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Label recognition anti-collision method for RFID system

A tag identification and anti-collision technology, applied in the field of search anti-collision, can solve problems such as unsuitable for large-scale tag reading, serious frame collision, large randomness, etc., to reduce the total number of transmission bits, quickly identify tags, and fast Effect

Inactive Publication Date: 2008-12-17
SOUTH CHINA UNIV OF TECH
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AI Technical Summary

Problems solved by technology

Among them, the ALOHA method is highly random. When a large number of tags coexist, the frame collision is serious, causing a sharp deterioration in performance, and it is not suitable for large-scale tag reading.

Method used

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  • Label recognition anti-collision method for RFID system
  • Label recognition anti-collision method for RFID system
  • Label recognition anti-collision method for RFID system

Examples

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Embodiment Construction

[0026] The present invention will be further described below in conjunction with the accompanying drawings and examples, but the protection scope of the present invention is not limited to the range expressed in the examples.

[0027] An RFID system generally consists of two parts: a reader and a tag. The reader has the function of reading multiple tags at the same time. When an RFID system is working, there is often more than one tag within the range of the reader. When the data of these tags are transmitted to the reader at the same time, a conflict occurs, that is, a data collision, so that the receiver of the reader cannot read the data. The invention adopts the time-division multiplexing method, searches the arbitration mode according to the binary tree, and enables the reader to effectively identify multiple tags.

[0028] In the RFID system, the tag ID refers to the unique identification code of the tag itself. ID length varies according to different standards (set to...

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PUM

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Abstract

The invention discloses a tag identification and anti-collision method for an RFID system. The method provides a novel enquiry circulation, that is, an enquiry circulation II to acquire a request prefix and greatly reduce the times of the whole enquiry and whole number of transmission bits. The method comprises the following steps: firstly, the request prefix is acquired through the enquiry circulation and pressed in a stack; secondly, a request prefix pops up from the stack and an enquiry circulation I is conducted; if no collision occurs, a tag is identified; if collision happens, another two request prefixes are acquired and pressed in the stack; and another request prefix pops up from the stack, and the enquiry circulation I is conducted; the steps are repeated until the stack is empty and all tags are identified. The method has the advantages of easy operation, reduced energy consumption, identification efficiency of a system as high as 87.0 percent, and suitability for applying to the RFID system.

Description

technical field [0001] The invention relates to a search anti-collision method for an RFID system, in particular to a tag identification anti-collision method for an RFID system. Background technique [0002] Radio Frequency Identification (RFID) is an automatic identification technology that has matured since the 1980s, and has developed rapidly in recent years. Radio frequency identification technology can be used to identify and track almost all physical objects, and thus can build an extensive intelligent network that accommodates and connects all objects in the world. RFID is a non-contact automatic identification technology. Its basic principle is to use the transmission characteristics of radio frequency signals and space coupling (inductive or electromagnetic coupling) to realize automatic identification of specific objects. [0003] At present, RFID technology has not yet formed a unified international standard. The standardization of RFID includes the standardiza...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06K7/00
Inventor 胡斌杰许武忠
Owner SOUTH CHINA UNIV OF TECH
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