CN102768725A - Radio frequency device and communication method - Google Patents
Radio frequency device and communication method Download PDFInfo
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- CN102768725A CN102768725A CN2011101124597A CN201110112459A CN102768725A CN 102768725 A CN102768725 A CN 102768725A CN 2011101124597 A CN2011101124597 A CN 2011101124597A CN 201110112459 A CN201110112459 A CN 201110112459A CN 102768725 A CN102768725 A CN 102768725A
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Abstract
The invention relates to a radio frequency device for controlling the radio frequency communication distance and a communication method based on the radio frequency device; the radio frequency device comprises a radio frequency data transceiver module and also comprises a magnetic signal receiving module and a magnetic signal transmitting module, wherein the magnetic signal receiving module is used for receiving a first magnetic signal transmitted by an external radio frequency terminal, and the magnetic signal transmitting module is used for generating and transmitting a second magnetic signal; the radio frequency device controls the communication distance of the radio frequency device and the external radio frequency terminal through the magnetic signal; the radio frequency device exchanges information with the external radio frequency terminal through the radio frequency data transceiver module; and the radio frequency device realizes the bidirectional low-frequency distance control with the aid of the low-frequency magnetic signals and the transmitting module so as to well overcome the problem that the communication distance can be elongated easily in use when the radio frequency devices adopting the unidirectional distance control are adopted, and the risk caused by the elongated communication distance is effectively avoided, and experiences and feelings of users are promoted.
Description
Technical field
The present invention relates to wireless communication field, relate in particular to a kind of radio-frequency unit that utilizes the two-way magnetic flux letter of low frequency to communicate distance control, and based on the communication means of this radio-frequency unit.
Background technology
Along with development of wireless communication devices, mobile communication terminal is generally used as the indispensable daily communication exchange instrument of people.Be used to realize the user identification module Subscriber Identity Module of identity identification function simultaneously, be called for short SIM, also be widely used in moving communicating field as the important component part of mobile communication terminal.Under the constantly progressive expulsive force of smart card techniques; In order to satisfy ever-increasing mobile phone users demand for experience; Through in the various intelligent use functional modules of the inner increase of common SIM, make SIM not only have basic telecommunications functions, can also possess multiple novel capabilities of serving popular daily life; Can satisfy the market demand that constantly changes well, be exactly one of them based on low frequency apart from the radio-frequency SIM card of control function.
Above-mentioned is a kind of special SIM that low frequency magnetic field communication and RF data communications function combine that has based on low frequency apart from the radio-frequency SIM card of control function, and low channel and radio-frequency channel are bound.In some certain applications of said radio-frequency SIM card; Closely payment class like the public transit system electronic bill is used; Mispronounce card and misread card operation and cause unnecessary economic loss for preventing; Must this radio-frequency SIM card and corresponding radio-frequency card reader device be limited in the effective and controlled communication distance scope, the safety of reading and writing both sides' transaction with assurance is with reliable.
Therefore, wireless communication distance control just becomes the above-mentioned technological difficulties that need key breakthrough based on low frequency apart from the radio-frequency SIM card of control function.Those skilled in the art have invented a kind of mode that detects the low frequency magnetic field signal intensity of utilizing and have realized the effectively radio-frequency SIM card of control of communication distance, and this technology is in inner integrated low frequency magnetic induction module of radio-frequency SIM card and preset corresponding threshold level.When getting into the magnetic field that radio-frequency card reader produced; The intensity that this radio-frequency SIM card detects the low frequency magnetic field signal that receives more than or equal to predetermined threshold value after; This radio-frequency SIM card is activated; Show that it gets into the transaction zone of swiping the card of safety, this radio-frequency SIM card starts the radio-frequency channel immediately, and responds the relevant verify data of radio-frequency card reader through the radio-frequency channel.
In the above-mentioned technology; This radio-frequency SIM card has unidirectional low frequency receiving cable; Utilize low frequency signal that the good penetration of shelter and magnetic field intensity are the rule of monotonic decay with distance, can reduce the otherness that various portable terminals bring owing to structure is different with material effectively influences.This radio-frequency SIM card can all portable terminals the low frequency magnetic field threshold value be set to identical; Whether meet the requirements and judge whether insert distance meets the demands, whether should start conclude the business a series of subsequent operations such as affirmation of entity of radio-frequency channel through detecting its low frequency magnetic field intensity that receives; Thereby transaction that realize not have calibration is apart from control, the legitimate correspondence that makes different mobile terminal and radio-frequency card reader apart from unification, be stabilized in the limited and controlled interval range.
But above-mentioned radio-frequency SIM card also exists certain shortcoming.In the above-mentioned technical scheme of mentioning, this radio-frequency SIM card inside only is integrated with low frequency magnetic induction receiver module, the low frequency alternating magnetic field signal that reception that said radio-frequency SIM card can only be unidirectional and detection are provided by radio-frequency card reader.And this radio-frequency SIM card is accomplished through the radio-frequency channel the response of radio-frequency card reader low channel, and this process is mainly used in the transmission of verify data and the binding of transaction entity.This kind mode is easy to generate following problem; After malice is distorted the low frequency propelling movement power that increases radio-frequency card reader or is increased the radio frequency receiving sensitivity; Might cause both sides' effective communication distance to become big, thereby directly have influence on user's transaction process and experience.
Summary of the invention
Technical matters to be solved by this invention provides a kind of radio-frequency unit with the two-way magnetic flux telecommunication function of low frequency; Make the portable terminal of various this kind of application radio-frequency units in the communication distance scope of regulation, can accomplish data interaction safely and reliably, the communication distance that prevents communicating pair is widened and is caused potential safety hazard.
The technical scheme that the present invention solves the problems of the technologies described above is following:
A kind of radio-frequency unit comprises the rf data transceiver module, it is characterized in that, also comprises:
The magnetic signal receiver module is used to receive first magnetic signal that send at the external radio frequency terminal;
The magnetic signal transmitter module is used for producing and launching second magnetic signal;
Said radio-frequency unit is through the communication distance of said magnetic signal control with said external radio frequency terminal, and said radio-frequency unit carries out message exchange through said rf data transceiver module and said external radio frequency terminal.
Further, said radio-frequency unit is judged the radio frequency communication distance between said external radio frequency terminal and the said radio-frequency unit according to first magnetic signal that receives, and sends the radio frequency communication distance confirmation through second magnetic signal to said external radio frequency terminal.
Further, said first magnetic signal carries the identification information at the external radio frequency terminal of this first magnetic signal of emission;
Said second magnetic signal carries the identification information of said radio-frequency unit.
Further, said radio-frequency unit according to first magnetic signal that receives judge with said external radio frequency terminal between distance whether in the effective communication distance of presetting.
Further, said radio-frequency unit also comprises master controller, and said magnetic signal receiver module is used for the electric signal that said first magnetic signal is converted to is sent to said master controller; Electric signal that said master controller is used for being converted to according to first magnetic signal and preset threshold value judge that distance between said radio-frequency unit and the said external radio frequency terminal is whether in the effective communication distance of presetting.
Further, said external radio frequency terminal is a radio-frequency card reader.
Further, said radio-frequency unit also comprises pickup coil, and said pickup coil is used to receive first magnetic signal and is converted into electric signal and sends to said magnetic signal receiver module; Said pickup coil also is used to launch said second magnetic signal that said magnetic signal transmitter module produces.
Further; Said radio-frequency unit also comprises master controller; Said master controller is used to produce the entrained information of second magnetic signal of said magnetic signal transmitter module emission, and said magnetic signal transmitter module is according to the information that said master controller produces, and produces and launches second magnetic signal.
Further, said radio-frequency unit also comprises master controller and pickup coil;
Said master controller is connected with said rf data transceiver module, magnetic signal receiver module and magnetic signal transmitter module respectively; Said pickup coil is connected with the magnetic signal transmitter module with said magnetic signal receiver module respectively;
Said master controller is used to produce the entrained information of said second magnetic signal, and this information is sent to said magnetic signal transmitter module; Said master controller also is used for according to first magnetic signal institute electrical signal converted and preset threshold value, judges that distance between said radio-frequency unit and the said external radio frequency terminal is whether in the effective communication distance of presetting;
Said rf data transceiver module is used for carrying out between said radio-frequency unit and the said external radio frequency terminal transmitting-receiving of rf data;
Said magnetic signal receiver module also is used for the electric signal that said first magnetic signal is converted to is sent to said master controller;
Said magnetic signal transmitter module according to the information that said master controller produces, produces and launches second magnetic signal;
Said pickup coil is used to receive first magnetic signal and is converted into electric signal and sends to said magnetic signal receiver module; Said pickup coil also is used to launch said second magnetic signal that said magnetic signal transmitter module produces.
Further, said radio-frequency unit is a radio-frequency SIM card.
Further, said magnetic signal receiver module comprises amplifying circuit, filtering circuit and the decoding circuit that connects in order, and said amplifying circuit is connected with said pickup coil, and said decoding circuit is connected with said master controller;
Said amplifying circuit is used for the electric signal that first magnetic signal that receives from said pickup coil is converted to is amplified;
Said filtering circuit is used for the electric signal after amplifying is carried out filtering, suppresses noise and interference outside the useful signal frequency band range;
Said decoding circuit is decoded to filtered signal according to the coded system that radio-frequency unit adopted of said first magnetic signal of emission, and sends to said master controller.
Further, said magnetic signal receiver module also comprises the demodulator circuit that is arranged between filtering circuit and the decoding circuit; Said demodulator circuit is used for according to the modulation system that said external radio frequency terminal is adopted filtered signal being carried out demodulation, and sends to said decoding circuit.
Further, said magnetic signal receiver module comprises amplifying circuit and the filtering circuit that connects in order, and said amplifying circuit is connected with said pickup coil, and said filtering circuit is connected with said master controller;
Said amplifying circuit is used for the electric signal that first magnetic signal that receives from said pickup coil is converted to is amplified;
Said filtering circuit is used for the electric signal after amplifying is carried out filtering, suppresses noise and interference outside the useful signal frequency band range;
Said master controller also is used for according to the coded system that radio-frequency unit adopted of said first magnetic signal of emission filtered signal being decoded.
Further, said magnetic signal receiver module also comprises the demodulator circuit that is arranged between filtering circuit and the master controller; Said demodulator circuit is used for according to the modulation system that said external radio frequency terminal is adopted filtered signal being carried out demodulation, and sends to said master controller.
Further, said magnetic signal transmitter module comprises coding circuit, D/A change-over circuit and the driving circuit that connects in order, and said coding circuit is connected with said master controller, and said driving circuit is connected with said pickup coil;
Said master controller is used to produce the low frequency magnetic field information that said radio-frequency unit need be launched, and said Magnetic Field is a digital baseband signal;
Said coding circuit is used for the digital baseband signal that said master controller provides is encoded;
Said D/A change-over circuit is used for converting the digital signal behind the coding into low-frequency analog signal;
Said driving circuit is used to amplify said low-frequency analog signal, and drives said pickup coil generation low frequency alternating magnetic field.
Further, said magnetic signal transmitter module also comprises the modulation circuit that is arranged between said coding circuit and the D/A change-over circuit; Said modulation circuit is used for the digital baseband signal behind the coding is modulated, and sends to said D/A change-over circuit.
Further, said magnetic signal transmitter module comprises D/A change-over circuit and the driving circuit that connects in order, and said D/A change-over circuit is connected with said master controller, and said driving circuit is connected with said pickup coil;
Said master controller is used to produce the low frequency coded data, and sends to said D/A change-over circuit;
Said D/A change-over circuit is used for converting said low frequency coded data into low-frequency analog signal;
Said driving circuit is used to amplify said low-frequency analog signal, and drives said pickup coil generation low frequency alternating magnetic field.
Further, said magnetic signal transmitter module also comprises the modulation circuit that is arranged between said master controller and the D/A change-over circuit; Said modulation circuit is used for said low frequency coded data is modulated, and sends to said D/A change-over circuit; The modulation system of said modulation circuit adopts the digital modulation mode of no changes in amplitude; The modulation system of said modulation circuit is on-off keying method, frequency shift keying, binary phase shift keying method or QPSK method; The waveform of the carrier signal that said modulation circuit adopts is sine wave, triangular wave or square wave.
Further, said pickup coil is the multi-thread circle of low frequency receiving cable, low frequencies passage branch usefulness, the unicoil that perhaps share for low frequency receiving cable, low frequencies passage.
Further; When said pickup coil adopts the unicoil that low frequency receiving cable, low frequencies passage share; Be provided with the simulating signal switch between said unicoil and said low frequency magnetic signal receiver module and the low frequency magnetic signal transmitter module, said simulating signal switch also is connected with said master controller; Said master controller provides switch controlling signal to said simulating signal switch, switches being connected between said low frequency magnetic signal receiver module or low frequency magnetic signal transmitter module and the said unicoil to control said simulating signal switch.
Further, the highest predetermined transmitting-receiving frequency of operation of said magnetic signal receiver module and magnetic signal transmitter module is in tonal range, very low frequency (VLF) frequency range or low frequency frequency range.
Further, the frequency range of said tonal range is 300Hz to 3kHz; The frequency range of said very low frequency (VLF) frequency range is 3kHz to 30kHz; The frequency range of said low frequency frequency range is 30kHz to 300kHz.
Further, said magnetic signal receiver module and the magnetic signal transmitter module radio-frequency unit through TDD mode or mode of frequency division duplexing and emission first magnetic signal two-way communication of hanging down frequency link; And the frequency of operation of the frequency of operation of said magnetic signal receiver module and said magnetic signal transmitter module is less than the highest predetermined transmitting-receiving frequency of operation.
Further, said rf data transceiver module comprises RF transceiver, impedance matching network and the radio-frequency antenna that connects in order, and said RF transceiver also is connected with said master controller.
Further, said RF transceiver adopts the radio communication mode, and frequency of operation is in very high frequency(VHF) VHF frequency range, superfrequency uhf band or ultrahigh frequency SHF frequency range.
Further, said RF transceiver frequency of operation is 433MHz, 915MHz, 2.4GHz or 5.8GHz.
Further, said impedance matching network is used to guarantee radiofrequency signal unreflected maximum power transfer on link of launching or receiving.
The present invention also provides a kind of communication means, comprising:
The mobile communication terminal that is equipped with as above each described radio-frequency unit receives first magnetic signal that send at the external radio frequency terminal, and judge said radio-frequency unit and external radio frequency communication between terminals apart from whether in the scope of preset value;
When communication distance was in preset range, said radio-frequency unit sent the low frequency answer signal to said external radio frequency terminal, and and said external radio frequency carry out data communication through radio frequency between eventually;
During aforementioned radio communication, the continual received RF card reader of said radio-frequency unit is sent first magnetic signal, and judges communication distance whether in the scope of preset value, if communication distance not in preset range the time, then stops aforementioned RF data communications.
Further, after said mobile communication terminal of equipment and the completion of said external radio frequency communication between terminals, said radio-frequency unit gets into dormant state and waits for communication next time.
Further; When communication distance is beyond preset range; Said radio-frequency unit continues attempt to receive first magnetic signal that send at the external radio frequency terminal in first Preset Time, and judge said radio-frequency unit and external radio frequency communication between terminals apart from whether in the scope of preset value.
Further, when said radio-frequency unit does not receive first magnetic signal in first Preset Time, then equip the mobile communication terminal disconnection of said radio-frequency unit and being connected of said external radio frequency terminal, said radio-frequency unit gets into dormant state.
Further; When said radio-frequency unit detects communication distance in preset range the time; Said radio-frequency unit attempts receiving the rf data that send at the external radio frequency terminal in second Preset Time; If in second Preset Time, receive the rf data that send at the external radio frequency terminal, then and said external radio frequency carry out RF data communications between eventually, if in second Preset Time, do not receive the rf data that send at the external radio frequency terminal; Then equip the mobile communication terminal disconnection of said radio-frequency unit and being connected of said external radio frequency terminal, said radio-frequency unit gets into dormant state.
Radio-frequency unit provided by the present invention is applicable to wireless near field communication, comprises different application scenarios such as public transport electronic bill, gate inhibition's identification control and stored value card mobile payment.
Compare with prior art, beneficial effect of the present invention is:
Realize that by magnetic signal receiver module and magnetic signal transmitter module two-way low frequency is apart from control; Can the effective communication distance at the external radio frequency terminal of mobile communication terminal that said radio-frequency unit is installed and the said radio-frequency unit of corresponding support accurately be controlled in the limited and rational interval; Overcome well and adopted unidirectional low frequency in use to occur the problem that the transaction distance is widened by malice easily apart from the radio-frequency unit of control; Effectively avoided the customer transaction data to have been promoted user's experience and impression by the extraneous risk of intercepting and capturing.
Description of drawings
Fig. 1 is the structured flowchart of radio-frequency unit provided by the invention;
Fig. 2 is the structured flowchart of radio-frequency SIM card provided by the present invention;
Fig. 3 is a radio-frequency SIM card inside shown in Figure 2 concrete structure block diagram about magnetic signal transmitter module, magnetic signal receiver module and rf data transceiver module;
Fig. 4 is a kind of planar structure synoptic diagram of radio-frequency SIM card provided by the present invention;
Fig. 5 be radio-frequency SIM card provided by the present invention when the low frequency dispatch coil is shared, adopt the simulating signal switch to carry out the instance theory diagram that the low frequency transceiver channel switches;
Fig. 6 is an application scenarios synoptic diagram of radio-frequency SIM card provided by the present invention;
Fig. 7 is the workflow diagram of a practical implementation case of radio-frequency SIM card provided by the present invention.In the accompanying drawing, the list of parts of each label representative is following:
10, radio-frequency unit,
100, radio-frequency SIM card,
101, master controller,
102, rf data transceiver module,
1021, radio-frequency antenna, 1022, impedance matching network, 1023, RF transceiver,
103, pickup coil,
104, magnetic signal transmitter module,
1041, driving circuit, 1042, the D/A change-over circuit, 1043, modulation circuit, 1044, coding circuit,
105, magnetic signal receiver module,
1051, amplifying circuit, 1052, filtering circuit, 1053, demodulator circuit, 1054, decoding circuit
106, SIM microcontroller,
107, SIM interface module,
201, circuit function module region, 202, pickup coil zone,
301, simulating signal switch, 302, pickup coil,
401, mobile communication terminal, 402, radio-frequency card reader, 403, background server.
Embodiment
Below in conjunction with accompanying drawing principle of the present invention and characteristic are described, institute gives an actual example and only is used to explain the present invention, is not to be used to limit scope of the present invention.
As shown in Figure 1, radio-frequency unit 10 provided by the invention comprises rf data transceiver module 102, also comprises: magnetic signal receiver module 105 is used to receive first magnetic signal that send at the external radio frequency terminal; Magnetic signal transmitter module 104 is used for producing and launching second magnetic signal; Said radio-frequency unit 10 is through the communication distance of said magnetic signal control with said external radio frequency terminal, and said radio-frequency unit carries out message exchange through said rf data transceiver module 104 with said external radio frequency terminal.Wherein the external radio frequency terminal can be radio-frequency card reader.Radio-frequency unit 10 of the present invention can be a kind of radio-frequency SIM card, below said radio-frequency SIM card is further specifically described.
As shown in Figure 2; Radio-frequency SIM card 100 with low frequency bi-directional communication function provided by the present invention comprises master controller 101, rf data transceiver module 102, pickup coil 103, magnetic signal transmitter module 104, magnetic signal receiver module 105, SIM microcontroller 106 and SIM interface module 107.Wherein, said magnetic signal receiver module 105 receives first magnetic signal and sends said master controller 101 to through said pickup coil 103; Magnetic signal transmitter module 104 is used for producing and launches second magnetic signal through said pickup coil 103; Master controller 101 is used for first magnetic signal according to reception and judges the radio frequency communication distance between the radio-frequency unit of said radio-frequency SIM card 100 and this first magnetic signal of emission, and through the radio-frequency unit transmission radio frequency communication distance confirmation of second magnetic signal to emission first magnetic signal.
Wherein, said first magnetic signal carries the identification information of the radio-frequency card reader of this first magnetic signal of emission; Said second magnetic signal carries the identification information of said radio-frequency SIM card 100.The two-way communication that said magnetic signal receiver module 105 and magnetic signal transmitter module 104 hang down frequency link through TDD mode or mode of frequency division duplexing and the radio-frequency card reader of launching first magnetic signal.
As shown in Figure 3, said magnetic signal receiver module 105 is made up of amplifying circuit 1051, filtering circuit 1052, demodulator circuit 1053 and decoding circuit 1054, and is linked in sequence successively; Said amplifying circuit 1051 also is connected with pickup coil 103, and decoding circuit 1054 also is connected with master controller 101.Said demodulator circuit 1053 is nonessential assembly, and when the low frequency magnetic signal that receives was unmodulated baseband signal, said filtering circuit 1052 direct and said decoding circuits 1054 were connected.
Said pickup coil 103 is responded to and is received first magnetic signal that carries this radio-frequency card reader id information that extraneous radio-frequency card reader produces, and converts electric signal into; The electric signal of 1051 pairs of these reflection change of magnetic field strength of said amplifying circuit carries out processing and amplifying, and the amplitude of lifting signal also is adjusted in the predetermined magnitude range; Electric signal after 1052 pairs of amplifications of said filtering circuit carries out Filtering Processing, suppresses noise and interference outside the useful signal frequency band range; Said demodulator circuit 1053 carries out corresponding demodulation process according to the modulation system that radio-frequency card reader adopts to filtered signal; The signal of the coded system that said decoding circuit 1054 adopts according to radio-frequency card reader after to demodulation carries out corresponding decoding processing.At last; 101 pairs of digital baseband signals that obtain through above signal flow of master controller further process; Judge the size of the magnetic field intensity of being sensed according to signal amplitude; Thereby confirm radio-frequency card reader to the one-way communication distance of the mobile communication terminal of the said radio-frequency SIM card 100 of equipment whether in preset range, obtain the radio-frequency card reader id information that carries in the baseband signal simultaneously, and whether decision triggers and carries out next step action.
Said amplifying circuit 1051 can be single-ended amplifying circuit form or differential amplifier circuit form or fully differential amplifying circuit form, and its gain can require to carry out flexible according to communication distance; Said filtering circuit 1052 adopts the analog band-pass filter structure; Can be passive RC filter; Also can be the active filter that constitutes by operational amplifier or special filter IC; Its bandwidth look reception the low frequency magnetic signal centre frequency and decide, and its bound cutoff frequency can be regulated flexibly; The circuit structure form that said demodulator circuit 1053, decoding circuit 1054 adopt is looked the modulation system, coded system of the low frequency magnetic induction signal that receives and is decided.
Said decoding circuit 1054 can be realized decoding through hardware mode by corresponding application-specific integrated circuit, also can realize decoding through the in house software mode by master controller 101; When said decoding circuit 1054 was realized by the application-specific integrated circuit hardware mode, the connected mode of itself and said master controller 101 can be the single serial pattern, also can be multi-thread parallel schema; When said decoding circuit 1054 was realized through the in house software mode by said master controller 101, the low frequency magnetic induction signal of reception was directly delivered to said master controller 101 after amplification, filtering, demodulation (if necessary).
Said magnetic signal transmitter module 104 is made up of coding circuit 1044, modulation circuit 1043, D/A change-over circuit 1042 and driving circuit 1041, is linked in sequence successively; Said coding circuit 1044 also is connected with master controller 101, and said driving circuit 1041 also is connected with pickup coil 103.Said modulation circuit 1043 can be adjusted as required, and in the time only need carrying out the baseband signal transmission for the simplification signal link, said coding circuit 1044 direct and said D/A change-over circuits 1042 are connected.
Said master controller 101 is used to produce the entrained information of second magnetic signal of said radio-frequency SIM card 100 needs emission, and this information is digital baseband signal; Said coding circuit 1044 is used for the digital baseband signal that master controller 101 provides is taked the encoding process of certain way, and the coded system viewing system requires and decides; Said modulation circuit 1043 is used for the digital baseband signal behind the coding is taked the modulation treatment of certain way, and the modulation system viewing system requires and decides; Said D/A change-over circuit 1042 is used for converting the digital modulated signal after coding, the modulation into low-frequency analog signal; Said driving circuit 1041 is used to amplify this low-frequency analog signal, and drives pickup coil 103 generation low frequency alternating magnetic fields, sends second magnetic signal.
The sign indicating number type that said coding circuit 1044 adopts can be selected the code structure of any one no DC component, for example Manchester's cde, Differential Manchester Encoding, alternate mark inversion code (AMI), High Density Bipolar 3 (HDB3), Miller code (Miller) etc.; The modulation system of said modulation circuit 1043 can adopt the digital modulation mode of any one no changes in amplitude; For example on-off keying method (OOK), frequency shift keying (FSK), binary phase shift keying method (BPSK), QPSK method digital modulation modes such as (QPSK), the waveform of carrier signal can be chosen waveforms such as sine wave, triangular wave or square wave; The digital input end of said D/A change-over circuit 1042 can adopt serial input mode or parallel input mode; Analog output can adopt the curtage waveform way of output of single-ended or difference form, and conversion accuracy and switching rate can require to decide according to system performance; Said driving circuit 1041 constitutes for comprising the multistage amplifier circuit that one-level is amplified at least, can being built by integrated operational amplifier, also can be built by the transistor of separation to constitute, and gain can be regulated as required.
Said coding circuit 1044 can be realized coding through hardware mode by corresponding application-specific integrated circuit, also can realize coding through the in house software mode by master controller 101; When said coding circuit 1044 was realized by the application-specific integrated circuit hardware mode, the connected mode of itself and said master controller 101 can be the single serial pattern, also can be multi-thread parallel schema; When said coding circuit 1044 was realized through the in house software mode by said master controller 101, the low frequency coded data that said master controller 101 produces was directly delivered to back level said modulation circuit 1043 (if necessary) or said D/A change-over circuit.
Rf data transceiver module 102 is made up of RF transceiver 1023, impedance matching network 1022 and radio-frequency antenna 1021, is linked in sequence successively; Said RF transceiver 1023 and said master controller 101 are connected through serial bus interface; Can select any one mode bus of supporting full duplex or half-duplex operation, for example serial peripheral bus (SPI) interface, UART Universal Asynchronous Receiver Transmitter (UART) interface etc.; Said impedance matching network 1022 is used to connect RF transceiver 1023 and radio-frequency antenna 1021, and it act as guarantees radiofrequency signal unreflected maximum power transfer on link of launching or receiving; Said radio-frequency antenna 1021 is used for to extraneous space radiation energy of electromagnetic field and receives from aerial electromagnetic field, and it can be unipole antenna form or dipole antenna form.
Said SIM microcontroller 106 is used to store and handle the user identity identification data of the mobile phone that operator the provided service that said radio-frequency SIM card 100 supports, and carries out data interaction with the smart card principal and subordinate interface of master controller 101 through standard; Said SIM interface module 107 is used to provide the external interface of said radio-frequency SIM card 100 with mobile communication terminal, and its interface characteristic meets the requirement of ISO/IEC 7816 standards.
Fig. 4 is the synoptic diagram of wherein a kind of planar structure of radio-frequency SIM card 100 according to the invention.As shown in Figure 4, the structure of said radio-frequency SIM card 100 comprises circuit function module region 201 and pickup coil zone 202.Wherein, said circuit function module region 201 comprises the hardware circuit entity of above-mentioned master controller 101, rf data transceiver module 102, magnetic signal transmitter module 104, magnetic signal receiver module 105, SIM microcontroller 106 and SIM interface module 107; Said pickup coil zone 202 is the PCB coil; Be printed on said radio-frequency SIM card 100 card bodies around; Said pickup coil 202 can individual layer coiling or sandwich wound; Look the PCB number of plies of said radio-frequency SIM card 100 and decide, number of turn scope can be set between 10 to 40 circles, and the physical dimension 25mm that its outer ring size approaches said radio-frequency SIM card 100 takes advantage of 15mm.
Fig. 5 is when the shared pickup coil 302 of the low frequency transceiver channel of said radio-frequency SIM card 100, the instance graph that switches through 301 pairs of low frequency transceiver channels of simulating signal switch.As shown in Figure 5, this instance system is made up of master controller 101, magnetic signal transmitter module 104, magnetic signal receiver module 105, simulating signal switch 301, pickup coil 302.Wherein said master controller 101 provides a switch controlling signal; This signal is a square-wave signal of high and low level checker; Period of change can adjust accordingly according to practical application; Control said simulating signal switch 301 by it, such as when this control signal is high level, said simulating signal switch 301 selects to connect magnetic signal transmitter module 104; When this control signal was low level, said simulating signal switch 301 selected to connect magnetic signal receiver module 105.Thereby realize low frequencies passage and the shared said pickup coil 302 of low frequency receiving cable, help saving cost of products and structure space.Said simulating signal switch 301 can be single-pole double-throw switch (SPDT) or double-point double-throw switch.
Fig. 6 provides a typical application scene instance of radio-frequency SIM card according to the invention.As shown in Figure 6; Said radio-frequency SIM card 100 is equipped in the mobile communication terminal 401; Communicate distance control and data interaction through two-way low channel and two-way radio-frequency channel between said mobile communication terminal 401 and the corresponding radio-frequency card reader 402, said radio-frequency card reader 402 is for further processing rig-site utilization data upload to corresponding background server 403 through corresponding cable data link again.
Fig. 7 provides a case study on implementation that carries out low frequency two-way communication and the transaction of follow-up execution radio frequency based on radio-frequency SIM card of the present invention.As shown in Figure 7, this case study on implementation relates to the transaction flow of utilizing said radio-frequency SIM card to carry out the application of mobile payment class, and said method of work comprises the steps:
Wherein, the said dormant state internal circuit functional module that is defined as said radio-frequency SIM card is in standby mode or power-down mode or low-power consumption mode.
Wherein, activation refers to that the inner corresponding circuit function module of said radio-frequency SIM card gets into normal operating conditions, and this process also can be called to be waken up.
Wherein, Said low frequency reply data is generated by the low frequency magnetic field information of said radio-frequency SIM card according to the said radio-frequency card reader that receives before it, and said low frequency reply data comprises information such as the said radio-frequency SIM card self ID, random number, radio communication frequency, radio communication address of numeral joint length.
Step 513 if said radio-frequency SIM card is received the low frequency magnetic field information that said radio-frequency card reader sends in the said time t1 of step 512, is then returned step 504; If said radio-frequency SIM card is not received any low frequency magnetic field information that said radio-frequency card reader sends after surpassing the said time t1 of step 512 yet, then get into step 514.
Step 516 if said radio-frequency SIM card is received the rf data that said radio-frequency card reader sends in the said time t2 of step 515, is then returned step 509; If said radio-frequency SIM card is not received the rf data that said radio-frequency card reader sends after surpassing the said time t2 of step 515 yet, then get into step 517.
Step 521 is equipped the mobile communication terminal disconnection of said radio-frequency SIM card and being connected of said radio-frequency card reader, stop transaction, and said radio-frequency SIM card returns dormant state.
Said method also can be exchanged radio-frequency SIM card and radio-frequency card reader, carries out the distance judgement through radio-frequency card reader through receiving second magnetic signal.
Radio-frequency SIM card with low frequency two-way function provided by the present invention; Realize that by reception of low frequency magnetic signal and transmitter module two-way low frequency is apart from control; Can the effective communication distance of the radio-frequency card reader of mobile communication terminal and the said radio-frequency SIM card of corresponding support of the said radio-frequency SIM card of equipment accurately be controlled in the limited and rational interval; Overcome the radio-frequency SIM card that adopts one-way distance control well and in use occurred the problem that the transaction distance is zoomed out easily; Avoid distance by the risk of bringing after zooming out effectively, promoted user's experience and impression.
The above is merely preferred embodiment of the present invention, and is in order to restriction the present invention, not all within spirit of the present invention and principle, any modification of being done, is equal to replacement, improvement etc., all should be included within protection scope of the present invention.
Claims (32)
1. a radio-frequency unit comprises the rf data transceiver module, it is characterized in that, also comprises:
The magnetic signal receiver module is used to receive first magnetic signal that send at the external radio frequency terminal;
The magnetic signal transmitter module is used for producing and launching second magnetic signal;
Said radio-frequency unit is through the communication distance of said magnetic signal control with said external radio frequency terminal, and said radio-frequency unit carries out message exchange through said rf data transceiver module and said external radio frequency terminal.
2. radio-frequency unit according to claim 1 is characterized in that:
Said radio-frequency unit is judged the radio frequency communication distance between said external radio frequency terminal and the said radio-frequency unit according to first magnetic signal that receives, and sends the radio frequency communication distance confirmation through second magnetic signal to said external radio frequency terminal.
3. radio-frequency unit according to claim 1 is characterized in that:
Said first magnetic signal carries the identification information at the external radio frequency terminal of this first magnetic signal of emission;
Said second magnetic signal carries the identification information of said radio-frequency unit.
4. radio-frequency unit according to claim 1 is characterized in that: said radio-frequency unit according to first magnetic signal that receives judge with said external radio frequency terminal between distance whether in the effective communication distance of presetting.
5. radio-frequency unit according to claim 4 is characterized in that:
Said radio-frequency unit also comprises master controller, and said magnetic signal receiver module is used for the electric signal that said first magnetic signal is converted to is sent to said master controller; Electric signal that said master controller is used for being converted to according to first magnetic signal and preset threshold value judge that distance between said radio-frequency unit and the said external radio frequency terminal is whether in the effective communication distance of presetting.
6. radio-frequency unit according to claim 1 is characterized in that: said external radio frequency terminal is a radio-frequency card reader.
7. radio-frequency unit according to claim 1 is characterized in that:
Said radio-frequency unit also comprises pickup coil, and said pickup coil is used to receive first magnetic signal and is converted into electric signal and sends to said magnetic signal receiver module; Said pickup coil also is used to launch said second magnetic signal that said magnetic signal transmitter module produces.
8. radio-frequency unit according to claim 1 is characterized in that:
Said radio-frequency unit also comprises master controller; Said master controller is used to produce the entrained information of second magnetic signal of said magnetic signal transmitter module emission; Said magnetic signal transmitter module is according to the information that said master controller produces, and produces and launches second magnetic signal.
9. radio-frequency unit according to claim 1 is characterized in that:
Said radio-frequency unit also comprises master controller and pickup coil;
Said master controller is connected with said rf data transceiver module, magnetic signal receiver module and magnetic signal transmitter module respectively; Said pickup coil is connected with the magnetic signal transmitter module with said magnetic signal receiver module respectively;
Said master controller is used to produce the entrained information of said second magnetic signal, and this information is sent to said magnetic signal transmitter module; Said master controller also is used for according to first magnetic signal institute electrical signal converted and preset threshold value, judges that distance between said radio-frequency unit and the said external radio frequency terminal is whether in the effective communication distance of presetting;
Said rf data transceiver module is used for carrying out between said radio-frequency unit and the said external radio frequency terminal transmitting-receiving of rf data;
Said magnetic signal receiver module also is used for the electric signal that said first magnetic signal is converted to is sent to said master controller;
Said magnetic signal transmitter module according to the information that said master controller produces, produces and launches second magnetic signal;
Said pickup coil is used to receive first magnetic signal and is converted into electric signal and sends to said magnetic signal receiver module; Said pickup coil also is used to launch said second magnetic signal that said magnetic signal transmitter module produces.
10. according to each described radio-frequency unit of claim 1 to 9, it is characterized in that: said radio-frequency unit is a radio-frequency SIM card.
11., it is characterized in that according to claim 7 or 9 described radio-frequency units:
Said magnetic signal receiver module comprises amplifying circuit, filtering circuit and the decoding circuit that connects in order, and said amplifying circuit is connected with said pickup coil, and said decoding circuit is connected with said master controller;
Said amplifying circuit is used for the electric signal that first magnetic signal that receives from said pickup coil is converted to is amplified;
Said filtering circuit is used for the electric signal after amplifying is carried out filtering, suppresses noise and interference outside the useful signal frequency band range;
Said decoding circuit is decoded to filtered signal according to the coded system that radio-frequency unit adopted of said first magnetic signal of emission, and sends to said master controller.
12. radio-frequency unit according to claim 11 is characterized in that:
Said magnetic signal receiver module also comprises the demodulator circuit that is arranged between filtering circuit and the decoding circuit; Said demodulator circuit is used for according to the modulation system that said external radio frequency terminal is adopted filtered signal being carried out demodulation, and sends to said decoding circuit.
13., it is characterized in that according to claim 7 or 9 described radio-frequency units:
Said magnetic signal receiver module comprises amplifying circuit and the filtering circuit that connects in order, and said amplifying circuit is connected with said pickup coil, and said filtering circuit is connected with said master controller;
Said amplifying circuit is used for the electric signal that first magnetic signal that receives from said pickup coil is converted to is amplified;
Said filtering circuit is used for the electric signal after amplifying is carried out filtering, suppresses noise and interference outside the useful signal frequency band range;
Said master controller also is used for according to the coded system that radio-frequency unit adopted of said first magnetic signal of emission filtered signal being decoded.
14. radio-frequency unit according to claim 13 is characterized in that:
Said magnetic signal receiver module also comprises the demodulator circuit that is arranged between filtering circuit and the master controller; Said demodulator circuit is used for according to the modulation system that said external radio frequency terminal is adopted filtered signal being carried out demodulation, and sends to said master controller.
15., it is characterized in that according to claim 7 or 9 described radio-frequency units:
Said magnetic signal transmitter module comprises coding circuit, D/A change-over circuit and the driving circuit that connects in order, and said coding circuit is connected with said master controller, and said driving circuit is connected with said pickup coil;
Said master controller is used to produce the low frequency magnetic field information that said radio-frequency unit need be launched, and said Magnetic Field is a digital baseband signal;
Said coding circuit is used for the digital baseband signal that said master controller provides is encoded;
Said D/A change-over circuit is used for converting the digital signal behind the coding into low-frequency analog signal;
Said driving circuit is used to amplify said low-frequency analog signal, and drives said pickup coil generation low frequency alternating magnetic field.
16. radio-frequency unit according to claim 15 is characterized in that:
Said magnetic signal transmitter module also comprises the modulation circuit that is arranged between said coding circuit and the D/A change-over circuit; Said modulation circuit is used for the digital baseband signal behind the coding is modulated, and sends to said D/A change-over circuit.
17., it is characterized in that according to claim 7 or 9 described radio-frequency units:
Said magnetic signal transmitter module comprises D/A change-over circuit and the driving circuit that connects in order, and said D/A change-over circuit is connected with said master controller, and said driving circuit is connected with said pickup coil;
Said master controller is used to produce the low frequency coded data, and sends to said D/A change-over circuit;
Said D/A change-over circuit is used for converting said low frequency coded data into low-frequency analog signal;
Said driving circuit is used to amplify said low-frequency analog signal, and drives said pickup coil generation low frequency alternating magnetic field.
18. radio-frequency unit according to claim 17 is characterized in that:
Said magnetic signal transmitter module also comprises the modulation circuit that is arranged between said master controller and the D/A change-over circuit; Said modulation circuit is used for said low frequency coded data is modulated, and sends to said D/A change-over circuit; The modulation system of said modulation circuit adopts the digital modulation mode of no changes in amplitude; The modulation system of said modulation circuit is on-off keying method, frequency shift keying, binary phase shift keying method or QPSK method; The waveform of the carrier signal that said modulation circuit adopts is sine wave, triangular wave or square wave.
19., it is characterized in that according to claim 7 or 9 described radio-frequency units:
Said pickup coil is the multi-thread circle of low frequency receiving cable, low frequencies passage branch usefulness, the unicoil that perhaps share for low frequency receiving cable, low frequencies passage.
20. radio-frequency unit according to claim 19 is characterized in that:
When said pickup coil adopts the unicoil that low frequency receiving cable, low frequencies passage share; Be provided with the simulating signal switch between said unicoil and said low frequency magnetic signal receiver module and the low frequency magnetic signal transmitter module, said simulating signal switch also is connected with said master controller; Said master controller provides switch controlling signal to said simulating signal switch, switches being connected between said low frequency magnetic signal receiver module or low frequency magnetic signal transmitter module and the said unicoil to control said simulating signal switch.
21., it is characterized in that according to each described radio-frequency unit of claim 1 to 9:
The highest predetermined transmitting-receiving frequency of operation of said magnetic signal receiver module and magnetic signal transmitter module is in tonal range, very low frequency (VLF) frequency range or low frequency frequency range.
22. radio-frequency unit according to claim 21 is characterized in that:
The frequency range of said tonal range is 300Hz to 3kHz; The frequency range of said very low frequency (VLF) frequency range is 3kHz to 30kHz; The frequency range of said low frequency frequency range is 30kHz to 300kHz.
23. radio-frequency unit according to claim 21 is characterized in that:
The two-way communication that said magnetic signal receiver module and the magnetic signal transmitter module radio-frequency unit through TDD mode or mode of frequency division duplexing and emission first magnetic signal hangs down frequency link; And the frequency of operation of the frequency of operation of said magnetic signal receiver module and said magnetic signal transmitter module is less than the highest predetermined transmitting-receiving frequency of operation.
24., it is characterized in that according to each described radio-frequency unit of claim 1 to 9:
Said rf data transceiver module comprises RF transceiver, impedance matching network and the radio-frequency antenna that connects in order, and said RF transceiver also is connected with said master controller.
25. radio-frequency unit according to claim 24 is characterized in that:
Said RF transceiver adopts the radio communication mode, and frequency of operation is in very high frequency(VHF) VHF frequency range, superfrequency uhf band or ultrahigh frequency SHF frequency range.
26. radio-frequency unit according to claim 24 is characterized in that:
Said RF transceiver frequency of operation is 433MHz, 915MHz, 2.4GHz or 5.8GHz.
27. radio-frequency unit according to claim 24 is characterized in that:
Said impedance matching network is used to guarantee radiofrequency signal unreflected maximum power transfer on link of launching or receiving.
28. a communication means is characterized in that, comprising:
Be equipped with like the mobile communication terminal of each described radio-frequency unit of claim 1 to 27 and receive first magnetic signal that send at the external radio frequency terminal, and judge said radio-frequency unit and external radio frequency communication between terminals apart from whether in the scope of preset value;
When communication distance was in preset range, said radio-frequency unit sent the low frequency answer signal to said external radio frequency terminal, and and said external radio frequency carry out data communication through radio frequency between eventually;
During aforementioned radio communication, the continual received RF card reader of said radio-frequency unit is sent first magnetic signal, and judges communication distance whether in the scope of preset value, if communication distance not in preset range the time, then stops aforementioned RF data communications.
29. communication means according to claim 28 is characterized in that:
After said mobile communication terminal of equipment and the completion of said external radio frequency communication between terminals, said radio-frequency unit gets into dormant state and waits for communication next time.
30. communication means according to claim 28 is characterized in that:
When communication distance is beyond preset range; Said radio-frequency unit continues attempt to receive first magnetic signal that send at the external radio frequency terminal in first Preset Time, and judge said radio-frequency unit and external radio frequency communication between terminals apart from whether in the scope of preset value.
31. communication means according to claim 30 is characterized in that:
When said radio-frequency unit does not receive first magnetic signal in first Preset Time, then equip the mobile communication terminal disconnection of said radio-frequency unit and being connected of said external radio frequency terminal, said radio-frequency unit gets into dormant state.
32.
Communication means according to claim 28 is characterized in that:
When said radio-frequency unit detects communication distance in preset range the time; Said radio-frequency unit attempts receiving the rf data that send at the external radio frequency terminal in second Preset Time; If in second Preset Time, receive the rf data that send at the external radio frequency terminal; Then and said external radio frequency carry out RF data communications between eventually; If in second Preset Time, do not receive the rf data that send at the external radio frequency terminal, then equip the mobile communication terminal disconnection of said radio-frequency unit and being connected of said external radio frequency terminal, said radio-frequency unit gets into dormant state.
Priority Applications (4)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201110112459.7A CN102768725B (en) | 2011-05-03 | 2011-05-03 | A kind of radio-frequency unit and communication means |
| PCT/CN2012/074390 WO2012149869A1 (en) | 2011-05-03 | 2012-04-19 | Communication method, communication device and communication system |
| US14/162,787 US9400903B2 (en) | 2011-05-03 | 2014-01-24 | Communication method, device, and system |
| US15/186,705 US10019611B2 (en) | 2011-05-03 | 2016-06-20 | Communication device and system |
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| CN201110112459.7A CN102768725B (en) | 2011-05-03 | 2011-05-03 | A kind of radio-frequency unit and communication means |
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| CN102768725B CN102768725B (en) | 2015-12-16 |
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