JP4655798B2 - Mobile phone terminal with electromagnetic interference suppression function, electromagnetic interference suppression system, and electromagnetic interference suppression method thereof - Google Patents

Description

  The present invention relates to a mobile phone terminal with an electromagnetic interference suppression function, an electromagnetic interference suppression system, and an electromagnetic interference suppression method thereof.

  Conventionally, when a mobile phone is used, if there is a medical device such as a cardiac pacemaker nearby, the device may malfunction due to electromagnetic waves transmitted from the mobile phone. For this reason, it has become a etiquette not to use a mobile phone in an environment where an unspecified number of people are nearby such as in a hospital or on a train. However, there are cases where a mobile phone is used near a medical device without being noticed in a crowded city or a sightseeing spot. Therefore, as disclosed in Patent Document 1, there is a system that forcibly prohibits transmission from a mobile phone when a device identification signal is transmitted from a disturbed device such as a pacemaker by weak radio waves and received. Proposed.

  A conventional electromagnetic interference prevention system in a mobile phone terminal will be specifically described below with reference to FIG. FIG. 6 is a schematic configuration block diagram of an electromagnetic wave interference suppression system in a conventional mobile phone terminal. As shown in FIG. 6, the conventional electromagnetic interference suppression system for a mobile phone terminal includes an obstructed device identification signal transmitter 1, a mobile phone terminal 2, and a mobile phone base station 9. The mobile phone terminal 2 includes an antenna 3, an identification signal receiver 4, a control unit 5, a screen display unit 6, a communication transceiver unit 7, and an antenna 8.

The disturbing device identification signal generator 1 is arranged in the vicinity of a device such as a pacemaker that may malfunction due to electromagnetic waves from a mobile phone, and transmits the identification signal of the disturbed device by weak radio waves that do not affect the device. To do. When the identification signal receiver 4 included in the mobile phone terminal 2 detects the identification signal from the disturbed device via the antenna 3, the identification signal receiver 4 notifies the control unit 5. The control unit 5 displays on the screen display unit 6 that there is an obstructed device nearby, and stops transmission / reception from the communication transmitting / receiving unit 7. With the above operation, transmission of electromagnetic waves from the antenna 8 of the mobile phone terminal 2 to the mobile phone base station 9 is stopped, so that it is possible to prevent the disturbed device from malfunctioning due to the electromagnetic waves of the mobile phone.
JP 2002-218529 A

  However, in a system as disclosed in Patent Document 1, if a disturbed device identification signal is detected, the mobile phone communication is forcibly stopped, so that the user of the mobile phone terminal is suddenly disconnected and the convenience is increased. There was a problem of lacking. Further, when the disturbed device identification signal is abused, an emergency call to the police, fire fighting or the like by a mobile phone can be intentionally interrupted, resulting in a problem of lack of publicity.

  In view of the above problems, the present invention detects the direction in which a disturbed device exists by receiving identification signals from a disturbed device that may be subject to electromagnetic interference from a plurality of directional antennas, Controlling the transmission direction of the directional antenna so as not to affect the disturbed device, and further reducing the transmission power by controlling the communication speed according to the electric field strength of the received identification signal. An object of the present invention is to provide a mobile phone terminal with an electromagnetic interference suppression function, an electromagnetic interference suppression system, and an electromagnetic interference suppression method thereof capable of suppressing electromagnetic interference to a disturbed device without impairing the convenience of the user. To do.

In order to achieve the above object, according to a first aspect of the present invention, an identification signal transmitted from an obstructed device identification signal transmitter provided in an obstructed device subject to electromagnetic wave interference is transmitted as a plurality of directivities. A directional antenna unit that receives the antenna unit and detects the direction of presence of the disturbed device and a directional antenna unit having a minimum received electric field strength of the identification signal are selected from the plurality of directional antenna units. By using the antenna selector and the directional antenna unit selected by the antenna selector, the presence direction of the disturbed device detected by the direction detecting means is avoided, and the affected device is affected by electromagnetic waves. an electromagnetic wave emission means for emitting an electromagnetic wave in a direction which does not give the mobile phone terminal with electromagnetic interference suppression function, characterized by comprising It is intended to provide.

In order to achieve the above object, as a second aspect, the present invention provides a disturbed device identification signal transmission that is provided in a disturbed device that is subject to electromagnetic wave interference and that transmits an identification signal for identifying the disturbed device. The present invention provides an electromagnetic wave interference suppression system characterized by comprising a machine and a mobile phone terminal with an electromagnetic wave interference suppression function .

In order to achieve the above object, according to a third aspect of the present invention, there is provided, as a third aspect, that the direction detecting means of the mobile phone terminal with an electromagnetic wave interference suppressing function is identified as an obstructed device provided in the disturbed device subject to electromagnetic wave interference A direction detection step of receiving an identification signal transmitted from a signal transmitter by a plurality of directional antenna units and detecting a presence direction of the disturbed device, and from among the plurality of directional antenna units, By selecting a directional antenna unit having a minimum received electric field intensity and using the selected directional antenna unit, the presence direction of the disturbed device detected by the direction detecting step is avoided, and an electromagnetic wave An electromagnetic wave emission step in which the electromagnetic wave emission means of the mobile phone terminal with an interference prevention function emits an electromagnetic wave in a direction not affecting the disturbed device by the electromagnetic wave, There is provided an electromagnetic wave interference suppression method of electromagnetic interference suppression function-equipped cellular phone terminal, characterized by.

In order to achieve the above object, according to a fourth aspect of the present invention, there is provided, as a fourth aspect, a disturbed device identification signal transmission that is provided in a disturbed device subject to electromagnetic interference and that transmits an identification signal for identifying the disturbed device. And a mobile phone terminal for receiving the identification signal, wherein the direction detection means of the mobile phone terminal receives the identification signal by a plurality of directional antenna units. And selecting a directional antenna unit having a minimum received electric field strength of the identification signal from the direction detecting step of detecting the presence direction of the disturbed device and the plurality of directional antenna units. By using a directional antenna unit, avoiding the presence direction of the disturbed device detected by the direction detection step, the electromagnetic wave of the mobile phone terminal Detection means is intended to provide electromagnetic interference suppression method of electromagnetic interference suppression system characterized by having, an electromagnetic wave emission step of emitting an electromagnetic wave in a direction that does not affect by electromagnetic waves to said interfering instrument.

  According to the present invention, by receiving identification signals from a disturbed device that may be subject to electromagnetic interference from a plurality of directional antennas, the direction in which the disturbed device exists is detected, and the disturbed device is affected. The transmission direction of the directional antenna is controlled so that the transmission power can be reduced by controlling the communication speed according to the electric field strength of the received identification signal, and the convenience of the mobile phone terminal user is impaired. In addition, it is possible to realize a mobile phone terminal with an electromagnetic wave interference suppression function, an electromagnetic wave interference suppression system, and an electromagnetic wave interference suppression method thereof that can suppress electromagnetic interference to a disturbed device.

  In the best mode for carrying out the present invention, an identification signal transmitted from an obstructed device identification signal transmitter provided in an obstructed device subject to electromagnetic wave interference is transmitted to a mobile phone terminal by a plurality of directional antennas. Direction detecting means for detecting the direction of presence of the disturbed device received by the unit, and avoiding the presence direction of the disturbed device detected by the direction detecting means, and affecting the disturbed device by electromagnetic waves Provided with electromagnetic wave emitting means for emitting electromagnetic waves in a non-directional direction.

  Preferred embodiments of the present invention will be described below in detail with reference to the accompanying drawings. The embodiments described below are preferable specific examples of the present invention, and thus various technically preferable limitations are given. However, the scope of the present invention is particularly limited in the following description. Unless otherwise described, the present invention is not limited to these embodiments.

(Embodiment 1)
This embodiment detects the direction in which a disturbed device exists by receiving identification signals from a plurality of directional antennas from a disturbed device that may be subjected to electromagnetic interference such as a cardiac pacemaker in a mobile phone terminal. The transmission direction of the directional antenna is controlled so as not to affect the disturbed device, and the transmission power can be reduced by controlling the communication speed according to the electric field strength of the received identification signal. It is characterized by.

  The schematic configuration of the electromagnetic wave interference suppression system of the present embodiment and the function of each part will be described below with reference to FIG. FIG. 1 is a schematic block diagram of an electromagnetic wave interference suppression system according to this embodiment. As shown in FIG. 1, the electromagnetic wave interference suppression system of this embodiment includes a mobile phone terminal 20, a disturbed device identification signal transmitter 21, and mobile phone base stations 22, 23, and 24. The mobile phone terminal 20 includes a directional antenna unit 10, 11, 12, an omnidirectional antenna unit 13, an antenna selector 14, a communication transceiver unit 15, a transmission speed calculation unit 16, a control unit 17, a screen display unit 18, And a speaker 19.

  As shown in FIG. 1, the mobile phone terminal 20 has a plurality of directional antenna units 10, 11, 12 and one omnidirectional antenna unit 13, and each of the directional antenna units 10, 11, 12 is It is arranged to transmit and receive radio waves of different directions. These directional antenna units 10, 11, and 12 receive the disturbed device identification signal transmitted from the disturbed device identification signal transmitter 21 carried by the owner of the pacemaker and the like. Outputs received field strength.

  When the antenna selector 14 detects the disturbed device identification signal, the antenna selector 14 assigns the number of the directional antenna unit (any one of the directional antenna units 11, 12, and 13 in FIG. 1) having the minimum received electric field strength of the identification signal. The communication transceiver 15 and the selected directional antenna unit are connected.

When none of the directional antenna units 11, 12, 13 detects the disturbed device identification signal, the omnidirectional antenna unit 13 and the communication transceiver 15 are connected.
Further, the antenna selector 14 notifies the control unit 17 of the minimum value of the identification signal reception electric field strengths output from the plurality of directional antenna units (the directional antenna units 11, 12, and 13 in FIG. 1).

Further, the transmission rate calculation unit 16 selects the transmission rate according to the received electric field strength of the disturbed device identification signal input from the control unit 17 and notifies the control unit 17 in order to reduce the transmission power required for communication. To do.
The control unit 17 uses the notified transmission speed and the selected antenna unit (in FIG. 1, any one of the directional antenna units 11, 12, and 13) to select one of the mobile phone base stations 22, 23, and 24. Communicate with the base station in the direction that has the least influence on the disturbed device.

In addition, the control unit 17 displays a message on the screen display unit 18 indicating that a medical device or the like affected by electromagnetic waves has been detected. Further, during a voice call, a warning sound is generated from the speaker 19 to notify the user of the mobile phone terminal 20 that the disturbed device is nearby.
In this way, in the present embodiment, the transmission power is reduced by suppressing the emission of electromagnetic waves from the mobile phone terminal 20 in the direction where there is a disturbed device that may be affected by the electromagnetic interference and controlling the transmission speed. Therefore, even when there is a disturbed device such as a medical device near the mobile phone user, communication can be maintained without causing electromagnetic interference.

  Next, the configuration and function of the directional antenna units 10, 11, and 12 shown in FIG. 1 will be described with reference to FIG. FIG. 2 is a configuration block diagram of the directional antenna units 10, 11, and 12 of the mobile phone terminal 20 of the present embodiment. In FIG. 2, the detailed structure per one of the directional antenna units 10, 11, and 12 shown in FIG. 1 is shown. In FIG. 2, the directional antenna 25 included in the directional antenna units 10, 11, and 12 can receive only a disturbed device identification signal that has arrived from a range within about 60 ° from the specific direction axis.

The disturbed device identification signal receiver 26 amplifies the identification signal received by the directional antenna 25 and outputs the identification signal electric field strength E (n). Here, n is a number for identifying the unit.
The directional antenna 27 is a transmission / reception antenna for performing mobile phone communication, and has directivity in the same direction as the directional antenna 25 for receiving an identification signal from the disturbed device. A communication reception signal is output from the communication antenna duplexer 28, and a communication transmission signal is input.

  Next, the configuration and function of the omnidirectional antenna unit 13 shown in FIG. 1 will be described with reference to FIG. FIG. 3 is a configuration block diagram of the omnidirectional antenna unit 13 of the mobile phone terminal 20 of the present embodiment. FIG. 3 shows a detailed configuration of the omnidirectional antenna unit 13 shown in FIG. In FIG. 3, an antenna 29 included in the omnidirectional antenna unit 13 is an antenna configured to perform transmission and reception evenly in all directions. The communication antenna duplexer 30 connected to the antenna 29 is the same as the antenna duplexer 28 in FIG. A communication reception signal is output from the communication antenna duplexer 30 and a communication transmission signal is input.

  1 shows a case where three directional antenna units 10, 11, and 12 are arranged for the sake of simplicity, but the number may not be three as long as there are a plurality. Further, regarding the configuration of the directional antennas 10, 11, 12 themselves, the configuration of the omnidirectional antenna 13 itself, and the identification signal transmitter 21 of the disturbed device, several means are known to those skilled in the art. Further, since it is not directly related to the present embodiment, its detailed configuration is omitted.

Next, the operation of the electromagnetic wave interference suppression system in the mobile phone terminal 20 of the present embodiment shown in FIG. 1 will be described below mainly using the flowchart shown in FIG. FIG. 4 is a flowchart for explaining the operation of the electromagnetic wave interference suppression system of this embodiment.
First, when receiving the identification signal from the disturbed device (step 11: Y), the antenna selector 14 shown in FIG. 1 receives the identification signal reception electric field strength E (output from each directional antenna unit 10, 11, 12). n). Here, n indicates a unit number, and when the number of units N is 3, as shown in FIG. 1, n = 1, 2, 3 (step 12).

  Next, the antenna selector 14 selects the unit number m having the smallest identification signal reception electric field strength E (n) as a communication antenna, connects the communication transceiver 15 of FIG. 1 and the directional antenna unit m, 1 is notified of the received electric field strength E (m) in the selected unit (step 13). When notified of the received electric field strength E (m) via the control unit 17, the transmission speed calculation unit 16 in FIG. 1 transmits the preset E (m) and the transmission as in the example shown in FIG. The transmission rate R is calculated using a table showing the relationship of the communication rate R on the side, and after notifying the control unit 17, communication with the mobile phone base station is executed at the transmission rate R (step 14).

  Here, in the mobile phone system, for example, the transmission power required for a lower communication speed is often reduced, such as Gain Factor defined in 3GPP (3rd Generation Partnership Project) TS25.214. Thus, the influence of electromagnetic waves on the disturbed device can be reduced.

Further, the control unit 17 shown in FIG. 1 displays a message on the screen display unit 18 in FIG. 1 stating that “a device that may malfunction due to a mobile phone is detected nearby, so that the communication speed is limited.” The information is displayed and notified to the user of the mobile phone terminal 20 (step 15).
If the user of the mobile phone terminal 20 is performing voice communication (step 16: Y), a warning sound may be generated from the speaker 19 shown in FIG. 1 because the message displayed on the screen may not be seen. Thus, the user of the mobile phone terminal 20 is notified that the disturbed device signal has been detected (step 17).

  If none of the directional antenna units 10, 11, and 12 shown in FIG. 1 detects an obstructed device identification signal (step 11: N), the above-mentioned screen display and the warning sound from the speaker are stopped ( Step 18), the omnidirectional antenna unit 13 shown in FIG. 1 is connected as a communication antenna and the communication transceiver 15 to communicate with the mobile phone base station (Step 19). By repeating the above operation at regular intervals, communication of the mobile phone terminal 20 can be maintained while always emitting electromagnetic waves in a direction that minimizes the influence on the disturbed device.

  In the process of step 14 shown in FIG. 4, the directional antenna unit having the smallest received electric field strength of the identification signal is not selected, and the antenna unit farthest from the electromagnetic wave radiation direction of the directional antenna having the largest received electric field strength is selected. You may make it do.

As described above, the present embodiment has the following effects.
The first effect is that, since it has a plurality of directional antenna units, it is possible to detect the direction of arrival of the disturbed device identification signal transmitted from a cardiac pacemaker or the like and the received electric field strength.
The second effect is that there is means for automatically selecting a directional antenna unit that transmits an electromagnetic wave in a direction that is not the arrival direction of the disturbed device identification signal, so communication with a mobile phone is continued. Even in this case, it is possible to prevent peripheral devices from malfunctioning.

The third effect is that there is means for limiting the transmission data rate of the mobile phone in accordance with the received electric field strength of the disturbed device identification signal. It is possible to reduce the influence of electromagnetic waves.
The fourth effect is that there is a means for notifying a mobile phone user by a screen display and a warning sound from a speaker when an obstructed device identification signal is detected. You can be conscious not to do it.

It is a schematic block diagram of the electromagnetic wave interference suppression system of this embodiment. It is a block diagram of the configuration of the directional antenna units 10, 11, 12 of the mobile phone terminal 20 of the present embodiment. It is a block diagram of the configuration of the omnidirectional antenna unit 13 of the mobile phone terminal 20 of the present embodiment. It is a flowchart for demonstrating operation | movement of the electromagnetic wave interference suppression system of this embodiment. It is the figure which showed the table which shows the relationship between the reception electric field strength E (m) of the obstructed apparatus identification signal set beforehand and the communication speed R of the transmission side which the mobile telephone terminal 20 of this embodiment has. It is a schematic block diagram of the conventional electromagnetic wave interference suppression system.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Interfering apparatus identification signal transmitter 2 Mobile phone terminal 3 Antenna 4 Identification signal receiver 5 Control part 6 Screen display part 7 Communication transmission / reception part 8 Antenna 9 Mobile phone base station 10, 11, 12 Directional antenna unit 13 Non-directional Antenna unit 14 antenna selector 15 transmission / reception unit 16 transmission speed calculation unit 17 control unit 18 screen display unit 19 speaker 20 mobile phone terminal 21 disturbed device identification signal transmitter 22, 23, 24 mobile phone base station 25 directional antenna 26 Interfering Device Identification Signal Receiver 27 Directional Antenna 28 Communication Antenna Duplexer 29 Antenna 30 Communication Antenna Duplexer

Claims (18)

Direction detection for detecting the presence direction of the disturbed device by receiving the identification signals transmitted from the disturbed device identification signal transmitter provided in the disturbed device subject to electromagnetic interference by a plurality of directional antenna units. Means,
An antenna selector that selects a directional antenna unit having a minimum received electric field intensity of the identification signal from the plurality of directional antenna units;
By using the directional antenna unit selected by the antenna selector, the presence direction of the disturbed device detected by the direction detecting means is avoided, and the disturbed device is not affected by electromagnetic waves. Electromagnetic wave emitting means for emitting electromagnetic waves;
A mobile phone terminal with an electromagnetic wave interference suppressing function.   The electromagnetic wave interference suppressing function according to claim 1, wherein identification signal receiving directional antennas respectively provided in the plurality of directional antenna units are arranged so that the identification signals arriving from an arbitrary direction can be received. Mobile phone terminal. Each of the plurality of directional antenna units includes an identification signal receiving antenna that receives the identification signal and a communication antenna, and the identification signal receiving directional antenna and the communication directional antenna are in the same direction. 3. The mobile phone terminal with an electromagnetic wave interference suppressing function according to claim 1 , wherein the mobile phone terminal has directivity. Selecting the most suitable mobile phone base station in a direction that does not affect the disturbed device by electromagnetic waves, and performing communication with the mobile phone base station using the selected directional antenna unit. The mobile phone terminal with an electromagnetic wave interference suppressing function according to any one of claims 1 to 3 . A transmission speed corresponding to the value of the received electric field strength output from the selected directional antenna unit is specified, and the mobile phone terminal and the mobile phone are used at the transmission speed by using the selected directional antenna unit. 5. The mobile phone terminal with an electromagnetic interference suppression function according to claim 4 , wherein communication is performed with a base station. The transmission power from the mobile phone terminal to the mobile phone base station is suppressed in the communication executed at the specified transmission speed using the selected directional antenna unit. mobile phone terminal with electromagnetic interference suppression function of claim 5, wherein. When the identification signal is received by the directional antenna unit and the presence of the disturbed device is confirmed, a message indicating that the disturbed device is detected is displayed on the display screen of the mobile phone terminal. A mobile phone terminal with an electromagnetic wave interference suppressing function according to any one of claims 1 to 6 . Wherein said identification signal by the directional antenna unit is received, the case where the presence of the interfering device has been confirmed, one of claims 1 to 7, characterized in that for generating a warning sound from the speaker of the mobile phone terminal A mobile phone terminal with an electromagnetic wave interference suppressing function according to claim 1. A disturbed device identification signal transmitter that is provided in a disturbed device that is subject to electromagnetic interference and transmits an identification signal that identifies the disturbed device;
An electromagnetic interference suppression system comprising: the mobile phone terminal according to any one of claims 1 to 8 . The direction detection means of the mobile phone terminal with the electromagnetic wave interference suppression function receives the identification signal transmitted from the disturbed device identification signal transmitter provided in the disturbed device subject to the electromagnetic interference by a plurality of directional antenna units. And a direction detection step of detecting the presence direction of the disturbed device,
Detecting by the direction detecting step by selecting a directional antenna unit having a minimum received electric field strength of the identification signal from the plurality of directional antenna units and using the selected directional antenna unit. The electromagnetic wave emission means for avoiding the presence direction of the disturbed device, the electromagnetic wave emission means of the mobile phone terminal with an electromagnetic wave interference suppressing function, emitting electromagnetic waves in a direction not affecting the disturbed device by electromagnetic waves,
An electromagnetic wave interference suppressing method for a mobile phone terminal with an electromagnetic wave interference suppressing function, comprising: 11. The electromagnetic wave interference suppressing function according to claim 10 , wherein identification signal receiving directional antennas respectively provided in the plurality of directional antenna units are arranged so that the identification signals arriving from an arbitrary direction can be received. A method for suppressing electromagnetic interference in mobile phone terminals. Each of the plurality of directional antenna units includes an identification signal receiving antenna that receives the identification signal and a communication antenna, and the identification signal receiving directional antenna and the communication directional antenna are in the same direction. 12. The method for suppressing electromagnetic interference of a mobile phone terminal with an electromagnetic interference suppression function according to claim 10 or 11 , characterized by having directivity. Selecting the most suitable mobile phone base station in a direction that does not affect the disturbed device by electromagnetic waves, and performing communication with the mobile phone base station using the selected directional antenna unit. The method for suppressing electromagnetic interference of a mobile phone terminal with an electromagnetic interference suppression function according to any one of claims 10 to 12 . A transmission speed corresponding to the value of the received electric field strength output from the selected directional antenna unit is specified, and the mobile phone terminal and the mobile phone are used at the transmission speed by using the selected directional antenna unit. 14. The method for suppressing electromagnetic interference of a mobile phone terminal with an electromagnetic interference suppression function according to claim 13 , wherein communication is performed with a base station. The transmission power from the mobile phone terminal to the mobile phone base station is suppressed in the communication executed at the specified transmission speed using the selected directional antenna unit. Item 15. A method for suppressing electromagnetic interference in a mobile phone terminal with an electromagnetic interference suppression function according to Item 14 . When the identification signal is received by the directional antenna unit and the presence of the disturbed device is confirmed, a message indicating that the disturbed device is detected is displayed on the display screen of the mobile phone terminal. The method for suppressing electromagnetic interference of a mobile phone terminal with an electromagnetic interference suppression function according to any one of claims 10 to 15 . 11. The method according to claim 10 , further comprising a step of generating a warning sound from a speaker of the mobile phone terminal when the identification signal is received by the directional antenna unit and the presence of the disturbed device is confirmed. An electromagnetic wave interference suppressing method for a mobile phone terminal with an electromagnetic wave interference suppressing function according to any one of 16 . Electromagnetic interference suppression comprising a disturbed device identification signal transmitter that is provided in a disturbed device subject to electromagnetic interference and that transmits an identification signal for identifying the disturbed device, and a mobile phone terminal that receives the identification signal A method for suppressing electromagnetic interference in a system,
A direction detecting step in which the direction detection means of the mobile phone terminal receives the identification signal by a plurality of directional antenna units, and detects the presence direction of the disturbed device,
The direction detecting step detects the directional antenna unit having the minimum received electric field strength of the identification signal from the plurality of directional antenna units, and using the selected directional antenna unit. In addition, avoiding the presence direction of the disturbed device, the electromagnetic wave emission means of the mobile phone terminal emits an electromagnetic wave in a direction that does not affect the disturbed device by the electromagnetic wave, and
An electromagnetic interference suppression method for an electromagnetic interference suppression system characterized by comprising:

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