Method and device by which Device-to-Device user equipment transmits data in wireless communication system

A User Equipment (UE) operating as a transmitting UE (Tx UE) for transmitting Device-to-Device (D2D) data in a wireless communication system, the UE comprising:

• a transmitter, a receiver;
• and a processor, wherein the processor is configured to:
• control the receiver to receive a Radio Resource Control (RRC) information element related with a resource pattern for N subframes from a network node, wherein N is an integer number;
• determine a bitmap indicating M subframes used for the D2D data transmission within the N subframes, using the RRC information element related with the resource pattern for the N subframes, wherein M is an integer related with a number of transmission subframe and is equal to or less than N;
• control the transmitter to transmit a Scheduling Assignment (SA) including an index of the bitmap to a receiving UE (Rx UE);
• and control the transmitter to transmit the D2D data on the M subframes indicated by the bitmap to the Rx UE, wherein the RRC information element related with the resource pattern for the N subframes is used for limiting available values for the index of the bitmap for the M subframes, wherein the processor determines the bitmap satisfying the RRC information element related with the resource pattern, and wherein the index of the bitmap is used for one bitmap out of a set of bitmaps.