Discontinuous reception supporting method in wireless communication system supporting change of usage of radio resource and apparatus therefor

1. A method of monitoring a downlink control channel by a user equipment performing D2D (device-to-device) communication in a wireless communication system, the method comprising:

receiving information of a plurality of first subframes for counting a DRX (discontinuous reception) timer via a high layer signaling, wherein the first subframes are located so as not to overlap with second subframes for D2D signal transmission;

monitoring the downlink control channel at the plurality of first subframes; and

counting the DRX timer, when the monitoring the downlink control channel is performed on the plurality of first subframes.

2. The method of claim 1 , wherein one of the second subframes for the D2D signal transmission is determined by applying a timing advance (TA).

3. The method of claim 1 , wherein the DRX timer comprises one selected from the group consisting of an onDurationTimer, a drx-InactivityTimer and a drx-Retransmission Timer.

4. The method of claim 1 , wherein a DRX cycle interval is extended according to the number of second subframes.

5. The method of claim 1 , wherein the DRX timer comprises one selected from the group consisting of a drxShortCycleTimer, an HARQ round trip timer, an HARQ RTT timer, a mac-ContentionResolutionTimer, a shortDRX-Cycle, a longDRX-Cycle, and a drxStartOffset.

6. The method of claim 1 , wherein a stop operation of the DRX timer is determined according to a DRX command medium access control (MAC) control element, and

wherein the DRX command MAC control element is received in only the first subframes.

7. A user equipment for monitoring a downlink control channel and performing D2D (device-to-device) communication in a wireless communication system, the UE comprising:

a radio frequency unit; and

a processor coupled to the radio frequency unit to transceive a signal,

wherein the processor is configured to:

receive information of a plurality of first subframes for counting a DRX (discontinuous reception) timer via a high layer signaling, wherein the first subframes are located so as not to overlap with second subframes for D2D signal transmission,

monitor the downlink control channel at the plurality of first subframes, and

count the DRX timer, when the monitoring the downlink control channel is performed on the plurality of first subframes.