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In this paper, we develop a 6G wireless powered Internet of Things (IoT) system assisted by unmanned aerial vehicles (UAVs) to intelligently supply energy and collect data at the same time. In our dual-UAV scheme, UAV-E, with a constant power supply, transmits energy to charge the IoT devices on the ground, whereas UAV-B serves the IoT devices by data collection as a base station. In this framework, the system's energy efficiency is maximized, which we define as a ratio of the sum rate of IoT devices to the energy consumption of two UAVs during a fixed working duration. With the constraints of duration, transmit power, energy, and mobility, a difficult non-convex issue is presented by optimizing the trajectory, time duration allocation, and uplink transmit power of concurrently. To tackle the non-convex fractional optimization issue, we deconstruct it into three subproblems and we solve each of them iteratively using the descent method in conjunction with sequential convex approximation (SCA) approaches and the Dinkel-bach algorithm. The simulation findings indicate that the suggested cooperative design has the potential to greatly increase the energy efficiency of the 6G intelligent UAV-assisted wireless powered IoT system when compared to previous benchmark systems.
Miao et al. (Tue,) studied this question.
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