WO2009109075A1

WO2009109075A1 - A device and a method for adjusting communication distance of a radio sim card

Info

Publication number: WO2009109075A1
Application number: PCT/CN2008/001789
Authority: WO
Inventors: 王仁发; 余运波; 朱杉
Original assignee: 深圳市中兴集成电路设计有限责任公司
Priority date: 2008-03-04
Filing date: 2008-10-23
Publication date: 2009-09-11
Also published as: CN101330334A; CN101330334B

Abstract

A device and a method for adjusting the communication distance of a radio SIM card, the said device comprises: a micro-controller MCU(200), a radio emitting and receiving modem (201), a radio power detecting module (202), an A/D converter (203) and a radio antenna. The said method comprises steps: setting an adjusting value on the radio power adjusting device; the radio power adjusting device sends a command to the radio SIM card and receives the power sent by the radio SIM card, and compares the power with the set adjusting value; the radio power adjusting device sends a relevant command to the radio SIM card for increasing or decreasing the power sent by the radio SIM card, until it is equivalent to the adjusting value entirely. Using the adjusting method of the invention , it can eliminate the different shielding influence generated by the mobile terminal for the radio SIM card signal, and enable the different mobile terminals have the same distance of reading card.

Description

Device and method for calibrating communication distance of radio frequency SIM card

Technical field

Field of the Invention This invention relates to record carriers for use with machines, and more particularly to record carriers with semiconductor circuit components, and more particularly to apparatus and methods for calibrating the communication distance of a radio frequency SIM card. Background technique

With the development of technology, various intelligent circuit modules can be added to SIM (Subscriber Identity Model) cards in ordinary mobile phones (hereinafter referred to as "mobile phones") in various ways, in addition to basic SIM card functions. There are other features that are closer to life. By transforming the mobile phone SIM card into a mobile phone SIM card with payment function, the mobile phone can also have various functions such as credit card, micropayment, attendance and the like. The radio frequency SIM card involved in the present invention is a mobile phone card having these functions, and is a mobile phone smart card with radio frequency wireless communication function after modifying a normal mobile phone SIM card. The mobile smart card not only has all the functions of the conventional SIM card, but also has an interface for short-distance two-way data communication with other external processing devices. With the interface and the original data processing and storage function of the smart card, the mobile phone can have both functions such as Card functions such as credit card, micro payment card, time card, etc., and the information generated during the card process can be directly seen on the cardholder's mobile phone screen, and the cardholder needs to complete the various items through the mobile phone keyboard. operating.

The radio frequency SIM (Subscriber Identity Model) card of the present invention comprises a card body and a circuit in the card body; the card body is provided with an interface that can be matched with the mobile phone card holder, and the card circuit includes a CPU, a memory, and a radio frequency transceiver circuit. , RF transceiver antenna, the entire circuit is connected to the corresponding end of the interface. In this way, the whole circuit can start to work by first obtaining power from the mobile phone. Next, under the control of the CPU, the entire circuit can communicate with the mobile phone to realize the standard functions of the conventional SIM, and can also pass the RF transceiver circuit and the RF transceiver antenna. Communicate with the supporting peripheral processing device within a short distance. The communication content and process are specifically processed by the CPU in the card. If necessary, the CPU sends a command to the mobile phone through the data line on the SIM card holder of the mobile phone and uses a standard protocol to control the screen display of the mobile phone. keyboard input.

The memory referred to herein may also be included in the CPU to make the CPU and the memory an integral part; the memory in the card circuit stores an IMSI (international Mobile Subscriber Identification Number), and may also store other applications. The required information, so that it has the basic SIM card function, can also double as other function cards; the RF transceiver antenna is a loop antenna or a dipole antenna or a spiral antenna or a whip antenna; The function of the mobile phone smart card in the mobile phone is running software The APDU protocol communicates with the mobile phone to control and use the screen, keyboard and other resources of the mobile phone through the STK (SIM card Tool Kit) function of the mobile phone.

However, as mobile communication terminals such as mobile phones have gradually become mobile payment tools with consumer functions such as electronic wallets and mobile phone access control, in real life, higher control is also required for the control of mobile terminal reading distances such as mobile phones. In order to avoid misreading card operations and misreading card operations, it is necessary to limit the distance from the card reader when the mobile terminal such as a mobile phone reads a card, and the card reading operation can be performed only at a certain distance.

These applications are all short-range communication. For mobile terminals such as mobile phones, the shielding effect of signals is different due to the structure and materials used in the housing, especially for RF or higher frequency signals. Especially obvious. Thus, for the same card reader or other device, different mobile terminals, such as mobile phones, may have different communication distances, which may cause erroneous card reading operations, such as mobile phone A reading distance with good signal shielding effect. Closer, and the mobile phone B with poor signal shielding effect is far away from the card reader, and when the two mobile phones are close to the card reader at the same time (the mobile phone A is close to the card reader, the mobile phone B is far away from the card reader), at this time If the card reader is outside the card reading operation distance of the mobile phone A, and within the reading distance of the mobile phone B, the actual operation is that the mobile phone B is performing the card reading operation, and it is considered that the distance should be the distance. The recent mobile phone A is contrary to the phenomenon of reading the card; another example is that, for the mobile phone B in the above example, since the card reading distance is relatively long, when it passes near the card reader but does not need to read the card operation, Produces the behavior of a card reading operation, which results in an erroneous card reading operation.

In the current RF SIM card products, there is a big gap in the communication distance between different mobile phones. The communication distance between the mobile phone with poor shielding effect and the card reader can reach about 1 meter, and for the mobile phone with good shielding effect, even the mobile phone. It is close to the reader and cannot communicate with each other.

The radio frequency SIM card according to the present invention is a SIM card applied to a mobile terminal such as a mobile phone, which works in a radio frequency band or even a higher frequency band, and is capable of performing communication and payment functions, and is based on an existing mobile phone SIM card. On the other, additional functions such as wireless payment, access control and attendance have been added.

Based on the above, it is important to calibrate the communication distance between the card reader and the radio frequency SIM card built into the mobile terminal to maintain the same card reading distance for different mobile terminals.

The card reading method described above has the following disadvantages:

1. For the same card reader or other device, different mobile terminals such as mobile phones may have different communication distances, which may cause incorrect card reading;

2. Due to different shielding effects of different mobile phone terminals, the mobile phone card and the card reader are affected. Summary of the invention

The technical problem to be solved by the present invention is to avoid the above-mentioned deficiencies of the prior art and to provide an apparatus and method for calibrating the short-range wireless communication distance of a radio frequency SIM card.

The invention utilizes a radio frequency power calibration device to compare the value of the radio frequency SIM card in the mobile terminal with the calibration value set in the radio frequency power calibrator, and if the detected value is inconsistent with the calibration value, The power calibration device sends an instruction to request the radio frequency SIM card to change the transmit power until the requirements are met.

Through such a calibration, the transmission power of the radio frequency SIM card in different mobile phones is adjusted to be different, but the power when reaching the card reader is the same or the power is the same when the surface of the mobile phone is the same, thus achieving the solution. The purpose of the problem.

The technical problem of the present invention can be achieved by adopting the following technical solutions: a radio frequency power calibration device for calibrating the communication distance of a radio frequency SIM card, including a microcontroller MCU, a radio frequency transmitting and receiving modem, a radio frequency power detecting module, and an analog to digital conversion And RF antennas.

The RF antenna of the microcontroller is electrically connected to the RF power detection module and the RF transmitting and receiving modem respectively; the RF power detection module is electrically connected to the analog-to-digital converter; the analog-to-digital converter and the corresponding port of the microcontroller MCU are The bus is electrically connected; the RF transmitting and receiving modem and the corresponding port of the microcontroller MCU are electrically connected through the bus.

The instruction of the microcontroller MCU is modulated by the radio frequency transmitting and receiving modem into a radio frequency signal and then transmitted through the radio frequency antenna; the radio frequency power detecting module converts the radio frequency signal received from the radio frequency antenna into an analog voltage signal; the analog to digital converter The analog signal is converted into a digital signal and transmitted to the microcontroller MCU for comparison processing, and the relevant command is sent according to the comparison result to control the radio frequency SIM card to increase or decrease the transmission power to achieve the communication distance of the calibration SIM card.

The RF power calibration device has the same operating frequency as the RF SIM card.

The radio frequency power calibration device has the same communication protocol as the radio frequency SIM card device, and is capable of data exchange with each other.

The microcontroller MCU converts the command data through a radio frequency transmitting and receiving modem and transmits it to the radio frequency antenna.

The RF power detection module is configured to detect a power intensity of an external RF signal and convert it into an analog voltage signal; the analog to digital converter converts the analog voltage signal into a digital signal; the microcontroller MCU will Digital signals are processed.

The present invention solves the technical problem described above, and can further implement the following technical solutions, and a calibration The method for communicating the distance of the radio frequency SIM card is based on creating a radio frequency power calibration device for calibrating the communication distance of the radio frequency SIM card, and the method includes the following steps in sequence:

A. setting a calibration value for comparison in the RF power calibration device;

B. placing a mobile terminal with a built-in radio frequency SIM card in a pseudo positioning position in the sensing area of the radio frequency power calibration device;

C. The RF power calibration device sends an instruction to the RF SIM card, and the RF SIM card receives the command of the power calibration device, and continuously transmits power;

D. The RF power calibration device detects the power transmitted by the RF SIM card and performs correlation calculation to convert into a voltage value. B. Determine whether the RF power calibration device determines whether the operation result in Step D is greater than or equal to the calibration value described in Step A. If the judgment result is "No", that is, the operation result is smaller than the calibration value, the RF power calibrator sends an instruction to the RF SIM card, increases the RF SIM card transmission power, and returns to the execution step D.

F. In the above step B, if the judgment result is "Yes", that is, the operation result is greater than or equal to the set value, it is further determined whether the operation result is greater than or equal to the calibration value, and if it is determined that the calculation result is greater than the calibration value, the RF power calibrator Sending an instruction to the radio frequency SIM card, reducing the radio frequency SIM card transmission power, and returning to step D;

G. In step F, if it is determined that the calculation result is equal to the calibration value, it indicates that the radio frequency SIM card satisfies the power transmission requirement, and the process of calibrating the short-range wireless communication distance of the radio frequency SIM card is completed.

The method works in the SHF band, the VHF band or the UHF ultra-high band.

When the method controls the transmission power of different radio frequency SIM cards to match the calibration value of the radio frequency power calibration device, different mobile terminals with built-in radio frequency SIM cards must be placed in the sensing area described in step B. The same assumed position.

The calibration value in the RF power calibration device described in step A can be changed.

Compared with the prior art, the above technical solutions used in the present invention have the following beneficial effects:

1. By controlling the transmit power of the radio frequency SIM card, the influence of the signal shielding difference of the mobile terminal on the radio frequency SIM card can be eliminated;

2. By controlling the transmit power of the RF SIM card, different mobile terminals have the same card reading distance. DRAWINGS

1 is a working principle diagram of a method for calibrating a communication distance of a radio frequency SIM card according to the present invention;

2 is an internal logic block diagram of a radio frequency power calibration apparatus; 3 is a flow chart showing the operation of the method for calibrating the communication distance of the radio frequency SIM card of the present invention. detailed description

The following is a further detailed description in conjunction with the preferred embodiments shown in the drawings.

As shown in FIG. ² , the apparatus includes a microcontroller MCU 200, a radio frequency transmitting and receiving modem 201, and a radio frequency power detecting module 202, which is a radio frequency power calibration apparatus 100 for calibrating a radio frequency SIM card 104. Analog to digital converter 203 and radio frequency antenna 204. As shown in FIG. 2, the microcontroller radio frequency antenna 204 is electrically connected to the radio frequency power detecting module 202 and the radio frequency transmitting and receiving modem 201, respectively; the radio frequency power detecting module 202 is electrically connected to the analog to digital converter 203; The digital converter 203 is electrically connected to the corresponding port of the microcontroller MCU 200 via a bus; the corresponding port of the RF transmitting and receiving modem 201 and the microcontroller MCU 200 is electrically connected through the bus.

The instruction of the microcontroller MCU 200 is modulated into a radio frequency signal by the radio frequency transmitting and receiving modem 201 and then transmitted through the radio frequency antenna 204. The radio frequency power detecting module 2 G2 converts the radio frequency signal received from the radio frequency antenna 201 into an analog voltage signal. The analog-to-digital converter 203 converts the analog signal into a digital signal and transmits it to the microcontroller MCU 200 for comparison processing, and sends a relevant command according to the comparison result to control the radio frequency SIM card 104 to increase or decrease the transmission power to implement calibration of the SIM card. Communication distance.

As shown in FIG. 2, the RF power calibration device 100 has the same operating frequency as the RF SIM card 104. The RF power calibration device 100 and the RF SIM card 104 device have the same communication protocol and are capable of data exchange with each other.

As shown in FIG. 2, the microcontroller MCU 200 converts the command data through the RF transmitting and receiving modem 201 and transmits it to the RF antenna 204. The RF power detecting module 202 is configured to detect the power intensity of the external RF signal. Converting it to an analog voltage signal; the analog to digital converter 203 converts the analog voltage signal into a digital signal; the microcontroller MCU 200 processes the digital signal.

The working principle diagram of the radio frequency power calibration apparatus 100 when controlling the transmission power of the radio frequency SIM card 104 can refer to FIG. 1. The radio frequency power detection module 202 in the radio frequency power calibration apparatus 100 detects the power transmitted from the radio frequency SIM card 104, and then performs correlation. Processing, and transmitting the relevant operation instruction to the radio frequency SIM card 104 through the microcontroller MCU 200, to implement the transmission power control of the radio frequency SIM card 104.

In order to solve the technical problem of the present invention, the technical solution may further provide a method for calibrating the short-range wireless communication distance of the radio frequency SIM card 104, based on creating a communication distance of the calibration radio frequency IM card 104. The RF power calibration apparatus 100, the method comprising the following steps, as shown in FIG. 3:

A. Setting a calibration value for comparison in the RF power calibration device 100;

B. The mobile terminal 102 with the built-in RF SIM card 104 is placed in an assumed position in the sensing area of the RF power calibration apparatus 100;

C. As shown in step 301 and step 302 of FIG. 3, the radio frequency power calibration apparatus 100 sends an instruction to the radio frequency SIM card 104, and the radio frequency SIM card 104 receives the instruction of the power calibration apparatus 100 to continuously transmit power.

D. As shown in step 303 of FIG. 3, the radio frequency power calibration apparatus 100 detects the power transmitted by the radio frequency SIM card 104, and performs correlation calculation to convert into a voltage value, and performs the next step;

E. As shown in step 304 of FIG. 3, it is determined whether the operation result in the radio frequency power calibration apparatus 100 is greater than or equal to the calibration value described in step A. If the determination result is "NO", the operation result is less than the calibration value, and the radio frequency power is The calibrator 100 sends an instruction to the radio frequency SIM card 104 to increase the transmit power of the radio frequency SIM card 104 and returns to step D.

F, as shown in step 305 of FIG. 3, in the above step E, if the determination result is "Yes", that is, the operation result is greater than or equal to the set value, it is further determined whether the operation result is greater than or equal to the calibration value, and if it is determined as the operation result Greater than the calibration value, the RF power calibrator 100 sends an instruction to the radio frequency SIM card 104, reducing the radio frequency SIM card 104 transmit power, and returns to step D;

G, as shown in step 305 of FIG. 3, in step F, if the determination is "NO", the operation result is equal to the calibration value, indicating that the radio frequency SIM card 104 satisfies the power transmission requirement, and the short-range wireless communication distance of the radio frequency SIM card 104 is completed. process.

The method works in the SHF band, the VHF band or the UHF ultra-high band.

The method is to calibrate the short-range wireless communication distance of the radio frequency SIM card 104, and the different mobile terminals 102 with the built-in radio frequency SIM card 104 must be placed in the same assumed position in the sensing area described in step B, by the present invention. The method for calibrating the short-range wireless communication distance of the radio frequency SIM card 104 is such that when the radio frequency SIM card 104 in different mobile phones is at the same distance from the sensing area of the card reader, the power when reaching the card reader is the same or The power on the surface of the phone is the same, so that different phones maintain the same card reading distance.

The calibration value in the RF power calibration device 100 described in step A can be changed.

Claims

The invention provides a radio frequency power calibration device (100) for calibrating a communication distance of a radio frequency SIM card (104), which comprises a microcontroller MCU (200), a radio frequency transmitting and receiving modem (201), and radio frequency power detection. Module (202), analog to digital converter (203) and radio frequency antenna (204).

The radio frequency antenna (204) is electrically connected to the radio frequency power detecting module (202) and the radio frequency transmitting and receiving modem (201); the power detecting module (202) is electrically connected to the analog to digital converter (203); The digital converter (203) and the corresponding port of the microcontroller MCU (200) are electrically connected through the bus; the RF transmitting and receiving modem (201) and the corresponding port of the microcontroller MCU (200) are electrically connected through the bus.

The instruction of the microcontroller MCU (200) is modulated into a radio frequency signal by a radio frequency transmitting and receiving modem (201) and then transmitted through a radio frequency antenna (204); the radio frequency power detecting module (202) will be an RF antenna (201) The received RF signal is converted into an analog voltage signal; the analog-to-digital converter (203) converts the analog signal into a digital signal and transmits it to the microcontroller MCU (200) for comparison processing, and sends a relevant command to control the RF SIM card according to the comparison result ( 104) Increase or decrease the transmission power to achieve the communication distance of the calibration SIM card.

The radio frequency power calibration apparatus (100) for calibrating a communication distance of a radio frequency SIM card (104) according to claim 1, wherein:

The RF power calibration device (100) operates at the same frequency as the RF SIM card (104).

The RF power calibration device for calibrating the communication distance of the radio frequency SIM card (104) according to claim 1

(100), which is characterized by:

The radio frequency power calibration device (100) has the same communication protocol as the radio frequency SIM card (104) device, and is capable of data exchange with each other.

RF power calibration device for calibrating the communication distance of the RF SIM card (104) as described in claim 1

(100), which is characterized by:

The microcontroller MCU (200) modulates the command data through the RF transmit and receive modem (OR) and transmits it to the RF antenna (204).

(100), which is characterized by:

The RF power detection module (202) is configured to detect the power intensity of an external RF signal and turn it Switching to an analog voltage signal; the analog to digital converter (203) converting the analog voltage signal into a digital signal; the microcontroller MCU (200) processes the digital signal.

A method for calibrating a communication distance of a radio frequency SIM card (104) based on creating a radio frequency power calibration device (100) for calibrating a communication distance of a radio frequency SIM card (104), characterized in that the method comprises the steps of:

A. Set a calibration value for comparison in the RF power calibration device (100);

B. placing the mobile terminal (102) with the built-in RF SIM card (104) in a hypothetical position in the sensing area of the RF power calibration device (100);

C. The RF power calibration device (100) sends an instruction to the RF SIM card (104), and the RF SIM card (104) receives the command of the power calibration device (100), and continuously transmits power;

D. The RF power calibration device (100) detects the power transmitted by the RF SIM card (104), and converts the related operation into a voltage value, and performs the next step;

E. Determine whether the operation result in the RF power calibration device (100) is greater than or equal to the calibration value described in step A. If the determination result is "No", that is, the operation result is less than the calibration value, the RF power calibrator (100) is The radio frequency SIM card (104) sends an instruction to increase the transmit power of the radio frequency SIM card (104) and returns to step D.

F. In the above step E, if the judgment result is "Yes", that is, the operation result is greater than or equal to the set value, further judge whether the calculation result is greater than or equal to the calibration value, and if it is determined that the calculation result is greater than the calibration value, the RF power calibrator (100) sending an instruction to the radio frequency SIM card (104), reducing the radio frequency SIM card (104) transmit power, and returning to step D;

G. In step F, if it is determined that the calculation result is equal to the calibration value, it indicates that the radio frequency SIM card (104) satisfies the power transmission requirement, and completes the process of calibrating the radio frequency SIM card (104) short-range wireless communication distance.

The method for calibrating a communication distance of a radio frequency SIM card (104) according to claim 6, wherein: the method works in an SHF band, a VHF band or a UHF ultra-high band.

The method for calibrating the communication distance of the radio frequency SIM card (104) according to claim 6, wherein: the method controls the transmit power of the different radio frequency SIM card (104) to be compared with the radio frequency power When the calibration values of the calibration device (100) are identical, the different mobile terminals (102) with the built-in RF SIM card (104) must be placed in the same assumed position in the sensing region described in step B.

The method for calibrating the communication distance of the radio frequency SIM card (104) according to claim 6, wherein: the calibration value in the radio frequency power calibration device (100) in step A can be changed.