An Overview of Aerial Wireless Relay Networks for Emergency Communications during Large-Scale Disasters

Hiraku OKADA

IEICE TRANSACTIONS on Communications   Vol.E103-B    No.12    pp.1376-1384
Publication Date: 2020/12/01
Publicized: 2020/07/01
Online ISSN: 1745-1345
DOI: 10.1587/transcom.2020SEI0001
Type of Manuscript: Special Section INVITED PAPER (Special Section on IoT Sensor Networks and Mobile Intelligence)
aerial wireless relay networks,  multicopter UAV,  delay time,  flight schemes,  

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In emergency communication systems research, aerial wireless relay networks (AWRNs) using multicopter unmanned aerial vehicles (UAVs) have been proposed. The main issue of the AWRNs is how to minimize the delay time of packet transmissions since it is not easy to supply many multicopters to cover a wide area. In this paper, we review the flight schemes and their delay time for the AWRNs. Furthermore, the network has specific issues such as multicopters' drops due to their battery capacity depletion and inclination of moving multicopters. The inclination of multicopters affects the received power, and the communication range changes based on the inclination as well. Therefore, we clarify the effect of these issues on the delay time.