Anti-collision method, device, computer-readable storage medium and equipment of RFID system

An anti-collision and identification technology, applied in the field of radio frequency identification, can solve the problems of reducing the amount of one-time identification of the system, limited data frame length, and low throughput rate

Active Publication Date: 2021-09-10
SHANDONG JIANZHU UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] However, the Framed Slotted ALOHA (Framed Slotted ALOHA, FSA) algorithm has the following disadvantages: when the number of tags is much larger than the number of slots in the data frame, the possibility of tag collision increases; when the number of tags is much smaller than the number of slots in the data frame time slot waste
[0008] However, the length of the data frame that the reader can provide is limited (the maximum is N max =256), when the number of tags within the reading range of the reader is much greater than the maximum length of the data frame, the recognition efficiency of the dynamic frame time slot ALOHA algorithm drops sharply
Therefore, the concept of grouping dynamic frame time slots is proposed, and each group of tags is identified in turn, which reduces the amount of one-time identification of the system, but the throughput rate of this algorithm is still not high, about 30%, and all ALOHA Algorithms are random, and there will always be some labels that cannot be identified, that is, there is a "label starvation" problem

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  • Anti-collision method, device, computer-readable storage medium and equipment of RFID system
  • Anti-collision method, device, computer-readable storage medium and equipment of RFID system
  • Anti-collision method, device, computer-readable storage medium and equipment of RFID system

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Embodiment 1

[0067] An embodiment of the present invention provides an anti-collision method for an RFID system. The RFID system mainly includes a tag to be identified, a reader, and a background management system. The tag to be identified is equipped with a random number generator T and a random number storage S, which is installed on the material or employee card; the reader is installed on the workstation, and transmits the data it reads to the controller through zigbee wireless technology , and receive the commands issued by the computer from the controller; the management system includes the controller and the computer, the controller and the reader communicate through the zigbee wireless network, and connect with the computer through RS232.

[0068] Such as figure 1 As shown, the method of the embodiment of the present invention includes:

[0069] Step S100: Estimate the number n of tags to be identified, group the tags to be identified according to the number n of tags to be identi...

Embodiment 2

[0102] The embodiment of the present invention provides a kind of anti-collision device of RFID system, such as Figure 4 As shown, the device includes:

[0103] The grouping module 10 is used to estimate the number n of tags to be identified, group the tags to be identified according to the number n of tags to be identified, and determine the length of the data frame corresponding to each group of tags to be identified according to the number of tags to be identified in each group.

[0104] The current group initialization module 20 is used to select a group of unrecognized tags to be identified as the current group, and determine the initial value of the time slot parameter Q and the number of frame time slots M according to the number of tags to be identified in the current group, wherein Q's The value of the initial value should satisfy the data frame length 2 Q It is closest to the number of tags to be identified in the current group, and the initial value of M is 2 Q ....

Embodiment 3

[0127] The method or device described in the above-mentioned embodiments provided in this specification can implement business logic through a computer program and record it on a storage medium, and the storage medium can be read and executed by a computer to achieve the effect of the solution described in Embodiment 1 of this specification . Therefore, the present invention also provides an anti-collision computer-readable storage medium for an RFID system, including a processor and a memory for storing processor-executable instructions. When the instructions are executed by the processor, the RFID system of Embodiment 1 is implemented. The steps of the anti-collision method.

[0128] The method adopted in the embodiment of the present invention continues the advantages of the dynamic frame time slot ALOHA algorithm, which is highly versatile and easy to implement, and at the same time solves the problem that some tags in the dynamic frame time slot algorithm cannot always be...

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Abstract

The invention discloses an anti-collision method, device, computer-readable storage medium and equipment of an RFID system, belonging to the technical field of radio frequency identification. The method includes: Step S100: Estimate the number of tags and group the tags; Step S200: Determine the time slot parameter according to the number of tags in the current group; Step S300: Send a command with time slot parameters to the tag, and the tag receives the command Then generate a random number as the time slot value; step S400: open three time slots each time and receive the response signal of the tag at the same time, and mark the time slot as an idle time slot, a successful time slot or a collision time slot according to the situation of the response signal; step S500: Adjust time slot parameters according to the number of free time slots, successful time slots and collision time slots; if the number of successful time slots is 0, return to step S200; otherwise, return to step S300. The invention has high versatility, is simple and easy to implement, solves the label starvation problem, reduces the possibility of label collision, improves system identification efficiency, and optimizes system performance.

Description

technical field [0001] The invention relates to the technical field of radio frequency identification, in particular to an anti-collision method, device, computer-readable storage medium and equipment of an RFID system. Background technique [0002] RFID refers to radio frequency identification technology (Radio Frequency IDentification), which identifies the information in the electronic tag through spatial coupling, and feeds back the acquired information to the reader to realize the data exchange between the reader and the electronic tag. This technology has the advantages of high safety, anti-pollution, fast recognition speed, large data capacity, fast and convenient reading, and dynamic change of label data. It has been widely used in logistics transportation, personnel management, automated production and other fields. [0003] During the identification process of the RFID system, it is often the case that multiple tags send information to the reader at the same time. ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G06K7/10
CPCG06K7/10029
Inventor 李艳萍高焕兵隋守刚王琪朱青
Owner SHANDONG JIANZHU UNIV
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