GeoLocation Coordinates

The GeoLocation Agent builds one or more AP graphs (subgraphs) for each floor plan to which APs are assigned, based on the FTM AP-to-AP ranging results. The graph boundaries are created from the measured distance between the APs, using the 802.11mc protocol. Where the AP graph is located on the map depends on the GeoLocation reported by the anchor APs.

Note

For APs that are eligible for use in an AFC indoor configuration (AP3000/AP4020/AP5010/AP5020/AP5050), do not use the 5 GHz radio for MESH connection, since this radio is reserved for performing FTM AP-to-AP ranging.

The following conditions must be met before the GeoLocation Agent can derive coordinates for APs on the floor:

• AP graph connectivity: Each AP on the floor must be able to determine the FTM distance to a minimum of three neighboring APs.

  If the AP graph connectivity requirement is not met for all the APs on the floor, the GeoLocation Agent creates several subgraphs. Each subgraph includes a subgroup of APs.

• Number of anchor APs: The AP graph must be connected to a minimum of four anchor APs, with multiple subgraphs per floor supported.

The APs belonging to subgraphs might have geo-location coordinates assigned. See the following scenarios and recommendations for corrective actions.

Example Subgraph Scenarios

Subgraph 1

The group of APs belonging to Subgraph 1 satisfy the AP graph connectivity and the number of anchor AP requirements. As a result, the geolocation agent derived coordinates for each of them.

No corrective action required.

Subgraph 2

The group of APs belonging to Subgraph 2 satisfy the AP graph connectivity rules, but not the number of anchor AP requirements. As a result, the geolocation agent did not derive coordinates for these APs.

Corrective action: Install more APs between Subgraph 1 and Subgraph 2 to add more connections between the subgraphs and merge them.

Subgraph 3

When the AP graph connectivity rule is not met, but the number of anchor APs requirement is met, geolocation coordinates are not derived.

Corrective action: Reposition the APs, or install more APs, to achieve connectivity with the rest of the APs on the floor.

Subgraph 4

When neither requirement is met, geo-location coordinates are not derived. Take the following corrective actions:

Corrective action: Reposition the APs or install more APs to achieve connectivity with the rest of the APs on the floor.