Method for evaluating link quality of wireless sensor network

Abstract

The invention discloses a method for evaluating the link quality of a wireless sensor network. The decomposing the wireless sensor network, the link quality evaluation is abstracted into a multi-attribute decision making process. Link transmission efficiency, a link fluctuation degree and received signal strength are selected as evaluation attributes of the link quality. A packet reception rate, asignal-to-noise ratio mean square error and a received signal strength mean are respectively used for quantifying the evaluation attributes, and the missing information is filled with a minimum value. Considering the complexity of the link environment and the inconsistency of link quality standards, a horizontal method is used for performing fuzzification on link quality information within multiple detection periods, an improved entropy method is used for calculating the influence degree of each evaluation attribute on the link quality, and the evaluation attributes are comprehensively evaluated by using an improved ideal solution to measure the link quality with relative closeness. The method has the advantages that the complexity of the link environment and the inconsistency of the linkquality standards are considered in the fuzzification method, so that the evaluation result of the link quality is more reliable.

Description

technical field [0001] The invention relates to the technical field of wireless sensor network link quality assessment, in particular to a wireless sensor network link quality assessment method. Background technique [0002] As the collection part of the Internet of Things perception information, the wireless sensor network provides guarantee for the implementation of various functions of the Internet of Things, and is widely used in the identification, positioning, tracking of objects, real-time monitoring and intelligent management of the physical world, etc. [0003] Sensor nodes are limited by energy, storage, and communication capabilities, and are affected by noise, interference, and multipath effects in the environment, resulting in extremely unreliable link quality between nodes. [0004] Generally, link quality can be obtained in two ways: one is to count the data packets received within a certain period of time. The link quality obtained by this method can smooth l...

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Problems solved by technology

[0003] Sensor nodes are limited by energy, storage, and communication capabilities, and are affected by noise, interference, and multipath effects in the environment, resulting in extremely unreliable link quality between nodes.

[0004] Generally, link quality can be obtained in two ways: one is to count the data packets received within a certain period of time. The link quality obtained by this method can smooth link fluctuations, but it is not timely enough to reflect the changes in the link , the evaluation results are not comprehensive enough, which affects the reliability of the link quality evaluation results; the second is obtained from the physical characteristics of the wireless link at a certain moment, and the link quality obtained by this method can quickly respond to changes in the link state. response, but is easily affected by uncertain factors, therefore, it will also lead to poor reliability of link quality assessment results

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