QoS-Driven Subchannel and Power Allocation for Security-Aware D2D Underlaying Cellular Networks

In this paper, we propose a QoS-driven subchannel and power allocation scheme for security-aware D2D underlaying cellular networks. Specifically, we aim at maximizing the delay QoS constrained average sum throughput of D2D users while meeting cellular users' QoS requirements, D2D users' information security demands, as well as the subchannel and power allocation constraints. To solve our formulated integer-mixed nonconvex problem, we develop a two-step subchannel and power allocation scheme. In particular, by introducing power-splitting variables, the subchannel allocation and power allocation can be decoupled and independently optimized, where the subchannel allocation scheme is based on the classic water-falling algorithm and the power allocation problem is solved via the convex approximation method. Simulation results show that our proposed scheme outperforms the existing method.