In wireless sensor networks, utilizing the unmanned aerial vehicle (UAV) as a mobile data collector for the sensor nodes (SNs) is an energy-efficient technique to prolong the network lifetime. In this letter, considering a general fading channel model for the SN-UAV links, we jointly optimize the SNs' wakeup schedule and UAV's trajectory to minimize the maximum energy consumption of all SNs, while ensuring that the required amount of data is collected reliably from each SN. We formulate our design as a mixed-integer non-convex optimization problem. By applying the successive convex optimization technique, an efficient iterative algorithm is proposed to find a sub-optimal solution. Numerical results show that the proposed scheme achieves significant network energy saving as compared to benchmark schemes. Index Terms-Unmanned aerial vehicle, trajectory design, energy minimization, data collection, wireless sensor network.
Zhan et al. REF jointly optimized the sensor node's wakeup schedule and UAV's trajectory to minimize the maximum energy consumption of all sensor nodes while ensuring that a target amount of sensor data is collected reliably.
Energy-Efficient Data Collection in UAV Enabled Wireless Sensor Network