JP2012003547A - Portable electronic device, communication system and communication method used for portable electronic device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a portable electronic device, a communication system and a communication method used for the portable electronic device which can efficiently perform communication.SOLUTION: A portable electronic device which communicates with an external device comprises: communication means; setting means; and changing means. The communication means transmits and receives data in frame units. The setting means sets a initial value of maximum frame number which can be successively transmitted and received by the communication means. When a frame received by the communication means from the external device includes parameters which indicates the maximum frame number, the changing means changes the maximum frame number set by the setting means based on the parameters.

Description

  Embodiments described herein relate generally to a portable electronic device such as an IC card, a communication system, and a communication method used for the portable electronic device.

  A portable electronic device such as an IC card performs various processes by performing data communication with a terminal device. Some communication methods between portable electronic devices and terminal devices transmit and receive data divided into frame units. In a communication method for transmitting and receiving data in frame units, the maximum number of frames that can be transmitted and received at a time is set first, and data is transmitted and received in frames within the maximum number of frames. However, when the maximum number of frames that can be transmitted and received at a time is fixed, efficient communication according to the size of data that is actually transmitted and received may be difficult.

ETSI TS102613 (v7.6.0)

  An object of one embodiment of the present invention is to provide a portable electronic device, a communication system, and a communication method used for the portable electronic device that can efficiently communicate.

  A portable electronic device according to one aspect of the present invention communicates with an external device and includes a communication unit, a setting unit, and a changing unit. The communication means transmits and receives data in units of frames. The setting means sets an initial value of the maximum number of frames that can be continuously transmitted and received by the communication means. The changing means changes the maximum number of frames set by the setting means based on the parameter when the frame received from the external device by the communication means includes a parameter indicating the maximum number of frames.

FIG. 1 is a block diagram illustrating a configuration example of an IC card and an IC card system. FIG. 2 is a block diagram illustrating a configuration example of a mobile phone as an example of a terminal device. FIG. 3 is a diagram illustrating an example of a frame transmitted and received between the IC card and the terminal device. FIG. 4 is a sequence diagram illustrating an example of a communication procedure between the IC card and the terminal device. FIG. 5 is a flowchart for explaining the flow of communication processing in the IC card.

Hereinafter, embodiments will be described in detail with reference to the drawings.
FIG. 1 is a block diagram showing a configuration example of an IC card system having an IC card 1 as a portable electronic device and a terminal device 2.
The IC card system shown in FIG. 1 is a communication system in which an IC card 1 and a terminal device 2 transmit and receive data bidirectionally. For example, the IC card system is assumed to have an operation mode in which the IC card 1 is mounted on a mobile phone as the terminal device 2. In such an operation mode, the IC card 1 and the terminal device 2 perform data communication in a state where the IC card 1 is attached to the terminal device 2. The communication method between the IC card 1 and the terminal device 2 is full duplex communication such as SWP communication.

  The IC card 1 operates by supplying power from the terminal device 2. For example, the IC card 1 is a contact-type portable electronic device (contact IC card) that communicates with the terminal device 2 in physical and electrical contact. However, the IC card 1 may be a non-contact portable electronic device (non-contact IC card) that performs wireless communication in a non-contact state with the terminal device 2 using an antenna or a wireless communication unit. Furthermore, the IC card 1 may be a composite IC card (dual interface IC card) having a communication function as a non-contact IC card and a communication function as a contact IC card.

As shown in FIG. 1, the IC card 1 includes a control unit (CPU) 11, a program memory 12, a working memory 13, a data memory 14, a communication control unit 15, a power supply unit 16, an interface 17, and the like.
The IC card 1 is composed of a card-shaped main body C. One (or a plurality) of IC chips 1 a and an interface 17 are embedded in the card-like main body C forming the IC card 1. The IC chip 1a includes a control unit (CPU) 11, a program memory 12, a working memory 13, a data memory 14, a communication control unit 15, a power supply unit 16, and the like. The IC chip 1a is modularized while being connected to the interface 17, and is embedded in a card-like main body C that forms the IC card 1.

  The control unit 11 controls the entire IC card 1. The control unit 11 includes a processor such as a CPU. The control unit 11 operates based on a control program and control data stored in the program memory 12 or the data memory 14. For example, the control unit 11 executes a process according to a command given from the terminal device 2 by executing a control program that controls the operation stored in the program memory 12. The control unit 11 includes a timer 11a that measures time. For example, the timer 11a measures the transmission timing of response data.

  The program memory 12 is constituted by a read-only memory (ROM: read-only memory). The program memory 12 stores a control program, control data, and the like that control operations according to the specifications of the IC card 1.

  The working memory 13 is composed of a volatile memory (RAM; random access memory). The working memory 13 functions as a buffer memory for temporarily storing data. For example, the working memory 13 can be used as a communication buffer that temporarily stores data to be transmitted and received in communication processing with the terminal device 2. The working memory 13 is also used as a memory for temporarily holding various write data.

  The data memory (nonvolatile memory) 14 is a nonvolatile memory capable of writing data. The data memory 14 is composed of, for example, an EEPROM or a flash memory. In the data memory 14, various information (application program, operation data, etc.) according to the purpose of use of the IC card 1 is written. When the IC card 1 is used for a plurality of usage purposes, the data memory 14 stores a plurality of applications corresponding to the usage purposes.

  The communication control unit 15 controls data communication with the terminal device 2 via the interface 17. When the IC card 1 is a contact IC card, the communication control unit 15 transmits and receives data via the interface 17 as a contact unit that physically and electrically contacts the terminal device 2. In the case of a non-contact type IC card, the communication control unit 15 modulates or demodulates data to be transmitted / received by an antenna as the interface 17.

  The power supply unit 16 supplies power and clock pulses for operating each unit of the IC card 1. For example, when the IC card 1 is a contact type IC card, the power supply unit 16 supplies power and clock pulses directly supplied from an external device via the interface 17 to each unit. When the IC card is a non-contact type IC card, the power supply unit 16 generates power and clock pulses from the radio wave received by the antenna as the interface 17 and supplies the power and clock pulses to each unit in the IC card. .

  The working memory 13 stores setting data such as communication settings set in the communication establishment process. For example, the working memory 13 includes a first setting storage unit 13a, a second setting storage unit 13b, and a third setting storage unit 13c. The first setting storage unit 13a stores a set value of a maximum number of continuous transmission frames (hereinafter also referred to as a maximum frame number (Sliding Window size)). The second setting storage unit 13b stores a setting value indicating whether or not the change of the maximum number of frames is permitted. The third setting storage unit 13c stores a communication speed setting value. Note that the first, second, and third setting storage units 13 a, 13 b, and 13 c may be provided in the data memory 14.

Next, the configuration of the terminal device 2 will be described.
The terminal device 2 supplies power for operating the IC card 1 and performs data communication with the IC card 1. Here, it is assumed that the terminal device 2 is a mobile phone. The mobile phone as the terminal device 2 is assumed to have an operation mode in which communication as a mobile phone can be used with the IC card 1 possessed by each user attached. The IC card 1 is mounted in an IC card socket provided in a mobile phone as the terminal device 2. In a state where the IC card socket of the mobile phone is mounted, the contact portion as an interface of the mobile phone and the interface of the IC card 1 come into contact with each other, thereby enabling data communication. The cellular phone 2 supplies power and clock pulses for operation to the IC card 1 through a contact portion that is in physical contact with the IC card 1.

FIG. 2 is a block diagram illustrating a configuration example of a mobile phone as an example of the terminal device 2.
In the configuration example shown in FIG. 2, the mobile phone 2 includes a control unit 31, a RAM 32, a ROM 33, a nonvolatile memory 34, an IC card interface (first interface) 35, a memory card interface (second interface) 36, An antenna 37, a communication unit 38, an audio unit 39, a vibration unit 40, a display unit 41, an operation unit 42, a power supply unit 43, and the like are included.

  The control unit 31 controls the entire mobile phone 2. The control unit 31 includes a CPU, an internal memory, various interfaces, and the like. The control unit 31 has, as its basic functions, a display control function for controlling the display of the display unit 41, a PLL (Phase Locked Loop) circuit, a data stream path switching, a DMA (Direct Memory Access) controller, an interrupt controller, It has functions such as timer, UART (Universal Asynchronous Receiver Transmitter), secrecy, HDLC (High-level Data Link Control procedure) framing, device controller, and the like.

  The RAM 32 is a volatile memory for storing work data. The RAM 32 is a first setting storage unit 13a that stores a setting value of the maximum number of frames as communication setting information with the IC card 1, and a second setting storage that indicates whether or not the change of the maximum number of frames is permitted. Unit 13b and a third setting storage unit 13c that stores the setting value of the communication speed. The communication setting information with the IC card 1 may be stored in a rewritable memory, for example, a non-volatile memory.

  The ROM 33 is a non-volatile memory that stores control programs, control data, and the like. The ROM 33 is a nonvolatile memory. For example, the ROM 33 stores a control program and control data for performing basic control of the mobile phone 2 in advance. The control unit 31 realizes basic control of the mobile phone 2 by executing a control program stored in the ROM 33.

  The nonvolatile memory 34 is a rewritable nonvolatile memory that stores various data. The nonvolatile memory 34 stores various application programs (applications), control data, user data, and the like. The control unit 31 implements various functions by executing application programs stored in the nonvolatile memory 34.

  The first interface 35 is an interface to which the IC card 1 is attached. The first interface 35 is connected to the control unit 31. Thus, the control unit 31 can perform data communication with the IC card 1 via the first interface 35. The second interface 36 is an interface to which the memory card M can be attached and detached. The second interface 36 is connected to the control unit 31. The control unit 31 can access (write or read data) the memory card M attached to the second interface 36.

  The communication unit 38 transmits and receives telephone call data or data communication data via radio waves via the communication antenna 37. The audio unit 39 has an analog front end unit and an audio unit, and inputs and outputs audio. The vibration unit 40 is configured by a vibration mechanism that vibrates the entire mobile phone 2. The display unit 41 is controlled by the control unit 31 to turn on / off the display and display contents. The operation unit 42 is configured by a keyboard or the like, and an operation instruction from the user is input. The power supply unit 43 is configured by a battery or the like, and supplies power to each unit in the mobile phone 2. The power supply unit 43 also has a function of supplying power to the IC card 1 connected via the first interface 35 and the memory card M connected via the second interface 36.

Next, communication between the IC card 1 and the terminal device 2 will be described.
In the IC card system of the present embodiment, the IC card 1 and the terminal device 2 perform full duplex communication such as SWP communication. In this system, the format of data to be transmitted is determined in advance. The IC card 1 and the terminal device 2 transmit data in units of frames. The amount of transmission data per frame is a prescribed size, and data to be transmitted / received is transmitted / received divided into frame units. Further, in the procedure of transmitting and receiving data (information transmission), setting of the maximum number of continuous transmission frames (hereinafter also referred to as “Sliding Window size (WS))”, continuous transmission of frames, and acknowledgment of reception (or the next frame) Send request).

  First, the terminal device 2 and the IC card 1 set initial values for communication settings by communication establishment processing. In the communication establishment process, the terminal device 2 transmits a reset request to the IC card 1, and the IC card 1 returns setting data to the terminal device 2. In the reset request, the terminal device 2 designates the WS value, the timeout time of the reception confirmation response, and the like for the IC card 1 with parameters. The time-out time is set to a length corresponding to the WS value.

  For example, “2”, “3”, or “4” can be set as the value of the sliding window size (WS). In this case, the default setting value of the WS value may be “4” and can be changed to “2” or “3”. The timeout time is a time corresponding to the WS value. For example, the timeout time may be (default value (for example, 5 ms)) × (WS value) / (default setting value of the WS value (for example, “4”)). In this case, the timeout value is 5 ms × 4/4 = 5 ms for the WS value “4”, the timeout time is 5 ms × 3/4 = 3.75 ms for the WS value “3”, and the WS value “2”. ”Is 5 ms × 2/4 = 2.5 ms.

  As described above, the time-out period is set according to the WS value, and becomes longer as the WS value is larger. Therefore, the timing for outputting a response such as a reception confirmation is the time-out period set according to the WS value even when the number of frames to be actually transmitted is smaller than the set WS value. As a result, when the number of frames to be actually transmitted is smaller than the set WS value, an extra waiting time occurs.

  On the other hand, when the number of frames to be transmitted is larger than the set WS value (when the data to be transmitted does not fit in the WS value frame), the data is transmitted by dividing the frame for each WS value into a plurality of times. Need arises. In such a case, a response response such as a reception confirmation or a next frame transmission request is generated for each transmission of the WS value, so that the communication procedure is complicated and inefficient.

  In the IC card system of the present embodiment, the WS value can be changed according to the number of frames to be actually transmitted during the communication process as well as the communication establishment process (that is, at the time of reset). In the IC card system of this embodiment, whether to change the WS value during communication can be set in the communication establishment process. For example, in the communication establishment process, the terminal device 2 specifies whether to allow or prohibit the change of the WS value during communication with the IC card 1 together with the reset request. Thereby, the IC card 1 sets whether to allow or prohibit the change of the WS value according to the designation from the terminal device 2.

Next, an example of communication between the IC card 1 and the terminal device 2 will be described.
FIG. 3 is a diagram illustrating an example of communication between the IC card 1 and the terminal device 2. FIG. 4 is a sequence diagram showing a communication procedure between the terminal device 2 and the IC card 1 shown in FIG.
First, the terminal device 2 and the IC card 1 set initial values for communication settings by communication establishment processing. In the communication establishment process, the terminal device 2 determines a sliding window size (WS) and sets a WS value and a timeout time. In the example illustrated in FIG. 3, the terminal device 2 stores “4” as the initial value of the WS value in the first setting storage unit 32 a in the communication establishment process. The terminal device 2 may also store a timeout time (first timeout time) corresponding to the WS value “4” in the first setting storage unit 32a. When the initial value of the WS value is set, the terminal device 2 transmits to the IC card 1 an RSET frame (U-Frame) RS as a reset request (RSET) that specifies the initial value “4” of the WS value as a parameter. In the reset request, whether or not the WS value can be changed or the initial value of the communication speed may be specified. Here, the setting of the WS value will be described.

  In the communication establishment process, the IC card 1 receives a reset request from the terminal device 2. When receiving the reset request, the IC card 1 stores the initial value of the WS value in the first setting storage unit 13a based on the WS value specified by the parameter included in the reset request. When the initial value of the WS value is designated as “4”, the IC card 1 stores “4” as the initial value of the WS value in the first setting storage unit 13a. In this case, the IC card 1 may also store the timeout time (first timeout time) corresponding to the WS value “4” in the first setting storage unit 13a. When the initial value of the WS value is set based on the reset request from the terminal device 2, the IC card 1 transmits a UA frame (U-Frame) UA1 as response data including the set WS value to the terminal device 2. .

  When the communication establishment process is completed, the terminal device 2 and the IC card 1 can transmit and receive actual data such as command data and response data. In the example illustrated in FIG. 3, first, the terminal device 2 converts data including four frames (I0.0, I1.0, I2.0, and I3.0) into an I frame (I-Frame) I1 having four frames. To the IC card 1. In the example shown in FIG. 3, since the WS is set to the initial value “4” immediately after the communication establishment process, the terminal device 2 continuously transmits four frames of data.

  The IC card 1 sequentially receives four frames (I0.0, I1.0, I2.0, I3.0) transmitted from the terminal device 2. While receiving these frames, the IC card 1 receives the first frame (I0.0) in the I frame I1 and then receives the first value corresponding to the WS value setting value (here, the initial value “4”). When the timeout time elapses, an S frame (S-Frame) RR1 as reception confirmation is transmitted to the terminal device 2. When the WS value is set to “4”, the IC card 1 determines that the first timeout time as the timeout time corresponding to the WS value “4” from the end of the first frame (I0.0) in the I frame I1. When the time has elapsed, an S frame RR1 for confirmation of reception is transmitted to the terminal device 2.

  When there are three frames of data to be transmitted following the four frames (I0.0, I1.0, I2.0, I3.0), the terminal device 2 stores the data in the first setting storage unit 32a. The WS value to be changed is changed from “4” to “3”. In this case, the terminal device 2 transmits a U frame (U-Frame) UA2 as a command for designating changing the WS value from “4” to “3” to the IC card 1. The U frame (U-Frame) UA2 is a frame including the parameter indicated by the WS value “3”. When the terminal device 2 transmits a command designating the change of the WS value, the terminal device 2 receives three frames (I4.0, I5.0, I6.0) without receiving confirmation (response) from the IC card 1 with respect to the U frame UA2. ) Is transmitted to the IC card 1.

  When receiving the U frame UA2 designating the change of the WS value from the terminal device 2, the IC card 1 changes the WS value stored in the first setting storage unit 13a to the value “3” designated by the parameter. . Further, the timeout time is also changed to a timeout time corresponding to the WS value “3” (hereinafter referred to as a second timeout time). In this case, the IC card 1 does not transmit a reception confirmation (response) to the U frame UA2 designating the change of the WS value, and receives the data of the I frame I2 following the U frame UA2. When the I frame I2 is a command that requires a response by response data, the IC card 1 transmits response data as a processing result for the command of the I frame I2 to the terminal device 2.

  However, if the processing result (response data) for the command of the I frame I2 is not obtained when the second timeout time has elapsed from the end of the first frame (I4.0) in the I frame I2 (processing for the received command) When the time is later than the timeout time), the IC card 1 transmits a reception confirmation before transmitting the response data. That is, when the processing result (response data) for the command is obtained before the second timeout time elapses from the end of the first frame (I4.0) in the I frame I2 (the processing time for the command is shorter than the timeout time). If it is early, the IC card 1 transmits the response data without transmitting the reception confirmation.

  In the example shown in FIG. 3, the response data for the command data of the I frame I2 is data for four frames. Therefore, the IC card 1 changes the WS value stored in the first setting storage unit 13a from “3” to “4”. In this case, the IC card 1 transmits a U frame (U-Frame) UA3 as a command for designating changing the WS value from “4” to “3” to the terminal device 2. The U frame (U-Frame) UA3 is a frame including a parameter indicating the WS value “4”. When a command designating the change of the WS value is transmitted, the IC card 1 waits for confirmation of reception of the command from the terminal device 2 without waiting for four frames (I0.7, I1.7, I2.7, I3. 7) is transmitted to the terminal device 2 as an I-frame I3.

  The terminal device 2 sequentially receives the U frame UA3 transmitted from the IC card 1 and the I frame I3 including the following four frames (I0.7, I1.7, I2.7, I3.7). The terminal device 2 changes the WS value stored in the first setting storage unit 32a to “4” based on the WS value parameter included in the U frame UA3. The terminal device 2 also changes the timeout time to the first timeout time corresponding to the WS value “4”. Further, the terminal device 2 sends an S frame (S-Frame) RR2 as an acknowledgment to the IC card when the first time-out period elapses after receiving the first frame (I0.7) in the I frame I3. Send to 1.

  Subsequently, when the terminal device 2 transmits data for two frames, the terminal device 2 changes the WS value stored in the first setting storage unit 32a from “4” to “2”. In this case, the terminal device 2 transmits a U frame (U-Frame) UA4 as a command for designating changing the WS value from “4” to “2” to the IC card 1. The U frame (U-Frame) UA4 is a frame including a parameter indicating the WS value “2”. When the U frame UA4 designating the change of the WS value is transmitted, the terminal device 2 does not wait for reception confirmation (response) from the IC card 1 to the U frame UA4, and the two frames (I7.4, I8.4). ) Is transmitted to the IC card 1 as an I-frame I4.

  The IC card 1 sequentially receives a U frame UA4 transmitted from the terminal device 2 and an I frame I4 composed of the following two frames (I7.4, I8.4). The IC card 1 changes the WS value stored in the first setting storage unit 13a to “2” based on the WS value parameter included in the U frame UA4. The IC card 1 also changes the timeout time to a timeout time corresponding to the WS value “2” (hereinafter referred to as a third timeout time). When the WS value is changed to “2”, the IC card 1 receives the S frame (S) as the reception confirmation when the third time-out period has elapsed after receiving the first frame (I7.4) in the I frame I4. -Frame) RR3 is transmitted to the terminal device 2.

According to the communication procedure described above, the WS value can be changed from the transmission side device (IC card or terminal device) not only in the communication establishment process but also during the communication. For this reason, the device on the transmission side can change the WS value according to the number of frames actually transmitted without performing the communication establishment process again, thereby shortening the communication time and improving the communication efficiency. It becomes possible to do.
In the communication between the terminal device 2 and the IC card 1, the communication speed may be changed during the communication as in the WS value. For example, if a parameter for designating the communication speed in the U frame is determined, the communication speed can be changed by the parameter included in the U frame from the transmission side device.

Next, processing in the IC card 1 or the terminal device 2 for performing communication according to the communication procedure as described above will be described.
FIG. 5 is a flowchart for explaining the flow of communication processing in the IC card 1. For example, the mobile phone as the terminal device 2 performs communication establishment processing with the IC card 1 mounted when the power is turned on or restarted. When performing communication establishment processing, the terminal device 2 transmits a reset request for requesting initial setting of communication to the IC card 1. The reset request includes a parameter indicating the initial value of the WS value, a parameter indicating whether or not the change of the WS value during communication is permitted, a parameter indicating the initial value of the communication speed, and the like.

  Further, the terminal device 2 sets the initial value of the WS value, the information indicating whether or not the change of the WS value is permitted, and the initial value of the communication speed to the first, second, and third setting storage units 32a and 32b, respectively. , 32c is stored (set). It should be noted that the reset request may include a parameter indicating whether or not the change of the communication speed is permitted. In this case, the second setting storage unit 32b stores information indicating whether or not the change of the communication speed is permitted.

  The IC card 1 is activated by supplying power supplied from the terminal device 2 via the interface 17 from the power supply unit 16 to each unit. When activated by the power supplied from the terminal device 2, the IC card 1 performs a communication establishment process for communicating with the terminal device 2. In the communication establishment process, the IC card 1 receives a reset request from the terminal device 2 through the interface 17 and the communication control unit 15 (step S11). When receiving the reset request, the control unit 11 of the IC card 1 performs communication initial setting based on various parameters included in the reset request (step S12).

For example, the control unit 11 of the IC card 1 sets (stores) the initial value of the WS value in the first setting storage unit 13a based on the parameter indicating the initial value of the WS value included in the reset request. Further, the control unit 11 of the IC card 1 stores information indicating whether or not the WS value can be changed in the second setting storage unit 13b based on a parameter indicating whether or not the WS value change during communication is permitted ( Set). Further, the control unit 11 of the IC card 1 stores (sets) the initial value of the communication speed in the third setting storage unit 13c based on the parameter indicating the initial value of the communication speed.
When the communication initial setting based on the parameter included in the reset request is performed, the control unit 11 of the IC card 1 transmits a U frame indicating the setting result to the terminal device 2 (step S13). When the setting result for the reset request is normally transmitted, communication between the IC card 1 and the terminal device 2 is established.

  When communication between the IC card 1 and the terminal device 2 is established, the control unit 11 of the IC card 1 determines whether or not data is received from the terminal device 2 (step S21). If no data is received from the terminal device 2 (step S21, NO), the control unit 11 of the IC card 1 determines whether there is transmission data (step S22). That is, when communication between the IC card 1 and the terminal device 2 is established, the control unit 11 of the IC card 1 enters a standby state for receiving data or transmission data (a state in which data can be transmitted and received).

  When a frame as transmission data from the terminal device 2 is received (step S21, YES), the control unit 11 of the IC card 1 includes a U frame in which the received data includes a parameter for specifying a WS value (WS value parameter). Is determined (step S23). When the received data is a U frame including a WS value parameter (step S23, YES), the control unit 11 of the IC card 1 determines the WS value based on the setting information stored in the second setting storage unit 13b. It is determined whether or not the change is permitted (step S24).

  When it is determined that the change of the WS value is permitted (step S24, YES), the control unit 11 of the IC card stores the first setting storage unit 13a according to the WS value parameter specified in the received U frame. The setting of the current WS value is changed (step S25). When the setting of the WS value is changed, or when the change of the WS value is not permitted (step S24, NO), the control unit 11 of the IC card enters a waiting state for the next data transmission / reception.

  Note that the control unit 11 of the IC card 1 can also change the communication speed by a parameter designated from the terminal device 2. That is, when the data received from the terminal device 2 is a U frame including a parameter (communication speed parameter) for designating a communication speed, the control unit 11 of the IC card 1 is permitted to change the communication speed. The communication speed setting may be changed according to the communication speed parameter specified in the U frame.

  If it is determined that the received data is not a U frame that specifies a WS value (NO in step S23), the control unit 11 of the IC card 1 continuously receives frames up to the number of WS values that have been set. In this case, the control unit 11 measures the elapsed time since the start frame is received by the timer 11a (step S31). While measuring the time since the first frame was received, the control unit 11 sequentially receives the frames transmitted from the terminal device 2 following the first frame (step S32).

  When the data from the terminal device 2 is received, the control unit 11 performs a process on the received data (step S33). The control unit 11 determines whether reception confirmation is necessary according to the processing content to be executed (step S34). For example, if the received data is a command requesting a specific process, the control unit 11 executes the process requested by the command, and transmits a reception confirmation if the process result is obtained before the timeout time. Since response data can be transmitted before, it is determined that reception confirmation is unnecessary. If the received data is a command that does not require reception confirmation (response is not required), the control unit 11 determines that reception confirmation is unnecessary.

If it is determined that reception confirmation is necessary (step S34, YES), has the control unit 11 passed the time-out time corresponding to the WS value that has been set since the first frame was received? It is determined whether or not (step S35). When the time-out time has not elapsed (step S35, NO), the control unit 11 executes the processes of steps S32 to S34. Note that when the reception of data and the processing for the received data are completed, the control unit 11 may wait until the timeout time is reached. When the timeout time has elapsed (step S35, YES), the control unit 11 transmits a reception confirmation indicating that the data has been received to the terminal device 2 (step S36).
When it is determined that reception confirmation of received data is not necessary (NO in step S34), the control unit 11 proceeds to step S21 after completing the processing for the received data, and enters a data transmission / reception waiting state.

  If response data indicating the processing result for the received data is obtained before the time-out time is reached, the control unit 11 determines that reception confirmation is not required (step S34, NO), and transmits the generated response data. Perform the process. In this case, the control unit 11 proceeds to step S41 and executes a process of transmitting response data.

  When transmitting data (step S22, YES), the control unit 11 determines whether or not the WS value needs to be changed (step S41). For example, when the WS value is set to “4” and the number of frames of data to be transmitted is “3” or “2”, the control unit 11 determines that the WS value needs to be changed. . When it is determined that the WS value needs to be changed (step S41, YES), the control unit 11 determines whether or not the change of the WS value is permitted (step S42). It is assumed that whether to change the WS value is specified in the communication establishment process and stored in the second setting storage unit 13b. However, during the communication, the terminal device 2 may be allowed to specify whether or not to allow the WS value to be changed.

  When it is determined that the change of the WS value is permitted (step S42, YES), the control unit 11 determines the WS value according to the number of frames of data to be transmitted, and stores the WS value in the first setting storage unit 13a. The current WS value is updated to the determined WS value (step S43). When the WS value is updated, the control unit 11 generates a U frame including a parameter (WS value parameter) for specifying the changed WS value, and transmits the generated U frame to the terminal device 2 (step S44). When the U frame including the WS value parameter is transmitted, the control unit 11 continuously transmits the transmission data to the terminal device 2 in units of frames without confirming reception of the U frame (step S45).

  In addition, when it is determined that the change of the WS value is unnecessary (step S41, NO), or when it is determined that the change of the WS value is impossible (prohibited) (step S42, NO), the control unit 11 transmits data in units of frames to the terminal device 2 with the WS value already set stored in the first setting storage unit 13a (step S45). The processes in steps S41 to S45 are not limited to response data transmission, but are applied to data transmission.

  In addition, the IC card 1 and the terminal device 2 may change the communication speed according to the parameters included in the U frame in the same manner as the WS value described above. For example, when it is desired to change the communication speed from the IC card 1 side, if the change of the communication speed is permitted, the control unit 11 transmits a U frame in which a parameter is specified for the communication speed to the terminal device 2 to transmit the communication speed. The setting may be changed.

  Further, the communication processing after the communication is established can be realized by the terminal device 2 by the same processing as the IC card 1. That is, after the communication is established, the terminal device 2 can communicate with the IC card 1 by the communication process similar to steps S21 to S45. The communication method of the present embodiment is not only a processing mode in which the IC card 1 operates in response to a command from the terminal device 2, but also a processing mode in which the terminal device 2 operates in response to a command from the IC card 1. It can also be applied to.

  In the operation example shown in FIG. 5, detailed description of changing the communication speed is omitted, but the communication speed may be changed during the communication as in the case of changing the WS value. That is, the initial value of the communication speed set in the communication establishment process may be changed by a U frame including a parameter for specifying the communication speed. The communication speed can be changed in the same procedure as the WS value change shown in FIG.

  As described above, the IC card of this embodiment sets an initial value of the maximum number of frames that can be continuously transmitted and received in the communication establishment process with the terminal device, and includes a frame including a parameter indicating the maximum number of frames during communication. When received, the setting value of the maximum number of frames is changed based on the parameter. Thereby, in the IC card of the present embodiment, in the full duplex communication with the terminal device, not only the communication establishment process but also the maximum number of frames can be changed during the communication, and efficient data communication can be performed.

  In addition, the IC card and the terminal device according to the present embodiment specify a change in the maximum number of frames by a parameter unilaterally transmitted from the transmission-side device during communication, and include the parameter from the reception-side device. There is no need for a response (acknowledgment) to the frame. Therefore, according to the system of the present embodiment, the change of the maximum frame can be realized easily and at high speed, and efficient communication can be realized. Furthermore, in the IC card system of the present embodiment, since it is possible to set the prohibition of the change of the maximum number of frames during communication in the communication establishment process, it is possible to realize highly reliable communication control.

  DESCRIPTION OF SYMBOLS 1 ... IC card, C ... Main body, 1a ... IC chip, 2 ... Terminal device (mobile phone, external device), 11 ... CPU, 11a ... Timer, 12 ... Program memory, 13 ... Working memory, 13a ... First setting Storage unit, 13b ... Second setting storage unit, 13c ... Third setting storage unit, 14 ... Data memory, 15 ... Communication control unit, 16 ... Power supply unit, 17 ... Interface, 31 ... Control unit, 32 ... RAM, 32a ... first setting storage unit, 32b ... second setting storage unit, 32c ... third setting storage unit, 34 ... non-volatile memory, 35 ... interface.

Claims (11)

A portable electronic device that communicates with an external device,
A communication means for transmitting and receiving data in frame units;
Setting means for setting an initial value of the maximum number of frames that can be continuously transmitted and received by the communication means;
When the communication unit includes a parameter indicating the maximum number of frames in the frame received from the external device, a changing unit that changes the maximum number of frames set by the setting unit based on the parameter;
A portable electronic device comprising: And a second setting means for setting whether or not to allow a change in the initial value of the maximum number of frames.
The changing means changes the maximum number of frames according to the parameter when the change of the maximum number of frames is permitted by the second setting means, and the change of the maximum number of frames is permitted by the second setting means. Prohibit changing the maximum number of frames
The portable electronic device according to claim 1, wherein the portable electronic device is a portable electronic device. The communication means transmits and receives the next data without notification of a response to a frame including a parameter indicating the maximum number of frames.
The portable electronic device according to claim 1, wherein the portable electronic device is a portable electronic device. Furthermore, it has the 3rd setting means which sets the initial value of communication speed,
When the change means includes a parameter indicating a communication speed in a frame received from the external device by the communication means, the communication speed set by the third setting means is changed based on the parameter.
The portable electronic device according to claim 1, wherein the portable electronic device is a portable electronic device. A portable electronic device that communicates with an external device,
A communication unit that transmits and receives data in units of frames; a setting unit that sets an initial value of a maximum number of frames that can be continuously transmitted and received by the communication unit; and a maximum frame number for a frame received from the external device by the communication unit. A module having a changing means for changing the maximum number of frames set by the setting means based on the parameter when including a parameter to indicate,
A housing having the module;
A portable electronic device comprising: A portable electronic device that communicates with an external device,
A communication means for transmitting and receiving data in frame units;
Setting means for setting an initial value of the maximum number of frames that can be continuously transmitted and received by the communication means;
Changing means for changing the maximum number of frames set by the setting means according to data transmitted to the external device;
Transmission processing means for transmitting a frame including a parameter indicating the maximum number of frames changed by the changing means to the external device, and transmitting data in units of frames at the maximum number of frames indicated by the parameters;
A portable electronic device comprising: The transmission processing means transmits data in units of frames at the changed maximum number of frames to wait for a response to transmission of a frame including the parameter indicating the maximum number of frames.
The portable electronic device according to claim 6, wherein: A portable electronic device that communicates with an external device,
A communication unit that transmits and receives data in frame units, a setting unit that sets an initial value of the maximum number of frames that can be continuously transmitted and received by the communication unit, and a setting unit that is set according to data to be transmitted to the external device. A change unit for changing the maximum number of frames, and a frame including a parameter indicating the maximum number of frames changed by the change unit to the external device, and transmitting data in units of frames at the maximum number of frames indicated by the parameter A transmission processing means for performing
A housing having the module;
A portable electronic device comprising: A communication system in which a terminal device and a portable electronic device transmit and receive data,
The portable electronic device comprises:
A first communication means for transmitting and receiving data in frame units;
Setting means for setting a maximum number of frames that can be continuously transmitted and received by the first communication means;
And changing means for changing the maximum number of frames set by the setting means according to the parameters when a parameter indicating the maximum number of frames is included in the frame received from the terminal device by the first communication means. ,
The terminal device
A second communication means for transmitting and receiving data in frame units;
When changing the maximum number of frames according to the data transmitted by the second communication means, a frame including a parameter indicating the maximum number of frames is transmitted to the portable electronic device, and the unit of the frame is the maximum number of frames indicated by the parameters. Transmission processing means for transmitting the data of
A communication system characterized by the above. A communication method used in a portable electronic device that communicates with an external device,
Set an initial value for the maximum number of frames that can be transmitted and received continuously,
Receive data in units of frames with the set maximum number of frames,
When the parameter indicating the maximum number of frames is included in the frame received from the external device, the set maximum number of frames is changed based on the parameter.
A communication method used for a portable electronic device. A communication method used in a portable electronic device that communicates with an external device,
Set an initial value for the maximum number of frames that can be transmitted and received continuously,
Change the set maximum number of frames according to the data to be transmitted to the external device,
When the maximum number of frames is changed, a frame including a parameter indicating the changed maximum number of frames is transmitted to the external device,
Transmitting data in units of frames with the maximum number of frames indicated by the parameter to the external device;
A communication method used for a portable electronic device.

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