The GeoLocation Agent within ExtremeCloud IQ provides geo-location coordinates for AP consumption. The AP5020 uses the geo-location coordinates to query the AFC server in the 6 GHz spectrum.
The following steps outline how the Geo-Location Agent derives the AP coordinates:
The APs use 802.11mc Fine Time Measurement (FTM) technology to determine the distance between two APs, referred to as AP-to-AP ranging. The GeoLocation Agent collects the ranging results and builds one or more graphs (subgraphs) of APs on the floor. The graph borders are the estimated distances between the APs.
Note
The AP3000/AP4020/AP5010/AP5020/AP5050 participate in building out AFC subgraphs on floor plans by performing FTM AP-to-AP ranging and deriving their geo-location coordinates from the Geo-Location Agent.
Anchor APs are access points equipped with GPS modules. The GeoLocation Agent collects the GPS coordinates of the anchor APs and combines them with the FTM graph to derive the geo-location coordinates. For an AP to be part of the graph, it has to have an equivalent range of at least three other APs. Anchor and non-anchor APs must be placed on the graph. A minimum of four anchor APs must provide GeoLocation coordinates in order to place the graph on the geographic map from which the geo-location coordinates of each AP can be derived.
Tip
To lock on GPS signals, install anchor APs close to the building perimeter or outdoors. The indoor anchor AP location must be chosen based on the GPS signal availability. Building properties determine the degree of shielding of the GPS signal. It is recommended to survey the GPS signal with a smart phone application such as GNSSLogger to determine the best anchor AP position.
