Uplink Coverage Performance of an Underlay Drone Cell for Temporary Events

TL;DR

This paper analyzes the uplink coverage performance of an underlay drone cell (ABS) during temporary events, deriving analytical expressions and showing the impact of ABS height on coverage probabilities for both the ABS and terrestrial base station.

Contribution

It provides the first analytical framework for uplink coverage probability in drone-assisted underlay cellular networks using stochastic geometry.

Findings

Uplink coverage probability of the ABS can exceed 85% at optimal heights.

Varying ABS height creates a trade-off between coverage probabilities of ABS and TBS.

Analytical results are validated with Monte Carlo simulations.

Abstract

Using a drone as an aerial base station (ABS) to provide coverage to users on the ground is envisaged as a promising solution for beyond fifth generation (beyond-5G) wireless networks. While the literature to date has examined downlink cellular networks with ABSs, we consider an uplink cellular network with an ABS. Specifically, we analyze the use of an underlay ABS to provide coverage for a temporary event, such as a sporting event or a concert in a stadium. Using stochastic geometry, we derive the analytical expressions for the uplink coverage probability of the terrestrial base station (TBS) and the ABS. The results are expressed in terms of (i) the Laplace transforms of the interference power distribution at the TBS and the ABS and (ii) the distance distribution between the ABS and an independently and uniformly distributed (i.u.d.) ABS-supported user equipment and between the ABS and an i.u.d. TBS-supported user equipment. The accuracy of the analytical results is verified by Monte Carlo simulations. Our results show that varying the ABS height leads to a trade-off between the uplink coverage probability of the TBS and the ABS. In addition, assuming a quality of service of 90% at the TBS, an uplink coverage probability of the ABS of over 85% can be achieved, with the ABS deployed at or below its optimal height of typically between 250-500 m for the considered setup.