JPH1141162A - Portable radio equipment detection method and device therefor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To detect a portable radio equipment even in a waiting state by detecting a radio wave radiated from a portable radio equipment whose power is turned on, and detecting the existence of the portable equipment. SOLUTION: A portable radio equipment 1 such as a portable telephone set radiates an unnecessary weak radio wave even in a waiting state when the power is turned on. Also, at the time of receiving a response request signal, the radio wave is automatically transmitted. This transmitted radio wave is received by a receiving antenna 2, and the frequency and level are detected by a wide band receiver 3. The frequency and level detected by the wide band receiver 3 are referred to by a computer 4 with a data base 5 in which the information of the portable radio equipment 1 such as each kind of portable telephone set is stored. When it is judged that the radio equipment 1 such as the portable telephone set whose power is turned on is present according to the frequency and level of the received radio wave, the owner or the manager of the building or room is let know the existence by a warning device 6.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method and an apparatus for detecting the presence of a portable wireless device in a mobile communication system such as an automobile telephone system or a second generation digital cordless telephone system.

[0002]

2. Description of the Related Art In recent years, mobile communication systems using portable radio equipment, such as an automobile telephone system and a second generation digital cordless telephone system, have been rapidly increasing.
While these mobile communication systems can communicate anytime, anywhere, mobile radios are used near electronic and medical equipment, so radio waves from mobile radios can cause malfunctions in electronic and medical equipment. Is becoming

[0003] Therefore, there has been proposed a detector which issues an alarm when a portable wireless device is used near an electronic device, for example, during a call or a call. This type of detector is important in order to prevent malfunction of electronic devices due to radio waves emitted from portable wireless devices, and is particularly required in hospitals and facilities using precision machines.

FIGS. 7 and 8 show a conventional detector. FIG. 7 is a schematic view, in which 17 is a receiving antenna, and 18 is a device main body. FIG. 8 is a block diagram showing the configuration.
Reference numeral 17 denotes a reception antenna, 19 denotes a receiver, 20 denotes a reception level determination unit, 21 denotes a trigger level setting unit, 22 denotes a trigger generation unit, 23 denotes a transmission circuit unit, and 24 denotes a speaker.

Hereinafter, the principle of operation of the conventional detector will be described.
Radio waves radiated from the portable wireless device are received by the receiving antenna 17.
And received by the receiver 19 and converted into an electric signal. The reception level set by the trigger level setting unit 21 is determined by the reception level determination unit 20, and when the reception level is equal to or higher than the set trigger level, the trigger generation unit 22 generates a trigger signal. The transmitting circuit unit 23 that has received the trigger signal operates for a certain period of time to generate a signal, and causes the speaker 24 to sound.

If such a detector is mounted near an electronic device or on the main body of an electronic device and the trigger level is set appropriately, the portable wireless device may be used near the electronic device during a call or a call. A warning sound can be sounded to inform the surroundings.

[0007]

However, in some electronic devices, malfunction of an airplane or the like affects human life, and it may be too late to respond after an alarm sounds. Also,
Some portable wireless devices automatically emit radio waves when switching communication zones or receiving calls, so it is necessary to detect whether or not the portable wireless device is operating even if it is in a standby state. .

Therefore, in such a case, unlike a conventional detector, the emitted radio wave is not detected and an alarm is issued, and it is determined that the portable wireless device is operating even in the standby state. A device to detect is required.

The present invention has been made in view of the above circumstances, and has as its object to provide a portable wireless device detection method and apparatus capable of detecting a portable wireless device even when the portable wireless device is in a standby state.

[0010]

In order to achieve the above object, a portable wireless device detection method according to the present invention detects a radio wave radiated from a portable wireless device that is turned on and detects the presence of the portable wireless device. Is detected.

In the portable wireless device detecting method of the present invention, the communication of the portable wireless device which is turned on is temporarily interrupted, and when the communication is restored, the radio wave radiated from the portable wireless device is detected to detect the presence of the portable wireless device. It is characterized by detecting.

Further, the portable wireless device detection method according to the present invention is characterized in that the portable wireless device detection method is performed in a state where the device is electromagnetically shielded. Further, the portable wireless device detection device of the present invention is a portable wireless device detection device that detects the presence of a portable wireless device in a mobile communication system, by detecting a radio wave emitted when the portable wireless device is in an operating state, thereby detecting an operation state It is characterized by detecting the presence of a portable wireless device.

Further, the portable wireless device detection device of the present invention, in the portable wireless device detection device, does not directly need a wireless communication such as a clock of a local oscillator or a CPU used by the portable wireless device in an operating state. It is characterized by detecting the presence of an operating portable radio device by detecting unnecessary radio waves.

Further, in the portable wireless device detection device according to the present invention, when the target mobile communication system is a communication system that requires location registration control, the portable wireless device may be provided with a noise radio wave. To generate a state in which communication radio waves cannot be received, and receive a position registration request signal emitted from the portable radio device or a control signal emitted from the circuit board after the noise radio wave is eliminated, so that the mobile phone in the operating state is received. It is characterized by detecting the presence of a wireless device.

Further, in the portable wireless device detection device according to the present invention, when the target mobile communication system is a communication system that requires location registration control, the portable wireless device can be placed in an electromagnetically shielded room. Once the device is inserted, the portable wireless device is placed in the electromagnetic shield state, and when the portable wireless device is taken out of the electromagnetically shielded room, the radio signal of the position registration request signal transmitted by the portable wireless device or the control signal emitted from the circuit board is received. And detecting the presence of an operating portable wireless device.

The portable wireless device detection device of the present invention is characterized in that, in the portable wireless device detection device, a metal shield room is used as an electromagnetic shield room.

The present invention detects a radio wave radiated from a portable wireless device even in a standby state. A radio wave is automatically transmitted to a portable wireless device artificially and the radio wave is detected. Thus, the main feature is to detect a portable wireless device in a standby state.

[0018]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments of the present invention will be described below in detail with reference to the drawings. FIG. 1 shows an embodiment of the present invention, which is a system for detecting a portable wireless device by detecting a radio wave emitted by a portable wireless device in a standby state. In FIG. 1, 1 is a portable wireless device such as a mobile phone, 2 is a receiving antenna, 3 is a broadband receiver, 4 is a comparison between the frequency of the radio wave received by the wideband receiver 3 and the frequency of the radio wave recorded in the database 5. A computer that determines the presence of the portable wireless device 1;
Is a database of radio waves radiated by, and 6 is an alarm device.

If the portable radio equipment 1 such as a portable telephone is powered on, the receiving unit and the control unit are operating even in the standby state, so that the local transmitters used in these parts are weak. And unnecessary radio waves radiated from the clock of the CPU. Further, when it is determined that the reception of the location area information has been temporarily stopped and the mobile terminal has once gone out of the area, or when a response request signal has been received, a radio wave is automatically transmitted.
The present detection device receives this radio wave, detects the presence of a portable wireless device such as a powered-on cellular phone, and sounds an alarm.

A radio wave transmitted from a portable wireless device 1 such as a portable telephone is received by a receiving antenna 2 and is received by a broadband receiver 3.
, The frequency and level are detected. The frequency and level detected by the broadband receiver 3 are referred by the computer 4 to a database 5 in which information on the portable wireless device 1 such as various portable telephones is stored. The frequency of the received radio waves,
When it is determined that there is a portable wireless device 1 such as a portable telephone which is turned on according to the level, the alarm device 6 notifies the owner or the manager of the building or room of the presence.

If such a system is installed at the entrance of a building or a room, it is possible to prevent a portable wireless device 1 such as a portable telephone which is turned on from being brought into the building or the room, and Malfunction of the electronic device or the like by the portable wireless device 1 such as a telephone can be prevented beforehand, which is effective for accident prevention.

(Embodiment 1) FIG. 2 shows a first embodiment of the present invention.
Shown in In the figure, the same parts as those in FIG. 1 are denoted by the same reference numerals, and description thereof will be omitted. In FIG. 2, reference numeral 7 denotes an electromagnetic shield room, and reference numeral 8 denotes a metal door. When the portable wireless device 1 is turned on, the receiving unit and the control unit are operating even in the standby state, so that unnecessary radio waves using the clock of the local oscillator or CPU used in these units as a wave source are generated. It radiates but is very weak. Therefore, the holder is put into the electromagnetically shielded room 7 through the metal door 8 and there is no external electromagnetic wave, and the radio wave radiated from the portable wireless device 1 is detected. In this case, similarly to FIG. 1, radio waves are detected by a portable wireless device detection system including a receiving antenna 2, a broadband receiver 3, a computer 4, a database 5, and an alarm device 6.

In this embodiment, by detecting radio waves radiated from the portable wireless device 1 in the electromagnetic shield room 7,
The radio wave can be more reliably detected, and the mobile wireless device 1 can be detected more effectively. Note that the present invention can be implemented even without the electromagnetic shield room 7.

The measurement frequency includes a band of about 30 MHz to 4 GHz, and there are radio waves from other portable computers. Therefore, by measuring a plurality of radio waves, it is determined whether the radio wave is radiated from the portable wireless device. Judge comprehensively. Therefore, as the receiving antenna 2, a log periodic antenna, an active dipole antenna, a ridge guide antenna, or the like that has high sensitivity and can perform wideband reception is used. A spectrum analyzer or the like having a preselector function is used for the broadband receiver 3, but a preamplifier or the like is required when the radio wave radiated from the portable wireless device is weak.

(Embodiment 2) FIG. 3 shows a second embodiment of the present invention.
Shown in In the figure, the same parts as those in FIG. 2 are denoted by the same reference numerals, and description thereof will be omitted. In FIG. 3, 9 is a radiation antenna, 1
0 is a transmitter, and 11 is a white noise generator.

The portable wireless device 1 having the communication system requiring the position registration control receives the position area information at all times. Either a radio wave is transmitted or a control signal for the circuit board is transmitted as an unnecessary radio wave.

In this embodiment, the white noise generator 11
And irradiating the mobile radio device 1 with noise radio waves from the radiation antenna 9 using the transmitter 10 to create a state in which the mobile radio device 1 cannot artificially receive radio waves for communication, and thereafter, after the noise radio waves disappear, Then, the location detection request radio wave or the unnecessary radio wave transmitted from the portable wireless device 1 is detected to generate an alarm.

In this case, similarly to FIG. 1, a position registration request radio wave or an unnecessary radio wave is detected by a portable radio device detection system including a reception antenna 2, a broadband receiver 3, a computer 4, a database 5, and an alarm device 6.

In the present embodiment, by detecting radio waves radiated from the portable wireless device 1 in the electromagnetic shield room 7,
The radio wave can be more reliably detected, and the mobile wireless device 1 can be detected more effectively. Note that the present invention can be implemented even without the electromagnetic shield room 7.

(Embodiment 3) FIG. 4 shows a third embodiment of the present invention.
Shown in In FIG. 4, 2 is a receiving antenna, 3 is a broadband receiver, 4 is a computer, 5 is a database, 6 is an alarm device, and 7 is an electromagnetic shield room.

FIGS. 5A and 5B respectively show FIGS.
3 is a schematic configuration perspective view for explaining details of the electromagnetic shield room of FIG. 1, 12 is a metal wall, 13 is a radio wave absorber wall,
14 is a metal door entrance, 15 is a metal door exit, 16
Is a metal blind.

FIG. 6 is an explanatory diagram showing an operation sequence according to the present embodiment, in which the vertical axis indicates the passage of time, and the portable wireless device, the portable wireless device detecting device, and the base are respectively shown from the left axis. The operation of the station is shown, and the horizontal axis shows the exchange of signals between them.

The operation principle of the third embodiment will be described below. In FIG. 4, when the portable wireless device 1 in the standby state enters the electromagnetically shielded room 7, the radio wave from the base station does not reach, and the talkable state is changed to the talk impossible state (out of service area). Next, when the portable wireless device 1 leaves the electromagnetically shielded room 7, the portable wireless device 1 that performs position registration control emits a radio wave for performing a position registration request to the base station (FIG. 6). If the station exists and returns the radio wave of the authentication request to the portable wireless device 1, further negotiation is performed, an authentication response signal is transmitted from the portable wireless device 1 to the base station, and the location registration reception signal is transmitted from the base station to the portable wireless device 1. 1 to complete location registration. The portable wireless device detection device according to the present embodiment receives a radio wave for the first position registration request to be in a talking state again after the portable wireless device 1 leaves the electromagnetically shielded room 7. The reception of the radio wave is performed through the reception antenna 2 shown in FIG.
Do with. The signal received by the broadband receiver 3 is collated by the computer 4 with the operating frequency information of the mobile communication system recorded in the database 5 to determine whether the radio wave used by the portable wireless device 1 or environmental noise. If so, the alarm device 6 is operated to perform detection.

In FIG. 5, (a) a metal door is usually used for the entrance and the exit of the electromagnetically shielded room, but a metal blind as shown in FIG. As described above, a material capable of shielding electromagnetic waves can be used. In this case, since the metal blinds and the glass with the metal mesh have a lower electromagnetic wave shielding property than the metal door, the electromagnetic wave shielding property can be improved by providing the radio wave absorber wall 13 inside the shield room. it can. In the figure, the arrow indicates the moving direction of the portable wireless device 1.

The electromagnetically shielded rooms shown in FIGS. 5A and 5B allow a visitor to a hospital or the like to pass a portable wireless device by passing through a gate for appropriately shielding radio waves such as a metal detection gate at an airport. Applicable when detecting.

[0036]

As described above, according to the present invention, a radio wave is automatically emitted from a portable radio device by means of artificially irradiating a control radio wave, applying noise or entering an electromagnetically shielded room. By measuring the emitted radio waves, it is possible to detect the presence of a mobile wireless device that is in an operating state. However, there is an advantage that a malfunction of an electronic device due to a strong radio wave radiated during a call can be prevented.

[Brief description of the drawings]

FIG. 1 is a configuration explanatory diagram showing an embodiment of the present invention.

FIG. 2 is a configuration explanatory view showing a first embodiment of the present invention.

FIG. 3 is a configuration explanatory view showing a second embodiment of the present invention.

FIG. 4 is a configuration explanatory view showing a third embodiment of the present invention.

FIG. 5 is a configuration explanatory view showing a shield room in a third embodiment of the present invention.

FIG. 6 is an explanatory diagram showing an operation sequence according to the third embodiment of the present invention.

FIG. 7 is a schematic view showing a conventional portable wireless device detection device.

FIG. 8 is a configuration explanatory view showing a conventional portable wireless device detection device.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Portable radio equipment 2 Receiving antenna 3 Broadband receiver 4 Computer 5 Database 6 Alarm device 7 Shield room 8 Metal door 9 Radiating antenna 10 Transmitter 11 White noise generator 12 Metal wall 13 Radio wave absorber wall 14 Metal door entrance 15 Metal door exit 16 Metal blind 17 Receiving antenna 18 Device main body 19 Receiver 20 Reception level judgment unit 21 Trigger level setting unit 22 Trigger generation unit 23 Transmission circuit unit 24 Speaker

 ──────────────────────────────────────────────────の Continued on the front page (72) Inventor Fujio Amamiya 3-19-2 Nishishinjuku, Shinjuku-ku, Tokyo Nippon Telegraph and Telephone Corporation

Claims (8)

[Claims] 1. A portable wireless device detection method comprising: detecting radio waves radiated from a portable wireless device that is turned on to detect the presence of the portable wireless device. 2. The portable wireless device according to claim 1, wherein the communication of the portable wireless device which is turned on is temporarily interrupted, and the presence of the portable wireless device is detected by detecting a radio wave radiated from the portable wireless device when communication is restored. Device detection method. 3. A portable wireless device detection method according to claim 1, wherein the method is performed in a state where the device is electromagnetically shielded. 4. A portable wireless device detection device for detecting the presence of a portable wireless device in a mobile communication system, by detecting a radio wave emitted when the portable wireless device is in an operating state, thereby detecting the presence of the operating portable wireless device. A portable wireless device detection device for detecting. 5. A portable wireless device detecting device according to claim 4, wherein unnecessary radio waves not directly required for wireless communication, such as a local oscillator or a CPU clock, used by the portable wireless device in an operating state are detected. A portable wireless device detection device for detecting the presence of an operating portable wireless device. 6. The portable wireless device detection device according to claim 4, wherein the mobile communication device emits noise radio waves when the target mobile communication system is a communication method that requires location registration control. By creating a state in which communication radio waves cannot be received, and receiving a position registration request signal emitted by the portable radio device or a control signal emitted from the circuit board after the noise radio wave is eliminated, the mobile radio device in the operating state is received. A portable wireless device detection device for detecting presence. 7. The portable wireless device detection device according to claim 4, wherein the target mobile communication system is a communication system that requires location registration control, and the portable wireless device is placed in an electromagnetically shielded room. Once, put the portable wireless device in the electromagnetic shield state, and receive the position registration request signal transmitted by the portable wireless device when the portable wireless device is taken out of the electromagnetically shielded room or the radio wave of the control signal emitted from the circuit board, A portable wireless device detection device for detecting the presence of an active portable wireless device. 8. The portable wireless device detection device according to claim 7, wherein a metal shield room is used as the electromagnetic shield room.