Lost label detection method of RFID system

A label detection and label technology, applied in the field of radio frequency identification and the Internet of Things, can solve the problems of low detection efficiency of lost labels and shorten response time, and achieve the effect of shortening response time, improving detection efficiency and high deactivation efficiency.

Active Publication Date: 2020-02-18
CHINA UNIV OF PETROLEUM (EAST CHINA)
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  • Claims
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Problems solved by technology

[0006] The present invention aims at the above-mentioned deficiencies such as the low detection efficiency of lost tags existing in the prior art, and provides a method for detecting lost tags in an RFID system, which can shorten the response time and improve the detection efficiency of lost tags

Method used

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  • Lost label detection method of RFID system
  • Lost label detection method of RFID system
  • Lost label detection method of RFID system

Examples

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Embodiment

[0069] Example: see figure 1 , the reader maps 4 known tags into a 10×3 grid table through 2 hash functions and 3 random seeds. Then the i-th 2-bit binary number in the composite vector represents the row coordinate of the bit whose first value is "0" in the i-th column in the grid table. The reader treats parameters i > and resultant vectors are broadcast to all labels. Each label that receives broadcast information uses 2 hash functions and 3 random seeds R i , i=1, 2, 3 calculate respectively (H 1 (ID, R i ) mod f 1 ), (H 2 (ID,R i ) mod f 1 ) to determine your own identity. That is to say, each label uses at most 2×3 results as index values ​​to find a binary number with a length of 2 in the synthetic vector, so as to judge whether it is an unknown label. If it is an unknown label, then in the subsequent detection time remain silent.

[0070] see figure 2 , the reader first maps all known hash functions with labels R to a length f 2 =10 in the expected frame v...

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Abstract

The invention relates to a lost label detection method for an RFID (Radio Frequency Recognition Device) system, which comprises the following steps that: a reader inactivates unknown labels in the RFID system through a grid table constructed by the reader according to IDs (Identities) and hash functions of all known labels, f1 represents the length of each frame, and l represents the number of random seeds; and the reader detects lost tags in the RFID system according to the IDs of all known tags and multiple hash operations based on ID right shift, performs multiple mapping on each tag duringhash operations, and performs hash operations before the ith mapping and after the IDs of the remaining tags shift rightwards by i-1 bits. According to the method, most of unknown tags can be effectively inactivated, the influence of the unknown tags on detection of the lost tags is greatly reduced, the response time can be shortened, and the detection efficiency of the lost tags is improved.

Description

technical field [0001] The invention belongs to the technical fields of radio frequency identification and the Internet of Things, and relates to a radio frequency identification system, in particular to a method for detecting a lost label of the RFID system. Background technique [0002] A radio frequency identification (English: Radio Frequency Identification, referred to as: RFID) system usually consists of a background server (English: Back-end Server), a reader (English: Reader) and an electronic tag (English: Tag). [0003] The reader is a device that uses radio frequency identification technology to read and write the information in the electronic tag through the antenna. In addition, the reader can also be connected to the background server through the communication interface for data communication. The normal workflow of the RFID system is as follows: first, the reader sends a specific inquiry request, and when the electronic tag within the signal range receives th...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06K7/00
CPCG06K7/0008Y02D30/70
Inventor 林凯陈鸿龙艾欣闫娜石乐义
Owner CHINA UNIV OF PETROLEUM (EAST CHINA)
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