Tertiary connection strategy for vehicle originated cellular communication to a call center
First Claim
1. A connection method for use by a vehicle telematics unit to establish a wireless telephone connection between the telematics unit and a call center over a GSM cellular system, comprising the steps of:
- (a) determining that a call attempted using a primary connection strategy and a secondary connection strategy has failed;
(b) detecting that the call attempted using the primary strategy and secondary strategy is permitted to revert to a voice-only call when a modem data connection cannot be established, and if so, then;
(c) selecting an available PLMN using a manual network selection mode supported by the GSM cellular system;
(d) selecting a base station within the selected PLMN;
(e) attempting to attach to the selected base station;
(f) attempting origination of a voice channel cellular connection if the telematics unit is attached to a base station; and
(g) iteratively repeating steps (c) through (f) for each available PLMN that has been recently used to place a call.
10 Assignments
0 Petitions
Accused Products
Abstract
A system and method for making vehicle originated calls to a telematics service provider or other call center. The method includes identifying a call type associated with a desired wireless communication of speech or data to the call center, and then carrying out one of a number of different call connection processes depending on the call type. For voice channel cellular connections, an in-band modem cellular connection is preferably established in most instances using a connection retry strategy that includes primary, secondary, and possibly tertiary connection attempts. The system and method can be carried out in connection with various cellular system technologies, but is especially suited for use with GSM systems.
23 Citations
11 Claims
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1. A connection method for use by a vehicle telematics unit to establish a wireless telephone connection between the telematics unit and a call center over a GSM cellular system, comprising the steps of:
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(a) determining that a call attempted using a primary connection strategy and a secondary connection strategy has failed; (b) detecting that the call attempted using the primary strategy and secondary strategy is permitted to revert to a voice-only call when a modem data connection cannot be established, and if so, then; (c) selecting an available PLMN using a manual network selection mode supported by the GSM cellular system; (d) selecting a base station within the selected PLMN; (e) attempting to attach to the selected base station; (f) attempting origination of a voice channel cellular connection if the telematics unit is attached to a base station; and (g) iteratively repeating steps (c) through (f) for each available PLMN that has been recently used to place a call. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11)
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Specification