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Method applied to ultrahigh frequency reader for efficiently identifying tag

A technology for identifying labels and readers, which is applied to record carriers used in machines, instruments, computer components, etc., and can solve problems such as slow Q convergence

Active Publication Date: 2014-05-07
HANGZHOU DIANZI UNIV
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AI Technical Summary

Problems solved by technology

[0007] The purpose of the present invention is to solve the problems of slow Q convergence speed, high dependence of system throughput on Q initial value and improving system throughput when the initial value setting in the anti-collision algorithm is unreasonable, and to provide an ultra-high frequency A Method for Efficiently Identifying Tags in a Reader

Method used

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  • Method applied to ultrahigh frequency reader for efficiently identifying tag
  • Method applied to ultrahigh frequency reader for efficiently identifying tag
  • Method applied to ultrahigh frequency reader for efficiently identifying tag

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Embodiment Construction

[0039] Such as image 3 As shown, it is a framework flowchart of Q value adjustment for the whole system tag recognition process. The figure illustrates the Q value adjustment mode in step (3) of the method of the present invention. First, after the system sends Query, when the system does not reach the ideal critical value of 0.317, the system adjusts the Q value in the manner shown in Table 1. Secondly, when the system reaches the ideal critical value, use ΔQ=Q-round(log2((1-S)*2 Q )) to adjust the Q value. Use the above two adjustment methods to maximize the utilization of system resources. The specific implementation method is as follows:

[0040] Step (1). At the beginning of an inventory cycle, use the throughput function when the number of tags to be identified is greater than or equal to the number of time slots, the function monotonically decreases. At this time, the system sets the Q value to 2, and does not consider the number of tags less than 4 In the case, whe...

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Abstract

The invention discloses a method applied to an ultrahigh frequency reader for efficiently identifying a tag. According to the method, firstly, a Q initial value of a system is set to be 2, the maximum likelihood estimation method is combined with the method, and the throughput rate of the system is calculated; secondly, the monotony of the throughput rate function when the tag number is larger than the time slot number, different step lengths delta Q are adopted for fast adjusting the Q value according to a throughput rate grouping manner of the system, and therefore the system can be in the optimal Q value identifying state all the time to perform identifying. According to the method, the throughout rate is stabilized to be at least 33 percent, when the Q initial value is smaller than the tag number, the set of the Q initial value little influences the throughout rate of the system, the dependency on the set of the Q initial value by the system is greatly relieved, and the stability and practicability of the system are improved.

Description

technical field [0001] The invention belongs to the field of RFID (Radio Frequency Identification, radio frequency identification), and in particular relates to a method for efficiently identifying tags applied to ultra-high frequency readers. Background technique [0002] Radio frequency identification RFID technology is a non-contact automatic identification technology, which obtains the relevant data stored in the label of the object through radio frequency, and identifies the object, and can also modify the relevant data. It has the characteristics of read and write, long recognition distance, good security, and strong real-time performance. It is widely used in industrial automation, commercial automation, logistics, anti-counterfeiting, military and other fields, and has become one of the hot spots in the current logistics network technology research. [0003] The UHF RFID system refers to the radio frequency identification system working at 860-960MHz, which is compos...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06K19/077
Inventor 陈科明徐春艳严迪科孙智勇庄伟武杨伊利
Owner HANGZHOU DIANZI UNIV
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