Radio frequency identification multiple tag data collision avoiding method

Abstract

A multi-label data collision avoidance method for radio frequency identification, comprising the following steps: adding an independent subframe consisting of a pulse burst area and a busy tone listening area before the tag access reply data frame, wherein the pulse burst area is in The front, the busy tone listening area is behind; the tag that wants to send the tag access reply data frame randomly selects one of the sub-slots in the pulse burst area, and generates a burst pulse; the reader is in contact with the tag pulse burst The burst pulse is detected in the time window corresponding to the area; when the number of pulses detected by the reader is greater than 1, the reader sends a busy tone signal in the busy tone listening area; when the number of pulses detected by the reader is equal to 1, the reader No busy tone signal is sent; the tag detects the signal in the busy tone listening area; when the tag does not detect the busy tone signal in the busy tone listening area, it sends a data frame; when the tag detects a busy tone signal in the busy tone listening area, it does not send a data frame.

Description

technical field [0001] The invention relates to a data collision avoidance method for multipoint-to-point communication in a wireless communication system, in particular to a multi-label data collision avoidance method for an RFID (Radio Frequency Identification, radio frequency identification) system. Background technique [0002] In the RFID system, when multiple tags communicate with the reader at the same time, due to being in the same reply channel, data collisions (or collisions) will occur. In the existing technology and RFID standard, whether multiple tags collide in the simultaneous reply is judged by the decoding of the data encoding in the data frame. The judgment result is only conflict or non-conflict, and no further information can be provided. information about conflicts, such as the number of conflicting tags. [0003] In the prior art, based on the above conflict monitoring method, the reader cannot accurately detect the occurrence of data conflicts, so the...

AI Technical Summary

Problems solved by technology

In the existing technology and RFID standard, whether multiple tags collide in the simultaneous reply is judged by the decoding of the data encoding in the data frame. The judgment result is only conflict or non-conflict, and no further information can be provided. information about conflicts, such as the number of conflicting labels

[0003] In the prior art, on the basis of the above-mentioned conflict monitoring method, the reader cannot accurately detect the occurrence of data conflicts, so it cannot accurately avoid conflicts

In addition, the collision detection in the prior art is performed after the transmission of the entire data frame, so the occurrence of the collision cannot be detected in time, and the collision cannot be avoided in time, and the collided data frames increase the communication flow from the tag to the reader

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