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A method for enhancing the stability of communication between a contactless card and a card reader

A non-contact card and card reader technology, applied in the field of communication, can solve the problems of low success rate, error reporting, poor stability, etc., and achieve the effect of improving communication stability

Active Publication Date: 2015-09-23
FEITIAN TECHNOLOGIES
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] In the process of realizing the present invention, the inventor found that the prior art has at least the following disadvantages: the communication between the existing contactless card reader and the contactless card is easily interfered by external radio frequency, the stability is poor, and when both parties receive After receiving the wrong data frame, it will directly perform error processing, such as error reporting, retransmission, etc., so that the data is received multiple times in the case of frequent interference, and the success rate is low

Method used

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  • A method for enhancing the stability of communication between a contactless card and a card reader
  • A method for enhancing the stability of communication between a contactless card and a card reader
  • A method for enhancing the stability of communication between a contactless card and a card reader

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Embodiment 1

[0069] see figure 1 , the embodiment of the present invention provides a specific implementation method for enhancing the communication stability between a contactless card and a card reader. , the card reader receives the command sent from the buffer in the USB interrupt pipeline mode, if the first byte of the command is within the preset range (0x01-0x03), it means that a valid command has been received, if the card reader does not receive it Or the first byte of the received command does not meet the preset value, then the received command is not a valid command; the card reader performs the following operations after receiving a valid command:

[0070] Step 101: Determine the command type, if it is a notification card search command, then perform step 102, if it is an APDU command, then perform step 108, if it is an extended command, then perform step 122;

[0071] Preferably, in this embodiment, the card reader judges the first byte of the command received, if it is 0x01...

Embodiment 2

[0132] see image 3 , the embodiment of the present invention provides a specific implementation method for enhancing the communication stability between a contactless card and a card reader. , the card reader receives the command sent from the buffer in the USB interrupt pipeline mode, if the first byte of the command is within the preset range (0x01-0x03), it means that a valid command has been received, if the card reader does not receive it Or the first byte of the received command does not meet the preset value, then the received command is not a valid command; the card reader performs the following operations after receiving a valid command:

[0133] Step 201: Determine the command type, if it is a notification card search command, then perform step 202, if it is an APDU command, then perform step 208, if it is an extended command, then perform step 222;

[0134] Preferably, in this embodiment, the card reader judges the first byte of the command received, if it is 0x01...

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Abstract

The invention discloses a method for enhancing stability of communication between a contactless card and a card reader, relating to communication field. In the method, the card reader initiates time-out timing and a receiver, waits for receiving data, when the time-out does not happen and sub-carrier wave is detected, the card reader stops time-out timing, receives data and determines whether there is frame error in the received data frame, if yes, discards the data frame and goes on time-out timing; otherwise, determines whether CRC check and / or parity check of the data frame is correct, if the CRC check and / or the parity check of the data frame are correct, determines whether there is other error in the data frame, if there is other error in the data frame, discards the data frame and goes on time-out timing; if there is not other error in the data frame, shuts down the receiver and sends the received data to a host; or if the CRC check and / or the parity check of the data frame are not correct, determines whether length of the data frame is smaller than preset byte, if length of the data frame is smaller than preset byte, discards the data frame and goes on time-out timing; if length of the data frame is not smaller than preset byte, determines whether the data frame is integrate, if the data frame is integrate, shuts down the receiver; if the data frame is not integrate, discards the data frame and goes on time-out timing.

Description

technical field [0001] The invention belongs to the technical field of communication, in particular to a method for enhancing the stability of a non-contact card and a card reader. Background technique [0002] Contactless card is a new type of smart card, which combines radio frequency technology and IC card technology. Its function is the same as that of contact ID card and IC card, except that it does not need power supply. The receiving antenna takes power from the magnetic field induction of the card reader, and works. data, fed back to the reader. Compared with contact IC cards, contactless cards have the advantages of high reliability, convenient operation, anti-collision, suitable for various applications, and good encryption performance, so they are widely used. [0003] In the process of realizing the present invention, the inventor found that the prior art has at least the following disadvantages: the communication between the existing contactless card reader and...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G06K7/00H04L1/00
CPCG06Q20/204G06Q20/352G06K7/10009G06K7/10366
Inventor 陆舟于华章
Owner FEITIAN TECHNOLOGIES
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