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Time slot scanning anti-collision method based on collision precheck

An anti-collision and time-slot technology, applied in the field of radio frequency communication, can solve the problems of collision, low efficiency, and inability to obtain label information, and achieve the effect of avoiding collision, improving efficiency and improving recognition speed.

Active Publication Date: 2012-08-01
NAT UNIV OF DEFENSE TECH
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AI Technical Summary

Problems solved by technology

[0003] A common problem faced by radio frequency identification systems and other typical radio frequency communication systems is: the need to solve the collision problem of simultaneous communication between multiple devices in the same system
[0009] However, in the above algorithms, the reader needs to count all the time slots. In fact, many time slots are occupied by multiple tags at the same time, and some time slots are not occupied by any tags. It is impossible to obtain any label information through slot counting, so this method of counting time slots one by one is not efficient

Method used

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  • Time slot scanning anti-collision method based on collision precheck
  • Time slot scanning anti-collision method based on collision precheck
  • Time slot scanning anti-collision method based on collision precheck

Examples

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Embodiment Construction

[0043] figure 1 It is the process flow of the anti-collision method proposed by the present invention, which specifically includes the following 6 steps:

[0044] Step 1: Initialize

[0045] Step 2: The reader sends a query command

[0046] Step 3: The reader establishes a collision pre-check sequence

[0047] Step 4: Tag adjusts slot count value

[0048] Step 5: The reader recognizes no collision tags

[0049] Step 6: The reader adjusts the frame time slot length.

[0050] A specific embodiment of the present invention is as follows: Matlab is used for simulation, 8 tags are numbered from tag 1 to tag 8, assuming that the slot counter length of the tag is 16 bits.

[0051] Step 1: Initialization.

[0052] The inventory flags of all tags are initialized to uncounted. The reader sets the frame time slot length L, which is 10 in this example.

[0053] Step 2: The reader sends a query command.

[0054] The reader sends a query command with L as a parameter to the tags wi...

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Abstract

The invention provides an anti-collision method used in a radio-frequency identification system for realizing the communication between a single reader writer and multiple tags. The technical scheme comprises the following six steps: 1, initialization is carried out; 2, the reader writer sends an inquiry command; 3, the reader writer establishes a collision precheck sequence; 4, the tags adjust the time slot count value; 5, the reader writer identifies tags not subjected to collision; and 6, the reader writer adjusts the frame time slot length. By combining the empty time slot scanning technology and the short-frame collision detection technology, the invention omits the check of the reader writer on idle time slots and time slots occupied by the multiple tags, thereby improving the multi-tag identification efficiency of the system.

Description

technical field [0001] The invention belongs to the technical field of radio frequency communication, and in particular relates to a method applied in a radio frequency identification system to solve communication collisions between a reader-writer and a tag. Background technique [0002] Radio Frequency Identification (RFID) communication technology is a non-contact automatic identification technology. In the RFID system, the reader communicates with several tags through radio frequency signals, and obtains the identification information stored on each tag. [0003] A common problem faced by radio frequency identification systems and other typical radio frequency communication systems is that it needs to solve the collision problem of simultaneous communication between multiple devices in the same system. For the radio frequency identification system, it mainly solves the collision problem of communication between a single reader and multiple tags. And limited by the fact...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G06K7/00G06K17/00
Inventor 王宏义李建成庄钊文任天鹏许拔陈柯
Owner NAT UNIV OF DEFENSE TECH
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