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Adaptive dual-mode blocking collision-prevention method

A dual-mode, anti-collision technology, used in instruments, computer parts, and collaborative devices, etc., can solve problems such as collision and low performance, and achieve the effect of avoiding idle time slots, high working performance, and shortening recognition time.

Inactive Publication Date: 2012-12-19
ZHEJIANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the problem with this method is that there will be collisions between resident tags and newly imported tags. When the number of resident tags is large, the performance of this method will be relatively low.

Method used

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  • Adaptive dual-mode blocking collision-prevention method
  • Adaptive dual-mode blocking collision-prevention method
  • Adaptive dual-mode blocking collision-prevention method

Examples

Experimental program
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Embodiment

[0074] Suppose there are N=100 tags, and 50 tags are identified in the i-th frame. Then at the i+1th frame, some of the 50 tags may stay and some will move out, and at the same time, some of the other 50 unidentified tags will move into the recognition range of the reader. Now assume that the migration rate is 0.5, that is, 25 labels have migrated in.

[0075] Both the ABS method and the SRB method are derived from the binary tree method BT method. For the BT method, the identification method is the same regardless of the number of moving-in and resident tags, and the total number of time slots to be identified is:

[0076] (1)

[0077] In the above formula, Ti represents the i-th frame, D represents the delay, which is the number of time slots required, and n is the number of tags to be identified. Then similarly, the number of time slots required by the ABS method is

[0078] (2)

[0079] Under the premise of identifying n tags in the i-th fram...

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Abstract

The invention discloses an adaptive dual-mode blocking collision-prevention method. In the method, the number of immigratory tags and the number of resident tags in a frame are recorded respectively, and the residence rate of the frame is calculated; and based on the residence rate ps, two operating modes are combined to avoid collisions among the resident tags and simultaneously reduce the collisions between the resident tags and the immigratory tags. The method has the characteristics of high identification speed and fewer idle time slots, and the performance of a system is greatly improved.

Description

technical field [0001] The invention relates to a tag anti-collision method in a radio frequency identification (RFID) system, in particular to a dual-mode blocking anti-collision method. Background technique [0002] Radio frequency identification technology (RFID) is a non-contact automatic identification technology. Its basic principle is to use radio frequency signals and space coupling transmission characteristics to realize automatic identification of identified objects. The rise of automatic identification technology provides computers with an effective means of fast and accurate data collection and input, and as a leading high-tech, it is quickly accepted by people. The technology has numerous applications, including logistics, access control, transportation, pet management, library management, and electronic archives, to name a few. [0003] Since there is no real RFID product standard at present, it has caused confusion and isolation of RFID products in different ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G06K17/00
Inventor 马力沈海斌赵宇
Owner ZHEJIANG UNIV
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