Secure transmissions of D2D underlay cellular networks with poisson cluster process

Recently, device-to-device (D2D) communication has emerged as a promising solution to meet rapidly growing demands for data services. This paper studies the physical layer security of D2D underlay cellular network, where the D2D and cellular communications coexist in the network, in the presence of randomly distributed eavesdroppers (Eves). We establish an analytical framework to assess the security performance of the network of interest. To be specific, by modeling the D2D underlay cellular network as a Poisson cluster process (PCP), we derive exact expressions for the coverage outage probabilities (COP) and secrecy outage probabilities (SOP), respectively, for both the cellular users (CU) and D2D users (DU). The numerical results are finally presented to verify our theoratical derivations and reveal some interesting insights into the effects of various parameters on the system performance.