Patent ID: 9578651
Date: 2017-02-21
CPC Classifications: H04W

Claim:
1. A communication method of a device to device (D2D) user equipment (UE) in a cellular system supporting a communication frame structure including one or more subframes used for a D2D communication of the D2D UE, the method comprising: identifying an alarm region located within a first subframe, wherein the alarm region indicates whether a communication signal of another D2D UE having a priority is included in the first subframe or a second subframe related to the first subframe; and transmitting a communication signal of the UE through one of the second subframe and a third subframe related to the second subframe, wherein the first subframe and one of the second subframe or the third subframe, are used in the D2D communication of the UE, and wherein the identifying of the alarm region further comprises checking energy levels of entire alarm regions.