June 2015 | NTIA Technical Report TR-15-517

3.5 GHz Exclusion Zone Analyses and Methodology

Edward F. Drocella Jr.; James C. Richards; Robert L. Sole; Fred Najmy; April Lundy; Paul M. McKenna


This report describes the 3.5 GHz Study. It explains the assumptions, methods, analyses, and system characteristics used to generate the revised exclusion zones for small-cell commercial broadband systems to protect federal radar operations (ship and land based) from aggregate interference in the band 3550–3650 MHz. The 3.5 GHz Study’s exclusion zones are compared with the exclusion zones that were generated in the Fast Track Report, which considered macro-cell operations.

This report was reissued in March 2016 to correct typographical errors.

Keywords: radar; spectrum sharing; FCC; NTIA; 3.5 GHz band; exclusion zones; 3550-3650 MHz; Citizens Broadband Radio Service (CBRS)

For technical information concerning this report, contact:

Edward F. Drocella
National Telecommunications and Information Administration
(202) 482-2608

To request a reprint of this report, contact:

Lilli Segre, Publications Officer
Institute for Telecommunication Sciences
(303) 497-3572

Disclaimer: Certain commercial equipment, components, and software may be identified in this report to specify adequately the technical aspects of the reported results. In no case does such identification imply recommendation or endorsement by the National Telecommunications and Information Administration, nor does it imply that the equipment or software identified is necessarily the best available for the particular application or uses.

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