Power control and channel access for physical-layer security of D2D underlay communication

Device-to-device (D2D) communication is a promising technology for 5G wireless communication system. Since D2D communication usually reuses the resource of cellular users, interference management and resource allocation of D2D are the mainly research directions in D2D communication underlay cellular networks. The physical-layer security problem of D2D link is rarely under studied. In this paper, we develop the Stackelberg game frame to model D2D underlay communication in cellular networks. We analyze the equilibrium solution and optimize the power control and channel access of D2D link to maximize the achievable rate of cellular users and the physical-layer secrecy rate of D2D link. We propose a power control and channel access algorithm of D2D link then. Finally, we perform numerical simulations to study the performance of the proposed algorithm.