Abstract
Due to high mobility and flexibility, unmanned aerial vehicles (UAVs) have attracted significant attention from both academia and industry in wireless communications. Different types of UAVs are used for different wireless applications. However, there is a dilemma that no suitable approach is available to provide continuous available long-time wireless coverage from UAV-mounted base stations (UBSs) since rotary-wing UAVs require frequent energy replenishment while fixed-wing UAVs cannot hover at fixed locations. In this paper, the fixed-wing UBS is considered for providing continuous available wireless services to ground users with a novel dynamic resource allocation framework. In particular, the optimal resource allocations for both out-band and in-band wireless backhaul schemes are derived using convex optimization theory. Moreover, the sequential convex optimization method is used to obtain the energy-efficient trajectories. Finally, extensive simulation results are provided to verify the effectiveness of our proposed method. A comparison of out-band and in-band backhaul schemes is also provided.
Highlights
Unmanned aerial vehicles (UAVs) have attracted increasing attention in many areas
Compared to terrestrial communication systems, the high altitude of UAV-mounted base stations (UBSs) usually leads to a high probability of line-of-sight (LoS) links, which results in high-quality air-to-ground channels
It is assumed that the coordinate of the ground base station (GBS) is (0, 0)
Summary
Unmanned aerial vehicles (UAVs) have attracted increasing attention in many areas. UAV-mounted base stations (UBSs) have emerged as a promising solution to provide wireless services to ground users [1], [2]. Compared to terrestrial communication systems, the high altitude of UBSs usually leads to a high probability of line-of-sight (LoS) links, which results in high-quality air-to-ground channels. The UBSs are flexible that they can be reassigned and relocated [3]. The applications of UBSs are usually determined by the characteristics of different types of UAVs [4]. The rotary-wing UAVs are equipped with propellers, which help them to hover at fixed locations. The rotarywing UBSs can provide continuous available wireless services and assist the cellular communication system in the
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