In its quest for optimal 5G spectrum, AT&T is testing in the 4.4-5 GHz band [telecom]

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The US operators, and the FCC, have made a virtue out of necessity by
taking some creative approaches to address their shortage of optimal
5G spectrum. While the 3.5 GHz C-band is the primary new spectrum band
in which most first-phase 5G networks are being rolled out, in the
USA, this is occupied by federal and other incumbents. With the US
operators lacking access to significant amounts of spectrum in this
band, they will be denied the economies of scale of a global
ecosystem, and AT&T and Verizon will be at a disadvantage to Sprint
(and T-Mobile, assuming they merge), which has midband spectrum in 2.5

Bill Horne
(Remove QRM from my email address to write to me directly)

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