Radio frequency identification label number estimating method capable of meeting EPC C1G2 standard and based on time slot states

A technology of EPCC1G2 and radio frequency identification tags, which is applied in the field of radio frequency identification tag quantity estimation based on time slot status, can solve the problems of low estimation accuracy and long estimation time of tag quantity, and achieve high estimation accuracy, short tag estimation time, Effects that are easy to implement

Inactive Publication Date: 2015-06-03
GUANGDONG UNIV OF TECH
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Problems solved by technology

[0005] Aiming at the disadvantages of the existing RFID system, such as too long time to estimate the number of tags, being unable to be used in occasions with a large number of

Method used

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  • Radio frequency identification label number estimating method capable of meeting EPC C1G2 standard and based on time slot states
  • Radio frequency identification label number estimating method capable of meeting EPC C1G2 standard and based on time slot states
  • Radio frequency identification label number estimating method capable of meeting EPC C1G2 standard and based on time slot states

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Embodiment Construction

[0035] The present invention will be further described in detail below in conjunction with the accompanying drawings and specific embodiments.

[0036] Assume that a certain area is uniquely covered by an RFID reader, and there are n tags around it.

[0037] (1) First, the reader broadcasts the frame length F and a randomly generated 16-bit binary number RN16 to the tag by calling the R command. After receiving the command, the tag uses F, RN16 and its own ID as parameters to call The random function in generates self-slots F of labels i , Fi ∈[1,F], and save it in the label slot register. Next, the reader starts to identify the current frame, and sends the L command to broadcast the time slot polling signal to the tag. After receiving the command, the tag will decrement the value in the tag time slot register by 1, if and only if the value is 0 The tag is allowed to respond to the reader in the current time slot, the response signal is a newly generated 16-bit random binary...

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Abstract

The invention discloses a radio frequency identification label number estimating method capable of meeting the EPC C1G2 standard and based on time slot states. The method comprises a time slot state counting stage and a label number estimating stage. In the time slot state counting stage, a reader-writer can count the number of vacant time slots and the number of non-vacant time slots through a one-frame identifying process, and the average length of one bit field can be calculated out. In the label number estimating stage, and the optimal label number estimating value meeting the error accuracy requirement can be searched by the average length, calculated out from real measurement, of one bit field through the one-to-one correspondence of the length of one bit field, the frame length of one bit field and the label number. The method can meet the EPC C1G2 standard, prevents label structures from being changed, is shorter in estimating time, is higher in estimating accuracy and is suitable for occasions with larger label numbers.

Description

Technical field [0001] The invention relates to a method for estimating the number of tags applied in a radio frequency identification (RFID) system, in particular to a method for estimating the number of radio frequency identification tags based on the time slot state and conforming to the EPC C1G2 standard applicable to the RFID system. Background technique [0002] In recent years, radio frequency identification (RFID) technology has increasingly appeared in our daily life. Compared with the traditional two-dimensional barcode and magnetic stripe technology, RFID technology has significant advantages such as visual recognition outside the boundary, work in harsh environments, not easy to be polluted and damaged, and a large amount of recorded information. Therefore, it is widely used in ticket anti-counterfeiting and production automation. , access control, road toll collection, parking lot management, identification, cargo tracking and other fields. Tags can be divided ...

Claims

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Application Information

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IPC IPC(8): G06K17/00
Inventor 杨健蔡庆玲王永华余松森方芳詹宜巨
Owner GUANGDONG UNIV OF TECH
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