Position display system of mobile terminal

Abstract

A position detection system of a mobile terminal includes a small zone communication system (50) such as the PHS system, and a center station (1) connected to an exchange station (2) forming the PHS system. When a call is dispatched from the center station to the telephone number of a mobile station 7 of which the position is to be identified, the call signal is transmitted to a repeater (6) located closest to the mobile station (7) via exchange stations (2, 4) and main lines (3, 5) forming the PHS system (50). Since the mobile station (7) can identify the identification number of the closest repeater (6), the position of repeater (6) can be identified by referring to the database of the PHS system (50) using the repeater database provided in a center control station (51). The position can be displayed on a CRT screen at the center station (1) side. A position detection apparatus of a mobile terminal that can detect a position at low cost and at high accuracy is provided.

Description

[0001] 1. Field of the Invention[0002] The present invention relates to a position display system of a mobile terminal, a center station therefor, and a mobile terminal thereof. Particularly, the present invention relates to a position display apparatus of a mobile terminal employing a small zone communication system, a system therefor, and a mobile terminal thereof.[0003] 2. Description of the Background Art[0004] A method of detecting the position of a mobile of interest to the present invention is disclosed in Japanese Patent Publication No. 6-93650, for example. According to the present publication, waves from a plurality of repeaters are received at respective mobiles in a mobile communication system for carrying out communication between a repeater and a mobile via a wave. By using a coverage contour of a reception electric field level from each repeater obtained in advance, the range in which a mobile can be located corresponding to each reception level is obtained to detect ...

AI Technical Summary

Benefits of technology

[0021] Another object of the present invention is to provide a mobile terminal that allows position detection at a low cost and at high accuracy.

[0022] A further object of the present invention is to provide a center apparatus that is employed in a position detection system of a mobile terminal at a low cost and at high accuracy.

[0023] Still another object of the present invention is to provide a system that allows automatic transmission of position information of a mobile terminal carried by a driver and the like to a center apparatus even when the driver is remote from a vehicle.

Problems solved by technology

However, it is difficult to draw the coverage contour in the frequency range used for a general mobile wireless telephone system and, therefore, it is not practical.

However, such a system cannot be applied to the system wherein the location of a man or a vehicle is detected with a precision of some 10 meters.

Since the driver is remote from the vehicle during the door delivery or reception, there is a possibility that an inquiry of the position of the vehicle from a wireless of the dispatch center is not responded.

The dispatch center may not easily catch a delivery vehicle near the client even though the client has urgent needs.

There was a problem that a complaint was filed of delayed service from customers.

Furthermore, the dispatch center must take the trouble to contact the driver of the mobile vehicle to have the driver's current location described orally in this MCA method.

This is not only tedious, but also places a considerable burden on the driver.

There was a problem that confirmation of the position information is troublesome.

However, such sign posts are installed only in the coverage area of the service vehicle.

Naturally, there is a limit in using this system over a wide area range.

There is also a problem that the sign post zone is so large that specification of the position of a mobile station becomes too rough to result in low precision of the position.

There is also a limit in reducing the size and weight of the mobile station since the output power of the transmitter is 1 W. There is also a problem that the position information of a mobile station must be transmitted to the center station through a taxi wireless and the like, which is rather tedious.

Furthermore, extension of the sign posts causes increase in the facility cost.

Reduction in size, weight, and cost as a terminal system cannot be achieved.

However, the coverage area is extremely limited with such a weak wave that is allowed according to the current Wireless Telegraphy Act.

Such position confirmation devices are not practical.

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