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RFID tag anti-collision method based on grouping frequency and tag estimation

An RFID tag and anti-collision technology, which is applied in the field of RFID tag anti-collision, can solve the problems of reduced algorithm efficiency and increased number of tags, and achieves the effect of reducing time slots and improving throughput.

Inactive Publication Date: 2019-08-16
NORTHWESTERN POLYTECHNICAL UNIV
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Problems solved by technology

[0006] In order to overcome the deficiencies of the prior art, the present invention provides an RFID tag anti-collision method based on grouping frequency and tag estimation, which can not only solve the problem that the number of tags increases and the efficiency of the algorithm decreases, but also accurately estimate the number of tags, and automatically Adapt to adjust the frame length to reduce the time slot used by the system

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  • RFID tag anti-collision method based on grouping frequency and tag estimation

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Embodiment Construction

[0046] The present invention will be further described below in conjunction with the drawings and embodiments.

[0047] In order to solve the problems of the prior art, an embodiment of the present invention provides an anti-collision method for RFID tags based on packet frequency and tag estimation. First, assign different frequencies to the tags, and let the reader scan the time slots randomly selected by the tags, and send them to each tag, and then the tags will adjust the time slots accordingly so that the reader can skip idle time slots and collisions. Slots, adaptively allocate effective time slots, and then quickly identify tags. When the number of unidentified tags is large, grouping and dynamically adjusting the frame length are adopted to reduce the time slot processing time.

[0048] The simulation results show that the present invention improves the system throughput per unit time and reduces the collision time slot, up to 69% or more, which is better than the existin...

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Abstract

The invention provides an RFID tag anti-collision method based on grouping frequency and tag estimation, which adopts a Vogt algorithm to estimate the number of tags to be identified, adopts tags withdifferent frequencies to participate in identification work, introduces multi-frequency tags into a dynamic frame time slot algorithm, establishes communication of the multi-frequency tags in corresponding frame time slots, and performs simulation. According to the invention, the number of to-be-identified tags is increased, the concepts of group identification and multi-frequency tags are increased; the characteristics of a traditional dynamic frame time slot Aloha algorithm and a grouping dynamic frame time slot Aloha algorithm are combined, optimization and improvement are carried out on the basis, compared with an existing mechanism, the system throughput is improved by 274%, the used time slot is reduced by 36%, and certain theoretical and engineering application value is achieved.

Description

Technical field [0001] The invention relates to the field of radio frequency identification (RFID) communication, in particular to an anti-collision method for RFID tags. Background technique [0002] Radio Frequency Identification (RFID) is a non-contact automatic identification technology that can automatically identify target objects and obtain related data through radio frequency signals, and is widely used in many fields such as logistics, security, and product supply. The RFID system consists of a reader and an electronic tag. The reader is responsible for reading the information in the tag. Due to the limitation of the manufacturing process, the general tag adopts a passive structure and is activated by the reader. When multiple electronic tags are in the scope of the same reader, two or more tags may send information to the reader at the same time, so that the reader cannot correctly identify the tags, that is, a tag conflict occurs. In order to improve system throughput...

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Application Information

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IPC IPC(8): G06K7/10
CPCG06K7/10069
Inventor 陈曦何亦昕黄方慧杨萌哈桑杨畅宋哲翟琪
Owner NORTHWESTERN POLYTECHNICAL UNIV
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