Anti-collision method, device, computer-readable storage medium and equipment of RFID system

Abstract

The invention discloses an anti-collision method, device, computer-readable storage medium and equipment of an RFID system, belonging to the technical field of radio frequency identification. The method includes: Step S100: Estimate the number of tags and group the tags; Step S200: Determine the time slot parameter according to the number of tags in the current group; Step S300: Send a command with time slot parameters to the tag, and the tag receives the command Then generate a random number as the time slot value; step S400: open three time slots each time and receive the response signal of the tag at the same time, and mark the time slot as an idle time slot, a successful time slot or a collision time slot according to the situation of the response signal; step S500: Adjust time slot parameters according to the number of free time slots, successful time slots and collision time slots; if the number of successful time slots is 0, return to step S200; otherwise, return to step S300. The invention has high versatility, is simple and easy to implement, solves the label starvation problem, reduces the possibility of label collision, improves system identification efficiency, and optimizes system performance.

Description

technical field [0001] The invention relates to the technical field of radio frequency identification, in particular to an anti-collision method, device, computer-readable storage medium and equipment of an RFID system. Background technique [0002] RFID refers to radio frequency identification technology (Radio Frequency IDentification), which identifies the information in the electronic tag through spatial coupling, and feeds back the acquired information to the reader to realize the data exchange between the reader and the electronic tag. This technology has the advantages of high safety, anti-pollution, fast recognition speed, large data capacity, fast and convenient reading, and dynamic change of label data. It has been widely used in logistics transportation, personnel management, automated production and other fields. [0003] During the identification process of the RFID system, it is often the case that multiple tags send information to the reader at the same time. ...

AI Technical Summary

Problems solved by technology

[0006] However, the Framed Slotted ALOHA (Framed Slotted ALOHA, FSA) algorithm has the following disadvantages: when the number of tags is much larger than the number of slots in the data frame, the possibility of tag collision increases; when the number of tags is much smaller than the number of slots in the data frame time slot waste

[0008] However, the length of the data frame that the reader can provide is limited (the maximum is N max =256), when the number of tags within the reading range of the reader is much greater than the maximum length of the data frame, the recognition efficiency of the dynamic frame time slot ALOHA algorithm drops sharply

Therefore, the concept of grouping dynamic frame time slots is proposed, and each group of tags is identified in turn, which reduces the amount of one-time identification of the system, but the throughput rate of this algorithm is still not high, about 30%, and all ALOHA Algorithms are random, and there will always be some labels that cannot be identified, that is, there is a "label starvation" problem

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