UAV-Aided Optimal Physical Layer Security in Integrated Satellite and Terrestrial Networks

We investigate the secrecy performance of integrated satellite and terrestrial networks (ISTNs) with the support of a drone (aka UAV). An optimisation problem is formulated to maximise the secrecy rate while guaranteeing the quality of service, including the minimum secrecy rate of the legitimate user, the minimum data rate of normal users, and power consumption. A nested-loop algorithm including outer and inner loops is proposed to convert the initial non-convex problem into multiple convex problems, which are solved by the Dinkelbach algorithm. Simulation results prove the efficiency of our methods in terms of secrecy rate compared to traditional benchmarks.