET configuration indicating different values of a CORESETPoolIndex parameter.

13. The UE of claim 10 , wherein the determining the default QCL assumption comprises:

determining that the default QCL assumption is associated with QCL parameter(s) utilized for PDCCH QCL indication of a CORESET indicated via a monitored search space with a lowest CORESET index of one of the plurality of CORESET groups in a latest slot within an active bandwidth part (BWP) of a serving cell.

14. The UE of claim 10 , wherein the computer-executable instructions further instruct the processor to, when determining the default QCL assumption:

determine a first default QCL assumption for a first DM-RS port(s) of a first PDSCH reception scheduled by a first PDCCH according to a first CORESET group of the plurality of CORESET groups; and

determine a second default QCL assumption for a second DM-RS port(s) of a second PDSCH reception scheduled by a second PDCCH according to a second CORESET group of the plurality of CORESET groups.

15. The UE of claim 1 , wherein the reported capability includes information related to one of receiving transmission from multiple TRPs simultaneously according to frequency division multiplexing (FDM) or space division multiplexing (SDM), and allowing simultaneous PDSCH reception with corresponding physical resources being fully, partially or non-overlapped with each other.

16. The UE of claim 1 , wherein the computer-executable instructions further instruct the processor to:

apply the default QCL assumption when radio resource control (RRC) signaling for enabling a panel-specific default beam and multi-transmit-receive point (TRP) operation is received from the network.

17. The UE of claim 10 , wherein the default QCL assumption includes a QCL type-D parameter.

18. The UE of claim 10 , wherein the threshold includes a timeDurationForQCL parameter.