Power allocation for improving physical layer security in D2D communication via stackelberg game

Abstract

In this paper, we aim to improve the physical layer security for Device-to-device (D2D) communication underlaying cellular networks by allocating interference power elegantly, and the security issues of both cellular users and D2D pairs are taken into consideration simultaneously. First of all, the two-level sequential Stackelberg game is introduced to solve the above problem via power allocation, which can better describe the asymmetric competition between cellular users and D2D pairs. Moreover, the secrecy energy efficiency is defined as the utility function from the view of energy conservation. Then, an iterative power allocation algorithm is designed after the theoretical analysis. Finally, the simulation results show that both cellular users and D2D pairs have the security performance improved.