Social-Aware Based Secure Relay Selection in Relay-Assisted D2D Communications

Abstract

Relay-assisted transmission could effectively enhance the performance of Device-to-Device (D2D) communications when D2D user equipments (UEs) are too far away from each other or the quality of D2D channel is not good enough for direct communications. Meanwhile, security is one of the major concerns for proximity services. The secure relay selection problem for D2D communications underlaying cellular network is studied in this paper. Firstly, we define a relay selection area and derive the closed-form of outage probability in D2D links using a Poisson Point Process (PPP) method. Next, in the defined relay selection area, we propose a secure relay selection scheme for the relay-assisted D2D communication system by exploiting the social relation as a security factor. Simulation results show that the scheme based on social relation can greatly improve the security performance of relay-assisted D2D communications.

A novel multiple access diamond channel model

“…Therefore, a relay selection technique may be exploited to choose the best two relays. 7,[25][26][27] For example, the authors in previous studies 25,26 studied the selection of the best two relays such that the bit error is minimized. In our case, two relays may be selected from many so that we maximize the achievable rate region.…”

“…The proof may be attained by following the transmission in the two phases, as shown before. Specifically, the subrates R 11 , R 12 , R 21 , R 22 , and the sum rate R 1 + R 2 are shown in (7) and (12).…”

“…However, this selection may not be optimum. Therefore, a relay selection technique may be exploited to choose the best two relays 7,25‐27 . For example, the authors in previous studies 25,26 studied the selection of the best two relays such that the bit error is minimized.…”

“…In another multiuser communication network, the basic model of the relay channel consists of a source, a destination, and an intermediate device, that is, the relay. [5][6][7][8][9] The relay either significantly improves the source's signal at its destination or extends the source's signal into its receiver, as in the case of no direct link between the source and the destination. In forwarding the source's signal into its destination, the relay may employ decode-and-forward (DF), amplify-and-forward, or compressand-forward.…”

“…For example, Abu Al Haija and Vu 1 and Al‐qudah and Bataineh 2 investigated the effect of cooperation between the two users on the achievable rate region. In another multiuser communication network, the basic model of the relay channel consists of a source, a destination, and an intermediate device, that is, the relay 5‐9 . The relay either significantly improves the source's signal at its destination or extends the source's signal into its receiver, as in the case of no direct link between the source and the destination.…”