Method and apparatus for resource allocation and operation in a wireless communication system supporting unicast and multicast/broadcast service

1 . A method performed by a user equipment (UE) in a wireless communication system supporting multicast and broadcast services (MBS), the method comprising:

receiving, from a base station, configuration information for configuring an MBS frequency resource within a downlink bandwidth part (BWP) via a radio resource control (RRC) signaling;

receiving, from the base station, downlink control information (DCI) based on a group-radio network temporary identifier (G-RNTI) on a physical downlink control channel (PDCCH), the DCI including time domain resource assignment (TDRA) for scheduling of a physical downlink shared channel (PDSCH) for multicast and frequency domain resource assignment (FDRA) for scheduling of the PDSCH for multicast, wherein the FDRA is based on the configuration information for configuring the MBS frequency resource; and

performing a BWP switching to a BWP indicated by a default downlink BWP-ID.

2 . The method of claim 1 , wherein the configuration information indicates a common frequency resource (CFR) associated with the downlink BWP, the MBS frequency resource including the CFR.

3 . The method of claim 2 , wherein the configuration information includes at least one of information on a size of the CFR and information on frequency domain location for the MBS.

4 . The method of claim 1 , further comprising:

identifying that a PDCCH, addressed to a G-RNTI, indicating downlink assignment is received on an active BWP; and

starting or restarting a BWP inactivity timer associated with the active BWP based on identifying that the PDCCH, addressed to the G-RNTI, indicating the downlink assignment is received on the active BWP,

wherein the BWP inactivity timer is configured for an activated serving cell of the UE.

5 . The method of claim 4 , wherein the performing of the BWP switching based on whether the default downlink BWP-ID is configured comprises:

identifying that the BWP inactivity timer associated with the active BWP expires and the default downlink BWP-ID is configured; and

performing the BWP switching to a BWP indicated by the default downlink BWP-ID based on identifying that the BWP inactivity timer associated with the active BWP expires and the default downlink BWP-ID is configured.

6 . The method of claim 4 , wherein the performing of the BWP switching based on whether the default downlink BWP-ID is configured comprises:

identifying that the BWP inactivity timer expires and the default downlink BWP-ID is not configured; and

performing the BWP switching to an initial downlink BWP based on identifying that the BWP inactivity timer expires and the default downlink BWP-ID is not configured.

7 . A user equipment (UE) in a wireless communication system supporting multicast and broadcast services (MBS), the UE comprising:

a transceiver; and

a processor configured to:

receive, via the transceiver from a base station, configuration information for configuring an MBS frequency resource within a downlink bandwidth part (BWP) via a radio resource control (RRC) signaling,

receive, via the transceiver from the base station, downlink control information (DCI) based on a group-radio network temporary identifier (G-RNTI) on a physical downlink control channel (PDCCH), the DCI including time domain resource assignment (TDRA) for scheduling of a physical downlink shared channel (PDSCH) for multicast and frequency domain resource assignment (FDRA) for scheduling of the PDSCH for multicast, wherein the FDRA is based on the configuration information for configuring the MBS frequency resource, and

perform a BWP switching to a BWP indicated by a default downlink BWP-ID.

8 . The UE of claim 7 , wherein the configuration information indicates a common frequency resource (CFR) associated with the downlink BWP, the MBS frequency resource including the CFR.

9 . The UE of claim 8 , wherein the configuration information includes at least one of information on a size of the CFR and information on frequency domain location for the MBS.

10 . The UE of claim 7 ,

wherein the processor is further configured to:

identify that a PDCCH, addressed to a G-RNTI, indicating downlink assignment is received on an active BWP, and

start or restart a BWP inactivity timer associated with the active BWP based on identifying that the PDCCH, addressed to the G-RNTI, indicating the downlink assignment is received on the active BWP, and

wherein the BWP inactivity timer is configured for an activated serving cell of the UE.

11 . The UE of claim 10 , wherein the processor is further configured to:

identify that the BWP inactivity timer associated with the active BWP expires and the default downlink BWP-ID is configured, and

perform the BWP switching to a BWP indicated by the default downlink BWP-ID based on identifying that the BWP inactivity timer associated with the active BWP expires and the default downlink BWP-ID is configured.

12 . The UE of claim 10 , wherein the processor is further configured to:

identify that the BWP inactivity timer expires and the default downlink BWP-ID is not configured, and

perform the BWP switching to an initial downlink BWP based on identifying that the BWP inactivity timer expires and the default downlink BWP-ID is not configured.

13 . A method performed by a base station in a wireless communication system supporting multicast and broadcast services (MBS), the method comprising:

transmitting, to a user equipment (UE), configuration information for configuring an MBS frequency resource within a downlink bandwidth part (BWP) via a radio resource control (RRC) signaling;

transmitting, to the UE, downlink control information (DCI) based on a group-radio network temporary identifier (G-RNTI) on a physical downlink control channel (PDCCH), the DCI including time domain resource assignment (TDRA) for scheduling of a physical downlink shared channel (PDSCH) for multicast and frequency domain resource assignment (FDRA) for scheduling of the PDSCH for multicast, wherein the FDRA is based on the configuration information for configuring the MBS frequency resource; and

determining whether to configure a default downlink BWP-ID associated with a BWP switching.

14 . The method of claim 13 , wherein the configuration information indicates a common frequency resource (CFR) associated with the downlink BWP, the MBS frequency resource including the CFR.

15 . The method of claim 14 , wherein the configuration information includes at least one of information on a size of the CFR and information on frequency domain location for the MBS.

16 . The method of claim 13 , further comprising:

configuring a BWP inactivity timer associated with an active BWP for an activated serving cell of the UE,

wherein a PDCCH, addressed to a G-RNTI, indicating downlink assignment is transmitted on the active BWP by the base station.

17 . A base station in a wireless communication system supporting multicast and broadcast services (MBS), the base station comprising:

a transceiver; and

a processor configured to:

transmit, to a user equipment (UE) via the transceiver, configuration information for configuring an MBS frequency resource within a downlink bandwidth part (BWP) via a radio resource control (RRC) signaling,

transmit, to the UE via the transceiver, downlink control information (DCI) based on a group-radio network temporary identifier (G-RNTI) on a physical downlink control channel (PDCCH), the DCI including time domain resource assignment (TDRA) for scheduling of a physical downlink shared channel (PDSCH) for multicast and frequency domain resource assignment (FDRA) for scheduling of the PDSCH for multicast, wherein the FDRA is based on the configuration information for configuring the MBS frequency resource, and

determine whether to configure a default downlink BWP-ID associated with a BWP switching.

18 . The base station of claim 17 , wherein the configuration information indicates a common frequency resource (CFR) associated with the downlink BWP, the MBS frequency resource including the CFR.

19 . The base station of claim 18 , wherein the configuration information includes at least one of information on a size of the CFR and information on frequency domain location for the MBS.

20 . The base station of claim 17 ,

wherein the processor is further configured to configure a BWP inactivity timer associated with an active BWP for an activated serving cell of the UE, and

wherein a PDCCH, addressed to a G-RNTI, indicating downlink assignment is transmitted on the active BWP by the base station.