Radio telephone system with base station capable of updating...

Details Radio telephone system with base station capable of updating... Radio telephone system with base station capable of updating...

2005-03-29

2005-03-29

Vo, Nguyen T. (Department: 2685)

Telecommunications

Transmitter and receiver at separate stations

Plural transmitters or receivers

C455S069000

Reexamination Certificate

active

06873855

ABSTRACT:
A radio telephone system includes a base station and a plurality of mobile stations. The base station transmits echo-back request signals to the mobile stations in turn. When the mobile station fails to transmit an echo-back response signal, the base station determines that the non-responsive mobile station is outside a radio zone of the base station, and deletes the corresponding data from a storage section thereof. Further, the base station is capable of changing its transmission power level so as to change a size of the radio zone correspondingly. Specifically, the base station monitors a range of presence of the mobile stations within the radio zone, and changes its transmission power level depending on such a range. For example, when such a range spreads over the radio zone, the base station may control its transmission power level to be maximum. On the other hand, when such a range is only around the base station, the base station may control its transmission power level to be minimum.

REFERENCES:
patent: 3925782 (1975-12-01), Anderl et al.
patent: 5153902 (1992-10-01), Buhl et al.
patent: 5257283 (1993-10-01), Gilhousen et al.
patent: 5369681 (1994-11-01), Boudreau et al.
patent: 5475863 (1995-12-01), Simpson et al.
patent: 2215238 (1990-08-01), None
patent: 03-6929 (1991-01-01), None
patent: 4200126 (1992-07-01), None
patent: 514459 (1993-01-01), None

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