JPH0290736A - Personal terminal equipment tracing system - Google Patents

Abstract

PURPOSE:To detect an area in which a portable terminal equipment is resident by adding a transmission function of a radio wave to the portable terminal equipment used in a radio paging system in addition to a call reception function, allowing an automobile telephone system to call the portable terminal equipment and to receive its reply signal. CONSTITUTION:The portable terminal equipment 1 sends a radio wave including a reply signal to notify its existing zone. An automobile telephone exchange 4 gives a command of receiving the radio wave including the reply signal from the portable terminal equipment 1 to radio base stations 5, 6,... provided in plural automobile telephone zones a, b,... resident in a radio paging area A. Upon the receipt of information of the reception of the reply signal of the portable terminal equipment 1 from the radio base station 5, the automobile telephone exchange 4 stores its information and outputs the result externally as visual information. Thus, the area in which the portable terminal equipment is resident is detected.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a personal tracking system, and more particularly to a personal tracking system that combines a car telephone system and a radio paging system.

[Conventional technology]

Conventional personal tracking methods have been possible with car phone systems or mobile phone systems that coexist with them, but not with small and lightweight terminal devices such as mobile terminals used in radio paging systems. .

[Problem to be solved by the invention]

The conventional personal tracking methods mentioned above are still large in size and their main purpose is to make phone calls, so there is currently a limit to how much they can be made smaller and lighter. Since it is not intended for tracking purposes, no efforts have been made to do so. Therefore, there is a problem in that it is unsatisfactory in terms of portability and economy if used as is for personal tracking.

On the other hand, the mobile terminal used in the wireless paging system is small and lightweight, but because of its purpose, the information transmission is one-way, so even if you have the mobile terminal, if there is no call from another party, there will be no problem. The problem is that it is worthless.

An object of the present invention is to set a part of the frequency band used by the car phone system to the same frequency band as the radio paging system in an area where a car phone system and a radio paging system coexist. Adding a call reception function and a radio wave transmission function to mobile terminals that operate, and by calling the mobile terminal from the car phone system and receiving the response signal, it is possible to detect the area where the mobile terminal is located, creating new value. The goal is to provide a personal tracking method that creates

[Means to solve the problem]

In the personal tracking system of the present invention, in an area where a car telephone system and a wireless paging system coexist, a part of the frequency band used by the car phone system is set to be the same frequency band as the frequency band used by the radio paging system, and the wireless A mobile terminal used in the calling system is equipped with a call receiving function and a radio wave transmitting function, and the mobile terminal sends a response signal using the radio wave transmitting function in response to a call from the car telephone system, and , is configured to receive the response signal and detect the zone where the mobile terminal exists.

〔Example〕

Next, embodiments of the present invention will be described with reference to the drawings.

FIG. 1 is a block diagram of one embodiment of the present invention.

The mobile terminal 1 receives a radio call from the calling device 2 of the radio paging system via the radio transmitter 3 wherever it is in the radio calling area A. In addition, the mobile terminal 1 has a radio wave transmitting function as well as a call receiving function. Even if a radio wave transmission function is added, a telephone call function is omitted, so it is sufficiently small compared to terminals of mobile phone systems, etc. The car telephone exchange 4 has a plurality of car phone zones a, b, . . . for making calls within the radio calling area A,
Wireless base stations 5, 6 that perform transmission and reception, respectively. ...is established. A portion of the frequency band used by the mobile telephone system is the same frequency band as the frequency band used by the radio paging system in all mobile telephone zones.

Next, the operation will be explained.

The present invention can be used as a radio paging system, but the operation in that case is exactly the same as the conventional operation, so a description thereof will be omitted.

When tracking an individual with respect to the mobile terminal 1, a radio call is made from the car telephone exchange 4 via the radio transmitter 3. At this time, control is performed so as not to collide with the radio call from the calling device 2 of the radio paging system, and a code is added to the transmitted signal to make it clear that it is a tracking signal. The mobile terminal 1 that receives this tracking radio call transmits radio waves containing a response signal to inform the mobile terminal 1 of the zone in which it exists. The car telephone exchange 4 has radio base stations 5, 6, . . . installed in a plurality of car telephone zones a, b, . ... to receive radio waves including a response signal from the mobile terminal 1. Now, when receiving information from the radio base station 5 that a response signal from a mobile terminal operator has been received, the car telephone exchange 4 stores the information and outputs it to the outside as visible information. By the way, since this information can be collected without any change being noticed by the person carrying the mobile terminal 1, various usage methods can be omitted.

For example, if a police officer, child, etc. carries it, their current location can be detected even in the event of an unexpected accident or kidnapping.

Alternatively, since this mobile terminal 1 is small, if it is attached to a car or valuables, its current location can be known by the means described above, and if it is also used with the ring tone of the original wireless calling function, it can be used even more. The law expands its scope.

〔Effect of the invention〕

As explained above, the present invention provides for wireless communication in areas where a car phone system and a radio paging system coexist, by making part of the frequency band used by the car phone system the same as the frequency band used by the radio paging system. By adding a call reception function and radio wave transmission function to the mobile terminal used in the paging system, by calling the mobile terminal from the car phone system and receiving the response signal, it is possible to detect the area where the mobile terminal is located. This has the effect of providing an individual tracking method that creates new value.

[Brief explanation of drawings]

FIG. 1 is a plot of one embodiment of the present invention: mobile terminal, 2: calling device, transmitter, 4: car telephone exchange, 5-wire base station, A
...Radio calling area, a. Car phone zone. This is a diagram. 3...Wireless 6...No b...Automatic

Claims (1)

[Claims] In an area where a car phone system and a radio paging system coexist, a part of the frequency band used by the car phone system is the same as the frequency band used by the radio paging system, and a mobile terminal used in the radio paging system A radio wave transmission function is added together with a call reception function, and the mobile terminal uses the radio wave transmission function to send out a response signal in response to a call from the car phone system, and the car phone system receives the response signal and sends a response signal to the call from the car phone system. A personal tracking method that detects the zone where a mobile device is located.