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Method for reading electronic tag

A technology of electronic tags and tags, which is applied in the field of radio frequency identification, can solve problems such as the difficulty of obtaining the optimal number of branches, and achieve the effects of easy compatibility, simple implementation, and improved system identification efficiency

Inactive Publication Date: 2011-07-27
PEKING UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Therefore, under the premise that the number of labels is not clear, it is difficult to obtain a reasonable optimal number of branches.

Method used

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  • Method for reading electronic tag
  • Method for reading electronic tag

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0050] Three counters S1, S2 and R are set in the reader, which are initially set to 1, 0 and 0 respectively in this embodiment. S1 changes with the status of the tag reply, and is used to identify the tag currently being processed by the reader, and simulate the change of the tag counter. S2 is used to indicate that the reader is currently processing the tag where the M L When a tag is recognized for the first time or the reader detects that there is no tag reply, S2 records the current count of S1. And the change value of S1 and S2 is m=1. When S1=S2-1, it means that the label identification of the current level is completed. At this time, the number of unidentified labels is estimated according to the number of identified labels in the label counter to determine the label of the next layer. number of branches.

[0051] In the process of reading the tag, the reader sends a query command to the tag, requiring all tags to reply, and at the same time transmits the optimal num...

Embodiment 2

[0089] A specific application example is given below, such as Image 6 Shown: There are 15 tags waiting to be read. The numbers in the box are the query times in turn: counter S1: counter S2: number R of identification tags. The number in the circle is the number of tags to be identified. For example, 0:1:0:0 is the 0th query, that is, the initial state, the counter S1 value is 1, the counter S2 value is 0, and the identification tag R is 0.

[0090] As shown in the figure, from the initial state to the third query, the reader has always detected a tag collision, so the count value of the counter S1 has been increasing by 1. When querying for the 4th time, because a tag is identified, and the tag R=i is identified, S1 minus 1 is equal to 3. Since the relation S1=S2-1 is satisfied at this time, the command S2=S1=3. In the fifth query, since another tag is identified, R=2, and S1 continues to be subtracted by 1 to equal 2. Since the relationship S1=S2-1 is satisfied at this ...

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PUM

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Abstract

The invention belongs to radio frequency identification technology, and in particular relates to a method for reading an electronic tag. The method comprises that: the tag number of other nodes is estimated by utilizing the identified tag number, one or more branches of a multi-branch system are subjected to operation, and the tag number of identified branches is recorded; and the tag number of the identified branches is taken as an estimated value of the tag number of other branches. The method has simple realization, only needs adding a counter in a reader, does not need changing any air interface, is easy to be compatible with the prior protocol, and greatly improves system identification efficiency.

Description

technical field [0001] The invention belongs to the technical field of radio frequency identification, and in particular relates to a method for reading an electronic tag. Background technique [0002] As a key technology, radio frequency identification (RFID) has attracted more and more people's attention because of its many convenient features. It has a very wide application prospect, and its basic application can be used as a substitute for the barcode system that is used more now. What's more convenient is that it can be used in places with particularly harsh environments, bringing more convenience to people. The RFID system consists of three basic parts: Reader, Tag and control system. The Reader can both read the data of the Tag and write data to the Tag. In a passive tag system, the Reader also needs to provide carrier energy to the Tag. Tags are used to store data and affixed to identified items. According to whether batteries are required, Tags are divided into tw...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G06K7/00
Inventor 崔英花赵玉萍王建伟
Owner PEKING UNIV