WO2015035815A1

WO2015035815A1 - Method and system for multiplexing radio-frequency front-end

Info

Publication number: WO2015035815A1
Application number: PCT/CN2014/080544
Authority: WO
Inventors: 林君
Original assignee: 中兴通讯股份有限公司
Priority date: 2013-09-11
Filing date: 2014-06-23
Publication date: 2015-03-19
Also published as: CN104426572A

Abstract

A method and a system for multiplexing a radio-frequency front-end comprises a card reader and a mobile terminal, and the mobile terminal comprises a radio-frequency unit, a multiplexing unit and contact less protocol units, wherein the multiplexing unit distributing an instruction received from the radio-frequency unit to each contact less protocol unit, determining response data thereof and outputting collision data to the radio-frequency unit; the radio-frequency unit receiving and modulating the collision data and using a radio-frequency modulation signal to send the modulated data to the card reader; a plurality of contact less protocol units receiving the card reader instruction distributed by the multiplexing unit, parsing the instruction and sending response data to the multiplexing unit based on a parsing result; and when receiving a radio-frequency modulation signal that cannot be identified, the card reading regenerating a card reading instruction comprising a contact less protocol unit connection identifier and sending it to the multiplexing unit. Thereby, interaction between a user and a terminal in a communication process can be reduced.

Description

The present invention relates to the field of mobile terminals, and in particular, to a radio frequency (RF) front-end multiplexing method and system. BACKGROUND In mobile payment, a mobile terminal often has multiple security modules (SECURITY ENTITY, SE). The structure of the SE in the current mobile terminal is shown in FIG. In this scenario, the mobile terminal has two SEs. When moving the near-distance credit card, since there is no parameter in the application layer data sent from the card reader indicating that it is transmitted to SE A or SE B, only SE A and SE B can only have one job. When making a short-range mobile payment, the user needs to set a working SE on the mobile terminal first, and then conduct the transaction; if the next transaction uses another SE, the user needs to reset the working SE. If the SE A does not contain valid information during the close-range mobile payment process, SE B contains valid information. The user is not sure which SE is currently active. At this time, it is necessary to trade according to the flow of Figure 2.

S001: User setting SE A connects to the contactless protocol unit, SE B disconnects; S002: The mobile terminal is close to the card reader, and the card reader sends commands to the contactless front end (Contact Less

Frontend, CLF);

S003: The CLF sends an application layer instruction to the SE A;

S004: SE A returns response data to the CLF;

S005: The CLF returns the data to the card reader; S006: The application layer data of the SE A response is not the parameter desired by the card reader; the card reader prompts the user to fail

SE A conducts trading;

S007: The user sets the SE B connection non-contact protocol unit to work, and the SE A is disconnected;

S008: the terminal is close to the card reader, and the card reader sends an instruction to the CLF;

S009: The CLF sends an application layer instruction to the SE B; S010: SE B returns response data to CLF;

SOU: CLF returns the data to the reader;

S012: The card reader detects that the SE B contains the information required by the card reader, and then continues to send instructions for further data interaction. In this process, the user selects the working SE on the mobile terminal before the transaction, and the setting does not necessarily guarantee communication, and the use is troublesome. SUMMARY OF THE INVENTION A main object of the embodiments of the present invention is to provide a radio frequency front-end multiplexing method, which solves the problem that a user needs to select a working SE on a mobile terminal before the transaction in the prior art, and the communication may not be guaranteed after the setting. Troublesome technical problems. In order to achieve the object of the present invention, an embodiment of the present invention provides a system for multiplexing a radio frequency front end, including a card reader and a mobile terminal, where the mobile terminal includes a radio frequency unit, a multiplexing unit, and a non-contact protocol unit, where the multiplexing unit, And configured to distribute the instruction received from the radio frequency unit to each non-contact protocol unit, and determine the response data sent by each non-contact protocol unit, and output the collision data when the bits of the plurality of response data participating in the decision are different. To the radio frequency unit; the radio frequency unit is configured to receive and modulate the collision data, send the modulated data to the card reader with the radio frequency modulation signal, and receive the instruction sent by the card reader; a plurality of non-contact protocol units, setting Receiving and interpreting the card reader command distributed by the multiplexing unit, and transmitting the response data to the multiplexing unit according to the parsing result; the card reader is configured to regenerate the inclusion when receiving the unrecognized radio frequency modulation signal The contactless protocol unit connects the reader's card reading instruction to the multiplexing unit . Preferably, the multiplexing unit is further configured to: directly output the original data to the radio frequency unit when there is only one branch for data interaction with the radio frequency front end. Preferably, the radio frequency unit is configured to: when the input data is original data, generate corresponding radio frequency signals according to the IS014443 protocol modulation; When the input data is collision data, a radio frequency modulation signal that cannot be recognized by the card reader is generated. Preferably, the card reader comprises: an anti-collision instruction generating unit configured to generate an anti-collision command and send to the multiplexing unit; the non-contact protocol unit is configured to: parse the received anti-collision command, where The anti-collision instruction sends a response instruction when the information is directed to the unit; the response instruction includes user identification information. Preferably, the anti-collision instruction generating unit is further configured to: detect the received response instruction, and generate an anti-collision instruction corresponding to the plurality of non-contact protocol units according to the user identity certification information information in the response instruction. Preferably, the card reader further comprises: a selection instruction generating unit configured to generate a selection instruction directed to a non-contact protocol unit; the non-contact protocol unit is configured to: detect the received selection instruction, select When the instruction is an instruction directed to the unit, the response instruction is sent. When the instruction is an instruction that is not directed to the unit, the selection instruction is discarded. Preferably, the card reader further comprises: a request selection response instruction generating unit configured to generate a request selection response instruction directed to a non-contact protocol unit; the non-contact protocol unit is configured to: select a response to the received request The instruction detects that the instruction is processed and returns a response message when the request selection response instruction is an instruction directed to the unit, and the request selection response instruction is ignored when the request selection response instruction is an instruction that does not point to the unit. Preferably, the non-contact protocol unit is further configured to: perform frame synchronization and slot synchronization processing on the received data, and send the response data on the processed time slot. The embodiment of the present invention further provides a method for multiplexing a radio frequency front end, including: the multiplexing unit distributing an instruction received from the radio frequency unit to each non-contact protocol unit; The contactless protocol unit receives the distributed card reader command and parses the command, and sends the response data according to the parsing result; the multiplexing unit determines the response data sent by each non-contact protocol unit, and participates in the plurality of response data of the decision. When the bits are different, the collision data is output to the radio frequency unit; the radio frequency unit receives and modulates the collision data, and transmits the modulated data to the card reader by using the radio frequency modulation signal; the card reader receives the unrecognized radio frequency When the signal is modulated, a card reading command containing the contact identifier of the contactless protocol unit is regenerated and output. Preferably, the method further includes: directly outputting data to the radio frequency unit when there is only one branch for data interaction with the radio frequency front end. Preferably, the step of receiving and modulating the collision data comprises: when the input data is original data, modulating according to the IS014443 protocol to generate a corresponding radio frequency signal; when the input data is collision data, the card cannot be read. The RF modulated signal identified by the device. Preferably, when the card reader receives the unrecognized radio frequency modulation signal, the step of regenerating the card reading instruction including the contact protocol unit connection identifier and outputting comprises: generating an anti-collision instruction and transmitting the anti-collision instruction to the multiplexing unit; The non-contact protocol unit is configured to receive the distributed card reader command and parse the command, and the step of transmitting the response data according to the parsing result comprises: parsing the received anti-collision instruction, where the instruction is directed to the unit The response instruction is sent when the information is; the response instruction includes the user identification information. Preferably, the generating the anti-collision instruction comprises: detecting the received response instruction, and generating an anti-collision instruction corresponding to the plurality of non-contact protocol units according to the user identity verification information in the response instruction. Preferably, when the card reader receives the unrecognized radio frequency modulation signal, the step of regenerating the card reading instruction including the contact protocol unit connection identifier and outputting comprises: generating a selection instruction directed to a non-contact protocol unit ; The non-contact protocol unit receives the distributed card reader command and parses the command, and sending the response data according to the parsing result includes: detecting the received selection instruction, and sending the response instruction when the selecting instruction is an instruction directed to the unit When the instruction is an instruction that is not directed to the unit, the selection instruction is discarded. Preferably, when the card reader receives the unrecognized radio frequency modulation signal, regenerating the card reading instruction including the contactless protocol unit connection identifier and outputting comprises: generating a request selection response instruction directed to a non-contact protocol unit The non-contact protocol unit receives the distributed card reader command and parses the command, and sends the response data according to the parsing result, including: detecting the received request selection response command, and requesting the selection response command to point to the unit The instruction processes the instruction and returns a response message, and ignores the request selection response instruction when the request selection response instruction is an instruction that does not point to the unit. Preferably, the contactless protocol unit receives the distributed card reader command and parses the command, and sending the response data according to the parsing result further comprises: performing frame synchronization and time slot synchronization processing on the received data, and processing The response data is sent on the subsequent time slot. In the embodiment of the present invention, by providing a multiplexing unit between the non-contact protocol unit and the radio frequency unit and improving the non-contact protocol unit and the radio frequency unit, multiple non-contact protocol units are multiplexed into the same radio unit, and multiple non-contact units are realized. The protocol unit works independently at the same time and can be activated at the same time. The card reader can perform data transmission by means of rotation and each non-contact protocol unit. Therefore, multiple SEs connected by the contactless protocol unit can work simultaneously, and data can be read simultaneously. The card reader determines the specific SE communication according to the user interaction or the application, thereby reducing the process of user and terminal interaction during the communication process. BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a schematic structural diagram of a radio frequency security module in a conventional mobile terminal; FIG. 2 is a schematic flowchart of radio data interaction between an existing mobile terminal and a card reader; FIG. 3 is a schematic diagram of multiplexing according to an embodiment of the present invention; Schematic diagram of the RF front end; 4 is a schematic diagram of a symbol of a radio frequency signal waveform when two bits of the non-contact protocol unit are the same; FIG. 5 is a schematic diagram of a waveform of a radio frequency signal waveform when the bits of the two non-contact protocol units are different; FIG. 6 is a schematic diagram of the waveform of the radio frequency signal of the two non-contact protocol units; In the embodiment, two non-contact protocol units simultaneously respond to a waveform of a radio frequency signal generated by an Answer To Request A (ATQA) instruction; FIG. 7 is a schematic structural diagram of a card reader according to an embodiment of the present invention; 8 is a waveform diagram of a radio frequency signal generated by two non-contact protocol units simultaneously responding to an anti-collision command; and FIG. 9 is a flow chart of a method for multiplexing a radio frequency front end according to an embodiment of the present invention. The implementation, functional features, and advantages of the present invention will be further described with reference to the accompanying drawings. The specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention. The core idea of the present invention is to provide a multiplexing unit between the contactless protocol unit and the radio frequency unit, receive the card reading instruction sent by the card reader through the multiplexing unit, and distribute it to each non-contact protocol unit to respond to each non-contact protocol unit. The data is judged. When the bits of the plurality of data participating in the decision are different, the collision data is output and output to the radio frequency unit, and outputted to the card reader by the radio frequency unit. After receiving the data of the radio frequency signal that cannot be detected, the card reader generates a card reading instruction including the connection identifier of the contactless protocol unit and sends the card reading instruction to the multiplexing unit to perform a card reading operation on a non-contact protocol unit. Referring to FIG. 3, in an embodiment of the present invention, a system for multiplexing a radio frequency front end includes a card reader 1 and a mobile terminal 2, wherein the mobile terminal 2 has a radio frequency unit 31, a multiplexing unit 32, and a non-contact protocol unit 33. The multiplexing unit 31 is configured to receive the card reading command sent by the card reader and distribute it to each non-contact protocol unit, and determine the response data sent by each non-contact protocol unit, and participate in multiple response data of the decision. When the bits are different, the collision data is output to the radio frequency unit; the radio frequency unit 32 is configured to receive and modulate the collision data, and send the modulated data to the card reader with the radio frequency modulation signal; a plurality of non-contact protocol units 33 And configured to receive the card reader command distributed by the multiplexing unit and parse the instruction, and send the response data to the multiplexing unit according to the parsing result; The card reader 1 is configured to regenerate a card reading command including a contactless protocol unit connection identifier and transmit it to the multiplexing unit upon receiving an unrecognized radio frequency modulation signal. In the embodiment of the present invention, the radio frequency unit 31 is responsible for receiving the RF carrier signal and demodulating and obtaining the data; modulating the data to the subcarrier, then modulating the subcarrier to the radio frequency carrier, and transmitting the signal. If the input data is '0' or ', the corresponding RF signal is generated according to IS014443 modulation. If the input data is the collision data 'Z', a radio frequency modulation signal that cannot be recognized by the card reader is generated. Figure 4 shows the corresponding RF signals with bits '0' and '. Figure 5 shows the RF waveform generated after modulation when the bits are different. It is characterized in that subcarriers cannot be detected on the radio frequency signal or subcarriers are not modulated. The superimposed RF signal is labeled 'Ζ', and the card reader 1 detects that the symbol is different from the other transmitted data (0 and 1), thereby determining that there are multiple cards in the RF field. The multiplexing unit 32 decodes the data received from the radio frequency unit 31 and distributes it to the respective non-contact protocol units 33; and judges the data transmitted from each non-contact protocol unit 33. In an embodiment, the rules of the decision are as follows:

1. When the non-contact protocol unit 33 outputs data, the decision is made. If the data is not output, the decision is not participated; 2. If the bits of the data participating in the decision are the same, the original data is output;

3. If the bits of the data participating in the decision are different, the data 'Ζ' is output;

4. If there is only one branch, the transparent output data bit is output. The multiplexing unit 32 is a functional unit that can be implemented by software and/or hardware. In the embodiment of the present invention, the contactless protocol unit 33 can parse the card reader command to determine whether the command is sent to itself. Each non-contact protocol unit 33 has an independent user ID) (User Identification, UID identifier, UID from a non-contact protocol unit 33 fixed identifier, or from a random number, or from an external interface, each contactless protocol The UID of the unit is different. The contactless protocol unit 33 supports the IS014443-3 protocol, performs frame synchronization and time slot synchronization on the received data, is responsible for protocol processing, receives commands, and sends response commands or data. The contactless protocol unit 33 is connected through an interface and an application. The data exchange is performed by SE, etc. The contactless protocol unit 33 is a functional unit and can be implemented by software and/or hardware to implement an independent function. The plurality of contactless protocol units 33 may be on the same physical unit or not. In the embodiment of the present invention, the plurality of non-contact protocol units 33 operate independently; the multiplexing unit 32 distributes the demodulated data of the radio unit 31 to the non-contact protocol unit 33; if each non-contact protocol unit 33 outputs Data If the bits are different, the collision data is output to the radio frequency unit 31. After the collision data is modulated, the symbols carried by the radio frequency carrier cannot be detected by the card reader. If the card reader 1 prompts the user that there is no support for multiple cards in the radio field, the user can set the working contactless protocol unit 33. Selecting a contactless protocol unit 33 to work, other protocol units stop working; or the card reader initiates only one SE job according to a preset rule. According to the ISO 14443 protocol, the reader can resend the data based on the detected radio frequency signal 'Z', which avoids the superimposed bits. After many such processes, until a card is completely selected and assigned Connection Identifier (CID) information, subsequent instructions can be sent only to the corresponding card. The card reader then initiates a card initialization process for the unselected card. After repeated operations, multiple cards in the same RF field can be selected. Then the card reader 1 can send data to the designated card, the corresponding card receives the data, and the other cards do not send the data, so there is no data collision in this process, so the card reader can receive normally. At this time, the specific communication with the card is completely determined by the card reader 1, and the user does not need to participate. The card reader 1 can completely read some basic information for each card, and then judge which SEs to communicate with based on the basic information. Further, in an embodiment of the present invention, the non-contact protocol unit 33 may be further configured to: perform frame synchronization and slot synchronization processing on the received data, and send the response data on the processed time slot. In the embodiment of the present invention, each non-contact protocol unit 33 can be coordinated by an external controller to work in cooperation, such as stopping work or starting work. If each non-contact protocol unit 33 operates under the control of a common controller, the non-contact protocol unit 33 is after the RF unit of the ISO-14443 Type B type receives the request (Request B, REQB) of the contact protocol unit B. The response data is transmitted on the coordinated time slot to reduce the collision probability. It is assumed that the mobile terminal 2 has two contactless protocol units 33, the contactless protocol unit operates in the Type A mode, the contactless protocol unit 33A and the SE A are connected, and the contactless protocol unit 33B and the SE B are connected. Example 1 describes a flow in which the card reader 1 simultaneously connects two non-contact protocol units 33 with the SE without a user interaction in the system for multiplexing the radio frequency front end of the present invention. Example 1 S101: The card reader 1 turns on the RF field, operates in the Type A mode, and sends a REQA command.

S102: The multiplexing unit 32 distributes the REQA to the contactless protocol unit 33A. S103: The multiplexing unit 32 distributes the REQA to the contactless protocol unit 33B.

S104: The contactless protocol unit 33A detects that the current radio frequency field operates in the same mode as its own working mode according to the modulation mode of the REQA, and then sends the response data ATQA in response to the WUPA (Wake UP A, the wake-up command of the contactless protocol unit A). Where bit6=0; S105: The contactless protocol unit 33B detects that the current RF field operates in the same mode as its own working mode according to the modulation mode of the REQA, and then sends the response data ATQA in response to the WUPA command. Where bit6=l, the other data bits are the same as the data bits sent by the contactless protocol unit 33B.

S106: The multiplexing unit determines the signal and performs the judgment bit by bit. Where bit 6 is different, the collision indication bit 'Z' is generated. The radio unit 31 modulates the data output from the multiplexing unit 32 to the radio frequency subcarrier, and the subcarrier is modulated onto the radio frequency carrier. The 'Z' in Fig. 6 is the waveform of the collision RF signal in this embodiment, which cannot be correctly received. Other symbols can be received correctly. The card reader detected an error in bit6 and considered that the bit collided. It is considered that there are more than two non-contact protocol units 33 in the radio frequency field. Referring to FIG. 7, in an embodiment of the present invention, the card reader 1 includes: an anti-collision instruction generating unit 110, configured to generate an anti-collision ANTICOLLISION command and send it to the multiplexing when the card reader 1 receives the unrecognized radio frequency modulation signal. Unit 32. The contactless protocol unit 33 may parse the received anti-collision ANTICOLLISION instruction, and send a response instruction when the ANTICOLLISION instruction is information directed to the unit; the response instruction includes user identification certificate UID information. Specifically, please refer to the following example 2. Example 2 S201: Card Reader 1 sends the ANTICOLLISION command (0x93 0x20).

S202: The multiplexing unit 32 distributes the ANTICOLLISION to the contactless protocol unit 33A.

S203: The multiplexing unit 32 distributes the ANTICOLLISION to the contactless protocol unit 33B.

S204: The non-contact protocol unit 33A parses the discovery instruction to be sent to itself, and therefore sends a response instruction; the response instruction includes UID information, where byte0=0x08; S205: the non-contact protocol unit 33B parses the discovery instruction to be sent to itself, and therefore sends Response instruction; the response instruction includes UID information, where byte0=0xl 1;

S206: The multiplexing unit 32 performs bit-by-bit bit determination on the input two data, wherein bit3, bit4, and bit7 are different, and a collision indication bit 'Z' is generated. The radio frequency unit 31 modulates the data output by the multiplexing unit 32 to the radio frequency subcarrier, and the subcarrier is modulated onto the radio frequency carrier, wherein the radio frequency signal corresponding to the Z cannot be correctly detected by the PCD (Proximity Coupling Device). In Figure 8, 'Z' is the RF signal waveform of the collision and cannot be received correctly. The card reader 1 correctly detects bit 0-2, and bit 3 cannot be detected correctly. Therefore, it is considered that there are two protocol units in the radio frequency field, and the first 4 bits of the UID identification information are: xxxl and xxx0. In an embodiment of the present invention, the anti-collision instruction generating unit 1 io is further configured to: detect the received response instruction, and generate an ANTICOLLISION instruction corresponding to the plurality of non-contact protocol units 33 according to the UID information in the response instruction. Specifically, please refer to the following example 2. The processing flow of the system is as follows: Example 3

S301: The card reader 1 resends the ANTICOLLISION command with (χχχΟ)Β as a parameter, indicating that the non-contact protocol unit 33 of the UID top 4 bit=(xxx0) B is selected.

S302: The multiplexing unit 32 distributes the ANTICOLLISION to the contactless protocol unit 33A.

S303: The multiplexing unit 32 distributes the ANTICOLLISION to the contactless protocol unit 33B. S304: Non-contact protocol unit 33A check parameter (χχχθ) B is equal to the first 4 bits of UID information

(χχχθ) B, contactless protocol unit 33 A sends response data. The contactless protocol unit 33B checks that the parameter (xxxO)B is not equal to the first 4 bits (xxxl) B of the UID information, and detects that the command is not sent to itself. Therefore the instruction is discarded and no response is made.

S305: The multiplexing unit 32 receives the data sent by the contactless protocol unit 33A, and detects that there is currently only one branch data, and the decider directly outputs the data to the radio frequency unit for modulation and transmission, and all the signals can be correctly decoded by the card reader 1. In an embodiment of the invention, the card reader 1 further includes: a selection command generating unit 111 configured to generate a selection instruction directed to a non-contact protocol unit 33 upon receiving the unrecognized radio frequency modulation signal. The contactless protocol unit 33 is configured to: detect the received selection SELECT instruction, and send a response instruction SAK when the selection instruction is an instruction directed to the unit, and when the selection instruction is an instruction not directed to the unit, the selection instruction is Discard processing. Specifically, please refer to the following example 4. The processing flow of the system is as follows: Example 4

S401: The card reader 1 sends a SELECT command to the contactless protocol unit 33A; S402: the multiplexing unit 32 distributes the received command to the contactless protocol unit 33A;

S403: The multiplexing unit 32 distributes the received instruction to the contactless protocol unit 33B; S404: The contactless protocol unit 33A detects that it is its own instruction, processes the instruction, and transmits the response instruction SAK. Unit B detects that it is not sending its own instructions and discards it.

S405: The multiplexing unit 32 receives the data sent by the contactless protocol unit 33A, detects that there is currently only one branch data, and the decider directly outputs the data to the radio frequency unit 31 for modulation and transmission, and all the signals can be correctly decoded. In an embodiment of the invention, the card reader 1 further includes: a request selection response (RATS) command generating unit 112, configured to generate a RATS command directed to a non-contact protocol unit 33 when receiving an unrecognized radio frequency modulated signal . In this embodiment, the non-contact protocol unit 33 is configured to: detect the received RATS instruction, process the instruction and return the response information when the RATS instruction is an instruction directed to the unit, when the RATS instruction is an instruction not directed to the unit Ignore the RATS instruction. Specifically, please refer to example 5. The processing flow of the system is as follows: Example 5

S501: The card reader 1 sends a RATS command to the contactless protocol unit 33A, and assigns identification information CID1 thereto;

S502: The multiplexing unit 32 distributes the received instruction to the contactless protocol unit 33A; S503: the multiplexing unit 32 distributes the received instruction to the contactless protocol unit 33B;

S504: The contactless protocol unit 33A detects that the instruction is sent to itself, processes the instruction, and returns the response information. The contactless protocol unit 33B processes the instruction, finds that it is not an instruction for itself, ignores the instruction, and does not respond.

S505: The multiplexing unit 32 receives the data sent by the contactless protocol unit 33A, detects that there is currently only one branch data, and the decider directly outputs the data to the radio frequency unit 31 for modulation and transmission, and all the signals can be correctly decoded. At this time, the non-contact protocol unit 33 A is activated, and data transmission is possible. The above embodiment describes the data interaction process of the contactless protocol unit 33A. For the contactless protocol unit 33B, the process flow of the present invention refers to the following examples 6 to 8. Example 6 S601: The card reader 1 resends the ANTICOLLISION command, with Cxxxl as a parameter, indicating that the protocol unit of the top 4 bits of the UID = (xxxl) B is selected. S602: The multiplexing unit 32 distributes the ANTICOLLISION to the contactless protocol unit 33A.

S603: The multiplexing unit 32 distributes the ANTICOLLISION to the contactless protocol unit 33B.

S604: The contactless protocol unit 33A is in an active state, ignoring the command; the contactless protocol unit 33B checks that the parameter carried by the ANTICOLLISION command is (xxxO) B, which is equal to the first 4 bits (xxxO) of the UID information, and the command is detected to be Send to yourself, respond to the command.

S605: The multiplexing unit 32 receives the data sent by the contactless protocol unit 33B, detects that there is currently only one branch data, and the decider directly outputs the data to the radio frequency unit 31 for modulation and transmission, and all the signals can be correctly decoded. Example 7 S701: The card reader 1 sends a SELECT command to the contactless protocol unit 33B, and sends it;

S702: The multiplexing unit 32 distributes the received instruction to the contactless protocol unit 33A;

S703: The multiplexing unit 32 distributes the received instruction to the contactless protocol unit 33B;

S704: The contactless protocol unit 33B detects that it is its own instruction, processes the instruction, and sends a response instruction SAK. The contactless protocol unit 33A detects that it is not sending its own signal and discards it. S705: The multiplexing unit 32 receives the data sent by the contactless protocol unit 33B, detects that there is currently only one branch data, and the decider directly outputs the data to the radio frequency unit 31 for modulation and transmission, and all the signals can be correctly decoded. Example eight

S801: The card reader 1 sends a RATS command to the contactless protocol unit 33A, which is assigned identification information CID2; S802: The multiplexing unit 32 distributes the received command to the contactless protocol unit 33A;

S803: The multiplexing unit 32 distributes the received instruction to the contactless protocol unit 33B;

S804: The contactless protocol unit 33A processes the instruction, finds that the instruction is not given to itself, ignores the instruction, and does not respond. The contactless protocol unit 33B detects that the instruction is issued to itself, processes the instruction, and returns response information. S805: The multiplexing unit 32 receives the data sent by the contactless protocol unit 33B, detects that there is currently only one branch data, and the decider directly outputs the data to the radio frequency unit 31 for modulation and transmission, and all the signals can be correctly decoded. At this time, the non-contact protocol unit 33B is activated, and data transmission is possible. Since both contactless protocol units 33 are in an active state, the card reader 1 can transmit data to any of the non-contact contact protocol units, and the card reader 1 transmits the two protocol units to the contactless protocol unit A and the contactless protocol unit B. The instruction contains a parameter CID indicating that the instruction is sent to the contactless protocol unit 33, and only one non-contact protocol unit 33 sends the response command, so that it can be correctly received by the card reader 1. The contactless protocol unit 33 then transmits the data to the corresponding SE, thus enabling communication between the card reader 1 and the SE. Since the card reader 1 can communicate with two SEs, the user does not need to set the external device such as the SE connected to the protocol processing unit or the protocol processing unit, which greatly facilitates the user's use. It should be noted that, in the above examples, S101 to S805 are only process step numbers, and have no other meanings. The present invention further provides a method for multiplexing a radio frequency front end, which method can be implemented based on the foregoing system for multiplexing a radio frequency front end. Referring to FIG. 9, in an embodiment of the present invention, a method for multiplexing a radio frequency front end includes the following steps: Step S10: A multiplexing unit receives a card reading instruction sent by a card reader and distributes the information to each non-contact protocol unit; for example, a multiplexing unit The data received from the radio frequency unit 31 is decoded and distributed to the respective non-contact protocol units 33. Step S20, the contactless protocol unit receives the distributed card reader command and parses the command, and transmits the response data according to the parsing result; for example, the contactless protocol unit 33 parses whether the card reader command is sent to itself. Step S30, the multiplexing unit determines the response data sent by each contactless protocol unit, and outputs the collision data to the radio frequency unit when the bits of the plurality of response data participating in the decision are different; for example, the multiplexing unit 32 pairs each The response data transmitted by the contact protocol unit 33 is subjected to a bitwise decision to determine whether the bits are different. Step S40, the radio frequency unit receives and modulates the collision data, and transmits the modulated data to the card reader by using the radio frequency modulation signal; for example, if the bits of the data output by each non-contact protocol unit 33 are different, multiplexing The unit 32 outputs the collision data to the RF unit 31. After the collision data is modulated by the RF unit 31, the symbols carried by the RF carrier cannot be detected by the card reader. Step S50: When receiving the unrecognized radio frequency modulation signal, the card reader regenerates the card reading instruction including the contact protocol unit connection identifier and outputs the card reading instruction. For example, upon receiving an unrecognized RF modulated signal, the card reader 1 prompts the user to be unable to support the presence of multiple cards in the RF field. If the reader 1 prompts the user to fail to support the RF If there are multiple cards in the field, the user can set the working contactless protocol unit 33. Selecting a contactless protocol unit 33 to work, other protocol units stop working; or the card reader initiates only one SE job according to a preset rule. In an embodiment, the method further includes the following steps: directly outputting data to the radio frequency unit when there is only one branch for data interaction with the radio frequency front end. Further, in an embodiment, the step S40 includes: when the input data is original data, the corresponding radio frequency signal is generated according to the IS014443 protocol; when the input data is collision data, the identifier is not recognized by the card reader. RF modulated signal. Specifically, the waveform of the radio frequency modulation signal that cannot be recognized by the card reader can be referred to FIG. 6 and FIG. 8.

In an embodiment, the step S50 includes: generating an anti-collision ANTICOLLISION command and transmitting the anti-collision ANTICOLLISION command to the multiplexing unit when the card reader receives the unrecognized radio frequency modulation signal; correspondingly, the step S20 includes: receiving the anti-collision The ANTICOLLISION instruction parses, and sends a response instruction when the ANTICOLLISION instruction is information pointing to the unit; the response instruction includes

UID information. For the processing flow of this embodiment, reference may be made to the above example 1. Further, the foregoing step S50 may further include: detecting the received response instruction, and generating an ANTICOLLISION instruction corresponding to the plurality of contactless protocol units according to the UID information in the response instruction. For the processing flow of this embodiment, reference may be made to the above example 2. In another embodiment, the foregoing step S50 may include: when receiving an unrecognized radio frequency modulation signal, generating a SELECT instruction directed to a non-contact protocol unit. Correspondingly, the above step S20 includes: The received SELECT command is detected, and the response command SAK is sent when the SELECT instruction is an instruction directed to the unit, and the SELECT instruction is discarded when the SELECT instruction is an instruction not directed to the unit. For the processing flow of this embodiment, reference may be made to the above example 3.

In a further embodiment, the step S50 includes: generating a request selection response instruction directed to a non-contact protocol unit; correspondingly, the foregoing step S20 includes: detecting the received RATS instruction, where the RATS instruction is directed to the unit The instruction processing instruction and returning the response information, and the RATS instruction is ignored when the RATS instruction is an instruction that does not point to the unit. For the processing flow of this embodiment, reference may be made to the above example four. The above step S20 may further include: performing frame synchronization and slot synchronization processing on the received data, and transmitting the response data on the processed time slot. In the embodiment of the present invention, each of the non-contact protocol units 33 may be coordinated by an external controller to work in cooperation, such as stopping work or starting work. If each non-contact protocol unit 33 operates under the control of a common controller, after the RF unit of the working ISO-14443 Type B type receives the REQB command, the non-contact protocol unit 33 transmits the response data on the coordinated time slot to Reduce the probability of collision. The above are only the preferred embodiments of the present invention, and are not intended to limit the scope of the invention, and the equivalent structure or equivalent process transformations made by the description of the present invention and the drawings are used directly or indirectly in other related technical fields. The same is included in the scope of patent protection of the present invention. INDUSTRIAL APPLICABILITY The above technical solution provided by the present invention can be applied to an application process of multiplexing a radio frequency front end, by providing a multiplexing unit between the non-contact protocol unit and the radio frequency unit, and improving the non-contact protocol unit and the radio frequency unit, A plurality of non-contact protocol units are multiplexed to the same radio unit, and the plurality of non-contact protocol units work independently at the same time, and can be activated at the same time, and the card reader can perform data transmission by means of rotation and each non-contact protocol unit. Therefore, multiple SEs connected by the contactless protocol unit can work simultaneously, and data can be read simultaneously. The card reader decides to communicate with the specific SE according to user interaction or application, thereby reducing the process of user and terminal interaction during communication.

Claims

The invention provides a system for multiplexing a radio frequency front end, comprising a card reader and a mobile terminal, wherein the mobile terminal comprises a radio frequency unit, a multiplexing unit and a non-contact protocol unit, and the multiplexing unit is configured as a slave radio unit The received command is distributed to each contactless protocol unit, and the response data sent by each contactless protocol unit is determined, and when the bits of the plurality of response data participating in the decision are different, the collision data is output to the radio frequency unit;

The radio frequency unit is configured to receive and modulate the collision data, send the modulated data to the card reader with the radio frequency modulation signal, and receive the instruction sent by the card reader;

The plurality of contactless protocol units are configured to receive the card reader command distributed by the multiplexing unit and parse the command, and send the response data to the multiplexing unit according to the parsing result; the card reader is set to be unrecognized after receiving When the radio frequency modulates the signal, the card reading instruction including the non-contact protocol unit connection identifier is regenerated and sent to the multiplexing unit. The system for multiplexing a radio frequency front end according to claim 1, wherein the multiplexing unit is further configured to: directly output the original data to the radio frequency unit when there is only one branch for data interaction with the radio frequency front end. The system for multiplexing a radio frequency front end according to claim 2, wherein the radio frequency unit is specifically configured to: when the input data is original data, generate a corresponding radio frequency signal according to the IS014443 protocol modulation;

When the input data is collision data, a radio frequency modulation signal that cannot be recognized by the card reader is generated. The system for multiplexing a radio frequency front end according to claim 3, wherein the card reader comprises: an anti-collision command generating unit configured to generate an anti-collision command and send to the multiplexing unit; the non-contact protocol unit setting The method is: parsing the received anti-collision instruction, and sending a response instruction when the anti-collision instruction is information pointing to the unit; the response instruction includes user identity information. The system for multiplexing a radio frequency front end according to claim 1, wherein the anti-collision instruction generating unit is further configured to: detect the received response instruction, and generate a corresponding location according to the user identity verification information in the response instruction. Anti-collision instructions for a number of contactless protocol units. The system for multiplexing a radio frequency front end according to claim 1, wherein the card reader further comprises: a selection instruction generating unit configured to generate a selection instruction directed to a non-contact protocol unit; the non-contact protocol unit Set as:

The received selection instruction is detected, and the response instruction is sent when the selection instruction is an instruction directed to the unit, and the selection instruction is discarded when the selection instruction is an instruction not directed to the unit. The system for multiplexing a radio frequency front end according to claim 1, wherein the card reader further comprises: a request selection response command generating unit configured to generate a request selection response command directed to a non-contact protocol unit;

The contactless protocol unit is set to:

The received request selection response command is detected. When the request selection response command is an instruction directed to the unit, the instruction is processed and the response information is returned. When the request selection response command is an instruction not directed to the unit, the request selection response command is ignored. The system for multiplexing a radio frequency front end according to any one of claims 1 to 7, wherein the non-contact protocol unit is further configured to: perform frame synchronization and time slot synchronization processing on the received data, and The response data is transmitted on the processed time slot. A method of multiplexing a radio frequency front end, comprising:

The multiplexing unit distributes the instructions received from the radio frequency unit to the non-contact protocol units; the non-contact protocol unit receives the distributed card reader command and parses the command, and sends the response data according to the parsing result; The response data sent by the contact protocol unit is determined, and when the bits of the plurality of response data participating in the decision are different, the collision data is output to the radio frequency unit; the radio frequency unit receives and modulates the collision data, and uses the modulated data. The RF modulated signal is sent to the card reader; when receiving the unrecognized RF modulated signal, the card reader regenerates the card reading command including the contact identifier of the contactless protocol unit and outputs it. The method of multiplexing a radio frequency front end according to claim 9, further comprising: directly outputting data to the radio frequency unit when there is only one branch for data interaction with the radio frequency front end. The method of multiplexing a radio frequency front end according to claim 10, wherein the receiving and modulating the collision data comprises:

When the input data is original data, the corresponding RF signal is generated according to the IS014443 protocol modulation;

When the input data is collision data, a radio frequency modulation signal that cannot be recognized by the card reader is generated. The method for multiplexing a radio frequency front end according to claim 9, wherein the card reader regenerates a card reading command including a contactless protocol unit connection identifier when the unreadable radio frequency modulation signal is received, and the output includes: Generating an anti-collision instruction and transmitting the anti-collision instruction to the multiplexing unit; the non-contact protocol unit receives the distributed card reader instruction and parses the instruction, and the step of transmitting the response data according to the parsing result comprises: parsing the received anti-collision instruction And sending a response instruction when the anti-collision instruction is information pointing to the unit; the response instruction includes user identity information. The method of multiplexing the radio frequency front end according to claim 12, wherein the generating the anti-collision instruction comprises: detecting the received response instruction, and generating, according to the user identity certification information in the response instruction, the corresponding non-contact Anti-collision instructions for protocol units. The method for multiplexing a radio frequency front end according to claim 9, wherein the card reader regenerates a card reading command including a contactless protocol unit connection identifier when the unreadable radio frequency modulation signal is received, and the output includes: Generating a selection instruction directed to a contactless protocol unit;

The non-contact protocol unit receives the distributed card reader command and parses the command, and the step of transmitting the response data according to the parsing result includes: detecting the received selection instruction, and sending when the selecting instruction is an instruction directed to the unit In response to the instruction, when the selection instruction is an instruction that is not directed to the unit, the selection instruction is discarded. The method for multiplexing a radio frequency front end according to claim 9, wherein the card reader regenerates a card reading command including a contactless protocol unit connection identifier when the unreadable radio frequency modulation signal is received, and the output includes: Generating a request selection response instruction directed to a contactless protocol unit; The non-contact protocol unit receives the distributed card reader command and parses the command, and the step of transmitting the response data according to the parsing result includes: detecting the received request selection response command, and requesting the selection response command to point to the unit The instruction processing instruction returns a response message, and ignores the request selection response instruction when the request selection response instruction is an instruction that does not point to the unit. The method for multiplexing a radio frequency front end according to any one of claims 9 to 15, wherein the non-contact protocol unit receives the distributed card reader command and parses the command, and the sending the response data according to the parsing result further includes:

The received data is subjected to frame synchronization and slot synchronization processing, and the response data is transmitted on the processed time slot.