Institute for Telecommunication Sciences
the research laboratory of the National Telecommunications and Information Administration

Institute for Telecommunication Sciences / Programs / Spectrum Monitoring / Monitoring in the 3.5 GHz CBRS Band

Monitoring in the 3.5 GHz CBRS Band

In the 3.55–3.65 GHz Citizen Broadband Radio Service (CBRS) band (called the 3.5 GHz band), Federal maritime radars will soon share spectrum with new commercial wireless systems. A thorough awareness of existing spectrum use in the band is needed so that new systems can begin operation without endangering radar functionality. To support this transition, the specmon program has been continuously collecting monitoring data in the 3.5 GHz band at locations on the coasts of the United States.

In FY 2017, we established three radar sensors near San Diego, San Francisco, and Virginia Beach. Figure 1 shows two example results obtained from a west- and east-coast sites. The two visualizations represent actual spectrum usage in the 3.5 GHz band throughout the month of August, 2017. Visualizations like these are provided to spectrum management offices on a monthly basis to provide RF awareness. In FY 2018, we plan to establish three additional radar sensors near Astoria, Boston, and the Florida Keys.

Concurrently with our radar sensor work, in FY 2017 we established the required security controls for responsible sensor connectivity, control, and backhaul of CBRS sensor data. This is an important milestone toward the goal of real-time RF awareness and automated spectrum management.


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Figure 1. Visualization of measured signal in 3.45-3.65 GHz band measured on west and east coasts in summer of 2017[CM1] .

For more information about this project, contact Linh Vu.