Further, the resource region for the D2DSS transmission may include a D2DSS transmission frequency region and a guard region for the D2DSS transmission. Preferably, the D2D channel may contain scheduling assignment and data and when the resource region for the D2DCH transmission does not overlap with the D2DSS transmission frequency region but overlaps with the guard region, the data may be dropped only.

In another technical aspect of the present invention, provided herein is a method of receiving a D2D (device-to-device) signal of a first user equipment in a wireless communication system, including: performing D2D transmission scheduling for a D2DSS (device-to-device synchronization signal) and a D2DCH (device-to-device channel); and receiving D2D signals in a first D2D subframe and a second D2D subframe among a plurality of D2D subframes, wherein the first D2D subframe is a D2D subframe configured for transmission of a D2DSS of a second user equipment that belongs to an interference group with the first user equipment among D2D subframes configured to be available for D2DSS transmission, wherein the second D2D subframe is a D2D subframe configured for transmission of a D2DSS of a third user equipment that belongs to a non-interference group with the first user equipment among the D2D subframes configured to be available for the D2DSS transmission, and wherein when the D2DSS and the D2DCH are simultaneously scheduled, the D2DCH is dropped in the first D2D subframe from the D2D signal.

Additionally, the third user equipment may be located out of network coverage of the first user equipment.

Additionally, the second D2D subframe may be used in D2DCH transmission or D2DSS reception according to a predetermined probability in order to monitor the D2DSS.