UAV-to-UAV Communications in Cellular Networks
M. Mahdi Azari, Giovanni Geraci, Adrian Garcia-Rodriguez, Sofie Pollin

TL;DR
This paper analyzes UAV-to-UAV communication sharing spectrum with cellular ground users, comparing underlay and overlay methods, and finds overlay sharing preferable in urban scenarios for balanced performance.
Contribution
It provides an analytical framework evaluating spectrum sharing strategies for UAV-to-UAV and ground user communications considering realistic models.
Findings
Underlay sharing can slightly impair GUE uplink performance due to UAV interference.
UAV direct links are less impactful on base stations because of antenna sidelobes.
Overlay sharing is more suitable in urban scenarios with many UAV pairs.
Abstract
We consider a cellular network deployment where UAV-to-UAV (U2U) transmit-receive pairs share the same spectrum with the uplink (UL) of cellular ground users (GUEs). For this setup, we focus on analyzing and comparing the performance of two spectrum sharing mechanisms: (i) underlay, where the same time-frequency resources may be accessed by both UAVs and GUEs, resulting in mutual interference, and (ii)overlay, where the available resources are divided into orthogonal portions for U2U and GUE communications. We evaluate the coverage probability and rate of both link types and their interplay to identify the best spectrum sharing strategy. We do so through an analytical framework that embraces realistic height-dependent channel models, antenna patterns, and practical power control mechanisms. For the underlay, we find that although the presence of U2U direct communications may worsen the…
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