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Radio frequency identification process frame length selection method based on slotted random

A technology of radio frequency identification and identification process, applied in the field of radio frequency identification, to achieve the effect of improving the speed of label identification

Inactive Publication Date: 2008-04-30
FUDAN UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0011] The purpose of the present invention is to address the shortcomings of existing frame length selection methods, and propose a frame length selection method that considers different time slot lengths in the label identification process

Method used

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  • Radio frequency identification process frame length selection method based on slotted random
  • Radio frequency identification process frame length selection method based on slotted random
  • Radio frequency identification process frame length selection method based on slotted random

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Embodiment Construction

[0033] Embodiments of the present invention will be described in detail below in conjunction with the accompanying drawings.

[0034] The tag identification process of collision includes collision time slot and empty time slot. In the collision time slot, when the tag receives the QueryRep command sent by the reader, it will wait for the signal processing time of length T1, and then feed back RN16 to read and write. After receiving the conflicting RN16, the device waits for the signal processing time of T2, and then sends the next command to open the next time slot. In the empty time slot, the reader finds that there is no tag feedback signal after waiting for T1, and the reader will wait for a time of T3 before sending the next command. Figure 1 shows the collision time slot length l in the ISO18000-6C protocol k Schematic diagram, as shown in the figure, the collision time slot is composed of QueryRep command, T1, T2, RN16, and Figure 2 shows the length of the empty time sl...

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Abstract

The invention belongs to the technical field of radiofrequency identification, and particularly relates to a method for selection frame length during time slot-based random frequency identification procedure. The method includes initiating a reader / writer; allowing the reader / writer to receive data returned from a tag, adding 1 to space time slot number c0 if the data is not received; and if the data is received, judging generation of collision; adding 1 to impact time slot number ck if having collision; and if no collision generation, running a successful identification process and adding 1 to the successful time slot number c1; the reader / writher judges whether a counter is equal to 2Q once completing one data identification process; and repeating the processes until all data in the frame is identified. Number n of an unidentified tag is estimated according to c0, c1 and ck, a new Q value is calculated according to the n and a time slot difference factor a, then a new identification process is performed until all tags are identified. By reasonably setting time slot difference factor, the invention enables the reader / writer to select reasonable frame length for the next frame to reduce tag collision generation and improve identification speed of the tag.

Description

technical field [0001] The invention belongs to the technical field of radio frequency identification, and in particular relates to a method for selecting a frame length in radio frequency identification, in particular to a method for selecting a frame length based on time slot randomness (ALOHA) to improve identification speed. Background technique [0002] With the increasing maturity of RFID9 (radio frequency tag identification) technology, electronic tags will be widely used in supply chain management, asset management, production management, security and anti-counterfeiting and other fields. Although RFID technology has brought great convenience to many fields, there are still some problems in the application of RFID technology. One of the main problems is that in many applications, readers are required to identify multiple targets at high speed. How to improve the anti-collision performance of readers and increase the recognition speed of readers has become one of the ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06K7/00
Inventor 王俊宇王中祥刘丹周晓方闵昊
Owner FUDAN UNIV
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