INTER-COUNTRY PLMN RESELECTION FOR A VEHICLE TELEMATICS UNIT
First Claim
1. An inter-country PLMN reselection method for use with a vehicle telematics unit, comprising the steps of:
- (a) carrying out a cellular network reselection process in an attempt to attach to a base station on a cellular network that is more preferred than a current cellular network to which the telematics unit is attached;
(b) maintaining the registration of the telematics unit on the current cellular network if no more preferred cellular network was found in step (a); and
(c) if there is an available cellular network that is more preferred than the current cellular network, then attaching to a base station of the more preferred cellular network.
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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. Cell selection can be carried out using an acquisition task, background scan and inter-country PLMN reselection process that are used to select among available PLMNs and base stations. 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
14 Claims
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1. An inter-country PLMN reselection method for use with a vehicle telematics unit, comprising the steps of:
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(a) carrying out a cellular network reselection process in an attempt to attach to a base station on a cellular network that is more preferred than a current cellular network to which the telematics unit is attached; (b) maintaining the registration of the telematics unit on the current cellular network if no more preferred cellular network was found in step (a); and (c) if there is an available cellular network that is more preferred than the current cellular network, then attaching to a base station of the more preferred cellular network. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13)
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14. An inter-country PLMN reselection method for use with a vehicle telematics unit, comprising the steps of:
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(a) providing a first cellular network reselection process that attempts to find a cellular network that is more preferred than a current cellular network on which the telematics unit is registered, and that has a mobile country code that is the same as the current cellular network; (b) providing a second cellular network reselection process that attempts to find a cellular network that is more preferred than the current cellular network regardless of the mobile country code associated with the more preferred cellular network; and (c) carrying out either the first or second network reselection process based at least in part on whether there is an available base station in the current cellular network.
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Specification