Method of communicating voice and data transmissions for telematics applications

摘要

A method of establishing an alternate communication channel between a telematics unit and a central facility that includes determining that a vehicle telematics unit is unable to communicate data over a voice call using a voice channel; initiating a data call from the vehicle telematics unit to a central facility based on that determination; sending information identifying the vehicle telematics unit to the central facility over the data call; establishing a voice call from the central facility to verbally communicate with the vehicle telematics unit based on the information identifying the vehicle telematics unit; and communicating data between the central facility and vehicle telematics unit via short messaging services (SMS) messages using the voice call from the central facility.

主权项

1. A method of establishing an alternate communication channel between a telematics unit and a central facility, comprising the steps of:
(a) determining that a central facility is unable to send data to or receive data from a vehicle telematics unit over a voice call using a voice channel; (b) sending an instruction from the central facility to the vehicle telematics unit alerting the vehicle telematics unit that the voice channel of the voice call is operating at a data rate below a predetermined threshold; (c) receiving a voice call at the central facility placed from the vehicle telematics unit based on the determination of step (a); (d) receiving Dual Tone Multiple Frequency (DTMF) cellular commands that communicate the identity of the vehicle telematics unit to the central facility over the voice call received in step (c); and (e) communicating data between the central facility and vehicle telematics unit via short messaging services (SMS) messages using the voice call received in step (c).