ESIMs Not Showing Any Sign of Causing UMFUS Interference in 28 GHz Band, ViaSat Says
The constant movement of non-geostationary orbit satellites and earth stations in motion using the 28.35-28.6 GHz band means less potential for interference with adjacent upper-microwave flexible use service because out-of-band emissions (OOBE) in the direction of the UMFUS receiver would…
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be fleeting, Viasat said in a docket 18-315 posting Tuesday. ESIMs already are substantially deployed in the band for fixed satellite service (FSS) use, and there haven't been reports of interference, it said. Viasat also submitted a technical analysis it said showed existing OOBE limits will protect UMFUS in the 27.5-28.35 GHz band. The Satellite Industry Association said any more-restrictive OOBE limit than what exists for NGS FSS earth stations of geostationary orbit (GSO) ESIMs would be baseless. Noting the FCC didn't adopt ESIM-specific OOBE limits for communicating with GSO systems, it said the same rationale holds true for NGSO systems.