Time Allocation and Optimization in UAV-Enabled Wireless Powered Communication Networks

Unmanned aerial vehicles (UAVs) have attracted great research attention due to their flexibility. In this paper, the use of UAVs in wireless sensor networks as an energy transmitter and a data collector is investigated. The UAV first charged from charging station, such base station (BS), before it flies sensors for collection. Upon arrival, charges via power transfer (WPT) downlink, followed by transmission uplink. After that, back BS offload BS. We aim maximize amount offloaded allocating optimal time slots different tasks process, given fixed total time. maximization solved two steps convex optimization problems. step, allocation between WPT collection optimized. second charging, offloading Unlike previous works, our study takes into account process UAV, propulsion consumption at Both distance-dependent path loss small-scale fading are considered. Numerical results show that can without wasting any energy.