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

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posted on 17.11.2020, 16:40 by Osama Bushnaq, mustafa kishk, Abdulkadir 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