Telecommunications – Radiotelephone system – Zoned or cellular telephone system
Reexamination Certificate
2008-08-05
2010-02-16
Edouard, Patrick N (Department: 2617)
Telecommunications
Radiotelephone system
Zoned or cellular telephone system
C455S435200
Reexamination Certificate
active
07664499
ABSTRACT:
A communication device locates a preferable wireless service provider in a multi-service provider environment using a frequency band search schedule. Initially, the communications device registers with a less preferred service provider in a first frequency band. While remaining registered with the less preferred service provider, the device examines several frequency bands in the order specified by the frequency band search schedule. A frequency band is examined by dividing the frequency band into many sub-bands, and by locating the strongest signal above a threshold within the sub-band being examined. The examination continues until a second frequency band having a more preferred service provider is located. The communication device then registers with the more preferred service provider. The category of service provider may be identified and displayed on the communication device.
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“System Selection for Preferred Roaming Stage 1 Description—Baseline Text”, Jun. 1996.
Bamburak Michael D.
Daly John J.
Lawrence Christopher Gregory
Prise Michael Edward
Raffel Michael Allen
AT&T Mobility II LLC
Edouard Patrick N
Elcenko Eric
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