Globally, the C-band refers to frequencies between 4 and 8GHz. In the U.S., however, carriers don’t have access to all those frequencies, and right now, they’re only using frequencies between 3.7 and 3.98GHz. That means that while mid-band is a subset of Sub-6, C-band in the U.S. is a subset of mid-band frequencies .31 Oca 2022
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mmWave refers to higher frequency radio bands ranging from 24GHz to 40GHz, and Sub-6GHz refers to mid and low-frequency bands under 6GHz .10 May 2021
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