Method for performing a change of mode in devices directly communicating with each other in a wireless connection system, and apparatus for same

摘要

The present invention relates to a method for determining whether a mode change condition for performing a hand-over to a cellular network through which devices communicate with each other is satisfied, transmitting a mode change instruction message to a base station when the mode change condition is satisfied, receiving a mode change command message for starting a mode change from the base station, transmitting a first data packet index with respect to a data packet transmitted to a second device at a final stage through the communication between the devices to the base station, ending the communication with the second device when the inter-device communication end request message is received from the base station, and transmitting data to the second device through the cellular network.

主权项

1. A method of performing a mode change, which is performed by a first device performing a device-to-device communication in a wireless access system, the method comprising:
determining whether a mode change condition for performing a handover to a cellular network is satisfied while performing the device-to-device communication; transmitting a mode change indication message to a base station when the mode change condition is satisfied; receiving a mode change command message from the base station to initiate the mode change; transmitting a first data packet index for a data packet, which is lastly transmitted to a second device via the device-to-device communication, to the base station; when a device-to-device communication termination request message is received from the base station, terminating the device-to-device communication with the second device; and transmitting data to the second device via the cellular network, wherein the device-to-device communication termination request message includes a third data packet index for a data packet firstly transmitted via the cellular network by comparing the first data packet index and a second data packet index, and wherein the second data packet index indicates a data packet which is lastly received by the second device via the device-to-device communication.