This guide only applies to Citizens Broadband Radio Service (CBRS) models, which operate in the 3550-3700 MHz CBRS frequency band. See our RM-3625-2J-X datasheet for more information on CBRS.
CBRS devices are broadly grouped into CBSDs (Citizens Broadband Service Device) and EUDs (End User Device). CBSDs must maintain a connection to a Spectrum Access System (SAS) over the internet, and must provide their GPS coordinates along with other important information to the SAS. Our radios are tested with Google SAS. More information is available here.
CBSDs are categorized as Class A or Class B. Class A CBSDs are designed for shorter-range deployments with limitations on the maximum EIRP and antenna height, while Class B CBSDs technically support much greater range through higher EIRP and height limits, but must be installed by a Certified Professional Installer (CPI). CPI certification can be obtained through Google. A full set of CBRS regulations is detailed here.
Note that Class A devices which are not installed by a CPI must include an internal GPS to send the CBSD's location to the SAS.
Doodle Labs CBRS Mesh Rider Radios support simple star networks with a CBSD acting as an Access Point (AP), and many EUDs acting as clients (Fig. 1). In addition, we support a mesh mode where several CBSDs can be chained together over a mesh backbone, each serving multiple EUDs.
Set up your hardware as in Fig. 3. See our Embedded and Wearable Design-in-Docs pages for information on how to power and hook-up the radios.
This guide is based on the October 2022 CBRS release. The latest firmware is available in the design-in-docs pages discussed above.
In this guide, we will connect to the Google Test SAS (see CBRS Connection to the Production Google SAS for information on how to connect to the Production Google SAS). The Google Test SAS cannot be used in a real deployment, and the SAS is not available at the following times:
7:00 AM - 8:30 AM UTC
3:00 PM - 4:30 PM UTC
11:00 PM - 12:30 AM UTC
If you have set up the hardware correctly, Radio1 should have received an IP address from your router (in addition to it's default IP address). Check that you can ping a site on the internet using the diagnostics tools in the Network Configuration -> Diagnostics page.
If the device has GPS, you can make sure it has a valid GPS location at the bottom of the Status -> Overview page. If it does not, you will need to be a CPI to manually enter GPS coordinates.
An example CBSD-A configuration is shown in Fig. 5. Note that in order to be able to configure the CBSD, you will need either an account with Google SAS for a real-world deployment or you will need to obtain test certificates from your SAS provider for lab testing (e.g. Google test SAS).
The settings above are just an example. If you are a CBRS CPI, then you can upload your CPI certificates and include your CPI information here too.
You can verify that the CBSD is ready by navigating to the bottom of the Status -> Overview page.
The AP starts with an SSID wireles-hotspot and password DoodleSmartRadio. You can change these in the Network-Configuration -> wireless menu.
Once the EUD is connected, you should see an association in the Network-Configuration -> wireless menu.
Ultimately PC2 needs a connection to the internet. If your router runs a DHCP server, then you should now change PC2's IP addressing mode to DHCP client. Radio1 and Radio2 each operate in DHCP client mode in addition to have a static IP address. Therefore, you can login to your router to see the dynamic IP addresses which were assigned to Radio1 and Radio2.
If you are experiencing problems with your configuration, you can either look at our troubleshooting pages or contact us for Technical Support.