ESIM Order Released, Includes FNPRM on 28 GHz UMFUS Interference
The earth stations in motion order approved at Wednesday's FCC meeting (see 2005130057) and released Thursday (see here) includes a Further NPRM with more questions about potential ESIM out-of-band emission (OOBE) interference into the adjacent 28.35-28.6 GHz band used by…
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upper microwave flexible use service (UMFUS), according to our side-by-side comparison of it and the draft. Verizon and U.S. Cellular raised concerns about such potential interference (see 2005050034). The order said the agency will still take and process ESIM applications using the 28.4-28.6 GHz band to avoid holding up potential ESIM operations, but approval will be conditioned on compliance with future determinations in the proceeding. The FNPRM asks if such steps as a guard band provide adequate protection if there's excessive interference with UMFUS. The approved order deferred consideration of allowing ESIMs operate in the 28.35-28.4 GHz band while the FCC studies the potential for ESIM OOBE interference in the adjacent 27.5-28.35 GHz band.