Security-Enhanced Relay and Jammer Selection for Energy-Harvesting IoT Networks

Internet of Things (IoT), which can provide ubiquitous intelligence and pervasive interconnections to a variety of devices, is becoming a vital component of building the intelligent world. In this work we propose a new relay and jammer selection method to improve physical layer security (PLS) and energy efficiency for the IoT network with energy harvesting (EH) devices. In this method, the intermediate nodes are allowed to use time switching (TS) protocol to harvest energy from power transfer stations (PTS). By taking the channel gain between the PTSs and the intermediate nodes into consideration, two intermediate nodes are selected as relay and jammer respectively to transmit confidential and jamming signals to the destination and eavesdropper aiming at minimizing the secrecy outage probability (SOP). We further analyze the secrecy outage of the system and derive the closed-form expression of SOP. Simulation results demonstrate the performance gain of the proposed method.