Mobile radio communication system and portable radio communication terminal of mobile radio communication system

The present invention relates to a mobile wireless communication system, more specifically, a mobile wireless communication system capable of limiting the transmission power of a mobile wireless communication terminal in a specific area, and a portable radio of such a mobile wireless communication system. Regarding communication terminals.

Conventionally, in a cell-type mobile wireless communication system represented by a mobile phone, the transmission power of the mobile wireless communication terminal is controlled by a transmission power control signal received from the base station by the mobile wireless communication terminal. Therefore, as shown in FIG. 1, when the mobile wireless communication terminal is outdoors and receives a transmission power control signal from an outdoor base station, or even if it is indoors, there is no indoor base station and the outdoor base station In the case of receiving the transmission power control signal of, for example, the shorter the distance from the base station to the mobile wireless communication terminal, the smaller the transmission power of the mobile wireless communication terminal is controlled. On the other hand, when the mobile wireless communication terminal is indoors and there is an indoor small base station nearby, it is controlled by the transmission power control signal received from the indoor small base station. Generally, the transmission power set by the transmission power control signal from the small indoor base station is smaller than that from the outdoor base station.

When there are a plurality of independent wireless LAN networks on one indoor floor, a technique for reducing electromagnetic interference between them is known (see, for example, Patent Document 1). Patent Document 1 discloses that the radio wave propagation characteristics between a base station and a terminal station are obtained by simulation, and a counter having a radio wave absorption function is arranged at a position where radio wave absorption is required based on the obtained radio wave propagation characteristics. are doing.

Further, a technique of controlling transmission power by a channel for transmitting transmission power control information between two wireless communication devices is also known. (Refer to Patent Document 2.) Further, a technique for adjusting the strength of a transmission signal of a mobile wireless communication terminal according to the reception strength of a signal transmitted from a base station is also known. (See Patent Document 3.)

<patcit num="1"><text>JP 2001-168812 (Claim 1, Abstract)</text></patcit><patcit num="2"><text>Japanese Patent Application Laid-Open No. 2006-197318 (Summary)</text></patcit><patcit num="3"><text>JP-A-11-355205 (Claim 1, Abstract)</text></patcit>

<p> However, as shown in FIG. 2, for example, a mobile wireless communication terminal may be located near an indoor window and receive a transmission power control signal from an outdoor base station among a small indoor base station and an outdoor base station. Since the mobile wireless communication terminal does not have a function of determining whether or not there is a precision electric device nearby, transmission is performed with a relatively large amount of power according to a transmission power control signal from an outdoor base station. Therefore, when there is a precision electric device such as a medical electric device indoors, electromagnetic interference may occur due to the radio wave transmitted from the portable wireless communication terminal. The possibility of such electromagnetic interference increases as the radio wave received from the portable wireless communication terminal by the precision electric device becomes stronger. For this reason, in facilities where it is necessary to prevent electromagnetic interference with precision electrical equipment, such as in hospitals, the use of mobile wireless communication terminals is prohibited not only around the precision electrical equipment but also in buildings, rooms, or the entire specific space. We are dealing with.</p><p> The technology disclosed in Patent Document 1 addresses the problem of electromagnetic interference in wireless communication by setting up a tsuitate. Such a tsuitate is effective in preventing electromagnetic interference, but may be difficult to implement, such as when there is not enough space in the room.</p><p> Further, the technology disclosed in Patent Document 2 is to send a transmission power control signal at the same time as packet transmission between two mobile wireless communication terminals, while the technology disclosed in Patent Document 3 is a mobile wireless communication terminal and a base. The transmission power is controlled according to the reception level of the data signal with the station. Therefore, neither is intended to reduce electromagnetic interference with surrounding precision electrical equipment.</p><p> The present invention has been made in view of such a problem, and an object of the present invention is to make it possible to reduce electromagnetic interference to other precision electric devices by radio waves of a mobile wireless communication terminal.</p>

<p> In order to achieve such an object, the invention according to claim 1 is a mobile wireless communication system that can be connected to an external communication network via a base station, and is a tag that can be attached to an external electric device. And a portable wireless communication terminal that can be connected to an external communication network via a base station. The tag has a first signal transmitting means for transmitting the first signal. The mobile wireless communication terminal is connected to a mobile wireless communication terminal control means, a wireless transmission means that is connected to the mobile wireless communication terminal control means and sends a data signal to the base station, and is connected to the mobile wireless communication terminal control means. It has a first signal receiving means for receiving the first signal transmitted by the first signal transmitting means of the tag. The mobile wireless communication terminal control means is characterized in that the maximum transmission output of the data signal of the wireless transmission means is limited based on the proximity information between the tag and the mobile wireless communication terminal obtained from the first signal. To do.</p><p> Here, the proximity information is information indicating the degree to which the mobile wireless communication terminal is close to the tag, and it is desirable that the closer the mobile wireless communication terminal is, the lower the transmission power of the mobile wireless communication terminal is limited. .. With this configuration, the maximum transmission output of the mobile wireless communication terminal can be controlled according to how close the tag and the mobile wireless communication terminal are.</p><p> The invention according to claim 2 is the mobile wireless communication system according to claim 1, wherein the mobile wireless communication terminal control means is transmitted by the first signal transmitting means at a fixed level and the first signal receiving means. The approach degree information is obtained based on the first signal received by the user, and the approach degree information is the reception level of the first signal received by the first signal receiving means.</p><p> In this configuration, the degree of proximity between the tag and the mobile wireless communication terminal is represented by the reception level of the first signal received from the tag. Thereby, the maximum transmission output of the mobile wireless communication terminal can be controlled according to how close the tag and the mobile wireless communication terminal are.</p><p> The invention according to claim 3 is the mobile wireless communication system according to claim 1 or 2, wherein the first signal is any one of a marker radio signal, an ultrasonic signal, and an optical signal. The tags are a second signal transmitting means for transmitting a second signal, which is one of a marker radio signal, an ultrasonic signal, and an optical signal, a second signal receiving means for receiving a reflected wave of the second signal, and a second signal receiving means for receiving the reflected wave of the second signal. The second signal receiving means further includes a tag control unit for determining whether or not the reflected wave of the second signal is received at a predetermined threshold level or higher, and the tag control unit receives the reflected wave of the second signal at a constant threshold value. It is characterized in that the first signal is transmitted from the first signal transmitting means when it is determined that the signal has been received at a level or higher.</p><p> In this configuration, when the reflected wave of the second signal transmitted from the tag is received at a certain value or more, it is determined that the tag and the mobile wireless communication terminal are close to each other. As a result, the first signal is transmitted, and the maximum transmission output of the mobile wireless communication terminal is controlled by the reception level of the first signal. Thereby, the maximum transmission output of the mobile wireless communication terminal can be controlled according to how close the tag and the mobile wireless communication terminal are.</p><p> The invention according to claim 4 is the mobile wireless communication system according to claim 1, wherein the first signal is any one of a marker radio signal, an ultrasonic signal, and an optical signal, and the tag is , A second signal transmitting means for transmitting a second signal, which is one of a marker radio signal, an ultrasonic signal, and an optical signal, to the portable wireless communication terminal, and a second signal for receiving the reflected wave of the second signal. The first signal transmitting means further includes a receiving means and a distance calculating means for obtaining distance information between the tag and the portable wireless communication terminal based on the second signal and the reflected wave of the second signal. , The first signal indicating the distance information calculated by the distance calculation means is transmitted, and the approach degree information is the distance information.</p><p> In this configuration, when the reflected wave of the second signal transmitted from the tag is received at a certain value or more, the distance between the tag and the portable wireless communication terminal is calculated based on, for example, the time difference between the transmission and reception of the second signal. This distance information is transmitted as a first signal, and the maximum transmission output of the mobile wireless communication terminal is controlled by the distance information. Thereby, the maximum transmission output of the mobile wireless communication terminal can be controlled according to how close the tag and the mobile wireless communication terminal are.</p><p> The invention according to claim 5 is the mobile wireless communication system according to claim 1, wherein the first signal is any one of a marker radio wave signal, an ultrasonic signal, and an optical signal, and the tag is Further, there is a second signal transmitting means for transmitting a second signal, which is one of a marker radio signal, an ultrasonic signal, and an optical signal and has a propagation speed different from that of the first signal, to the mobile wireless communication terminal. Then, the mobile wireless communication terminal is a distance between the tag and the mobile wireless communication terminal based on the reception time difference between the first signal and the second signal between the second signal receiving means for receiving the second signal. It further includes a distance calculating means for obtaining information and transmitting the information to the portable wireless communication terminal control means, and the approach degree information is the distance information.</p><p> In this configuration, the distance between the tag and the mobile wireless communication terminal is calculated based on the reception time difference between the first and second signals transmitted from the tag. The maximum transmission output of the mobile wireless communication terminal is controlled by this distance information. Thereby, the maximum transmission output of the mobile wireless communication terminal can be controlled according to how close the tag and the mobile wireless communication terminal are.</p><p> The invention according to claim 6 is the mobile wireless communication system according to any one of claims 1 to 5, wherein the tag controls transmission of a first signal from the first signal transmitting means. The tag control means further includes a device information storage memory connected to the tag control means and storing device information about an external electric device to which the tag can be arranged in close proximity, and the tag control means stores the device information. The mobile wireless communication terminal further includes device information detecting means for transmitting to the mobile wireless communication terminal together with the first signal and detecting the device information, and the mobile wireless communication terminal control means has the proximity information and the device information. The maximum output of the data signal transmission of the wireless transmission means is limited based on the above.</p><p> In this configuration, the tag further transmits information about the external precision electrical device to the portable wireless communication terminal. This device information indicates, for example, the radio wave immunity level of an external precision electric device, and the device information can also be considered for the maximum transmission output control of the portable wireless communication terminal.</p><p> The invention according to claim 7 is the mobile wireless communication system according to any one of claims 1 to 6, wherein the first signal is a marker radio wave signal.</p><p> The invention according to claim 8 is the mobile wireless communication system according to any one of claims 5 to 7, wherein any one of the first and second signals is an ultrasonic signal. It is characterized by being.</p><p> The invention according to claim 9 is the mobile wireless communication system according to any one of claims 1 to 6 and 8, wherein the first signal is an ultrasonic signal or an optical signal, and the tag or the said. The first signal receiving means of the mobile wireless communication terminal receives the first signal via the first signal antenna, and the tag having the first signal receiving means or the portable wireless communication terminal is the first signal antenna. It is characterized by further having a metal shield covering the above.</p><p> With this configuration, it is possible to further reduce electromagnetic interference with external precision electric equipment, and further, it is possible to make the first signal less susceptible to the influence of external radio waves.</p><p> The invention according to claim 10 is the mobile wireless communication system according to any one of claims 3 to 6 and 8 to 9, wherein the second signal is an ultrasonic signal or an optical signal, and the tag. Alternatively, the second signal receiving means of the mobile wireless communication terminal receives the second signal via the second signal antenna, and the tag or the portable wireless communication terminal having the second signal receiving means is the second. It is characterized by further having a metal shield covering the signal antenna.</p><p> With this configuration, it is possible to further reduce electromagnetic interference with external precision electric equipment, and further, it is possible to make the second signal less susceptible to the influence of external radio waves.</p><p> The invention according to claim 11 is a portable wireless communication terminal that can be connected to an external communication network via a base station and can receive first and second signals from a tag attached to an external electric device. A first, which is one of a wireless transmission means for transmitting a data signal to a base station, a wireless reception means for receiving a data signal from the base station, and a marker radio signal, an ultrasonic signal, and an optical signal from the tag. A first signal receiving means for receiving a signal and a second signal from the tag, which is one of a marker radio signal, an ultrasonic signal, and an optical signal and has a propagation speed different from that of the first signal. The distance information between the portable wireless communication terminal and the tag is obtained based on the reception time difference between the second signal receiving means and the first and second signals to be received, and the wireless transmitting means of the wireless transmitting means is obtained based on the distance information. It is characterized by being provided with a control means for limiting the maximum output when transmitting a data signal.</p>

<p> By installing the tag at a desired place by the mobile wireless communication system having the configuration of the present invention, the transmission power of the portable wireless communication terminal can be limited around the tag. Thereby, for example, by attaching the tag to the precision electric device, it is possible to reduce the electromagnetic interference given to the precision electric device by the portable wireless communication terminal.</p>

Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. &lt;First Example&gt; A schematic diagram of the mobile wireless communication system 100 according to the first embodiment of the present invention is shown in FIG.

The mobile wireless communication system 100 has a tag 110 attached to a precision electric device or the like, and a mobile wireless communication mobile terminal 120 such as a mobile phone.

The tag 110 has a control circuit 111, a marker radio wave transmission circuit (an example of a first signal transmission means) 112 connected to the control circuit 111, and a marker radio wave transmission antenna 113 connected to the marker radio wave transmission circuit 112. The control circuit 111 generates a marker radio wave (an example of the first signal), and emits a marker radio wave from the marker radio wave transmission circuit 112 via the marker radio wave transmission antenna 113 at a fixed level. Here, it is desirable that the marker radio wave emitted from the tag 110 is weak so as not to give electromagnetic interference to the precision electric device itself.

The portable wireless communication terminal 120 includes a control circuit 121, a wireless transmission circuit (an example of a wireless transmission means) 122, a wireless reception circuit (an example of a wireless reception means) 123, an antenna sharing circuit 124, a wireless network transmission / reception antenna 125, and the like. It has a marker radio wave receiving circuit (an example of the first signal receiving means) 126, a marker radio wave receiving antenna 127, and a display circuit external connection circuit 128. The wireless transmission circuit 122 and the wireless reception circuit 123 are connected to the control circuit 121, and transmit and receive data signals to and from the base station via the wireless network transmission / reception antenna 125 and the antenna sharing circuit 124. The display circuit external connection circuit 128 connects the control circuit 121 to an external display device such as a display.

The mobile wireless communication terminal 120 controls the transmission power based on the transmission power control signal received from the base station while the marker radio wave is not received, but the marker radio wave receiving circuit 126 passes through the marker radio wave receiving antenna 127. When the marker radio wave is received, the reception level of the marker radio wave (an example of proximity information) is determined, and the transmission power control is performed by using this reception level in preference to the transmission power control signal from the base station. The control circuit 121 includes a table showing the correlation between the reception level of the marker radio wave and the transmission power control value of the mobile wireless communication terminal 120 as shown in FIGS. 4, 5 and 6, and the mobile wireless communication terminal 120 has data. The maximum transmission power when transmitting a signal to the base station is limited by the transmission power control value (portable wireless communication terminal transmission control power) shown in this table. The reception level of the marker radio wave and the transmission power control value of the mobile wireless communication terminal 120 generally have a negative correlation, and as shown in FIG. 4, the transmission power limit value is controlled to be linearly smaller as the reception level is higher. As shown in FIG. 5, the transmission power limit value may decrease stepwise as the reception level increases. Further, as shown in FIG. 6, the transmission power limit value may be constant regardless of the reception level.

The portable wireless communication terminal 120 shown in FIG. 3 has a marker radio wave receiving antenna 127 and a wireless network transmitting / receiving antenna 125 separately, and the marker radio wave received by the marker radio wave receiving antenna 127 is sent to the marker radio wave receiving circuit 126 in a wireless network. The data signals received by the transmission / reception antenna 125 are transmitted to the radio reception circuit 123, respectively. However, the portable wireless communication terminal 120 'as in the marker conductive shown in FIG. 7 and a wave receiving antenna and the radio network transceiver antenna one shared antenna 125' configured as an antenna sharing circuit 124 'is collected by a marker Telecommunications and Radio Network The data signal received from the antenna may be separated and transmitted to each of the marker radio wave receiving circuit 126 and the wireless receiving circuit 123. As a result, in any of the configurations of the mobile wireless communication terminals 120 and 120'shown in FIGS. 3 and 7, the reception level read by the marker radio wave receiving circuit 126 from the marker radio wave is transmitted to the control circuit 121, and the control circuit 121 uses the marker. The transmission power of the mobile wireless communication terminals 120 and 120'can be controlled according to the reception level of radio waves.

With the above configuration, the mobile wireless communication system of the present embodiment can limit the data signal transmission output for the wireless network of the mobile wireless communication terminal when the tag and the mobile wireless communication terminal come close to each other. This makes it possible to reduce electromagnetic interference with medical electrical equipment due to radio waves transmitted by a mobile wireless communication terminal, especially in a hospital.

&lt;Second Example&gt; A schematic diagram of the mobile wireless communication system 200 according to the second embodiment of the present invention is shown in FIG.

The mobile wireless communication system 200 has a tag 210 attached to a precision electric device or the like, and a mobile wireless communication mobile terminal 220 such as a mobile phone.

The tag 210 has a control circuit 211 and an ultrasonic oscillator circuit (another example of the first signal transmitting means) 212 connected to the control circuit 211. The control circuit 211 emits ultrasonic waves (another example of the first signal) from the ultrasonic oscillator circuit 212 at a fixed level. Here, the tag 210 may have a light emitting circuit instead of the ultrasonic oscillation circuit 212.

The portable wireless communication terminal 220 includes a control circuit 221, a wireless transmission circuit (an example of a wireless transmission means) 222, a wireless reception circuit (an example of a wireless reception means) 223, an antenna sharing circuit 224, a wireless network transmission / reception antenna 225, and the like. It has an ultrasonic receiver circuit (another example of the first signal receiving means) 226, an ultrasonic sensor 227, and a display circuit external connection circuit 228. The wireless transmission circuit 222 and the wireless reception circuit 223 are connected to the control circuit 221 and transmit / receive data signals to / from the base station via the wireless network transmission / reception antenna 225 and the antenna sharing circuit 224. The control circuit 221 determines the reception level of ultrasonic waves (another example of proximity information) sensed by the ultrasonic wave receiving circuit 226 via the ultrasonic sensor 127. The control circuit 221 includes a table showing the correlation between the ultrasonic reception level and the transmission power control value of the mobile wireless communication terminal 220 as shown in FIGS. 4, 5 and 6, and the mobile wireless communication terminal 220 has data. The maximum transmission power when transmitting a signal to the base station is limited by the transmission power control value shown in this table. The display circuit external connection circuit 228 connects the control circuit 221 to an external display device such as a display.

In this embodiment, when the tag 210 is provided with a light emitting circuit instead of the ultrasonic oscillation circuit 212, the portable wireless communication terminal 220 is provided with a light receiving element instead of the ultrasonic receiving circuit 226, and the control circuit 221 is provided with the received light. The maximum transmission power of the portable wireless communication terminal 220 is controlled based on the level.

With the above configuration, the mobile wireless communication system of the present embodiment can limit the data signal transmission output for the wireless network of the mobile wireless communication terminal when the tag and the mobile wireless communication terminal come close to each other.

&lt;Third Example&gt; A schematic diagram of the mobile wireless communication system 300 according to the third embodiment of the present invention is shown in FIG.

The mobile wireless communication system 300 has a tag 310 attached to a precision electric device or the like, and a mobile wireless communication mobile terminal 320 such as a mobile phone.

The tag 310 includes a control circuit 311 and a marker radio wave transmission circuit (another example of the first signal transmission means) 312 connected to the control circuit 311. The marker radio wave transmission antenna 313 and an ultrasonic oscillation circuit (second signal). It has an ultrasonic receiving circuit (an example of a second signal receiving means) 315, and an ultrasonic sensor 316. The control circuit 311 emits an ultrasonic wave from the ultrasonic oscillation circuit 314, and receives the reflected wave by the ultrasonic wave receiving circuit 315 via the ultrasonic sensor 316. The threshold value of the reflected wave is preset in the control circuit 311. When the ultrasonic wave receiving circuit 315 receives the reflected wave in an amount exceeding this threshold value, the marker radio wave transmitting circuit (an example of the first signal transmitting means) 312 is used as an external device. A marker radio wave (an example of the first signal) is transmitted as object detection information. Here, it is desirable that the marker radio wave emitted from the tag 310 is weak so as not to give electromagnetic interference to the precision electric device itself. Further, the tag 310 may have a light emitting circuit instead of the ultrasonic oscillation circuit 314, an optical receiving circuit instead of the ultrasonic receiving circuit 315, and a light receiving element instead of the ultrasonic sensor 316.

The configuration of the mobile wireless communication terminal 320 of this embodiment is the same as the configuration of the mobile wireless communication terminals 120 and 120'of FIG. 3 or FIG. As in the case of the first embodiment, the marker radio wave received by the mobile wireless communication terminal 320 is transmitted to the control circuit 321. The mobile wireless communication terminal 320 controls the transmission power based on the transmission power control signal received from the base station while the marker radio wave is not received, but the marker radio wave receiving circuit 326 passes through the marker radio wave receiving antenna 327. When the marker radio wave is received, the reception level of the marker radio wave (an example of proximity information) is determined, and the transmission power control is performed by using the marker radio wave in preference to the transmission power control signal from the base station. The transmission power control based on the reception level of the marker radio wave by the control circuit 321 is the same as the transmission power control by the control circuit 121 of the first embodiment.

With the above configuration, the mobile wireless communication system of the present embodiment can limit the data signal transmission output for the wireless network of the mobile wireless communication terminal when the tag and the mobile wireless communication terminal come close to each other.

&lt;Fourth Example&gt; A schematic diagram of the mobile wireless communication system 400 according to the fourth embodiment of the present invention is shown in FIG.

The mobile wireless communication system 400 has a tag 410 attached to a precision electric device or the like, and a mobile wireless communication mobile terminal 420 such as a mobile phone.

The tag 410 includes a control circuit 411, a marker radio wave transmitting circuit (first signal transmitting means) 412 connected to the control circuit 411, a marker radio wave transmitting antenna 413, and an ultrasonic oscillation circuit (second signal transmitting means) 414. It has an ultrasonic receiving circuit (second signal receiving means) 415, an ultrasonic sensor 416, and a distance calculation circuit 417. The tag 410 is similar to the tag 310 of the third embodiment, except that it further includes a distance calculation circuit 417 connected to the control circuit 410 and the ultrasonic receiving circuit 415.

The control circuit 411 emits an ultrasonic wave (an example of a second signal) from the ultrasonic oscillation circuit 414, and the reflected wave is received by the ultrasonic wave receiving circuit 415 via the ultrasonic sensor 416. The distance calculation circuit 417 measures the time difference between transmission and reception of the transmitted ultrasonic wave and the received reflected wave, and calculates the distance from the tag 410 to the foreign object based on the time difference. The calculated distance information is transmitted to the control circuit 411. The control circuit 411 has a table showing the correlation between the distance information and the transmission power control value of the mobile wireless communication terminal 420, and determines the maximum transmission power when the mobile wireless communication terminal 420 transmits a data signal to the base station. Limited by the transmission power control value shown in the table. The distance between the mobile wireless communication terminal 420 and the foreign object and the transmission power control value of the mobile wireless communication terminal 420 generally have a positive correlation. For example, as shown in FIG. 11, the power limit value becomes linear as the distance increases. Or, as shown in FIG. 12, the transmission power limit value increases stepwise as the distance increases. Further, as shown in FIG. 13, the transmission power limit value may be constant regardless of the distance. This transmission power limit value is transmitted from the marker radio wave transmission circuit 412 as a marker radio wave (an example of the first signal).

Here, it is desirable that the marker radio wave emitted from the tag 410 is weak so as not to give electromagnetic interference to the precision electric device itself. Further, the tag 410 may have a light emitting circuit instead of the ultrasonic oscillation circuit 414, an optical receiving circuit instead of the ultrasonic receiving circuit 415, and a light receiving element instead of the ultrasonic sensor 416.

The configuration of the portable wireless communication terminal 420 of this embodiment is the same as that of the portable wireless communication terminal 120 of FIG. 3, and the control circuit 421, the wireless transmission circuit (an example of the wireless transmission means) 422, and the wireless reception circuit (of the wireless reception means) Example) 423, an antenna shared circuit 424, a wireless network transmission / reception antenna 425, a marker radio wave receiving circuit (first signal receiving means) 426, a marker radio wave receiving antenna 427, and a display circuit external connection circuit 428. Further, the mobile wireless communication terminal 420 may include a marker radio wave receiving antenna and a wireless network transmitting / receiving antenna as one shared antenna, as in the mobile wireless communication terminal 120'shown in FIG. 7.

Further, in the mobile wireless communication system 400 described above, the tables shown in FIGS. 11, 12, and 13 are stored in the control circuit of the tag 410, and the tag 410 uses the transmission power control value obtained based on the distance information as a marker radio wave. Send. That is, the marker radio wave in the above embodiment indirectly indicates the distance information. However, the above table may be provided not in the control circuit 411 of the tag 410 but in the control circuit 421 of the mobile wireless communication terminal 420, and the above-mentioned distance information may be directly included in the marker radio wave radiated from the tag 410. In either configuration, the control circuit 421 of the portable wireless communication terminal 420 transmits the transmission power limiting signal applied in preference to the transmission power control signal received from the outdoor or indoor wireless base station to the wireless transmission circuit 422. It can be transmitted and used to limit the maximum transmission power.

With the above configuration, the mobile wireless communication system of the present embodiment can limit the data signal transmission output for the wireless network of the mobile wireless communication terminal when the tag and the mobile wireless communication terminal are close to each other.

&lt;Fifth Example&gt; A schematic diagram of the mobile wireless communication system 500 according to the fifth embodiment of the present invention is shown in FIG.

The mobile wireless communication system 500 has a tag 510 attached to a precision electric device or the like, and a mobile wireless communication mobile terminal 520 such as a mobile phone.

The tag 510 includes a control circuit 511, a marker radio wave transmission circuit (another example of the first signal transmission means) 512 connected to the control circuit 511, a marker radio wave transmission antenna 513, and an ultrasonic oscillation circuit (second signal). Another example of transmission means) 514. The tag 510 of this embodiment radiates ultrasonic waves (another example of the second signal) by the ultrasonic oscillation circuit 514, and further emits a marker radio wave (another example of the first signal) by the marker radio wave transmission circuit 512. Radiate. It is desirable that these circuits are synchronized by the control circuit 511. Here, it is desirable that the marker radio wave is weak so as not to give electromagnetic interference to the precision electric device itself to which the tag 510 is attached.

The portable wireless communication terminal 520 includes a control circuit 521, a wireless transmission circuit (another example of a wireless transmission means) 522, a wireless reception circuit (another example of a wireless reception means) 523, an antenna sharing circuit 524, and wireless. Network transmission / reception antenna 525, marker radio reception circuit (another example of the first signal reception means) 526, marker radio reception antenna 527, display circuit external connection circuit 528, distance calculation circuit 529, and ultrasonic reception circuit. (Another example of the second signal receiving means) It has a 530 and an ultrasonic sensor 531. Further, the mobile wireless communication terminal 520 may include a marker radio wave receiving antenna and a wireless network transmitting / receiving antenna as one shared antenna, as in the mobile wireless communication terminal 120'shown in FIG. 7. The display circuit external connection circuit 528 connects the control circuit 521 to an external display device such as a display.

The mobile wireless communication terminal 520 receives the ultrasonic waves radiated from the tag 510 and the marker radio waves by the ultrasonic sensor 531 and the marker radio wave receiving antenna 527, respectively. Since the propagation speed of space is different between ultrasonic waves and marker radio waves, the distance calculation circuit 529 calculates the distance from the mobile wireless communication terminal 520 to the tag 510 based on the reception time difference, and this distance information is sent to the control circuit 521. introduce. The control circuit 521 has a table showing the correlation between the distance information and the transmission power control value of the mobile wireless communication terminal 520 as shown in FIG. 11, FIG. 12, or FIG. 13, and the transmission power obtained based on this table. The control value is used in preference to the transmission power control signal received from the outdoor or indoor radio base station to limit the maximum transmission power of the portable wireless communication terminal 520.

With the above configuration, the mobile wireless communication system of the present embodiment can limit the data signal transmission output for the wireless network of the mobile wireless communication terminal when the tag and the mobile wireless communication terminal come close to each other.

&lt;Sixth Example&gt; A schematic diagram of the mobile wireless communication system 600 according to the sixth embodiment of the present invention is shown in FIG. The sixth embodiment can be considered to be a further extension of the configuration of the fifth embodiment.

The mobile wireless communication system 600 has a tag 610 attached to a precision electric device or the like, and a mobile wireless communication mobile terminal 620 such as a mobile phone.

The difference between the mobile wireless communication system 600 of this embodiment and the communication system 500 of the fifth embodiment of FIG. 14 is that the control circuit of the tag 610 provides device information which is information about a precision electric device to which the tag 610 is attached. It has a device information storage memory 615 to store, and the marker radio wave transmission circuit (another example of the first signal transmission circuit) 612 transmits a marker radio wave (another example of the first signal) including device information. is there. As an example of device information, there is categorization according to the radio wave immunity level of electrical devices.

On the other hand, the mobile wireless communication terminal 620 is different from the mobile wireless communication terminal 520 of the fifth embodiment in that the device information detection circuit 632 is provided in parallel with the distance calculation circuit 629. Similar to the fifth embodiment, the mobile wireless communication terminal 620 uses the ultrasonic wave (an example of the second signal) radiated from the tag 610 and the marker radio wave (an example of the first signal) to perform the portable wireless communication in the distance calculation circuit 629. The distance from the communication terminal 620 to the tag 610 is calculated, and this distance information is transmitted to the control circuit 621. On the other hand, the device information detection circuit (an example of the device information detection means) 632 detects the device information from the marker radio wave radiated from the tag 610 and transmits the device information to the control circuit 621. The control circuit 621 has a table showing the correlation between the distance information between the portable wireless communication terminal 620 and the precision device and the transmission power control value, and a radio wave immunity level table of the precision electrical device indicated by the device information. .. As a result, the control circuit 621 calculates a transmission power control value according to the distance between the portable wireless communication terminal 620 and the precision electric device, which is less than the immunity level of the precision electric machine. , Transmit to the wireless transmission circuit 622. This transmission power control value is prioritized over the transmission power control signal received from the outdoor or indoor radio base station, and is used to limit the maximum transmission power of the portable wireless communication terminal 620. The display circuit external connection circuit 628 connects the control circuit 621 to an external display device such as a display.

With the above configuration, the present invention further considers the radio wave immunity level allowed for the precision electric device to which the tag is attached, and also considers the data signal for the wireless network of the portable wireless communication terminal when the tag and the portable wireless communication terminal come close to each other. The transmission output can be limited.

&lt;7th Example&gt; A schematic diagram of the mobile wireless communication system 700 according to the 7th embodiment of the present invention is shown in FIG.

The mobile wireless communication system 700 has a tag 710 attached to a precision electric device or the like, and a mobile wireless communication mobile terminal 720 such as a mobile phone.

The tag 710 includes a control circuit 711, a light emitting circuit (another example of the second signal transmitting means) 712 and an ultrasonic oscillation circuit (another example of the first signal transmitting means) 713 connected to the control circuit 711. Has. The tag 710 emits ultrasonic waves (another example of the first signal) by the ultrasonic oscillator circuit 713 and an optical signal (another example of the second signal) by the light emitting circuit 712. It is desirable that these signals are synchronized by the control circuit 711.

The portable wireless communication terminal 720 includes a control circuit 721, a wireless transmission circuit (an example of a wireless transmission means) 722, a wireless reception circuit (an example of a wireless reception means) 723, an antenna sharing circuit 724, and a wireless network transmission / reception antenna 725. Optical receiving circuit (another example of the second signal receiving means) 726, light receiving element 727, display circuit external connection circuit 728, distance calculation circuit 729, and ultrasonic receiving circuit (another of the first signal receiving means). One example) It has a 730 and an ultrasonic sensor 731. The display circuit external connection circuit 728 connects the control circuit 721 to an external display device such as a display.

The mobile wireless communication terminal 720 receives the ultrasonic waves and light radiated from the tag 710 by the ultrasonic sensor 731 and the light receiving element 727, respectively. Since the transmission speed of space is different between ultrasonic waves and light, the distance calculation circuit 729 calculates the distance from the mobile wireless communication terminal 720 to the tag 710 based on the reception time difference, and transmits this distance information to the control circuit 721. .. The control circuit 721 has a table showing the correlation between the distance information and the transmission power control value of the portable wireless communication terminal 720. The distance information generally has a positive correlation with the transmission power control value. For example, as the distance increases as shown in FIG. 11, the power limit value increases linearly or stepwise as shown in FIG. ing. Alternatively, as shown in FIG. 13, the transmission power limit value may be constant regardless of the distance. The control circuit 721 sends the transmission power control value obtained based on this table to the radio transmission circuit 722, whereby the radio signal takes precedence over the transmission power control signal received from the outdoor or indoor radio base station. The transmission power control value is applied to the transmission power of.

With the above configuration, the mobile wireless communication system of the present embodiment can limit the data signal transmission output for the wireless network of the mobile wireless communication terminal when the tag and the mobile wireless communication terminal are close to each other without using the marker radio wave. it can.

&lt;Eighth Example&gt; A schematic diagram of the mobile wireless communication system 800 according to the eighth embodiment of the present invention is shown in FIG.

The mobile wireless communication system 800 has a tag 810 attached to a precision electric device or the like, and a mobile wireless communication mobile terminal 820 such as a mobile phone.

The tag 810 of this embodiment is the same as the tag 710 of the seventh embodiment, and is the control circuit 811 and the light emitting circuit 812 (another example of the second signal transmitting means) connected to the control circuit 811 and the ultrasonic wave. It has an oscillating circuit (another example of the first signal transmitting means) 813. The tag 810 emits ultrasonic waves (another example of the first signal) by the ultrasonic oscillator circuit 813 and an optical signal (another example of the second signal) by the light emitting circuit 812. It is desirable that these are synchronized by the control circuit 811.

The portable wireless communication terminal 820 includes a control circuit 821, a wireless transmission circuit (an example of a wireless transmission means) 822, a wireless reception circuit (an example of a wireless reception means) 823, an antenna sharing circuit 824, a wireless network transmission / reception antenna 825, and the like. Optical receiving circuit (another example of the second signal receiving means) 826, light receiving element 827, display circuit external connection circuit 828, distance calculation circuit 829, and ultrasonic receiving circuit (another of the first signal receiving means) One example) It has an 830, an ultrasonic sensor 831 and a metal shield 832. That is, the mobile wireless communication terminal 820 of the eighth embodiment further includes a metal shield 832 that covers the ultrasonic sensor 831 and the light receiving element 827, in addition to the structure of the portable wireless communication terminal 720 of the seventh embodiment. Even if the ultrasonic sensor 831 and the light receiving element 827 are susceptible to electromagnetic interference, if they are covered with a mesh-like metal shield 832 in this way, radio waves cannot pass through this metal shield 832, so electromagnetic interference can be reduced. it can.

With the above configuration, the present invention eliminates the influence of external radio waves without using marker radio waves, and provides data signal transmission output for the wireless network of the mobile wireless communication terminal when the tag and the mobile wireless communication terminal come close to each other. Can be restricted.

As described above, the mobile wireless communication system having the configuration of the present invention can limit the transmission power of the portable wireless communication terminal by installing the tag at a desired place. For example, by attaching a tag to a precision electric device such as a medical electric device in a hospital and causing the tag to detect an approaching mobile wireless communication terminal, the transmission power of the approaching mobile wireless communication terminal can be controlled. Electromagnetic interference can be reduced.

<figref num="1">This is an example of conventional portable wireless communication terminal transmission power control when a wireless link is established with an outdoor base station outdoors.</figref><figref num="2">This is an example of transmission power control of a portable wireless communication terminal when a wireless link is established with an outdoor base station indoors.</figref><figref num="3">It is a block diagram which shows the mobile wireless communication system which concerns on 1st Embodiment of this invention.</figref><figref num="4">This is an example of a table of transmission power control values of a portable wireless communication terminal according to a marker radio wave reception level according to the present invention.</figref><figref num="5">This is another example of the table of the transmission power control value of the portable wireless communication terminal according to the marker radio wave reception level according to the present invention.</figref><figref num="6">It is still another example of the table of the transmission power control value of the portable wireless communication terminal by the marker radio wave reception level which concerns on this invention.</figref><figref num="7">It is a block diagram which shows the modification of the portable wireless communication terminal of the mobile wireless communication system which concerns on 1st Embodiment of this invention.</figref><figref num="8">It is a block diagram which shows the mobile wireless communication system which concerns on 2nd Embodiment of this invention.</figref><figref num="9">It is a block diagram which shows the mobile wireless communication system which concerns on 3rd Embodiment of this invention.</figref><figref num="10">It is a block diagram which shows the mobile wireless communication system which concerns on 4th Embodiment of this invention.</figref><figref num="11">This is an example of a table of transmission power control values of a mobile wireless communication terminal based on distance information according to the present invention.</figref><figref num="12">This is another example of the table of transmission power control values of a mobile wireless communication terminal based on distance information according to the present invention.</figref><figref num="13">It is still another example of the table of the transmission power control value of the portable wireless communication terminal by the distance information which concerns on this invention.</figref><figref num="14">It is a block diagram which shows the mobile wireless communication system which concerns on 5th Embodiment of this invention.</figref><figref num="15">It is a block diagram which shows the mobile wireless communication system which concerns on 6th Embodiment of this invention.</figref><figref num="16">It is a block diagram which shows the mobile wireless communication system which concerns on 7th Embodiment of this invention.</figref><figref num="17">It is a block diagram which shows the mobile wireless communication system which concerns on 8th Embodiment of this invention.</figref>

Code description

100, 200, 300, 400, 500, 600, 700, 800 Mobile radio communication system 110, 210, 310, 410, 510, 610, 710, 810 Tags 120, 220, 320, 420, 520, 620, 720, 820 Mobile wireless communication terminal 111, 211, 311, 411, 511, 611, 711, 811, 121, 221, 321, 421, 521, 621, 721, 821 Control circuit 112, 312, 412, 512, 612 Marker radio wave transmission circuit 113, 313, 413, 513, 613 Marker radio wave transmitting antenna 126, 326, 426, 526, 626 Marker radio wave receiving circuit 127, 327, 427, 527, 627 Marker radio wave receiving antenna 212, 314, 414, 514, 614, 713 , 813 Radio wave oscillator circuit 226, 315, 415, 530, 630, 730, 830 Radio wave reception circuit 227, 316, 416, 531, 631,731, 831 Radio wave sensor 712, 812 Light emission circuit 726, 826 Optical reception circuit 727, 827 Light receiving element 417, 529, 629, 729, 829 Distance calculation circuit 632 Device information detection circuit 832 Ultrasonic shield 122, 222, 322, 422, 522, 622, 722, 822 Wireless transmission circuit 123, 223, 323, 423, 523 , 623, 723, 823 Wireless reception circuit 124, 124', 224, 324, 424, 524, 624, 724, 824 Antenna shared circuit 125, 225, 325, 425, 525, 625, 725, 825 Wireless network transmission / reception antenna 128 , 228, 328, 428, 528, 628, 728, 828 Display circuit External connection circuit