Abstract
The Internet of things (IoT) has become a prominent platform which bridges diverse technologies in order to meet the ever-increasing application requirements of various industries. However, the IoT devices, especially in remote areas that lack infrastructures, are featured by the restricted energy and pose great challenges on network access and sustainable communication. In this paper, we investigate the unmanned aerial vehicle (UAV) aided wireless power transfer under a space-air-ground (SAG) network, where the UAV is exploited as an aerial relay to assist in uploading information generated by ground nodes (GNs), and mounted with energy transmitter to deliver wireless energy for GNs. The goal is to maximize the system sum rate while satisfying the proportional rate for GNs and the sustainability of the ground network. To this end, by adopting decode and forward (DF) and amplify and forward (AF) protocols, two sum rate maximization problems are formulated via jointly optimizing power control, time allocation as well as UAV trajectory. The resource allocation problems are both nonconvex, which are difficult to solve directly. To tackle them, two near-optimal iterative algorithms are proposed by leveraging the successive convex approximation technology and the alternating optimization method. Extensive simulations are provided to demonstrate the effectiveness of the proposed algorithms and evaluate the impacts of various parameters on DF and AF relays.
Highlights
W ITH the rapid development of sensing and wireless communication technologies, Internet of things (IoT), as a pivotal platform for information collection and exchange among physical devices, has been extended to various fields
IoT applications deployed in urban areas can make full use of advantages provided by mature terrestrial networks, such as high speed, ultra-reliability, and low latency [1]
We have studied the unmanned aerial vehicle (UAV) aided wireless power transmission (WPT) in the SAG network, where the UAV has been dispatched to charge the ground nodes (GNs) and assist the communication between the GNs and the satellite
Summary
W ITH the rapid development of sensing and wireless communication technologies, Internet of things (IoT), as a pivotal platform for information collection and exchange among physical devices, has been extended to various fields. IoT applications deployed in urban areas (e.g. smart cities, smart homes, etc.) can make full use of advantages provided by mature terrestrial networks, such as high speed, ultra-reliability, and low latency [1]. As for Internet of remote things (IoRT) located in geographies such as oceans, forests, and polar regions, the costs of deployment and maintenance of the terrestrial networks are very high, which imposes great challenges on providing cost-effective network access [2]–[4]. Battery recharging or manual battery replacement and envisioned as two feasible solution to prolong the battery life. It is inefficient and inconvenient for widely distributed IoRT devices
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