Method for Performing Communication Between Devices in a Wireless Access System, and Device for Same

1. A method for performing communication between devices in a wireless access system supporting device-to-device (D2D) communication, the method comprising: a first device transmitting indication information to a base station (BS), the indication information indicating whether the first device supports D2D communication; the first device receiving group information from the BS when the first device supports D2D communication, the group information related to grouping of devices that support D2D communication and received using mobility information and position information related to the devices; the first device selecting a second device that is attempting to perform D2D communication using the group information; and the first device performing D2D communication with the selected second device, wherein the group information is indicated by a D2D communication identifier represented as two hexadecimal symbols, the first hexadecimal symbol representing a D2D group identifier and the second hexadecimal symbol representing a D2D device identifier.

2. The method according to claim 1 , wherein the first device is configured to transmit the indication information during a network access process.

3. The method according to claim 1 , further comprising the first device transmitting the indication information before a mode change to an idle mode or a sleep mode.

4. The method according to claim 1 , further comprising the first device transmitting an Internet protocol (IP) address with the indication information, the IP address allocated to the first device.

5. The method according to claim 1 , further comprising: the first device transmitting a measurement signal to the second device, the measurement signal for measuring a channel state between the first device and the second device; the first device receiving channel state information from the second device, the channel state information obtained by measuring the channel state using the measurement signal; and the first device determining whether to perform D2D communication with the second device based on the received channel state information.

6. The method according to claim 5 , further comprising: the first device retransmitting the received measurement signal to the second device when the first device does not receive the channel state information from the second device within a predetermined time or receives a message from the second device requesting retransmission of the measurement signal.

7. The method according to claim 6 , further comprising: the first device reselecting, the second device using the received group information when the first device retransmits the received measurement signal at least predetermined number of times.

8. The method according to claim 6 , further comprising: the first device transmitting a message to the BS requesting update of the group information when the first device retransmits the received measurement signal at least a predetermined number of times.

9. A device for performing communication between devices in a wireless access system supporting device-to-device (D2D) communication, the device comprising: a radio frequency (RF) unit configured to transmit and receive a radio signal; and a processor configured to: control the RF unit to transmit indication information to a base station (BS), the indication information indicating whether the device supports D2D communication; control the RF unit to receive group information from the BS when the device supports D2D communication, the group information related to grouping of devices that support D2D communication and received using mobility information and position information related to the devices; select a other device that is attempting to perform D2D communication using the group information; and perform D2D communication with the selected another device, wherein the group information is indicated by a D2D communication identifier represented as two hexadecimal symbols, the first hexadecimal symbol representing a D2D group identifier and the second hexadecimal symbol representing a D2D device identifier.

10. The device according to claim 9 , wherein the processor is further configured to control the RF unit to transmit the indication information during a network access process.

11. The device according to claim 9 , wherein the processor is further configured to control the RF unit to transmit the indication information before a mode change to an idle mode or a sleep mode.

12. The device according to claim 9 , wherein the processor is further configured to control the RF unit to transmit an Internet protocol (IP) address with the indication information, the IP address allocated to the device.

13. The device according to claim 9 , wherein the processor is further configured to: control the RF unit to transmit a measurement signal to the another device, the measurement signal for measuring a channel state between the devices; control the RF unit to receive channel state information from the another device, the channel state information obtained by measuring the channel state using the measurement signal; and determine whether to perform D2D communication with the another device based on the received channel state information.

14. The device according to claim 13 , wherein the processor is further configured to control the RF unit to retransmit the received measurement signal to the another device when the channel state information is not received from the another device within a predetermined time or a message requesting retransmission of the measurement signal is received from the another device.

15. The device according to claim 14 , wherein the processor is further configured to reselect the another device using the received group information when the processor retransmits the measurement signal at least a predetermined number.

16. The device according to claim 14 , wherein the processor is further configured to transmit a message to the BS requesting update of the group information the processor retransmits the measurement signal at least a predetermined number.