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FCC Takes Next Step Toward Auctioning Upper C Band for 5G

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Oct 30, 2025, 3:04 PM   by Rich Brome   @rbrome.bsky.social

The FCC today released a draft Notice of Proposed Rulemaking to seek comment on a range of options for auctioning off the Upper C Band, valuable mid-band spectrum similar to the Lower C Band (band 77) spectrum that was auctioned off in 2020 – 2022. The Lower C Band is already crucial to the performance of today's US 5G networks. The options include auctioning off bandwidth of anywhere from 100 MHz (the minimum required by legislation) to 180 MHz (spanning 3.98 – 4.16 GHz), a valuable slice that should boost 5G and 6G networks. The FCC is required by that same legislation to hold the auction by July 2027. As with the Lower C Band, there is potential for interference with radio altimeters on airplanes, and the FCC is seeking comment on that as well.

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