Social-aware Jamming Allocation for Physical-layer Security in D2D Multicast Network

Device-to-Device (D2D) communications have been a promising technology to meet the rapidly growing demand of mobile data traffic in 5G cellular network. In this paper, we consider physical layer security (PLS) in D2D communication underlay to cellular network with multiple friendly jammers. Different from the existing physical layer security for mobile networks only consider the physical domain conditions but neglect social domain factors which results in ineffective communication links between users unwilling to share content, we first leverage the joint the knowledge of social domain and physical domain to format the D2D multicast clusters and jammers in heterogeneous networks. Then we study the jammer allocation problem to maximize the overall increase of secrecy capacity for D2D clusters by optimal jamming power control and jamming matching. Specifically, we obtain optimal jamming power for each D2D pair and formulate the D2D pairs and jammers matching problem in the weighted bipartite graph and introduce the Kuhn-Munkres (KM) algorithm and Hungarian Matching (HM) algorithm to provide the final solution. Simulation results demonstrate that our scheme could efficiently improve the secrecy capacity for D2D multicast communication.