CBRS
CBRS (Citizens Broadband Radio Service) is a 3.5 GHz spectrum band the FCC opened up for shared use in 2020. Used by carriers (T-Mobile, Dish, Verizon) for additional capacity and by enterprises for private cellular networks.
CBRS stands for Citizens Broadband Radio Service. It's a slice of 3.5 GHz spectrum (3550-3700 MHz, just below C-band) that the FCC opened up in 2020 with a unique three-tier sharing model: incumbent users (Navy radar, satellite earth stations), priority access licensees (carriers and enterprises that bought licenses at auction), and general authorized access (anyone, on a coordinated basis).
Why CBRS matters
- Carriers use it for additional 5G mid-band capacity. T-Mobile and Verizon both deploy CBRS as an overlay to boost capacity in urban areas. Dish uses CBRS as a foundational layer of its still-young 5G network.
- Enterprises run private cellular on it. Manufacturing plants, hospitals, ports, college campuses, and large warehouses can deploy their own private 4G/5G networks on CBRS without needing a carrier license. Coverage is tightly controlled to a building or campus; SIMs/eSIMs in employee devices authenticate to the local network.
- It's a managed band. A central database (the "Spectrum Access System") coordinates between users to prevent interference. Devices using CBRS authenticate with the SAS and adjust power/channels dynamically.
For consumers
CBRS is usually invisible to consumer users — your phone connects to a tower, the carrier handles which band; you don't pick CBRS specifically. If your phone supports band n48 (the 3.5 GHz CBRS band), you can use CBRS-deployed 5G when the carrier has it lit up at your location.
CBRS Industrial private networks are a separate world: when you walk into a hospital or factory using a private 4G/5G network, your personal phone usually doesn't connect to it (you'd need a SIM authorized for that private network). The hospital's own scanners, monitors, and IoT devices use the private network instead.