WO2018210002A1 - Procédé et dispositif de traitement d'interférences - Google Patents

Procédé et dispositif de traitement d'interférences Download PDF

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Publication number
WO2018210002A1
WO2018210002A1 PCT/CN2018/074335 CN2018074335W WO2018210002A1 WO 2018210002 A1 WO2018210002 A1 WO 2018210002A1 CN 2018074335 W CN2018074335 W CN 2018074335W WO 2018210002 A1 WO2018210002 A1 WO 2018210002A1
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WIPO (PCT)
Prior art keywords
signal
card reader
nfc card
matching result
error indication
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PCT/CN2018/074335
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English (en)
Chinese (zh)
Inventor
林君
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中兴通讯股份有限公司
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Publication of WO2018210002A1 publication Critical patent/WO2018210002A1/fr

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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B5/00—Near-field transmission systems, e.g. inductive or capacitive transmission systems
    • H04B5/70—Near-field transmission systems, e.g. inductive or capacitive transmission systems specially adapted for specific purposes
    • H04B5/72—Near-field transmission systems, e.g. inductive or capacitive transmission systems specially adapted for specific purposes for local intradevice communication
    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06K—GRAPHICAL DATA READING; PRESENTATION OF DATA; RECORD CARRIERS; HANDLING RECORD CARRIERS
    • G06K7/00—Methods or arrangements for sensing record carriers, e.g. for reading patterns
    • G06K7/10—Methods or arrangements for sensing record carriers, e.g. for reading patterns by electromagnetic radiation, e.g. optical sensing; by corpuscular radiation
    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06K—GRAPHICAL DATA READING; PRESENTATION OF DATA; RECORD CARRIERS; HANDLING RECORD CARRIERS
    • G06K7/00—Methods or arrangements for sensing record carriers, e.g. for reading patterns
    • G06K7/10—Methods or arrangements for sensing record carriers, e.g. for reading patterns by electromagnetic radiation, e.g. optical sensing; by corpuscular radiation
    • G06K7/10009—Methods or arrangements for sensing record carriers, e.g. for reading patterns by electromagnetic radiation, e.g. optical sensing; by corpuscular radiation sensing by radiation using wavelengths larger than 0.1 mm, e.g. radio-waves or microwaves
    • G06K7/10158—Methods or arrangements for sensing record carriers, e.g. for reading patterns by electromagnetic radiation, e.g. optical sensing; by corpuscular radiation sensing by radiation using wavelengths larger than 0.1 mm, e.g. radio-waves or microwaves methods and means used by the interrogation device for reliably powering the wireless record carriers using an electromagnetic interrogation field
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B5/00—Near-field transmission systems, e.g. inductive or capacitive transmission systems
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B5/00—Near-field transmission systems, e.g. inductive or capacitive transmission systems
    • H04B5/70—Near-field transmission systems, e.g. inductive or capacitive transmission systems specially adapted for specific purposes
    • H04B5/77—Near-field transmission systems, e.g. inductive or capacitive transmission systems specially adapted for specific purposes for interrogation

Definitions

  • the present disclosure relates to, but is not limited to, the field of wireless communication technologies, and more particularly to interference processing methods and apparatus.
  • NFC Near Field Communication
  • NFC technology Common applications of NFC technology are, for example, bus cards, company access cards, etc., cards and card readers are equipped with NFC modules, and NFC modules work in half-duplex mode.
  • the amplitude of the modulated signal received by the card is on the order of 100 millivolts (mv), and the amplitude of the modulated signal received by the card reader is on the order of 10 mv. Therefore, the communication performance/communication distance of the NFC module is mainly limited.
  • the decision threshold of the card reader detection signal is unreasonable, it is easy to misinterpret the interference signal as erroneous data, thereby Affect the NFC communication process.
  • the antenna performance of the NFC module is weak, the communication distance is small, the probability of transaction recognition is high, and the user experience is poor.
  • mode one optimize the power of the reader and the direction of the signal.
  • this method can increase the communication distance, it is limited by the specification limit. After reaching a certain performance, the effect is limited.
  • set a reasonable decision threshold For example, many reader manufacturers can lower the decision threshold as much as possible. Without changing the performance and directionality of the NFC antenna, the reader can detect weaker signals and improve communication distance. However, if the decision threshold is set too low, the probability of erroneously detecting the interference signal increases.
  • Embodiments of the present disclosure provide an interference processing method including the steps of: a Near Field Communication (NFC) card reader transmitting a request signal; when the NFC card reader receives a modulated signal and fails decoding the modulated signal, Matching the modulation signal with a preset condition to obtain a matching result; and the NFC card reader selects whether to send an error indication signal according to the matching result.
  • NFC Near Field Communication
  • the step of selecting, by the NFC card reader, whether to send an error indication signal according to the matching result comprises: when the matching result is that the matching is successful, the NFC card reader Transmitting the error indication signal; when the matching result is a match failure, the NFC card reader does not send the error indication signal.
  • the interference processing method as described above further includes: after the NFC card reader sends the request signal, the NFC card reader determines the preset condition, wherein the NFC card reader according to the request Determining a time range in which the response signal is received as the preset condition, at least one of a type of a signal and a time range statistic value of the NFC card reader receiving the response signal, or the NFC card reader according to the Determining, according to at least one of a type of the request signal, a content requested by the request signal, and a data length statistical value of the response signal received by the NFC card reader, a data length of the response signal as the preset condition .
  • the step of the NFC card reader selecting whether to send an error indication signal according to the matching result includes: : when the matching result is that the modulation signal is within the determined time range, the NFC card reader sends the error indication signal; when the matching result is that the modulation signal is in the determined time range In addition, the NFC card reader does not transmit the error indication signal.
  • the NFC card reader when the preset condition is a data length of the response signal, and the data length is a data length range, the NFC card reader is configured according to the matching result.
  • the step of selecting whether to send the error indication signal includes: when the matching result is that the data length of the modulation signal is within the data length range, the NFC card reader sends the error indication signal; when the matching result The NFC card reader does not transmit the error indication signal when the data length of the modulation signal is outside the data length range.
  • the NFC card reader when the preset condition is a data length of the response signal, and the data length is a data length set, the NFC card reader is configured according to the matching result.
  • the step of selecting whether to send the error indication signal includes: when the matching result is that the data length of the modulation signal is equal to any one of the data length sets, the NFC card reader sends the error indication signal; The NFC card reader does not transmit the error indication signal when the matching result is that the data length of the modulation signal is not equal to each element in the data length set.
  • the interference processing method as described above further includes: after the NFC card reader sends the request signal, the NFC card reader determines the preset condition, wherein the NFC card reader determines to receive the location Determining a probability threshold of the response signal as the preset condition, and determining a probability coefficient corresponding to the modulated signal received at different times according to a time when the request signal is sent, or the NFC card reader is preset according to the NFC
  • the signal type determines the preset feature information of the response signal as the preset condition.
  • the NFC card reader when the preset condition is the probability threshold of receiving the response signal, performs the modulation signal with the preset condition.
  • the step of matching includes: the NFC card reader acquiring an initial probability of the modulated signal according to at least one of a characteristic, an intensity, and a data length of the modulated signal; the NFC card reader calculating the modulated signal Generating, by a product of an initial probability and a probability coefficient corresponding to the modulation signal, a signal probability, and comparing the signal probability with the probability threshold, the NFC card reader selecting whether to send an error indication signal according to the matching result
  • the step includes: when the matching result is that the signal probability is greater than or equal to the probability threshold, the NFC card reader sends the error indication signal; when the matching result is that the signal probability is less than the probability threshold The NFC card reader does not transmit the error indication signal.
  • the NFC card reader matches the modulation signal with the preset condition
  • the step of the NFC card reader selecting whether to send the error indication signal according to the matching result comprises: when the matching result is the feature information of the modulation signal and the response signal When the matching degree of the feature information is greater than or equal to the feature threshold, the NFC card reader sends the error indication signal; when the matching result is the feature information of the modulation signal and the preset feature information of the response signal The NFC card reader does not transmit the error indication signal when the degree of matching is less than the feature threshold.
  • the interference processing method as described above further includes: when the NFC card reader does not receive the response signal within a preset response time, resending the request signal.
  • the embodiment of the present disclosure further provides an interference processing apparatus, including: a sending module, configured to send a request signal; a receiving module, configured to receive a modulated signal; and a decoding module, configured to decode the modulated signal received by the receiving module; a matching module, configured to: when the decoding module fails to decode the modulated signal, match the modulated signal with a preset condition to obtain a matching result, where the sending module is further configured to obtain according to the matching module The matching result selects whether to send an error indication signal.
  • a sending module configured to send a request signal
  • a receiving module configured to receive a modulated signal
  • a decoding module configured to decode the modulated signal received by the receiving module
  • a matching module configured to: when the decoding module fails to decode the modulated signal, match the modulated signal with a preset condition to obtain a matching result, where the sending module is further configured to obtain according to the matching module
  • the matching result selects whether to send an error indication signal.
  • the sending by the sending module, whether to send the error indication signal according to the matching result, the sending module sends the error indication signal when the matching result is that the matching is successful.
  • the sending module does not send the error indication signal.
  • the interference processing device as described above further includes: a determining module, configured to determine the preset condition, wherein the determining module receives the response signal according to the type of the request signal and the NFC card reader At least one of the time range statistics, determining a time range in which the response signal is received as the preset condition, or according to a type of the request signal, a content requested by the request signal, and the NFC card reading At least one of a data length statistical value of the response signal received by the device, determining a data length of the response signal as the preset condition, or determining a probability threshold for receiving the response signal as the preset condition, and Determining, according to a time when the request signal is sent, a probability coefficient corresponding to the modulated signal received at different times, or determining, according to a preset signal type in the NFC, preset feature information of the response signal as the preset condition .
  • a determining module configured to determine the preset condition, wherein the determining module receives the response signal according to the type of the request
  • the sending module selects whether to send an error indication according to the matching result.
  • the signal includes: when the matching result is that the modulation signal is within the determined time range, the sending module sends the error indication signal; when the matching result is that the modulation signal is in the determined time range When the device is outside, the sending module does not send the error indication signal.
  • the sending module when the preset condition determined by the determining module is a data length of the response signal, and the data length is a data length range, the sending module is configured according to Selecting whether to send the error indication signal by the matching result includes: when the matching result is that the data length of the modulation signal is within the data length range, the sending module sends the error indication signal; when the matching result is The transmitting module does not transmit the error indication signal when the data length of the modulation signal is outside the data length range.
  • the sending module when the preset condition determined by the determining module is a data length of the response signal, and the data length is a data length set, the sending module is configured according to Selecting whether to send the error indication signal by the matching result includes: when the matching result is that the data length of the modulation signal is equal to any one of the data length sets, the sending module sends the error indication signal; The transmitting module does not transmit the error indication signal when the matching result is that the data length of the modulation signal is not equal to each element in the data length set.
  • the matching module when the preset condition determined by the determining module is the probability threshold of receiving the response signal, includes: an acquiring unit, configured to: Acquiring at least one of a characteristic, an intensity, and a data length of the modulated signal, an initial probability of acquiring the modulated signal; a calculating unit, configured to calculate an initial probability of the modulated signal acquired by the acquiring unit, and determined by the determining module And a matching unit, configured to compare a signal probability calculated by the calculating unit with a probability threshold determined by the determining module, where the sending module selects according to the matching result Whether the error indication signal is sent includes: when the matching result is that the signal probability is greater than or equal to the probability threshold, the sending module sends the error indication signal; when the matching result is that the signal probability is less than the The probability that the transmission module does not transmit the error indication signal.
  • the matching module compares the modulation signal with the pre- Setting the condition to match includes: matching the feature information of the modulated signal with the preset feature information of the response signal, wherein the feature information of the modulated signal includes a modulation mode, an amplitude, and a data length of the modulated signal.
  • the sending module selecting whether to send an error indication signal includes: when the matching result is that the matching degree of the feature information of the modulation signal and the preset feature information of the response signal is greater than or When the value is equal to the feature threshold, the sending module sends the error indication signal; when the matching result is that the matching degree of the feature information of the modulated signal and the preset feature information of the response signal is less than the feature threshold, The transmitting module does not transmit the error indication signal.
  • the sending module is further configured to resend the request signal when the receiving module does not receive the response signal within a preset response time.
  • Embodiments of the present disclosure also provide an interference processing apparatus including a memory and a processor, the memory is configured to save executable instructions, and the processor is configured to execute the executable instructions saved by the memory to perform the following operations Transmitting a request signal; when receiving the modulated signal and decoding the modulated signal fails, matching the modulated signal with a preset condition to obtain a matching result; and selecting whether to send an error indication signal according to the matching result.
  • An embodiment of the present disclosure further provides a computer readable storage medium storing computer executable instructions, and when the processor executes the computer executable instructions, performing an operation of: transmitting a request signal; When receiving the modulated signal and decoding the modulated signal fails, the modulated signal is matched with a preset condition to obtain a matching result; and whether to send an error indication signal is selected according to the matching result.
  • the NFC card reader waits for a response signal after transmitting the request signal, and when the NFC card reader receives the modulation signal and fails to decode the modulated signal, the modulation signal is pre- The condition is matched, and whether the error indication signal is sent according to the obtained matching result, the preset condition can reflect the characteristic of the response signal to some extent, and therefore, the matching result can reflect the similarity between the modulated signal and the response signal.
  • the NFC card reader sends an error indication signal according to the degree of similarity between the modulation signal and the response signal, so that the interference signal can be effectively misjudged as an error signal, thereby improving the reliability of the NFC card reader. Ensure the sensitivity of communication in long-distance areas.
  • FIG. 1 is a schematic diagram of a communication flow of an NFC technology
  • FIG. 2 is a schematic diagram of a principle of sending data by a card in an NFC technology
  • FIG. 3 is a schematic flow chart of a communication abnormality of an NFC technology
  • FIG. 4 is a flowchart of an interference processing method according to an embodiment of the present disclosure.
  • FIG. 5 is a flowchart of another interference processing method according to an embodiment of the present disclosure.
  • FIG. 6 is a schematic diagram of an application scenario of an interference processing method according to an embodiment of the present disclosure.
  • FIG. 7 is a schematic diagram of another application scenario of an interference processing method according to an embodiment of the present disclosure.
  • FIG. 8 is a schematic diagram of still another application scenario of an interference processing method according to an embodiment of the present disclosure.
  • FIG. 9 is a schematic diagram of still another application scenario of an interference processing method according to an embodiment of the present disclosure.
  • FIG. 10 is a schematic diagram of still another application scenario of an interference processing method according to an embodiment of the present disclosure.
  • FIG. 11 is a schematic structural diagram of an interference processing apparatus according to an embodiment of the present disclosure.
  • FIG. 12 is a schematic structural diagram of another interference processing apparatus according to an embodiment of the present disclosure.
  • FIG. 13 is a schematic structural diagram of still another interference processing apparatus according to an embodiment of the present disclosure.
  • Step 1 shows a communication flow diagram of an NFC technology, as shown in FIG. 1, including the following steps: Step 1, the NFC card reader sends a request signal; Step 2, the card returns a response signal; Step 3, NFC card reader An error signal is detected; in step 4, the NFC card reader sends an error indication signal R (NAK) to the card; in step 5, the card resends the response signal.
  • Step 1 the NFC card reader sends a request signal
  • Step 2 the card returns a response signal
  • Step 3 NFC card reader
  • An error signal is detected
  • step 4 the NFC card reader sends an error indication signal R (NAK) to the card
  • step 5 the card resends the response signal.
  • NAK error indication signal
  • a decision threshold is preset in the NFC reader, and when the received modulated signal (for example, the response signal in step 2 or other interference signal) exceeds the decision threshold, decoding is initiated.
  • the received modulated signal for example, the response signal in step 2 or other interference signal
  • the NFC card reader frequently sends an error indication signal due to erroneous detection of an interference signal
  • the card will enter an infinite loop, that is, discarding data, processing data, preparing to transmit data, and interrupting transmission, thereby
  • the entire NFC communication process is confusing, causing communication failure.
  • the interference signal increases. If the decision threshold is set too low, the NFC reader will fail to decode because the interference signal exceeds the decision threshold, thereby erroneously sending an error indication signal into the communication abnormal process, resulting in a close-range area.
  • the communication success rate is reduced, that is, the reliability of NFC communication cannot be guaranteed.
  • NFC communication includes the following two key communication mechanisms: mechanism 1, the card obtains the energy emitted by the NFC reader by electromagnetic coupling to operate; mechanism 2, the card transmits the signal to the NFC reader by changing the load.
  • the resistor R1 in FIG. 2 is a load resistor when the card is in operation, and the resistor R2 is a load resistor that can be connected and disconnected.
  • the card switch K When the card switch K is closed, the load resistor R2 is connected to the circuit, the card load becomes large, and the voltage (point A) detected by the card reader is lowered.
  • the load resistor R2 When the card switch K is turned on, the load resistor R2 is not connected to the circuit, the card load becomes small, and the voltage (point A) detected by the card reader rises.
  • the power consumption of the card varies with the operating state, and the equivalent load resistance R1 also changes, causing the voltage at the reader end to change. If the decision threshold of the NFC reader is low, the change of the resistor R1 is judged as the access and non-access of the resistor R2, that is, the card itself generates strong interference, and the NFC card reader and card The closer the distance, the more obvious the interference.
  • the card reader immediately sends an error indication signal. After the card receives the error indication signal, it resends the response signal, transmits again, and reads the card. The device correctly receives the response signal, thereby completing a normal signaling interaction process, that is, the communication flow shown in FIG.
  • FIG. 3 shows a flow diagram of a communication anomaly of NFC technology. It can be seen that the misinterpretation of the interference signal as the response signal sent by the card has a serious impact on the NFC communication process. At present, in NFC communication, it is urgent to provide an interference processing method that can effectively distinguish between an interference signal and a response signal transmitted by a card.
  • the NFC card reader in the following embodiments of the present disclosure is a card reader configured with an NFC module, and can be a card reader of a bus card and a company access card.
  • a card reader, or a terminal device equipped with an NFC module for implementing the function of the NFC card reader
  • the card interacting with the NFC card reader may be a bus card, an access card or a mobile terminal configured with an NFC module ( Used to implement the function of the card).
  • the following specific embodiments of the present disclosure may be combined with each other, and the same or similar concepts or processes may not be described in some embodiments.
  • FIG. 4 is a flowchart of an interference processing method according to an embodiment of the present disclosure.
  • the method may be performed by an interference processing device, and the interference processing device may be combined by hardware and software.
  • the interference processing device can be integrated in the processor of the NFC card reader for use by the processor.
  • the interference processing method of the embodiment of the present disclosure may include the following steps S110 to S130.
  • the NFC card reader sends a request signal.
  • the interference processing method provided by the embodiment of the present disclosure is a processing method in which an NFC card reader detects a modulated signal and performs interference determination in NFC communication.
  • the NFC communication process includes an initialization process and a signaling transmission process, and the card is close to the NFC card reader to trigger communication.
  • the signaling transmission process is as shown in FIG. 1 above, and the interference processing method provided by the embodiment of the present disclosure is mainly directed to the NFC.
  • the signaling transmission process in communication that is, the process of performing data communication after initialization has been completed.
  • the NFC card reader in the embodiment of the present disclosure may wait for receiving the response signal after transmitting the request signal, and perform a response operation according to the response signal.
  • the NFC card reader when receiving the modulation signal and decoding the modulation signal fails, matches the modulation signal with a preset condition to obtain a matching result, where the decoded modulation signal is a signal whose intensity is greater than or equal to the interference threshold.
  • the NFC card reader may receive various modulated signals after transmitting the request signal and waiting for receiving the response signal, and the received modulated signal may be a response of the card transmission.
  • the signal may also be an interference signal in the environment.
  • the NFC reader After receiving the modulated signal, the NFC reader first determines whether the modulated signal is greater than or equal to the interference threshold (ie, a predetermined threshold of the NFC reader), and when the modulated signal is greater than or equal to the interference threshold, triggering The modulated signal is decoded. If the decoding fails, the modulated signal may be an error signal. However, the modulated signal may also be an interference signal.
  • the error indication signal is not sent first, but the modulation signal is matched with the preset condition to obtain a matching result.
  • the NFC card reader selects whether to send an error indication signal according to the matching result.
  • the NFC card reader when the NFC card reader receives the modulation signal greater than or equal to the interference threshold and fails to decode the modulation signal, the modulation signal is matched with the preset condition of the reception response, and a The matching result can reflect whether the modulated signal is similar to the error signal or the interference signal to some extent. At this time, the NFC card reader can select to send the error indication signal or not to send the error indication signal according to the matching result.
  • the matching result obtained by the NFC card reader indicates that the modulated signal is an interference signal
  • the interference signal is misjudged as an error signal, which affects the entire flow of the NFC communication, and the method provided by the embodiment of the present disclosure
  • the preset condition may be configured for the response signal, that is, the modulation signal with a higher degree of matching with the preset condition may be regarded as an error signal sent by the card, and the modulation with a lower matching degree with the preset condition.
  • the signal can be considered as an interference signal, and the similarity of the matching can be pre-configured by the designer. For example, when the modulated signal completely meets the preset condition, the matching is considered to be successful, and the modulated signal is an error signal, for example, in the modulated signal and the preset condition. When the matching degree reaches a certain threshold, the matching is considered to be successful, and the modulated signal is an error signal.
  • the concept of the interference processing method provided by the embodiments of the present disclosure is based on the NFC technology, if the NFC card reader sends an error indication signal to the card immediately when the modulation signal is detected and the decoding fails, and if the modulation signal is by the card itself Or the interference signal generated by the external environment, the card is processing the response data when receiving the error indication signal. At this time, the card stops the data processing and re-processes the data, and the card may generate more interference during the processing.
  • the signal causes the NFC card reader to detect the interference signal again and send the error indication signal again, so that the NFC card reader and the card enter the infinite loop shown in FIG. 3, which reduces the performance of the NFC card reader.
  • the setting of the decision threshold of the NFC card reader in the NFC technology is very critical. If the decision threshold is set too low, although the communication over a long distance can be ensured, it is easy to misinterpret the interference signal as The phenomenon of the error signal reduces the reliability of the NFC card reader. If the decision threshold is set too high, although the reliability of the short-range area communication can be ensured and the phenomenon of interference misjudgment is reduced, it is difficult to ensure a long distance area. The sensitivity of communication.
  • the NFC card reader when the NFC card reader detects the modulation signal and fails to decode, the NFC card reader does not immediately send an error indication signal to the card, but instead decodes the failed modulation signal and the reception response signal.
  • the preset condition is matched, and then the error indication signal is selectively transmitted according to the matching result, and the related information of the modulated signal can be obtained by the above matching result, that is, the matching result can reflect the similarity of the modulated signal and the response signal to some extent. degree.
  • the error indication signal can be sent when the modulation signal is close to the response signal, and the error indication signal is not sent when the modulation signal is close to the interference signal, so that the interference signal generated by the card itself and the external environment can be largely filtered out.
  • the NFC card reader waits for a response signal after transmitting the request signal, and the NFC card reader receives the modulated signal and fails to decode the modulated signal, and the modulated signal and the preset condition are Performing matching, and selecting whether to send an error indication signal according to the obtained matching result, the preset condition may reflect the characteristic of the response signal to some extent, and therefore, the matching result may reflect the similarity between the modulated signal and the response signal, such that The NFC card reader selectively transmits the error indication signal according to the degree of similarity between the modulation signal and the response signal, thereby effectively avoiding the misinterpretation of the interference signal as an error signal, thereby improving the reliability of the NFC card reader while ensuring the long distance.
  • the sensitivity of regional communication is compatible with high reliability and high sensitivity.
  • FIG. 5 is a flowchart of another interference processing method according to an embodiment of the present disclosure.
  • step S130 in the embodiment of the present disclosure may include the sub-step: S131, when the matching result is that the matching is successful, the NFC card reader sends an error indication signal; S132, when the matching result is a matching failure The NFC card reader does not send an error indication signal.
  • whether the matching result is a matching success may be, for example, the modulation signal completely conforms to the preset condition, or the modulation signal falls within a preset condition, or may be a matching of the modulation signal and the preset condition.
  • the degree reaches a certain threshold.
  • the NFC card reader after transmitting the request signal, not only needs to wait for receiving the response signal, but also may include: S111, and the NFC card reader determines the preset condition.
  • the manner in which the NFC card reader determines the preset condition may be, for example, according to the type of the sent request signal, the requested content, the statistical result of receiving the response signal within a period of time, and the response of the NFC standard protocol to the card transmission.
  • the specification of the signal determines that the preset condition can reflect the characteristics of the response signal to some extent.
  • the embodiment of the present disclosure does not limit the specific content of the preset condition, as long as the condition that can correctly reflect the response signal feature can be used as the preset condition.
  • the embodiment of the present disclosure also does not limit the matching success.
  • the form may be a perfect match or a certain degree of matching, as long as it can reflect that the modulated signal and the response signal have a high degree of similarity, it can be considered that the matching is successful, and the embodiments of the present disclosure are not
  • the limited NFC card reader determines the preset condition only according to the above factors, and as long as it is a characteristic that can respond to the response signal, it can be used as a factor for determining the preset condition.
  • the content of the preset condition of the received response signal determined by the NFC card reader is different, and the manner in which the NFC card reader matches the modulated signal is different from the preset condition, and the obtained matching result and the judgment are sent.
  • the principle of the error indication signal is also different, and the following is explained in detail through several embodiments.
  • the implementation manner of determining the preset condition by the NFC card reader may include: the NFC card reader according to the type of the request signal and the time when the NFC card reader receives the response signal. At least one of the range statistics determines the time range in which the response signal is received.
  • the NFC technical specification there are various types of request signals, some of which are used for authentication operations. The time window of the request signal of this type is relatively late, and some request signals are used for selecting operations, and the time of request signals of this type. The window is more advanced.
  • the NFC card reader can obtain the earliest and latest time of the card return response signal in its application type according to a large amount of statistical data, and use the first and last time counted as the time range of receiving the response signal.
  • the implementation manner of the NFC card reader selecting whether to send the error indication signal may include: when the matching result is that the modulation signal is within the determined time range, the NFC card reader sends an error indication signal; when the matching result is The NFC card reader does not transmit an error indication signal when the modulated signal is outside of the determined time range.
  • FIG. 6 is a schematic diagram of an application scenario of an interference processing method according to an embodiment of the present disclosure.
  • the preset condition in this embodiment is a time range of receiving a response signal, that is, a time window in FIG. 6 (t1). , t2), after the request signal is sent, the NFC card reader respectively receives the modulated signals S1 and S2 exceeding the interference threshold, and the decoding of both S1 and S2 fails.
  • S1 is outside the time window (t1, t2), and the NFC card reader judges that S1 is an interference signal, does not send an error indication signal, continues to receive the signal, and S2 is within the time window (t1, t2).
  • the NFC card reader determines that S2 is a response signal sent by the card. Since the decoding of the S2 fails, the NFC card reader needs to send an error indication signal to instruct the card to resend the response signal, and the NFC card reader sends the error indication signal. Continue to wait to receive the response signal.
  • the NFC card reader distinguishes the interference signal and the signal sent by the card by setting the expected time (time window) of the response signal. Although the NFC card reader receives the interference signal, it does not affect the entire process of the NFC communication. .
  • the implementation manner that the NFC card reader determines the preset condition may include: the NFC card reader according to the type of the request signal, the content requested by the request signal, and the NFC The card reader receives at least one of the data length statistics of the response signal to determine the data length of the response signal.
  • the type of the request signal and the content requested by the request signal are different, and the data length of the received response signal is also different.
  • the NFC card reader can also obtain the card return response signal of the application type according to a large amount of statistical data. The data length statistical value is used as the data length of the received response signal.
  • the data length may be a data length range
  • the implementation manner of the NFC card reader selecting whether to send the error indication signal may include: when the matching result is a data length of the modulation signal at the data length When the range is within, the NFC card reader sends an error indication signal; when the matching result is that the data length of the modulation signal is outside the above data length range, the NFC card reader does not send an error indication signal.
  • the data length may be a data length set
  • the implementation manner of the NFC card reader selecting whether to send the error indication signal may include: when the matching result is the data length of the modulation signal and the foregoing data. When any one of the length sets is equal, the NFC card reader sends an error indication signal; when the matching result is that the data length of the modulated signal is not equal to each element in the above data length set, the NFC card reader does not send an error. Indication signal.
  • FIG. 7 is a schematic diagram of another application scenario of the interference processing method according to the embodiment of the present disclosure.
  • the preset condition in this embodiment is a data length set of the received response signal, that is, the data length in FIG. 7.
  • the set ⁇ L1, L2 ⁇ after the request signal is sent, the NFC reader receives the modulated signals S1, S2, and S3 exceeding the interference threshold, respectively, and the decoding fails for S1, S2, and S3.
  • the length of S1 is less than L2, and the NFC card reader judges that S1 is an interference signal, does not send an error indication signal, and continues to receive signals.
  • the length of S2 is greater than L2 and less than L1, and the NFC card reader judges that S2 is interference.
  • the signal does not send the error indication signal, and continues to receive the signal.
  • the length of S3 is equal to L2, and the NFC card reader determines that S3 is the response signal sent by the card. Since the decoding of the S3 fails, the NFC card reader needs to send an error indication signal.
  • the response card is resent by the instruction card, and the NFC card reader continues to wait for the reception response signal after transmitting the error indication signal.
  • the NFC card reader distinguishes the interference signal and the signal transmitted by the card by setting the expected data length of the response signal. Although the NFC card reader receives the interference signal, it does not affect the entire flow of the NFC communication.
  • the implementation manner of determining, by the NFC card reader, the preset condition may include: determining, by the NFC card reader, a probability threshold of receiving the response signal, and according to the sending request signal The time determines the probability coefficient corresponding to the modulated signal received at different times.
  • the NFC card reader fails to estimate the time range or data length of the received response signal. After the request signal is sent, the response signal is returned within a specified time, for example, returning at the latest 4 seconds (s). Therefore, as time increases, the probability that the signal exceeding the interference threshold is the response signal sent by the card is getting larger and larger, that is, the later the received modulation signal corresponds to a higher probability coefficient.
  • the implementation manner that the NFC card reader matches the modulation signal with the preset condition may include: the NFC card reader obtains the initial of the modulation signal according to at least one of the feature, the intensity, and the data length of the modulation signal. Probability, the NFC reader calculates the product of the initial probability of the modulated signal and the probability coefficient corresponding to the modulated signal to obtain the signal probability and compares the signal probability to the probability threshold. The NFC card reader can obtain the characteristic, intensity and data length of the response signal according to a large number of statistical values of the received response signal. Therefore, the initial probability of the modulated signal can be obtained according to the above characteristics of the modulated signal. It should be noted that if the NFC is NFC If the card reader cannot obtain the initial probability of the modulated signal, the initial probability can be considered to be 1.
  • the implementation manner of the NFC card reader selecting whether to send the error indication signal may include: when the matching result is that the signal probability is greater than or equal to the probability threshold, the NFC card reader sends an error indication signal; when the matching result is a signal probability When the probability threshold is less than the probability threshold, the NFC reader does not send an error indication signal.
  • FIG. 8 is a schematic diagram of still another application scenario of the interference processing method according to the embodiment of the present disclosure.
  • the preset condition in this embodiment is a probability threshold of receiving a response signal, where the probability threshold is preset.
  • the NFC card reader can also estimate the probability coefficients of the modulated signals received at different times. After the request signal is sent, the NFC card readers respectively receive the modulated signals S1, S2, and S3 that exceed the interference threshold. And the decoding failures of S1, S2, and S3 are respectively performed, and the probability coefficients corresponding to S1, S2, and S3 are 0.3, 0.5, and 0.8, respectively.
  • the initial probabilities of the NFC readers acquiring the three signals S1, S2, and S3 are respectively 5/3, 1.2 and 1.375.
  • the NFC card reader determines that S3 is a response signal sent by the card. Since the decoding of the S3 fails, the NFC card reader needs to send an error indication signal to instruct the card to resend the response signal, and the NFC card reader sends the error indication signal to continue. Waiting to receive a response signal.
  • the NFC card reader cannot effectively determine the interference signal, the probability threshold of the response signal, the probability coefficient of the modulated signal received at different times, and the initial probability of acquiring the modulated signal received at different times are obtained.
  • the interference signal is not prematurely judged as the response signal sent by the card, so that the entire flow of the NFC communication is not affected.
  • the implementation manner of determining the preset condition by the NFC card reader may include: determining, by the NFC card reader, the response signal according to a preset signal type in the NFC. Preset feature information.
  • the response signal sent by the card has specific feature information. For example, the application type of the NFC card reader is different, and the symbol composition of the response signal sent by the corresponding card is also different.
  • the implementation manner that the NFC card reader matches the modulation signal with the preset condition may include: the NFC card reader matches the feature information of the modulation signal with the preset feature information of the response signal, where the modulation The characteristic information of the signal includes at least one of a modulation mode, an amplitude, and a data length of the modulated signal.
  • the implementation manner of the NFC card reader selecting whether to send the error indication signal may include: when the matching result is that the matching degree of the feature information of the modulation signal and the preset feature information of the response signal is greater than or equal to the feature threshold, NFC The card reader sends an error indication signal; when the matching result is that the matching degree of the feature information of the modulation signal and the preset feature information of the response signal is less than the feature threshold, the NFC card reader does not send the error indication signal.
  • FIG. 9 is a schematic diagram of still another application scenario of the interference processing method according to the embodiment of the present disclosure.
  • the response signal sent by the card is composed of symbol 1 and symbol 2, that is, The preset feature information of the response signal in this embodiment is a combination of symbol 1 and symbol 2.
  • the NFC card reader After the request signal is sent, the NFC card reader respectively receives the modulated signals S1 and S2 exceeding the interference threshold, and pairs S1 and S2. If the decoding fails, the NFC card reader compares S1 and S2 with the combination of symbol 1 and symbol 2 respectively. Since the difference between S1 and S2 and the combination of symbol 1 and symbol 2 is large, it is judged as an interference signal. The error indication signal is not sent and the signal continues to be received.
  • the interference processing method provided by the embodiment of the present disclosure can effectively distinguish the interference signal and the response signal sent by the card, thereby avoiding the problem of false detection caused by the decision threshold setting being too low.
  • the embodiment of the present disclosure also uses the statistical information of the response signal to utilize the statistical characteristics of the response signal in the process of signal detection and judgment, and judges the signal that does not have the statistical feature as the interference signal, and once it is determined as the interference signal, directly discards
  • the NFC card reader can greatly reduce the decision threshold, thereby increasing the communication distance, and can improve the sensitivity of the NFC card reader while ensuring the sensitivity of the communication in the long-distance region.
  • the interference processing method provided by the embodiment of the present disclosure may further include: when the NFC card reader does not receive the response signal within the preset response time, resending the request signal.
  • FIG. 10 is a schematic diagram of still another application scenario of the interference processing method provided by the embodiment of the present disclosure.
  • the NFC card reader sends a request. After the signal, waiting for receiving the response signal, receiving two modulated signals S1 (interference signal) and S2 (signal sent by the card), decoding failed for both S1 and S2, but S2 is also misidentified as an interference signal by the NFC reader. Therefore, no error indication signal is sent after S2.
  • the NFC card reader does not correctly receive the response signal until the response timeout, and then retransmits the request signal.
  • the NFC card reader misjudges the response signal as an interference signal, it can automatically return to the normal state without affecting the entire flow of the NFC communication.
  • FIG. 11 is a schematic structural diagram of an interference processing apparatus according to an embodiment of the present disclosure.
  • the interference processing device can be implemented by a combination of hardware and software, and the interference processing device can be integrated in the NFC.
  • the processor of the card reader is used by the processor to call.
  • the interference processing apparatus 10 of this embodiment may include a transmitting module 11, a receiving module 12, a decoding module 13, and a matching module 14, wherein the transmitting module 11 is configured to transmit a request signal, and the receiving module 12 is configured to receive a modulation.
  • the signal decoding module 13 is configured to decode the modulated signal received by the receiving module 12, and the decoded modulated signal is a signal whose strength is greater than or equal to the interference threshold.
  • the matching module 14 is configured to: when the decoding module 13 fails to decode the modulated signal, The modulated signal is matched with a preset condition to obtain a matching result.
  • the interference processing apparatus provided by the embodiment of the present disclosure is for processing for detecting a modulation signal and performing interference determination in NFC communication.
  • the NFC communication process includes an initialization process and a signaling transmission process, and the card is close to the NFC card reader to trigger communication.
  • the signaling transmission process is as shown in FIG. 1 above, and the interference processing device provided by the embodiment of the present disclosure is mainly directed to the NFC.
  • the signaling transmission process in communication that is, the process of performing data communication after initialization has been completed.
  • the transmitting module 11 in the embodiment of the present disclosure transmits the request signal
  • the NFC card reader can wait for receiving the response signal and perform a response operation according to the response signal.
  • the receiving module 12 may receive various modulated signals, and the received modulated signal may be The response signal sent by the card may also be an interference signal in the environment.
  • the receiving module 12 After the receiving module 12 receives the modulated signal, it first determines whether the modulated signal is greater than or equal to an interference threshold (ie, a predetermined threshold in the NFC card reader), and when the modulated signal is greater than or equal to the interference threshold, triggers the decoding module. 13
  • the decoded signal is decoded. If the decoding fails, the modulated signal may be an error signal. However, the modulated signal may also be an interference signal.
  • the sending module 11 does not send the error indication signal first, but the matching module 14 matches the modulated signal with the preset condition to obtain a matching result.
  • the sending module 11 is further configured to select whether to send an error indication signal according to the matching result obtained by the matching module 14.
  • the matching module 14 matches the modulated signal with the preset condition of the received response, and obtains a matching result.
  • the matching result can reflect whether the modulated signal is similar to the error signal or the interference signal to a certain extent.
  • the transmitting module 11 can select the transmission error indication signal or the error indication signal according to the matching result.
  • the transmitting module 11 in the device can effectively avoid the situation in which the interference signal is mistakenly determined as an error signal by selectively transmitting the error indication signal according to the matching result, and at the same time, the sensitivity of the NFC card reader can be effectively ensured.
  • the preset condition may be configured for the response signal, that is, the modulation signal with a higher degree of matching with the preset condition may be regarded as an error signal sent by the card, and the modulation with a lower matching degree with the preset condition.
  • the signal can be considered as an interference signal, and the similarity of the matching can be pre-configured by the designer. For example, when the modulated signal completely meets the preset condition, the matching is considered to be successful, and the modulated signal is an error signal, for example, in the modulated signal and the preset condition. When the matching degree reaches a certain threshold, the matching is considered to be successful, and the modulated signal is an error signal.
  • the concept of the interference processing apparatus is based on the fact that, in the NFC technology, if the NFC card reader detects a modulated signal and fails to decode, it immediately sends an error indication signal to the card, and if the above modulated signal is a card
  • the interference signal generated by the self or the external environment, the card is processing the response data when receiving the error indication signal. At this time, the card stops the data processing and re-processes the data, and the card may generate more during the processing.
  • the interference signal causes the NFC card reader to detect the interference signal again and send the error indication signal again, so that the NFC card reader and the card enter the infinite loop shown in FIG. 3, which reduces the performance of the NFC card reader.
  • the setting of the decision threshold of the NFC card reader in the NFC technology is very critical. If the decision threshold is set too low, although the communication over a long distance can be ensured, it is easy to misinterpret the interference signal as The phenomenon of the error signal reduces the reliability of the NFC card reader. If the decision threshold is set too high, although the reliability of the short-range area communication can be ensured and the phenomenon of interference misjudgment is reduced, it is difficult to ensure a long distance. Sensitivity of regional communication.
  • the NFC card reader when the NFC card reader detects the modulation signal and fails to decode, the NFC card reader does not immediately send an error indication signal to the card, but preprocesses the decoding failure signal and the reception response signal. The condition is matched, and then the error indication signal is selectively transmitted according to the matching result, and the correlation information of the modulation signal can be obtained by the above matching result, that is, the matching result can reflect the degree of similarity between the modulation signal and the response signal to some extent.
  • the error indication signal can be sent when the modulation signal is close to the response signal, and the error indication signal is not sent when the modulation signal is close to the interference signal, so that the interference signal generated by the card itself and the external environment can be largely filtered out.
  • the interference processing device provided by the embodiment of the present disclosure is configured to perform the interference processing method provided by the embodiment shown in FIG. 4 of the present disclosure, and has a corresponding functional module, and the implementation principle and the technical effect are similar, and details are not described herein again.
  • the implementation manner of the sending module 11 in the embodiment of the present disclosure for selecting whether to send an error indication signal according to the matching result may include: when the matching result is that the matching is successful, the sending module 11 sends an error indication signal; when the matching result is When the match fails, the transmitting module 11 does not send an error indication signal.
  • whether the matching result is a matching success may be, for example, the modulation signal completely conforms to the preset condition, or the modulation signal falls within the range of the preset condition, or may be the matching degree between the modulation signal and the preset condition. A certain threshold is reached.
  • FIG. 12 is a schematic structural diagram of another interference processing apparatus according to an embodiment of the present disclosure.
  • the interference processing apparatus 10 provided by the embodiment of the present disclosure may further include a determining module 15 for determining the received preset condition after the sending module 11 sends the request signal.
  • the determining module 15 determines the preset condition, for example, according to the type of the sent request signal, the requested content, the statistical result of receiving the response signal within a period of time, and the NFC standard protocol pair card.
  • the specification of the response signal is determined, and the preset condition can reflect the characteristics of the response signal to some extent.
  • the embodiment of the present disclosure does not limit the specific content of the preset condition, as long as the condition that can correctly reflect the response signal feature can be used as the preset condition.
  • the embodiment of the present disclosure also does not limit the matching success.
  • the form may be a perfect match or a certain degree of matching, as long as it can reflect that the modulated signal and the response signal have a high degree of similarity, it can be considered that the matching is successful, and the embodiments of the present disclosure are not
  • the limit determination module 15 determines the preset condition only according to the above factors, and as long as it is a feature that can respond to the response signal, it can be used as a factor for determining the preset condition.
  • the content of the preset condition of the received response signal determined by the determining module 15 is different, and the manner in which the matching module 14 matches the modulated signal and the preset condition is different, and the obtained matching result and the sending module 11 determine whether to send or not.
  • the principle of the error indication signal is also different, and the following is explained in detail through several embodiments.
  • the interference processing apparatus provided by the embodiment of the present disclosure is configured to perform the interference processing method provided by the embodiment shown in FIG. 5 of the present disclosure, and has a corresponding functional module, and the implementation principle and the technical effect are similar, and details are not described herein again.
  • the determining, by the determining module 15, the implementation manner of the preset condition may include: according to a type of the request signal and a time range statistic value of the NFC card reader receiving the response signal. At least one item determines the time range in which the response signal is received.
  • the specific manner in which the determining module 15 determines the time range in which the response signal is received has been described in detail in the above embodiments, and therefore will not be described herein.
  • the implementation manner of the sending module 11 selecting whether to send the error indication signal according to the matching result may include: when the matching result is that the modulation signal is within the determined time range, the sending module 11 sends an error indication signal; When the modulated signal is outside the determined time range, the transmitting module 11 does not transmit an error indication signal.
  • the determining module 15 determines that the implementation manner of the preset condition may include: according to the type of the request signal, the content requested by the request signal, and the response received by the receiving module 12 At least one of the data length statistics of the signal determines the data length of the response signal.
  • the specific manner in which the determining module 15 determines the data length of the received response signal has been described in detail in the above embodiments, and therefore will not be described herein.
  • the data length may be a data length range
  • the implementation manner of the sending module 11 selecting whether to send the error indication signal according to the matching result may include: when the matching result is the data length of the modulation signal, When the data length is within the range, the sending module 11 sends an error indication signal; when the matching result is that the data length of the modulated signal is outside the data length range, the transmitting module 11 does not send the error indication signal.
  • the data length may be a data length set
  • the implementation manner of the sending module 11 selecting whether to send the error indication signal according to the matching result may include: when the matching result is the data length of the modulated signal When any one of the data length sets is equal, the sending module 11 sends an error indication signal; when the matching result is that the data length of the modulated signal is not equal to each element in the data length set, the sending module 11 does not send an error indication signal.
  • the determining, by the determining module 15, the implementation manner of the preset condition may include: determining a probability threshold of receiving the response signal, and according to the time when the sending module 11 sends the request signal And determining a probability coefficient corresponding to the modulated signal received at different times.
  • the specific manner in which the determining module 15 determines the probability threshold of receiving the response signal and the probability coefficient corresponding to the modulated signal received at different times has been described in detail in the above embodiments, and therefore will not be described herein.
  • the matching module 14 may include: an acquiring unit, configured to acquire an initial probability of the modulated signal according to at least one of a feature, an intensity, and a data length of the modulated signal; and a calculating unit configured to calculate the acquired by the acquiring unit The product of the initial probability of the modulated signal and the probability coefficient corresponding to the modulated signal determined by the determining module 15 is used to obtain a signal probability; the matching unit is configured to compare the signal probability calculated by the calculating unit with the probability threshold determined by the determining module 15.
  • the implementation manner of the sending module 11 selecting whether to send the error indication signal according to the matching result may include: when the matching result is that the signal probability is greater than or equal to the probability threshold, the sending module 11 sends an error indication signal; when the matching result is a signal When the probability is less than the probability threshold, the transmitting module 11 does not transmit an error indication signal.
  • the determining, by the determining module 15, the implementation manner of the preset condition may include: determining preset feature information of the response signal according to a preset signal type in the NFC.
  • the specific manner in which the determining module 15 determines the preset feature information of the received response signal has been described in detail in the foregoing embodiment, and thus is not described herein again.
  • the matching module 14 can match the modulation signal with the preset condition, and the method includes: matching the feature information of the modulated signal with the preset feature information of the response signal, where the feature information of the modulated signal includes modulation At least one of a modulation mode, an amplitude, and a data length of the signal.
  • the implementation manner of the sending module 11 selecting whether to send the error indication signal according to the matching result may include: when the matching result is that the matching degree of the feature information of the modulated signal and the preset feature information of the response signal is greater than or equal to the feature threshold.
  • the sending module 11 sends an error indication signal.
  • the sending module 11 does not send the error indication signal.
  • the sending module 11 is further configured to resend the request signal when the receiving module 12 does not receive the response signal within a preset response time.
  • the transmitting module 11 and the receiving module 12 in the embodiment shown in FIG. 11 and FIG. 12 of the present disclosure may be implemented by a transceiver of an NFC card reader, and the determining module 15, the decoding module 13, and the matching module 14
  • the processor may be implemented by a processor of a network node, such as a central processing unit (CPU), or an application specific integrated circuit (ASIC), or One or more integrated circuits implementing embodiments of the present disclosure.
  • FIG. 13 is a schematic structural diagram of still another interference processing apparatus according to an embodiment of the present disclosure.
  • the interference processing device 20 provided in this embodiment may include a memory 21 for holding executable instructions, and a processor 22 for executing the executable instructions saved by the memory 21 to perform the following operations.
  • S31 transmitting a request signal;
  • S32 when receiving the modulated signal and decoding the modulated signal fails, matching the modulated signal with a preset condition to obtain a matching result; and
  • S33 selecting whether to send an error indication signal according to the matching result.
  • the implementation of the operation step S33 may include: S331, when the matching result is that the matching is successful, sending an error indication signal; S332, when the matching result is When the match fails, the error indication signal is not sent.
  • the processor 22 executes the executable instruction, after performing the operation step S31, the following operation is further performed: determining the preset condition.
  • the implementation manner of determining the preset condition may include the following: First, determining, according to at least one of a type of the request signal and a time range statistic value of the NFC reader receiving the response signal. The time range of the response signal; secondly, determining the data length of the response signal according to at least one of the type of the request signal, the content requested by the request signal, and the data length statistical value of the response signal received by the NFC reader; Three, determining a probability threshold of receiving the response signal, and determining a probability coefficient corresponding to the modulated signal received at different times according to the time of transmitting the request signal; and fourth, determining a response signal according to a preset signal type in the NFC Preset feature information.
  • step S33 when the processor 22 executes the executable instruction has been described in detail in the foregoing embodiment, and thus is not described herein again.
  • An embodiment of the present disclosure further provides a computer readable storage medium storing computer executable instructions, when the processor executes the computer executable instructions, performing the following operations: S41, transmitting a request signal; S42 When receiving the modulated signal and decoding the modulated signal fails, the modulated signal is matched with a preset condition to obtain a matching result; and S43, according to the matching result, whether to send an error indication signal is selected.
  • the implementation of operation step S43 may include: S431, when the matching result is that the matching is successful, sending an error indication signal; S432, when If the match result is that the match fails, the error indication signal is not sent.
  • the processor executes the computer executable instruction, after performing the operation step S41, the following operation is further performed: determining a preset condition.
  • the implementation manner of determining the preset condition may include the following: First, determining, according to at least one of a type of the request signal and a time range statistic value of the NFC reader receiving the response signal. The time range of the response signal; secondly, determining the data length of the response signal according to at least one of the type of the request signal, the content requested by the request signal, and the data length statistical value of the response signal received by the NFC reader; Determining a probability threshold of receiving the response signal, and determining a probability coefficient corresponding to the modulated signal received at different times according to the time of transmitting the request signal; and fourth, determining the response signal according to a preset signal type in the NFC Preset feature information.
  • the processor when the processor executes the computer executable instruction, the processor further performs the following operations: S44: when the response signal is not received within the preset response time, the request signal is retransmitted.
  • each module/unit in the above embodiment may be implemented in the form of hardware, for example, by implementing an integrated circuit to implement its corresponding function, or may be implemented in the form of a software function module, for example, executing a program stored in the memory by a processor. / instruction to achieve its corresponding function.
  • Embodiments of the present disclosure are not limited to any particular form of combination of hardware and software.

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Abstract

Des modes de réalisation de la présente invention concernent un procédé et un dispositif de traitement d'interférences. Le procédé de traitement d'interférences dans les modes de réalisation de la présente invention comprend les étapes suivantes : envoyer, par un lecteur de carte à communication en champ proche (NFC), un signal de demande ; lorsque le lecteur de carte NFC reçoit un signal de modulation et ne parvient pas à décoder le signal de modulation, faire correspondre le signal de modulation avec une condition prédéterminée pour obtenir un résultat de correspondance ; et choisir, par le lecteur de carte NFC, en fonction du résultat de correspondance, s'il faut envoyer un signal d'indication d'erreur.
PCT/CN2018/074335 2017-05-19 2018-01-26 Procédé et dispositif de traitement d'interférences WO2018210002A1 (fr)

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CN112311424A (zh) * 2019-08-01 2021-02-02 恩智浦有限公司 近场通信接收器中的动态灵敏度控制

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