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Unmanned aerial vehicles (UAVs) are widely exploited in environmentmonitoring, search-and-rescue, etc. However, the mobility and short flightduration of UAVs bring challenges for UAV networking. In this paper, we studythe UAV networks with n UAVs acting as aerial sensors. UAVs generally haveshort flight duration and need to frequently get energy replenishment from thecontrol station. Hence the returning UAVs bring the data of the UAVs along thereturning paths to the control station with a store-carry-and-forward (SCF)mode. A critical range for the distance between the UAV and the control stationis discovered. Within the critical range, the per-node capacity of the SCF modeis O(n/log n) times higher than that of the multi-hop mode. However, theper-node capacity of the SCF mode outside the critical range decreases with thedistance between the UAV and the control station. To eliminate the criticalrange, a mobility control scheme is proposed such that the capacity scalinglaws of the SCF mode are the same for all UAVs, which improves the capacityperformance of UAV networks. Moreover, the delay of the SCF mode is derived.The impact of the size of the entire region, the velocity of UAVs, the numberof UAVs and the flight duration of UAVs on the delay of SCF mode is analyzed.This paper reveals that the mobility and short flight duration of UAVs havebeneficial effects on the performance of UAV networks, which may motivate thestudy of SCF schemes for UAV networks.

Capacity and Delay of Unmanned Aerial Vehicle Networks with Mobility