JP2010113560A - Reader/writer and authentication system using the same - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To change a threshold of reception intensity by which a wireless communication function of a SIM card determines that a reception signal is present and to change a transmission output for transmitting a signal in accordance with a structure of a portable terminal device in which the SIM card is inserted. <P>SOLUTION: A reader/writer 150 receives a response signal (SIG402) including a reception intensity value of an authentication level setting signal (SIG401) and a response signal (SIG404) including a reception intensity value of an authentication level setting signal (SIG403), compares the reception intensity value of the setting signal (SIG401) with the reception intensity value of the setting signal (SIG403), and stores a grater reception intensity value (X). Then, the reader/writer 150 specifies an antenna (antenna P) which has been used in obtaining the reception intensity value (X) to decide an antenna to be used for transmitting a signal to be transmitted from the reader/writer 150 in an authentication phase. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a reader / writer device that performs wireless communication via a SIM card that is mounted on a mobile terminal device and has a wireless communication function, and an authentication system that includes the reader / writer device and the mobile terminal device.

  2. Description of the Related Art In recent years, some mobile terminal devices typified by mobile phones can insert and remove SIM (Subscriber Identity Module) cards. The mobile terminal device is in physical contact with the SIM chip provided in the SIM card, and performs data write processing to the SIM chip or data read processing from the SIM chip via the contact location.

Further, Patent Document 1 discloses a portable terminal device that can insert and remove a SIM card further provided with an RF-ID (Radio Frequency Identification) tag. The RF-ID tag performs data communication with the reader / writer device by performing data write processing to the SIM chip or data read processing from the SIM chip.
Special table 2007-507766 gazette

  However, it is assumed that the SIM card is inserted into and removed from mobile terminal devices having various structures. However, since the structure in the vicinity of the SIM card when inserted into the mobile terminal device differs for each mobile terminal device, the SIM card is provided in the SIM card. The radio wave environment of the RF-ID tag is also different. For example, when the SIM card is inserted at a position facing the battery provided in the mobile terminal device and when it is inserted at a position away from the battery, the SIM card is at a position separated by a certain distance. The reception intensity of radio waves received by the RF-ID tag from the reader / writer device tends to be smaller in the former.

  As described above, the RF-ID tag included in the SIM card changes the radio wave environment, particularly the reception intensity of the radio wave received by the RF-ID tag, according to the structure of the mobile terminal device into which the SIM card is inserted. The threshold value of the minimum reception intensity required for the RF-ID tag to perform wireless communication is set according to the portable terminal device having the structure with the lowest reception intensity of radio waves received by the RF-ID tag. There is a need. As a result, the RF-ID tag receives a radio wave with a low reception intensity as a radio wave for radio communication, and the influence on the radio communication due to noise increases. For this reason, according to the structure of the portable terminal device in which the SIM card is inserted, it is required to set a threshold value of reception strength that the RF-ID tag requires at least in order to perform wireless communication.

  Similarly, when the SIM card is inserted in a position facing the back side of the battery of the mobile terminal device, when inserted in a position facing the front side of the battery, or away from the battery When compared with the case where it is inserted at the position, the transmission output of the signal transmitted from the RF-ID tag for making the reception level constant at the reader / writer device located at a certain distance is different. Therefore, it is required to set the transmission output level of the RF-ID tag for performing wireless communication according to the structure of the mobile terminal device into which the SIM card is inserted.

  The present invention has been made in view of the above circumstances, and is a SIM card that can be inserted into and removed from a mobile terminal device and further has a wireless communication function, and the SIM card has a structure depending on the structure of the mobile terminal device to be inserted. It is an object of the present invention to provide a SIM card capable of suitably setting a reception intensity threshold value for determining that there is a reception signal by the wireless communication function and a transmission output when transmitting a signal.

  In order to solve the above-described conventional problems, a reader / writer device according to the present invention is a reader / writer device that performs wireless communication with a mobile terminal device on which a SIM card having a wireless communication function is mounted, and the mobile terminal device Antenna means for performing wireless communication with the wireless communication means, and wireless communication control means for controlling wireless communication via the antenna means, wherein the antenna means is different from the first antenna section and the first antenna section. The wireless communication control means transmits an authentication level setting signal to the mobile terminal device using each of the first antenna unit and the second antenna unit, A response signal including each reception strength value of the authentication level setting signal is received from the portable terminal device to detect the respective reception strength, and each of the detected reception levels is detected. Based on the intensity value is to determine whether to use or using said first antenna portion and the second antenna portion at the time of wireless communication to the portable terminal device.

  Thereby, regardless of how the user holds and holds the mobile terminal device, the angle between the reader / writer device and the mobile terminal device, the mounting position of the SIM card and the structure of the mobile terminal device, the mobile terminal device can be accurately connected. Since the distance is detected and the reader / writer device and the mobile terminal device perform authentication communication only within a predetermined distance, security and operability can be improved.

  In order to solve the conventional problem, an authentication system of the present invention includes a portable terminal device on which a SIM card having a wireless communication function is mounted and the reader / writer device described above.

  As a result, regardless of how the user holds and holds the portable terminal device, the angle between the reader / writer device and the portable terminal device, the mounting position of the SIM card and the structure of the portable terminal device, the reader / writer device can be accurately connected. Since the distance is detected and the reader / writer device and the mobile terminal device perform authentication communication only within a predetermined distance, security and operability can be improved.

  The reader / writer device and the authentication system according to the present invention determine whether to use the first antenna unit or the second antenna unit when performing wireless communication with the mobile terminal device based on the received intensity value transmitted from the mobile terminal device. Therefore, regardless of how the user holds and grips the mobile terminal device, the angle between the reader / writer device and the mobile terminal device, the mounting position of the SIM card, and the structure of the mobile terminal device, the mobile terminal is accurate. It is possible to improve security and operability by performing authentication communication with the device.

  If the portable terminal device can detect the portable terminal identification ID of its own device (mobile terminal device) from the correspondence table (step 703, Y), the reception level and transmission level corresponding to the portable terminal identification ID are set. Read (step 704), the read reception level, a control signal for requesting the radio circuit 122 to perform radio communication by receiving a radio wave having a reception intensity exceeding the reception level, the read transmission level, and the transmission A control signal for requesting the wireless circuit 122 to perform wireless communication at the level is output to the SIM chip 121 (step 705).

On the other hand, if the mobile terminal device cannot detect the mobile device identification ID of the mobile device (mobile terminal device) from the correspondence table read from the SIM chip 121 (step 703, N), the mobile device (mobile terminal) The device user is notified by a display, a speaker, or a vibration that the portable terminal identification ID of the device is not in the correspondence table (step 706).

  After step 706, the mobile terminal device manually sets the reception intensity threshold and the transmission output received by the radio circuit 122 of the SIM card 120 (that is, as shown in the first embodiment, only a certain distance). The reception intensity of the radio wave received by the wireless circuit 122 from the reader / writer device 150 at a remote position or the transmission output of the radio wave transmitted from the wireless circuit 122 to the reader / writer device 150 is measured, and the measured reception intensity and numerical value of the transmission output are measured. A message that prompts the apparatus user to perform this process (as in the case of calculating the reception level and transmission level based on the above) may be output on the display (step 707).

  When the manual setting of the reception level and the transmission level is completed (step 708, Y), the mobile terminal device receives the set reception level and a radio wave having a reception intensity exceeding the reception level, and performs wireless communication with the radio circuit 122. The control signal for requesting to perform communication and the read transmission level and the control signal for requesting the wireless circuit 122 to perform wireless communication at the transmission level are output to the SIM chip 121 (step 709) and A control signal for requesting to newly store the correspondence between the portable terminal identification ID of the (mobile terminal device) and the set reception level and transmission level in the correspondence table is output to the SIM chip 121 (step 710).

  The reception level and transmission level read from the SIM chip 121 in the process of step 704 or the reception level and transmission level manually set in the process of step 708 and the identification of the SIM card 120 read from the SIM chip 121 ID is memorize | stored in the memory | storage part 141 of an own apparatus (mobile terminal device) (step 711 or step 712).

  As described above, according to the mobile terminal device of the embodiment of the present invention, by setting the reception level and transmission level of radio waves received by the radio circuit 122 included in the SIM card 120 to the optimal values calculated in advance, the mobile terminal The wireless circuit 122 can perform wireless communication at a transmission / reception level suitable for the structure of the device.

  The processing described with reference to the flowchart of FIG. 7 refers to the correspondence table stored in the SIM chip 121 of the SIM card 120 by the mobile terminal device, and the reception strength of the radio wave received by the wireless circuit 122 of the SIM card 120 The threshold value and the transmission output were controlled. As another form, when the SIM card 120 is inserted once, the portable terminal device stores the correspondence table read from the SIM chip 121 of the SIM card 120 in the storage unit 132 of the portable terminal device, and then When the SIM card 120 is removed from the portable terminal device 110 and reinserted, the radio waves received by the wireless circuit 122 of the SIM card 120 are received with reference to the correspondence table stored in the storage unit 132 of the portable terminal device. It is also possible to control the intensity threshold and the transmission power. According to this, the mobile terminal device can immediately control the transmission / reception strength of radio waves communicated by the radio circuit 122 of the SIM card 120 to the SIM card 120 that has been inserted once.

  As another form of FIG. 7, the SIM card 120 can read the mobile terminal identification ID when it is attached to the mobile terminal device. FIG. 8 shows a processing flow of the SIM card 120 in this case. First, when the SIM card 120 is attached to the mobile terminal device, the control unit 143 reads the mobile terminal identification ID from the mobile terminal device via the mobile terminal connection unit 142 (step 801). Then, the control unit 143 searches whether the read portable terminal identification ID is written in the correspondence table stored in the storage unit 141 (step 802).

  If the mobile terminal identification ID can be searched in step 802 (step 803, Y), the control unit 143 reads the reception level and transmission level corresponding to the mobile terminal identification ID from the correspondence table (step 804). As a result, it is determined whether or not the reception data received by the wireless circuit 122 can be received using the reception level read from the correspondence table as a threshold value. Similarly, transmission data transmitted from the wireless circuit 122 is also performed at the transmission level read from the correspondence table.

  On the other hand, if the portable terminal identification ID cannot be detected in step 802 (N in step 803), the apparatus user is notified by the display, speaker, or vibration of the portable terminal apparatus that the portable terminal identification ID is not in the correspondence table. (Step 805).

  Subsequent to step 805, the threshold of the reception strength received by the wireless circuit 122 and the transmission output transmitted by the wireless circuit 122 are set by means such as the method described in the first embodiment (step 805). (806, Y), the control unit 143 stores the reception level and transmission level corresponding to the mobile terminal identification ID in the storage unit 141 (step 807). When the reception intensity threshold and the transmission output are set in step 806, it is determined whether or not the reception data received by the wireless circuit 122 can be received with reference to the value. The transmission data transmitted from is performed at the transmission level read from the correspondence table.

  As described above, according to the processing of the SIM card 120 illustrated in FIG. 8, the reception level of the radio wave received by the radio circuit 122 included in the SIM card 120 and the transmission level of the radio wave transmitted by the radio circuit 122 are calculated in advance. By setting the value, the wireless circuit 122 can perform wireless communication at a reception level and a transmission level suitable for the structure of the mobile terminal device.

  Note that information about a correspondence table including a SIM identification ID corresponding to a portable terminal identification ID of the portable terminal device, and reception level and transmission level information via the cellular transceiver 131 provided in the portable terminal device. The correspondence table may be received and stored in the storage unit 141 via the portable terminal connection unit 14. With this configuration, the reception level and transmission level to be set in the SIM card can always be updated to the latest one.

  As described above, the portable terminal device and the reader / writer device according to the present invention have the user's method of holding and gripping the portable terminal device, the angle between the reader / writer device and the portable terminal device, the mounting position of the SIM card and the portable device. Since communication is performed accurately regardless of the structure of the terminal device, the present invention can be applied not only to the portable terminal device but also to a device provided with a transmission / reception unit inside the device.

The perspective view of the portable terminal device of Embodiment 1 of this invention Functional block diagram of portable terminal device and SIM card of Embodiment 1 of the present invention Functional block diagram of the reader / writer device according to the first embodiment of the present invention. Sequence diagram of initial setting phase in portable terminal device and reader / writer device of embodiment 1 of the present invention Sequence diagram of authentication phase in portable terminal device and reader / writer device of embodiment 1 of the present invention The figure which shows an example of the corresponding | compatible table which the SIM card of Embodiment 2 of this invention memorize | stores. The flowchart showing the flow of the process by the portable terminal device of Embodiment 2 of this invention. The flowchart showing the flow of the process by the portable terminal device of Embodiment 2 of this invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 110 Portable terminal device 111 Battery 112 Cover 120 SIM card 121 SIM chip 122 Wireless circuit 131 Cellular transmission / reception part 132 Storage part 133 SIM card connection part 134 Control part 141 Storage part 142 Portable terminal connection part 143 Control part 144 Near field wireless transmission / reception part 145 Security storage unit 150 Reader / writer device 151 Short-range wireless transmission / reception unit 152 Control unit 153 Storage unit 154 External communication unit

Claims (4)

A reader / writer device that performs wireless communication with a mobile terminal device equipped with a SIM card having a wireless communication function,
Antenna means for performing wireless communication with the portable terminal device;
Wireless communication control means for controlling wireless communication via the antenna means,
The antenna means includes a first antenna unit and a second antenna unit installed at a position different from the first antenna unit,
The wireless communication control means transmits an authentication level setting signal to the mobile terminal apparatus using each of the first antenna unit and the second antenna unit, and includes a response strength value of each of the authentication level setting signals Whether to use the first antenna unit when receiving a signal from the mobile terminal device, detecting the respective reception intensity values, and performing wireless communication to the mobile terminal device based on the detected reception intensity values A reader / writer device that determines whether to use the second antenna unit. The wireless communication control means includes
If the reception intensity value obtained using the first antenna unit is larger than the reception intensity value obtained using the second antenna unit, the first antenna unit is used when performing wireless communication with the mobile terminal device. Judgment
If the reception intensity value obtained using the first antenna unit is equal to or less than the reception intensity value obtained using the second antenna unit, the second antenna unit is used when wirelessly communicating with the mobile terminal device. The reader / writer device according to claim 1, wherein the reader / writer device is determined. The wireless communication control unit stores a larger received intensity value of a received intensity value obtained using the first antenna unit and a received intensity value obtained using the second antenna unit in the storage unit. And receiving the wireless message transmitted from the portable terminal device, obtaining a received strength value of the wireless message, and comparing the received strength value with the received strength value stored in the storage means. 3. The reader / writer device according to 2. A portable terminal device equipped with a SIM card having a wireless communication function;
A reader / writer device according to any one of claims 1 to 3,
An authentication system comprising:

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