JP5034127B2 - Mobile phone use restriction system - Google Patents

Description

  The present invention relates to a system for controlling a use state of a mobile phone, and more particularly, to a system for suppressing inappropriate use in a manner area.

  At present, mobile phones are widely used, and opportunities to be used in various places both indoors and outdoors are increasing. On the other hand, in general society, there are places (manner areas) that are not suitable for use of mobile phones, such as medical institutions and public transportation, and in those places, the use of mobile phones is refrained and voices are not used. Use in silent mode is not required.

  However, there are some users who do not refrain from using mobile phones in the manner area or continue to use without switching to the manner mode, and it is difficult to say that the manners are observed. In the manner area where the administrator is resident, it is possible to respond such as urging to turn off the mobile phone or urging the use of the manner mode, but for power off and switching to the manner mode, Since the operation of the mobile phone becomes indispensable, after all, it is necessary to rely on the user's own morals.

  Thus, for example, Patent Document 1 proposes a system that uses a GPS (Global Positioning System) function mounted on a mobile phone to specify the position of the mobile phone and control switching to the manner mode. This control system adds the location information to the uplink data from the mobile phone to the base station, thereby notifying the main server connected to the base station of the location of the mobile phone, and then the mobile phone is silent on the main server. It is configured to determine whether or not the mobile phone is located in an area and to return a signal for controlling whether or not to switch to the manner mode to the mobile phone.

  Patent Document 2 proposes a system that controls the on / off of a mobile phone by transmitting a GSP pseudo signal from a transmission antenna installed in a manner area and receiving it by a mobile phone with a GPS function. Has been. In this control system, a GPS pseudo signal is generated using a C / A code of a virtual GPS satellite (separate from the C / A code used), and an identification signal indicating that this is a manner area I am trying to use it.

JP 2006-253938 A JP 2007-243672 A

  However, in the control system described in Patent Document 1, since the position is specified using the GPS function of the mobile phone, the mobile phone continues to perform the positioning operation of the current position in order to determine the manner area without omission. There is a need. Since the positioning operation of the current position requires a positioning calculation by the CPU, there is a problem that power consumption is increased.

  The manner area discrimination method in the above control system uses the positioning result of the mobile phone, so the mobile phone is located in a place where it is difficult to receive radio waves from GPS satellites (indoors or places where there are many shields). In this case, there is a possibility that erroneous determination due to positioning error may occur, and there is a problem of lack of stability.

  On the other hand, in the control system described in Patent Document 2, the manner area is identified without using the positioning result of the mobile phone, but the existing C / A code (C / A code corresponding to 32 GPS satellites) is used. Since a GPS pseudo signal is generated using a new C / A code different from the above (a C / A code assuming a GPS satellite after the 33rd unit), the scale of the circuit that generates the C / A code increases. There is.

  Therefore, the present invention has been made in view of the problems in the conventional technology described above, and can use existing identification information related to GPS satellites, and can stably identify manner areas while suppressing an increase in power consumption. It is an object of the present invention to provide a use restriction system for a mobile phone capable of performing the above.

  In order to achieve the above object, the present invention is a use restriction system for controlling a use state of a cellular phone in a manner area, an identification signal generator for generating a manner area signal, and a manner signal that is installed in the manner area. A transmission antenna that transmits a manner area signal generated by the signal generation device, the identification signal generation device includes a diffusion unit that performs diffusion processing using identification information of a GPS satellite in which a transmission radio wave does not reach the manner area; A modulation unit that modulates a signal after spreading processing into a GPS format and outputs the modulated signal as a manner area signal, and the mobile phone includes a reception antenna that receives a signal in the GPS format, and a GPS in which transmission radio waves do not reach the manner area A despreading unit that performs despreading processing on a signal received by the receiving antenna using satellite identification information, and whether or not the despreading processing is possible in the despreading unit. Characterized in that it comprises a use limitation control unit implementing the restrictions on the use of the portable telephone Te.

  According to the present invention, since the manner area is identified using the availability of despreading processing, the positioning operation of the mobile phone becomes unnecessary, and it is not affected by the reception status of radio waves from GPS satellites. . In addition, because the manner information signal is generated using the identification information of the GPS satellite in which the transmission radio wave does not reach the manner area, the existing identification information about the GPS satellite is used to control the use state of the mobile phone in the manner area. Can do.

  In the mobile phone use restriction system, a GPS satellite whose transmission radio wave does not reach the manner area can be an unused GPS satellite and / or a GPS satellite whose elevation angle is 0 ° or less with reference to the manner area.

  In the above mobile phone use restriction system, the transmitting antenna can be a directional radiation antenna, thereby allowing a manner area signal to be transmitted locally and identifying the manner area with high accuracy. become.

  In the above mobile phone use restriction system, the manner in which the identification signal generator is based on a first receiving antenna for receiving a GPS signal and operation data from a GPS satellite received by the first receiving antenna. A first detection unit that detects a GPS satellite that does not reach the area, and the mobile phone does not reach the manner area based on operation data from the GPS satellite that is received by the receiving antenna. And a second detector that detects a GPS satellite.

  In the mobile phone use restriction system, identification information of a GPS satellite in which a transmission radio wave does not reach the manner area can be used as a C / A code.

  In the use restriction system for a mobile phone, the use restriction can be set to turn off the mobile phone, turn off sound, or turn off the wireless unit of the mobile phone.

  As described above, according to the present invention, it is possible to use existing identification information related to GPS satellites and perform stable manner area identification while suppressing an increase in power consumption.

It is a block diagram which shows one Embodiment of the use restriction system of the mobile telephone concerning this invention. It is a figure which shows the structure of the identification signal production | generation part of FIG. It is a figure which shows an example of the code table of FIG. It is a figure which shows the structure of the mobile telephone of FIG. It is a flowchart which shows operation | movement of an identification signal generator. It is a flowchart which shows operation | movement of a mobile telephone.

  Next, modes for carrying out the invention will be described in detail with reference to the drawings.

  FIG. 1 shows an embodiment of a use restriction system for a mobile phone according to the present invention. The use restriction system 1 is roughly divided into an identification signal generator 2, a directional radiation antenna 3, a mobile phone 4 and the like. Consists of

  The identification signal generator 2 is for generating the manner area signal MS, and is installed at a place where the transmission radio waves from the GPS satellites 5-1 to 5-n can be appropriately received. The identification signal generator 2 includes a GPS receiving antenna 21, a GPS receiving unit 22, a GPS data storage unit 23, a spreading code control unit 24, and an identification signal generation unit 25.

  The GPS receiving antenna 21 is for receiving transmission radio waves (GPS signals) from GPS satellites 5-1 to 5-n (n is 32 at the maximum), and is an antenna that resonates at the center frequency of the GPS signal 1575.42 MHz. It is. The GPS receiving unit 22 is a circuit that performs predetermined signal processing such as reception, demodulation, despreading (decoding processing for spread spectrum) on the GPS signal received by the GPS receiving antenna 21.

  The GPS data storage unit 23 is a memory that stores operation data acquired through signal processing in the GPS receiving unit 22. Here, the operation data indicates the operation status of the GPS satellites 5-1 to 5-n, and is periodically transmitted from each of the GPS satellites 5-1 to 5-n. The operation data includes ephemeris data (Ephemeris Data) indicating the detailed orbit and time information of the own satellite, health data (Health Data) indicating whether the state of the satellite device is normal, GPS satellites 5-1 to Almanac data indicating all the approximate trajectories of 5-n is included.

  Based on the operation data stored in the GPS data storage unit 23, the spreading code control unit 24 and GPS satellites that are not used at that time and GPS satellites whose elevation angle is 0 ° or less (satellites located below the horizontal line) ) Is detected. Further, the spreading code control unit 24 arbitrarily selects one of the detected GPS satellites and outputs the satellite number SN.

  The identification signal generation unit 25 generates a manner area signal MS using the satellite number SN selected by the spreading code control unit 24, modulates it into a GPS format, and outputs it. As shown in FIG. 2, the identification signal generator 25 includes a spreading code generator 25a, a dummy data generator 25b, a spreader 25c, and a modulator / amplifier 25d.

  The spreading code generation unit 25a refers to a code table (see FIG. 3) showing the correspondence between the GPS satellite number and the C / A code, and the C / C corresponding to the satellite number SN selected by the spreading code control unit 24. A code (spreading code) is output. The dummy data generation unit 25b generates dummy data DD used for generation of the manner area signal MS. The dummy data DD includes, for example, data in which “1” and “0” are alternately repeated, pseudorandom numbers, and the like. Random data generated in is used.

  The spreading unit 25c spreads the dummy data DD generated by the dummy data generating unit 25b with the C / A code output from the spreading code generating unit 25a to generate spread data SD. The modulation / amplification unit 25d modulates the spread data SD generated by the spread unit 25c into a GPS carrier wave 1575.42 MHz, amplifies it, and outputs it as a manner area signal MS.

  Returning to FIG. 1, the directional radiation antenna 3 is a transmission antenna installed in the manner area. The directional radiating antenna 3 is connected to the identification signal generator 2 and is provided to radiate a manner area signal MS output from the identification signal generator 2 in a manner area.

  The mobile phone 4 is a mobile communication terminal carried by the user. As shown in FIG. 4, as shown in FIG. 4, a GPS receiving antenna 41, a GPS receiving unit 42, a despreading unit 43, , A GPS data storage unit 44, a despreading code control unit 45, a despreading code generation unit 46, a use restriction control unit 47, and an operation mode control unit 48.

  The GPS receiving antenna 41 is for receiving GPS signals from the GPS satellites 5-1 to 5-n, similar to the GPS receiving antenna 21 of the identification signal generating device 2, and resonates with the center frequency of the GPS signal 1575.42 MHz. Antenna. When the mobile phone 4 enters the manner area, the mobile phone 4 functions as an antenna that receives transmission radio waves from the directional radiation antenna 3. The GPS receiving unit 42 is a circuit that performs reception / demodulation of a signal received by the GPS receiving antenna 41.

  The despreading unit 43 performs spectrum despreading (decoding processing) using the signal processed by the GPS receiving unit 42 and the C / A code generated by the despreading code generation unit 46, and also performs despreading processing. Is notified to the despreading code control unit 45 and the use restriction control unit 47.

  The GPS data storage unit 44 is a memory that stores operation data acquired through signal processing in the GPS receiving unit 42 and the despreading unit 43. The operation data here is not acquired by receiving the operation data from the identification signal generator 2, but the mobile phone 4 receives the GPS signals from the GPS satellites 5-1 to 5-n. To do.

  Based on the operation data stored in the GPS data storage unit 44, the despreading code control unit 45 detects GPS satellites that are not used at that time and GPS satellites whose elevation angle is 0 ° or less. The despreading code control unit 45 arbitrarily selects one satellite from the detected GPS satellites, and outputs the satellite number SN as a despreading candidate. If the despreading unit 43 cannot despread, the satellite number SN of another satellite is output as the next candidate.

  The despreading code generation unit 46 refers to the code table (see FIG. 3) showing the association between the GPS satellite number and the C / A code, and corresponds to the satellite number SN selected by the despreading code control unit 45. Output C / A code.

  The use restriction control unit 47 determines that the cellular phone 4 has received the manner area signal MS from the directional radiation antenna 3 when receiving a notification from the despreading unit 43 that the despreading process is possible. The mobile phone 4 is subjected to use restriction processing. Examples of the use restriction process include turning off the mobile phone 4, turning off sound, and turning off a wireless unit (not shown).

  The operation mode control unit 48 is a control circuit for switching the operation mode of the mobile phone 4 relating to manner area identification depending on whether or not operation data from the GPS satellites 5-1 to 5-n is received. . Specifically, control is performed so that the manner area identification operation is performed only during a period in which operation data is not received.

  Next, the operation of the use restriction system 1 having the above configuration will be described. Here, first, the operation of the entire use restriction system 1 will be schematically described with reference to FIG.

  When the manner signal MS is generated by the identification signal generator 2, it is radiated to the manner area through the directional radiation antenna 3. In this state, when the cellular phone 4 with the power turned on enters the manner area, the manner area signal MS is received.

  In response to receiving the manner area signal MS, the mobile phone 4 shifts to a use restriction state and automatically turns off the power, for example. Even when the power is turned on after entering the manner area with the mobile phone 4 turned off, the power is automatically turned off as described above. If the user voluntarily turns off the mobile phone 4 before turning off the power automatically, the power-off state is maintained as it is.

  Thereafter, when the user goes out of the manner area, the cellular phone 4 does not receive the manner area signal MS, so the cellular phone 4 releases the use restriction state and automatically turns on the power.

  Next, the operation of the identification signal generator 2 will be described with reference to FIG.

  When the identification signal generator 2 receives GPS signals from the GPS satellites 5-1 to 5-n (step S1), the operation data is extracted from the GPS signals and stored in the GPS data storage unit 23 (step S2).

  Next, the spreading code control unit 24 detects a GPS satellite that is not used at that time based on the operation data stored in the GPS data storage unit 23 (step S3). Unused GPS satellites are detected by searching for a malfunctioning satellite by referring to ephemeris data (information indicating the orbit of each satellite) and health data (information indicating the status of the satellite device) included in the operation data. If there is a malfunctioning satellite, the satellite is detected as an unused satellite.

  As a result, when there is an unused satellite (step S3: Y), the satellite number is set as a candidate for a satellite number used for generating the manner area signal MS (step S4). On the other hand, if there is no unused satellite (step S3: N), the process proceeds to the next process without making the satellite number a candidate.

  Next, a GPS satellite having an elevation angle of 0 ° or less is detected based on the operation data, and the detected GPS satellite number is set as a candidate satellite number used for generating the manner area signal MS (step S5). Detection of GPS satellites having an elevation angle of 0 ° or less is performed by calculating the elevation angle of each GPS satellite using almanac data (information indicating the orbits of all GPS satellites) included in the operation data. Specifically, for each of the GPS satellites 5-1 to 5-n, the elevation angle of the GPS satellite as viewed from the manner area is calculated, and the satellite whose elevation angle is 0 ° or less is determined.

  Next, one satellite number SN is arbitrarily selected from the plurality of candidate satellite numbers SN (step S6), and the C / A code corresponding to the selected satellite number SN in the spreading code generation unit 25a. Is generated.

  Next, in the spreading unit 25c, spreading processing is performed using the C / A code from the spreading code generating unit 25a and the dummy data DD from the dummy data generating unit 25b (step S7), and then modulation / amplification is performed. The unit 25d modulates the spread data SD into a GPS format signal and outputs it as a manner area signal MS to the directional radiation antenna 3 (step S8).

  Thereafter, the processes in steps S1 to S8 are periodically repeated to update the operation data and the satellite number candidates in the GPS data storage unit 23 (step S9). In addition, since the almanac data of the operation data is normally updated at a frequency of about twice a week, it is sufficient to update the operation data and the satellite number candidates in the GPS data storage unit 23 on a daily basis. . However, since the ephemeris data is transmitted in a shorter cycle than the almanac data, it may be updated at intervals shorter than once a day.

  Next, the operation of the mobile phone 4 will be described with reference to FIG.

  First, the reception state of the operation data of the GPS satellites 5-1 to 5-n is confirmed with reference to the reception signal of the GPS reception antenna 41 (step S21). For example, when the operation data is received from the GPS satellites 5-1 to 5-n, or when the current position is measured by the navigation software (not shown) of the mobile phone 4, the operation data is being received. It corresponds to.

  If the operation data is being received (step S21: Y), the operation data is extracted from the GPS signal and stored in the GPS data storage unit 44 as in the case of the identification signal generator 2 (step S21). S22).

  Next, the despreading code control unit 45 detects GPS satellites that are not used at that time and GPS satellites whose elevation angle is 0 ° or less based on the operation data stored in the GPS data storage unit 44 (step S23). To S25). The GPS satellite detection method is the same as that of the identification signal generator 2.

  Also in the mobile phone 4, for example, the processing of steps S22 to S25 is repeated on a daily basis, and operation data and satellite number candidates stored in the GPS data storage unit 44 are periodically updated (step S26).

  On the other hand, when the operation data is not being received (step S21: N), the GPS reception antenna 41 receives a GPS-type transmission radio wave that reaches the mobile phone 4 (step S27), and also performs despreading code control. In the unit 45, one satellite number SN is selected from the candidates acquired in steps S23 to S25 (step S28).

  Next, the despreading unit 43 attempts to despread the signal received by the GPS receiving antenna 41 with the C / A code corresponding to the satellite number SN selected by the despreading code control unit 45, and the despreading is performed. It is determined whether or not it was possible (step S29). Here, whether or not the despreading process is possible is determined based on whether or not the original dummy data DD is restored as a result of the despreading process, and when the dummy data DD can be restored, the identification signal It is recognized that the C / A code used in the generator 2 and the C / A code stored in the mobile phone 4 are correlated.

  As a result of the determination, if the despreading process is possible (step S29: Y), this is notified to the use restriction control unit 47 (step S30). Next, the use restriction control unit 47 determines that the manner area signal MS is received (the mobile phone 4 is located in the manner area region) in response to the notification from the despreading unit 43, Use restrictions such as switching to the manner mode are implemented (step S31).

  On the other hand, when the despreading process is impossible (step S29: N), the despreading code control unit 45 selects another satellite number SN from the candidates acquired in steps S23 to S25. (Step S32: N, Step S28), it is determined again whether or not the despreading process is possible (Step S29). As a result, if the despreading process is possible, use restriction is performed (steps S30 and S31), and if it is not possible, a new satellite number SN is selected (step S28).

  If despreading cannot be performed even if all of the candidates acquired in steps S23 to S25 are used up (step S32: Y), the manner area signal MS is not received (the mobile phone 4 is outside the manner area). If it is not shifted to the use restriction state or is being transferred to the use restriction state, the use restriction is released (step S33).

  As described above, in the present embodiment, the manner area signal MS is generated and transmitted from the directional radiation antenna 3 by the diffusion processing using the C / A code of the GPS satellite in which the transmission radio wave does not reach the manner area. The mobile phone 4 performs a despreading process on the received signal of the GPS receiving antenna 41 using a C / A code of a GPS satellite in which a transmission radio wave does not reach the manner area. Thereby, when the transmission radio wave from the directional radiation antenna 3 is not received, the despreading process of the mobile phone 4 becomes impossible, and only when the transmission radio wave from the directional radiation antenna 3 is received, the reverse is performed. The diffusion process can be completed.

  In addition, since the mobile phone 4 is configured to be restricted in use only when the mobile phone 4 can perform the despreading process, the mobile phone 4 automatically enters the manner area. Thus, the mobile phone 4 can be shifted to the use restricted state. Therefore, the usage state in the manner area can be controlled without using the positioning operation of the current position of the mobile phone, and an increase in power consumption can be avoided.

  In addition, according to the present embodiment, since the manner area signal is generated using the C / A code of the unused GPS satellite and the GPS satellite having an elevation angle of 0 ° or less, it is dedicated only for the purpose of identifying the manner area. There is no need to generate a code, and an existing C / A code can be used as it is. For this reason, it is not necessary to expand the C / A code generation circuit, and it is sufficient to add only a logic (a despreading code control unit) for monitoring the use status of the GPS satellite.

  Furthermore, according to the present embodiment, since the manner area signal MS is transmitted from the directional radiation antenna 3 installed in the manner area, it is affected by the reception status of the radio waves from the GPS satellites 5-1 to 5-n. It is possible to identify the manner area. At this time, since the directional radiation antenna 3 is used as a transmission antenna and the manner area signal MS is locally transmitted, the manner area can be identified with high accuracy.

  In the above embodiment, both unused GPS satellites and GPS satellites whose elevation angle is 0 ° or less are detected as GPS satellites whose transmission radio waves do not reach the manner area, but only one of them is detected. May be.

  In the above embodiment, when the mobile phone 4 enters the manner area, the mobile phone 4 is configured to always shift to the use restriction state. It may be possible to select in advance whether or not to shift to the state.

DESCRIPTION OF SYMBOLS 1 Cell phone use restriction system 2 Identification signal generator 3 Directional radiation antenna 4 Cell phone 5 (5-1 to 5-n) GPS satellite 21 GPS receiving antenna 22 GPS receiving unit 23 GPS data storage unit 24 Spreading code control Unit 25 identification signal generating unit 25a spreading code generating unit 25b dummy data generating unit 25c spreading unit 25d modulating / amplifying unit 25e code table 41 GPS receiving antenna 42 GPS receiving unit 43 despreading unit 44 GPS data storage unit 45 despreading code Control unit 46 Despreading code generation unit 47 Usage restriction control unit 48 Operation mode control unit

Claims (6)

A use restriction system for controlling the use state of a mobile phone in a manner area,
An identification signal generator for generating a manner area signal;
A transmission antenna installed in a manner area and transmitting a manner area signal generated by the identification signal generator;
The identification signal generator modulates a spreading unit that performs spreading processing using identification information of a GPS satellite whose transmission radio wave does not reach the manner area, and modulates the signal after spreading processing into a GPS format and outputs the signal as the manner area signal A modulation unit,
The mobile phone uses a receiving antenna that receives a GPS format signal, and a despreading unit that performs a despreading process on the signal received by the receiving antenna using identification information of a GPS satellite that does not reach the manner area. A use restriction system for a mobile phone, comprising: a use restriction control unit for restricting use of the mobile phone in accordance with whether or not the despreading process is possible in the despreading part.   2. The mobile phone according to claim 1, wherein the GPS satellite in which the transmission radio wave does not reach the manner area is an unused GPS satellite and / or a GPS satellite having an elevation angle of 0 ° or less with respect to the manner area. Use restriction system.   3. The use restriction system for a mobile phone according to claim 1, wherein the transmitting antenna is a directional radiation antenna. The identification signal generator includes a first receiving antenna that receives a signal in GPS format, and a GPS satellite in which a transmission radio wave does not reach the manner area based on operation data from the GPS satellite that is received by the first receiving antenna. A first detection unit for detecting
2. The mobile phone includes a second detection unit that detects a GPS satellite in which a transmission radio wave does not reach the manner area based on operation data from a GPS satellite received by the receiving antenna. The use restriction system for a mobile phone according to 2 or 3.   5. The system for restricting use of a mobile phone according to claim 1, wherein identification information of a GPS satellite in which a transmission radio wave does not reach the manner area is a C / A code.   6. The mobile phone use restriction system according to claim 1, wherein the use restriction is power-off of the mobile phone, sounding off, or power-off of a radio unit of the mobile phone. .

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