Mobile telephone location system
First Claim
1. A mobile radio telephone terminal capable of communicating with another telephone terminal through a selected base station, the mobile radio telephone terminal comprising:
- first detection means for detecting a distance between said mobile radio telephone terminal and said selected base station sending a first signal to said mobile radio telephone terminal;
second detection means for detecting a direction of said selected base station as seen from said mobile radio telephone terminal;
display means for displaying the distance and the direction;
control means for controlling a direction of an antenna in accordance with an electric field strength of the first signal to obtain a maximum gain;
transmitting means for transmitting a second signal to said selected base station;
receiving means for receiving a third signal transmitted from said base station in response to the second signal; and
measuring means for measuring a time period from the transmission of the second signal to the reception of the third signal;
wherein said first detection means detects the distance on the basis of the time period measured by said measuring means, and the second signal is a position registration request signal requesting a registration of the position of said mobile telephone terminal.
1 Assignment
0 Petitions
Accused Products
Abstract
In response to a position registration request transmitted from a mobile telephone terminal 1a (or 1b), at least one base station 2l (or 2N) selected by the mobile telephone terminal transmits a response signal to the mobile telephone terminal which measures a receiving electric field strength of the received response signal and a time between the transmission of the position registration request and the reception of the response signal. The mobile telephone terminal calculates a distance between it and the base station and a direction to the base station on the basis of the measured electric field strength and the measured time and displays the results of calculation. The mobile telephone terminal reports the results of calculation to a central controller 4 through the base station and a control station 3 to store it in a portion of a subscriber information memory 5 corresponding thereto. The central controller 4 reads out a stored information from the subscriber information memory 5 in response to a notice request from the fixed telephone terminal 6 and notifies it to the fixed telephone terminal 6 to display it on a display device of the latter.
53 Citations
42 Claims
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1. A mobile radio telephone terminal capable of communicating with another telephone terminal through a selected base station, the mobile radio telephone terminal comprising:
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first detection means for detecting a distance between said mobile radio telephone terminal and said selected base station sending a first signal to said mobile radio telephone terminal; second detection means for detecting a direction of said selected base station as seen from said mobile radio telephone terminal; display means for displaying the distance and the direction; control means for controlling a direction of an antenna in accordance with an electric field strength of the first signal to obtain a maximum gain; transmitting means for transmitting a second signal to said selected base station; receiving means for receiving a third signal transmitted from said base station in response to the second signal; and measuring means for measuring a time period from the transmission of the second signal to the reception of the third signal; wherein said first detection means detects the distance on the basis of the time period measured by said measuring means, and the second signal is a position registration request signal requesting a registration of the position of said mobile telephone terminal. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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8. A mobile radio telephone system in which an available service area is constituted with radio zones of a plurality of base stations and a mobile telephone terminal selects at least one base station and communicates with a fixed telephone terminal through the selected base station, said mobile telephone terminal comprising:
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first detection means for detecting a distance between said mobile radio telephone terminal and said selected base station sending a first signal to said mobile radio telephone terminal; second detection means for detecting a direction of said selected base station as seen from said mobile radio telephone terminal; display means for displaying the distance and the direction; control means for controlling a direction of an antenna in accordance with an electric field strength of the first signal to obtain a maximum gain; transmitting means for transmitting a second signal to said selected base station; receiving means for receiving a third signal transmitted from said base station in response to the second signal; and measuring means for measuring a time period from the transmission of the second signal to the reception of the third signal, wherein said first detection means detects the distance on the basis of the time period measured by said measuring means, and the second signal is a position registration request signal requesting a registration of the position of said mobile telephone terminal. - View Dependent Claims (9, 10, 11, 12, 13, 14, 15, 16)
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17. A control method for controlling a mobile radio telephone terminal, comprising, at said mobile terminal, the steps of:
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detecting a distance between said mobile radio telephone terminal and a signal source sending a first signal to said mobile radio telephone terminal; detecting a direction of said signal source as seen from said mobile radio telephone terminal; displaying the distance and the direction; controlling a direction of an antenna according to an electric field strength of the first signal to obtain a maximum gain; transmitting a second signal from said mobile radio telephone terminal to said signal source, said second signal is a position registration request signal requesting a registration of the position of said mobile telephone terminal; receiving a third signal transmitted from said signal source, in response to the second signal; measuring a time period from the transmission of the second signal to the reception of the third signal; and detecting the distance on the basis of the time period. - View Dependent Claims (18, 19, 20)
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21. A control method for controlling a mobile radio telephone system in which an available service area includes radio zones of a plurality of base stations and a mobile telephone terminal selects at least one base station and communicates with a fixed telephone terminal through the selected base station, said mobile telephone terminal:
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detecting a distance between said mobile radio telephone terminal and said base station sending a first signal to said mobile radio telephone terminal; detecting a direction of said base station as seen from said mobile radio telephone terminal; displaying the distance and the direction; controlling a direction of an antenna according to an electric field strength of the first signal to obtain a maximum gain; transmitting a second signal to said base station, said second signal is a position registration request signal requesting a registration of the position of said mobile telephone terminal; receiving a third signal transmitted from said base station, in response to the second signal; measuring a time period from the transmission of the second signal to the reception of the third signal; and detecting the distance on the basis of the measured time period measured. - View Dependent Claims (22, 23, 24, 25, 26)
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27. A mobile radio telephone terminal capable of communicating with another telephone terminal through a selected base station, the mobile radio telephone terminal comprising:
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a first detector detecting a distance between said mobile radio telephone terminal and selected base station sending a first signal to said mobile radio telephone terminal; a second detector detecting a direction of said selected base station as seen from said mobile radio telephone terminal; a display displaying the distance and the direction; a controller controlling a direction of an antenna in accordance with an electric field strength of the first signal to obtain a maximum gain; a transmitter transmitting a second signal to said selected base station; a receiver receiving a third signal transmitted from said base station in response to the second signal; and a measuring device measuring a time period from the transmission of the second signal to the reception of the third signal; wherein said first detector detects the distance on the basis of the time period measured by said measuring device, and the second signal is a position registration request signal requesting a registration of the position of said mobile telephone terminal. - View Dependent Claims (28, 29, 30, 31, 32, 33)
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34. A mobile radio telephone system in which an available service area includes radio zones of a plurality of base stations and a mobile telephone terminal selects at least one base station and communicates with a fixed telephone terminal through the selected base station, said mobile telephone terminal comprising:
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a first detector detecting a distance between said mobile radio telephone terminal and said selected base station sending a first signal to said mobile radio telephone terminal; a second detector detecting a direction of said selected base station as seen from said mobile radio telephone terminal; a display displaying the distance and the direction; a controller controlling a direction of an antenna in accordance with an electric field strength of the first signal to obtain a maximum gain; a transmitter transmitting a second signal to said selected base station; a receiver receiving a third signal transmitted from said base station in response to the second signal; and a measuring device measuring a time period from the transmission of the second signal to the reception of the third signal, wherein said first detector detects the distance on the basis of the time period measured by said measuring device, and the second signal is a position registration request signal requesting a registration of the position of said mobile telephone terminal. - View Dependent Claims (35, 36, 37, 38, 39, 40, 41, 42)
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Specification