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Optimal Deployment of Tethered Drones for Maximum Cellular Coverage in User Clusters

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posted on 2020-11-17, 16:40 authored by Osama BushnaqOsama Bushnaq, mustafa kishk, Abdulkadir CelikAbdulkadir Celik, Mohamed-Slim Alouini, Tareq Y. Al-Naffouri
Unmanned aerial vehicles (UAVs) have recently received a significant interest to assist terrestrial wireless
networks thanks to their strong line-of-sight links and flexible/instant deployment. However, UAVs’ assistance
is limited by their battery lifetime and wireless backhaul link capacity. At the expense of limited mobility,
tethered UAVs (T-UAVs) can be a viable alternative to provide seamless service over a cable that simultaneously
supplies power and data from a ground station (GS). Accordingly, this paper presents a comparative performance
analysis of T-UAV and regular/untethered UAV (U-UAV)-assisted cellular traffic offloading from a geographical
area that undergoes heavy traffic conditions. By using stochastic geometry tools, we first derive joint distance
distributions between the hot-spot users, the terrestrial base station (TBS), and the UAV. To maximize the endto-
end signal-to-noise ratio, a user association policy is developed, and corresponding association regions are
analytically identified. Then, the overall coverage probability of the U-UAV/T-UAV-assisted system is derived for
given locations of the TBS and the U-UAV/T-UAV. Moreover, we analytically prove that optimal UAV location
falls within a partial surface of the spherical cone centered at the GS. Numerical results show that T-UAV
outperforms U-UAV given that sufficient GS locations accessibility and tether length are provided.


Email Address of Submitting Author

Submitting Author's Institution

King Abdullah University of Science and Technology

Submitting Author's Country

  • Saudi Arabia