JPS6365250B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a theft tracking system in a mobile telephone switching system.

The theft tracking method in the conventional car telephone switching system is to identify the originating subscriber's number, the called subscriber's number, and the originating/receiving connection when the stolen car's telephone is actually used to make the incoming/outgoing connection. There is a method of visually displaying the zone (position) etc. by printing it on a typewriter or the like. However, this method has the disadvantage that the stolen car's phone cannot be known unless it is used. Generally, the car phone is turned off (generally, the car phone is turned off).
It may be possible to leave the POW ON/OFF by operating a key (SWITCH).

Therefore, in such a case, it is impossible to trace the theft.

SUMMARY OF THE INVENTION An object of the present invention is to provide a theft tracking method in a car telephone exchange system that can track a car phone even when the car phone is not in use.

In order to achieve the above object, the theft tracking method in the car telephone exchange system according to the present invention sends a special signal from the exchange side to a specific car via a paging channel to indicate that the car is being tracked for theft; A monitor means for detecting the special signal at a constant period regardless of whether the switch is on or off, and a start means for starting the transmitter when the monitor means determines that the special signal is for itself, and the exchanger side When a location registration signal of the vehicle is received from the transmitter,
It is configured to visually display the received information.

According to the above configuration, tracking is possible regardless of whether the mobile phone is used or not, and the object of the present invention is completely achieved.

Hereinafter, the present invention will be explained in more detail with reference to the drawings. FIG. 1 is a relay system diagram for explaining a theft tracking system in a car telephone exchange system according to the present invention. In the figure, MSS represents a mobile phone, BS represents a wireless base station, and MTS EX represents an exchange that controls calls to and from the mobile phone MSS. Wireless base station BS is for car phones
It is equipped with a signal transmitter/receiver TX/RX between the MSS and the MSS. The exchange MTS EX is a switching network SW, a paging control device P CONT that mainly controls incoming connections to the mobile phone MSS, modems PMD-1 to PMD-n connected to the wireless base station BS, and used for telephone calls. Bidirectional trunk BWT, control device E/D for receiving control information for setting a communication path, i.e., dialing signal in car oscillation, transmitting and receiving end-of-call signals, etc., control device for communication path system equipment.
SPC, data channel device DCH, central processing unit CC, main memory MM, transfer control device TC, typewriter TTY, and paging control device P
CONT, and a device EDC that controls the control device E/D. A paging channel PCH and a speech channel are set between the exchange MTS EX and the wireless base station BS.

Figure 2 shows a car equipped with an MSS car phone. The entire control circuit CONT of the car phone MSS is powered on and off by a human key operation. Paging channel PCH monitor circuit
MONI is a circuit that is supplied with power for a short period of time at regular intervals regardless of whether the power is turned on or off, and which detects SP'L PREAMBLE (data signal indicating theft tracking) from the exchange, which will be described later. The control circuit CONT is configured so that the power is turned on also by the detection of this SP'L PREAMBLE, and the transmitter/receiver TX/RX is also activated.

Figure 3 is a signal system diagram of this system, and a is the switchboard.
A special signal consisting of SP'L PREAMBLE sent from MTS EX to the paging channel PCH and the mobile phone number MSS No., b is the operating cycle of the mobile phone MSS monitor circuit, c is power-on of the entire control circuit, d is Activation of the receiver RX, c indicates the output including the mobile phone number MSS No. of the transmitter TX and the zone number Zn No. indicating the driving position of the car, respectively.

When it becomes necessary to track theft, a maintenance person enters a command from a typewriter TTY to indicate that the subscriber requires theft tracking in the relevant subscriber data.
It is stored in the main memory MM through the path shown in FIG. At the same time, the central processing unit CC sends information indicating that the telephone is being tracked for theft and the number MSS/No. of the car telephone to the paging control unit P CONT via the route shown in FIG. 1 and 2. Paging control device P
CONT responds to this and SP'L indicates that it is a theft pursuit as shown in Figure 3.
A data signal of PREAMBLE+MSSNo. is created and sent through the route shown in FIG. 1. On the other hand car phone
In MSS, SP′L is transmitted via wireless base station BS.
When the PREAMBLE+MSSNo. data signal arrives, the paging channel PCH monitor circuit
MONI detects SP'L PREAMBLE, which turns on the power to the entire control circuit and starts up the receiver RX, regardless of switch operation. Then, it receives the car phone number MSS・No., compares this number with its own number, and if they match, it starts up the transmitter TX, detects its driving position (zone) using a known method, and sends a data signal ( Zn/No.) and its own number
Paging control device P along with MSS No.
Send to CONT. Paging control device P
This is further received from CONT and transferred to the central processing unit CC via the route shown in Figure 1 and 2, and is transferred to the main memory.
Stored in MM. At the same time, it is printed on a typewriter TTY along the path shown in FIG. The mobile phone MSS then turns off the power supplied to the entire control circuit upon completion of transmission. On the other hand, if the result of checking the received mobile phone number MSS No. and the own number No. is that they do not match, the transmitter TX will not be activated.

As described above, the maintainer uses the typewriter TTY
The location of the stolen vehicle can be determined based on the information provided.

As explained in detail above, the present invention forcibly activates the transmitter of the car phone and transmits the location registration signal based on instructions from the exchange side.
It is possible to know the driving location of a stolen car even when it is turned off.

[Brief explanation of drawings]

FIG. 1 is a relay system diagram for explaining the theft tracking method in the car telephone exchange system according to the present invention, and FIG. 2 is a diagram showing the configuration of the car phone side.
FIG. 3 is a signal system diagram. MTS EX……Car telephone exchange, P CONT
...Paging control device, PMD-1~n...Modulator/demodulator, BWT...Bidirectional trunk, E/D...
...Call control information control device, SPC...Call path control device, DCH...Data channel device, CC...
Central processing unit, MM...Main memory device, TC
...transfer control device, TTY...typewriter,
EDC...device that controls P CONT and E/D, BS...wireless base station, TX/RX...transmitter/receiver, MSS...car phone.

Claims (1)

[Claims] 1 A special signal is sent from the exchange to a specific car via a paging channel to indicate that the car is being tracked for theft, and a monitor is sent to the car phone to detect the special signal at a constant cycle regardless of whether the switch is on or off. means, and activation means for activating a transmitter when the monitor means determines that the signal is a special signal for itself, and when the exchange side receives the location registration signal of the vehicle from the transmitter, the reception information thereof is provided. A theft tracking method in a car telephone exchange system, characterized in that the system is configured to visually display the following.