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Radio frequency identification multiple tag identification method

A technology of radio frequency identification and identification method, which is applied in the field of multi-label identification of radio frequency identification and radio frequency identification, to achieve the effect of reducing access delay, reducing collision and improving access efficiency

Active Publication Date: 2009-10-14
ZTE INTELLIGENT IOT TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The technical problem to be solved by the present invention is to provide a multi-tag identification method for radio frequency identification, solve the problem of multi-tag identification in radio frequency identification, realize fast and efficient access of multiple tags, and reduce tag collisions

Method used

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  • Radio frequency identification multiple tag identification method
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  • Radio frequency identification multiple tag identification method

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Embodiment Construction

[0031] The multi-tag identification method of the present invention will be described in further detail below in conjunction with the accompanying drawings and specific embodiments.

[0032] Such as figure 1 As shown, it shows the frame structure of the tag reply data involved in the tag identification method of the present invention, which is characterized in that: a random pulse burst area is added to the preamble of the data frame. This area is divided into several sub-time intervals again, and the tag to be sent randomly selects a sub-time interval from it, and generates a high-level burst pulse, and the rest of the pulse burst area is low-level. When a time slot starts, all replying tags send data frames synchronously, and the reader detects burst pulses within a predetermined time window and records the number, so as to determine the number of colliding tags in the current time slot.

[0033] Such as figure 2 As shown, the specific flow of the multi-tag identification...

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PUM

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Abstract

The invention discloses a multi-label identification method for radio frequency identification. After a reader initializes and selects a label, the reader sends a label access instruction, and the label replies with a certain probability according to the information in the access instruction. If the reader When a multi-tag collision is detected in a predetermined time slot, choose to send a retransmission command in this time slot or transfer to the next time slot to receive tags, wherein the retransmission command makes the collided tag in the current time slot resend the data frame, and the retransmission command The parameter information of the transmission instruction includes at least the tag reply probability information and the confirmation information of the tag reply. When selecting to transfer to the next time slot to receive the tag, update the tag reply probability information and the tag reply confirmation information in the access instruction and send the tag Access command. The method of the invention reduces label collision, improves multi-label access efficiency, and reduces access delay.

Description

technical field [0001] The invention relates to radio frequency identification technology in the field of wireless communication, in particular to a multi-label identification method for radio frequency identification. Background technique [0002] In the application of Radio Frequency Identification (RFID, Radio Frequency Identification) technology, usually one reader corresponds to multiple electronic tags. When multiple tags are connected to the reader at the same time, collisions will occur, so the information in the tags cannot be correctly transmitted to the reader. Therefore, certain mechanisms need to be adopted to avoid collisions or reduce collisions. [0003] In order to access tags quickly and effectively, in the current international standard ISO 18000-6, the method of ALOHA and Binary Tree is adopted to solve the collision in tag access. Among them, the basic feature of ALOHA is that the system divides the channel for tag replies into several intervals accord...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G06K7/00
Inventor 王宏刚
Owner ZTE INTELLIGENT IOT TECH