In the CBRS ecosystem (WINNF-TS-0016 and especially Release 2 extensions in WINNF-TS-3002 + WINNF-SSC-0010), grouping parameters (groupingParam array sent during CBSD registration) tell the SAS that multiple CBSDs belong to the same logical group.
By declaring a group, you give the SAS (or sometimes your own network) permission and context to coordinate interference within that group differently than it coordinates interference with unrelated CBSDs.
Result: Groups often receive higher total EIRP, more stable channels, or better spectrum reuse than the same CBSDs would get individually.
| Group Type | What It Tells the SAS | Practical Effect on Your Deployment |
|---|---|---|
| INTERFERENCE_COORDINATION | "These CBSDs coordinate interference among themselves." | SAS reduces intra-group protection margins → higher aggregate power allowed |
| SPECTRUM_REUSE | "These CBSDs can safely reuse the same spectrum; we manage interference ourselves." | SAS does not apply interference protection between members → full reuse possible |
| PASSIVE_DAS | "These CBSD 'ports' are antennas fed from one radio unit." | SAS treats them as a single transmitter for interference calculations → avoids self-interference penalties |
| COEXISTENCE_GROUP (CBRS Alliance CxG) | "We follow the CBRS Alliance coexistence policy (CBRSA-TS-2001)." | Advanced distributed coordination; SAS applies CxG-specific rules (often better performance in dense neutral-host) |
| PRINCIPAL_SUBORDINATE_SFG | Single Frequency Group with one principal controlling subordinates | Principal gets priority; subordinates protected accordingly |
| INTERDEPENDENT_SFG | All members must operate together on same channel | SAS allocates channel only if all can be accommodated |
| SEPARABLE_SFG | Members can operate independently but share some coordination | More flexible than interdependent |
10 rooftop CBSDs on one building, no grouping
→ SAS sees 10 independent transmitters → conservative power limits to avoid "self-interference"
→ Total EIRP heavily capped
Same 10 CBSDs declared as INTERFERENCE_COORDINATION or PASSIVE_DAS group
→ SAS knows they are coordinated → relaxes intra-group limits
→ Significantly higher total EIRP, better coverage
Multiple operators in a venue using SPECTRUM_REUSE groups
→ Each operator reuses channels within their own group without SAS penalizing them
→ More efficient neutral-host deployments
groupType and groupId.GroupConfig (Release 2) with additional configuration or hints.In short: Grouping parameters are your way to tell the SAS "these devices work together" so it can allocate spectrum more efficiently for your network without compromising overall system fairness.
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