FCC’s Upper C-band Proposal Seeks Aviation Input

The U.S. Federal Communications Commission (FCC) has posted a draft notice of proposed rulemaking (NPRM) on its previously disclosed plan to auction up to 180 MHz of spectrum in the 3.87 to 4.2 GHz (the upper C-band) for next-gen wireless services. Unlike past rulemaking on lower C-band expansion that caused interference with radio altimeters, comments on this NPRM are expressively being sought from the aviation community.

Radio altimeters operate in the adjacent 4.2- to 4.4-GHz band. The FCC acknowledged its failure in previous frequency band expansions to address adjacent band inequities. Consequently, we “will necessitate broad-based and proactive engagement from relevant industry stakeholders, as well as our federal partners,” including the FAA.

The FCC intends to apply the same framework used in the 2020 lower C-band auction—3.7 to 3.98 GHz—which allocated 280 MHz for flexible wireless use and expanded 5G access. However, it also caused flight disruptions due to radio altimeter interference, and to resolve the issues, avionics manufacturers were forced to hurry the development of radio altimeter retrofits, followed by FAA airworthiness directives in 2023.

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