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Using drones as flying base stations is a promising approach to enhance thenetwork coverage and area capacity by moving supply towards demand whenrequired. However deployment of such base stations can face some restrictionsthat need to be considered. One of the limitations in drone base stations(drone-BSs) deployment is the availability of reliable wireless backhaul link.This paper investigates how different types of wireless backhaul offeringvarious data rates would affect the number of served users. Two approaches,namely, network-centric and user-centric, are introduced and the optimal 3Dbackhaul-aware placement of a drone-BS is found for each approach. To this end,the total number of served users and sum-rates are maximized in thenetwork-centric and user-centric frameworks, respectively. Moreover, as it ispreferred to decrease drone-BS movements to save more on battery and increaseflight time and to reduce the channel variations, the robustness of the networkis examined as how sensitive it is with respect to the users displacements.

Backhaul-aware Robust 3D Drone Placement in 5G+ Wireless Networks