A novel relay selection algorithm based on mobile social networks for device-to-device cooperative communications

Abstract

Relay selection is the key of Device-to-Device (D2D) cooperative communication. Aiming at the fact that current algorithms of relay selection lack the consideration of security, reliability and probing cost, simultaneously, a novel algorithm of relay selection based on social relationship and mobile location of users is presented. A D2D cooperative system model based on social networks is proposed, the sets of relay candidates are determined according to the mobile location of users, and the sets of candidates are narrowed by social relationship further. By adopting above mechanisms, the algorithm could reduce the probing costs and guarantee the security and reliability of relay nodes, thereby could enhance throughput of the system. Simulation results show that the proposed algorithm could significantly improve the throughput of D2D cooperative system, the performance not only is better than that of the system without relay but also is better than other schemes with and without social relationship under the same conditions.