Method and apparatus for monitoring physical downlink control channel
Embodiments of the disclosure provides a method and an apparatus for power saving operation in a wireless communication system, wherein the method comprises: receiving configuration information for the power saving operation; monitoring a power saving signal based on the configuration information; and determining whether to monitor a PDCCH based on the power saving signal.
1. A method performed by a user equipment (UE) in a wireless communication system, the method comprising:
receiving downlink control information (DCI) scheduling a physical uplink shared channel (PUSCH) or a physical downlink shared channel (PDSCH), the DCI including a physical downlink control channel (PDCCH) monitoring field of 1 bit or 2 bits; and
determining whether to skip PDCCH monitoring based on a value of the PDCCH monitoring field,
wherein a ‘0’ value for the 1 bit of the PDCCH monitoring field indicates no skipping in the PDCCH monitoring, and a ‘1’ value for the 1 bit of the PDCCH monitoring field indicates skipping the PDCCH monitoring within a time window, and
wherein a ‘00’ value for the 2 bits indicates no skipping in the PDCCH monitoring, each of a ‘01’ value, a ‘10’ value, and a ‘11’ value indicates skipping the PDCCH monitoring for different lengths of time windows.
2. The method of claim 1 , further comprising:
receiving configuration information for a power saving operation;
monitoring a power saving signal based on the configuration information; and
determining whether to start a discontinuous reception (drx)-on duration timer based on the power saving signal,
wherein the power saving signal is not monitored during a minimum time gap before the starting of the drx-on duration timer, and
wherein the minimum time gap is determined based on UE capability information or subcarrier spacing (SCS).
3. The method of claim 2 ,
wherein the power saving signal is carried in DCI monitored based on a Power Saving-Radio Network Temporary Identifier (PS-RNTI), and
wherein the PS-RNTI is configured by radio resource control (RRC) signaling.
4. The method of claim 3 ,
wherein the DCI monitored based on the PS-RNTI is UE specific DCI for the UE or group specific DCI for a plurality of UEs in which the UE is included.
5. The method of claim 4 ,
wherein the group specific DCI comprises N power saving signaling fields, and a position of a power saving signaling field for the UE is determined by high layer signaling.
6. The method of claim 5 ,
wherein the N power saving signaling fields are indexed such as to respectively correspond to the plurality of UEs.
7. The method of claim 2 ,
wherein the configuration information comprises at least one of information related to the power saving signal, a time gap between a point of monitoring the power saving signal and a point of monitoring the PDCCH, a size of the DCI, information related to bandwidth part (BWP) to be activated, or information related to search space.
8. The method of claim 2 ,
wherein the power saving signal includes a wake up signal.
9. 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 downlink control information (DCI) scheduling a physical uplink shared channel (PUSCH) or a physical downlink shared channel (PDSCH), the DCI including a physical downlink control channel (PDCCH) monitoring field of 1 bit or 2 bits; and
determine whether to skip PDCCH monitoring based on a value of the PDCCH monitoring field,
wherein a ‘0’ value for the 1 bit of the PDCCH monitoring field indicates no skipping in the PDCCH monitoring, and a ‘1’ value for the 1 bit of the PDCCH monitoring field indicates skipping the PDCCH monitoring within a time window, and
wherein a ‘00’ value for the 2 bits indicates no skipping in the PDCCH monitoring, each of a ‘01’ value, a ‘10’ value, and a ‘11’ value indicates skipping the PDCCH monitoring for different lengths of time windows.
10. The UE of claim 9 ,
wherein the at least one processor is further configured to:
receive configuration information for a power saving operation;
monitor a power saving signal based on the configuration information; and
determine whether to start a discontinuous reception (drx)-on duration timer based on the power saving signal,
wherein the power saving signal is not monitored during a minimum time gap before the starting of the drx-on duration timer, and
wherein the minimum time gap is determined based on UE capability information or subcarrier spacing (SCS).
11. The UE of claim 10 ,
wherein the power saving signal is carried in DCI monitored based on a Power Saving-Radio Network Temporary Identifier (PS-RNTI), and
wherein the PS-RNTI is configured by radio resource control (RRC) signaling.
12. The UE of claim 11 ,
wherein the DCI monitored based on the PS-RNTI is UE specific DCI for the UE or group specific DCI for a plurality of UEs in which the UE is included.
13. The UE of claim 12 ,
wherein the group specific DCI comprises N power saving signaling fields, and a position of a power saving signaling field for the UE is determined by high layer signaling.
14. The method of claim 13 ,
wherein the N power saving signaling fields are indexed such as to respectively correspond to the plurality of UEs.
15. The UE of claim 10 ,
wherein the configuration information comprises at least one of information related to the power saving signal, a time gap between a point of monitoring the power saving signal and a point of monitoring the PDCCH, a size of the DCI, information related to bandwidth part (BWP) to be activated, or information related to search space.
16. The UE of claim 10 ,
wherein the power saving signal includes a wake up signal.