CBRS (Citizen’s Broadband Radio Service) is a very large swath of license free 3.5 GHz spectrum newly released by FCC to promote the development of new applications. The FCC calls it an “Innovation band” with the intention that it will ignite the development of new use cases, like what WiFi did over 20 years ago. Because CBRS band’s shared access is managed, it provides interference protection.
The figure shows the Point to Multi-Point Network architecture for the license free CBRS band. At power up, every CBSD (Citizens Broadband Radio Service Device) is required to contact the shared Spectrum Access System (SAS) over the Internet and receive the operating parameters like channel and the RF power limit. The SAS provides this authorization in accordance with other CBSDs operating in the area.The device category CBSD-A is defined for urban use cases and high powered CBSD-B for rural-outdoor settings will be introduced in the future.
The FCC has authorized over 10 companies to operate the SAS. Doodle Labs has worked closely with Federated Wireless to ensure the interoperability of it’s CBSD-A and pre-configure it to make this a turn-key operation. Once the CBSD receives the authorization from the SAS, it can then instruct the downstream EUD (End User Device) to begin the operation.
The CBRS topology is modeled after the cellular architecture. The SAS assigns non-overlapping/non-interfering channels to the adjacent cells. This greatly increase the ability to deploy large private networks without the worry of interference.
Doodle Labs has extended it’s patented Mesh Rider technology to bring its capabilities to the CBRS band.
The Smart Radios are an innovative dual role devices. They can be software configured for either the CBSD/Gateway role or the EUD role to simplify network planning and execution.
The Smart Radios enable organizations to deploy license free private wireless as easily as WiFi. The Smart Radios are fully certified for regulatory compliance. The Smart Radios are per-configured to work with Federated Wireless SAS to make this a truly plug-and-play operation.
For more information, please visit Smart Radio home page.
Fully certified with all regulatory certifications
Fully integrated with the SAS for a Plug and Play operation
Supports both General Access and Priority Access licenses
Full portfolio of Short Range and Rural Gateways and End User devices
3 dBi Antennas on CBSD-A and EUD, 10 dBm Fade Margin, 60% Fresnel zone clearance
17 dBi Antennas on CBSD-B on both ends, 20 dBm Fade Margin, 60% Fresnel zone clearance
|MODEL CATEGORY||CBSD-A or EUD, Dual Roles|
|Ordering Codes||RM-3625-2J-XM (Embedded)|
|Evaluation Kit||EK-3625-SR (Antennas, Cables and I/O ports to facilitate quick bench testing)|
|Operating Modes|| Dual Role – Gateway/AP (CBSD-A) and Transparent Bridge (EUD)|
|Radio Configuration||2×2 MIMO|
|Frequency Range||3550-3700 MHz|
|RF Power||27 dBm (in CBSD-A role)|
23 dBm (in EUD role)
|Max Data Throughput (UDP)|| 50 Mbps|
|Max Operating Range (Indicative)|| 3 Km (6/3 dBi antennas, 10 dBm Fade margin)|
|Wireless Data Encryption||128/256-bit AES hardware data encryption|
|Command & Control channel||Ultra-Reliable Low Latency Channel (URLLC) for Command and Control data. Latency 30 ms (Typical)|
|Video Channel||Optimized HD video streaming channel|
|Mesh Automatic Transmit Power Control|
|Intelligently adjusts the transmit output power based on signal strength. Allows the Smart Radios to be utilized in a widely dispersed and dynamic mesh.|
|Operating Voltage||5.5~42V DC|
|I/O Interfaces||Embedded: 2x Ethernet, USB (Host) or UART, GPS|
External: 2x Ethernet, 2x USB (Host), UART, 2x GPIO, GPS
Pocketable: WiFi, Bluetooth, USB (Host), USB (Device), Ethernet, UART, GPIO, GPS
|Dimensions||Embedded: 65 x 57 x 12 mm, 70 grams|
External: 148 x 137 x 58 mm, 540 grams
Pocketable: 70 x 95 x 15 mm, 150 grams
|Temperature range (Operating)||-40°C to +85°C|
|Ingress Protection||Embedded: IP50 (dust protected, no liquids)|
External: IP67 (immersion up to 1 meter under water)
Pocketable: IP63 (Spray falling up to 60° from vertical)
|Special Features||– Extended lifespan with 3 years’ planned availability|
– Extreme Reliability, IPC Class 2 standard with Class 3 options
|FCC ID||2AG87RM-3625 (In Progress)|
* Specifications are subject to change without prior notice.
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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 reference, 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.