System and method for improving telematic location information and reliability of EP11 calls

A system for providing wireless telematics device location information to an access point during an emergency call, the system comprising at least one data processor, memory coupled to the at least one data processor, and at least one program including instructions for:

• establishing a voice channel to an access point in response to a telematics device initiating an emergency call via a wireless network;
• receiving location information generated at the telematics device, the location information including recent position coordinates;
• determining if the telematics device can provide tracking information;
• post-processing the position coordinates with a map database to obtain an estimated location of the telematics device;
• generating at least one of an audio message and a text phone message that comprises the telematics device location information;
• and
• transmitting the at least one of an audio message and a text phone message to the access point on the voice channel;
• wherein the determining if the telematics device can provide tracking information includes determining, whether data transmitted by the telematics device indicates that predefined handling of tracking information is required, the data including (i) a flag or data field set in a control channel message or (ii) a callback number that falls within a preset range of callback numbers, wherein the tracking information comprises dead reckoning information that includes a series of coordinates representing points along a path, vector, or trajectory of the telematics device, and wherein the processing of the position coordinates with a map database includes comparing the series of coordinates in the dead reckoning information with data in the map database so as to determine a last trajectory coordinate of the telematics device reverse geocoded to a nearest street or geographic location that is proximate to the telematics device.

A system for providing wireless telematics device location information to an access point, the system comprising at least one data processor, memory coupled to the at least one data processor, and at least one program including instructions for:

• receiving location information generated at a telematics device comprising tracking information including at least one previous position coordinate;
• determining an estimated location of the telematics device by post-processing the tracking information, including processing the at least one previous position-coordinate with a map database;
• determining if the telematics device can provide tracking information by determining whether data transmitted by the telematics device indicates that predefined handling of tracking information is required, the data including (i) a flag or data field set in a control channel message or (ii) a callback number that falls within a preset range of callback numbers, wherein the at least one previous position coordinate is included in dead reckoning information that comprises a series of coordinates representing points along a path, vector, or trajectory of the telematics device, and wherein the processing of the at least one previous position coordinate with a map database includes comparing the series of coordinates in the dead reckoning information with data in the map database so as to determine a last trajectory coordinate of the telematics device reverse geocoded to a nearest street or geographic location that is proximate to the telematics device;
• and
• performing at least one of:
• (i) transmitting the estimated location of the telematics device to the access point on both a data channel and a voice channel;
• or
• (ii) transmitting the estimated location of the telematics device to the telematics device and routing a voice call from the telematics device to the access point.