JP4429828B2 - Mobile communication device with contactless card - Google Patents

Description

  The present invention relates to a mobile communication device such as a mobile phone, and more particularly to a non-contact card-mounted mobile body equipped with a non-contact card such as an IC card that communicates with an automatic ticket gate and performs fee settlement. The present invention relates to a communication device.

  As described in Patent Documents 1 and 2 below, a non-contact card such as an IC card is mounted on a mobile phone or the like, and the mobile phone is simply held over an automatic ticket checker or the like. It is now possible to make a payment for the boarding fee by making communication between the two.

  Such a mobile phone displays communication on a charge between a contactless card and an automatic ticket gate or balance information and usage history information recorded on the contactless card on a liquid crystal display unit of the mobile phone. Regardless of the operation, as described in Patent Document 3 below, wireless communication is performed with the base station constantly and intermittently, for example, about 20 ms in a 720 ms cycle, and it is checked whether there is a call. ing. The reason why wireless communication is performed intermittently is to avoid the battery running out.

  FIG. 4 is a timing chart when operating a contactless card mounted on a conventional mobile phone. A control signal is always output from the base station, and the mobile phone receives the control signal indicated by “A”, so that the power of the receiving unit is intermittently received by the signal c-rx for about 20 ms in a 720 ms cycle. To check whether there is a call from the base station.

  At this time, for example, when the user performs a predetermined push button operation to read out his / her balance information from the contactless card and display it on the display unit of the mobile phone, the control unit of the mobile phone uses the signal c-card to Supply power. As a result, the crystal oscillator mounted on the contactless card oscillates and supplies an oscillation signal (OSC signal) to the contactless card, and the contactless card becomes operable. The conventional mobile phone controls the operation of the contactless card irrespective of the communication operation with the base station of the mobile phone.

Japanese Patent Laid-Open No. 2004-62265 Japanese Patent Laid-Open No. 2003-36427 Japanese Patent No. 3033613

  However, if an OSC signal is output from the crystal oscillator of the contactless card while the mobile phone is performing wireless communication with the base station, the OSC signal is emitted as radiation noise to the original communication unit of the mobile phone. There is a problem that the reception sensitivity deteriorates and bit errors of received data may increase.

  An object of the present invention is to provide a contactless card-mounted mobile communication device capable of operating a contactless card without hindering the original communication function.

  The contactless card-mounted mobile communication device of the present invention includes a transmission / reception unit that intermittently receives a control signal from a base station, a contactless card that oscillates an oscillator during operation, and the transmission / reception unit receives the control signal. And a control means for operating the contactless card when not in operation.

  With this configuration, the oscillation of the contactless card oscillator is stopped while receiving the control signal from the base station, so that the control signal reception is not hindered.

  The control means of the contactless card-mounted mobile communication device of the present invention prohibits the operation of the contactless card when the transmitting / receiving unit detects that the intermittent receiving operation has shifted to the continuous receiving operation. The contactless card is operated after the continuous reception operation is completed and the intermittent reception is resumed.

  With this configuration, since the oscillation of the contactless card oscillator is stopped during the continuous reception operation, the continuous reception operation is not hindered.

  When the control signal from the base station cannot be received, the control means of the contactless card-mounted mobile communication device of the present invention shifts from the intermittent reception state to the battery saving state and receives the transmission / reception unit. The contactless card is operated while the operation is stopped.

  With this configuration, the contactless card can be operated even when radio waves do not reach and intermittent reception is no longer performed.

  The control means of the contactless card-mounted mobile communication device of the present invention compares the reception level of the control signal with a set level when operating the contactless card, and the reception level is weaker than the set level. Is characterized in that the contactless card is operated when the control signal is not received, and the contactless card is operated regardless of whether the control signal is received or not when the reception level is higher than the set level.

  With this configuration, when the reception level is strong, it is possible to operate the contactless card without waiting time and view necessary information stored in the contactless card.

  ADVANTAGE OF THE INVENTION According to this invention, it becomes possible to control the operation | movement of a non-contact card, without degrading the reception data of a mobile communication apparatus.

Hereinafter, an embodiment of the present invention will be described with reference to the drawings.

  FIG. 1 is a block diagram of a contactless card-mounted mobile communication device according to an embodiment of the present invention. The mobile communication device may be, for example, a digital wireless telephone such as GSM or PDC, an analog wireless telephone, or an information terminal device such as a PDA that receives or transmits wireless communication.

  This mobile communication device 20 is connected to a high-frequency antenna 1 and performs a transmission / reception unit 2 that performs modulation and demodulation necessary for transmission / reception, a digital processing unit 3 that is connected to the transmission / reception unit 2 and performs digital processing of transmission / reception signals, and a digital processing unit 3, an audio processing unit 4 that performs audio processing, a speaker 5 and a microphone 6 that are connected to the audio processing unit 4, a control unit 7 that performs overall control of the mobile communication device 20, and a communication that is connected to the control unit 7. 3 includes an SRAM (Static Random Access Memory) 8 in which necessary data is stored, an operation unit 9 such as a dial button, and a display unit 10 such as a liquid crystal.

  The mobile communication device 20 further includes a contactless card 12. The contactless card 12 is provided with an antenna 11 and a crystal oscillator (OSC) 13, and exchanges signals with the control unit 7 and is controlled in operation by the control unit 7.

  A reception level signal rx-level is output from the transmission / reception unit 2 to the control unit 7, and a transmission power control signal c-tx and a reception power control signal c-rx are output from the control unit 7 to the transmission / reception unit 2. The contactless card power control signal c-card is output from the unit 7 to the contactless card 12.

  FIG. 2 is an operation timing chart of the contactless card-mounted mobile communication device shown in FIG. The transmitting / receiving unit 2 of the mobile communication device 20 constantly receives a control signal from a base station (not shown), but intermittently receives a control signal from the base station in order to reduce power consumption. For example, the cycle time for intermittent reception is 720 ms, the time for receiving the necessary control signal A from the base station is 20 ms, and when the control signal A is not received, the reception power control signal c-rx is turned off. Yes.

  When the mobile communication device 20 in the intermittent reception state reads out the storage information of the built-in contactless card 12, for example, balance information, and displays it on the display unit 10, the noncontact card 12 is supplied from the control unit 7. The contact card power control signal c-card is turned on to cause the crystal oscillator 13 to oscillate the OSC signal 13.56 MHz necessary for the operation of the non-contact card 12. Thereby, the contactless card 12 can transfer necessary information to the control unit 7.

  At this time, in the mobile communication device 20 according to the present embodiment, the control unit 7 prevents the oscillation signal (OSC signal) of the crystal oscillator 13 from destroying the reception data of the control signal from the base station as radiation noise. After confirming that the reception power signal c-rx to be output to the transmission / reception unit 2 is turned off, the contactless card power control signal c-card to be given to the contactless card 12 is turned on.

  The crystal oscillator 13 of the non-contact card 12 starts oscillation at 13.56 MHz in response to the ON signal of the non-contact card power control signal c-card, and the non-contact card 12 executes the non-contact card operation process # 1. .

  In the transmission / reception unit 2, the reception power control signal c-rx is turned on (this on signal is turned off after 20 ms as described above), and immediately before 720 ms which is an intermittent reception cycle elapses. 7 instructs the contactless card 12 to end the contactless card operation process # 1, and turns off the contactless card power control signal c-card after the contactless card operation process # 1 ends. As a result, the crystal oscillator 13 stops the oscillation operation.

  Thereafter, when the control unit 7 turns on the reception power signal c-rx to be given to the transmission / reception unit 2, the transmission / reception unit 2 starts receiving the next control signal A transmitted from the base station. When the reception of the control signal A from the second base station is completed, the control unit 7 turns off the reception power control signal c-rx.

  Then, after confirming that the second reception power control signal c-rx is turned off, the contactless card power control signal c-card is turned on again. As a result, the crystal oscillator 13 starts oscillation at 13.56 MHz, and the non-contact card 12 executes the non-contact card operation process # 2.

  Further, immediately before 720 ms elapses after the reception power supply control signal c-rx is turned on, the control unit 7 commands the contactless card 12 to end the contactless card operation process # 2, and the contactless card operation process # 2 Is completed, the contactless card power control signal c-card is turned off, and the oscillation operation of the crystal oscillator 13 is stopped.

  Thereafter, similarly, when there is a request for operation of the contactless card 12, the control unit 7 is contactlessly synchronized with the on / off of the reception power control signal c-rx synchronized with the intermittent reception with the base station. By repeatedly turning off and on the card power control signal c-card, the contactless card operation process is intermittently performed.

  In this way, while the control signal A sent from the base station is being received, the oscillation operation of the crystal oscillator 13 is stopped, so that the possibility of destruction of received data due to the operation of the contactless card is avoided. .

  During the intermittent reception with the base station, the mobile communication device 20 pauses the intermittent reception and continuously receives for several seconds in order to confirm information between the base station and the mobile communication device. There is a case. At this time, since the reception is continuously performed, the operation of the contactless card is not performed, the priority is given to the reception operation from the base station, and “Reading the card. Please wait” is displayed on the display unit 9. After continuous reception is completed, contactless card operation processing is performed.

  Also, when the mobile communication device 20 is in a tunnel or in a place where radio waves do not reach in the mountains, it cannot receive a control signal from the base station, and thus cannot receive intermittently. At this time, the mobile communication device 20 is in a battery saving state in order to reduce power consumption, and prohibits the operation of the contactless card for a few seconds while the receiver power of the transmitter / receiver is turned on to search for radio waves. When the power of the receiving unit is turned off for several tens of seconds after several seconds, the operation processing of the contactless card is performed.

  Furthermore, the control unit 7 of the mobile communication device 20 also performs operation control of the contactless card according to the reception level rx-level. FIG. 3 is a graph showing an error rate of received data with respect to the magnitude of the reception level. When the reception level is low, the influence of radiation noise increases and the error rate of received data increases.

  Therefore, the control unit 7 monitors the reception level. When the reception level is higher than the set level, the influence of the radiation noise due to the oscillation signal of the crystal oscillator 13 is small, and therefore the non-contact card of the non-contact card at the conventional timing of FIG. When the operation control is performed and the reception level is less than the set level, the operation control of the contactless card is performed at the timing shown in FIG.

  That is, for example, when the reception level is “medium” (corresponding to two antenna displays displayed on the screen of the mobile phone) or higher, the crystal oscillation of the contactless card is being received even while the control signal A is being received from the base station. When the operation control for oscillating the child 13 is performed and the reception level is “low” (corresponding to one antenna display) or less, the operation of the contactless card is prohibited during reception of the control signal A from the base station. In the case of continuous reception, the information on the contactless card can be read at any time without waiting time when the reception level is “medium” or higher.

  Since the mobile communication device according to the present invention is not affected by noise due to the oscillation signal of the contactless card, it is useful as a contactless card-mounted mobile communication device.

1 is a block diagram of a contactless card-mounted mobile communication device according to an embodiment of the present invention. Operation timing chart of contactless card mounted mobile communication device according to one embodiment of the present invention The graph which shows the relationship between the reception level and reception data error rate which are used for operation | movement description of the non-contact card mounting-type mobile communication apparatus which concerns on one Embodiment of this invention. Operation timing chart of conventional contactless card-mounted mobile communication device

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 High frequency antenna 2 Transmission / reception part 7 Control part 10 Display part 12 Contactless card 13 Crystal oscillator 20 Mobile communication apparatus c-rx Reception power supply control signal c-card Contactless card power supply control signal rx-level Reception level signal

Claims (4)

  A transmission / reception unit that intermittently receives a control signal from a base station, a contactless card that oscillates an oscillator during operation, and a control unit that operates the contactless card when the transmission / reception unit does not receive the control signal A contactless card-mounted mobile communication device.   The control means prohibits the operation of the contactless card when detecting that the transmission / reception unit has shifted from the intermittent reception operation to the continuous reception operation, and terminates the continuous reception operation to stop the intermittent reception. The contactless card-mounted mobile communication device according to claim 1, wherein the contactless card is operated after restarting.   When the control means cannot receive a control signal from the base station, the control means shifts from the intermittent reception state to the battery saving state and stops the reception operation of the transmission / reception unit while The contactless card-mounted mobile communication device according to claim 1, wherein the mobile communication device is operated.   The control means compares the reception level of the control signal with a set level when operating the non-contact card, and if the reception level is weaker than the set level, the control means The contactless card-mounted mobile communication device according to claim 1, wherein the contactless card is operated regardless of whether the control signal is received or not when the reception level is higher than the set level. .

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