JP5983987B2 - IC card communication method and IC card - Google Patents

Description

  The present invention belongs to the technical field of communication between an IC card and a reader / writer. In particular, the present invention relates to an IC card communication method and an IC card that select and communicate with an appropriate interface according to the communication status in communication between an IC card having a plurality of interfaces and a reader / writer.

A technique related to communication between an IC card having a plurality of interfaces and a reader / writer is known.
For example, regardless of the polling interval on the reader / writer side, communication with the reader / writer is performed using a communication interface of an appropriate communication method. The communication method of the communication interface set as the default and the communication method is determined. If the communication method is the same, the default communication interface (for example, communication method α) is used, and the communication method is If not the same, the communication interface to be used is switched to a communication interface of another communication method (for example, communication method β) (Patent Document 1).
In addition, when any trouble occurs inside the portable information recording medium, for the purpose of identifying the cause, the IC card includes a communication unit having a non-contact communication unit and a contact communication unit, a non-contact communication unit, A CPU that controls the contact communication unit is provided. The CPU performs main communication in the non-contact communication unit, and in the test mode, the communication unit is switched from the non-contact communication unit to the contact communication unit, and the contact is performed. The communication unit notifies the contact external device of the information of the jump destination address as internal processing information (Patent Document 2).
Further, for the purpose of reducing the waiting time of the user, the IC card includes a communication unit having a non-contact communication unit and a contact communication unit, a CPU for controlling the communication unit, and the like. The main communication with the reader / writer is performed in the unit, the communication means is switched from the non-contact communication unit to the contact communication unit while the communication is performed, and the PDA (second external device) is switched with the switched contact communication unit. After communication is completed, the communication means is switched from the contact communication unit to the non-contact communication unit, and a response is made to the non-contact communication unit reader / writer 20a that has switched (Patent Document 3).

JP2006-072786 JP2007-011419 JP2007-034774

By the way, as an interface of an IC card, ISO 7816 (ISO: International Organization for Standardization), USB (Universal Serial Bus), SWP (Single Wire Protocol) are known as communication methods with an external terminal (contact type). As a non-contact type (proximity type) communication method, Type A, Type B, and Type C (Felica (registered trademark)) are known. A dual interface card compatible with both contact type and proximity type communication methods is known.
In the above-described prior art, a configuration using a plurality of interfaces in communication between an IC card and a reader / writer is disclosed. However, a configuration for selecting an interface suitable for the communication status is not disclosed.

  The present invention has been made to solve the above problems. An object of the present invention is to provide an IC card communication method and an IC card which select and use an appropriate interface according to the communication status in communication between an IC card having a plurality of interfaces and a reader / writer. .

The IC card communication method according to claim 1 of the present invention is the communication between an IC card having a plurality of interfaces and a reader / writer serving as a proximity communication means, and the IC card in the plurality of interfaces of the IC card. a communication condition detection step of detecting a communication status with the reader-writer, a communication propriety determination process of performing determination on the appropriateness of the communication status of the plurality of interfaces, the plurality of interfaces that detects the communication status in accordance with the propriety determination And an interface selection process for selecting an interface to be used for communication.
In the IC card communication method according to claim 2 of the present invention, the plurality of interfaces further include contact-type communication means.
An IC card communication method according to claim 3 of the present invention is the IC card communication method according to claim 1 or 2, wherein the communication status is a communication speed and a power supply state.
An IC card communication method according to claim 4 of the present invention is the IC card communication method according to any one of claims 1 to 3, wherein the communication status detection process and the communication suitability determination process are performed by the IC card. The operation of the interface selection process is started when the communication in use is determined to be non-conforming in the suitability determination.
An IC card communication method according to claim 5 of the present invention is the IC card communication method according to any one of claims 1 to 4, further comprising communication setting means for setting suitability determination criteria and connection priority. The communication status detection process stores the detected communication status, the communication suitability determination process stores the communication status suitability determination by comparing the communication status and the suitability determination criteria, and the interface selection process includes the suitability determination and the The interface used for communication is selected based on the connection priority.
An IC card according to claim 6 of the present invention is an IC card having a plurality of interfaces serving as proximity communication means for communicating with a reader / writer, and the IC card and the reader in the plurality of interfaces. a communication condition detection means for detecting the communication status of the writer, a communication appropriateness determination means for performing suitability judgment of the communication status of the plurality of interfaces, the communication from the plurality of interfaces that detects the communication status in accordance with the propriety determination And an interface selection means for selecting an interface to be used.

According to the present invention, in communication between an IC card having a plurality of interfaces serving as proximity communication means and a reader / writer, an appropriate interface is selected according to the communication status between the IC card and the reader / writer. An IC card communication method and an IC card used for the above are provided.

It is a block diagram which shows an example of a structure of the IC card of this invention. It is a figure which shows an example of the data format of the communication condition in the IC card of this invention. It is a figure which shows an example of the data format of the suitability criterion in the IC card of this invention. It is a figure which shows an example of the data format of the suitability determination in the IC card of this invention. It is a figure which shows an example of the data format of the connection priority in the IC card of this invention. It is a flowchart which shows the process of determining the interface used for communication in the IC card of this invention. It is a flowchart which shows the process in which the interface currently used for communication in the IC card of this invention is changed according to a communication state.

Next, embodiments of the present invention will be described with reference to the drawings. An example of the configuration of the IC card of the present invention is shown in FIG. As shown in FIG. 1, the IC card includes an interface unit 1 for performing communication with a reader / writer, a CPU, a coprocessor, and the like, a processing unit 2 for performing signal processing and data processing, and a RAM (Random The storage unit 3 includes an access memory (ROM), a read only memory (ROM), an electrically erasable programmable read-only memory (EEPROM), and the like, and a storage unit 3 that stores data, programs (OS, applications), and the like. In the interface unit 1, 11 is a Type A communication means, 12 is a Type B communication means, 13 is a Type C communication means, 14 is an ISO7816 communication means, 15 is a USB communication means, and 16 is a SWP communication means. As can be seen from this configuration, the IC card in the present invention includes a UICC (Universal Integrated Circuit Card), a SIM card (Subscriber Identity Module Card), a UIM card (User Identity Module Card), and the like. In the example shown in FIG. 1, six communication means are listed for explanation. However, in an actual IC card, not all of these communication means but a plurality of communication means selected from them are provided. Good. In the processing unit 2, 21 is a communication status detecting unit, 22 is a communication suitability determining unit, 23 is an interface selecting unit, and 24 is a communication setting unit. In the storage unit 3, 31 is a communication status, 32 is a suitability determination criterion, 33 is a suitability determination, 34 is a connection priority, 35 is an OS, and 36 is an application.
In the configuration shown in FIG. 1, the configuration according to the present invention is described, and the configuration that is not directly related to the present invention is not described even if the configuration is a general configuration provided in a general IC card.

  The Type A communication means 11 is a proximity type communication means whose communication method is Type A. Since the IC card has the Type A communication unit 11, when the reader / writer performs communication using the Type A communication method, the IC card can perform communication using the Type A communication method with the reader / writer. In Type A, the modulation method from the reader / writer to the IC card is ASK (Amplitude Shift Keying) 100% modulation, and the encoding method is a modified Manchester method. Type A is a method in which a modulation method from an IC card to a reader / writer performs load modulation at a subcarrier frequency (847 KHz), and a coding method is a Manchester method. Since Type A is well known, detailed description thereof is omitted.

  The Type B communication means 12 is a proximity type communication means whose communication method is Type B. Since the IC card has the Type B communication means 12, when the reader / writer performs communication using the Type B communication method, the IC card can perform communication using the Type B communication method with the reader / writer. In Type B, the modulation method from the reader / writer to the IC card is ASK 10% modulation, and the encoding method is an NRZ-L (Non Return to Zero-Level) method. Type B is a method in which a modulation method from an IC card to a reader / writer performs load modulation at a subcarrier frequency (847 KHz), and an encoding method is an NRZ-L method. Since Type B is well known, detailed description thereof is omitted.

  The Type C communication means 13 is a proximity communication means whose communication method is Type C (FeliCa (registered trademark)). Since the IC card has the TypeC communication means 13, when the reader / writer communicates with the TypeC communication method, the IC card can communicate with the reader / writer using the TypeC communication method. In Type C, the modulation method is ASK 10% modulation, and the encoding method is the Manchester method. The data transfer method is half-duplex communication using no subcarrier (carrier frequency is 13.56 MHz), and bidirectional communication between the reader / writer and the IC card is performed by periodically switching the communication direction. Is realized. Since Type C is well known, detailed description thereof is omitted.

  The ISO 7816 communication means 14 is a contact-type communication means whose communication method conforms to ISO (International Organization for Standardization) 7816. Since the IC card has the ISO 7816 communication means 14, when the reader / writer performs communication using the ISO 7816 communication method, the IC card can perform communication using the ISO 7816 communication method with the reader / writer. ISO 7816-2 defines the arrangement, dimensions, and use of contacts (electrical contacts). There are 8 contacts (C1 to C8), of which 6 are specified for use and 2 (C4, C8) are for future use. ISO 7816-3 defines a procedure for transmitting and receiving electrical signals between an IC card and a reader / writer. Since the communication system of ISO7816 is well known, detailed description is omitted.

  The USB communication means 15 (USB: Universal Serial Bus) is a high-speed UICC whose communication method conforms to ISO 7816-12 or is standardized by ETSI-SCP (European Telecommunications Standards Institut-Smart Card Platform) (ETSI TS 102.600). It is a contact-type communication means compliant with the (Universal Integrated Circuit Card) standard (IC_USB; Inter Chip_USB). Since the IC card such as UICC has the USB communication means 15, when the reader / writer communicates with the communication method of ISO7816-12, the IC card (UICC) communicates with the communication method of ISO7816-12 or the high-speed UICC standard. Can be performed with the reader / writer. In the high-speed UICC standard, C4 and C8 contacts of an IC card (UICC) are used. Since the USB communication system is well known, detailed description thereof is omitted.

The SWP communication means 16 is a contact type communication means compliant with SWP (Single Wire Protocol) standardized by ETSI-SCP (ETSI TS 102.613). By having the SWP communication means 16 in the IC card, when the reader / writer communicates with the SWP communication method, the IC card such as UICC can communicate with the reader / writer with the SWP communication method. . In the ETSI-SCP standard, contacts of C6 and C1 of an IC card (UICC) are used.
In addition, for communication between UICC and CLF (Contactless Front End), HCI (Host Controller interFace) that manages communication in an upper layer of SWP is standardized in ETSI-SCP (ETSI TS 102.622). Yes. When the SWP communication means 16 performs this SWP / HCI communication, in a mobile phone, communication device, etc. equipped with an IC card (UICC) and a CLF with a built-in NFC (Near Field Communication) application. Contact type communication can be performed. Since the SWP communication method is well known, a detailed description thereof will be omitted.

The communication status detection means 21 refers to the connection priority 34, and when the priority is determined in the connection priority 34, the communication means (interface) provided in the IC card is activated in order according to the priority. And attempt communication connection with the reader / writer. The communication status detection means 21 detects the communication status with the reader / writer in the communication means provided in the IC card in the communication connection trial, and stores the detected communication status as the communication status 31 in the storage unit 3. Since the communication status is detected in order according to the priority order, the communication status detection means 21 updates the communication status 31 each time the detection is made, and writes the newly detected communication status of the communication means in the communication status 31. By updating the communication status 31 each time it is detected, it becomes possible to select a communication means suitable for communication in a short time.
The communication status detection unit 21 refers to the connection priority 34, and when the priority is not determined in the connection priority 34, the communication status detection unit 21 makes a round for all the communication units included in the IC card. Are activated and operated in any order, and communication connection with the reader / writer is tried. The communication status detection means 21 detects the communication status with the reader / writer in the communication means provided in the IC card in the communication connection trial, and stores the detected communication status as the communication status 31 in the storage unit 3. Since the priority order has not been determined, the communication status detection unit 21 stores all the communication statuses of the communication units included in the IC card in the communication status 31 in a single round. By storing the communication status 31 collectively, it is possible to select the most suitable communication means.

The communication status detected by the communication status detection means 21 includes, for example, whether or not communication connection between the communication means provided in the IC card and the reader / writer is possible, the communication speed when communication connection is possible, and the IC card from the reader / writer. Power supply status to
The communication speed detected by the communication status detection means 21 is a communication speed defined in the communication standard of each communication means, and when there are a plurality of communication speeds, the communication speed used in actual communication may be used. it can. In the communication standard, for Type C, for example, the communication speed is 211 kbps for the first generation and 424 Kbps for the second generation. Further, in the ISO 7816 T = 1 protocol, a communication speed such as 9.6 Kbps, 38.4 Kbps, and 76.8 Kbps can be selected.
In addition, the communication speed detected by the communication status detection unit 21 is not a communication speed used in actual communication, but an average value in time including idle time in intermittent communication, time of retransmission due to noise, and the like. Communication speed. By setting the latter communication speed as the communication status detected by the communication status detection unit 21, a communication status closer to the actual communication status can be detected.

The power supply state detected by the communication status detection means 21 is the state of power received by the IC card from the reader / writer. The power consumption of an IC card is generally maximized when the IC card is activated and starts operating. Therefore, the communication status detection means 21 increases the priority of activation (activation) so that it operates at an early stage when the IC card is activated and starts operating. At least the communication status detection means 21 is activated and starts operation before starting communication. As a result, the communication status detection unit 21 can set the power supply state to be detected to the power (= voltage × current), voltage, or current when the power supply state is almost maximized.
The power supply state detected by the communication status detection means 21 is power (= voltage × current) as an average value for a certain period of time when the IC card is activated and starts operating, or voltage and current are set to the power supply state. Can do.
When the power supply state is bad or when there is no room, the voltage decreases, so that all of the power, voltage, and current decrease. The power supply state at that time is detected by the communication status detection means 21. When the voltage drops below the value required for the IC card to operate, the IC card cannot operate normally, and the communication status detection means 21 also does not operate.

The communication status 31 is tabular data, and the attributes include, for example, a communication means name, communication connection availability, communication speed, and power supply status. The values of these attributes (attribute values) are detected values detected by the communication status detecting means 21. An example of the communication status 31 is shown as a table in FIG. As shown in FIG. 2, there are Type A communication means, Type B communication means, Type C communication means, ISO 7816 communication means, USB communication means, and SWP communication means as attribute values of the communication means name in the communication status 31. It has 1 (possible) and 0 (no) as attribute values, and has ○○ ・ ・ ・ ○ bps (○; number, bps; Bits Per Second) as communication speed attribute values, and attributes of power supply status Values include power W (Watt), voltage V (Volt), and current A (Ampere).
Note that the communication means (interface) provided in the IC card need not be all of the communication means described in the interface unit 1 of FIG. For example, it may be an IC card provided with only three of Type A communication means 11, Type B communication means 12, and ISO 7816 communication means 14.

  The communication suitability determination unit 22 compares the communication status 31 with the suitability determination criterion 32 each time the communication status detection unit 21 detects the communication status and newly stores or updates the communication status as the communication status 31. The communication suitability determination means 22 compares the suitability determination criteria 32 with the communication status 31 for all communication means in which the communication status 31 is described in the communication status 31. Then, it is determined whether all the communication means are suitable for communication, and the determination is stored as the appropriateness determination 33.

  The suitability determination criterion 32 is tabular data, and has an attribute corresponding to the communication status 31 described above. For example, it has a communication means name, communication connection availability, communication speed, and power supply status. The values of these attributes (attribute values) are reference values set by the determination reference setting means 24. An example of the suitability determination criterion 32 is shown as a table in FIG. As shown in FIG. 3, it has Type A communication means, Type B communication means, Type C communication means, ISO 7816 communication means, USB communication means, and SWP communication means as attribute values of the communication means name in the communication status 31. It has 1 (possible) as an attribute value. In addition, the attribute value of communication speed is XX ... ○ bps (○: number, bps: Bits Per Second), and the value is different depending on the communication means, and the communication speed is impossible. Corresponding to the states of good, excellent, etc., a plurality of different values are provided as reference values. Further, the power supply state attribute value includes power W (Watt), voltage V (Volt), and current A (Ampere). The value differs depending on the communication means, and further has a plurality of different values as reference values corresponding to the state where the communication speed is not possible, acceptable, good, excellent, etc.

  The suitability determination 33 is tabular data, and has attributes corresponding to the above-described suitability determination criteria 32 as attributes. For example, it has a communication means name, communication connection availability, communication speed, and power supply status. The values of these attributes (attribute values) are the determination values determined by the communication suitability determination unit 22. An example of the suitability determination 33 is shown as a table in FIG. As shown in FIG. 4, there are Type A communication means, Type B communication means, Type C communication means, ISO 7816 communication means, USB communication means, and SWP communication means as attribute values of the communication means name in the communication status 31. The attribute value has 0 for the determination of disapproval (non-permission) by the communication suitability determination means 22 and 1 for the determination of good. Further, the attribute value of the communication speed has 0 for the determination of failure by the communication suitability determination means 22, 1 for the determination of good, 2 for the determination of good, and 3 for the determination of good. Further, the attribute value of the power supply state has 0 for the determination of failure by the communication suitability determination means 22, 1 for the determination of permission, 2 for the determination of good, and 3 for the determination of good.

  In the above description, whether or not communication connection is possible is set as one of the attributes as the communication status. Whether or not this connection is possible is determined by the communication status detection means 21 detecting whether or not the reader / writer has communication means corresponding to the communication means provided in the IC card. However, whether or not communication connection is possible can be determined based on the communication speed. In other words, when the communication speed is 0 (bps), it can be regarded as having been detected that communication connection is not possible (or not). Therefore, with such a configuration, it is possible to omit the availability of communication connection from the communication status.

The interface selecting unit 23 selects the communication unit (interface) determined to be suitable by the communication suitability determining unit 22 as a communication unit to be used for communication. Based on the suitability determination 33, the interface selection means determines whether or not the match is determined. That is, the communication means described as 1 (possible) in the communication availability in the suitability determination 33 is a communication means determined to be compatible.
When there are a plurality of communication means determined to be suitable, the interface selection means 23 refers to the connection priority 34, and if there is a description giving priority to a specific communication means, the communication means is selected accordingly.
In addition, when there is no description that gives priority to a specific communication means, if there is a description that gives priority to the communication speed, the interface selection means 23 selects the communication means accordingly. For example, when there are communication means having a communication speed of 1 and 3 communication means determined to be compatible, the communication means having a communication speed of 3 is selected as the communication means to be used for communication.
In addition, when there is no description that gives priority to a specific communication means, if there is a description that gives priority to the power supply state, the interface selection means 23 selects the communication means accordingly. For example, when the communication means determined to be compatible includes one with a power supply state of 1 and three, the communication means with a power supply state of 3 is selected as the communication means used for communication.
In addition, when there is no description that gives priority to a specific communication means, when both the description that gives priority to the communication speed and the description that gives priority to the power supply status exist in the connection priority 34, the interface selection means 23 determines that A communication means having a large value obtained by adding the value of the communication speed and the power supply state in the determined communication means is selected.

The connection priority 34 is tabular data, and has, for example, communication means name, connection priority, communication speed, and power supply status as attributes. The values of these attributes (attribute values) are set values set by the communication setting unit 24. An example of the connection priority 34 is shown as a table in FIG. As shown in FIG. 5, there are Type A communication means, Type B communication means, Type C communication means, ISO 7816 communication means, USB communication means, and SWP communication means as attribute values of communication means names in the communication status 31. In addition, 0, 1, 2, 3,... 0 indicates that no connection priority is assigned, and 1, 2, 3,... Indicate that priority is assigned in the numerical order. In addition, 0 and 1 are included as attribute values of the communication speed. 0 indicates that communication speed is not prioritized, and 1 indicates that communication speed is prioritized. Moreover, it has 0 and 1 as an attribute value of a power supply state. 0 indicates that the power supply state is not prioritized, and 1 indicates that the power supply state is prioritized.
When the priority is 0 for all communication means in the connection priority 34, the communication status detection means 21 refers to the connection priority 34, and the communication when the priority is determined in the connection priority 34. Performs situation detection operations. Further, when the priority is not 0 even for one communication means in the connection priority 34, the communication status detecting means 21 refers to the connection priority 34, and when the priority is not determined in the connection priority 34. A communication status detection operation is performed (see the description of the communication status detection means 21 described above).

The communication setting unit 24 sets the suitability determination standard 32 and the connection priority 34. The communication setting unit 24 is operated by a program (software) such as an OS (Operating System) 35 and an application 36. Therefore, in a specific mode in the operation of the IC card, the communication setting means 24 is activated and operates, and new setting and update setting can be performed. Therefore, when the application is activated (activated), it can be updated to a setting suitable for the application. In addition, when the application is activated (activated), the suitability determination criterion 32 and the connection priority 34 that are set in advance can be used so as to suit the application. For example, when an application performs a large amount of data communication, the communication speed can be set as a priority.
Needless to say, not only the communication setting unit 24 but also the interface unit 1, the processing unit 2, and the storage unit 3 include programs such as an OS (Operating System) 35, an application 36, firmware, and the like ( Software).

The configuration has been described above. Next, the operation of the present invention will be described. FIG. 6 shows a process for determining an interface used for communication in the IC card of the present invention as a flowchart.
First, in step S101 of FIG. 6 (refer to connection priority), the communication status detection unit 21 refers to the connection priority 34.
Next, in step S102 (number of target interfaces = K), the communication status detection unit 21 reads the number of interfaces set with the priority level existing in the communication unit name of the connection priority level 34 and substitutes it for K. Further, when the priority order is not set, the communication status detecting means 21 reads the total number of interfaces existing in the communication means name of the connection priority order 34 and substitutes it for K.
Next, in step S103 (N = 1), the communication status detection unit 21 substitutes 1 for N.
Next, in step S104 (having priority?), The communication status detecting means 21 proceeds to step S105 when the priority is present, and proceeds to step S113 when there is no priority.

Next, in step S105 (Nth priority interface trial), the communication status detection means 21 activates and operates the Nth priority interface (communication means) to try communication connection with the reader / writer. The Nth priority interface is the Nth priority interface.
Next, in step S106 (communication status detection), the communication status detection means 21 detects the communication status.
Next, in step S107 (stored as the Nth communication status), the communication status detection means 21 stores the detected communication status in the storage unit 3 as the communication status 31.
Next, in step S108 (determining whether the Nth communication status is appropriate), the communication suitability determining means 22 compares the suitability determination criterion 32 with the communication status 31. Then, the reliability determination means 22 determines whether or not the Nth priority interface is suitable for communication, and stores the determination as 0 (impossible) or 1 (possible) in the communication determination of the appropriateness determination 33.
Next, in step S109 (compliance?), When the communication suitability determination unit 22 determines that the Nth priority interface is suitable for communication, the process proceeds to step S112, and when it is determined that the Nth priority interface is not suitable for communication. Proceed to step S110.

Next, in step S110 (N = N + 1), the communication suitability determination unit 22 substitutes N + 1 for N (adds 1 to N).
Next, in step S111 (N> K), the communication suitability determination means 22 compares N and K. When N> K, the process proceeds to step S112, and when N> K is not satisfied, the process returns to step S105 to perform the above-described steps. Repeat steps.
Next, in step S112 (interface selection), the interface selection unit 23 selects an interface (communication unit) described as 1 (possible) in communication propriety of the suitability determination 33 as a communication unit used for communication. Note that the interface selection means 23 does not select the communication means used for communication when there is no interface (communication means) described as 1 (possible) in the adequacy determination 33. At that time, the IC card repeats the process of determining the communication use interface from the beginning.

On the other hand, in step S104 (having priority?), If there is no priority, the process proceeds to step S113.
Next, in step S113 (Nth interface trial), the communication status detection means 21 activates and operates the Nth interface (communication means) and tries communication connection with the reader / writer. The Nth interface is the Nth interface in which the communication status detecting means 21 detects the communication status, and the same interface is not duplicated.
Next, in step S114 (communication status detection), the communication status detection means 21 detects the communication status.
Next, in step S115 (stored as the Nth communication state), the communication status detection means 21 stores the detected communication status in the storage unit 3 as the communication status 31.
Next, in step S116 (N = N + 1), the communication status detecting means 21 substitutes N + 1 for N (adds 1 to N).
Next, in step S117 (N> K), the communication status detecting means 21 compares N and K. If N> K, the process proceeds to step S118, and if N> K, the process returns to step S113 and the above-described steps are performed. Repeat steps.

Next, in step S118 (determination of first to K communication suitability), the communication suitability determination means 22 compares the suitability determination criterion 32 with the communication status 31. The communication suitability determination unit 22 compares the suitability determination criterion 32 with the communication status 31 for all communication units in which the communication status 31 includes a description of the communication status (first to K communication statuses). Then, it is determined whether all the communication means are suitable for communication, and the determination is stored as the appropriateness determination 33.
Next, in step S112 (interface selection), the interface selection unit 23 selects an interface (communication unit) described as 1 (possible) in communication propriety of the suitability determination 33 as a communication unit used for communication. When there are a plurality of interfaces described as 1 (possible) in communication availability, the interface selection means 23 refers to the connection priority 34, and if there is a description giving priority to the communication speed, the interface selection means 23 communicates accordingly. Select means. Further, if there is a description giving priority to the power supply state, the interface selecting unit 23 selects the communication unit accordingly. When the connection priority 34 includes both a description giving priority to the communication speed and a description giving priority to the power supply state, the interface selection means 23 adds the value of the communication speed and the power supply state in the communication means determined to be compatible. A communication means with a large value is selected. Note that the interface selection means 23 does not select the communication means used for communication when there is no interface (communication means) described as 1 (possible) in the adequacy determination 33. At that time, the IC card repeats the process of determining the communication use interface from the beginning.

The process of determining the interface has been described above. Next, a process of changing the interface in use according to the communication state will be described. FIG. 7 is a flowchart showing a process of changing the interface used for communication in the IC card of the present invention according to the communication state.
First, in step S201 (driving the Nth interface) in FIG. 7, the Nth interface or the Nth priority interface selected in the process of determining the interface is driven and used for communication. Here, the Nth interface includes the case where it is read as the Nth priority interface.
Next, in step S202 (communication status detection), the communication status detection means 21 detects the communication status.
Next, in step S203 (stored as the Nth communication status), the communication status detecting means 21 stores the detected communication status in the storage unit 3 as the communication status 31.
Next, in step S204 (determining whether the Nth communication status is appropriate), the communication suitability determining unit 22 compares the suitability determination criterion 32 with the communication status 31. Then, the reliability determination means 22 determines whether or not the Nth interface is suitable for communication, and stores the determination as 0 (impossible) or 1 (possible) in the communication propriety determination 33.

Next, in step S205 (applicable?), When the communication suitability determining unit 22 determines that the Nth priority interface is compatible with communication, the process returns to step S201 and the above-described steps are repeated. If it is determined that the Nth priority interface is not suitable for communication, the process proceeds to step S206. The communication suitability determination unit 22 updates the suitability determination 33 every time the suitability determination is performed.
Next, in step S206 (interface selection?), The interface selection unit 23 determines whether or not there is an interface (communication unit) described as 1 (possible) in the suitability determination 33.
Next, in step S207 (whether there is a conformity?), The interface selection means 23 proceeds to step S208 when there is an interface (communication means) described as 1 (possible) in the communication feasibility in the suitability determination 33, and does not exist. Sometimes, the process proceeds to the “communication use interface determination” processing routine.
Next, in step S208 (update N to the selected N), the interface selection unit 23 is a communication unit that uses the interface (communication unit) described as 1 (possible) in the adequacy determination 33 for communication. select. When there are a plurality of interfaces described as 1 (possible) in communication availability, the interface selection means 23 refers to the connection priority 34, and if there is a description giving priority to the communication speed, the interface selection means 23 communicates accordingly. Select means. Further, if there is a description giving priority to the power supply state, the interface selecting unit 23 selects the communication unit accordingly. When the connection priority 34 includes both a description giving priority to the communication speed and a description giving priority to the power supply state, the interface selection means 23 adds the value of the communication speed and the power supply state in the communication means determined to be compatible. A communication means with a large value is selected. Then, N is updated to N of the selected communication means. Note that N is a number that identifies the communication means, and is a number that matches the priority when priority is set. Note that the interface selection means 23 does not select the communication means used for communication when there is no interface (communication means) described as 1 (possible) in the adequacy determination 33. At that time, the IC card repeats the process of determining the communication use interface from the beginning.

  It can be used in an IC card having a plurality of interfaces.

DESCRIPTION OF SYMBOLS 1 Interface part 11 TypeA communication means 12 TypeB communication means 13 TypeC communication means 14 ISO7816 communication means 15 USB communication means 16 SWP communication means 2 Processing part 2
DESCRIPTION OF SYMBOLS 21 Communication condition detection means 22 Communication suitability determination means 23 Interface selection means 24 Communication setting means 3 Storage part 31 Communication condition 32 Suitability determination criteria 33 Suitability determination 34 Connection priority 35 OS
36 applications

Claims (6)

In communication between an IC card having a plurality of interfaces serving as a proximity communication means and a reader / writer,
A communication status detection process for detecting a communication status between the IC card and the reader / writer at a plurality of interfaces of the IC card ;
A communication adequacy determination process for determining adequacy of the communication status in the plurality of interfaces ;
In accordance with the suitability determination , an interface selection process for selecting an interface to be used for communication from the plurality of interfaces that have detected the communication status ;
An IC card communication method comprising:   2. The IC card communication method according to claim 1, wherein the plurality of interfaces further include contact-type communication means.   3. The IC card communication method according to claim 1, wherein the communication status is a communication speed and a power supply state.   The IC card communication method according to any one of claims 1 to 3, wherein the communication status detection process and the communication suitability determination process continue to operate while the IC card is communicating, and are being used for the suitability determination. An IC card communication method, wherein when the communication is determined to be incompatible, the interface selection process starts operation.   5. The IC card communication method according to claim 1, further comprising communication setting means for setting suitability determination criteria and connection priority, wherein the communication status detection process stores the detected communication status, and the communication The suitability determination process stores the communication status suitability judgment by comparing the communication status and the suitability judgment criteria, and the interface selection process selects an interface to be used for communication based on the suitability judgment and the connection priority. An IC card communication method characterized by the above. In an IC card having a plurality of interfaces serving as a proximity communication means for communicating with a reader / writer,
Communication status detection means for detecting a communication status between the IC card and the reader / writer in the plurality of interfaces;
Communication suitability judging means for judging suitability of the communication status in the plurality of interfaces ;
Interface selection means for selecting an interface to be used for communication from the plurality of interfaces that have detected the communication status according to the suitability determination;
An IC card characterized by comprising:

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