VOICE CHANNEL DATA CONNECTION RETRY STRATEGY
First Claim
1. A connection retry method for use by a vehicle telematics unit to establish a wireless telephone connection between the telematics unit and a call center, comprising the steps of:
- carrying out a primary connection attempt between the telematics unit and the call center using an attached base station;
determining whether the primary connection attempt was successful and, if not, then carrying out a secondary connection attempt in which the telematics unit attempts to connect to the call center via one or more of the PLMNs that have been previously successfully used to place calls by the telematics unit; and
determining whether the secondary connection attempt was successful and, if not, then carrying out a tertiary connection attempt in which the telematics unit attempts to connect to the call center via any of a number of available base stations with which the telematics unit is able to communicate.
14 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 retry method for use by a vehicle telematics unit to establish a wireless telephone connection between the telematics unit and a call center, comprising the steps of:
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carrying out a primary connection attempt between the telematics unit and the call center using an attached base station; determining whether the primary connection attempt was successful and, if not, then carrying out a secondary connection attempt in which the telematics unit attempts to connect to the call center via one or more of the PLMNs that have been previously successfully used to place calls by the telematics unit; and determining whether the secondary connection attempt was successful and, if not, then carrying out a tertiary connection attempt in which the telematics unit attempts to connect to the call center via any of a number of available base stations with which the telematics unit is able to communicate. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
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11. A connection retry 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) carrying out a primary connection attempt between the telematics unit and the call center using the following steps; (a1) determining if the telematics unit is currently attached to a base station of a registered PLMN and, if not, executing an idle mode process involving cell reselection and attempting to attach to a base station following cell reselection; (a2) attempting origination of an in-band modem cellular call if the telematics unit is attached to a base station; and (a3) if the origination attempt fails, then carrying out steps (a1) and (a2) for one or more neighboring base stations using a BCCH Allocation list; (b) determining whether the primary connection attempt was successful and, if not, then carrying out a secondary connection attempt between the telematics unit and call center using the following steps; (b1) accessing a list of most recently attached PLMNs stored on the vehicle; (b2) selecting a PLMN from the list; (b3) selecting a base station within the selected PLMN; (b4) attempting to attach to the selected base station and, if not successful, attempting to attach to another base station identified on a BCCH Allocation list for the selected base station; (b5) attempting origination of an in-band modem cellular call if the telematics unit is attached to a base station; and (b6) iteratively repeating steps (b2) through (b5) for each of the other PLMNs on the list until either a successful origination is made or until origination via a base station has been unsuccessfully attempted on all PLMNs on the list; (c) determining whether the secondary connection attempt was successful and, if not, then carrying out a tertiary connection attempt between the telematics unit and call center using the following steps; (c1) selecting an available PLMN using a manual network selection mode supported by the GSM cellular system; (c2) selecting a base station within the selected PLMN; (c3) attempting to attach to the selected base station and, if not successful, attempting to attach to another base station identified on a BCCH Allocation list for the selected base station; (c4) attempting origination of an in-band modem cellular call if the telematics unit is attached to a base station; and (c5) iteratively repeating steps (c1) through (c4) for each available PLMN; and (d) determining if origination of the in-band modem cellular call was successful and, if not, then originating a voice channel cellular connection for communication of speech between the telematics unit and call center.
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Specification