A wireless sensor network time synchronization method and system
A wireless sensor and time synchronization technology, applied in wireless communication, synchronization devices, network topology, etc., can solve the problems of low time synchronization accuracy and poor adaptability to multi-hop networks, and achieve small mutual influence, improved robustness, and low energy consumption Effect
Active Publication Date: 2019-07-16
CHANGCHUN UNIV OF SCI & TECH
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[0005] The purpose of the present invention is to provide a wireless sensor network time synchronization method and system to overcome the problems of low time synchronization accuracy and poor adaptability to multi-hop networks in existing synchronization methods
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[0064] The following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only some, not all, embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without making creative efforts belong to the protection scope of the present invention.
[0065] The purpose of the present invention is to provide a wireless sensor network time synchronization method and system to overcome the problems of low time synchronization accuracy and poor adaptability to multi-hop networks in the existing synchronization methods.
[0066] In order to make the above objects, features and advantages of the present invention more comprehensible, the present invention will be further described in detail below in conjunction w...
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The invention discloses a wireless sensor network time synchronization method and system. The method includes: constructing a multi-layer wireless sensor network model; obtaining time synchronization information of two-way communication between an auxiliary node and a parent node; according to the time synchronization information, using the maximum likelihood Then the estimation function estimates the relative time offset between the auxiliary node and the parent node and the relative time offset between the child node and the auxiliary node, and completes the time synchronization between the auxiliary node and the child node relative to the parent node. The main node of the present invention corresponds to two auxiliary nodes, and the robustness of the algorithm can be effectively improved through additional auxiliary nodes. The child nodes in the network use the synchronization information of the parent node and the auxiliary node to perform time synchronization, and the mutual influence is small. The problem of poor adaptability of multi-hop networks is solved; the maximum likelihood estimation function is used to synchronize the time of auxiliary nodes and sub-nodes, which improves the time accuracy.
Description
technical field [0001] The invention relates to the field of wireless communication, in particular to a method and system for time synchronization of a wireless sensor network. Background technique [0002] A wireless sensor network is a self-organizing network system formed by a large number of cooperating miniature multifunctional sensors (miniature sensor nodes) through wireless communication. At present, wireless sensor networks are widely used and can be used in environmental monitoring, medical research and other fields. The wide range of applications makes it difficult to have a fixed and clear standard for wireless sensor networks, and most of them are adjusted in a timely manner according to the current environment, usage, and scale. This also poses technical challenges to sensor processing terminals and wireless nodes. It must not only adapt to various environments, but also ensure the accuracy and reliability of its own hardware. [0003] Each node of the wirele...
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IPC IPC(8): H04W56/00H04W84/18
CPCH04W56/00H04W84/18
Inventor 陈桂芬张天禹王义君
Owner CHANGCHUN UNIV OF SCI & TECH