A hybrid anti-collision approach for high-capacity multi-tag RFID systems
A multi-label, large-capacity technology, applied in the field of radio frequency identification, can solve the problems of low recognition rate and instability of anti-collision methods, and achieve the effects of eliminating idle queries, narrowing the range, and reducing computational complexity
Active Publication Date: 2016-11-02
UNIV OF ELECTRONICS SCI & TECH OF CHINA
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[0006] The purpose of the present invention is to propose a hybrid anti-collision method suitable for large-capacity multi-label RFID systems in order to solve the shortcomings of low recognition rate and instability in the anti-collision method in the prior art. The method is stable, efficient and scalable
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[0044] The present invention will be further elaborated below in conjunction with the accompanying drawings and specific embodiments.
[0045] Such as figure 1 Shown is a flow chart of a hybrid anti-collision method for a large-capacity multi-label RFID system of the present invention, specifically comprising:
[0046] Step 1: The reader is initialized and cleared, and the values of the reader's time slot counter Sc, the number of idle time slots Ne, the number of collision time slots Nc and the number of successful time slots Nr are all 0;
[0047] Step 2: The reader broadcasts a Query command to the tags within its coverage, and the Query command specifies a fixed-length time slot frame L=2 Q , reader-writer time slot counter Sc=Sc+1;
[0048] Step 3: The tag to be identified within the coverage of the reader-writer receives the Query command from the reader-writer, extracts the Q value in the command, and the Q value is the time slot frame L=2 in the step 2 Q The Q val...
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The invention discloses a hybrid collision preventing method for a high-capacity multi-label RFID system. The method can mainly be divided into two phases, the first phase is a frame time slot utilizing separation and recognition phase, and the second phase is an AMS method utilizing recognition phase. The method can improve the label recognition performance, and narrow down the label query range every time. Meanwhile, an AMS method is adopted to eliminate free query and reduce the collision frequency, and recognition efficiency and safety performance are improved. Meanwhile, the advantages of an ALOHA-based method and a tree-based method are combined, the problem of label lack caused by inaccuracy of the random process is solved, the free query in a traditional tree-based method is eliminated, meanwhile, the number of labels does not need to be estimated, and computation complexity is lowered. The limit of the traditional method on the number of the labels is broken through, and the method is suitable for the high-capacity multi-label RFID system.
Description
technical field [0001] The invention belongs to the technical field of radio frequency identification, and in particular relates to the design of a hybrid anti-collision method for a large-capacity multi-label RFID system. Background technique [0002] In recent years, due to the advantages of long distance, passive tags, long service life, and fast tag reading and writing speeds, UHF RFID systems have become the main development trend of future RFID applications, such as: supply chain management, item tracking, etc. In addition, the UHF RFID system has a wide range of readers, and the number of tags covered in the system is large. At the same time, the requirements for reading and writing of tags are very high, which makes the tag collision problem of the UHF RFID system more prominent. In order to solve the collision problem caused by multiple tags communicating with the reader at the same time, the reader needs to use an anti-collision method to coordinate the communicati...
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IPC IPC(8): G06K7/00
Inventor 苏健文光俊李建
Owner UNIV OF ELECTRONICS SCI & TECH OF CHINA