Primary 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 if the telematics unit is currently attached to a base station of a registered public land mobile network (PLMN) and, if not, executing an idle mode process involving cell reselection and attempting to attach to a base station following cell reselection;
(b) attempting origination of an in-band modem cellular call if the telematics unit is attached to a base station; and
(c) if the origination attempt fails, then carrying out steps (a) and (b) for one or more neighboring base stations using a broadcast control channel (BCCH) Allocation list.
2 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.
18 Citations
9 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 if the telematics unit is currently attached to a base station of a registered public land mobile network (PLMN) and, if not, executing an idle mode process involving cell reselection and attempting to attach to a base station following cell reselection; (b) attempting origination of an in-band modem cellular call if the telematics unit is attached to a base station; and (c) if the origination attempt fails, then carrying out steps (a) and (b) for one or more neighboring base stations using a broadcast control channel (BCCH) Allocation list. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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Specification