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

Abstract

The invention discloses an anti-collision method and device of an RFID system, a computer readable storage medium and a device, and belongs to the technical field of radio frequency identification. The method comprises the steps of S100 estimating the number of labels, and grouping the labels; S200 determining the time slot parameters according to the number of labels of the current group; S300 sending a command with time slot parameters to the tag, and after the tag receives the command, generating a random number to serve as a time slot value; S400 simultaneously receiving the response signal of the tag when three time slots are opened each time, and marking the time slots as idle time slots, successful time slots or collision time slots according to the condition of the response signal;S500 adjusting time slot parameters according to the number of idle time slots, the number of successful time slots and the number of collision time slots; if the successful time slot is 0, returningto the step S200; otherwise, returning to the step S300; The method is high in universality, is simple and easy to realize, solves the label starvation problem, reduces the possibility of label collision, improves the identification efficiency of the system, and optimizes the 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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