Spectrum Sharing in Drone Small Cells

In this paper, we study drone small cells (DSCs) network modeled by 3D Poisson point process. We further study an underlay spectrum sharing between the 3D DSCs network and traditional cellular networks modeled by 2D Poisson Point Processes. We derive the explicit expressions for the downlink DSCs coverage probability and achievable throughput.We obtain the optimal density of DSCs aerial base stations that maximizes the DSCs network throughput while satisfying the cellular network efficiency constraint. Our analytical and numerical results show that the maximized throughput of the DSCs user increases almost linearly with the increase of the DSCs outage constraint. However, to protect the cellular user, the potential throughput of the DSCs user should stop increasing when it encounters the cellular network efficiency loss constraint.