Method and apparatus for monitoring physical downlink control channel

1. A method performed by a user equipment (UE) in a wireless communication system, the method comprising:

receiving configuration information for a power saving operation;

monitoring a power saving signal based on the configuration information; and

determining whether to monitor a physical downlink control channel (PDCCH) based on the power saving signal,

wherein the power saving signal is carried in a Downlink Control Information (DCI) monitored based on a Power Saving-Radio Network Temporary Identifier (PS-RNTI),

wherein the PS-RNTI is configured by radio resource control (RRC) signaling,

wherein determining of whether to monitor the PDCCH further comprises determining whether to start a DRX-on duration timer based on the power saving signal,

wherein the PDCCH is not monitored during a minimum time gap before starting of the DRX-on duration timer,

wherein the minimum time gap is determined based on a subcarrier spacing (SCS),

wherein the DCI is a UE specific DCI for the UE or a group specific DCI for plurality of UEs in which the UE is included,

wherein the group specific DCI comprises N power saving signaling fields, the N power saving signaling fields each of which position is determined by high layer signaling, and

wherein the N power saving signaling fields are indexed corresponding to each of the plurality of UEs.

2. The method of claim 1 , wherein the configuration information comprises at least one of:

information related to the power saving signal,

a time gap between a point of monitoring of the power saving signal and a point of monitoring of the PDCCH,

a size of the DCI, information related to bandwidth part (BWP) to be activated, or

information related to search space.

3. The method of claim 1 , wherein the power saving signal includes a wake up signal (WUS).

4. The method of claim 1 , wherein the power saving signal is monitored at a predetermined time gap before starting of the DRX-on duration timer.

5. A user equipment (UE) in a wireless communication system, the UE comprising:

a transceiver; and

at least one processor coupled with the transceiver and configured to:

receive configuration information for a power saving operation,

monitor a power saving signal based on the configuration information, and

determine whether to monitor a physical downlink control channel (PDCCH) based on the power saving signal,

wherein the power saving signal is carried in a Downlink Control Information (DCI) monitored based on a Power Saving-Radio Network Temporary Identifier (PS-RNTI),

wherein the PS-RNTI is configured by radio resource control (RRC) signaling,

wherein determining of whether to monitor the PDCCH further comprises determining whether to start a DRX-on duration timer based on the power saving signal,

wherein the PDCCH is not monitored during a minimum time gap before starting of the DRX-on duration timer,

wherein the minimum time gap is determined based on a subcarrier spacing (SCS),

wherein the DCI is a UE specific DCI for the UE or a group specific DCI for plurality of UEs in which the UE is included,

wherein the group specific DCI comprises N power saving signaling fields, the N power saving signaling fields each of which position is determined by high layer signaling, and

wherein the N power saving signaling fields are indexed corresponding to each of the plurality of UEs.

6. The UE of claim 5 , wherein the configuration information comprises at least one of:

information related to the power saving signal,

a time gap between a point of monitoring of the power saving signal and a point of monitoring of the PDCCH,

a size of the DCI, information related to bandwidth part (BWP) to be activated, or

information related to search space.

7. The UE of claim 6 , wherein the power saving signal includes a wake up signal (WUS).

8. The UE of claim 5 , wherein the power saving signal is monitored at a predetermined time gap before starting of the DRX-on duration timer.