Areas with limited CBRS spectrum

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Spectrum Access System (SAS) controls access to the Citizens Broadband Radio Service (CBRS) band everywhere in the United States and protects higher-tier users from interference. In certain areas, interference protection requirements might limit the available spectrum. For more information about regions and zones, see Geography and regions.

In quiet zones

SAS rejects registration requests from Citizens Broadband Radio Service Devices (CBSDs) located in areas near Federal Communications Commission (FCC) field offices and federal government facilities because these locations are highly sensitive to interference. Find a full list of these locations in Section 8.14 of WInnForum Document WINNF-TS-0061.

If a device is located within the National Radio Quiet Zone (NRQZ), confirm the coordination with the NRQZ office before registration and operation. To confirm successful coordination, a Certified Professional Installer (CPI) must provide the NRQZ Case ID furnished by the NRQZ office. Learn how to operate CBSDs in the NRQZ.

Near the Canadian border

Arrangement R between the US and Canada restricts CBRS operations from 3650 MHz to 3700 MHz. Within 8 km of the border, CBSD power is limited. Between 8 km and 56 km of the Canadian border, restrictions vary based on the distance from the border, antenna orientation, and power. For more information, see paragraph R2-SGN-19 of WInnForum Document WINNF-TS-0112 and Section of WInnForum Document WINNF-TS-0061.

Outside the continental US

Due to the proximity to the ocean, many non-contiguous US locations in Hawaii, Alaska, and Guam are included in Dynamic Protection Area (DPA) neighborhoods. There is no Environmental Sensing Capability (ESC) network to protect these DPAs, so spectrum availability from 3550 MHz to 3650 MHz is restricted.

Spectrum is usually available from 3650 MHz to 3700 MHz with some exceptions:

  • Puerto Rico. In many locations, the spectrum from 3650 MHz to 3700 MHz is unavailable due to Grandfathered Wireless Protection Zones (GWPZs). This will change as licenses owned by Grandfathered Wireless Broadband Licensees (GWBLs) expire. To review specific locations with available channels, see CBRS heatmaps.

  • American Samoa, US Virgin Islands, and Northern Mariana Islands. SAS is not authorized to provide CBRS service in American Samoa, the US Virgin Islands, and the Northern Mariana Islands per PNDA-20-110A1. As a result, registration requests from CBSDs are rejected. Operators with an experimental license (STA) in these areas can contact SAS Support.

Near the Mexican border

There are no additional restrictions on CBRS operations near the US border with Mexico.