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A method to improve the accuracy of uhf-rfid anti-collision algorithm stocktaking end threshold

A technology of UHF-RFID and anti-collision algorithm, applied in the field of radio frequency identification, can solve problems such as inventory errors, achieve the effect of increasing the number of tags and reducing invalid inventory processes

Inactive Publication Date: 2018-01-16
中交北斗技术有限责任公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] The purpose of the present invention is to provide an improved UHF-RFID multi-label anti-collision tree algorithm and its application to solve the problem of inventory errors caused by the coincidence of tag random numbers in the current tree-type anti-collision algorithm, and to improve the threshold for inventory completion accuracy

Method used

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  • A method to improve the accuracy of uhf-rfid anti-collision algorithm stocktaking end threshold
  • A method to improve the accuracy of uhf-rfid anti-collision algorithm stocktaking end threshold
  • A method to improve the accuracy of uhf-rfid anti-collision algorithm stocktaking end threshold

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Effect test

example example 1

[0042] Take 4 tags as an example, numbered from tag 1 to tag 4. combine figure 1 The present invention is described:

[0043] Step 1: The reader sends a Query command, starts the inventory cycle, and waits for the tag to send a response packet within the specified time slot.

[0044] The reader-writer side first sets each initialization parameter, the variable end threshold Smax=2, the number of consecutive collisions CC=0 and the number of consecutive idle times CI=0 during the inventory process, and the immutable thresholds of the number of consecutive collisions CCN=3 and The continuous idle times threshold CIN=2, and the RN11 record that has been inventoried is set at the reader-writer end.

[0045] Step 2: After receiving the Query command, the tag sets the values ​​of the 4 time slot counters to 0, and then sends a handle to the reader.

[0046] Step 3: The reader receives 4 tag handle replies within the specified time slot, and an unidentifiable bit appears. The read...

Embodiment 2

[0069] Take the number of tags as 500, and use Matlab simulation for the original DDS-BT algorithm. After the 581st Shrink command, the value of the maximum slot counter will be the same as the inventory end threshold, and it will remain until the end of all tag inventory. Thus, the inventory end threshold ends up being wrong. As shown in Table 2, the DDS-BT detailed inventory process of the present invention is not combined with Matlab simulation, and the number of tags is 500.

[0070] Table 2 is not combined with the DDS-BT detailed inventory process of the present invention

[0071]

[0072] Combine the DDS-BT algorithm with the present invention, such as figure 1As shown, that is, when the current inventory end threshold is 0 and the current command is QueryRep, the inventory end threshold is no longer reduced by 1, but reset to 0. After the DDS-BT algorithm is combined with the present invention, there is no error in the stocktaking end threshold value during each M...

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Abstract

The invention discloses an improved UHF-RFID multi-tag anti-collision tree algorithm and application thereof, belongs to the technical field of radio frequency identification, mainly solves a problem of erroneous check due to tag random number superposition of a tree anti-collision algorithm widely used currently. The algorithm comprises steps of: adding a checked tag random number record on a reader-writer end and changing a part of determination conditions; adding a checking command for correcting tag random number superposition; and for the DDS-BT of a UHF-RFID national standard, improving a part of check end threshold operation. The algorithm can be widely used in anti-collision algorithm related to tag response random numbers, is especially suitable for cases where a large number of tags are simultaneously identified, may greatly reduce ineffective check cyclic processes, and greatly increases the number of tags that can be simultaneously checked.

Description

technical field [0001] The invention relates to the technical field of radio frequency identification, in particular to an improved UHF-RFID multi-label anti-collision tree algorithm and its application. Background technique [0002] Radio Frequency Identification (RFID) technology is a non-contact automatic identification technology that uses radio frequency communication as the medium to automatically identify and exchange data on target objects through spatial coupling. The core components of the RFID system are readers and electronic tags. According to the working frequency, they can be divided into different types such as low frequency (LF), high frequency (HF), ultra high frequency (UHF), and microwave (MW). Can be divided into passive, active and semi-active three. Among them, because UHF-RFID has the advantages of high carrier frequency (800M / 900M), long communication distance (several meters to tens of meters), passive tags, and fast reading and writing speed, it i...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G06K17/00
Inventor 陈昊王杨安锡文
Owner 中交北斗技术有限责任公司
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