Radio frequency identification system, reader-writer, tag and communication method

Abstract

The embodiment of the invention provides a radio frequency identification system, a reader-writer, a tag and a communication method. The communication method comprises the following steps of: detecting the tag entering a radio frequency electromagnetic field, wherein if a prestored own radio quiescence command of the tag entering the radio frequency electromagnetic field is nonzero, the tag enters a radio quiescence state; and sending a nonzero wakening command to the tag to waken the tag so that the tag is switched from the radio quiescence state to a ready state, wherein the values of the radio quiescence command and the nonzero wakening command are equal. In the embodiment of the invention, the tag in the radio quiescence state can be wakened to be switched from the radio quiescence state to the ready state only when receiving the nonzero wakening command so as to execute a subsequent checking process to ensure that the only identifying information of the tag is protected by adopting the nonzero wakening command; and the tag can not be checked without an accurate wakening command, and the only identifying information of the tag can not be acquired, therefore, the access safety is enhanced and the illegal communication is effectively resisted.

Description

technical field [0001] The invention relates to the communication field, in particular to a radio frequency identification system, a reader, a label and a communication method. Background technique [0002] A passive radio frequency identification (RFID, Radio Frequency Identify) system includes a tag and a reader. Radio frequency identification technology is a non-contact automatic identification technology. It automatically identifies target objects and obtains relevant data through radio frequency signals. The identification work does not require manual intervention and can work in various harsh environments. RFID technology can identify high-speed moving objects and can identify multiple tags at the same time, and the operation is fast and convenient. It works as follows: [0003] The reader sends information to one or more tags by modulating the radio frequency carrier signal, and the tag obtains working power energy through the RF electromagnetic field of the reader;...

AI Technical Summary

Problems solved by technology

[0015] The purpose of the present invention is to provide a radio frequency identification system, a reader, a label and a communication method to solve the problem of poor security in the prior art

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