JP3072339B2 - ID identification method and IC card in non-contact IC card system - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a non-contact IC card system comprising an IC card and an external parent device communicating with the IC card in a non-contact manner. The present invention relates to a method of identifying an ID signal transmitted from each IC card in response to a call signal when a plurality of IC cards receive the same at the same time.

[0002]

2. Description of the Related Art Conventionally, there is an IC card in which a memory and a CPU are embedded in a credit card or a cash card. This IC card can read data from an external parent device into a CPU via an electrode terminal, collate the data with data in a memory, rewrite the contents of the memory, and change the magnetization in a magnetic stripe. The storage capacity is larger than that of a conventional credit card in which data is written by changing the arrangement of the information, and the information is excellent in terms of confidentiality of information.

[0003] However, since an external device, such as a reader / writer, is contacted via the electrode terminal, the operation may be complicated for a user who carries the card. Therefore, a non-contact IC card has been used as a solution to this problem.

[0004] The non-contact IC card is provided with a transmission / reception circuit, a transmission / reception control circuit, and the like in the main body of the IC card. Write or read data to or from the memory. According to this, there is an advantage that it is not necessary to insert the card into the reader / writer each time.

[0005] Attention has also been focused on a composite IC card in which a contact IC card and a non-contact IC card are embedded in one IC card. According to this composite IC card, it is possible to selectively use the function of inputting / outputting data by contact with an external parent device and the function of transmitting / receiving data without contact as necessary. It is convenient.

[0006]

However, a non-contact I / O having a function of transmitting and receiving data in a non-contact manner as described above.
The C card and the complex IC card have the following problems.

When the external parent device transmits a calling signal to an unspecified IC card, and the plurality of IC cards simultaneously receive the calling signal, the plurality of IC cards simultaneously respond to the calling signal and each ID card receives the ID signal. When the signals are transmitted, the external parent device may be unable to identify the ID signal due to mutual interference or the like, and may assume that there is no response. In other words, there is a problem that the external parent device regards the IC card as not existing in its own management area.

In view of the above, the present invention has been made in view of the above-mentioned problems. When a plurality of IC cards simultaneously receive a call signal transmitted by an external parent device, an ID transmitted in response to the call signal is transmitted. A technical object is to make a signal identifiable by an external parent device.

[0009]

According to the present invention, the following is provided in order to solve the above-mentioned problems. This will be described based on the principle diagram shown in FIG.

The non-contact IC card system according to the present invention comprises a plurality of IC cards 1 and an external parent device 2 for communicating data with them without contact. Each of the IC cards 1 includes a receiving unit 3 and a transmitting unit 5 for performing non-contact transmission / reception with the external parent device 2, and a random time generation for generating an indefinite random time for each IC card. Means 4,
Control means 6 for controlling transmission and reception with the external parent device 2
And

When the general call signal is received from the external parent device 2 by the receiving means 3, the control means 6 activates the random time generating means 4 to count the random time,
After the elapse of the disturbance time, a response ID signal of the paging is transmitted to the external parent device 2 through the transmission means 5.

Further, preferably, the control means 6 comprises:
When the response ID information is transmitted, the random time generating means 4 is activated, and if a reception confirmation signal for the response ID information is not transmitted from the external parent device 2 within the random time, the response ID is re-transmitted after the random time elapses. Preferably, a signal is transmitted.

The turbulence time generating means 4 is provided for each I
A memory 4a in which a different value is registered for each C card and a counter 4b for loading and subtracting the value are provided. As means for generating a random time, the following can be considered.

First, an ID specified for each IC card is registered in the memory 4a, and the control means 6 receives the general call signal from the external device 2 and, when the paging signal is received from the external device 2, registers the ID of the memory 4a. To access.

Second, an indefinite value (random number) is registered in a continuous address of the memory 4a, and the control means 6 changes the address of the memory 4a every time a general call signal from the external parent device 2 is received. Access by shifting by a certain value.

[0016]

According to the present invention, when a plurality of IC cards receive a paging signal from an external parent device, each IC card transmits its own ID signal to the external parent device via the transmitting means. At the same time, the turbulence time generating means is activated.

If the external master device does not transmit a reception acknowledgment signal for the response ID information within the disturbance time, the response ID is re-transmitted when the disturbance time elapses.
Send a signal to the external parent device.

At this time, since the value differs for each IC card, when the response ID signal is transmitted again from each IC card, the transmission timing differs for each IC card. Then, the external parent device receives the ID signal in order from the IC card with the smaller value, that is, the IC card that transmitted the response ID signal earlier.

Here, as the transmitting means and the receiving means, for example, a transceiver using electromagnetic waves, light, electrostatic coupling, magnetism or the like as a transmission medium can be used. Further, the external parent device can use a transmitter / receiver capable of handling a transmission medium corresponding to an IC card, and a central processing unit (CPU) or a small processing unit (MPU) can be used as a control unit.

[0020]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, specific embodiments of the present invention will be described. (Embodiment 1) FIG. 2 is a schematic configuration diagram of a non-contact IC card system in Embodiment 1.

The contactless IC card system according to the first embodiment includes a plurality of IC cards 7 and a transmitter / receiver 8 as an external parent device. The specific configuration of the transmitter / receiver 8 will be described later.

Each IC card has a thin rectangular parallelepiped IC card main body 7, a wireless communication device 9 as a transmitting means and a receiving means according to the present invention, a random time generator 11, a processor 10, and a main memory 14. The data bus 13 can exchange data with each other.

The wireless communication device 9 communicates with a transmitter / receiver 8, which is an external parent device, in a non-contact manner via a transmission medium such as an electromagnetic wave or light. The specific configuration of the wireless communication device 9 will be described later.

The random time generator 11 is a device for generating an indefinite random time for each IC card, and its specific configuration will be described later. The main memory 14 stores an ID for specifying each IC card and other data.

The processor 10 as control means processes data transmitted to and received from the transmitter / receiver 8, and controls communication performed between the transmitter / receiver 8 and the main memory 14 via the radio communication device 9. , And the disturbance time generator 11 are controlled.

The battery 12 is, for example, a sheet battery and supplies power to each unit. FIG. 3 shows the wireless communication device 9.
FIG. 2 is a configuration block diagram showing communication between a transmitter and a transmitter / receiver 8;

The data processing unit 24 performs signal processing on the output of the processor 10 or the output of the modulation / demodulation circuit 15. The modulation / demodulation circuit 15 modulates the output of the data processing unit 24 with a radio signal (carrier signal). Alternatively, the output of the wireless transmission / reception unit 16 is demodulated with a (carrier signal).
Note that a microwave or the like can be used as the wireless carrier signal.

The radio transmission / reception unit 16 transmits the output of the modulation / demodulation circuit 15 from the antenna 17 to the antenna 18 or receives a signal from the antenna 18 via the antenna 17.

On the other hand, the transmitter / receiver 8 also has the same configuration as that of the radio communication device 9 and includes a radio transmission / reception unit 19, a modulation / demodulation circuit 20, a data processing unit 21, and an antenna 18.

Here, when data is transmitted from the radio communication device 9 to the transmitter / receiver 8, the data processed by the data processing unit 24 is modulated by the modulation / demodulation circuit 15, and the modulated data is transmitted by the radio transmission / reception unit 16 With antenna 1
7 to the transmitter receiver 8. In this way, data can be transmitted and received between the wireless communication device 9 and the transmitter / receiver 8 in a non-contact manner using, for example, a microwave as a transmission medium.

FIG. 4 shows the configuration of the turbulence time generator 11 in the first embodiment. The memory 22 registers an ID value, which is an identification number for identifying each IC card 7, and a counter 23 is activated by a command from the processor 10 and stores the ID value registered in the memory 22. Load and subtract that value.

For example, when the ID value shown in the figure is 29, the counter 23 decrements the 29 by 1 every second. Therefore, in the contactless IC card system according to the first embodiment, when the simultaneous call signal is issued from the transmitter / receiver 8, the IC card 7 in the communicable range of the transmitter / receiver 8 includes the processor 1
0 receives the paging signal via the wireless communication device 9 and sends a start command to the random time generator 11.

In the turbulent time generator 11, individual ICs
The counter 23 loads the ID value, which is an identification number that differs for each card, from the memory 22 and subtracts it. For example, taking the example shown in FIG.
The subtraction of value = 29 is performed one by one every second to generate a disturbance time of 29 seconds.

The processor 10 transmits the ID stored in the main memory 14 to the transmitter / receiver 8 via the radio communication device 9 after the end of the subtraction of the ID value, that is, 29 seconds later.

The transmitter / receiver 8 can recognize the presence of the IC card in order from the IC card to which the ID response has been made. (Embodiment 2) The configuration of a contactless IC card system according to Embodiment 2 is the same as that of Embodiment 1 described above, and includes a plurality of IC cards 7 and a transmitter / receiver 8 as an external parent device.

The transmitter / receiver 8 has an antenna 18, a radio transmission / reception unit 19, a modulation / demodulation circuit 20, and a data processing unit 21. Each IC card has a thin rectangular parallelepiped IC card main body 7, a wireless communication device 9 as a transmitting means and a receiving means according to the present invention, a random time generator 11, a processor 10, and a main memory 14. Data can be transmitted and received between the devices via the data bus 13.

Here, the random time generator 11 according to the second embodiment is characterized in that, unlike the configuration of the first embodiment, different indefinite values are registered for the individual IC cards at the continuous addresses of the memory 22. It is assumed that. This configuration is shown in FIG.

The indefinite values 15, 5, 37,... Sequentially from a continuous address of the memory 22, for example, address 001 in the figure.
・ It has been registered. The counter 23 shifts the address and loads an indefinite value each time the paging signal is received from the transmitter / receiver 8.

Therefore, in the non-contact IC card system according to the second embodiment, when the simultaneous call signal is issued from the transmitter 8, the
0 indicates that the call signal is received via the wireless communication device 9 and a start command is sent to the random time generator 11, and an arbitrary address of the memory 22 of the random time generator 11, for example, as shown in FIG. For example, an address 001 is accessed to load an indefinite value 15 into the counter 23.

The counter 23 increments the indefinite value 15 by 1 every second.
Each subtraction generates a 15 second turbulence time. After completion of the subtraction of the counter 23, that is, 15 seconds after the reception of the paging signal, the processor 10 sets the main memory 1
4 transmits the ID of the IC card stored in 4 to the transmitter / receiver 8 via the wireless communication device 9.

The transmitter / receiver 8 can recognize the existence of the IC card 7 to which the response ID has been transmitted from each IC card 7 in order. Third Embodiment FIG. 6 shows a schematic configuration of a non-contact IC card system according to a third embodiment. The same components as those in the first embodiment or the second embodiment are denoted by the same reference numerals.

The non-contact IC card system according to the third embodiment includes a plurality of IC cards 7 and a transmitter 8 as an external parent device. The transmitter / receiver 8 has the same configuration as that of the above-described first or second embodiment, and includes an antenna 18, a radio transmission / reception unit 19, a modulation / demodulation circuit 20, and a data processing unit 21.

Each IC card has a thin rectangular parallelepiped IC card body 7, a wireless communication device 9 as a transmitting means and a receiving means according to the present invention, a processor 10,
A main memory 14 is provided, and data can be exchanged between them via the data bus 13.

Here, the random value generator 11 according to the first or second embodiment stores an indefinite value to be registered in the memory 22 in the main memory 14 and a counter 23.
The processor 10 can perform the subtraction of the indefinite value to be performed.

Therefore, the non-contact IC card system according to the third embodiment is different from the first and / or the second embodiment described above.
Can perform the same function as. (Embodiment 4) FIG. 7 is a block diagram showing the configuration of an IC card system according to Embodiment 4.

The contactless IC card system according to the fourth embodiment includes a plurality of IC cards 7 and a transmitter 8 as an external parent device. The transmitter / receiver 8 has the same configuration as that of the above-described first to third embodiments, and includes an antenna 18, a wireless transmission / reception unit 19, a modulation / demodulation circuit 20, and a data processing unit 21.

Each IC card has a thin rectangular parallelepiped IC card body 7, a wireless communication device 9 as a transmitting means and a receiving means according to the present invention, a processor 10,
It has a main memory 14, a turbulence time generator 11, and a timer 25, and data can be exchanged between them via the data bus 13.

The timer 25 counts a specific time set in advance. The operation of the turbulence time generator 11 in the fourth embodiment is based on the operation in the first or second embodiment. You.

Therefore, according to the fourth embodiment, when a paging signal is issued from the transmitter / receiver 8, the processor 10 of each IC card 7 within the communicable range of the transmitter / receiver 8 causes the processor 10 to perform wireless communication. Machine 9
And receives the paging signal via
The response ID signal of the C card 7 is transmitted from the wireless communication device 9 and the timer 25 is started.

If the reception confirmation signal for the response ID signal is not transmitted from the transmitter / receiver 8 by the time when the counting of the specific time by the timer 25 is completed, the processor 10 sets the disturbance time after the completion of the counting of the specific time. The generator 11 is activated, and the response ID signal is transmitted again after the elapse of the random time.

Thus, the transmitter / receiver 8
When there are a plurality of IC cards 7 within the communicable range of the IC card 7, the time at which the response ID signal is transmitted again from the IC card 7 differs depending on the individual IC card 7. 7 from the IC card to which the response ID has been transmitted can be recognized in order.

When only a single IC card 7 exists in the communicable range of the transmitter / receiver 8, the transmitter / receiver 8 uses the IC card 7.
Can identify the response ID signal transmitted first.

[0053]

According to the present invention, when a plurality of IC cards present within the communicable range of the external parent device simultaneously receive a paging signal from the external parent device, each IC card differs individually. A random time is generated, and a response ID signal can be transmitted to the external parent device after the random time elapses, so that interference between the response ID signals can be prevented.

Further, the external parent device can receive a response ID signal from each IC card existing within a communicable range.

[Brief description of the drawings]

FIG. 1 is a principle diagram of a contactless IC card system according to the present invention.

FIG. 2 is a schematic configuration diagram of a contactless IC card system according to the first embodiment.

FIG. 3 is a block diagram showing communication between a wireless communication device and a transmitter / receiver according to the embodiment;

FIG. 4 is a configuration diagram of a turbulence time generator according to the first embodiment.

FIG. 5 is a configuration diagram of a turbulence time generator according to a second embodiment.

FIG. 6 is a schematic configuration diagram of a contactless IC card system according to a third embodiment.

FIG. 7 is a configuration diagram of a contactless IC card system according to a fourth embodiment.

[Explanation of symbols]

 1. IC card 2. External parent device 3. Reception means 4. Random time generator 5. Transmission means 6. Control means 7. IC card 8. Transmitter / receiver 9. Wireless communication device 10, processor 11, random time generator 12, battery 13, bus 14, main memory 15, modulation and demodulation circuit 16, radio communication device 17, antenna 18, antenna 19, radio transmitter / receiver 20 ..Modulation / demodulation circuit 21.Data processing unit 22.Memory 23.Counter 24.Data processing unit 25.Timer

──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Toshimitsu Oba 1015 Kamidadanaka, Nakahara-ku, Kawasaki City, Kanagawa Prefecture Inside Fujitsu Limited (72) Inventor Kenji Morosawa 1015 Kamikodanaka, Nakahara-ku, Kawasaki City, Kanagawa Prefecture Fujitsu Limited ( 72) Inventor Kenji Suzuki 1015 Uedanaka, Nakahara-ku, Kawasaki City, Kanagawa Prefecture Inside Fujitsu Limited (72) Inventor Mitsuyuki Sasaki 1015 Kamiodanaka, Nakahara-ku, Kawasaki City, Kanagawa Prefecture Inside Fujitsu Limited (72) Inventor Tohru Monaga 1015 Ueodanaka, Nakahara-ku, Kawasaki City, Kanagawa Prefecture Inside Fujitsu Limited (56) References JP-A-1-201793 (JP, A) JP-A-63-276929 (JP, A) JP-A-62-287389 (JP, A A) JP-A-63-135036 (JP, A) JP-A-1-212140 (JP, A) JP-A-3-254541 (JP, A) (58) Fields investigated (Int. Cl. ⁷ , DB name) G06K 19/00-19/07 G06F 17/60 G06F 17/00

Claims (4)

(57) [Claims] 1. A non-contact IC card system comprising at least a plurality of IC cards having a built-in transmitting / receiving means and an external master device having a transmitting / receiving means for performing non-contact communication with said card. the de, the an external OyaSo placed et the receiving means to receive a paging signal, provided for each individual IC card, not in consecutive addresses
Load the memory where the fixed value is registered and the value from the memory
A turbulent time generator hand stages comprising a counter for subtracting by a transmitting means to transmit a response ID signal in response to said paging signal, a control means to control the transmission and reception between said external OyaSo location with the door, the control hand stage, when Oite receives the external OyaSo placed et paging signal to the receiving hands stage, the address for each reception of <br/> paging signal from the external master device Shift by a certain value
To obtain the random time by accessing the random time generating means,
The transmission non-contact IC card ID identification method in system response ID signal of the paging through the hand stage and transmits to the external OyaSo location after the random time has passed. Wherein the control hand stage, the external OyaSo put et paging signal when receiving for the receiving hands stage, the external master a response ID signal of the paging through the transmission manual stage and transmits for the equipment, if the turbulent time generator hand stages <br/> is activated, the reception confirmation signal to the external OyaSo placed et the response ID signal within the turbulent time is not transmitted, 2. The ID identification method in the non-contact IC card system according to claim 1, wherein the response ID signal is transmitted again after the elapse of the disturbance time. 3. An IC card having a built-in transmitting / receiving means, wherein: a receiving means for receiving a calling signal from an external device; a transmitting means for transmitting a response ID signal in response to the calling signal; Control means for controlling transmission / reception of a memory, a memory for registering an indefinite value in a continuous address, and a counter for loading and decrementing the indefinite value from the memory, wherein the control means comprises a calling signal from the external device. Receiving an indefinite value from the memory and loading the same into the counter when receiving by the receiving means, and sending the response ID signal when the counter by the counter ends. 4. The IC card according to claim 1, wherein the control unit shifts an address of the memory to access and reads the undefined value every time a call signal is received from the external device. 3. The IC card according to 3.