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Energy Efficiency and Hover Time Optimization in UAV-based HetNets

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Document pages: 9 pages

Abstract: In this paper, we investigate the downlink performance of a three-tierheterogeneous network (HetNet). The objective is to enhance the edge capacityof a macro cell by deploying unmanned aerial vehicles (UAVs) as flying basestations and small cells (SCs) for improving the capacity of indoor users inscenarios such as temporary hotspot regions or during disaster situations wherethe terrestrial network is either insufficient or out of service. UAVs areenergy-constrained devices with a limited flight time, therefore, we formulatea two layer optimization scheme, where we first optimize the power consumptionof each tier for enhancing the system energy efficiency (EE) under a minimumquality-of-service (QoS) requirement, which is followed by optimizing theaverage hover time of UAVs. We obtain the solution to these nonlinearconstrained optimization problems by first utilizing the Lagrange multipliersmethod and then implementing a sub-gradient approach for obtaining convergence.The results show that through optimal power allocation, the system EE improvessignificantly in comparison to when maximum power is allocated to users (groundcellular users or connected vehicles). The hover time optimization results inincreased flight time of UAVs thus providing service for longer durations.

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