Method and apparatus for data transmission of device-to-device user equipment in wireless communication system

An apparatus of a User Equipment (UE) for transmitting a Device-to-Device (D2D) data in a wireless communication system, the apparatus comprising:

• a transmission module;
• and
• a processor,
• wherein the processor is configured to determine a bitmap to be applied to a subframe pool for D2D data transmission by using a TRP (time resource pattern) according to an Uplink/Downlink (UL/DL) configuration which is included in one group among first UL/DL configuration group [1, 2, 4, 5], second UL/DL configuration group [0] and third UL/DL configuration group [3, 6], wherein a size of the TRP is configured differently according to each UL/DL configuration group, the UL/DL configuration configured by Radio Resource Control (RRC) signaling;
• to determine a set of subframes to transmit the D2D data by using the bitmap to the subframe pool for data transmission;
• and to transmit the D2D data in a subframe included in the determined subframe set.