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RFID tag anti-collision recognition method based on modular operation tag classification

A RFID tag and tag classification technology, applied in the field of RFID radio frequency identification, can solve the problems of many interactive processes, strong randomness, and reduced recognition efficiency

Active Publication Date: 2015-10-28
江苏智运科技发展有限公司
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Problems solved by technology

[0006] Although these two algorithms can solve the problem of label conflicts, there are too many interactive processes and the randomness is very strong. When the number of labels is large, the recognition efficiency will be seriously reduced

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  • RFID tag anti-collision recognition method based on modular operation tag classification
  • RFID tag anti-collision recognition method based on modular operation tag classification

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Embodiment Construction

[0025] The invention will be described in further detail below in conjunction with the accompanying drawings.

[0026] Before introducing the present invention in detail, it is necessary to explain the conflict situation of tag reading. Since the tags use the same transmission frequency, three situations may occur when the reader reads the tag at any time slot:

[0027] 1. There is no tag to send a message in this time slot, so it is an empty time slot.

[0028] 2. There is only one tag sending a message in this time slot, and the reader can obtain the message sent by the tag.

[0029] 3. There are two or more tags sending messages in this time slot, that is, tag collision occurs, the reader cannot obtain the message sent by the tag, but can know the collision bit and the value of other bits that have not collided according to the Manchester code.

[0030] The present invention proposes an RFID tag anti-collision recognition method based on modular operation tag classificati...

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Abstract

The invention discloses a radio frequency identification (RFID) label anti-collision identification method based on modular arithmetic label classification, and belongs to the field of RFID in the Internet of Things. According to the method, time slot selection information for detection of information collision is introduced, the collision situation of time slots selected by labels is analyzed, and the number of the labels is estimated. Then, label electronic product codes (EPC) are carried out modular arithmetic step-by-step and congruent labels are classified into one group. After K times modular arithmetic are carried out on each of the labels, the labels are divided into 2k groups, and each group only has labels with a few collision positions. Then, the labels are sent according the time slots corresponding to the groups. The collided labels are processed by adoption of binary tree back-off arithmetic. The RFID label anti-collision identification method is capable of greatly improving identification efficiency of labels, and applicable to rapid identification of a large number of electronic labels of readers in an RFID system.

Description

technical field [0001] The invention relates to an RFID tag anti-collision identification method based on modular operation tag classification, and belongs to the field of RFID radio frequency identification in the Internet of Things. Background technique [0002] As a new automatic identification technology, radio frequency identification (RFID) technology has been widely used in many fields due to its fast, real-time and accurate collection characteristics. The RFID system is mainly composed of three parts: the reader, the tag and the data processing system, among which the reader and the tag use a non-contact working method to exchange information. There are three types of tags in RFID systems: active, semi-active and passive. The passive tag itself is passive, and the energy required for its work is transmitted to it by the reader, and the tags cannot interact with each other. If multiple tags send data at the same time, it will cause data conflicts, so the reader canno...

Claims

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Application Information

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IPC IPC(8): G06K7/00
Inventor 吴剑秦中元郑勇鑫梁彪辛柯俊邹涛
Owner 江苏智运科技发展有限公司
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