JP4834945B2 - Non-contact IC card control method - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a method of controlling a non-contact IC card that performs non-contact data communication with a communication target device and receives power supply by radio wave radiation.
[0002]
[Prior art]
Many IC cards are used today. Usually, a CPU, ROM, RAM, and the like are built in an IC card, and data is read and written through contacts exposed to the outside. However, the contact type IC card is inconvenient because it is necessary to insert the IC card into a card reader to read and write data. Therefore, a non-contact IC card is desired and used.
[0003]
This non-contact IC card receives power supply from an antenna provided in the card control unit, for example, and exchanges data with the card control unit. Usually, data communication (data update processing) between a card control unit and a non-contact IC card (hereinafter simply referred to as an IC card) is: (1) IC card capture processing, and (2) between the card control unit and the IC card. Mutual authentication processing, (3) data reading processing from the IC card, and (4) data writing processing to the IC card are sequentially performed.
[0004]
The above process is started simultaneously with the start of the update timer. If the update timer does not end within a predetermined time, the time-out occurs and the IC card data update process is stopped.
[0005]
[Problems to be solved by the invention]
However, since the conventional method uses a non-contact IC card, the interval between the card control unit and the IC card is not constant, and data transfer becomes unstable. In addition, since the timing at which the IC card is brought close to the card control unit is not constant depending on the user, a timeout may occur before the data update process is completed. This will be specifically described below.
(A) First, FIG. 8 shows an example in which the process times out before the data transfer is completed. As shown in the figure, the card controller first radiates radio waves and transmits a card capture command to the IC card. In this case, when the user does not bring the IC card close to the card control unit, power is not supplied to the IC card (card power off), and the card control unit continues to transmit the card capture command.
[0006]
After that, when the user brings the IC card closer to the card control unit at the timing near the timeout (timing a shown in the figure), the IC card detects a card capture command and sends a card capture response to the card control unit. To do. Thereafter, mutual authentication processing (authentication mode), data read processing (read / write mode), and data write processing (read / write mode) are executed in sequence, but since the IC card is brought close to timeout as described above, a predetermined time All processing is not completed within this time, timeout occurs, and power supply to the IC card is stopped.
[0007]
9 and 10 are also examples of timeout due to the elapse of a predetermined time. In this case, the operation of bringing the IC card closer to the card control unit was performed at an early timing (timing a 'shown in FIG. 9), but thereafter This is a case where the IC card has moved away to a position where it cannot receive radio waves after performing the authentication process (the case where the IC card has moved away at the timing b shown in FIG. 9). In this case, the card control unit transmits a status confirmation command, determines that there is no IC card, and stops emitting radio waves. After that, for example, when the user brings the IC card closer to the time up (when the IC card is approached at the timing b ′ shown in FIG. 10), the card does not have enough time to complete the subsequent processing, as described above. The update process times out and the power supply to the IC card stops.
(B) Also, in the example shown in FIGS. 11 and 12, the IC card is once brought close to the card control unit (timing a ′ shown in FIG. 11), and data transfer is started. This is an example of leaving. In this case, as described above, when the card control unit emits radio waves and transmits a card capture command to the IC card, power is supplied to the IC card, and the card capture process (capture mode), mutual authentication process (authentication mode), Data read processing (read / write mode) and data write processing (read / write mode) are sequentially executed. However, since the IC card is separated from the antenna (timing b shown in the figure), there is no response from the IC card.
[0008]
However, in this case, power is supplied from the antenna and the command can be received from the card control unit, but the response cannot be transmitted. For this reason, the card control unit outputs a status confirmation command and confirms on the IC card side, but cannot output a response from the IC card. For this reason, the card control unit outputs a status confirmation command and transmits a card capture command as shown in FIG. 12 in order to capture the IC card. However, in this case, the IC card side continues the read / write mode, the card capture command cannot be recognized, and transmission of radio waves is stopped.
[0009]
Therefore, also in this case, the card update process cannot be performed reliably.
(C) Further, in the above case, since the card control unit stops the card update process, the data is actually updated on the IC card side, but the process ends abnormally. That is, when the above problem occurs after data is written to the IC card, the IC card ends abnormally despite the data update.
[0010]
Therefore, the present invention provides a control method for a non-contact IC card that can secure a sufficient data writing time for the IC card and can reliably perform the data update process of the IC card.
[0011]
[Means for Solving the Problems]
According to the above problems the present invention of claim 1, wherein, radiates radio waves, and a power supply process for supplying power to the contactless IC card, and capture process that captures the non-contact IC card, before Symbol contactless IC card An authentication process for performing authentication, a data read process for reading data in the non-contact IC card after the authentication, and a data write process for writing data in the non-contact IC card after the data reading. a method for controlling a row cormorants contactless IC card, and the data writing processing is carried out time to is set the card update timer from the power supply process, the time for performing from the power supply processing to the capture process is set card A supplementary timer, and the set time of the card supplementary timer is set to the time when all the processes are completed within the set time of the card update timer after the supplementary processing. It is, when the supplementary process is not completed until the card supplementary timer set time, to terminate the radiation of the radio wave can be achieved by providing a control method of the non-contact IC card.
[0012]
Here, the non-contact IC card receives a radio wave supplied from an antenna provided in the card control unit and serves as a power source for the IC card. The predetermined time is sufficient for the mutual authentication processing, data reading processing, and data writing processing to be performed later. If the supplementary processing of the IC card is not completed within the predetermined time, radio wave emission is stopped. The card update process is canceled.
[0013]
By configuring in this way, when proceeding to the processing after the card supplement processing, the card update processing can be surely performed without time-out until the data writing processing.
[0015]
According to the second aspect of the present invention, there is provided a radiation stop process for stopping the emission of the radio wave when data communication with the non-contact IC card becomes impossible before the data writing process is completed. This can be achieved by providing a non-contact IC card control method for performing radio wave radiation processing for resuming radio wave radiation to the non-contact IC card after the radio wave radiation is stopped.
[0016]
With this configuration, the power supply to the IC card is stopped, the process from the card capturing process is performed again, and the IC card update process can be reliably performed.
[0017]
According to the third aspect of the present invention, there is provided a radiation stopping process for stopping the emission of radio waves when data communication with the non-contact IC card becomes impossible during the data writing process. Non-contact IC card which determines whether or not to perform data writing process again after stopping radiation and omits the data writing process and terminates the process when the data in the non-contact IC card has already been rewritten This can be achieved by providing a control method.
[0018]
The present invention determines the necessity of data writing before executing the data writing process, and performs the data writing process again only when the data has not been written yet.
By configuring in this way, the data update processing of the non-contact IC card can be performed at higher speed, and wasteful power consumption can be prevented.
[0019]
DETAILED DESCRIPTION OF THE INVENTION
Embodiments of the present invention will be described below with reference to the drawings.
<First Embodiment>
FIG. 1 is a system diagram illustrating a method for controlling a non-contact IC card according to the present embodiment. In the figure, a card control unit 1 is incorporated in a vending machine, for example, and exchanges data with an IC card. The card controller 1 is provided with an antenna 2 for supplying power to the IC card 3 by electromagnetic induction.
[0020]
The IC card 3 is a non-contact IC card that receives radio waves radiated from the antenna 2 and supplies power. Further, circuits such as a CPU, a ROM, and a RAM are formed inside the IC card 3, and various data are recorded therein. The card control unit 1 is also provided with a card update timer 4 and a card capture timer 5, which will be described later.
[0021]
First, basic processing of data communication performed between the card control unit 1 and the IC card 3 will be described. FIG. 2 is a flowchart for explaining this process. In this example, an example used in a vending machine is described. Data communicated between the card control unit 1 and the IC card 3 is, for example, monetary data or a subtraction corresponding to the price of a product. Data, etc.
[0022]
In the figure, for example, when a user selects a product of a vending machine, the card control unit 1 starts a data update process of the IC card 3 (step (hereinafter referred to as ST) 1). In this process, first, radio waves are radiated from the antenna 2 (ST2). Here, for example, when the user brings the IC card 3 close to the card control unit 1 according to the display on the display provided in the vending machine (c shown in FIG. 2), power is supplied to the IC card 3, and the IC card 3 The power of the will change from off to on.
[0023]
Next, the card control unit 1 sends a card capture command (ST3) and waits for a card capture response transmitted from the IC card 3. Thereafter, when a card capture response is transmitted from the IC card 3 (ST4), the card control unit 1 determines that the IC card 3 has been captured (ST5 is Y (YES)), ends the capture mode, and completes the authentication mode. Migrate to
[0024]
In this authentication mode, the card control unit 1 sends a mutual authentication command (ST6) and waits for a mutual authentication response from the IC card 3. The IC card 3 performs mutual authentication using, for example, encryption (ST7), and sends a mutual authentication response to the card control unit 1 (ST8). When the mutual authentication response is sent, the card control unit 1 determines that the mutual authentication is OK and shifts to the read / write mode (YES in ST9).
[0025]
In this read / write mode, first, a read command is sent (ST10), and data (for example, money data) recorded on the IC card 3 is read (ST11). The data (money data) recorded on the IC card 3 is data written in advance by a money data writer or the like. The IC card 3 reads the data and transmits it to the card control unit 1 as a read response (ST12).
[0026]
Next, the card control unit 1 transmits a write command to the IC card 3 (ST13). This write command is money data subtraction information in the above example, for example, data for subtracting the price of the product selected by the user.
[0027]
The IC card 3 performs a subtraction process corresponding to the write command (ST14) and transmits a write response to the card control unit 1 (ST15). By this transmission, the card control unit 1 determines that the writing process is OK (ST16 is YES), stops the emission of radio waves from the antenna 2, and completes the card update process (ST17).
[0028]
In the above process, the card renewal timer 4 is activated and ends within a predetermined time.
FIG. 3 is a list of state transitions (mode transitions) based on various command inputs. For example, the transition from the acquisition mode to the confirmation mode corresponds to (1) shown in FIG. The transition from the confirmation mode to the reading mode (reading / writing mode) corresponds to (2) shown in FIG.
[0029]
Next, based on the above basic processing, the present invention further uses a card capture timer. The card capture timer is the card supplement timer 5 shown in FIG. 1 described above, and functions under the control of the card control unit 1. The card update timer 4 shown in the figure is a card update timer conventionally used.
[0030]
Here, in this example, it is assumed that the time-up time of the card update timer 4 is 30 seconds and the time-up time of the card capture timer 5 is 10 seconds.
FIG. 4 is a flowchart for explaining the processing of this example, and, similar to the basic processing described above, after the user selects a product, the card control unit 1 starts the card update processing (step (hereinafter referred to as STP) 1 ). In this example, the card update timer 4 and the card capture timer 5 are started simultaneously with the start of the card update process.
[0031]
Next, radio waves are radiated from the antenna 2 (STP2) as described above, and power is supplied to the IC card 3. Then, a card capture command is transmitted (STP3), and a response of a card capture response is awaited from the IC card 3 as described above (STP4). This process is repeated until there is a card capture response.
[0032]
In this state, if the user delays the operation of bringing the IC card 3 closer to the card control unit 1, the IC card 3 is not turned on and the card capture command cannot be detected. Further, depending on the distance that the IC card 3 is brought close to, the radio wave radiation from the antenna 2 can be received, but the card capture response may not be transmitted.
[0033]
In such a case, in this example, the card capture timer 5 times up (STP5). At that time (10 seconds after the start of the card capture timer), the card control unit 1 determines whether or not a card capture response has been detected (STP6). Since it cannot be received (STP6 is N (NO)), the emission of radio waves from the antenna 2 is stopped (STP7).
[0034]
By processing in this way, when the card capture processing is delayed, the processing is stopped, and the adverse effects caused by performing the remaining processing (mutual authentication processing, data reading processing, data writing processing) in a short time, that is, card update Processing interruption due to timer 4 timeout is prevented.
[0035]
Therefore, by using the card capture timer 5 used in this example, the card can be updated without interrupting the data writing process or the like using a sufficiently long time (for example, a time of 20 seconds or more in this example). Processing can be realized.
[0036]
FIG. 5 is a flowchart illustrating an example of this case. That is, it is a flowchart when a card supplement response is sent within 10 seconds from the start of the card update process.
[0037]
In this case, as described above, the card update timer 4 and the card capture timer 5 are started simultaneously with the start of the card update process (STP1), radio waves are radiated from the antenna 2 (STP2), and a card capture command is further transmitted. (STP3), input of the card capture response sent from the IC card 3 is determined (STP4).
[0038]
In this case, within a predetermined time (in this example, within 10 seconds), the user brings the IC card 3 close to the card control unit 1 (d shown in FIG. 4), and as a result, the card capture response is sent to the card control unit 1. It is sent out (STP9). Therefore, before the card capture timer 5 expires, the card control unit 1 captures the card (STP 10 is YES) and uses the remaining time (in this example, at least 20 seconds or more) to From the authentication command transmission (STP11) to the radio wave radiation stop process (STP23), the data write process and the like are not interrupted.
[0039]
In the above example, the card update timer 4 has a timer time of 30 seconds and the card capture timer 5 has a timer time of 10 seconds. However, the present invention is not limited to this time.
<Second Embodiment>
Next, a second embodiment of the present invention will be described.
[0040]
In this example, after the IC card 3 is once captured, the IC card is separated for some reason, and the distance from the card control unit 1 is out of a certain range. Hereinafter, the processing will be described with reference to the flowchart shown in FIG.
[0041]
First, when the card update process is started as described above, radio waves are radiated from the antenna 2 (steps (hereinafter referred to as W) 1 and 2), and power is supplied to the IC card 3. Thereafter, when the user brings the IC card 3 close to the card control unit 1 (e shown in FIG. 6), the IC card 3 receives power supply from the card control unit 1 and the power is turned on.
[0042]
Next, a card capture command is sent from the card control unit 1 (W3), the IC card 3 transmits a card capture response (W4), and the card control unit 1 captures the IC card (W5 is YES). Further, a mutual authentication command is sent from the card control unit 1 (W6). After mutual authentication as described above, the IC card 3 transmits a mutual authentication response (W7, W8), and the card control unit 1 confirms the mutual authentication. (W9 is YES).
[0043]
Thereafter, the card control unit 1 sends a read command (W10), reads data recorded on the IC card 3 (W11), and sends a read response to the card control unit 1 (W12). Further, the card control unit 1 sends a write command to the IC card 3 (W13). Data writing processing is performed (W14). This data writing process is a monetary data subtraction process as described above, and the card control unit 1 waits for an input of the subtraction result.
[0044]
Here, in this example, the IC card 3 is separated from the card control unit 1, and the card control unit 1 cannot receive a write response (f shown in FIG. 6). Therefore, the card control unit 1 sends a status confirmation command and waits for a response (W15 is NO, W16). In this example, it is next determined that there is a card (W17), and if the IC card 3 cannot be recognized, the emission of radio waves is stopped (W18 shown in FIG. 7).
[0045]
Therefore, the power supply to the IC card 3 is cut off by the above processing, and the power source of the IC card 3 is cut off. Therefore, the IC card 3 once returns to the initial state.
Accordingly, radio wave radiation is resumed from the card control unit 1 (W19), and when the IC card 3 approaches a predetermined range (g shown in FIG. 7), the power of the IC card 3 is turned on and transmitted thereafter. A card capture command is detected (W20), and a card capture response is transmitted to the card controller 1 (W21). Therefore, the card control unit 1 can capture the IC card 3 (W22 is YES), and then performs the mutual authentication command transmission processing (W23) to the data read response reception (W29) as described above, and further performs the writing processing. To complete the card update process.
[0046]
As described above, according to this example, after the write command is sent, the IC card 3 moves to a remote position, and when the subsequent processing becomes impossible, the radio wave emission is stopped and the IC card 3 is temporarily initialized. After returning to the state, the card control unit 1 can capture the IC card 3 by emitting radio waves again, and perform mutual authentication processing, data reading processing, and data writing processing again to generate an error. Card renewal processing can be performed.
<Third Embodiment>
Next, a third embodiment of the present invention will be described.
[0047]
This example is also an example of the case where the IC card 3 leaves after the IC card 3 is once captured and then proceeds to the write command sending process. 6 and 7 are used in the description of this example, the main part of this example is the process I shown in FIG. This will be specifically described below.
[0048]
First, the card update process is started as described above (W1), radio waves are radiated from the antenna 2 (W2), and the user brings the IC card 3 within a certain range to turn on the IC card 3. Thereafter, the card control unit 1 sends a card capture command, executes a card capture process to a data read process (W3 to W12), and further performs a data write process (W13).
[0049]
Here, also in this example, the IC card 3 is separated from the card control unit 1 and no write response is input (f shown in FIG. 6), and also in this example, the write command stops emission of radio waves (see FIG. 6). W18 shown in FIG. Thereafter, radio wave radiation is resumed from the card control unit 1 (W19), and after card capture processing, mutual authentication processing, and data reading processing are performed (W20 to W29), a written determination is made (W30).
[0050]
This determination is based on the write command sent from the card control unit 1 when the IC card 3 leaves as described above, and determines whether or not the IC card 3 has executed the monetary data subtraction process. . Therefore, for example, by confirming the data obtained by the data read response, it can be determined whether or not the subtraction process has already been executed. If the writing process is not yet executed, the writing command is sent again (W30 is NO, W31). With this process, the IC card 3 performs a data write process (W32), rewrites the data, and returns a write response (W33, W34).
[0051]
On the other hand, if the data has been rewritten, it is determined that the subtraction process has been executed based on the previous write command (YES in W30), the radio wave emission is immediately stopped, and the card update process is completed (W35). .
[0052]
As described above, according to this example, after the write command is sent, the IC card 3 moves to a position away from it, and after that, when the process is resumed, the data rewrite is determined before the write command is sent again, If the rewriting process is completed, radio wave emission is immediately stopped, and the card update process is completed.
[0053]
With this configuration, the processing is simplified, the processing speed is improved, and unnecessary power consumption is eliminated.
In the first to third embodiments, the non-contact IC card control method of this example is applied to the system of the vending machine, but it is needless to say that it can be applied to other systems. For example, the present invention can be applied to deposits and withdrawals in ATMs, use of IC cards in automatic ticket gates, and the like.
[0054]
【The invention's effect】
As described above, according to the present invention, it is configured to shift to the mutual authentication process only when the card capturing process is finished within a predetermined time, and the card update process is prevented from being interrupted due to timeout.
[0055]
In addition, if communication with the IC card becomes impossible after sending the write command, the IC card is returned to the initial state by stopping the emission of radio waves, and a non-contact IC card that does not cause a card update error A control method can be provided.
[0056]
Furthermore, if communication with the IC card becomes impossible after sending the write command, it is determined whether to rewrite the data before sending the write command again. If the rewrite process has already been completed, the data rewrite process is performed again. The card update process is speeded up and unnecessary power consumption is prevented.
[Brief description of the drawings]
FIG. 1 is a system diagram illustrating a method for controlling a non-contact IC card.
FIG. 2 is a flowchart for explaining basic processing of data communication performed between a card control unit and an IC card.
FIG. 3 is a list of state transitions (mode transitions) based on input of various commands.
FIG. 4 is a flowchart illustrating the first embodiment.
FIG. 5 is a flowchart illustrating the first embodiment.
FIG. 6 is a flowchart illustrating the second and third embodiments.
FIG. 7 is a flowchart for explaining second and third embodiments.
FIG. 8 is a flowchart for explaining a conventional example.
FIG. 9 is a flowchart illustrating a conventional example.
FIG. 10 is a flowchart illustrating a conventional example.
FIG. 11 is a flowchart illustrating a conventional example.
FIG. 12 is a flowchart for explaining a conventional example.
[Explanation of symbols]
1 Card Control Unit 2 Antenna 3 IC Card 4 Card Update Timer 5 Card Capture Timer

Claims (3)

Power supply processing that emits radio waves and supplies power to a non-contact IC card;
A capturing process for capturing the contactless IC card;
And the authentication process for authenticating a previous Symbol non-contact IC card,
After the authentication, a data read process for reading data in the non-contact IC card;
After the data read, and data write processing of writing data to the non-contact type IC card, a control method for a row Cormorant contactless IC card,
A card update timer in which a time from the power supply process to the data writing process is set;
A card supplement timer in which a time for performing the power supply process to the capture process is set, and
The set time of the card supplement timer is set to a time at which all the processes are completed within the set time of the card update timer after the supplement process, and the supplement process is not completed by the set time of the card supplement timer. When the radio wave emission ends,
A method for controlling a non-contact IC card. If the data communication with the non-contact IC card becomes impossible before the data writing process is completed, a radiation stop process for stopping the emission of the radio wave,
Radio wave radiation processing for restarting radio wave radiation to the non-contact IC card after the radio wave radiation is stopped;
The method for controlling a non-contact IC card according to claim 1, wherein: During the data writing process, after data communication with the non-contact IC card becomes impossible, when data communication with the non-contact IC card becomes possible again, determine whether to perform the data writing process again, 2. The method of controlling a non-contact IC card according to claim 1, wherein when the data in the non-contact IC card has already been rewritten, the data writing process is omitted and the process is terminated.

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