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In this study, a new method is proposed to confirm the possibility of coexistence between the existing satellite services and potential fifth-generation (5G) cellular services in the millimeter-wave band according to the frequency-designation agenda of International Mobile Telecommunications (IMT)-2020 for 5G. To evaluate the accumulated interference power of numerous 5G systems distributed globally at a satellite receiver, we extend the satellite's interference reception area to the entire coverage area, from which only the land area is extracted using the geospatial terrain data of Earth in three dimensions. This enables more accurate interference assessment than conventional methods that only consider the footprint of the satellite's 3-dB beamwidth. We also place the IMT-2020 (5G) systems in the coverage area using the IMT-2020 parameters and modeling documents for the International Telecommunication Union's coexistence study. The propagation loss is modeled considering the clutter loss, building entry loss, and attenuation from atmospheric gases. Subsequently, we analyze the interference power received by a fixed satellite service (FSS) satellite operating in the same band and an Earth exploration satellite service (EESS) passive sensor operating in an adjacent channel. Our simulation shows that the FSS satellite receives up to 7.9dB more interference than that obtained from the existing method. Although this is a substantial difference, we find that the protection criteria is still satisfied. However, all EESS passive sensors do not meet the protection criteria in most scenarios, and additional frequency separation or interference mitigation techniques are required to protect these sensors. The proposed method is also applicable to the analysis of non-terrestrial network interference from airships, balloons, unmanned aerial vehicles, etc.

Earth station in motion(ESIM), an advanced satellite communications technology, is mounted on ships, aircraft, and land vehicles to provide broadband communication to passengers. It is considered for service in the 27.5～29.5 GHz band, this band is adjacent to the 24.25～27.5 GHz 5G candidate band. Therefore, compatibility between the ESIM and the 5G system must be evaluated. In this study, interference analysis from an aeronautical ESIM(A-ESIM) to a 5G system is performed by applying the minimum coupling loss method. When fuselage loss of the aircraft is not considered, the A-ESIM should be operated at an altitude of approximately 3,180 m to meet the criteria for allowable interference of the 5G system.

In this paper, the possibility of spectrum coexistence of 5th generation mobile communications(IMT-2020) and Fixed-Satellite Service(FSS) uplink in the millimeter wave band is studied based on modeling approach and considering the parameters proposed by the international telecommunication union(ITU) for the frequency assignment of IMT-2020. First, in order to protect the existing FSS, the interference signal of IMT-2020 received by an FSS satellite is calculated and its influence on the satellite is analyzed. Then, the interference received by the IMT-2020 from the FSS earth station is calculated and the minimum separation distance required to avoid interference is presented. Finally, the feasibility of coexistence of both services is evaluated based on simulation results.