LAUSR

In this paper, we investigate secure communication over cellular uplinks in device-to-device (D2D)-enabled cellular networks. We consider a more general scenario, in which multiple D2D pairs could simultaneously share the same resource block with a specific cellular user. First, an opportunistic access control scheme based on wireless channel gains is proposed, by which the candidate selected set of D2D pairs sharing the same resource block is determined. The proposed scheme could guarantee reliable communications for both cellular users and D2D pairs, and further could combat eavesdroppers while keeping the legitimate cellular user as non-intrusive as possible, regarding D2D pairs as friendly jammers in a non-collaborative way. Then, we derive theoretical results to characterize the security and reliability of the typical cellular and D2D links, respectively. To further support the performance of this hybrid network, we next present an interference threshold optimization model. Our aim is to minimize the connection outage probability (COP) of D2D pairs subject to the secrecy requirement of the cellular user. Finally, simulation results are presented to validate the effectiveness of our proposed scheme.