These concerns triggered delays in C-band deployment and more recently prompted the wireless carriers to hold off on activating some 5G towers near airports. AT&T and Verizon have been tussling with the Federal Aviation Administration over the agency’s worries that the new wireless service might interfere with certain airplane radio altimeters that rely on similar spectrum. This new swath of spectrum has caused yet more controversy for 5G (see “ Worried about 5G and Cancer? Here’s Why Wireless Networks Pose No Known Health Risk,” 6 December 2019). If the term “C-band” sounds familiar, it may be because you remember the days of large C-band satellite dishes that have now largely been replaced by smaller, fixed Ku-band dishes like those from Dish and DirecTV.
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C-band support provides download speeds on the order of 1 gigabit per second under ideal conditions, though everyday performance is likely to be slower. That changed on 19 January 2022 when AT&T and Verizon flipped the switch on C-band support, which refers to a swath of radio airwaves in the mid-band spectrum, similar to those used by T-Mobile. In the middle, neither AT&T nor Verizon could offer service because they lacked access to the necessary parts of the spectrum. Rival carriers AT&T and Verizon were at a major competitive disadvantage because they could provide only low-band 5G service nationwide, supplemented with high-band service in nooks and crannies of a few major cities. “Low-band” service bathing much of the country (including rural areas) with data speeds roughly on par with traditional 4G LTE.Slower but still zippy “middle-band” service blanketing hundreds of cities and towns.Blazingly fast “high-band” service, technically known as millimeter wave, in pockets of some cities.At the time, T-Mobile was the best 5G carrier option for most people in the United States because of its comprehensive three-tier service: But, as I noted in “ The iPhone Gets 5G, but What’s It Like in Real-World Use?” (19 November 2020), the high-speed wireless data service’s performance differed dramatically depending on where you lived and which wireless carrier you used.
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