Method for performing PDCCH monitoring by terminal in wireless communication system, and terminal using same method
The present specification relates to a method for monitoring a physical downlink control channel (PDCCH) performed by a terminal in a wireless communication system, in which a discontinuous reception (DRX) inactivity timer is started and a PDCCH is monitored while the DRX inactivity timer is in operation, wherein the terminal performs a power saving operation on the basis of receiving a go to sleep signal (GTS) while the DRX inactivity timer is in operation.
1. A method for monitoring a physical downlink control channel (PDCCH) in a wireless communication system, the method performed by a user equipment (UE) and comprising:
receiving an operation indication signal informing one of a first operation and a second operation to be applied when the UE receives go to sleep signal (GTS);
starting a discontinuous reception (DRX) inactivity timer; and
monitoring the PDCCH while the DRX inactivity timer is running,
wherein based on receiving the GTS while the DRX inactivity timer is running:
i) based on the operation indication signal informing the first operation, the UE continues to operate the DRX inactivity timer, starts a GTS timer, and performs a sleep operation during running of the GTS timer, and
ii) based on the operation indication signal informing the second operation, the UE stops the DRX inactivity timer, starts a GTS timer, and performs a monitoring of a wake-up signal (WUS) during running of the GTS timer.
2. The method of claim 1 , wherein the UE transitions to a sleep state based on failure to receive the PDCCH while a DRX on duration timer is running.
3. The method of claim 1 , wherein the UE restarts the DRX inactivity timer based on receiving the PDCCH while a DRX on duration timer is running, and
wherein the UE monitors another PDCCH while the DRX inactivity timer is running.
4. The method of claim 1 , wherein a duration of a DRX on duration timer is shorter than a duration of the DRX inactivity timer.
5. The method of claim 1 , wherein the UE receives information on a value of the DRX inactivity timer from a base station.
6. The method of claim 1 , wherein the DRX inactivity timer starts when the UE receives the PDCCH during an on-duration.
7. A user equipment (UE) comprising:
at least one transceiver for transmitting and receiving radio signals; and
at least one processor that operates in conjunction with the at least one transceiver, wherein the at least one processor is adapted to:
receive an operation indication signal informing one of a first operation and a second operation to be applied when the UE receives go to sleep signal (GTS);
start a discontinuous reception (DRX) inactivity timer; and
monitor a physical downlink control channel (PDCCH) while the DRX inactivity timer is running,
wherein based on receiving the GTS while the DRX inactivity timer is running:
i) based on the operation indication signal informing the first operation, the UE continues to operate the DRX inactivity timer, starts a GTS timer, and performs a sleep operation during running of the GTS timer, and
ii) based on the operation indication signal informing the second operation, the UE stops the DRX inactivity timer, starts a GTS timer, and performs a monitoring of a wake-up signal (WUS) during running of the GTS timer.
8. The UE of claim 7 , the UE communicates with at least one of a mobile terminal, a network, and an autonomous vehicle other than the UE.