Evolution of Non-Terrestrial Networks From 5G to 6G: A Survey.
Mohammad Mahdi AzariSourabh SolankiSymeon ChatzinotasOltjon KodheliHazem SallouhaAchiel ColpaertJesus Fabian Mendoza MontoyaSofie PollinAlireza HaqiqatnejadArsham MostaaniEva LagunasBjörn E. OtterstenPublished in: IEEE Commun. Surv. Tutorials (2022)