Patent ID: 9717094
Date: 2017-07-25
CPC Classifications: H04L,H04W

Claim:
1. A method, comprising: scheduling at least one resource for a Device-to-Device (D2D) transmission control channel (DCCH) carrying a D2D control information (D2DCI) message; transmitting, by a first UE, the DCCH on the at least one DCCH resource to at least one second UE; scheduling at least one resource for a D2D data channel (DDCH); transmitting, by the first UE, the DDCH on the at least one DDCH resource to the at least one second UE, wherein the DCCH is transmitted according to a time and frequency hopping pattern based on a hopping parameter; listening, by the first UE, on a configured set of potential resources for the DCCH to detect a transmission by another UE; in a case where the transmission by another UE is not detected, or a power of the transmission by another UE is below a given threshold, selecting, by the first UE, a subset of the set of potential DCCH resources as the at least one DCCH resource; and in a case where the transmission by another UE is detected, or the power of the transmission by another UE is above the given threshold, configuring a backoff timer indicating a number of time units or slots during which the first UE will not attempt to contend for the at least one DCCH resource.