Space-Time Spectrum Sharing for Unmanned Aerial Vehicle Networks

In this paper, we study the spectrum sharing of unmanned aerial vehicle (UAV) networks. Multiple primary users (PUs) are distributed on the ground. UAV networks distributed in the three-dimensional (3D) space share the spectrum of PUs. The 3D space is divided into constrained region and unconstrained region by planes. In constrained region, UAVs have temporal spectrum access opportunities. While in the unconstrained region, there is a spatial spectrum hole that allows UAVs to access PUs spectrum without constraints. Moreover, we analyzed the condition of existing a transition region between constrained region and unconstrained region. The bounds of two regions over fading channel are calculated by considering the constraints of the miss detection probability, false alarm probability and the aggregation interference of UAVs to PUs. UAVs can use the height information to decide the way of spectrum sharing.