Geofence

A Geofence defines a virtual perimeter for a real-world geographical area, such as a point location, a specific structure, a neighborhood, a city, and so on.  When a radio capable of GPS (Global Positioning System) functionality reports its location to the Fixed Network Equipment (FNE), where a pre-defined Geofence has been configured, the FNE is then aware that the radio has entered or exited the Geofence and may use that information to perform certain functions, such as sending a TMS (Text Messaging Service) notification to the radio, or triggering a Dynamic Regrouping change in the radio (see Geofence Mode). The radio uses a protocol called LRRP (Location Request / Response Protocol) to send GPS updates to the FNE (typically a Location Server); the FNE in turn sends location request information to the radio that determines certain conditions, such as time duration or distance travelled, which the radio stores; when one of the triggers has been reached, the radio send its current location to FNE; for example, the radio may be set to send GPS data every ten minutes, or every kilometer travelled, whichever occurs first.