Method and system for implementing a geofence boundary for a tracked asset
View Patent ↗An asset's TCU, or a mobile device coupled thereto, receives and stores geographical boundary definitions to a memory. A processor uses the boundary definition to determine an initial-location boundary based on the definition and the current location of the TCU at the time it received the boundary request message. As the TCU's GPS unit generates location information, the processor retrieves the initial-location boundary definition from the memory and compares the current location from the GPS receiver to it according to an algorithm. If the processor determines that the current location of the vehicle has crossed the boundary, the processor generates an alert message, which may be an e-mail, SMS, telephonic, interne, IM, or other electronic message indicating that an asset crossed the boundary, and sends it wirelessly using a transceiver to a central computer for further processing, or directly to another device, according to a notification destination identifier.
1. A system configured to provide a notification when an asset crosses a boundary, comprising:
a wireless transceiver configured to wirelessly receive a boundary request message requesting the establishment of an initial-location boundary relative to the location of the asset at the time the transceiver receives the boundary request message;
a processor coupled to the wireless transceiver configured to compare, subsequent to the time the transceiver received the boundary request message, an updated current location of the asset, received from a tracking application apparatus, with the established initial-location boundary;
wherein the wireless transceiver is configured to transmit a crossing notification message from a tracking application when a result of the comparing step indicates that the asset crossed the initial-location boundary;
wherein the system further comprises a telematics control unit substantially fixed to the asset and a mobile device running a geofence application, wherein the telematics control unit and the mobile device are configured to communicate control, data, information, and other signals with each other over a short range wireless link when the telematics control unit and the mobile device are within a first range of each other, the first range being the range in which the telematics control unit and the mobile device can communicate signals to each other over the short range wireless link, and wherein the mobile device includes the wireless transceiver and processor and wherein the mobile device runs the tracking application;
wherein the mobile device is configured to use location information from a GPS module internal to the mobile device when the mobile device and the telematics control unit are not within the first range of each other; and
wherein the mobile device is configured to use location information from signals other than GPS signals to determine that the mobile device has moved after a GPS module internal to the mobile device has entered a sleep mode, and to cause the GPS module internal to the mobile device to exit the sleep mode.
2. The system of claim 1 wherein the mobile device is configured to use location information from a GPS module of the telematics control unit when the mobile device and the telematics control unit are within the first range of each other.
3. The system of claim 1 wherein the crossing notification message includes at least one of an e-mail message, an SMS message, a telephonic message, an internet message, or an IM message.
4. The system of claim 1 wherein the mobile device is configured to use signals transmitted from a cellular telephony tower to determine that the mobile device has moved.
5. The system of claim 1 wherein the mobile device uses signals from an accelerometer module internal to the mobile device to determine that the mobile device has moved, and wherein the mobile device is configured to adjust the rate at which the GPS module internal to the mobile device attempts to lock to GPS signals based on a magnitude of the signal from the accelerometer module.