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Joint Uplink-and-Downlink Optimization of 3D UAV Swarm Deployment for Wireless-Powered IoT Networks

Authors
Ye, Han-TingKang, Xin.Joung, Jingon.Liang, Ying-Chang.
Issue Date
1-Sep-2021
Publisher
Institute of Electrical and Electronics Engineers Inc.
Keywords
Batteries; energy harvesting; IoT; Optimization; optimization.; Resource management; Sensors; Three-dimensional displays; Throughput; UAV; Unmanned aerial vehicles; wireless-powered communication networks
Citation
IEEE Internet of Things Journal, v.8, no.17, pp 13397 - 13413
Pages
17
Journal Title
IEEE Internet of Things Journal
Volume
8
Number
17
Start Page
13397
End Page
13413
URI
https://scholarworks.bwise.kr/cau/handle/2019.sw.cau/48477
DOI
10.1109/JIOT.2021.3065689
ISSN
2327-4662
Abstract
This paper investigates a full-duplex orthogonal-frequency-division multiple access (OFDMA) based multiple unmanned aerial vehicles (UAVs)-enabled wireless-powered Internet-of-Things (IoT) networks. In this paper, a swarm of UAVs is first deployed in three dimensions (3D) to simultaneously charge all devices, i.e., a downlink (DL) charging period, and then flies to new locations within this area to collect information from scheduled devices in several epochs via OFDMA due to potential limited number of channels available in IoT during an uplink (UL) communication period. To maximize the UL throughput of IoT devices, we jointly optimize the UL-and-DL 3D deployment of the UAV swarm, including the device-UAV association, the scheduling order, and the UL-DL time allocation. In particular, the DL energy harvesting threshold of devices and the UL signal decoding threshold of UAVs are taken into consideration when studying the problem. Besides, both line-of-sight and non-line-of-sight channel models are studied depending on the position of sensors and UAVs. The influence of potential limited number of channels in IoT is also considered. Guidelines on the 3D placement of UAVs in the DL charging and the UL communications are also given. Finally, simulation results show that the proposed optimal time allocation OFDMA-UAV scheme achieves significant throughput gains compared with conventional schemes. IEEE
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