Anti-collision method of wireless passive sensing system based on multi-way tree

A wireless passive, sensor system technology, applied in the direction of induction record carriers, instruments, computer parts, etc., can solve the problems of prone to error code, long response time sequence, etc., to achieve the use of less resources, simple logic, easy to implement Effect

Inactive Publication Date: 2011-06-22
ZHEJIANG UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Relatively speaking, the theoretical performance of the binary tree algorithm is better than that of the Aloha algorithm, but the binary tree method requires tags to reply a large number of binary ID codes, and the response time sequence is long, which is prone to error codes

Method used

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  • Anti-collision method of wireless passive sensing system based on multi-way tree
  • Anti-collision method of wireless passive sensing system based on multi-way tree
  • Anti-collision method of wireless passive sensing system based on multi-way tree

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Embodiment

[0086] In order to describe the operation process of this method more clearly, the following examples and attached Figure 4 The present invention is described in detail.

[0087] Assume that there are 6 sensor tags, and their binary ID numbers are 12 digits, and they are queried in the form of a hexadecimal tree, that is, hexadecimal. The binary ID numbers and hexadecimal ID numbers of the six sensor tags are as follows:

[0088] Sensor number one label: 001001100011 (binary), 263 (hexadecimal);

[0089] Sensor number two label: 001001001010 (binary), 24A (hexadecimal);

[0090] Sensor No. 3 label: 101100101001 (binary), B29 (hexadecimal);

[0091] Sensor No. 4 label: 110111000001 (binary), DC1 (hexadecimal);

[0092] Sensor No. 5 label: 001001000111 (binary), 247 (hexadecimal);

[0093] Sensor number six label: 110111001000 (binary), DC8 (hexadecimal).

[0094] The execution steps of this method in this example are as follows:

[0095] 1. The reader sends an initializ...

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Abstract

The invention discloses an anti-collision method of a wireless passive sensing system base on a multi-way tree, which is applied in the wireless passive sensing system including a single reader and a plurality of sensor labels. The reader sends out initialization commands, after the sensor labels are activated and initialized, an ID number of the sensor labels is in a form of an m carry system tobe expressed as a K bit, and the reader inquires each ID number of the m carry system of the sensor labels to be recognized from high position to low position in sequence; if the reader detects that the collision exists in a certain ID number of the m carry system of the sensor labels, each value with collision are turned and inquired in sequence; the state switch and the parameter change for each command of the reader are performed through the sensor labels according to the states and parameters thereof. The invention reduces the inquiry frequency and reduces the error ratio; in addition, the logic of the sensor labels during the recognition process is simple, and the power consumption is low.

Description

technical field [0001] The invention relates to wireless passive sensing technology, in particular to an anti-collision method for a wireless passive sensing system based on a multi-fork tree. Background technique [0002] Wireless passive sensor system is an emerging research direction, which has broad application prospects and high application value. The wireless sensors at this stage are mainly wireless active sensors, and this technology uses the sensor tag's own battery for power supply. Due to the limited battery power, especially in some harsh environmental conditions, the working life will be greatly reduced, so the passiveization of sensor tags is an ideal development trend of wireless sensor systems. [0003] At present, the research of wireless passive sensing system mainly includes SAW (Surface Acoustic Wave) sensing system and RFID (Radio Frequency Identification) tag type wireless passive sensing system. When SAW propagates on the surface of the piezoelectric...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G06K7/00
Inventor 孙旦戴华平石焕许煜
Owner ZHEJIANG UNIV
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