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This document helps you understand the channel guidance for a Citizens Broadband Radio Service Device (CBSD)
in your network.
Channel quality and ranking vary based on a CBSD's frequency
management group. Spectrum Access System (SAS) automatically assigns frequency
management groups to all CBSDs unless the CBSD
provides this information in the registration request. To optimize channel
guidance information, you can use the Google SAS Portal to
adjust frequency management groups.
SAS pre-populates values for your CBSDs every day:
The Same Frequency Group (SFG)
is based on the best server available, azimuth, and on the channels that the CBSD uses.
To make sure that the pre-populated values match your network configuration,
review the SFG and the FRG on the CBSD's Config tab.
To optimize channel guidance, assign frequency management groups as follows:
Assign an SFG to each CBSD that must use the same channel.
Assign an FRG to CBSDs that don't cause interference issues
with each other when they share a channel.
After you confirm your frequency management groups, review the recommended
channels on the CBSD's Config tab. You might have to wait up
to four hours to view the updated results.
Update frequency management groups
To update frequency management groups, follow these steps:
Select the CBSD. On the right, the CBSD page opens.
On the Config tab, click the Frequency managementexpand_moredrop-down.
For the Same freq and Freq. reuse fields, enter the group. You can assign
a maximum of one SFG to a CBSD at a time
and multiple FRGs to the same CBSD.
Overrides
Some CBSDs are configured to send SFG and FRG information to
SAS. When the CBSD provides grouping parameters
information like this, it overrides information saved in the SAS
Portal.
You can change the frequency management group settings in the SAS Portal, but the
CBSD might reset those values if it's programmed to do so. For
more details, check with your CBSD vendor.
[[["Easy to understand","easyToUnderstand","thumb-up"],["Solved my problem","solvedMyProblem","thumb-up"],["Other","otherUp","thumb-up"]],[["Hard to understand","hardToUnderstand","thumb-down"],["Incorrect information or sample code","incorrectInformationOrSampleCode","thumb-down"],["Missing the information/samples I need","missingTheInformationSamplesINeed","thumb-down"],["Other","otherDown","thumb-down"]],["Last updated 2025-08-25 UTC."],[],[],null,["# Optimize channel guidance\n\nThis document helps you understand the channel guidance for a Citizens Broadband Radio Service Device (CBSD)\nin your network.\n\nChannel quality and ranking vary based on a CBSD's frequency\nmanagement group. Spectrum Access System (SAS) automatically assigns frequency\nmanagement groups to all CBSDs unless the CBSD\nprovides this information in the registration request. To optimize channel\nguidance information, you can use the Google SAS Portal to\nadjust frequency management groups.\n\nSAS pre-populates values for your CBSDs every day:\n\n- The [Same Frequency Group (SFG)](/spectrum-access-system/docs/key-terms#sfg) is based on the best server available, azimuth, and on the channels that the CBSD uses.\n- The [Frequency Reuse Group (FRG)](/spectrum-access-system/docs/key-terms#frg) is based on the channels that the CBSD uses and on [user IDs](/spectrum-access-system/docs/key-terms#userid).\n\nTo make sure that the pre-populated values match your network configuration,\nreview the SFG and the FRG on the CBSD's **Config** tab.\n\nTo optimize channel guidance, assign frequency management groups as follows:\n\n- Assign an SFG to each CBSD that must use the same channel.\n- Assign an FRG to CBSDs that don't cause interference issues with each other when they share a channel.\n\nAfter you confirm your frequency management groups, review the recommended\nchannels on the CBSD's **Config** tab. You might have to wait up\nto four hours to view the updated results.\n\nUpdate frequency management groups\n----------------------------------\n\nTo update frequency management groups, follow these steps:\n\n1. Go to the [SAS Portal](https://wirelessconnectivity.google.com/sas/).\n2. Click **View deployments**.\n3. Select the deployment, and then click **Open**.\n4. To change group information, do the following:\n - For an existing CBSD, [find your CBSD configurations](/spectrum-access-system/docs/cbsd/review-configuration).\n - For a new CBSD, [create a new CBSD configuration](/spectrum-access-system/docs/cbsd/configure) and save it as **Ready for CPI**.\n5. Select the CBSD. On the right, the CBSD page opens.\n6. On the **Config** tab, click the **Frequency management** *expand_more*drop-down.\n7. For the **Same freq** and **Freq. reuse** fields, enter the group. You can assign a maximum of one SFG to a CBSD at a time and multiple FRGs to the same CBSD.\n\n| **Tip:** You can import CBSDs to specify SFG and FRG names. In the CSV template, use the CCG column for the SFG and the ICG column for the FRG.\n\nOverrides\n---------\n\nSome CBSDs are configured to send SFG and FRG information to\nSAS. When the CBSD provides grouping parameters\ninformation like this, it overrides information saved in the SAS\nPortal.\n\nYou can change the frequency management group settings in the SAS Portal, but the\nCBSD might reset those values if it's programmed to do so. For\nmore details, check with your CBSD vendor.\n\nWhat's next\n-----------\n\n- [Choose the best channels for a CBSD](/spectrum-access-system/docs/cbsd/channels).\n- Learn about [Spectrum Access System](/spectrum-access-system/docs/overview).\n- Learn about [key SAS terms](/spectrum-access-system/docs/key-terms).\n- [Troubleshoot SAS issues](/spectrum-access-system/docs/troubleshooting)."]]
