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Ruin Theory for Energy-Efficient Resource Allocation in UAV-assisted Cellular Networks

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Document pages: 29 pages

Abstract: Unmanned aerial vehicles (UAVs) can provide an effective solution forimproving the coverage, capacity, and the overall performance of terrestrialwireless cellular networks. In particular, UAV-assisted cellular networks canmeet the stringent performance requirements of the fifth generation new radio(5G NR) applications. In this paper, the problem of energy-efficient resourceallocation in UAV-assisted cellular networks is studied under the reliabilityand latency constraints of 5G NR applications. The framework of ruin theory isemployed to allow solar-powered UAVs to capture the dynamics of harvested andconsumed energies. First, the surplus power of every UAV is modeled, and thenit is used to compute the probability of ruin of the UAVs. The probability ofruin denotes the vulnerability of draining out the power of a UAV. Next, theprobability of ruin is used for efficient user association with each UAV. Then,power allocation for 5G NR applications is performed to maximize the achievablenetwork rate using the water-filling approach. Simulation results demonstratethat the proposed ruin-based scheme can enhance the flight duration up to 61 and the number of served users in a UAV flight by up to 58 , compared to abaseline SINR-based scheme.

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