Method for device-to-device communication in wireless communication system and device therefor

A first user equipment (UE) for performing a Device-to-Device (D2D) communication in a wireless communication system, the first UE comprising:

• a radio frequency (RF) unit configured to transmit and receive wireless signals;
• and
• a processor configured to:
• control the RF unit to receive downlink (DL) control information from a base station (BS), the DL control information including resource allocation information for a D2D transmission;
• control the RF unit to transmit D2D control information on a Physical Sidelink Control Channel (PSCCH) to a second UE based on the resource allocation information;
• and
• control the RF unit to transmit D2D data on a Physical Sidelink Shared Channel (PSSCH) to the second UE based on the resource allocation information,
• wherein frequency hopping is performed between a PSCCH resource for a first transmission of the D2D control information and a PSCCH resource for a second transmission of the D2D control information,
• wherein the resource allocation information includes resource allocation information of only the PSCCH, and
• wherein a PSSCH resource for the transmission of the D2D data is derived from the resource allocation information of the only the PSCCH based on a transmission unit of the D2D control information and a transmission unit of the D2D data.