In the United States regulated by the FCC CBRS Tier 3 is available to "general authorized users." You can operate a private lte-network so long as you authorize and follow the spectrum rules. From the FCC Website

> The GAA tier is licensed-by-rule to permit open, flexible access to the band for the widest possible group of potential users. GAA users can operate throughout the 3550-3700 MHz band. GAA users must not cause harmful interference to Incumbent Access users or Priority Access Licensees and must accept interference from these users. GAA users also have no expectation of interference protection from other GAA users. Technical rules for GAA users can be found in Subpart E of Part 96.