KR20120058674A - Active RF SIM/USIM - Google Patents

Abstract

PURPOSE: An RF(Radio Frequency) SIM(Subscriber Identification Module) card is provided to offer stable communication by securing a stable and integrity communication section. CONSTITUTION: A loop antenna is installed at an inside SIM card. An ISO14443 PICC(Proximity Integrated Circuit Card) circuit, module, and chip are embedded in a COB(Chip On Board) of the SIM card. When 13.56Mhz carrier frequency transmitted by a PCD(Proximity Card Device) is detected through a loop coil, external power supplied to the ISO7816 SIM COB is controlled by a switch circuit. A PICC(Proximity Integrated Circuit Card) is operated in a dynamic mode.

Description

Active radio frequency subscriber identification module {Active RF SIM / USIM}

Subscriber Identification Module (SIM) such as mobile phone / smartphone / portable wireless information device (SIM) is an ISO7816 ID000 size and shape smart card's EF (Elementary File) or DF (Dedicated File). It is used as subscriber identification number / mobile phone number of mobile communication by embedding unique serial number and security algorithm such as Electroic Serial Number) or MEID (Mobile Equipment Identifier).

In the early years, the SIM role of the European mobile telecommunication GSM began to be used at the above-mentioned level, but recently, the memory capacity of the SIM has increased to the megabyte level, such as the addition of a phone book, SMS recording, and NFC (Near Field Communication) function. Various technologies are being combined.

On the other hand, there is a commercialization example that implements a traffic card function by embedding the RF coil in the SIM and communicating with the passive method. There is a problem that causes malfunction or communication failure due to the small range of the operation volume defined in ISO14443.

The non-contact method of transportation card technology, which uses a low-frequency carrier frequency of 13.56 MHz and pays traffic charges in a volume (communication section) of less than 10 cm, has become popular since 1996, when PICC technology was first applied to 8,700 buses in Seoul. Since PICC has been applied to credit cards nationwide, since contactless RF credit cards such as Visawave and Paypass have been spread around the world, payment / payment of contactless micropayments and transportation fares has become commonplace in major overseas cities.

As shown in FIG. 2, between the ISO14443 PICC (Pxoximity IC Card) and the PCD (Proximity Card Device Non-contact IC Card Terminal), when the PICC enters within 10 cm communication range (operating volume) of the PCD, the PCD transmits 13.56. The electromotive force is generated by the antenna coil inside the PICC by the MHz carrier frequency to make the power supply voltage, supplying stable power through the correction voltage circuit, and supplying power to the semiconductor chip inside the PICC with the power supply voltage (Vcc) generated inside the card. And passive (passive) communication with the PCD.

Since ISO18000 series RFID tags that use other frequencies also communicate in a passive manner, there is a problem that power generation is unstable or the recognition rate is lowered due to interference when the communication range is far apart.

Meanwhile, NFC (Near Field Communication) technology, which actively communicates within a range of 10 cm with a 13.56 MHz frequency, has been commercialized in mobile communication terminals and portable information devices, and information transmission between mobile communication terminals, and non-contact between RF cards and mobile communication terminals. Various application technologies are commercialized by communication, mobile communication terminal and PCD communication.

Recently, a new technology for contactless communication by connecting an NFC module to ISO7816 terminal 6 of a subscriber identity module (SIM), that is, data transmission to a 13.56MHz card or an external terminal through an NFC module and an antenna of a mobile communication terminal, It is established as an international standard and is in common use.

Meanwhile, in Korea, the international standard ISO7816 4th and 8th terminals are connected to USB D +. Ignoring the international standard to be used as D-, the RF antenna coil is directly connected to the 4th and 8th terminals of ISO7816 to implement a traffic card function using the SIM of a mobile phone. There is also an example of connecting the Anna Coil and the built-in mobile phone for the same purpose. There are several examples of using the PICC to the battery of the mobile phone and using it as a traffic card.

Although most of these use cases seem to have no problem, they can only be used in Korea, and there is a problem that if a SIM module having such a structure is inserted into a foreign terminal, a fatal failure or failure may occur in a circuit inside the terminal.

According to the present invention, 8 terminals of ISO7816 of SIM and USIM are used as they are in accordance with the purpose of international standards, and an RF antenna coil is wound around the COB several times by configuring an internal additional antenna terminal on the chip on board (CIM). The antenna coil is formed on the PCB to implement the subscriber identity module that operates in an active (active) manner in which the semiconductor of the SIM operates with the ISO7816 power supply voltage of the SIM / USIM and the RF operates with this power supply voltage.

Eight terminals defined in ISO7816 Part 2; No. 1 Vcc, No. 2, Reset No. 3 Clock Frequency, No. 4 USB D +, No. 5 GND, No. 6 NFC Module Connection No. 7 Data Input / Output No. 8 USB D- is defined for each terminal. Some parts have been unchanged since 25 years, but according to the development of semiconductor technology, 6 Vpp is used as internal EEPROM program external supply voltage and replaced by smart card internal pumping voltage, then changed to NFC expansion terminal and confirmed as international standard. There is also an example. Ignoring the international standard of using RF antennas 4 and 8 in Korea, it can cause serious problems in compatibility / interoperability.

According to the present invention, the eight external terminals of SIM / USIM use the ISO7816 international standard as it is, but form an RF loop antenna terminal that is not exposed to the inside of the COB to connect a loop coil or PCB loop antenna pattern to a semiconductor chip inside the COB. By implementing the RF wireless communication with active Vcc terminal supply voltage of ISO7816, it overcomes the size and area limitation and interference problem of the existing antenna for passive communication and provides stable and integrity communication. Guaranteed and easy to use in existing mobile phone smartphones.

RF circuit and driver circuit for connecting RF antenna coil to COB internal terminal of SIM / USIM can be packaged as a single COB to be compatible and interoperable even if it is configured as a separate chip inside or outside a single chip. It is not a problem if the joint of terminal No. 1 is jointly selected but it is proposed and established as a new international standard in the future.

It is used like a contactless card by inserting an active RF (radio frequency) subscriber identification module of the present invention into a mobile phone for a GSM mobile communication system used in 180 countries and a SIM / USIM slot of CDMA, SCDMA, 2G, 3G, and 4G. When compared to the conventional passive RF (radio frequency) contactless card, it can be stably communicated within a certain communication range without interference or obstacle. By adding active RF function to mobile phone SIM, various functions such as transportation card, contactless credit card, ID card, electronic key, e-passport, and electronic driver's license can be implemented with mobile phone. If you replace / USIM, you can use it with convenience and security function based on PIN card security unique to smart card.

In particular, instead of being able to use a separate circuit or module in the terminal, such as NFC, it is possible to communicate by securing a stable and integrity communication section operated by the power of the SIM / USIM.

1 is a comparison of ISO7816 ID1 card and ID000 GSM 11.11 SIM SCDMA USIM
2 is an internal structure of ISO14443 PCD PICC RF communication operation volume and PICC PCD.
Figure 3 is an ISO14443 PCD and active Active RF SIM detailed structure of the present invention.
Figure 4 shows NFC and PCD PICC correlation
Figure 5 shows an example of GSM mobile phone NFC SIM and Active RF SIM

It includes basic communication between PICC and PCD, which pays / pays the transportation fee by ATS (Answer to Select), Amti-collision, mutual authentication, etc., by contactless communication in 10Cm operating range (volume) with 13.56MHz radio frequency. Accordingly, various contactless communication methods using the same frequency, such as VICC and RFID, have been commercialized in various fields. Due to the correlation between the basic RF antenna size and PCD of PICC defined in ISO14443, the design of a small size of the wireless loop antenna shortens the communication distance and requires tuning of the PCD antenna. The power must be generated by the 13.56MHz radio frequency carrier transmitted from the PCD. If the size of the wireless loop antenna is smaller than the standard specification, it cannot generate enough power to ensure stable communication and the communication is only possible in the short distance with the PCD. In some cases, the certification test failed to pass.

However, if it is not a matter of generating the power voltage required for PICC, detecting the radio frequency transmitted from PCD can amplify the signal enough to communicate even if the antenna size or Q value is small, and even if the loop coil antenna is small in the SIM, it operates 10cm. Can work normally within range. Therefore, the Vcc voltage of the SIM / USIM is activated by the power supply voltage required for the operation of the chip. The radio frequency is amplified and recognized by the signal of the small wireless loop antenna. Due to the circuit structure that supplies the power, the chip can be operated with a stable power supply out of the passive unstable power supply range.

The SIM is 25mm wide by 15mm wider than the size of the COB plugged into the SIM socket of the mobile phone.The SIM is a very small size defined in ISO7816 ID000.Therefore, the wireless loop coil is connected to two COB internal terminals in addition to the 8 international standard terminals of the COB. The loop antenna must be implemented in a physically limited space even if it is connected. For this reason, the recognition rate of traffic cards implemented by connecting loop antennas to COBs 4 and 8 in Korea could not be good.

In order to solve this problem, the active RF SIM of the present invention is improved by an active radio frequency communication method of supplying power to a wireless module with a Vcc voltage supplied to the SIM socket 1 terminal of a mobile communication terminal, and the PCD through the loop coil antenna. It can solve the communication distance limitation or instability problem of the existing passive contactless communication which generates power by the carrier frequency transmitted from the terminal.

ISO14443 Type A is 100% ASK communication type, Type B is 10% ASK modulation method, two standards are established as international standard, and another 10% modulation method is proposed by Felica card of SONY of Japan-Type C as ISO in 1998 Was not adopted. As a result, the use of the JR JR Suica card in Japan is limited to domestic use in Japan. In order to overcome these limitations, NFC, developed in common with Philips, operates a wireless module by receiving a power supply voltage from a mobile communication terminal in an active manner.

As shown in the figure, the NFC module is connected to the 6th terminal of the subscriber module SIM inside the mobile phone to communicate with SWP (Single Wire Protocole), that is, command by voltage and receive response by current. In addition to smart card SIM, NFC interlocking technology has been commercialized by adding smart card security function to SD flash memory card.

Claims (2)

13.56MHz carrier installed by installing loop antenna inside SIM module, connecting ISO14443 PICC circuit / module / chip to COB (Chip On Board) in SIM and connecting to loop antenna coil When the frequency is detected through the loop coil, the external power supplied to the ISO7816 subscriber identity module COB operates the PICC in active mode through the switch circuit to generate power at the carrier frequency transmitted by the PCD when the existing ISO14443 PICC operates in passive mode. Active PICC subscriber identification module that communicates payment, payment, data exchange, etc. more than 10cm operation volume easily by PCD and communication more stably. Separate loop antenna terminals are installed on the subscriber identification module separately from the 8 terminals of ISO7816 COB to connect loop antennas to the outside of the SIM, and or contact-coupled by terminals to use the external loop antenna and the SIM internal antenna in parallel or to be selected separately. Contactless, contact subscriber identification module with built-in non-contact card which can eliminate radio frequency interference.

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