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Extension of the SIM card interface in GSM devices

A circuit configuration, interface technology, applied in the direction of selection device, transmission line coupling device, radio/induction link selection arrangement, etc., can solve the problems of no control signal, increased cost, limited number of GSM modems, etc.

Inactive Publication Date: 2006-08-30
辛特里昂无线电模块有限责任公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, standard GSM modems have no control signals available externally
[0006] Therefore, some of the above-mentioned circuits are designed to be integrated in a GSM modem, which has the following disadvantage: every GSM modem manufactured in the range must be equipped with one such circuit, whether required or not, as a result of modern manufacturing methods
This solution also entails an increase in cost and relies on the use of an RSA-capable GSM modem, which is available in limited quantities on the market

Method used

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  • Extension of the SIM card interface in GSM devices
  • Extension of the SIM card interface in GSM devices
  • Extension of the SIM card interface in GSM devices

Examples

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Embodiment Construction

[0027] figure 1 A schematic depiction of a SIM card 1 with a socket and a GSM modem 2 is shown. The SIM card 1 and the GSM modem 2 are connected to each other via the following plural lines: a CCVCC line 3, which provides an operating voltage of 3 volts for the SIM card; a CCGND line 4, which provides the SIM card 1 with a ground potential ; a CCIO line 5, which is used as a bidirectional data line; a CCCLK line 6, which represents a clock signal line with a normal clock frequency of about 1MHz-4MHz; and a CCRST line 7, which is used as a reset of the device Wire. The extension of the lines used to connect the SIM card 1 to the GSM modem 2 is indicated by the extension line 8 shown in the center of the figure.

[0028] The SIM card socket additionally has a switch contact 9 which on the one hand monitors whether any SIM card 1 has been inserted into the card socket and on the other hand evaluates whether the SIM card 1 is removed from the SIM card socket during device operat...

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Abstract

The invention relates to a circuit arrangement that acts as an interface between a sim card (1) and a gsm modem (2), said arrangement comprising a bi-directional data line (5) that connects a card data input or output of the sim card (1) to a modem data input or output of the gsm modem (2). The data line (5) is coupled to at least one edge driver (12, 13).

Description

technical field [0001] The invention relates to a circuit arrangement according to the foregoing of claim 1 and to a bidirectional data transmission method according to the foregoing of claim 12. Background technique [0002] SIM cards have been established as an authentication standard for users of GSM mobile radios. In conventional GSM devices, such as mobile telephones, a card reader for the SIM card is integrated in the GSM device. As the functionality of the GSM device increases, so does the importance of the SIM card. However, the SIM card is no longer just used to check the authorization to make a call, but can be used in different applications, such as authorization to enter a secure area, In other words, key replacement, or premium functionality. [0003] In this case, it has been found that for some applications a physical separation between the SIM card reader and the GSM device is feasible. For example, the SIM card can be inserted into a corresponding card re...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04Q7/32H04L5/16H04L25/02H04L25/45H04W88/02
CPCH04W88/02H04L5/16H04L25/028H04L25/45
Inventor 汉斯-于尔根·纽豪斯
Owner 辛特里昂无线电模块有限责任公司
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