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For crowded and hotspot area, unmanned aerial vehicles (UAVs) are usuallydeployed to increase the coverage rate. In the considered model, there arethree types of services for UAV assisted communication: control message,non-realtime communication, and real-time communication, which can cover mostof the actual demands of users in a UAV assisted communication system. Abandwidth allocation problem is considered to minimize the total energyconsumption of this system while satisfying the requirements. Two techniquesare introduced to enhance the performance of the system. The first method is tocategorize the ground users into multiple user groups and offer each group aunique RF channel with different bandwidth. The second method is to deploy morethan one UAVs in the system. Bandwidth optimization in each scheme is proved tobe a convex problem. Simulation results show the superiority of the proposedschemes in terms of energy consumption.

Resource Allocation for UAV Assisted Wireless Networks with QoS Constraints