Radio frequency identification (RFID) anti-collision method for adaptive back-off mechanism

A back-off mechanism and self-adaptive technology, applied in the field of tag anti-collision, can solve the problems that ALOHA algorithm is not suitable for tag reading, the implementation of binary search algorithm is complicated, and the algorithm recognition rate is high, so as to achieve the improvement of recognition success rate, short search time, and improved The effect of recognition efficiency

Active Publication Date: 2013-04-03
GUANGDONG UNIV OF TECH
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Problems solved by technology

The ALOHA algorithm uses irregular time division multiple access, also known as random multiple access, but with the expansion of the number of tags, the performance of the algorithm will deteriorate sharply, so the ALOHA algorithm is not suitable for large-scale tag reading
The circuit implementation of the binary search algorithm is relatively complex, but the algorithm recognition rate is high
Neither of these methods is combined with a backoff mechanism

Method used

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  • Radio frequency identification (RFID) anti-collision method for adaptive back-off mechanism
  • Radio frequency identification (RFID) anti-collision method for adaptive back-off mechanism
  • Radio frequency identification (RFID) anti-collision method for adaptive back-off mechanism

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Embodiment Construction

[0031] The present invention will be further described in detail below in conjunction with the accompanying drawings and specific embodiments.

[0032] Such as figure 1 As shown, the RFID anti-collision method of a kind of efficient self-adaptive back-off mechanism that the present invention is applicable to multi-label comprises steps:

[0033] (1) The reader first initializes all tags within the range of action, and makes a request command, requiring all tags within the range of action to respond. The reader uses Manchester encoding and is able to spot exactly where the bits collided. The location where the collision occurs is indicated by X, and the location where there is no collision records the data received by this bit, and records the original tag ID collision data in the reader's register and sends it to all tags.

[0034] The specific implementation process of the tag ID collision data record using Manchester encoding is: when the corresponding bits of the data ret...

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Abstract

The invention discloses a radio frequency identification (RFID) anti-collision method for an adaptive back-off mechanism. According to the method, different back-off factors are determined and selected according to collision position conditions in the process of identifying a reader, so that all the labels are efficiently and rapidly identified through the adaptive back-off mechanism. According to the method, the adaptive back-off mechanism can be performed, the identification efficiency is greatly improved, and the mechanism is simple and feasible in structure, short in searching time, low in energy consumption and suitable for an RFID application system with lots of strict label and energy consumption requirements.

Description

technical field [0001] The invention relates to a tag anti-collision method in a radio frequency identification (RFID) system, in particular to an RFID anti-collision method with an adaptive back-off mechanism. Background technique [0002] Radio Frequency Identification (RFID for short) is a technology that uses radio frequency signals to achieve non-contact information transmission through spatial coupling (alternating magnetic field or electromagnetic field) and achieve identification purposes through the transmitted information. The basic components of RFID have the following three parts: a tag (Tag) is composed of a coupling element and a chip, each tag has a unique electronic code, and is attached to an object to identify the target object; the reader (Reader) is a device for reading tag information ; Antenna (Antenna) is to transmit radio frequency signals between the tag and the reader. [0003] In the actual application of RFID, in many cases, there is one reader a...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06K7/00
Inventor 程良伦苏海武高锐田刚于皓刘军
Owner GUANGDONG UNIV OF TECH
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