Azari, M. MahdiGeraci, GiovanniGarcía Rodríguez, AdriánPollin, Sofie2021-03-302021-03-302020Azari MM, Geraci G, Garcia-Rodriguez A, Pollin S. UAV-to-UAV communications in cellular networks. In: 2019 IEEE 30th Annual International Symposium on Personal, Indoor and Mobile Radio Communications (PIMRC); 2019 Nov 21;Istanbul, Turkey. New York: IEEE; 2019. p. 1-7. DOI: 10.1109/PIMRC.2019.8904448http://hdl.handle.net/10230/46993Comunicació presentada a: 2019 IEEE 30th Annual International Symposium on Personal, Indoor and Mobile Radio Communications (PIMRC), celebrat el 21 de novembre de 2019 a Istambul, Turquia.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 heightdependent 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 uplink performance of GUEs, such effect is limited as base stations receive the power-constrained UAV signals through their antenna sidelobes. In spite of this, our results lead us to conclude that in urban scenarios with a large number of UAV pairs, adopting an overlay spectrum sharing seems the most suitable approach for maintaining a minimum guaranteed rate for UAVs and a high GUE UL performance.application/pdfeng© 2020 IEEE. Personal use of this material is permitted. Permission from IEEE must be obtained for all other uses, in any current or future media, including reprinting/republishing this material for advertising or promotional purposes, creating new collective works, for resale or redistribution to servers or lists, or reuse of any copyrighted component of this work in other works. http://dx.doi.org/10.1109/PIMRC.2019.8904448info:eu-repo/semantics/conferenceObjecthttp://dx.doi.org/10.1109/PIMRC.2019.8904448UAV-to-UAV communicationsD2D communicationsCellular networksSpectrum sharingStochastic geometryinfo:eu-repo/semantics/openAccess