A dual-frequency RFID anti-collision communication method with variable transmission rate

Abstract

The invention discloses a variable-transmission speed double-frequency RFID anti-collision communication method. According to the method, different uplink and downlink frequencies are adopted to carry out full duplex radio frequency communication. The transmission speeds of RFID radio frequency units are decided by two aspects: one side, a card reading unit is capable of changing the transmission speeds of the RFID radio frequency units through sending data bytes; and the other side, the RFID radio frequency units are capable of changing the self-transmission speeds according to the communication data volumes of the other RFID radio frequency units in the surrounding environment through monitoring the adjacent same RFID radio frequency units. According to the method disclosed in the invention, the frequency of receiving the RFID radio frequency units by the card reading unit when the RFID radio frequency units pass through the area of the card reading unit can be improved; and meanwhile, through a manner of carrying out initiative monitoring by the RFID radio frequency units and initiatively changing the self-transmission speeds, the congestion condition in the communication can be effectively prevented, so that the success rate of reading the RFID radio frequency units by the card reading unit I a unit time can be effectively improved.

Description

technical field [0001] The invention relates to the technical field of radio frequency communication, in particular to a dual-frequency RFID anti-collision communication method with variable sending rate. Background technique [0002] At present, the communication method between the mainstream RFID radio frequency unit and the card reader unit is one-way communication, that is, the RFID radio frequency unit sends to the card reader unit, and generally adopts a fixed frequency method, such as sending once every second, and the card reader unit receives the data. Later passed to the background system. Usually, if you want to read a large number of cards in a short period of time, you must speed up the sending frequency of the card, so the second is to send 3 times per second, so that the success rate of the card reading unit is improved, but the card's However, the power consumption increases, and the transmission conflict of the RFID radio frequency unit will also increase. ...

AI Technical Summary

Problems solved by technology

Usually, if you want to read a large number of cards in a short period of time, you must speed up the sending frequency of the card, so the second is to send 3 times per second, so that the success rate of the card reading unit is improved, but the card's Power consumption increases, and RFID radio unit transmission conflicts will also intensify

[0003] Another method is to use two-way communication, that is, the RFID radio frequency unit is usually in a dormant state, wakes up at a fixed interval, and sends its own data after receiving the signal from the card reader unit, but if it is in the same reader If there are too many RFID radio frequency units within the range of the card unit, this method will easily cause conflicts, resulting in poor communication reliability, and this situation often occurs in practical applications

[0004] Another method is to change the sending frequency of the RFID radio frequency unit, that is, the sending data is usually very slow, once it is within the reading range of the card reader unit, the sending frequency of the RFID radio frequency unit will become faster, with a fixed sending frequency Sending data quickly, this method cannot be used in the scene where the card carrier’s driving speed needs to be judged by the sending speed of the card, because the card reading unit does not know when the frequency of the card is changed, and if the card is changed at the same time , when there are a lot of RFID radio frequency units within the range of the card reader unit, it is a bad strategy to send quickly, which will lead to increased congestion

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