Anti-collision method and system for RFID tags

Abstract

The invention discloses a method and system for preventing collision of RFID tags. The method comprises the following steps that a reader uses the total number of digits of an assigned numerical value in the ID of a tag as a group number and groups all the tags according to the group numbers; and the reader successively recognizes the tags according to the group numbers. The method and system reduce the number of tags recognized by the reader at a time, reduces the collision probability of the tags, and improves the recognition efficiency of the reader. The method and system for preventing collision of RFID tags have high recognition efficiency, small system traffic and high system throughput, and can be widely applied in the technical field of RFID.

Description

technical field [0001] The invention relates to the technical field of RFID radio frequency identification, in particular to an RFID tag anti-collision method and system. Background technique [0002] Radio Frequency Identification (RFID) is an automatic identification technology based on radio waves and using radio frequency signals to realize data transmission through space electromagnetic coupling. Compared with traditional barcodes, it has fast recognition speed, long recognition distance, Features such as large data memory capacity. At present, it has been widely used in warehouse management, access control identification, automatic charging and other fields. A typical RFID system consists of a reader and tags, where each tag has a unique ID. The tag sends data to the reader through a wireless channel shared with the reader. If there are multiple tags sending data at the same time, the reader will not be able to read the tag data due to mutual interference between th...

AI Technical Summary

Problems solved by technology

Too many tag collisions will greatly affect the recognition efficiency of the reader

Among the existing RFID tag anti-collision methods, the improved dynamic frame time slot ALOHA algorithm has better performance, but this algorithm has randomness. When there are a large number of tags, there will be a large number of collisions, which will cause the tags to be unrecognizable for a long time. That is, the tag starvation problem still cannot solve the problem of low recognition efficiency of readers

In addition, although the current deterministic algorithm based on binary search tree (binary search, BS) can solve the label starvation problem, at the cost of increasing algorithm complexity, the reader will perform a large number of search queries when there are many collision bits. The system traffic is large, and the tag recognition delay is long, that is, the system throughput rate is low

[0003] In general, the current anti-collision methods for RFID tags have the problems of low recognition efficiency, large system traffic and low system throughput.

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