Pulse or digital communications – Spread spectrum
Reexamination Certificate
2007-12-11
2007-12-11
Tran, Khanh (Department: 2611)
Pulse or digital communications
Spread spectrum
C455S436000
Reexamination Certificate
active
10312086
ABSTRACT:
To decrease the number of base stations transmitting when a mobile station is connected to a plurality of base stations during handover and to let a base station having the best reception quality perform transmission so as to decrease interference in downlink and increase the link capacity. A mobile station periodically measures a pilot signal transmitted from a base station in a reception monitor406and estimates its own movement speed at predetermined intervals based upon the reception electric field strength of the pilot signal in a speed estimate device407in soft handover state. A time length for measuring the pilot signal transmitted from the base station corresponding to the movement speed and an inner threshold value for deciding transmission base stations during handover are altered in a control section408. In this case, when the movement speed is slow, the pilot signal measurement time length is set short, and the inner threshold value is set small, and when the movement speed is fast, the pilot signal measurement time length is set long, and the inner threshold value is set large.
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Hamabe Kojiro
Takano Nahoko
Foley & Lardner LLP
NEC Corporation
Tran Khanh
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