Method for enhancing communication stability between non-contact card and card reader

Abstract

The invention discloses a method for enhancing communication stability between a non-contact card and a card reader, belonging to the field of communication technology. The method provided by the invention comprises the following steps: starting timeout timing and a receiver by the card reader to wait for receiving data; stopping the timeout timing when detecting a subcarrier before timeout and receiving data and judging whether received data frames have frame errors; if the received data frames have frame errors, discarding the data frames and continuing timeout timing; if the received data frames have no frame errors, judging whether CRC (cyclic redundancy check) and / or odd-even check for the data frames are / is correct or not; if the CRC and / or odd-even check for the data frames are / is correct, judging whether the data frames have other errors; if the data frames have other errors, discarding the data frames and continuing timeout timing; if the data frames have no other errors, closing the receiver and sending the received data to an upper computer; if the CRC and / or odd-even check for the data frames are / is incorrect, judging whether the lengths of the data frames is less than a pre-set byte; if the lengths of the data frames is less than the pre-set byte, discarding the data frames and continuing timeout timing; if the lengths of the data frames is not less than the pre-set byte, judging whether the data frames is complete or not; if the data frames is complete, closing the receiver; if the data frames is incomplete, discarding the data frames and continuing timeout 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...

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

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