FCC to Auction Another 100 MHz of Mid-Band Spectrum for 5G

The U.S. Federal Communications Commission decided March 17, 2021 to release another  100 Megahertz of spectrum in the 3.45 GHz band for 5G, using spectrum sharing. 

source: FCC 

Collectively, the 3.45 GHz band and the neighboring 3.5 GHz and 3.7 GHz bands represent 530 megahertz of contiguous mid-band spectrum for 5G. 

Prior to the Citizens Broadband Radio Service and C-band spectrum auctions, most of the available (but not commercially deployed) capacity held by all the U.S. mobile service providers was in the millimeter wave bands. 

source: Allnet 

Future platforms, from 6G onwards, will rely primarily on new millimeter wave assets for capacity augmentation, as the low-band and mid-band coverage assets cannot be increased much more without significant effort.