Proximity Mode Selection Method in Device to Device Communications

Growing smart phones population and multimedia traffic in cellular networks have caused traffic congestion in base stations (BS) and increasing delay in responding users requests. Device-to-Device communication, shortly D2D, is a new feature of the emerging cellular network generation which can alleviate the traffic congestion in BS. One of the challenges of D2D is mode selection, i.e., deciding upon establishing a conventional cellular communication via BS or a direct D2D. In this paper, a mode selection method is proposed based on the use of the probability of users' proximity. Those users are nominated for D2D whose distance to their destination is higher than a range which creates proximity probability close to one. Moreover, the nominated one should not cause interference on other ongoing communications performing via BS or as D2D. The simulation of the proposed method in a cellular network shows that the required transmission power as well as the transmission latency decreases compared to the ones of a conventional cellular network where all calls are performed via the BS. In fact, the power and the delay reduction are caused by path loss deduction and frequency reusing gain, respectively, in D2D.