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3550-3650 MHz

The Federal Communications Commission (FCC) created the Citizens Broadband Radio Service (CBRS) in the 3550-3650 MHz band in 2015. Since then, NTIA has worked closely with the FCC and the Department of Defense (DOD) to coordinate spectrum sharing among CBRS operators and existing federal users in the band. The sharing approach includes creating Dynamic Protection Areas to protect federal wireless operations from potentially harmful interference by new CBRS systems.

Transition Plans for 3550-3650 MHz Auction 

The FCC has announced plans for a CBRS spectrum auction in the 3550-3650 MHz band. The Commercial Spectrum Enhancement Act enables federal agencies to seek reimbursement for transition costs associated with an auction, and these plans must be made public no later than 120 days before the auction begins. NTIA provided initial estimates of sharing costs to the FCC in December 2019.  These estimated costs were reviewed by OMB and approved by Congress. The final transition plans are listed below.

  • DOD Office of the Chief Information Officer — xlsx | pdf
  • DOD Defense Spectrum Organization — xlsx | pdf
  • U.S. Air Force — xlsx | pdf
  • U.S. Army — xlsx | pdf
  • U.S. Navy and U.S. Marine Corps — xlsx | pdf

Additional Transition Information

  • Status of transition
    These files provide the Status of Transition
    for 3550-3650 MHz frequency
    assignments as of November 17, 2023 – xlsx | pdf – 

  • Agency Transition Plan Contact Information [--xlsx--|--pdf--]

Archived Transition Plans

Related content

Remarks of Associate Administrator Doug Kinkoph at the UTC Broadband Workshop

Thank you for inviting me to speak with you today. I hope you are all staying safe and healthy. At NTIA, most of our employees continue to telework, but we have maintained full continuity of our operations across our offices. NTIA, of course, has long recognized the importance of broadband. The Internet is an engine for innovation and growth and is critical to full participation in the 21st century economy.

NTIA Letter to FCC on Promoting Investment in the 3550-3700 MHz Band

June 23, 2020
Gn Docket N0. 17-258

NTIA and the Department of Defense (DoD) have worked closely with the Federal Communications Commission (FCC) as it implements the rules governing Citizens Broadband Radio Service (CBRS) in the 3550-3700 MHz (3.5 GHz) band in the above-referenced proceeding. The collaborative approach taken by government and industry to share the 3.5 GHz band has enabled commercial access to this primary mid-band spectrum for 5G deployments.  This letter is to notify you of changes to the protection criteria for eleven designated naval port locations.


NTIA Releases Spectrum Occupancy Data to Help Enable Successful Sharing in the Mid-Band

April 23, 2020

The Trump Administration is poised to make significant progress this year in efforts to promote new 5G opportunities through mid-band spectrum sharing. In January, NTIA reported considerable potential for spectrum sharing options in the 3450-3550 MHz band. This summer, years of work by NTIA engineers in collaboration with the Federal Communications Commission (FCC) and the Department of Defense will culminate in an FCC auction of Citizens Broadband Radio Service (CBRS) licenses in the adjacent 3550-3650 MHz band.

Incumbent federal operations in both these bands are primarily military radars and include shipborne, airborne, and land-based systems. But limited information exists about actual usage of these bands – what’s sometimes known as spectrum occupancy data.

Today, NTIA’s research lab, the Institute for Telecommunication Sciences (ITS), published a summary report that presents data collected from a two-year effort to measure spectrum occupancy in these two key bands. Interim occupancy reports were provided to NTIA engineers throughout 2018 and 2019, helping to inform CBRS policy. Today’s publication makes a summary of the measurements available to the public for the first time.

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