FCC announces first spectrum-sharing deal

With the Federal Communications Commission's  Sept. 16 approval of the first initial commercial deployments for Citizens Broadband Radio Service, federal spectrum managers are pointing to the new arrangement as a model for things to come.

Under the new spectrum-sharing arrangement, CBRS users will share frequency allocations on the 150 MHz of spectrum in the 3.5-3.7 MHz range with incumbent Defense Department users' shipborne radar applications.

The commercial services will leverage a three-tiered sharing model that gives incumbent DOD users priority access when needed while still allowing licensed and unlicensed access for commercial private and general access services.

The commercialized services will be sold under the "OnGo" branding umbrella for a variety of applications, from rural broadband connections to enterprisewide in-building cellular coverage to sports stadiums and private networks.

The approvals mark the first commercial applications for the CBRS spectrum since the FCC, the Commerce Department's National Telecommunications and Information Administration (NTIA) and DOD began planning to open the federal spectrum up for shared use in 2010.

The sharing arrangement, which gives DOD priority access to the top tier of the spectrum for Navy radar applications, is a model for federal agencies to consider for their own spectrum holdings as commercial demands on the limited wireless spectrum increase, FCC Commissioner Mike O'Rielly said at an OnGo kickoff event on Sept. 18 in Washington, D.C.

"Clearing spectrum should always be a goal. The dynamic sharing model has been created and can serve as a blueprint when sharing is the only option" in an increasingly cramped spectrum world, O'Rielly said.

A team of DOD engineers and spectrum experts worked with industry over the years to develop a structure that would give the defense agencies access to their spectrum at 3.5MHz, but also allow an ecosystem of commercial services to develop alongside them, Frederick Moorefield, deputy CIO for Command, Control, Communications and Computers and Information Infrastructure Capabilities at the Defense Department, explained. "The key to the success for other federal agencies working out spectrum-sharing arrangements is talking directly to industry guys," he said.

The sharing process "wasn't always pretty," O'Rielly said. Thorny issues such as creating exclusion zones along coastlines to protect Navy radar applications had to be worked out, eventually being turned into smaller, tighter "protection zones" through collaboration of industry, NTIA and DOD teams. "This dynamic sharing shows that spectrum owners can be protected, but also accommodate new users," O'Rielly said.

The FCC is considering other bandwidths for dynamic sharing, including the "C Band," directly adjacent to the CBRS band. "This spectrum is crucial, because it could be combined with CBRS to provide the kind of large spectrum channel that could support 5G" services, O'Rielly said.

This article was first posted to FCW, a sibling site to GCN.

About the Author

Mark Rockwell is a senior staff writer at FCW, whose beat focuses on acquisition, the Department of Homeland Security and the Department of Energy.

Before joining FCW, Rockwell was Washington correspondent for Government Security News, where he covered all aspects of homeland security from IT to detection dogs and border security. Over the last 25 years in Washington as a reporter, editor and correspondent, he has covered an increasingly wide array of high-tech issues for publications like Communications Week, Internet Week, Fiber Optics News, tele.com magazine and Wireless Week.

Rockwell received a Jesse H. Neal Award for his work covering telecommunications issues, and is a graduate of James Madison University.

Click here for previous articles by Rockwell. Contact him at mrockwell@fcw.com or follow him on Twitter at @MRockwell4.


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