KR20110042549A - Smart card and data communication method of mobile phone-smart card - Google Patents

Abstract

PURPOSE: A smart card and a data communication method of a mobile phone-smart card are provided to commonly use an interface for the data communication between a portable terminal and a USIM(Universal Subscriber Identity Module) chip. CONSTITUTION: An authentication chip(130) authenticates a user and stores information. An NFC(Near Field Communication) chip or a Zigbee chip performs the near filed wireless communication with an external device. A common interface performs data communication with a portable terminal, and the data communication between the portable terminal and the authentication chip is relayed through a UART(Universal Asynchronous Receiver Transmitter) communication. The data communication between the portable terminal and the NFC chip or Zigbee chip is performed by using an SMS(Short Message Service) data transmission channel between the portable terminal and the authentication chip.

Description

Smart card and data communication method of mobile phone-smart card}

The present invention relates to a data communication method between a smart card and a portable terminal and a smart card mounted on the portable terminal, and more particularly, a smart card and a portable terminal integrated with a USIM chip and a wireless communication chip for short-range wireless communication. The present invention relates to a smart card capable of efficiently communicating data between terminals and a data communication method between a smart card and a mobile terminal.

In the case of 3rd generation mobile communication terminals, a Universal Subscriber Identity Module (USIM) card must be installed to be authenticated, and payment can be made through call and NFC technology. Since it is possible to transmit and receive data by short-range communication with another terminal, the USIM card and the NFC communication apparatus must exist in the mobile communication terminal for authentication and data transmission and reception using the mobile communication terminal.

USIM is a term used in UMTS, a third-generation mobile communication standard, and is called SIM in GSM and Removable User Identity Module (RUIM) in CDMA. The USIM card has two standard sizes, one is 85.60mm x 53.98mm x 0.76mm, the size of a credit card, and the other is a mini SIM card or plug-in SIM. Also called 25mm x 15mm x 0.76mm.

1 is a block diagram of a conventional general USIM card. Since the USIM 10 is focused on storing only important information about the user, the internal configuration is mainly memory. The CPU 14 has a ROM 22 and a RAM 20 for internal processing, and an EEPROM 18 for storing user information. The authentication unit 12 implements an authentication algorithm to protect user information. The authentication unit 12 is a CAVE algorithm using a 128 bit A-Key, and is connected to a home location register (HLR) of a network operator. Interface 16 is a structure for connecting the USIM card and the terminal, in the prior art is directly connected to the interface of the mobile phone terminal.

Since the conventional SIM card is focused on user authentication and information storage, a slot for a separate wireless communication in a mobile terminal for wireless communication including a short range communication using an NFC chip or a personal area network using Zigbee. There is a problem in that it is complicated and expensive to install.

Recently, a Zigbee module has been developed in the form of a dongle in a TTA-certified 24-pin standard connector to attach a Zigbee to a mobile phone, but this is a Zigbee modem that communicates with a mobile phone using the connector's power and serial communication port. As a result, both the ZigBee protocol stack and the network configuration are made inside the ZigBee modem, and there is a problem that the ZigBee protocol stack operates independently from the mobile phone terminal.

Accordingly, an object of the present invention is to provide a smart card and a data communication method between the smart card and the portable terminal that can overcome the above-mentioned conventional problems.

Another object of the present invention is to provide a smart card having a structure in which an NFC or Zigbee chip and a USIM are integrated in one smart card, and a data communication method between the smart card and a mobile terminal.

Another object of the present invention is a smart card and a smart card and a mobile terminal capable of performing data communication for information processing of the mobile terminal and the NFC or ZigBee chip using a common interface for data communication between the mobile terminal and the USIM chip. To provide a data communication method between the.

According to an embodiment of the present invention for achieving some of the above technical problems, a smart card with a wireless communication chip for short-range wireless communication with the outside and an authentication chip for user authentication and information storage according to the present invention, and In a data communication method between a mobile terminal having a smart card mounted in a SIM slot, the data communication between the mobile terminal and the authentication chip is mediated by the wireless communication chip through a built-in universal asynchronous receiver transmitter (UART) communication. Data communication between the wireless communication chip is performed by using a Short Message Service (SMS) data transmission channel between the mobile terminal and the authentication chip.

The wireless communication chip may be a near field communication (NFC) chip or a Zigbee chip having a data relay function.

The portable terminal and the wireless communication chip may perform data communication between the portable terminal and the wireless communication chip using a common API (Application Programming Interface) for SMS-related communication between the portable terminal and the authentication chip. .

The authentication chip may be a USIM chip or a SIM chip.

The SMS data transmitted between the portable terminal and the authentication chip and the data transmitted between the portable terminal and the wireless communication chip may have different data formats.

According to another embodiment of the present invention for achieving some of the technical problems described above, the smart card for mounting in the SIM slot of the mobile terminal according to the present invention, the authentication chip for user authentication and information storage, and a short distance from the outside Built-in NFC chip or Zigbee chip for wireless communication, and performs data communication with the mobile terminal using a common interface, the data communication between the mobile terminal and the authentication chip is the NFC chip or Zigbee chip Mediated through built-in Universal Asynchronous Receiver Transmitter (UART) communication, and data communication between the mobile terminal and the NFC chip or Zigbee chip is performed using a Short Message Service (SMS) data transmission channel between the mobile terminal and the authentication chip. do.

According to the present invention, by integrating the conventional USIM chip function and short-range wireless communication chips such as NFC and Zigbee to implement as a single smart card, by using the interface in common, it is possible to achieve the efficiency and cost reduction of data communication do. In addition, there is an effect that can perform short-range wireless communication without the addition of a separate device inside the portable terminal. In addition, regardless of whether the WIPI (Wireless Internet For Interoperability), which is a Korean standard that defines a method of operating separately from an external device and a terminal OS, can be driven through a system implemented in a portable terminal.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings without intending to intend to provide a thorough understanding of the present invention to a person having ordinary skill in the art to which the present invention belongs.

Figure 2 shows the configuration of a smart card according to an embodiment of the present invention.

As shown in FIG. 2, the smart card 100 according to an embodiment of the present invention has a structure in which an ISO7816 interface 110, a wireless communication chip 120, and an authentication chip 130 are combined.

In the case of the USIM chip mounted in the conventional portable terminal, it was configured in the form of the ISO7816 interface 110 and the authentication chip 130. In the present invention, the wireless communication chip 120 is embedded in the smart card 100 together with the authentication chip 130, and the wireless communication chip 120 uses the built-in UART (Universal Asynchronous Receiver Transmitter) intermediary communication for the authentication It performs a mediation function of the data communication between the chip 130 and the mobile terminal, and performs data communication between the wireless communication chip 120 and the mobile terminal using the ISO7816 (UART) interface 110.

The data mediation function of the wireless communication chip 120 uses UART (Universal Asynchronous Receiver Transmitter) mediation communication. In addition, if the portable terminal receives the Answer to Reset (ATR) sequence and then the necessary parameter is transmitted from the card to the portable terminal, it is also possible to use another intermediary communication method in which interface parameters are modified in ISO7816. All cards of the ISO7816 standard start to operate based on the ATR that the card responds to by the reset signal of the mobile terminal, and the protocol and power supply voltage can be determined by the response of the ATR. Therefore, the ISO7816 interface parameters are modified within the standard. This will be possible.

Currently, mobile terminals and USIM cards communicate using the Application Protocol Data Unit (APDU) specified in ISO / IEC 7816-4 and ISO / IEC 7816-8 international standards.

In the present invention, the data communication between the authentication chip 130 in the smart card and the portable terminal is performed using the APDU through the ISO 7816 interface 110.

However, the data communication between the wireless communication chip 120 and the mobile terminal in the smart card using the ISO 7816 interface 110 is the same as the data communication between the authentication chip 130 and the mobile terminal. However, in the case of using the APDU, a format different from the data format for the authentication chip 130 should be used for data classification. In this case, it may be possible to perform data communication using a method other than the data communication APDU between the wireless communication chip 120 and the portable terminal in the smart card.

 The APDU is divided into a command APDU by the mobile terminal and a response APDU of the card to the command APDU. The format is shown in FIG.

As shown in FIG. 4, the command APDU (a) is divided into a header portion that must be transmitted and a body in which fields of data are filled according to whether data to be transmitted or received is present. The body's total data size varies depending on the type of command.

Each byte of CLA and INS indicating the instruction type and P1 / P2 representing the parameter of the instruction belong to the header of the instruction APDU, and the body has Lc indicating the length of data to be transmitted to the card, and then the data of this length is Finally, it is composed of Le indicating the length of data that the terminal should receive.

The response APDU (b) is composed of a data field whose transmission status is determined according to the type of command APDU, and two byte status words SW1 and SW2 indicating a result of command processing. The status word at this time must be transmitted.

2, the authentication chip 130 is a USIM chip for user authentication and information storage used in UMTS, a third generation mobile communication standard, a SIM chip used in GSM, a second generation mobile communication, and a RUIM (Removable User Identity) in CDMA. Module) chip, and includes all authentication chips used for user authentication and information storage of mobile terminals.

The wireless communication chip 120 may include an NFC chip and a Zigbee chip.

The NFC chip is for applying a short-range wireless communication technology. Near field communication (NFC) technology is a non-contact short range wireless communication technology capable of transmitting data at low power in a short distance using an RFID technology using a frequency of 13.56 MHz band. If two or more terminals are in close proximity without a user's artificial manipulation, various contents data as well as authentication data can be exchanged.

The NFC chip mounted on a mobile terminal such as a mobile phone functions as an RF reader for reading information recorded on an external RF card, and is recorded on an RF card (for example, USIM chip) built into the mobile phone by another RF reader. In addition, the RF card (eg, USIM chip) embedded in the mobile phone and the integrated RF card with memory can read, write, and erase data in the internal memory.

Next, ZigBee is to apply the technology for personal area networks. Zigbee refers to small-rate wireless persnal area networks (LR-WPANs) included in IEEE 802.15.4, and in Korea, one 2.4 GHz band is divided into 16 channels. Refers to a system that communicates by setting different spreading methods and data rates for each frequency band.

The network configuration of general personalized wireless communication is divided into Physical, Network, and Application Layer, and Physical Layer = Mac, Network Layer = Zigbee, Application Layer = message transmission and positioning function, and most of the file contents. In this case, the configuration is used.

Zigbee is aiming for small, low power and low cost products, and is currently attracting attention as a technology for ubiquitous computing in the short-distance communication market of 10 ~ 20m and recently attracting attention in wireless networking in homes and offices. .

The wireless communication chips (120, 220) performs short-range wireless communication with external devices provided on the outside of the portable terminal or the outside of the wireless communication chips (120, 220), and transmits the data to the portable terminal. It transmits the transmitted data to the external devices. Of course, NFC chips and Zigbee chips are embedded in the external devices.

3 is a block diagram of a smart card according to another embodiment of the present invention.

As shown in FIG. 3, the smart card 200 according to another embodiment of the present invention has a structure in which an ISO7816 interface 110, a wireless communication chip 220, and an authentication chip 130 are combined. The wireless communication chip 220 includes an MCU (Micro Control Unit) 222 and an NFC chip or Zigbee chip 224 therein.

In the present invention, the wireless communication chip 220 has to perform data communication intermediary between the mobile terminal and the authentication chip 130, and has a structure to perform separate data communication with the mobile terminal. Therefore, a general short-range wireless communication chip may not include a CPU, and in some cases, it may be difficult to perform an intermediary function, so that the MCU 222 is separately provided to solve the problem.

As shown in FIG. 2, when the wireless communication chip 120 does not have a difficulty in performing a data mediation function or there is a CPU or the like in charge therein, the MCU 222 may not be necessary.

2 and 3, the data communication between the mobile terminal and the authentication chip 130, that is, the response APDU to the command APDU of the mobile terminal is performed using the UART intermediary communication in the wireless communication chips 120 and 220. Except for mediating data between the terminal and the authentication chip 130, it is the same as the conventional method.

In this case, data communication between the mobile terminal and the wireless communication chip 120 is problematic. That is, when the mobile terminal sends data to the wireless communication chip 120 or when the wireless communication chip 120 tries to send data to the mobile terminal, a problem may occur.

That is, since the authentication chip 130 and the common interface are used, there must be a method for identifying data, and whether a sufficient amount of data can be sent and received.

It has already been described that the data identification problem may be performed by using a data format different from that of the APDU or by indicating that the data of the wireless communication chips 120 and 220 are in the header of the APDU.

Secondly, it is a matter of whether a sufficient amount of data for short-range wireless communication can be transmitted. This may be possible by using an SMS data transmission channel between the mobile terminal and the authentication chip 130.

The SMS data must have a structure as shown in Fig. 5 according to the ISO7816 standard, and it is prescribed to use as much as 176 bytes. In the general short-range wireless communication, since the amount of data does not exceed 176 bytes, it is possible to transmit data using the SMS data transmission channel.

In summary, data communication between the mobile terminal and the wireless communication chips 120 and 220 may use an SMS data transmission channel between the mobile terminal and the authentication chip 130. That is, data communication between the mobile terminal and the wireless communication chips 120 and 220 is performed by using an API (Application Programming Interface) for SMS related communication between the mobile terminal and the authentication chip in common.

The identification of the data is performed in the case of the mobile terminal or the authentication chip 130, in the case of the SMS data, in the ISO 7816 standard, or in a predetermined data format (for example, when the field of the EFsms value is 6F3C, D = '00 FF. ....... FF ') will accept the data as SMS short message. Since there are no other protocols, data communication between the mobile terminal and the wireless communication chips 120 and 220 may be possible by defining a length of 176 bytes of the corresponding field as a data communication format. In this case, the OS system of the portable terminal needs to read the designated block size (176 to 180 bytes), and the field data read from the portable terminal has a different format from the SMS data (for example, D = '01 .. ............. '), that is, if the first byte is not the data set to' 00 ', it can be regarded as data transmitted from the wireless communication chip (120,220). It is.

This is the same even when the mobile terminal transmits data to the smart card (100,200).

6 and 7 are flowcharts illustrating data communication operations of the mobile terminal and the smart cards 100 and 200. FIG. 6 is a flowchart illustrating an operation in which data is transmitted from the portable terminal to the smart cards 10 and 200, and FIG. 7 is a flowchart of an operation in the case of transmitting data from the smart cards 100 and 200 to the portable terminal.

As shown in Figure 6, the mobile terminal transmits the data to the smart card (100,200) (S102). The data transmitted from the portable terminal to the smart card (100,200) is to transmit data to the external terminal located at a short distance with the portable terminal via the wireless communication chip (120,220), or to the authentication chip 130 It may be for storing data or loading data of the authentication chip 130.

The smart card 100 or 200 determines whether the data to be transmitted is transmitted through the SMS data communication channel (S104). Whether the transmitted data is transmitted through the SMS data communication channel is determined by the wireless communication chips 120 and 220.

In the wireless communication chips 120 and 220, when the transmitted data is not transmitted through the SMS data communication channel (N), the data is relayed to the authentication chip 130, and the transmitted data is transmitted through the SMS transmission channel. In (Y), it is determined whether it is an SMS data format or a data format for data communication with the wireless communication chips 120 and 220 (S106).

If the transmitted data is not in the SMS data format (N), the wireless communication chip 120, 220 determines that the portable terminal is data for data communication with the wireless communication chip 120, 130 and performs the operation accordingly. . For example, the transmission and reception operation such as transmitting the transmitted data to an external device through short-range wireless communication or receiving data transmitted from the external device is performed (S112).

If the transmitted data has an SMS data format (Y), the data is mediated to the authentication chip 130 (S108), and the authentication chip 130 performs information processing such as response or storage (S110).

The authentication chip 130 or the wireless communication chips 120 and 220 process data transmitted from the mobile terminal, and transmit data such as a response thereto to the mobile terminal. The transmission method is the reverse of the above. That is, when data is transmitted from the authentication chip 130, the wireless communication chips 120 and 220 are relayed and sent to the mobile terminal, and the data generated from the wireless communication chips 120 and 220 are directly transmitted to the mobile terminal. . A process of processing the message transmitted from the smart card 100 or 200 in the mobile terminal will be described with reference to FIG. 7.

As shown in FIG. 7, data is transmitted from the smart card to the mobile terminal (S202). When the data is transmitted, the portable terminal receives data through the ISO 7816 interface (S204), and determines whether the data received from the system of the portable terminal is transmitted through the SMS data communication channel (S206). If the received data is not transmitted through the SMS data communication channel (N), the portable terminal determines that the data is transmitted from the authentication chip 130 and performs data information processing (S210).

When the received data is transmitted through the SMS data communication channel (Y), the portable terminal determines whether the transmitted data has the SMS data format (S208). If the transmitted data has an SMS data format (Y), the portable terminal determines that the data is transmitted from the authentication chip 130 and performs data information processing (S210). However, if the transmitted data does not have an SMS data format but has a different data format (N), it is determined that the data is transmitted from the wireless communication chips 120 and 220 and the data information processing operation is performed (S212).

As described above, according to the present invention, by integrating the conventional USIM chip functions and short-range wireless communication chips such as NFC and Zigbee to implement as a single smart card, by using the interface in common, the efficiency and cost of data communication Savings can be achieved. In addition, there is an effect that can perform short-range wireless communication without the addition of a separate device inside the portable terminal.

In addition, regardless of whether the WIPI (Wireless Internet For Interoperability), which is a Korean standard that defines a method of operating separately from an external device and a terminal OS, can be driven through a system implemented in a portable terminal.

In the present invention, the mobile terminal may include all mobile devices having an SMS function, including a mobile phone, a PDA, and the like.

The above description of the embodiments is merely given by way of example with reference to the drawings for a more thorough understanding of the present invention, and should not be construed as limiting the present invention. It will be apparent to those skilled in the art that various changes and modifications may be made without departing from the basic principles of the present invention.

1 is a configuration diagram of a conventional USIM card,

2 and 3 is a block diagram of a smart card according to an embodiment of the present invention,

4 is a structural diagram of a command APDU and a command APDU,

5 shows the SMS data format in the ISO 7816 standard,

6 is an operation flowchart when data is transferred from the mobile terminal to the smart card.

7 is a flowchart illustrating the operation when data is transmitted from the smart card to the mobile terminal.

* Description of the symbols for the main parts of the drawings *

100, 200: smart card 110: interface

120,220: Wireless communication chip 130: Authentication chip (USIM)

Claims (6)

In a data communication method between a smart card having a wireless communication chip for short-range wireless communication with the outside, an authentication chip for user authentication and information storage, and a mobile terminal having the smart card mounted in a SIM slot: Data communication between the mobile terminal and the authentication chip is mediated by the wireless communication chip through a built-in Universal Asynchronous Receiver Transmitter (UART) communication, and data communication between the mobile terminal and the wireless communication chip is performed between the mobile terminal and the authentication chip. Data communication method characterized in that performed using the SMS (Short Message Service) data transmission channel The method according to claim 1, The wireless communication chip is a data communication method characterized in that the NFC (Near Field Communication) chip or Zigbee (Zigbee) chip having a data intermediation function. The method according to claim 1 or 2, The portable terminal and the wireless communication chip perform data communication between the portable terminal and the wireless communication chip using a common API (Application Programming Interface) for SMS-related communication between the mobile terminal and the authentication chip. Data communication method. The method of claim 3, The authentication chip is a data communication method, characterized in that the USIM chip or SIM chip. The method according to claim 1, SMS data transmitted between the portable terminal and the authentication chip and data transmitted between the portable terminal and the wireless communication chip have different data formats. In the smart card to be mounted in the SIM slot of the mobile terminal: An authentication chip for user authentication and information storage, an NFC chip or Zigbee chip for short-range wireless communication with the outside, and data communication with the portable terminal are performed using a common interface, Data communication between the mobile terminal and the authentication chip is mediated by the NFC chip or ZigBee chip through a built-in Universal Asynchronous Receiver Transmitter (UART) communication, the data communication between the mobile terminal and the NFC chip or ZigBee chip is Smart card, characterized in that performed using the SMS (Short Message Service) data transmission channel between the authentication chip.

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