期刊
IET COMMUNICATIONS
卷 11, 期 8, 页码 1187-1194出版社
INST ENGINEERING TECHNOLOGY-IET
DOI: 10.1049/iet-com.2016.0808
关键词
cooperative communication; autonomous aerial vehicles; mobile robots; vehicular ad hoc networks; cellular radio; emergency management; unmanned aerial vehicles base station modelling; ground-to-air cooperative networks; road side units; wireless communications; physical damages; power outages; multiple UAV scenario; flying base stations; target connectivity threshold; vehicle density; geographical area; cellular networks; vehicular ad-hoc networks; VANET
After disasters, road side units, which can provide wireless communications to vehicles, may fail due to physical damages or power outages. Vehicle-to-vehicle communication also may not perform well owing to lack of neighbours in low vehicle density scenario or collisions in high vehicle density circumstance which may happen in disaster areas. In this study, the deployment of unmanned aerial vehicles (UAVs) as flying base stations to improve connectivity among vehicles in disaster affected areas is analysed. First, the connectivity among vehicles as a function of the altitude of the UAV is derived. Furthermore, multiple UAVs scenario is analysed to determine the minimum number of UAVs needed to guarantee a target connectivity threshold among vehicles for a given geographical area and vehicle density. Numerical and simulation results verify that there exist optimal UAV altitudes for different scenarios as shown in the authors' analyses, and the simulation results also verify that the number of UAVs must be larger than a certain value to guarantee a target connectivity threshold among vehicles.
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