Citizen’s Broadband Radio Service (CBRS)
2.5x more open spectrum than WiFi
New Innovation Band
A New License Free Band Available Now
Interference Free
Cellular Network Like Topology
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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.

CBRS Anatomy

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.

Scalable Network Architecture

Cellular Network like Architecture

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.

Smart Radio for CBRS

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.

FCC Certified

Fully certified with all regulatory certifications

GA and PAL Access

Supports both General Access and Priority Access licenses

SAS Integration

Fully integrated with the SAS for a Plug and Play operation

Device Portfolio

Full portfolio of Short Range and Rural Gateways and End User devices

Technical Specifications (RM-3625)

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

Summary of Technical Specifications (RM-3625)

MODEL CATEGORY
CBSD-A or EUD, Dual Roles
Ordering Codes
RM-3625-2J-XM (Embedded)
RM-3625-2J-XE (External)
RM-3625-2J-XP (Pocketable)
Evaluation KitEK-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 Configuration2×2 MIMO
Frequency Range3550-3700 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
NETWORKING SPECIFICATIONS
Command & Control channelUltra-Reliable Low Latency Channel (URLLC) for Command and Control data. Latency 30 ms (Typical)
Video ChannelOptimized HD video streaming channel
Mesh Automatic Transmit Power Control
(M-ATPC)
Intelligently adjusts the transmit output power based on signal strength. Allows the Smart Radios to be utilized in a widely dispersed and dynamic mesh.
MulticastHigh Rate
HARDWARE SPECIFICATIONS
Operating Voltage5.5~42V DC
I/O InterfacesEmbedded: 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
DimensionsEmbedded: 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 ProtectionEmbedded: 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
REGULATORY SPECIFICATIONS
FCC ID2AG87RM-3625 (In Progress)

* Specifications are subject to change without prior notice.

CBRS Use Cases

Warehouse Automation

Low latency, High throughput Private Wireless Network for Autonomous Robots

Airport connectivity_Pancake
Private Wireless for Ports

Improve productivity with video collaboration for field operations at the Ports

Private Wireless for Greenfields

Improve productivity on locations without any communication infrastructure.

Doctors using Tablets
Private Wireless for Healthcare

Avoid the overcrowded hospital WiFi and run mission critical applications on Private Wireless Network

Design-In Documents

Doodle Labs provides an extensive set of documents and support to simplify integration of the Smart Radio. Please visit our Smart Radio Technical Library for more information.

Additional Industry Resources

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.

  1. An Overview of the Citizens Broadband Radio Service – Video Tutorial by Commscope (25 minutes)
  2. FCC’s Part 96 governing the use of CBRS band. For most users, the Subparts C and D are most relevant.
  3. CBRS Baseline Specifications Overview – A webinar explaining the details of the CBRS specifications. Wireless Innovation Forum.
  4. CBRS Standards committee – The Spectrum Sharing Committee (SSC) serves as a common industry and government standards body supporting the development and advancement of CBRS spectrum sharing technologies.

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