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Uplink and downlink frequency7/14/2023 ![]() IMT would squeeze out FSS from that area. Analyses and practical experience showed that once IMT was deployed in an area, general satellite reception would be impossible at the same or at adjacent frequency bands in that area, i.e. When IMT started moving into FSS frequency bands, it was first in satellite downlink bands. At the same time, it is important to ensure that reasonable and realistic applications can continue to operate with an adequate service quality. In doing so, it is important that both sides are prepared to share the burden of co-existence and that both sides do not claim excessive protection based on unrealistic parameters and inflated protection requirements, nor claim unreasonable operational flexibility and power levels. If efficient spectrum usage is to be achieved, it is necessary that both sides work constructively together to identify mutually agreeable solutions that are technically consistent. As a result, decisions have become largely political where one side “wins” and the other side “loses”. Over the years, the debates over IMT moving into satellite frequency bands have become very polarized with little will on either side to recognize the needs of the other side and constructive dialogue has become increasingly difficult to achieve. The controversy that has emerged between the two sides therefore stems from the fight for access to scarce spectrum resources and not a fight over customers or market shares. Yet, as demand for mobile broadband is increasing, IMT has been forced to move up in frequency to find the required bandwidths, and as a consequence looking at bands used by FSS where analyses and practical experience have shown technical difficulties for co-existence. Therefore, there should be no reason for IMT and FSS to fight each other. by providing backhaul services or by offering solutions where IMT for technical and/or economic reasons is unable to offer the services. Quite on the contrary, the two are complementary to each other where FSS can support IMT e.g. International Mobile Telecommunications (IMT) and Fixed-Satellite Service (FSS) offer very different applications and there is no commercial competition between them. Contributor – Per Hovstad, Principal Spectrum Engineer, AsiaSat
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