The plan was for Verizon and AT&T to rollout 5G in the C-band on December 5, in time for the holiday broadband binging period. But the Federal Aviation Administration (FAA) issued a cryptic advisory on November 2 saying that while there was no evidence of interference, pilots should start watching their altimeters for odd readings. While these same pilots fly into more than 40 countries with some 175 5G networks in operation and report no problems with 5G, the FAA effectively deemed 5G as a threat to aviation safety. Mobile operators paused their rollout for 30 days and sought to reconcile the issue.
The Federal Communications Commission (FCC) undertook a two-year process of technical evaluation to develop the rules for the C-band, working closely with stakeholders from mobile, satellite, aviation, safety, federal regulatory, and other domains.
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