AT&T Offers C-Band Earth Station Protection Suggestions
The C-Band Alliance plans for protecting fixed satellite service earth stations from 5G interference, while representing "a great deal of thoughtful effort," could be improved, AT&T said in an FCC docket 18-122 posting Friday. Its lengthy list included designating as…
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unrestricted most of the spectrum reallocated for 5G use; letting terrestrial mobile licensees deploy facilities without any FSS coordination obligations; setting up "adjacent licenses" between unrestricted mobile terrestrial 5G and FSS where terrestrial users would have to use mitigation methods or coordinate with close earth stations; looking into less-restrictive alternatives for protection than 150-meter radiuses around registered earth stations; developing a better record on the satellite viewable arc required for FSS C-band operations after transition, including possible post-transition repacking of users; and developing better user device out-of-band-emissions limits than those proposed by the CBA. AT&T said its work with CommScope points to routes for better spectrum efficiency than what CBA has proposed by allowing some terrestrial use of all of the spectrum not retained for FSS use. It said the size of the adjacent licenses block -- which would replace the 20 MHz guard band CBA has proposed -- would depend on the out-of-band emissions protection levels adopted as well as filter performance. The CBA emailed that AT&T "certainly presents some interesting ideas that should be considered" and that it would analyze whether C-band services would be fully protected under the proposal.