| 摘要 |
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.
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