In 2015, in the U.S., the FCC authorized the use of the 3.5 GHz band (3550 to 3700 MHz) for broadband wireless access. Previously limited to the 3.65 GHz, the new ruling opened up an additional 150 MHz of spectrum to be shared by operators and service providers. This portion of the band had previously been protected and limited to use by the US Navy and other DoD members.
The new ruling calls for the band to be shared, which means that new protocols and platforms needed to be developed in order to properly manage the use of the band. The band will use Dynamic Spectrum Allocation, which will help with more efficient use of the spectrum.