TERTIARY CONNECTION STRATEGY FOR VEHICLE ORIGINATED CELLULAR COMMUNICATION TO A CALL CENTER

• US 20100167745A1
• Filed: 12/29/2008
• Published: 07/01/2010
• Est. Priority Date: 12/29/2008
• Status: Active Grant

• Current Assignee: General Motors LLC (General Motors Company)
• Original Assignee: General Motors Corporation (Motors Liquidation Co. GUC Trust)
• Inventors: Madhavan, Sethu K., Yi, Ki Hak
• Granted Patent: US 8,676,199 B2
• Time in Patent Office: Days
• US Class Current: 455/445
• CPC Class Codes: H04W 48/18 Selecting a network or a communication service
• CPC Class Codes: H04W 8/183 Processing at user equipment or user record carrier

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.

Claims

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) selecting an available PLMN using a manual network selection mode supported by the GSM cellular system;

(b) selecting a base station within the selected PLMN;

(c) attempting to attach to the selected base station;

(d) attempting origination of a voice channel cellular connection if the telematics unit is attached to a base station; and

(e) iteratively repeating steps (a) through (d) for each available PLMN.

2. A connection method as defined in claim 1, wherein step (a) further comprises determining all available PLMNs and then attempting to select from among the available PLMNs in a pre-established order.

3. A connection method as defined in claim 2, wherein step (a) further comprises attempting to attach to available PLMNs using the manual network selection mode, in the following order:

i) a PLMN listed in an MRA list;

ii) a home PLMN associated with the telematics unit;

iii) other identified PLMNs; and

iv) a PLMN listed in a forbidden PLMN list or a forbidden LAI list if no other PLMN is found.

4. A connection method as defined in claim 3, wherein the other identified PLMNs comprise a PLMN on a user controlled or operator controlled selector list.

5. A connection method as defined in claim 2, wherein the telematics unit has associated therewith a home PLMN selector and access technologies in the home PLMN selector, and wherein step (a) further comprises determining all available PLMNs by scanning all bands supported by the access technologies in the home PLMN selector.

6. A connection method as defined in claim 1, wherein step (c) further comprises attempting to attach to the base stations using an idle mode process.

7. A connection method as defined in claim 1, further comprising the steps of:

receiving a PLMN change event interrupt;

carrying out a PLMN reselection process based on the interrupt; and

attaching to a base station following PLMN reselection.

8. A connection method as defined in claim 7, wherein the step of carrying out a PLMN reselection process further comprises the step of executing an idle mode process involving PLMN reselection.

9. A connection method as defined in claim 1, further comprising carrying out steps (a) through (e) as a part of a voice fallback connection attempt.

10. A connection method as defined in claim 1, wherein, in step (c), if attaching to the selected base station is not successful, then step (c) further comprises attempting to attach to another base station identified on a BCCH Allocation list for the selected base station.

11. A connection method as defined in claim 1, wherein step (d) further comprises attempting origination of the voice channel cellular connection as an in-band modem cellular call.