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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) communications. Specifically,the UAV with a high signal to noise ratio (SNR) for the U2I link uploads itscollected data directly to the BS through U2I communication, while the UAV witha low SNR for the U2I link can transmit data to a nearby UAV throughunderlaying U2U communication for the sake of quality of service. We firstpropose a cooperative UAV sense-and-send protocol to enable the UAV-to-Xcommunications, and then formulate the subchannel allocation and UAV speedoptimization problem to maximize the uplink sum-rate. To solve this NP-hardproblem efficiently, we decouple it into three sub-problems: U2I and cellularuser (CU) subchannel allocation, U2U subchannel allocation, and UAV speedoptimization. An iterative subchannel allocation and speed optimizationalgorithm (ISASOA) is proposed to solve these sub-problems jointly. Simulationresults show that the proposed ISASOA can upload 10\% more data than the greedyalgorithm.

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