Method and system for efficiently using a mobile unit for...

Details Method and system for efficiently using a mobile unit for... Method and system for efficiently using a mobile unit for...

2005-05-03

2005-05-03

Corsaro, Nick (Department: 2684)

Telecommunications

Radiotelephone system

Zoned or cellular telephone system

C455S432300, C455S435100, C455S434000

Reexamination Certificate

active

06889049

ABSTRACT:
The invention provides a method and apparatus for allowing a multi-mode mobile communication unit (102) to switch efficiently between communication systems. The method includes creating and adaptively updating a footprint database (210) relating the coverage of the multiple communication systems. The footprint database (210) comprises a plurality of system lists (220). The system lists (220) each include a plurality of cell entries (222) linking cells of a particular system to cells in other systems. Each of the plurality of cell entries is identified by a cell frequency (342) and a color code (344). The method further comprises the step of installing and dynamically updating the footprint database (210) on the mobile unit (102). Accordingly, an apparatus of the invention includes a mobile unit (102) having the aforementioned database installed thereon. The mobile unit (102) additionally includes processing tools (212) for accessing a user selected system list upon receiving a user request and for locating the selected system by cycling through cell entries in the system lists.

REFERENCES:
patent: 5666650 (1997-09-01), Turcotte et al.
patent: 5903832 (1999-05-01), Seppanen et al.
patent: 6285874 (2001-09-01), Magnusson et al.

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