Satellite, Wireless Clash Over OOBE Limits for Protecting UMFUS From ESIMs
Satellite and wireless interests remain miles apart on what protections upper microwave flexible use services (UMFUS) need from adjacent band non-geostationary orbit (NGSO) earth stations in motion (ESIM) in the 28.35-28.6 GHz band, per FCC docket 18-315 replies posted Wednesday.…
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No one has shown how NGSO ESIMs differ from blanket-licensed fixed NGSO terminals or why a more restrictive out-of-band emissions (OOBE) limit is needed for 28 GHz NGSO ESIMs than for NGSO fixed satellite service (FSS) earth stations or geostationary ESIMs, the Satellite Industry Association said. Viasat said wireless interests haven't shown technical analyses demonstrating any interference potential for UMFUS. Nor have they made "any credible claims" that current limits aren't enough to protect UMFUS when they propose OOBE restrictions for some earth stations in the 28 GHz band. Amazon's Kuiper said existing limits for NGSO ESIMs are sufficient because of the frequent handoffs and repointing to continuously mobile NGSO satellites cutting potential for in-line events. It said NGSO ESIM systems will likely maintain high elevation angles and avoid obstructions. Kepler also commented. Satellite interests are downplaying the interference potential of ESIM operations in the 28.35-28.6 GHz band to adjacent-band UMFUS operations, and the FCC needs to set the same OOBE limits for NGSO ESIM operators as all commercial wireless services, Verizon and U.S. Cellular said. CTIA backed that limit and supported keeping the 50 MHz guard band between NGSO FSS and UMFUS licensees.