The FCC moved ahead with a proposal to open up to 180 MHz of Upper C-band spectrum (3.98–4.2 GHz) for commercial 5G and emerging 6G services, adopting a Notice of Proposed Rulemaking (NPRM) that clears the way for a 2027 auction. The action represents one of the most significant mid-band initiatives since the 2020 Lower C-band auction and fulfills a core requirement of the One Big Beautiful Bill Act, which restored the FCC’s auction authority and mandated the release of at least 100 MHz in the Upper C-band by July 2027. The Commission intends to build on its earlier C-band transition framework, which accelerated mid-band 5G deployment nationwide.
The NPRM opens a wide-ranging inquiry into technical rules, auction timing, and relocation procedures for satellite operators currently using the band. The FCC will also examine coexistence mechanisms for protecting radio altimeters in the adjacent 4.2–4.4 GHz band, a long-running point of friction between the aviation and wireless sectors. The Commission said its timeline requires close coordination with the FAA and NTIA as aviation systems undergo new resilience upgrades and as federal agencies refine their approach to mid-band coexistence.
Chairman Brendan Carr cast the proceeding as a major step after a prolonged period in which new commercial spectrum was stalled. He pointed to the White House’s ten-week “spectrum sprint,” new congressional mandates, and industry momentum that has driven recent mid-band progress. Carr stressed that the Upper C-band will play a foundational role in strengthening U.S. competitiveness in both 5G expansion and early 6G architectures, especially as operators look for mid-band capacity to support fixed wireless access and dense urban coverage.
• Proposes auctioning up to 180 MHz in the 3.98–4.2 GHz range for 5G and 6G
• Targets July 2027 auction deadline required by the One Big Beautiful Bill Act
• Reviews relocation and transition approaches for satellite operators in the band
• Evaluates technical protections for adjacent-band aviation altimeters
• Builds on the Lower C-band model that accelerated U.S. mid-band 5G coverage
• Requires close coordination with the FAA, NTIA, and affected industry sectors
• Focuses on rapid rulemaking, transition timing, and cost-efficient incumbent accommodation
“Bringing this broad segment of mid-band spectrum to market will strengthen America’s foundation for emerging 5G and 6G innovations while delivering new and affordable broadband services to communities across the country,” said FCC Chairman Brendan Carr. “It is easy to forget how unlikely today’s milestone once seemed. As late as last year, America remained stuck in what I called a ‘spectrum malaise.’ Our auction authority had lapsed. Band studies were stalled. And there was no plan to free up even a single megahertz. Fast forward a few months—and America is getting back on track. Today’s item shows what’s possible when Congress restores a real spectrum pipeline with deadlines, targets, and a mandate to deliver. We can land this plane by replicating our successes from the Lower C-band, and I am confident our team—and our partners at FAA and NTIA—are up to the challenge.”
🌐 Analysis
The Upper C-band initiative marks one of the FCC’s most ambitious mid-band efforts since the first C-band auction, reflecting sustained pressure to rebuild the U.S. commercial spectrum pipeline. The tight timeline underscores significant coordination requirements between aviation and wireless stakeholders as new altimeter standards roll out. It also aligns with broader NTIA efforts to expand mid-band allocations for 5G and early 6G testbeds, matching international moves in Europe and Asia that increasingly target the 3–7 GHz range for next-generation mobile services.
