Journal of Jilin University(Engineering and Technology Edition) ›› 2021, Vol. 51 ›› Issue (5): 1830-1837.doi: 10.13229/j.cnki.jdxbgxb20200808

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Bi⁃direction segmented anti⁃collision algorithm based on query tree

Hong-wei ZHAO1,2(),Zi-jian ZHANG1,Jiao LI3(),Yuan ZHANG1,Huang-shui HU4,Xue-bai ZANG1   

  1. 1.College of Computer Science and Technology，Jilin University，Changchun 130012，China
    2.Key Laboratory of Symbolic Computation and Knowledge Engineering of Ministry of Education，Jilin University，Changchun 130012，China
    3.Library，Jilin University，Changchun 130012，China
    4.School of Computer Science and Engineering，Changchun University of Technology，Changchun 130012，China
  • Received:2020-10-22 Online:2021-09-01 Published:2021-09-16
  • Contact: Jiao LI E-mail:zhaohw@jlu.edu.cn;lijiao@jlu.edu.cn

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Abstract:

Focusing on the problem of the low system efficiency caused by multi-tags collision of RFID system， this paper proposes an anti-collision algorithm based on query tree， intended to reduce system energy consumption and improve communication efficiency. The method divides the tags into two groups and segments the IDs so that the tags respectively respond to the prefix and suffix in the query command and only transmit the partial ID sequence of the query segment according to the state code. Compared with the traditional query tree algorithm， the algorithm significantly reduces the transmission of bits useless for identification， eliminates idle time slots， and improves system throughput. Theoretical analysis and simulation results show that the proposed algorithm performs better than the existing query tree anti-collision algorithm and helps to design an efficient RFID identification system.

Key words: computer application technology, radio frequency identification, anti-collision algorithm, bi-direction, pre identification

CLC Number: 

  • TP393

Table 1

Example of QT"

时隙查询前缀响应时隙状态
1εxxxx碰撞
200xx碰撞
31x0x碰撞
400xx碰撞
501-空闲
61001识别A
71100识别B
80001识别C
90010识别D

Fig.1

Query command and samples of queries and corresponding responses of bidirectional algorithm"

Table 2

Example of bidirectional query algorithm"

时隙查询命令标签响应数据时隙状态
PrefixSuffixState_PState_S
10ε00xxxxx0x碰撞
20111110x10P预识别“0110”，S预识别“0101”、“1101”
3011011012201001100P识别E，S识别D
400010112x01011P预识别“0000”、“0001”，S识别F
50001021xxxx100S预识别“1000”
6000111000220011001P识别G
700010ε23110P识别C
80000ε231011P识别A

Fig.2

Collision tree of segmented query algorithm"

Fig.3

Flow chart of BDS algorithm"

Fig.4

Changes in average transmitted bits of BDS with length of segment point increasing"

Fig.5

Transmitted bits for one tag identification of BDS with different lengths of segment points"

Fig.6

Throughput rate of different algorithms"

Fig.7

Transmitted bits for one tag identification of different algorithms"

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