Telecommunications – Radiotelephone system – Zoned or cellular telephone system
Reexamination Certificate
2008-03-18
2008-03-18
Vuong, Quochien B. (Department: 2618)
Telecommunications
Radiotelephone system
Zoned or cellular telephone system
C455S062000, C455S166200, C455S435100, C455S552100
Reexamination Certificate
active
07346350
ABSTRACT:
A communication device locates a preferable wireless service provider in a multi-service provider environment using a frequency or frequency band search schedule. Initially, the communication device registers with a less preferred service provider in a first frequency. While remaining registered with the less preferred service provider, the device examines several frequencies in the order specified by the frequency search schedule. The device determines whether the last frequency used by the communication device has a more preferred service provider. If the last frequency used does not have a more preferred service provider, the device examines each of the plurality of frequencies in the predetermined order in the search schedule. The examination continues until another frequency band having a more preferred service provider is located. The communication device then registers with the more preferred service provider.
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Bamburak Michael D.
Daly John J.
Lawrence Christopher G.
Prise Michael E.
Raffel Michael A.
AT&T Mobility LLC
Davis , Wright, Tremaine, LLP
Donohue Michael J.
Vuong Quochien B.
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