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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

Moving Closer to Making Spectrum Sharing at 3.5 GHz a Reality

November 5, 2018

In 2015, the Federal Communications Commission (FCC) established the Citizens Broadband Radio Service (CBRS) to accommodate sharing in the 3.5 GHz band between incumbent users — mostly Navy radar systems — and a variety of new commercial users.

The technology that will power this sharing, a new kind of dynamic spectrum access system, didn’t exist when the FCC adopted the rulemaking three years ago. To help test this technology as it was being developed, the FCC sought out the independent technical expertise of NTIA’s Institute for Telecommunication Sciences (ITS). The data gathered via these laboratory tests will be provided to the FCC to support its certification processes for eventual CBRS field operations.

We have made significant progress in our work on testing the two technical linchpins of these CBRS systems:  Environmental Sensing Capability (ESC) sensors and Spectrum Access Systems (SAS). The ESC sensors are designed to alert the associated SASs when Federal radar systems are operating in the band, so that the SAS can take immediate action to manage the CBRS devices to prevent interference.

ITS has released a study guide for Spectrum Access System testing via GitHub. The guide consists of samples of tests that will be conducted on Spectrum Access Systems. The tests will include a wide variety of scenarios and situations to test the systems’ ability to manage CBRS devices.

Topics
Institute for Telecommunication Sciences
Spectrum Management
3550-3650 MHz

Dynamic Protection Areas Will Spur Spectrum Sharing

May 25, 2018

One of NTIA’s most important responsibilities is working with the Federal Communications Commission (FCC) to find spectrum to support competitive and ubiquitous 5G broadband wireless service in America. Efficient use of spectrum is critical as we look to get more spectrum into the hands of wireless innovators while protecting federal users. To help achieve this goal, NTIA engineers have facilitated the creation of a new concept in flexible spectrum sharing, Dynamic Protection Areas (DPAs), to enable increased access to the 3.5 GHz Citizens Broadband Radio Service (CBRS) band.

On May 22, in response to a letter from NTIA, the FCC issued a waiver Order that allows each spectrum access system (SAS) administrator in the 3.5 GHz band to use DPAs. This action will allow more devices to operate in the band more quickly than anticipated, promoting efficient spectrum use and more investment.

Topics
Spectrum Management
3550-3650 MHz

Remarks of Assistant Secretary Redl at CTIA's Race to 5G Summit

Remarks of David J. Redl
Assistant Secretary of Commerce for Communications and Information
CTIA’s Race to 5G Summit
Washington, D.C.
April 19, 2018

--As Prepared for Delivery--
 

Thank you. It’s great to be here and see such widespread commitment to the United States winning the race to 5G. As you’ve no doubt heard today, 5G and the technologies it will enable promise transformative changes that will improve health care, advance manufacturing and benefit public safety.

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