Stochastic Modelling of LoS Aggregate Interference in Uplink of Aerial Base Station-assisted Network

The progress in unmanned aerial vehicles technology nowadays is boosting the development of Aerial Base Station (ABS) systems to provide on-demand Line of Sight (LoS) uplink connectivity. The limited capacity of wireless networks in a crowed area could result in temporary connectivity congestion. To face with this problem, the deployment of ABS to support the offloading of the demand could represent a solution in the next future. In fact, the ground-to-air channels experience limited scattering and the probability of having only LoS link above a certain altitude is higher than ground-to-ground communications. LoS prevalence provides a stable and reliable link for a target ground user, but interference impairs the communication itself, thus affecting the connectivity. Starting from the above considerations, the aim of this paper is to investigate a stochastic framework to model the impact of the uplink LoS aggregated users interference to derive the outage probability. The interfering nodes, i.e. user equipments accessing the same network cell, are scattered on the ground according to a Poisson point process in the two dimensional area. First, we show analytically how essential physical parameters involved in the ground-to-air communication affect the quality of service. Then, the mathematical derivation is validated by means of numerical simulations.