The newly released 3.5 GHz Citizens Broadband Radio Service (CBRS) will play a significant role in the growth of new Industrial IoT use cases. CBRS is a very large swath of license–free, shared spectrum formed to promote the development of new applications. The FCC calls it an “innovation band” with the intention for it to ignite new use cases, similar to what WiFi did over 20 years ago. Compared to WiFi, however, the CBRS band access is managed, which provides interference protection even though it is license–free.
Fig. 1 below illustrates the three types of access: General Access, Priority Access and Grandfathered 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 End User Device (EUD). The SAS maintains a database of all CBSDs, their geographical location, and other pertinent information. These elements allow real-time knowledge of the spectrum being used at various locations, which helps to manage potential interference.
As required by the “device type approval” at power up, every CBSD must contact the shared Spectrum Access System (SAS) over the Internet and receive operating parameters like channel and RF power limit. The SAS provides this authorization in accordance with other CBSDs operating in the area. Once the CBSD receives the authorization from the SAS, it can then instruct the downstream EUDs to begin their operation.
Here are some of the salient technical requirements that the CBSD must satisfy –
Mesh Rider is an innovative patented long-range wireless broadband mesh technology developed by Doodle Labs (refer to the Whitepaper: Mesh Rider – An Introduction for more details). It is a state-of-the-art wireless communication technology that combines various capabilities under a single umbrella:
In particular, Mesh Rider is designed for the deployment of robust and high performance private wireless networks. It has the simplicity of WiFi and can be used and operated under enterprise control.
How does Mesh Rider Mesh compare with LTE and WiFi?
There is significant excitement and buzz in the market about the new opportunities enabled by the CBRS band. LTE vendors are investing heavily to take advantage of this license-free spectrum. WiFi is also used to deploy short range private network in license-free bands.
Doodle Labs Mesh Rider for CBRS technology provides a higher performance solution to deploy private wireless networks for applications that require high throughput, long range, and low latency. The accompanying chart shows important comparative parameters for each of the technologies.
Doodle Labs’ Mesh Rider technology has been extended to bring its capabilities to the CBRS band. RM-3625 Smart Radios are fully certified for CBRS regulatory compliance.
The CBRS Band Smart Radio is an innovative dual role device. It can be software configured for either the CBSD-A role or the EUD role to simplify network planning and execution. The RM-3625 is available in 3 different form factors (Embedded, External, and Pocketable). The Smart Radios enable organizations to deploy private wireless networks as easily as WiFi.
The FCC has authorized over 10 companies to operate the SAS. Doodle Labs has worked closely with Federated Wireless to ensure the interoperability with its SAS. The RM-3625 is pre-configured to make this a turn-key operation.
After almost 5 years of planning, the commercial CBRS deployments have just begun in Q1 2020. The industry is excited to take advantage of the opportunities presented by such a large swath of unlicensed spectrum becoming available (For comparison, CBRS is 150 MHz while 2.4 GHz WiFi is only 70 MHz wide band). There are many things to learn and many experiences to share. Here we have curated some resources that we think may be useful in your research.