JP4019074B2 - Incoming and outgoing call control apparatus and method - Google Patents

Description

  The present invention relates to an incoming / outgoing call restriction apparatus and method, and more particularly to an incoming / outgoing call restriction apparatus and method for restricting outgoing and incoming calls of a mobile terminal that performs communication in a plurality of bands.

  Mobile phones have become widespread, and users can make calls at any location. However, on the other hand, due to manners and the like, there are many cases where it is desired to restrict the use of a mobile phone in a specific space such as a conference room or a concert hall. Conventionally, as a technique for restricting the use of a mobile phone, there is a technique for transmitting a jamming radio wave to the mobile phone to make the mobile phone out of service area. However, since the mobile phone performs a system search when it is out of service area, there is a problem in that extra power is consumed and battery consumption is accelerated.

  There is a technique described in Patent Document 1 as a technique for restricting a call while keeping a mobile phone within range. In this technology, the strength of the radio wave received from the radio base station outdoors toward the predetermined space where the radio wave from the radio base station is attenuated as compared to the outdoors and is surrounded by walls etc. Install an incoming / outgoing call restriction device that transmits radio waves of the same strength as Thereby, in the predetermined space, the mobile phone enters a standby state by the radio wave transmitted by the incoming / outgoing call restriction device.

Since the mobile phone in the predetermined space is in a standby state with a radio wave stronger than the radio wave actually received from the radio base station, it is lower than the signal level that should be transmitted to the radio base station toward the radio base station. Send signal at signal level. For this reason, the radio base station cannot correctly receive a signal from the mobile phone. Therefore, in a predetermined space, it is impossible to make and receive calls, and calls using mobile phones are restricted.
JP 2001-119756 A (FIG. 4, paragraphs 0034 to 0046)

  By the way, at present, services are performed using frequencies in the 2 GHz band in the WCDMA system, but in the near future, frequency shortages are expected. For this reason, it is expected that services will be performed in two frequency bands of 2 GHz and 800 MHz, in which the 800 MHz band is added to the 2 GHz band in the future. However, in such a dual band using two frequency bands, there has been no known technique for regulating a call without taking a mobile device out of service area.

  The present invention relates to an incoming / outgoing call restriction device and method capable of restricting outgoing and incoming calls of a mobile device in a predetermined space while suppressing battery consumption in a mobile communication system in which services are performed using a plurality of bands. The purpose is to provide.

  In order to achieve the above object, an incoming / outgoing call restriction device of the present invention is an incoming / outgoing call restriction device that restricts incoming / outgoing calls in a predetermined space by a mobile device that is waiting on any of a plurality of band signals, A first antenna arranged outside a predetermined space and receiving a plurality of band signals transmitted from a radio base station, and a plurality of band signals received by the first antenna are respectively A frequency converter that converts the signal into a signal in a band different from the band, and a second antenna that is arranged in a predetermined space and transmits signals in a plurality of bands whose bands are converted by the frequency converter In the predetermined space, when the signal transmitted from the second antenna is received by the mobile device, the signal power transmitted from the radio base station is received by the mobile device. Greater than the signal power of So as to, wherein said second antenna and a level adjuster for adjusting a signal level of a plurality of bands of signals to be transmitted.

  An incoming / outgoing call restriction method according to the present invention is an incoming / outgoing call restriction method for restricting incoming / outgoing calls in a predetermined space by a mobile device that stands by using one of a plurality of bands of signals, and a plurality of incoming / outgoing calls transmitted from a radio base station Of a plurality of bands is received by a first antenna installed outside a predetermined space, and each of the received signals of the plurality of bands is one of the plurality of bands and has a band different from the band. The signal is converted into a signal, the converted signal is transmitted from the second antenna, and the signal level transmitted from the second antenna is received by the mobile device within the predetermined space. The signal power at the time of transmission is set to be larger than the signal power at the time when the signal transmitted from the radio base station is received by the mobile device.

  In the incoming / outgoing call control apparatus and method of the present invention, the signal power when the signal transmitted from the second antenna is received by the mobile station is received by the mobile station within the predetermined space. Since it is larger than the signal power at the time of being transmitted, the mobile device in the predetermined space enters a standby state by the signal whose band is switched transmitted from the second antenna. For this reason, in the predetermined space, the mobile device receives a signal transmitted from the base station in a predetermined band in a band different from the band, and outgoing and incoming calls are restricted.

  In the incoming / outgoing call restriction device of the present invention, the frequency converter includes a first duplexer for separating the signals of the plurality of bands received by the antenna for each band, and the signals of the separated plurality of bands for the band. It is possible to employ a configuration including a signal conversion unit that converts a signal in a band different from the above and a second duplexer that synthesizes the signal in the band converted by the signal conversion unit.

  In the incoming / outgoing call control apparatus according to the present invention, the level adjustment unit substantially includes a reception power of a signal from a radio base station received by the first antenna and a transmission power of a signal transmitted by the second antenna. The transmission power of the signal transmitted by the second antenna can be controlled so as to be at the same level. For example, in a room of a building, the received power when a mobile device receives a signal transmitted from a wireless base station within a predetermined space is the same as that when the mobile device receives a signal transmitted from the wireless base station outside the building. It is weaker than the received power. In this case, when the first antenna is installed outdoors and the second antenna is installed indoors, the level adjustment unit sets the total gain from the first antenna to the second antenna to 0 dB. Thus, the incoming / outgoing call of the mobile device can be regulated by setting the mobile device in the room in a standby state by the signal transmitted from the second antenna whose band is switched.

  In the incoming / outgoing call restriction device and method of the present invention, in a predetermined space, the mobile device enters a standby state by a signal with a band exchange transmitted from the second antenna, and the mobile device is placed in the predetermined space. Cannot recognize calls and incoming calls. For this reason, it is possible to suppress the battery consumption of the mobile device as compared to the case where the mobile device is out of service area and outgoing / incoming calls are restricted.

  Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. FIG. 1 shows the configuration of an incoming / outgoing call restriction device. The incoming / outgoing call restriction device 100 includes an antenna 1, a frequency conversion unit 2, a distributor 3, a level adjustment unit 4, and an antenna 5. The incoming / outgoing call restriction device 100 is in a specific area or in a specific space such as indoors in a service area where a WCDMA mobile communication system is constructed in two frequency bands of 2 GHz band and 800 MHz band. Restrict incoming and outgoing calls to mobile stations in

  The antenna 1 is installed outdoors, for example, and the antenna 5 is installed in a specific space where incoming / outgoing call regulation is desired. For example, when it is desired to restrict incoming / outgoing calls in a plurality of rooms in a building, the antenna 1 is installed on the roof of the building, and the antenna 5 is installed in each room where regulation is desired. The antenna 1 receives a 2 GHz band signal and an 800 MHz band signal transmitted from a radio base station (not shown).

  The frequency conversion unit 2 inputs a radio signal received by the antenna 1, performs frequency conversion, and switches the band of the input radio signal. Specifically, a signal transmitted in the 2 GHz band is converted into an 800 MHz band signal, and a signal transmitted in the 800 MHz band is converted into a 2 GHz band signal. FIG. 2 shows a specific configuration of the frequency converter 2. The frequency conversion unit 2 includes duplexers 6a and 6b, local signal sources 7a and 7b, mixers 8a and 8b, and amplifiers 11a and 11b.

  The first duplexer 6a separates the signal received in the 2 GHz band and the signal received in the 800 MHz band from the signal received by the antenna 1. The first duplexer 6a inputs a signal received in the 2 GHz band to the first mixer 8a. In addition, a signal received in the 800 MHz band is input to the second mixer 8b. The first mixer 8a uses the local signal input from the first local signal source 7a to convert a signal received in the 2 GHz band into a signal in the 800 MHz band. The second mixer 8b converts a signal received in the 800 MHz band into a signal in the 2 GHz band using the local signal input from the second local signal source 7b.

  The 800 MHz band signal output from the first mixer 8a is amplified by a predetermined gain by the amplifier 11a and input to the second duplexer 6b. The signal in the 2 GHz band output from the second mixer 8b is amplified by a predetermined gain by the amplifier 11b and input to the second duplexer 6b. The second duplexer 6b synthesizes the input 2 GHz band signal and the 800 MHz band signal, and outputs a signal whose band is switched.

  The distributor 3 distributes the signal frequency-converted by the frequency converter 2 into a plurality of signals having the same level. As the distributor 3, for example, a Wilkinson hybrid can be used. The antenna 5 transmits a signal in which a signal transmitted in the 2 GHz band is converted into a signal in the 800 MHz band by frequency conversion by the frequency conversion unit 2 and a signal transmitted in the 800 MHz band is converted into a signal in the 2 GHz band. To do.

  The level adjusting unit 4 attenuates the signal whose band has been changed by the frequency converting unit 2 by a predetermined attenuation amount, outputs the signal to the antenna 5, and adjusts the level of the signal output from the antenna 5. In the space where the antenna 5 is installed, the level adjustment unit 4 receives the power when the radio wave transmitted from the antenna 5 is received by the mobile device, and the radio wave transmitted from the radio base station is received by the mobile device. The level of the signal output from the antenna 5 is adjusted so as to be larger than the power at the time of transmission.

  FIG. 3 shows a specific configuration of the level adjustment unit 4. The level adjustment unit 4 includes a variable resistor 12, an operational amplifier 13, and a voltage control variable attenuator 14. The variable resistor 12 divides and outputs the potential difference between the reference voltage and GND by adjusting the resistance value. The operational amplifier 13 receives the voltage divided by the variable resistor 12 and outputs a control voltage signal corresponding to the input voltage. The voltage control variable attenuator 14 receives the signal distributed by the distributor 3, attenuates the signal by an attenuation amount corresponding to the control voltage signal, and outputs the signal to the antenna 5.

  Here, communication between a radio base station and a mobile device will be described in the case where a WCDMA mobile communication system is constructed in two frequency bands of 2 GHz band and 800 MHz band. In such a system, the mobile device has a configuration that supports both the 2 GHz band and the 800 MHz band.

  After the power is turned on, the mobile device is instructed by a signal from the radio base station whether it is in a standby state in the 2 GHz band or in a standby state in the 800 MHz band. For example, if the number of the mobile device is an even number, the mobile device is instructed to enter a standby state in the 2 GHz band, and if the number is an odd number, the mobile device is instructed to enter a standby state in the 800 MHz band. In this way, by dispersing the frequency band used for standby, the mobile devices are distributed in the standby frequency band without being distributed in either the 2 GHz band or the 800 MHz band.

  FIG. 4 shows a state of incoming / outgoing call restriction using the incoming / outgoing call restriction device 100. In the figure, one of the signal lines distributed by the distributor 3 is shown, and the others are omitted. The antenna 5 is installed in a room 16 where incoming / outgoing calls are to be restricted, and transmits radio waves into the room 16. The antenna 1 is installed on the roof of the building 15 where the radio wave environment is better than that of the room 16.

  Hereinafter, for the sake of explanation, explanation will be made using specific numerical values. The radio base station transmits radio waves with a power of +30 dBm. The attenuation amount of the radio wave due to the atmosphere between the radio base station and the building 15 is 100 dB. The attenuation when passing through the wall of the building 15 is 20 dB. Note that the propagation loss in the room 16 is ignored.

The gain of the frequency converter 2 is, for example, 20 dB. Regarding the loss of the distributor 3, when the Wilkinson hybrid is used, the distribution number n is a power of 2, and the loss (theoretical value) is
Loss = 10 × log (n) (dB)
Given in. For example, when the distribution number n is 4, the loss of the distributor 3 is 6 dB. The attenuation amount of the level adjusting unit 4 is, for example, 14 dB. In this case, the total gain from the antenna 1 to the antenna 5 is (+20 dB-6 dB-14 dB) = 0 dB.

  The antenna 1 receives the radio wave 20 transmitted from the radio base station with a power of +30 dBm−100 dB = −70 dBm. Since the total gain from the antenna 1 to the antenna 5 is 0 dB, the antenna 5 outputs a radio wave 22 of −70 dBm, and the mobile device 10 in the room 16 receives the radio wave 22 at −70 dBm. Assuming that the reception power of the radio wave received from the radio base station at the outer wall of the building 15 is −70 dBm, the mobile device 10 reduces the radio wave 21 from the radio base station to the attenuation (−20 dB) by the wall of the building 15. Is received at a power of (−70 dBm−20 dB) = − 90 dBm.

  As described above, when the power of the signal received directly from the radio base station by the mobile device 10 is compared with the power of the signal received from the antenna 5, the power of the signal received from the antenna 5 is received from the radio base station. It is set sufficiently larger than the power of the signal to be transmitted. For this reason, the mobile device 10 in the room 16 enters a standby state not by the radio wave 21 from the radio base station but by the radio wave 22 transmitted from the antenna 5.

  Now, it is assumed that the mobile device 10 is in a standby state in the 2 GHz band. In this case, when the user makes a call using the mobile device 10, the mobile device 10 transmits a message to that effect to the radio base station in the 2 GHz band. The radio base station receives a signal from the mobile device 10 and returns a response to the signal to the mobile device 10 in the 2 GHz band. The incoming / outgoing call restriction device 100 converts a signal returned from the radio base station in the 2 GHz band into a signal in the 800 MHz band and transmits the signal from the antenna 5.

  The mobile device 10 tries to receive the signal returned from the radio base station in the 2 GHz band. However, the power of the signal received by the mobile device 10 from the antenna 5 is sufficiently larger than the power of the signal received directly from the radio base station. For this reason, the mobile device 10 receives a signal transmitted from the radio base station in the 2 GHz band from the antenna 5 in the 800 MHz band. Therefore, the mobile device 10 cannot recognize a reply from the radio base station corresponding to the call and cannot make a call.

  Further, consider a case where the radio base station transmits a signal for calling the mobile device 10 in the 2 GHz band. In this case, the mobile device 10 receives the calling signal that should be received in the 2 GHz band in the 800 MHz band via the incoming / outgoing call restriction device 100 in the same manner as described above. For this reason, the mobile device 10 cannot recognize the call signal and cannot receive the call as in the case of the outgoing call. Therefore, in the space in the room 16, the mobile device 10 cannot make or receive calls, and the call by the user is restricted.

  On the other hand, the mobile device 9 located near the building 15 and outside the room 16 receives the radio wave 20 transmitted by the radio base station at a power of −70 dBm, like the antenna 1. For this reason, the mobile device 9 is in a standby state by the radio wave 20 transmitted from the radio base station without being affected by the radio wave 22 transmitted from the antenna 5. Therefore, the mobile device 9 is not restricted from making and receiving calls by the incoming and outgoing call restriction device 100.

  In the present embodiment, in the room 16, the mobile device 10 receives the radio wave 20 from the radio base station with lower power than the mobile device 9 located outdoors. The incoming / outgoing call restriction device 100 receives the radio wave 22 in which the signal in the 2 GHz band and the signal in the 800 MHz band are exchanged at the same level as the electric power of the radio wave 20 received by the outdoor mobile station 9 from the radio base station. To do. As a result, the mobile device 10 enters a standby state by the radio wave 22 transmitted from the incoming / outgoing call restriction device 100, and receives a signal in a frequency band originally used for standby in a different frequency band. For this reason, the mobile device 10 cannot recognize the outgoing call and incoming call, and the outgoing call and incoming call are restricted. At this time, since the mobile device 10 is within a range where the call is restricted, it is possible to suppress battery consumption compared to the case where the call is restricted by transmitting jamming radio waves.

  In the above embodiment, an example has been described in which the mobile device performs communication using the 2 GHz band and the 800 MHz band, but other bands can also be used. Further, the mobile communication system is not limited to the one that performs communication by the WCDMA method. The above embodiment can be applied even when the mobile communication system is configured as a system that performs communication using three or more bands. In that case, the frequency conversion unit 2 may convert each of the signals of three or more bands into a band different from the original band.

  Although the present invention has been described based on the preferred embodiment, the incoming / outgoing call restriction device and method of the present invention are not limited to the above embodiment example, and various modifications can be made from the configuration of the above embodiment. Further, modifications and changes are also included in the scope of the present invention.

The block diagram which shows the structure of an incoming / outgoing call control apparatus. FIG. 3 is a block diagram showing a specific configuration of a frequency conversion unit 2. 4 is a block diagram showing a specific configuration of the level adjustment unit 4. The schematic diagram which shows the mode of the incoming / outgoing call control using the incoming / outgoing call control apparatus 100. FIG.

Explanation of symbols

1, 5: Antenna 2: Frequency converter 3: Divider 4: Level adjuster 6: Duplexer
7: Local signal source 8: Mixer
9, 10: Mobile equipment (MS)
11: Amplifier (AMP)
12: variable resistor 13: operational amplifier 14: voltage controlled variable attenuator 15: building 16: room (regulated space)

Claims (4)

An incoming / outgoing call restriction device for restricting incoming / outgoing calls in a predetermined space by a mobile device that stands by with one of a plurality of band signals,
A first antenna that is arranged outside a predetermined space and receives signals of a plurality of bands transmitted from a radio base station;
A frequency conversion unit that converts each of a plurality of band signals received by the first antenna into a signal of any of the plurality of bands and different from the band;
A second antenna that is arranged in a predetermined space and transmits signals of a plurality of bands whose bands are converted by the frequency converter;
Within the predetermined space, the signal power when the signal transmitted from the second antenna is received by the mobile device is the signal power when the signal transmitted from the radio base station is received by the mobile device. An incoming / outgoing call restriction device, comprising: a level adjusting unit that adjusts signal levels of signals in a plurality of bands transmitted by the second antenna so as to be larger than power. The frequency converter is
A first duplexer for separating the signals of the plurality of bands received by the antenna for each band;
A signal converter that converts the separated signals of the plurality of bands into a signal of a band different from the band;
The incoming / outgoing call restriction device according to claim 1, further comprising a second duplexer that synthesizes a signal of a band converted by the signal conversion unit.   The level adjustment unit is configured so that the reception power of the signal from the radio base station received by the first antenna and the transmission power of the signal transmitted by the second antenna have substantially the same level. The incoming / outgoing call restriction device according to claim 1 or 2, which controls transmission power of a signal transmitted by the second antenna. An incoming / outgoing call restriction method for restricting incoming / outgoing calls in a predetermined space by a mobile device that stands by with one of a plurality of band signals,
A plurality of band signals transmitted from the radio base station are received by the first antenna installed outside the predetermined space,
Each of the received signals of the plurality of bands is converted into a signal of any of the plurality of bands and different from the band,
The converted signal is transmitted from the second antenna, and the signal level of the signal to be transmitted is determined in accordance with the signal power when the signal transmitted from the second antenna is received by the mobile device in the predetermined space. Is set such that the signal transmitted from the radio base station is larger than the signal power when the mobile station receives the signal.

Images