CN102073887B - Radio frequency SIM card communication system and method for controlling effective distance thereof - Google Patents
Radio frequency SIM card communication system and method for controlling effective distance thereof Download PDFInfo
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- CN102073887B CN102073887B CN 201010618201 CN201010618201A CN102073887B CN 102073887 B CN102073887 B CN 102073887B CN 201010618201 CN201010618201 CN 201010618201 CN 201010618201 A CN201010618201 A CN 201010618201A CN 102073887 B CN102073887 B CN 102073887B
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Abstract
The invention discloses a radio frequency subscriber identity module (SIM) card communication system. The system comprises a reader-writer (13), and a radio frequency SIM card (11) arranged in a mobile communication terminal (12), wherein the reader-writer (13) sends a modulation signal which comprises a control parameter through a built-in sending coil (135); the radio frequency SIM card (11) in the effective electromagnetic field range of the sending coil (135) receives the modulation signal through a built-in induction coil (114) and demodulates the modulation signal to acquire the control parameter; and the reader-writer (13) and the radio frequency SIM card (11) establish radio frequency communication connection for communication according to the control parameter. The invention also discloses a method for controlling the effective distance of the radio frequency SIM card communication system. By the method, a radio frequency communication distance between the mobile terminal with the built-in radio frequency SIM card and the reader-writer is reliably controlled within 10cm, the safety of communication data is ensured, and data tracking, data interception and hostile attack can be effectively prevented.
Description
Technical field
The invention belongs to the SIM card communication field, be specifically related to a kind of communication system of radio-frequency SIM card and utilize this system to carry out the radio-frequency SIM card communication apart from the method for control.
Background technology
SIM (Subscriber Identity Module) card is the requisite part of mobile communication terminal as the user identification module of mobile communication terminal.The function of horn of plenty mobile communication terminal can increase for SIM card other application and interface on basic SIM card function basis, adopt the radio-frequency communication interface to increase new data transmission approach for SIM card, breaks through the data transmission bottleneck of SIM card.
Radio-frequency SIM card arranges the interface that meets ISO 7816 standards that mates with mobile communication terminal SIM card seat in card, this interface links to each other with microprocessor MPU in the card, by the data that exchange between microprocessor MPU processing and the mobile communication terminal, realize the function of conventional SIM card.Simultaneously, also built-in radio frequency reception and transtation mission circuit, the dual-mode antenna that links to each other with RF transmit-receive circuit in the card, microprocessor MPU in the radio-frequency SIM card is by RF transmit-receive circuit and antenna, carries out wireless telecommunications with supporting read write line, realizes that the function of expansion is used.
When radio-frequency SIM card and read write line communication, adopt be radiofrequency signal have penetrability better, the characteristics of long transmission distance, the barriers such as shell, battery, printing board PCB that can see through mobile communication terminal are transferred to larger distance, like this, just bring larger potential safety hazard to radio-frequency communication, therefore, be necessary to take certain measure, effective range to radio-frequency communication is controlled, and just can carry out data transfer when only having radio-frequency SIM card and read write line distance within effective range.
Summary of the invention
The present invention is for overcoming the problems referred to above, a kind of radio-frequency SIM card communication system has been proposed, described systems approach is by setting up an accessory channel for radio-frequency communication, this accessory channel adopts the mode of electromagnetic induction closely to transmit the control parameter of radio-frequency communication, detect radio-frequency SIM card and read write line whether in the safety communication distance range by this auxiliary communication channel, guarantee the safety of communication data, thereby solve the problem that present radio-frequency SIM card RF system communication distance brings greatly.
Particular content of the present invention is:
A kind of radio-frequency SIM card communication system comprises the radio-frequency SIM card that is built in mobile communication terminal, and supporting read write line.
Described read write line comprises microprocessor MPU, the communication interface with pc circuit that is electrically connected with this microprocessor MPU, RF transmit-receive circuit, antenna, signal conditioning circuit and sends coil.Described communication interface with pc circuit is used for being electrically connected communication with host computer; Described RF transmit-receive circuit and antenna consist of the radio-frequency channel of read write line, are used for carrying out radio-frequency communication with radio-frequency SIM card; Described signal conditioning circuit and transmission coil consist of the accessory channel of read write line, are used for the modulation signal of controlling parameter that comprises of microprocessor MPU output is nursed one's health and sent.
Described radio-frequency SIM card comprises microprocessor MPU, the interface circuit, RF transmit-receive circuit, antenna, electromagnetic induction coil and the signal conditioning circuit that are electrically connected with this microprocessor MPU.Described interface circuit is used for being connected with mobile communication terminal; Described RF transmit-receive circuit and antenna consist of the radio-frequency channel of radio-frequency SIM card, are used for carrying out radio-frequency communication with described supporting read write line; Described electromagnetic induction coil and signal conditioning circuit consist of the accessory channel of radio-frequency SIM card, are used for receiving the modulation signal that read write line sends; Described microprocessor MPU is determined the distance between radio-frequency SIM card and the read write line by the modulation signal that detects and the demodulation accessory channel receives, and obtains the radio-frequency communication control parameter that read write line sends.
The present invention also provides a kind of method of controlling radio-frequency SIM card communication system effective communication distance, and described method comprises the steps:
1, determines to carry out between communication terminal and the read write line frequency of carrier signal of electromagnetic induction the transmission of data.Described carrier signal is the cyclical signal of 500Hz～4KHz, waveform for just/cosine wave (CW), triangular wave, sawtooth wave.
2, on read write line, will control Parameter Modulation on carrier signal by microprocessor, the modulation system that adopts is frequency modulation or amplitude modulation, the signal after the modulation is input to signal conditioning circuit and nurses one's health, and sends to radio-frequency SIM card through sending coil.
When 3, radio-frequency SIM card is near the transmission coil of read write line, receive the modulation signal that read write line sends by inductive coil, nurse one's health through signal conditioning circuit again, signal after the conditioning is input to microprocessor and carries out demodulation, and the control parameter that radio-frequency SIM card obtains according to demodulation is set up and is connected with the radio-frequency communication of read write line.Be to guarantee the safety of radio-frequency channel, radio-frequency SIM card be connected with read write line set up radio-frequency communication and connect after, can further consult communications parameter with cipher mode, prevent without permission can the user data are followed the tracks of and are tackled.
4, in the radio-frequency communication process, the signal that radio-frequency SIM card is sensed according to inductive coil carries out Distance Judgment, when exceeding the effective field scope of read write line transmission coil, the inductive coil of radio-frequency SIM card is because responding to less than enough strong modulation signal, can't obtain the control parameter that read write line sends, then disconnection is connected with the radio-frequency communication of read write line.
Compare with present technology, the invention has the advantages that:
1, scheme of the present invention is with low cost, simple;
2, scheme of the present invention can make the portable terminal of built-in radio-frequency SIM card and the radio-frequency communication between the read write line be controlled at reliably in the 10cm, has guaranteed the safety of communication data, can effectively take precautions against data tracking, interception and malicious attack.
Description of drawings
Fig. 1 is the synoptic diagram of system of the present invention;
Fig. 2 is the logic diagram of radio-frequency SIM card of the present invention;
Fig. 3 is the logic diagram of read write line of the present invention;
Embodiment
Below in conjunction with accompanying drawing the specific embodiment of the present invention is done and to be elaborated.
The logic diagram of described radio-frequency SIM card 11 as shown in Figure 2, radio-frequency SIM card 11 comprises microprocessor MPU 111, RF transmit-receive circuit 112, antenna 113, inductive coil 114, signal conditioning circuit 115 and interface circuit 116.
The microprocessor MPU 111 of described radio-frequency SIM card 11 is electrically connected with RF transmit-receive circuit 112, and RF transmit-receive circuit 112 and antenna 113 are electrically connected.The instruction and data of microprocessor MPU 111 sends by antenna 113 by RF transmit-receive circuit 112 conversions are rear, and RF transmit-receive circuit 112 receives the instruction and data of read write lines 13 by antenna 113 and transfers to microprocessor MPU 111 and process.
Little processing processor MPU 111 of described radio-frequency SIM card 11 is electrically connected with signal conditioning circuit 115, and signal conditioning circuit 115 is electrically connected with inductive coil 114.Transfer to microprocessor MPU 111 after the modulation signal that inductive coil 114 inductions receive is nursed one's health through signal conditioning circuit 115 and carry out the controlled parameter of demodulation.
The microprocessor MPU 111 of described radio-frequency SIM card 11 is electrically connected with interface circuit 116.Radio-frequency SIM card is by interface circuit 116 and portable terminal 12 swap datas.
The logic diagram of described read write line 13 as shown in Figure 3, read write line 13 embedded micro-processor MPU 131, RF transmit-receive circuit 132, antenna 133, signal conditioning circuit 134, transmitting coil 135 and host computer interface circuit.
The microprocessor MPU 131 of described read write line 13 is electrically connected with RF transmit-receive circuit 132, and RF transmit-receive circuit 132 and antenna 133 are electrically connected.The instruction and data of microprocessor MPU 131 sends by antenna 133 after by RF transmit-receive circuit 132 conversion, and the instruction and data that RF transmit-receive circuit 132 sends by antenna 133 received RF SIM card 11 is also transferred to microprocessor MPU 131 and processed.
The microprocessor MPU 131 of described read write line 13 is electrically connected with signal conditioning circuit 134, and signal conditioning circuit 134 is electrically connected with transmitting coil 135.The control parameter is modulated by microprocessor MPU 131, and the signal after the modulation is launched by transmitting coil 135 after nursing one's health through signal conditioning circuit 134.
The microprocessor MPU 131 of described read write line 13 is electrically connected with host computer interface circuit 136.Host computer interface circuit 136 provides the communication channel between read write line 13 and the host computer.
The method of control radio-frequency communication distance of the present invention comprises the steps:
1, determine to pass through between portable terminal 12 and the read write line 13 frequency of carrier signal of accessory channel the transmission of data, described carrier signal is the cyclical signal of 500Hz～4KHz.
2, on read write line 13, to control Parameter Modulation on carrier signal by microprocessor MPU 131, the modulation system that adopts is frequency modulation or amplitude modulation, and the signal after the modulation is input to signal conditioning circuit 134 and nurses one's health, and sends to radio-frequency SIM card 11 through sending coil.
3, radio-frequency SIM card 11 receives the modulation signal that read write line 13 sends by inductive coil 114, nursed one's health by 115 pairs of signals of sensing of signal conditioning circuit, signal after the conditioning is input to microprocessor MPU 111 and carries out demodulation, and the control parameter that radio-frequency SIM card 11 obtains according to demodulation is set up and is connected with the radio-frequency communication of read write line 13.
4, in the radio-frequency communication process, the signal that radio-frequency SIM card 11 is sensed according to inductive coil 114 carries out Distance Judgment, exceed read write line 13 by the effective range of the modulation signal that sends coil 133 and send outside the time, radio-frequency SIM card 11 disconnects and being connected with the radio-frequency communication of read write line 13.
In described step 2, read write line 13 is modulated the modulated digital signal that obtains according to the control parameter to carrier signal on microprocessor MPU 131; This modulation signal converts simulating signal to by signal conditioning circuit 134, and amplify, the conditioning such as shaping, obtain waveform and amplitude and all satisfy the simulating signal that short range transmission requires, this simulating signal sends to radio-frequency SIM card 11 through sending coil.
Described carrier signal is the cyclical signal of 500Hz～4KHz, waveform for just/cosine wave (CW), triangular wave, sawtooth wave.
Described modulation system is frequency modulation or amplitude modulation.During mode of frequency regulation, the data 0 respective frequencies A of control information, the data 1 respective frequencies B of control information; During the amplitude modulation mode, data 0 respective amplitude 0 of control information, data 1 respective amplitude of control information is the full width of cloth.
Read write line 13 is after accessory channel sends the control parameter, and the initial parameter of the radio-frequency communication that obtains according to the control calculation of parameter connects RF transmit-receive circuit 112 and is connected the connection of waiting for radio-frequency SIM card with antenna.If in setting time, radio-frequency SIM card 11 fails successfully to connect with read write line 13, and read write line 13 can cycle through accessory channel and send the control parameter, and for preventing illegal tracking, the control parameter that sends each time can be random number.
In described step 3, radio-frequency SIM card 11 is in the effective range of the modulation signal that read write line 13 sends the time, inductive coil 114 can be sensed modulation signal, this faint signal demand amplifies, shaping, relatively waits conditioning through 115 pairs of induced signals of signal conditioning circuit, is met the signal waveform of microprocessor MPU 111 input requirements.
The waveform of 111 pairs of inputs of microprocessor MPU of radio-frequency SIM card 11 carries out demodulation, if the controlled parameter of demodulation success, radio-frequency SIM card 11 will be according to the initial parameter of the radio-frequency communication of controlling the calculation of parameter acquisition, connect simultaneously RF transmit-receive circuit 112 and antenna 113, open the radio-frequency communication function, foundation is connected with card reader 13.
For guaranteeing the safety of radio-frequency channel, radio-frequency SIM card 11 is connected with read write line after setting up the radio-frequency communication connection, can further consult communications parameter with cipher mode, prevent disabled user's tracking, interception and malicious attack.
In described step 4, after the radio-frequency channel that read write line 13 consists of by RF transmit-receive circuit 132 and antenna 133 sends instruction to radio-frequency SIM card 11, can send the control parameter by the accessory channel that signal conditioning circuit 134 and transmission coil 135 consist of, radio-frequency SIM card 11 carries out Distance Judgment after receiving instruction and control parameter, only when the distance of radio-frequency SIM and read write line effective range (＜10cm) in the time just can carry out the processing of instruction, otherwise radio-frequency SIM card 11 will disconnect and being connected of read write line 13.
Claims (6)
1. radio-frequency SIM card communication system, can realize the control to the radio-frequency communication distance of radio-frequency SIM card, this system comprises read write line (13) and is built in the radio-frequency SIM card (11) of mobile communication terminal (12), described read write line (13) sends by its built-in transmission coil (135) and comprises the modulation signal of controlling parameter, radio-frequency SIM card (11) in the effective field scope of this transmission coil (135) receives modulation signal and demodulation by built-in inductive coil (114), obtain the control parameter, described read write line (13) and radio-frequency SIM card (11) obtain the initial parameter of radio-frequency communication according to this control calculation of parameter, set up the radio-frequency communication connection and carry out communication, and in the radio-frequency communication process, the signal that radio-frequency SIM card (11) is sensed according to inductive coil (114) carries out Distance Judgment, when exceeding the effective range of read write line (13) by the modulation signal that sends coil (135) and send, radio-frequency SIM card (11) disconnects and being connected with the radio-frequency communication of read write line (13); Wherein,
Described read write line (13) comprises first microprocessor MPU(131) and first signal modulate circuit (134), described first microprocessor MPU(131) is electrically connected with this first signal modulate circuit (134) and transmitting coil (135) successively, the control parameter is by described first microprocessor MPU(131) be modulated on the periodicity carrier signal that frequency is 500Hz ~ 4KHz, through described first signal modulate circuit (134) conditioning, obtain waveform and amplitude and all satisfy the simulating signal that short range transmission requires, launched by described transmitting coil (135) again;
Described read write line (13) also comprises the first RF transmit-receive circuit (132) and the first antenna (133), described first microprocessor MPU(131) is electrically connected with this first RF transmit-receive circuit (132) and the first antenna (133) successively, described first microprocessor MPU(131) instruction and data sends by this first antenna (133) after described the first RF transmit-receive circuit (132) conversion, and the instruction and data that described the first RF transmit-receive circuit (132) also sends by this first antenna (133) received RF SIM card (11), and transfer to described first microprocessor MPU(131) process.
2. system according to claim 1, it is characterized in that, described read write line (13) also comprises the host computer interface circuit, described first microprocessor MPU(131) is electrically connected with this host computer interface circuit (136), is used for providing the communication channel between described read write line (13) and the host computer.
3. system according to claim 1 and 2, it is characterized in that, described radio-frequency SIM card (11) also comprises the second microprocessor MPU (111) and secondary signal modulate circuit (115), transfers to this second microprocessor MPU (111) after the modulation signal that described inductive coil (114) is sensed is nursed one's health through this secondary signal modulate circuit (115) and carries out the controlled parameter of demodulation.
4. system according to claim 3, it is characterized in that, described radio-frequency SIM card (11) also comprises the second RF transmit-receive circuit (112) and the second antenna (113), described the second microprocessor MPU (111) is electrically connected with this second RF transmit-receive circuit (112), this second RF transmit-receive circuit (112) and described the second antenna (113) are electrically connected, the instruction and data of described the second microprocessor MPU (111) sends by this second antenna (113) after changing by this second RF transmit-receive circuit (112), described the second RF transmit-receive circuit (112) also receives the instruction and data of described read write line (13) by described the second antenna (113), and transfers to this second microprocessor MPU (111) and process.
5. system according to claim 4, it is characterized in that, described radio-frequency SIM card (11) also comprises interface circuit (116), described the second microprocessor MPU (111) is electrically connected with this interface circuit (116), and described radio-frequency SIM card (11) is by this interface circuit (116) and described portable terminal (12) swap data.
6. method of controlling radio-frequency SIM card communication system effective communication distance, the control of the communication distance between the read write line (13) that is used for being built in the radio-frequency SIM card (11) of portable terminal (12) and is mated, the method comprises (A): read write line (13) sends the step that comprises the modulation signal of controlling parameter by its built-in transmitting coil (135), and this modulation signal obtains by controlling on the periodicity carrier signal that Parameter Modulation is 500Hz ~ 4KHz to frequency; (B): the radio-frequency SIM card (11) in the effective field scope of described transmitting coil (135) receives signal and demodulation by built-in inductive coil (114), obtain the control parameter, obtain again the initial parameter of radio-frequency communication according to the control calculation of parameter, set up the step that is connected with the radio-frequency communication of read write line (13); Wherein,
In the radio-frequency communication process, the signal that described radio-frequency SIM card (11) is sensed according to described inductive coil (114) carries out Distance Judgment, when exceeding the effective range that described read write line (13) sends by described transmission coil (133), described radio-frequency SIM card (11) disconnects and being connected with the radio-frequency communication of described read write line (13);
Described radio-frequency SIM card be connected with read write line set up radio-frequency communication and connect after, can further consult communications parameter with cipher mode, prevent without permission can the user data are followed the tracks of and are tackled.
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| Application Number | Priority Date | Filing Date | Title |
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| CN 201010618201 CN102073887B (en) | 2010-12-31 | 2010-12-31 | Radio frequency SIM card communication system and method for controlling effective distance thereof |
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| CN 201010618201 CN102073887B (en) | 2010-12-31 | 2010-12-31 | Radio frequency SIM card communication system and method for controlling effective distance thereof |
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| CN102073887B true CN102073887B (en) | 2013-04-17 |
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Families Citing this family (4)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN103150532A (en) * | 2013-03-28 | 2013-06-12 | 东信和平科技股份有限公司 | Capacitive sensing method and device for double-interface card reader |
| CN103400184B (en) * | 2013-08-02 | 2016-08-03 | 李嘉斌 | A kind of SIM, mobile terminal, system and recognition methods thereof |
| CN104125342B (en) * | 2014-08-11 | 2016-07-06 | 李麟飞 | The communication that a kind of mobile communication terminal separates with user identity smart card uses way |
| CN111353560A (en) * | 2020-03-09 | 2020-06-30 | 南方科技大学 | Detection system and signal acquisition device |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101739583A (en) * | 2008-11-26 | 2010-06-16 | 国民技术股份有限公司 | Radio frequency SIM card, radio frequency card reader and magnetic induction control method for radio frequency communication |
| CN201527655U (en) * | 2009-10-23 | 2010-07-14 | 厦门盛华电子科技有限公司 | Non-contact IC card double-frequency card reading device with mobile phone card swiping distance detecting function |
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Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101739583A (en) * | 2008-11-26 | 2010-06-16 | 国民技术股份有限公司 | Radio frequency SIM card, radio frequency card reader and magnetic induction control method for radio frequency communication |
| CN201527655U (en) * | 2009-10-23 | 2010-07-14 | 厦门盛华电子科技有限公司 | Non-contact IC card double-frequency card reading device with mobile phone card swiping distance detecting function |
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