Tag anti-collision method based on self-adaptive hybrid query tree in RFID (radio frequency identification) system

An anti-collision, query tree technology, applied to inductive record carriers, special data processing applications, instruments, etc., can solve the problem of inability to solve the problem of conversion to ternary, not considering the problem of label movement, difficult tree structure and other problems, Achieve the effect of reducing the number of queries, reducing the idle process and collision process, and reducing the label response delay

Inactive Publication Date: 2012-09-12
NORTHWESTERN POLYTECHNICAL UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

P.Mathys pointed out in his literature that using the query tree method constructed by the ternary tree can achieve the best performance, but it cannot solve the problem of converting the label electronic product code EPC binary to ternary, which hinders the formation of the tree structure. It caused certain difficulties, and most of the methods did not consider the movement of labels, which also caused certain difficulties for practical applications.

Method used

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  • Tag anti-collision method based on self-adaptive hybrid query tree in RFID (radio frequency identification) system
  • Tag anti-collision method based on self-adaptive hybrid query tree in RFID (radio frequency identification) system
  • Tag anti-collision method based on self-adaptive hybrid query tree in RFID (radio frequency identification) system

Examples

Experimental program
Comparison scheme
Effect test

example 1

[0060] Select Tag's EPC 2 The code is (000000), (001010), (001110), (011000), (100111) and (110111), and convert from binary to ternary to get EPC 3 The codes are (0000), (0102), (0120), (1000), (1121) and (2021). The initial query request in the queue Q is {0, 1, 2}, and the query request '0' is sent to all tags. Assuming that the 6 tags are within the communication range of the reader, at this time, tags 1, 2, and 3 respond, and the '0' goes to yQ 2 , and append {0, 1, 2} after '0' to form a new query request and add it to Q. At this time, the query request in Q is {1, 2, 00, 01, 02}, and then continue to query. Send query request '1', at this time Tag4, 5 respond, then attribute '1' to yQ 2 , and append {0, 1, 2} after ‘1’ to form a new query request and add it to Q,

[0061] At this time, the query request in Q is {2, 00, 01, 02, 10, 11, 12}, and then continue to query. Send a query request '2', and only Tag6 responds at this time, then attribute '2' to yQ 1 , delete...

example 2

[0067] Select Tag's (EPC) 2 The codes are (00000), (00110), (00111), (01100), (10011) and (11001), and the integer multiples of 3 are converted to ternary, and the rest remains unchanged, and the corresponding codeword is ( 00 00), (01 10), (01 11), (10 00), (11 11) and (20 01). For the remaining part, the binary query tree processing method is only different when the query request is reconstructed. For example, when processing the '01' request, it is found to be a collision process, add the {010, 011} query request sequence to Q, and identify '010' as an idle process and add yQ 3 , and ‘011’ is the collision process, continue to add the {0110, 0111} query request sequence to Q, both requests are identifiable processes, add yQ 1 middle. image 3 (a) is the tree recognition process of example 2, image 3 (b) is the query result of example 2.

[0068] 4. Set the adaptive method in the hybrid query tree

[0069] (1) Tag adding mechanism: new tags are only identified in the ...

example 3

[0077] like Figure 4 As shown in Figure (a), in the child nodes '00, 01, 02' of the '0' node, it can be found that '00, 01' is an idle node, and '00' is an identifiable node, which is consistent with (a) Therefore, the parent node '0' is considered to be an identifiable node, and the query request for the child nodes '00, 01, 02' is canceled. (b) In the figure, the child nodes '00, 01, 02' of the node '0' are all idle nodes, which conform to point (b), so the parent node '0' is considered to be an idle node, and the child node is cancelled. 00, 01, 02' query request. (c) Figure, in the child nodes '010, 011' of the node '01', it can be found that '010' is an idle node, and '011' is an identifiable node, which conforms to point (c), so it is considered that its father' Node 01' is an identifiable node, and the query request for child nodes '010, 011' is cancelled. (d) In the figure, the child nodes '010 and 011' of the node '01' are all idle nodes, and its parent node '01' ...

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Abstract

The invention relates to a tag anti-collision method based on a self-adaptive hybrid query tree in an RFID (radio frequency identification) system. The tag anti-collision method includes firstly, establishing a binary-to-ternary conversion method for electronic product codes (EPCs) of electronic tags, secondly, providing a method for constructing a ternary query tree to identify the tags, thirdly, valuing according to lengths of the EPCs to construct the hybrid query tree method to solve the problem of coexistence of a binary tree and a ternary tree, and finally, setting entry and departure mechanisms to acquire the tag anti-collision method of the self-adaptive hybrid query tree according to mobility of the tags. The tag anti-collision method based on the self-adaptive hybrid query tree in the RFID (radio frequency identification) system has the advantages that the ternary tree method has optimized performance in the tag anti-collision method based on a tree structure, the problem that complete ternary conversion of the EPCs fails is solved, the difficulty in identifying the moving tags is overcome, time delay of identification is shortened well, and the colliding and idling processes are reduced. In addition, the tag anti-collision method is suitable for RFID scenes with large-scale movable tags.

Description

technical field [0001] The invention belongs to the field of radio frequency identification RFID communication, and relates to an anti-collision method applied in an RFID system, in particular to a label anti-collision method based on an adaptive hybrid query tree in the RFID system. Background technique [0002] Radio Frequency Identification (RFID) is a non-contact automatic identification technology that automatically identifies target objects and obtains relevant data through radio frequency signals. RFID can work in harsh environments, does not require manual intervention, has high-speed and accurate identification, low cost, and long life. It is one of the emerging technologies with the fastest development and greatest potential. It is called the third-generation identification technology. [0003] Since the reader and the tag share the wireless channel for communication, when multiple adjacent readers query a tag at the same time, the tag cannot identify the query, re...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06K7/00G06F17/30
Inventor 蒋毅赵洪钢程伟
Owner NORTHWESTERN POLYTECHNICAL UNIV
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