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Time synchronization method of wireless sensor network

A wireless sensor and time synchronization technology, applied in synchronization devices, network topology, wireless communication, etc., can solve problems such as low error correction capability and high transmission error packet rate

Inactive Publication Date: 2020-03-13
TIANJIN UNIV
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Problems solved by technology

[0007] The purpose of the present invention is to: aim at the deficiencies of the prior art, provide a kind of time synchronization method of the wireless sensor network, solve the problem that the synchronization beacon frame transmission error packet rate is higher in the wireless channel, based on the sensor node in the wireless sensor network The characteristics of hardware resources and encoding and decoding methods, and the encoding scheme with low complexity and high error correction ability is adopted to ensure the reliable transmission of synchronization information, which helps to improve the accuracy of time synchronization and prolong the synchronization survival time

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[0070] Certain terms are used, for example, in the description and claims to refer to particular components. Those skilled in the art should understand that hardware manufacturers may use different terms to refer to the same component. The specification and claims do not use the difference in name as a way to distinguish components, but use the difference in function of components as a criterion for distinguishing. As mentioned throughout the specification and claims, "comprising" is an open term, so it should be interpreted as "including but not limited to". "Approximately" means that within an acceptable error range, those skilled in the art can solve technical problems within a certain error range and basically achieve technical effects.

[0071] In the description of the present invention, it should be understood that the orientation or positional relationship indicated by the terms "upper", "lower", "front", "rear", "left", "right", horizontal" etc. are based on the draw...

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Abstract

The invention discloses a time synchronization method of a wireless sensor network. A main node firstly generates a synchronous beacon frame; then, a low-complexity encoding scheme is preset accordingto the hardware configuration condition of the sensor node chip; error correction coding of the synchronous beacon frame is completed; the encoded synchronization information is periodically broadcasted; and after receiving the data packet, the slave node firstly selects a corresponding software or hardware decoding method for rapid decoding according to a preset encoding scheme, then identifiesand verifies a decoded data frame, finally realizes time synchronization with the master node according to a flooding time synchronization protocol, and sends a user data packet. According to the invention, the problem of high packet error rate of transmission of the synchronous beacon frame in the wireless channel is solved; based on hardware resource characteristics and a coding and decoding method of sensor nodes in a wireless sensor network, a coding scheme with low complexity and high error correction capability is realized by adopting coding, reliable transmission of synchronization information is ensured, and improvement of time synchronization precision and prolongation of synchronization survival time are facilitated.

Description

technical field [0001] The invention belongs to the technical field of wireless sensor networks, and in particular relates to a time synchronization method of wireless sensor networks. Background technique [0002] Wireless sensor network is a highly cross-integrated wireless communication technology, sensing technology and computer technology. It is a distributed system composed of a large number of sensor nodes with data acquisition, processing and wireless communication capabilities. It has been widely used in fields such as transportation and health care. As a typical distributed system, the wireless sensor network cannot guarantee the consistency of the startup time of each node, and the crystal oscillator is greatly affected by environmental factors such as temperature and humidity, and frequency offset and clock drift will occur, resulting in Even if the sensor nodes achieve time synchronization at a certain moment, then the node clocks will be biased. Therefore, in...

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Application Information

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IPC IPC(8): H04W56/00H04W84/18H04J3/06H04L1/00
CPCH04J3/0638H04L1/0061H04L1/0071H04W56/001H04W84/18
Inventor 陈为刚黄刚韩昌彩杨晋生
Owner TIANJIN UNIV
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