Telecommunications – Radiotelephone system – Zoned or cellular telephone system
Reexamination Certificate
2006-05-02
2006-05-02
Gesesse, Tilahun (Department: 2684)
Telecommunications
Radiotelephone system
Zoned or cellular telephone system
C455S412200, C455S435200, C455S525000
Reexamination Certificate
active
07039413
ABSTRACT:
While a plurality of cellular mobile communication systems have their respective service areas regionally overlapping each other in part, a mobile station is configured to perform a standby for calling or communication while selecting one of the plural systems in the overlapping areas, and is arranged as follows: the mobile station preliminarily stores cell information notified of by a base station and indicating whether the mobile station is transferable to each surrounding cell while maintaining the current system; when the arrival of transfer timing to a surrounding cell is detected, the mobile station extracts the information about the pertinent cell and judges whether the surrounding cell is a transferable cell, based on the cell information; when the surrounding cell is a transferable cell, the mobile station transfers to the surrounding cell; when the surrounding cell is not a transferable cell, the mobile station directly transfers to a cell of a different system. This makes it feasible to decrease communication down time and decrease power consumption of the mobile station.
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Maebara Akihiro
Masuda Masafumi
Nagano Takashi
Niiyama Hiromu
Yazaki Hidetoshi
Gesesse Tilahun
Lee John J.
NTT DoCoMo Inc.
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