Cellular UAV-to-X Communications: Design and Optimization for Multi-UAV Networks

摘要

In this paper, we consider a single-cell cellular network with a number ofcellular users~(CUs) and unmanned aerial vehicles~(UAVs), in which multipleUAVs upload their collected data to the base station (BS). Two transmissionmodes are considered to support the multi-UAV communications, i.e.,UAV-to-infrastructure (U2I) and UAV-to-UAV~(U2U) transmissions. Specifically, aUAV either uploads its collected data to the BS through U2I overlaytransmission or offloads the data to a neighboring UAV through U2U underlaytransmission when facing on-board battery outage. We formulate the subcarrierallocation and trajectory control problem to maximize the uplink sum-ratetaking the delay of sensing tasks into consideration. To solve this NP-hardproblem efficiently, we decouple it into three sub-problems: U2I and cellularuser (CU) subcarrier allocation, U2U subcarrier allocation, and UAV trajectorycontrol. An iterative subcarrier allocation and trajectory control algorithm(ISATCA) is proposed to solve these sub-problems jointly. Simulation resultsshow that the proposed ISATCA can upload 20% more data than the one withoutU2U offloading, and 10% more than that obtained by the random algorithm.