Patent ID: 9185733
Filing Date: 2015-11-10
Classification: H04W

Abstract:
1. A data transmission/reception method of a first device for device-to-device (D2D) communication, comprising: receiving activation reception assignment information of a first D2D link from a base station in a first subframe; transmitting whether the activation reception assignment information of the first D2D link has been successfully received to the base station in a second subframe after a predetermined number (m) of subframes from the first subframe; receiving data of the first D2D link from a second device based on the activation reception assignment information of the first D2D link in a third subframe after a predetermined number (n) of the subframes from the second subframe; and transmitting information indicating whether the data of the first D2D link has been successfully received to the second device in a fourth subframe after a first predetermined number (o) of the subframes from the third subframe, wherein it is determined whether the data received from the second device after a second predetermined number (p) of the subframes from the fourth subframe is initial transmission data or retransmission data based on the information indicating whether the data of the first D2D link has been successfully received.