CBRS is 150 MHz of spectrum – ranging from 3550 – 3700 MHz – in the 3.5 GHz band. Used by the U.S government and other entities.
In April 2015, the FCC established Citizen Broadband Radio Service (CBRS) for shared commercial use of that band. Some of this spectrum will continue to be used by the United States government for radar systems, but will be available for others where not needed by the Navy.
When operating in shared spectrum, users with different levels of priority have access to the band, there are 3 tiers of users in CBRS:
– Tier 1 (higher priority): Naval aircraft carriers, Fixed Satellite Stations, GWBL/GWPZ
– Tier 2: Priority Access Licensee (PAL)
– Tier 3: General Authorized Access (GAA)

Higher priority users must be protected from interference by lower-priority users.

The FCC’s Part 96 regulations govern commercial use of the CBRS band. The Wireless Innovation Forum (WInnForum) is an international group of stakeholders who have developed the standards used in the CBRS band.