JP4819721B2 - Wireless LAN terminal anti-theft system and method - Google Patents

Description

  The present invention relates to a system that prevents theft of a wireless LAN terminal that is portable in a network using a wireless LAN and that stores confidential information such as company and customer information, and in particular, the wireless LAN terminal is configured in the network. The present invention relates to a wireless LAN terminal theft prevention system and method having a function of suppressing theft by constantly monitoring the radio wave level of a wireless LAN access point.

  Conventionally, measures have been taken to prevent theft of terminal devices such as personal computers (PCs) and printers installed in offices and educational institutions. However, as a recent trend, a large-scale LAN is often constructed, and it is not sufficient to lock a room installed at night or on holidays, and anti-theft measures are required for each PC. . For example, each PC may be fixed to a desk using a shaft or chain, or an anti-theft buzzer may be provided. However, even when fixed with a shaft or chain, the PC can be removed by using a tool, and there is a problem that the anti-theft buzzer does not work unless there is a security guard nearby.

  On the other hand, according to the following Patent Document 1, “Since a siren is emitted at a personal computer device installation location and at the same time, the theft occurrence device and the theft device are automatically notified to a theft monitoring device installed at a remote location. A method of “expressing to the spot” is disclosed. Also, according to Patent Document 2 below, a method of monitoring and diagnosing a distributed LAN is disclosed.

JP-A-9-27087 JP 2000-6737 A

  In the conventional technology, in a wireless LAN terminal that can be easily carried, monitoring by only the management server is delayed, and if it is taken out of the system area, it cannot be searched.

  Further, when a wireless LAN terminal is put in a bag or the like and taken out, it is impossible to investigate the criminal on the spot even if the theft is detected.

  In addition, when the wireless LAN terminal was put into a radio wave shielding case and the connection between the wireless LAN terminal and the wireless LAN access point was broken, it was impossible to determine whether the wireless LAN terminal was turned off or stolen.

  An object of the present invention is to provide a wireless LAN terminal anti-theft system and method capable of monitoring the presence / absence of a wireless LAN terminal with a management terminal and simultaneously performing crime prevention on the wireless LAN terminal side.

  In order to solve the above problems, the present invention employs means for solving the problems having the following characteristics.

  A wireless LAN terminal anti-theft system according to a first aspect of the present invention is a wireless LAN system having a wireless LAN terminal and a wireless LAN access point connected to the wireless LAN terminal through a wireless LAN network. The radio field intensity for monitoring whether or not the radio field intensity of the wireless LAN access point is below a predetermined threshold value, and sending a warning signal to the wireless LAN terminal when the value of the radio field intensity falls below the predetermined threshold value It includes a monitoring means.

  The wireless LAN terminal has an ID input unit, and the ID input unit receives the warning signal and displays a user ID input screen on the screen of the wireless LAN terminal.

  The wireless LAN terminal includes a warning sound generation unit, and the ID input unit is a case where the user ID is not input to the ID input unit when the user ID is below the predetermined threshold, or a user ID Only when a different ID is input, a warning sound generation signal is sent to the warning sound generation means, and the warning sound generation means generates a severe warning sound when receiving the warning sound generation signal.

  A management terminal connected to the wireless LAN access point; and the radio field intensity monitoring means, when the value of the radio field intensity falls below the predetermined threshold, the management terminal via the wireless LAN access point Sends a theft warning notification signal.

  A wireless LAN terminal theft prevention method according to a second aspect of the present invention is a wireless LAN terminal theft prevention method in a wireless LAN system having a wireless LAN terminal and a wireless LAN access point connected to the wireless LAN terminal through a wireless LAN network. Monitoring whether the radio field intensity of the wireless LAN access point is below a predetermined threshold value, and sending a warning signal to the wireless LAN terminal when the radio field intensity value is below the predetermined threshold value It has the step to perform.

  In addition, when the ID input unit of the wireless LAN terminal receives the warning signal, there is a step of displaying a user ID input screen on the screen of the wireless LAN terminal.

  Also, the warning sound generation signal is transmitted only when the user ID is not input or an ID different from the user ID is input to the ID input unit when the threshold value is below the predetermined threshold. And a step of generating a severe warning sound when the warning sound generation signal is received.

  And a step of sending a theft warning notification signal to the management terminal via the wireless LAN access point when the value of the radio field intensity falls below the predetermined threshold.

  According to the present invention, it is possible to suppress theft as well as theft has occurred, thereby improving security. The details will be described below.

According to the present invention, a warning sound is generated when an unauthorized user tries to take out a wireless LAN terminal, so that it is possible to determine who is trying to steal.

  In addition, according to the present invention, not only monitoring at the management terminal but also the wireless LAN terminal itself generates a warning sound, so that the criminal can be identified on the spot.

  Further, according to the present invention, when the use prohibition area outside the use area is added to the outside of the building and the entrance of the building is also a prohibited area, a warning is given just by approaching the entrance / exit by theft, thereby preventing theft.

Next, an embodiment of the present invention will be described in detail with reference to the drawings. The configuration of a wireless LAN terminal antitheft system according to the present invention is shown in FIG. The wireless LAN terminal 1 has a wireless LAN that can be connected to a network by connecting to a wireless LAN access point 4. The wireless LAN terminal 1 includes a radio wave intensity monitoring unit 2 that constantly monitors the radio wave intensity from the wireless LAN access point 5 and monitors whether the radio wave intensity is below a certain threshold. The radio field intensity monitoring unit 2 sends a warning sound generation signal to the warning sound generator 3 when it falls below a certain threshold. The warning sound generator 3 generates a warning sound when it receives a warning sound generation signal. The radio wave intensity monitor unit 2 sends the stolen alert notification signal indicating that via a wireless LAN access point 5 at the same time make generate an alarm sound warning sound generator 3 might theft occur management terminal 6 To do. In addition, the radio wave intensity monitoring unit 2 includes an ID input unit 4 for allowing a user who is carrying it to input an ID to determine whether the user is an unauthorized person.

  The wireless LAN access point 5 is a wireless LAN access point for connecting the wireless LAN terminal 1 to the wireless LAN network. The management terminal 6 has a function of managing the presence / absence of the wireless LAN terminal 1.

(Description of operation)
The radio field intensity monitoring unit 2 of the wireless LAN terminal 1 constantly monitors the radio field intensity from the wireless LAN access point 5 and monitors whether the value of the radio field intensity falls below a preset threshold value. This threshold value is set in advance by investigating the wireless LAN usage area in advance and measuring the radio field intensity in the area where use is permitted and the area where use is not permitted. If it is below this threshold, it is determined that the wireless LAN terminal has been carried to a place where use is not permitted, and the system operates as follows.

The radio wave intensity monitoring unit 2 transmits a warning signal to the ID input unit 4 when the value of the radio wave intensity falls below the threshold value. When receiving the warning signal, the ID input unit 4 displays on the screen of the wireless LAN terminal 1 the warning display and / or a display for prompting the input of the user ID, and prompts the carrying user to input the ID. Note that the user may be informed by causing the LED to emit light without using the screen of the wireless LAN terminal 1. Here, it is determined whether or not the user is a legitimate user by inputting data that can prove the legitimate user of the terminal, such as a user ID number, from the keyboard of the wireless LAN terminal 1. If the input user ID is different from the original user ID, or if the user ID is not input within a certain period of time, it is determined that the theft has occurred, and the ID input unit 4 sends a warning sound generation signal to the warning sound generator 3. It sends a warning sound generator 3 generates intense warning sound when receiving the alarm generating signals.

  A management terminal 6 is connected to the wireless LAN access point 5. The radio wave intensity monitoring unit 2 sends a theft warning notification signal to the management terminal 6 via the wireless LAN access point 5 when the value of the radio wave intensity falls below the threshold value.

  Further, each of the above-described embodiments is merely an example of a preferred embodiment of the present invention, and the present invention can be implemented with various modifications without departing from the gist thereof.

  As an application example of the present invention, the present invention is applied to a personal computer used in a company that contains a lot of secret data that needs to maintain high security, a dedicated terminal used for ordering or inventorying goods used in the distribution industry, and the like.

It is the figure which showed the structure of the wireless LAN terminal antitheft system which concerns on this invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Wireless LAN terminal 2 Electric wave intensity monitoring part 3 Warning sound generator 4 ID input part 5 Wireless LAN access point 6 Management terminal

Claims (2)

In a wireless LAN terminal anti-theft system comprising a wireless LAN terminal, a wireless LAN access point connected to the wireless LAN terminal via a wireless LAN network, and a management terminal connected to the wireless LAN access point,
The wireless LAN terminal is
Radio field intensity monitoring means for monitoring whether radio field intensity from the wireless LAN access point is below a predetermined threshold, and outputting a warning signal when the value of the radio field intensity is below the predetermined threshold;
An ID input unit for receiving the warning signal and displaying a user ID input screen on the screen of the wireless LAN terminal;
Warning sound generating means,
The ID input unit generates the warning sound only when the value is below the predetermined threshold and the user ID is not input to the ID input unit or an ID different from the user ID is input. A warning sound generation signal is sent to the means, and the warning sound generation means generates a warning sound when receiving the warning sound generation signal,
The wireless LAN terminal is configured to send a theft warning notification signal to the management terminal via the wireless LAN access point when the value of the field intensity falls below the predetermined threshold. An anti-theft system ,
The predetermined threshold value is a radio wave intensity that can measure the radio field intensity in an area where use of the wireless LAN usage area is permitted in advance and an area where use is not permitted, and distinguish the use permitted area from the area where use is not permitted. A wireless LAN terminal theft prevention system, wherein a value is set . In a wireless LAN terminal theft prevention method in a wireless LAN system comprising a wireless LAN terminal, a wireless LAN access point connected to the wireless LAN terminal via a wireless LAN network, and a management terminal connected to the wireless LAN access point,
The radio field intensity monitoring unit of the wireless LAN terminal monitors whether or not the radio field intensity from the wireless LAN access point is below a predetermined threshold, and if the radio field intensity value is below the predetermined threshold, a warning signal A step of outputting
Displaying the user ID input screen on the screen of the wireless LAN terminal when the ID input unit of the wireless LAN terminal receives the warning signal;
The wireless communication is performed only when the ID input unit falls below the predetermined threshold and the user ID is not input to the ID input unit or when an ID different from the user ID is input. Sending a warning sound generation signal to a warning sound generator of the LAN terminal, and generating a warning sound in the warning sound generator ;
The wireless LAN terminal theft, comprising: a step of sending a theft warning notification signal to the management terminal via the wireless LAN access point when the radio field intensity monitoring unit falls below the predetermined threshold value. A prevention method ,
The predetermined threshold value is a radio wave intensity that can measure the radio field intensity in an area where use of the wireless LAN usage area is permitted in advance and an area where use is not permitted, and distinguish the use permitted area from the area where use is not permitted. A wireless LAN terminal theft prevention method, wherein a value is set .

Images