A multi-attribute query method in wireless sensor network

A wireless sensor and query method technology, applied in the field of wireless sensor networks, can solve problems such as not being considered, and achieve the effect of low energy consumption and efficient query

Inactive Publication Date: 2018-10-02
GUANGDONG UNIV OF PETROCHEMICAL TECH
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, for multi-attribute queries, especially when some attributes are of interest, sensor data collection that only selectively considers one or more attributes is not considered.

Method used

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  • A multi-attribute query method in wireless sensor network
  • A multi-attribute query method in wireless sensor network
  • A multi-attribute query method in wireless sensor network

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specific Embodiment approach

[0068] According to the above-mentioned basic invention design ideas, the specific implementation steps can be obtained as follows:

[0069] 1) Define sensor nodes and grid cell classes.

[0070] Construct a sensor node class, including node horizontal and vertical coordinates and attributes; construct a grid unit class, including a collection of sensor nodes and inverted files in the grid. First, sensors with different properties are randomly skewed in space, such as image 3 In order to facilitate the introduction of the index tree construction process, only 10 sensor nodes are used as an example. The sensor nodes in the entire region are distributed in two relatively dense regions (bottom left and top right), and two relatively sparse regions (top left and bottom right).

[0071] 2) Grid the sensor network area.

[0072] Divide the entire area into grids of equal size. These grids are all squares, and the side lengths of the grids are all √2r, where r is the radius of the informat...

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Abstract

The present invention discloses a multi-attribute query method in wireless sensor networks. The method comprises the following steps: (1) setting a query region and a query attribute according to user needs; (2) initializing a query node into a root node based on an index tree; (3) judging whether the node contains a required query sensor or not according to an inverted file; if not, ending the query of the node; if the root node queried at the beginning does not contain the sensor with a required query attribute, directly exiting the query and returning a null result; if the required query sensor is contained, judging whether the node is a leaf node or not; if so, writing the queried sensor data in a query result set; if the node is not the leaf node, continuing to query a left and a right child nodes of the node, and using the left and the right child nodes as query nodes to continue the query operation; and (4) returning the query result set to obtain the sensor data with the required query attribute in the required query region. The multi-attribute query method in wireless sensor networks is low in energy consumption and high in query efficiency.

Description

Technical field [0001] The invention relates to a multi-attribute query method in a wireless sensor network. In a wireless sensor network (WSN) with uneven sensor distribution, it can query single-attribute or multi-attribute sensor data with low energy consumption, and belongs to wireless sensors under the Internet of Things Network technology field. Background technique [0002] WSN applications in real life, according to the specific needs of specific users, may include sensor nodes with different types of attributes in a specified field, and these sensor nodes are combined to achieve the needs of the user. At this time, the WSN is also a wireless sensor network (HWSN, Heterogeneous Wireless Sensor Networks) composed of multi-attribute sensors. In this HWSN, users may only be interested in sensors with specific attributes in some areas according to application requirements. Therefore, how to selectively collect multi-attribute sensor data with high efficiency and low energy ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04W84/18G06F17/30
CPCG06F16/901G06F16/9024G06F16/903H04W84/18Y02D10/00Y02D30/70
Inventor 周长兵赵登舒磊
Owner GUANGDONG UNIV OF PETROCHEMICAL TECH
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