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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

ITS, Air Force Conduct Flight Tests as Part of Mid-Band Sharing Experiment

May 10, 2021

As consumer, industry, and government demand for 5G services and applications heats up, NTIA’s Institute for Telecommunication Sciences (ITS) is focused on finding ways to make the most efficient use of scarce spectrum resources. Many commercial providers have their eyes on so-called mid-band spectrum because it offers them the best combination of coverage, speed, and latency.  However, many U.S. government departments and agencies, including the Department of Defense (DoD), operate radar and communications platforms important to the nation’s national security and defense in those bands. A few week ago, the skies over Colorado played host to ITS experiments that will contribute to developing solutions to enable dynamic spectrum sharing between commercial and government users. 

Over the course of two hours, a U.S. Air Force high-power radar plane, operating in the 3 GHz spectrum band, repeatedly flew past the Table Mountain Radio Quiet Zone Advanced Communications Test site near Boulder. On the ground, ITS researchers collected data that will begin to shed light on how 5G cellular services might dynamically share spectrum with DoD radar systems. The high-power radar platform provides long range air surveillance; understanding how these system might interact with thousands of terrestrial 5G receivers and transmitters on the ground is essential to the long term viability of 5G networks.  While the flight crew operated the radar system in a variety of modes, ITS engineers measured the radar signals reaching the ground.

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