Science Groups Seek 24 GHz Protections
Replies largely tracked initial comments in docket 21-186 urging caution as the FCC considers adopting out-of-band emissions in the 24 GHz band aligned with limits adopted at the 2019 World Radiocommunication Conference (see 2106290036). The American Geophysical Union, American Meteorological…
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Society and National Weather Association urged more aggressive limits. “At a minimum, the Commission should align its rules with the WRC-19 limits on emissions from active operations in the 24.25-25.25 GHz band into passive sensing in the 23.6-24.0 GHz band,” the groups said: “Implement more stringent rules that expedite limits on emissions to 2024, consistent with European regulators, given continued concerns from the Earth science community about major interference to weather modeling that will ensue before 2027 under WRC-19 rules.” Industry said the WRC agreement is adequate to protect earth exploration satellite services operations. The FCC “took a reasoned approached in initially determining the -13 dBm/MHz (-20 dBW/200 MHz) out of band emission limit in the 24 GHz Report & Order,” said AT&T. The limit “is consistent with other operations surrounding the 23 GHz passive band and should protect EESS operations,” AT&T said. “There is no basis for the Commission to deviate from the carefully crafted agreements reached at WRC-19 with respect to protection levels, timeframe, or types of devices to which the … emission parameters should apply,” said T-Mobile. “Reject any calls to expand limitations on 24 GHz equipment beyond the consensus agreement of the WRC, which would unnecessarily hinder the deployment of 5G service in the United States,” urged CTIA.