Device-to-device data transmission method in wireless access system supporting device-to-device communication, and apparatus therefor

A device for performing device-to-device (D2D) communication in a wireless access system supporting D2D communication and cellular communication, the device comprising:

• a radio frequency (RF) unit for transmitting and receiving wireless signals;
• and
• a processor for performing D2D communication with a second device,
• wherein the processor:
• transmits first data to the second device through the RF unit using only a physical channel used for uplink (UL) transmission in the cellular communication;
• and
• receives second data from the second device through the RF unit using only the physical channel.

A device for performing device-to-device (D2D) communication in a wireless access system supporting D2D communication and cellular communication, the device comprising:

• a radio frequency (RF) unit for transmitting and receiving wireless signals;
• and
• a processor for performing D2D communication with a second device,
• wherein the processor:
• transmits first data to the second device through the RF unit using only a physical channel used for downlink (DL) transmission in the cellular communication;
• and
• receives second data from the second device through the RF unit using only the physical channel.