Method for detecting the location of a mobile terminal
First Claim
1. A method for detecting the location of a mobile terminal in a mobile radio communication system including a plurality of base stations and a plurality of mobile terminals, the method comprising the steps of:
- emitting a location inquiry signal from at least one of the base stations through a control channel which is used to transmit the location inquiry signal;
emitting a location signal from each of the mobile terminals receiving the location inquiry signal from the at least one base station, the location signal including identification information of each of the mobile terminals;
receiving the location signal from each of the mobile terminals in at least three base stations neighboring each of the mobile terminals;
calculating the respective distances from the base stations receiving the location signal of a specified mobile terminal, based on the respective field strength values detected from the received location signal, the specified mobile terminal being identified by the identification information included in the location signal; and
calculating the location of the specified mobile terminal among the base stations receiving the location signal of the specified mobile terminal, based on the respective distances from the base stations receiving the location signal to the specified mobile terminal.
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Accused Products
Abstract
In location detection of a mobile terminal, a location inquiry signal is transmitted from one or more base stations to the mobile terminal at predetermined intervals. In response to the location inquiry signal, the mobile terminal transmits a location signal including its identification information such as a telephone number. The location signal is received by at least three base stations neighboring to the mobile terminal. The respective distances from that base stations to the mobile terminal are calculated based on the respective field strength values of the location signal received by the base stations, and the location of the mobile terminal is detected based on the calculated distances. More specifically, the location is calculated as an intersection of the respective circles defined by radiuses of the calculated distances from the base stations receiving the location signal.
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Citations
8 Claims
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1. A method for detecting the location of a mobile terminal in a mobile radio communication system including a plurality of base stations and a plurality of mobile terminals, the method comprising the steps of:
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emitting a location inquiry signal from at least one of the base stations through a control channel which is used to transmit the location inquiry signal; emitting a location signal from each of the mobile terminals receiving the location inquiry signal from the at least one base station, the location signal including identification information of each of the mobile terminals; receiving the location signal from each of the mobile terminals in at least three base stations neighboring each of the mobile terminals; calculating the respective distances from the base stations receiving the location signal of a specified mobile terminal, based on the respective field strength values detected from the received location signal, the specified mobile terminal being identified by the identification information included in the location signal; and calculating the location of the specified mobile terminal among the base stations receiving the location signal of the specified mobile terminal, based on the respective distances from the base stations receiving the location signal to the specified mobile terminal. - View Dependent Claims (2, 3, 4)
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5. A method for detecting the location of a mobile terminal in a mobile radio communication system including a plurality of base stations and a plurality of mobile terminals, the method comprising the steps of:
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emitting a location inquiry signal from at least one of the base stations at predetermined intervals through a control channel which is used to transmit the location inquiry signal; emitting a location signal from each of the mobile terminals receiving the location inquiry signal from the at least one base station, the location signal including identification information of each of the mobile terminals; receiving a location signal from each of the mobile terminals in at least three base stations neighboring each of the mobile terminals; calculating the respective distances from the base stations receiving the location signal to a specified mobile terminal, based on the respective field strength values detected from the received location signal at the predetermined intervals, the specified mobile terminal being identified based on the identification information included in the location signal; calculating the location of the specified mobile terminal among the base stations receiving the location signal of the specified mobile terminal, based on the respective distances from the base stations receiving the location signal to the specified mobile terminal at the predetermined intervals; and storing the locations of the specified mobile terminal at the predetermined intervals. - View Dependent Claims (6, 7, 8)
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Specification