NTN is a network that provides a communication environment, via wireless communication based on satellites and unmanned aerialvehicles, to areas that cannot be served by terrestrial networks. A variety of platforms are already in use, including satellites ingeostationary orbit (GEO), medium earth orbit (MEO), and low earth orbit (LEO), as well as aircraft (Table 1). Within the aircraftcategory, to commercialize NTNs using High Altitude Platform Stations (HAPS) and Unmanned Aircraft Systems (UAS), demonstrationtests are underway to put NTNs into practical use.
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