Mobile communication system and method for registering location of a mobile terminal in the mobile communication system
First Claim
1. A mobile communication system having a plurality of base stations, each of said base stations makes a radio zone, and a mobile terminal that moves in said radio zones and registers location of said mobile terminal to a predetermined base station, wherein said mobile terminal comprises location registration means for detecting reception levels of signals from said base stations, calculating a difference between a largest reception level and a second largest reception level and registering location of said mobile terminal to a base station having transmitted a signal of said largest reception level when said difference is larger than a preset threshold value.
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Abstract
In a mobile communication system having a plurality of base stations making respective radio zones, a mobile terminal that moves in the radio zone and registers its location to the base stations, the mobile terminal comprises location registration means for detecting reception levels of signals from the base stations, calculating a difference of the largest reception level and the second reception level and registering its location to a base station that transmits the largest reception level signal if the difference is larger than a threshold value.
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Citations
19 Claims
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1. A mobile communication system having a plurality of base stations, each of said base stations makes a radio zone, and a mobile terminal that moves in said radio zones and registers location of said mobile terminal to a predetermined base station, wherein
said mobile terminal comprises location registration means for detecting reception levels of signals from said base stations, calculating a difference between a largest reception level and a second largest reception level and registering location of said mobile terminal to a base station having transmitted a signal of said largest reception level when said difference is larger than a preset threshold value.
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8. A mobile communication system having an exchange office, a plurality of base stations, each of said base stations makes a radio zone, and a mobile terminal that moves in a said radio zones, where said mobile terminal registers location of said mobile terminal to a predetermined base station and said exchange office receives location information of said mobile terminal via said predetermined base station and said exchange office confirms location of said mobile terminal, wherein
said mobile terminal comprises: -
means for receiving a plurality of signals from a plurality of base stations;
means for detecting reception levels of said signals, selecting a largest reception level and a second largest reception level from among said reception levels and generating identification information indicating a base station having transmitted a signal of said largest reception level according to selected largest reception level;
means for calculating an absolute value of a difference between said largest reception level and said second largest reception level;
means for comparing said absolute value of said difference and a preset threshold value;
storage means for storing an identifier of a base station having been registered location of said mobile terminal;
means for comparing a base station indicated by said identification information and a base station indicated by said identifier when said absolute value of said difference is larger than said threshold value where said means does not register location of said mobile terminal when said base station indicated by said identification information and said base station indicated by said identifier stored in said storage means are the same, and for registering location of a mobile terminal when said base station indicated by said identification information and said base station indicated by said identifier stored in said storage means are different, where said means does not register location of said mobile terminal when said absolute value of said difference is smaller than said threshold value; and
said exchange office comprises;
location display means having a map indicating divisions of said base stations for displaying and for displaying location of said mobile terminal in a division of said base station according to a signal from a base station having been registered location of said mobile terminal.
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9. A mobile communication system comprising a plurality of base stations, each of said base stations makes a radio zone, and a mobile terminal that moves in said radio zones and registers location of said mobile terminal to a predetermined base station, wherein
said mobile terminal comprises location registration means for detecting reception levels of signals from two base stations, calculating a difference between two reception levels and registering location of said mobile terminal to a base station having transmitted a signal of a larger reception level when said difference is larger than a preset threshold value.
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14. A method for registering location of a mobile terminal in a mobile communication system having a plurality of base stations, each of said base stations makes a radio zone, and a mobile terminal that moves in a plurality of radio zones, in said mobile terminal, comprising steps of:
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detecting a plurality of reception levels of a plurality of signals from said base stations;
selecting a largest reception level and a second largest reception level from among detected reception levels;
calculating a difference between said largest reception level and said second largest reception level; and
registering location of said mobile terminal to a base station having transmitted a signal of said largest reception level when said difference is lager than a preset threshold value.
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Specification