Patent ID: 9295019
Filing Date: 2016-03-22
CPC Classification: H04L,H04W

Claim Text:
1. A method of performing a D2D (device-to-device) communication in a wireless access system supportive of the D2D communication, comprising the steps of: receiving by a first user equipment a resource allocation information for the D2D communication with a second user equipment from a base station; transmitting by the first user equipment an initial signal for the D2D communication to the second user equipment through the allocated resource; scanning by the first user equipment a response signal transmitted from the second user equipment; and if the first user equipment receives the response signal from the second user equipment, performing the D2D communication with the second user equipment, wherein the initial signal comprises a first reference signal for matching synchronization between the first user equipment and the second user equipment and a second reference signal for a channel estimation between the first user equipment and the second user equipment.