JPS5944133A - Method for tracking stolen car by car telephone exchange system - Google Patents

Abstract

PURPOSE:To check the travelling position of a stolen car by starting a transmitter of a car telephone forcedly by an indication from the exchanged side to make the transmitter transmit a position registration signal. CONSTITUTION:A specific signal indicating the tracking of a stolen car is transmitted from the exchanged side to a specific car through a paging channel. A telephone on the car side has a monitoring means MON1 to detect an upper stream specific signal with a fixed period independently of the on/off of a switch, and when discriminating the specific signal to the self-station, starts a transmitter to transmit position registration information. Receiving the position registration information from the car telephone, the exchange side displays the information visually.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a theft tracking method for a four-talk vehicle exchange system.

Theft tracking method in conventional car telephone switching systems is to identify the number of the calling subscriber, the number of the called subscriber, and the connection made when the stolen car's phone is actually used to make and receive calls. There is a method of visually displaying the zone (position) etc. that has been marked, such as by printing it on a typewriter.

However, this method has the disadvantage that it cannot be known unless the phone is used. Generally, it is conceivable to leave the power of the car phone off (in general, the car phone (ON-OF'F of POW of fi is performed by operating SWITα( )).

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 if the car phone is not used.

In order to achieve the above object, the theft tracking system in the car telephone exchange system according to the present invention sends a special signal from the intercom side to a specific car via the paging channel to indicate that the car is being tracked for theft. A monitor means for detecting the special signal at a constant cycle regardless of whether the switch is turned on or off, and a starting means for starting the transmitter when the monitor means determines that the special signal is for itself. is provided so that when the exchange receives the location registration signal of the vehicle from the transmitter, the received information is visually displayed.

According to the above-mentioned configuration, the object of the present invention is completely achieved, regardless of whether the automatic top filling machine is used or not. I will explain and explain in more detail. FIG. 1 is a relay method diagram for explaining the theft tracking method in the automatic tun'Cη one-talk exchange system according to the present invention. In the figure, 1M5S is an automatic 1 (telephone), BS is a wireless base station, and MTS I-X is a switchboard that controls calls to and from a mobile phone @MSS. The exchange MTSEX is equipped with a paging control device PC!ONT that controls incoming connections to the switching network SW, mainly the mobile phone MSS.

Modem PM connected to wireless base station BS
D-1~n, bidirectional trunk BWT used for calls;
A control device E/D that receives control information for setting a communication path, that is, a dial signal in car oscillation, transmits and receives a call termination signal, etc., and a control device SP of communication path system equipment.
O, data channel device DOH1 central processing unit 00,
Main memory MM, transfer control device ffTo, typewriter TTY and paging control device PCONT.

It consists of a device EDO that controls the control device E/D. The exchange MTS EX, the wireless base station Build paging channel PCH, and the communication channel are set.

Figure 2 shows a car equipped with a car phone MSS.

Automatic*@, the control circuit 0 of the telephone packing machine B The power supply of the entire ONT is turned on and off by a key operation by a person. The monitoring circuit MONI of the paging channel POH is supplied with power for a certain period of time regardless of the IF and source on/off, and SP'L PREAMBL is supplied from the exchanger described later.
This is a circuit that detects E (data signal indicating theft tracking). The control circuit 0ONT is this SP'LPRg
The configuration is such that the power is turned on also by the detection of AMBLg, and the transmitter/receiver i'X/RX is also activated.

Figure 3 is a signal system diagram of this system, and (a) is the switch MT8E.
SP sent from X to paging channel PCH
'T, PR, EAMBLg and car phone number M
Special signal consisting of SS and A, (b) is car phone MS
S is the operating cycle of the monitor circuit, (C) is the d of the entire control circuit.
Power on, (d) activation of receiver RX, (C) activation of transmitter T
The outputs include the number M8B-& of the car phone of X and the zone number Zn-A indicating the driving position of the car.

If it becomes necessary to trace the theft, the maintenance personnel will use the typewriter T.
When the fact that the subscriber is a theft tracking required subscriber is entered in the corresponding subscriber data by a command from TY, it is stored in the main memory MM through the path shown in FIG. 1. At the same time, central processing bag
The CC sends information indicating that the phone is being tracked for theft and the car phone number M88-A to the paging control device P0ONT via the route shown in FIG. Baging control device P
In response to this, 0ONT sends SP'L PREAMBLE indicating that it is theft tracking as shown in Figure 3.
+MSS A data signal is created and transmitted through the route shown in Figure 1 (■). On the other hand, in automatic M and lightning 1-talk machine MSS, SP'L PREAMBLK +M is sent via wireless base station BS.
When the data signal of 88 A comes in, the monitoring circuit MONI of the paging channel PCH becomes SP'L PH.
EAMBl is detected, and this turns on the power source for the entire control circuit regardless of switch operation and turns on the receiver RX.
launch. Then, it receives the car phone number M S S-A and matches this number with its own black number. If they match, it turns on the transmitter TX, detects its own driving position (zone) by a known method, and sends a data signal. (Zn-A) with its own number MS
It is sent to the paging control device POONT along with S. gourd. The data is further received from the paging control device P0ONT and transferred to the central processing unit 00 through the path shown in FIG. 1, where it is stored in the main memory MM. At the same time, it is printed on the typewriter TTY along the path shown in Figure 1 (■). Then, when the transmission ends, the mobile phone MSS turns off the power supplied to the entire control circuit. On the other hand, the received automatic telephone number M
As a result of the match between the SS-cup and its own number maker, if there is a mismatch, the transmitter TX is not activated.

As described above, the maintenance person can know the traveling position of the stolen automobile from the information printed on the typewriter TTY.

As explained in detail above, the present invention forcibly activates the transmitter of a car phone and sends a location registration signal based on instructions from the exchange, thereby preventing theft even when the power is turned off. You can know the running position of the car.

[Brief explanation of the drawing]

FIG. 1 is a relay system diagram for explaining the theft tracking method in a car telephone exchange system according to the present invention, FIG. 2 is a diagram showing the configuration of the car telephone side, and FIG. 3 is a signal system diagram. MT8 EX...Car telephone exchange POONT...
- Baging control device PMD-1 to 11... Modulation/demodulation device BWT... Bidirectional trunk E/D... Call control information control device spa... Call path control device D OH... Data channel device OC. ... Central processing unit MM ... Main memory device TC ... Transfer control device TTY ... Typewriter E
DO... Device BS that controls POONT and E/D
...Radio base station TX/R,X...Transmitter/receiver MS
S... Car phone patent applicant NEC Corporation representative Patent attorney Hisashi Inoro

Claims (1)

[Claims] A monitoring means for sending a special signal indicating that the vehicle is being tracked stolen from the exchange via a paging channel, and detecting the special signal at a constant cycle on the car phone side regardless of whether the switch is on or off. 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 receives the position registration signal of the vehicle from the transmitter, the reception information is transmitted. A theft tracking method for a car telephone exchange system characterized by being configured to visually display the information.