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Multi-label anti-collision algorithm in ultrahigh frequency remote auto-recognition system

A technology of automatic identification system and anti-collision algorithm, which is applied in the field of multi-label reading, can solve the problems of low identification label efficiency and achieve the effect of overcoming the low efficiency of label identification, realizing no omission reading, and improving the reading efficiency

Active Publication Date: 2007-08-08
BEIMING SOFTWARE
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Problems solved by technology

Modeling simulation analysis and practical tests show that the above method is very inefficient in identifying tags when the number of tags is too large

Method used

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  • Multi-label anti-collision algorithm in ultrahigh frequency remote auto-recognition system
  • Multi-label anti-collision algorithm in ultrahigh frequency remote auto-recognition system

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Embodiment Construction

[0016] The following examples are further explanations and illustrations of the present invention, and do not constitute any limitation to the present invention.

[0017] The multi-label anti-collision algorithm in the ultra-high frequency long-distance automatic identification system of the present invention is used in the EPCGNE2 (second-generation electronic article code) reader-writer, and it is an important link that affects the performance of the reader-writer.

[0018] As shown in Figure 1, in this algorithm, the dynamic adjustment and determination of Q value is the core of this algorithm. Different from the existing algorithm, this algorithm dynamically adjusts the Q value according to the data collision situation returned by the tag, which includes the following steps:

[0019] a. Take the preset Q value as 4;

[0020] b. After the process starts, the reader is initialized to 0, then sends the QUERY command and receives the tag return, if there is no return, no proc...

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Abstract

It's a multi-label anti-collision algorithm about ultra-high frequency long-range automatic identification system, which dynamically adjusts the Q value based on data labels to the collision. It includes the following steps: a. Default value of Q is 0 to 15; B. Reader sends QUERY (inquiries) commands and receives labeling return; c. Reader sent two Q-th-QUERY REP (Inquiry Response) command; d. After steps a, b, c, if collision count is 0 reading labels is over the next QUERY order Q value is determined in accordance with the collision and repeat steps a, b and c. Dynamic Q value is determined by the following methods: a. Estimate the number of labels; B. According to the estimates of the number of labels and calculating the probability of computing power and exponential, to seek to end the two index to get the new Q value. The invention can be realized UHF remote automatic identification system of multi-tag reading without completely omitted, and the reader has high efficiency.

Description

【Technical field】 [0001] The invention relates to a multi-label reading technology in the field of communication technology, in particular to a multi-label anti-collision algorithm in an ultra-high frequency long-distance automatic identification system. 【Background technique】 [0002] In the UHF long-distance automatic identification system used in the field of wireless communication, EPC GNE2 (second-generation electronic article encoding) reader has begun to be applied. In the design of EPC GNE2 reader, multi-(electronic) tag anti-collision algorithm is an important link. The multi-label anti-collision algorithm of EPC GEN2 mainly has two reference indicators: reliability and efficiency. In the whole anti-collision algorithm, the determination of Q value is the most critical part. In the existing published algorithms, the Q value is usually determined by the following process: initialize the Q value to 4, continuously use the Query command to search, and add or subtract...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06K7/00
Inventor 苏四友高军
Owner BEIMING SOFTWARE
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