Method and device for supporting sidelink discontinuous reception in wireless communication system
Provided is a method and apparatus for transmitting sidelink data by a first user equipment (UE) in a wireless communication system supporting sidelink communication between the first UE and a second UE. The method includes identifying configuration information including information associated with discontinuous reception (DRX) for the sidelink communication, and in case that the second UE performs a DRX operation, transmitting the sidelink data to the second UE in a DRX active time, the DRX active time of the second UE being identified based on the configuration information.
1. A method for transmitting sidelink data by a first user equipment (UE) in a wireless communication system supporting sidelink communication between the first UE and a second UE, the method comprising:
identifying configuration information including information associated with discontinuous reception (DRX) for the sidelink communication; and
in case that the second UE performs a DRX operation and there is no candidate resource in a DRX active time, additionally selecting, based on UE implementation, at least one resource to be used for transmitting the sidelink data to the second UE in the DRX active time, the DRX active time of the second UE being identified based on the configuration information.
2. The method of claim 1 ,
wherein identifying the configuration information comprises obtaining the configuration information through radio resource control (RRC) configuration using a PC5 interface for the sidelink communication between the first UE and the second UE.
3. The method of claim 1 ,
wherein the configuration information comprises information indicating whether the DRX for the sidelink communication is configured.
4. The method of claim 1 , further comprising:
determining a resource selection window based on the DRX active time of the second UE; and
selecting a resource for transmission of the sidelink data using the resource selection window.
5. The method of claim 1 ,
wherein a resource for transmission of the sidelink data is selected within the DRX active time of the second UE in case that the second UE performs a DRX operation and there is a candidate resource in the DRX active time.
6. The method of claim 1 , further comprising selecting a resource for transmission of the sidelink data by using a sensing scheme in which a UE directly selects a transmission resource for sidelink communication.
7. The method of claim 1 , wherein the information associated with the DRX includes at least one of:
information on a DRX cycle indicating a time period to which the DRX is applied,
information on a DRX-on duration timer indicating a time duration of the active time in the DRX cycle, and
information on a DRX-inactivity timer indicating an extended time duration of the active time when sidelink control information is detected before the DRX-on duration timer expires, and
wherein the active time corresponds to a time period in which the DRX-on duration timer or the DRX-inactivity timer operates.
8. A first user equipment (UE) for transmitting sidelink data in a wireless communication system supporting sidelink communication between the first UE and a second UE, the first UE comprising:
a transceiver; and
a processor configured to:
identify configuration information including information associated with discontinuous reception (DRX) for the sidelink communication, and
in case that the second UE performs a DRX operation and there is no candidate resource in a DRX active time, additionally select, based on UE implementation, at least one resource to be used for transmitting, via the transceiver, the sidelink data to the second UE in a DRX active time, the DRX active time of the second UE being identified based on the configuration information.
9. The first UE of claim 8 ,
wherein the processor is further configured to obtain the configuration information through radio resource control (RRC) configuration using a PC5 interface for the sidelink communication between the first UE and the second UE.
10. The first UE of claim 8 ,
wherein the configuration information comprises information indicating whether the DRX for the sidelink communication is configured.
11. The first UE of claim 8 ,
wherein the processor is further configured to determine a resource selection window based on the DRX active time of the second UE, and to select a resource for transmission of the sidelink data using the resource selection window.
12. The first UE of claim 8 ,
wherein a resource for transmission of the sidelink data is selected within the DRX active time of the second UE in case that the second UE performs a DRX operation and there is a candidate resource in the DRX active time.
13. The first UE of claim 8 ,
wherein the processor is further configured to select a resource for transmission of the sidelink data by using a sensing scheme in which a UE directly selects a transmission resource for sidelink communication.
14. The first UE of claim 8 , wherein the information associated with the DRX includes at least one of:
information on a DRX cycle indicating a time period to which the DRX is applied,
information on a DRX-on duration timer indicating a time duration of the active time in the DRX cycle, and
information on a DRX-inactivity timer indicating an extended time duration of the active time when sidelink control information is detected before the DRX-on duration timer expires, and
wherein the active time corresponds to a time period in which the DRX-on duration timer or the DRX-inactivity timer operates.