Multiple tag dynamic bit arbitration anti-collision method for RFID system

A multi-label, anti-collision technology, applied in the direction of instruments, induction record carriers, computer parts, etc., can solve the problems of unsuitable large-scale label reading, serious frame collision, large randomness, etc., to save recognition time, execute Fast, fast effects

Inactive Publication Date: 2007-11-28
SOUTH CHINA UNIV OF TECH
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Problems solved by technology

Among them, the ALOHA algorithm 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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  • Multiple tag dynamic bit arbitration anti-collision method for RFID system

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Embodiment Construction

[0023] 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.

[0024] 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 and the bit-based query arbitration mode, so that the reader can effectively identify multiple tags.

[0025] Set an 8-bit register (marked as TR) in the tag of the RFID system; set a collision bit stack (marked as B), a prefix stack (marked as S), and a temporary register (marked...

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Abstract

The invention discloses a multiple label dynamic bit arbitration anti-collision method for RFID system. The method uses a bit register in the label for saving the collision position information of the label in the identifying process; the saving unit of the reader is equipped with a collision position stack, a prefix stack, a temporary reservoir for recording the information of the collision process. The method comprises the following steps: initializing and inquiring the total mark code of the label firstly; inquiring the collision position according to the bit and recording the information of the collision position secondly; identifying the label and determining the next label entering in the active state according to the standard and completing identifying all the labels at last. The invention shows the advantages of binary tree search algorithm sufficiently, which reduces the inquiring times and the receiving bit number, provides a simple structure and a low energy.

Description

technical field [0001] The invention relates to a dynamic bit arbitration anti-collision method, in particular to a multi-label dynamic bit arbitration anti-collision method applied to 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 in...

Claims

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Application Information

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