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Citizens Broadband Radio Service

The newly released 3.5 GHz Citizens Broadband Radio Service(CBRS) will play a tremendous role in the growth of new IoT use cases. The FCC calls it the “Innovation Band”. The DoD maintains control of a significant amount of spectrum to be used in special circumstances. However, most of the time, this precious resource sits idle. Under the tiered shared spectrum access scheme, a large swath of 150 MHz is now available for general access

The key elements of the 3.5 GHz dynamic spectrum sharing are the cloud-based Spectrum Access System (SAS), the Citizens Broadband Radio Service Devices (CBSDs), and the Environmental Sensing Capability (ESC) units. These elements allow real-time understanding of the spectrum being used at various locations. The SAS maintains a database of all CBSDs and ESCs, including their geographical location and other pertinent information to manage potential interference. When incumbent use is detected, the ESC alerts the SAS, which then directs CBSDs utilizing impacted CBRS channels in that area to move over to other channels. As mandated by FCC, the SAS and CBSD must be certified for interoperability. Additionally, the CBSD must be certified for special rules governing the RF emissions.


Doodle Labs has developed the Smart Radio {patented} and worked with various SAS vendors to ensure interoperability of the 3.5 GHz CBSD and client devices.