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Label anti-collision method based on self-adaption ternary inquiry split in mobile RFID system

A ternary, self-adaptive technology, applied in the field of tag anti-collision, can solve the problems of poor tag recognition ability, etc., and achieve the effect of solving poor recognition ability, excellent recognition delay, and shortened length

Inactive Publication Date: 2016-11-23
NORTHWESTERN POLYTECHNICAL UNIV
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AI Technical Summary

Problems solved by technology

[0004] In order to overcome the deficiency of poor label recognition ability in existing methods, the present invention provides a label anti-collision method based on adaptive ternary query splitting in a mobile RFID system

Method used

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  • Label anti-collision method based on self-adaption ternary inquiry split in mobile RFID system
  • Label anti-collision method based on self-adaption ternary inquiry split in mobile RFID system
  • Label anti-collision method based on self-adaption ternary inquiry split in mobile RFID system

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Embodiment Construction

[0048] refer to Figure 1-4 . The specific steps of the tag anti-collision method based on adaptive ternary query splitting in the mobile RFID system of the present invention are as follows:

[0049] 1. Aiming at the problem of converting the tag ID sequence from binary to ternary, construct a conversion method and build a ternary query tree for subsequent ternary solutions, effectively reducing the number and length of query commands when identifying tags;

[0050] According to the length of the tag ID sequence, it can be divided into the following two cases:

[0051] (1) Binary is completely converted into ternary;

[0052] When l / 3=L / 2, the formula 1 for converting the tag ID sequence from binary to ternary is:

[0053] a i ×2 2 +a i+1 ×2 1 +a i+2 ×2 0 =b j ×3 1 +b j+1 ×3 0 (1)

[0054] Among them, l is the length of the binary representation of the tag ID sequence; L is the length of the ternary representation of the tag ID sequence; the binary representatio...

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Abstract

The invention discloses a label anti-collision method based on self-adaption ternary inquiry split in a mobile RFID system. The label anti-collision method is adopted for solving the technical problem of poor label recognition capability of the present method. According to the technical scheme, a corresponding conversion formula is given according to the relationship between binary representation and ternary representation of the label ID sequence, a ternary inquiry tree is built and the property of a tree type recognition scheme is optimized, so that the application problem of ternary inquiry split is solved. A ternary solution is put forward according to the ternary inquiry split characteristics of inquiry order in the ternary inquiry tree, so that the original remaining label in a read-writing area is quickly recognized and the quantity of the inquiry orders is reduced; the ternary inquiry tree scheme is utilized to recognize the newly added label and the length of the inquiry orders can be shortened, so that the technical problem of poor label recognition capability is effectively solved; the split block technique is utilized to respectively solve the information collision problem of the original remained label and the newly added label; on the basis, a novel communication flow for label recognition is designed.

Description

technical field [0001] The invention belongs to the field of radio frequency identification (RFID) communication, in particular to a tag anti-collision method based on self-adaptive ternary query splitting in a mobile RFID system. Background technique [0002] Radio Frequency Identification (RFID) is a non-contact automatic identification system, which is widely used in logistics, transportation, security, target tracking and other occasions. In general, an RFID system consists of multiple readers and large-scale passive tags, and the communication between readers and tags is based on a shared wireless data channel. When multiple tags respond to the query command of a reader at the same time, the tag collision problem will occur, which will affect the normal recognition of tags and prolong the recognition time, which is a key problem that needs to be solved urgently. In the mobile RFID environment, the tag has mobility, that is, it can enter or leave the reading and writing...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06K7/10
CPCG06K7/10029
Inventor 蒋毅张若南程伟李彬
Owner NORTHWESTERN POLYTECHNICAL UNIV
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