NTIA Urges FCC to Adopt WRC-19 Protections in 24 GHz Band

NTIA asked the FCC to harmonize rules for the 24 GHz band with decisions made at the World Radiocommunication Conference in 2019. The FCC approved an NPRM 3-2 in December examining changes to the rules, over dissents by Commissioners Brendan Carr and Nathan Simington (see 2312260043). Reactions have been mixed (see 2402280037). NTIA filed joint comments, posted Thursday in docket 21-186, with NOAA and NASA. The NPRM proposes “an important step to honor our country’s international commitments,” they said. The NPRM “astutely explains” that passive satellite sensors operated by the federal government on frequencies allocated to the earth exploration satellite service “are particularly vulnerable to harmful interference,” the filing said. These passive sensors “are designed to look downward toward Earth and measure the power level of naturally occurring radio emissions from molecules in the atmosphere that occur at specific frequencies. Very sensitive instrumentation is necessary to measure such weak, natural signals.” NTIA said NOAA wants the FCC to apply the Resolution 750 limits to fixed services in the band and not just to international mobile telecommunications, “noting it is unaware of any technical justification for applying different emission limits to fixed systems.” That latter point was opposed by industry. The limits should apply to only mobile base stations and handsets and not other operations the rules allow, including point-to-point operations, point-to-multipoint operations and transportable devices like fixed wireless access customer premises equipment, Qualcomm said. “The Commission distinguishes these types of operations in its Part 30 rules, particularly when it comes to emissions limits,” Qualcomm said: “NTIA’s request to apply Resolution 750 to fixed operations is outside the scope of and inconsistent with the FCC’s longstanding regulatory framework.” Ericsson supported the WRC-19 limits but urged an exemption for indoor small cells “given the interference protection factors inherent in indoor operations and the unnecessary costs the limits would impose on the development and deployment of those systems.” CTIA said the FCC should adopt the WRC-19 recommendations but go no further. The group noted that companies invested $2 billion to buy licenses in the 24 GHz auction. “Beyond the FCC’s already balanced approach, the emission limits adopted by WRC-19 go above and beyond what is necessary to protect passive satellite operations,” CTIA said. “Any suggestions to expand emission limits beyond the WRC-19 agreement would be unnecessary and cause substantial harm to 24 GHz licensees,” the group said. “To avoid undermining licensees’ investment-backed expectations in acquiring 24 GHz band licenses, the Commission should reject proposals that would go beyond implementing the consensus-based decisions made at WRC-19,” T-Mobile agreed.