Time allocation optimization and trajectory design in UAV-assisted energy and spectrum harvesting network

Shi, Shuo, Li, Yuchen, Gu, Shushi, Huang, Tao, and Gu, Xuemai (2020) Time allocation optimization and trajectory design in UAV-assisted energy and spectrum harvesting network. IEEE Access. (In Press)

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Abstract

The scarcity of energy resources and spectrum resources has become an urgent problem with the exponential increase of communication devices. Meanwhile, unmanned aerial vehicle (UAV) is widely used to help communication network recently due to its maneuverability and flexibility. In this paper, we consider a UAV-assisted energy and spectrum harvesting (ESH) network to better solve the spectrum and energy scarcity problem, where nearby secondary users (SUs) harvest energy from the base station (BS) and perform data transmission to the BS, while remote SUs harvest energy from both BS and UAV but only transmit data to UAV to reduce the influence of near-far problem. We propose an unaligned time allocation scheme (UTAS) in which the uplink phase and downlink phase of nearby SUs and remote SUs are unaligned to achieve more flexible time schedule, including schemes (a) and (b) in remote SUs due to the half-duplex of energy harvesting circuit. In addition, maximum throughput optimization problems are formulated for nearby SUs and remote SUs respectively to find the optimal time allocation. The optimization problem can be divided into three cases according to the relationship between practical data volume and theoretical throughput to avoid the waste of time resource. The expressions of optimal energy harvesting time and data transmission time of each node are derived. Lastly, a successive convex approximation based iterative algorithm (SCAIA) is designed to get the optimal UAV trajectory in broadcast mode. Simulation results show that the proposed UTAS can achieve better performance than traditional time allocation schemes.

Item ID: 64299
Item Type: Article (Research - C1)
ISSN: 2169-3536
Keywords: Energy and spectrum harvesting network, UAV, resource allocation, trajectory design
Funders: National Natural Science Foundation of China (NNSF), Verification Platform of Multi-tier Coverage Communication Network for Oceans (VPMCCNO)
Projects and Grants: NNSF grant 61701136, VPMCCNO LZC0020
Date Deposited: 07 Sep 2020 19:45
FoR Codes: 10 TECHNOLOGY > 1005 Communications Technologies > 100510 Wireless Communications @ 100%
SEO Codes: 89 INFORMATION AND COMMUNICATION SERVICES > 8901 Communication Networks and Services > 890103 Mobile Data Networks and Services @ 100%
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