Looking for breakthrough ideas for innovation challenges? Try Patsnap Eureka!

Method for synchronizing time of wireless sensor network

A wireless sensor, network time technology, applied in the direction of synchronization device, wireless communication, network topology, etc., can solve the problem of unsuitable resource and cost sensor network

Inactive Publication Date: 2010-11-10
INST OF SOFTWARE - CHINESE ACAD OF SCI
View PDF2 Cites 33 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

While some hardware techniques, such as temperature compensated crystal oscillators, can address crystal frequency skew, they are not suitable for resource and cost constrained sensor networks

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Method for synchronizing time of wireless sensor network
  • Method for synchronizing time of wireless sensor network
  • Method for synchronizing time of wireless sensor network

Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0052] The present invention will be described in detail below with reference to the accompanying drawings and examples.

[0053] This embodiment provides an example of wireless sensor network time synchronization using the method of the present invention.

[0054] In this embodiment, the sensor nodes are Mica2 series nodes produced by Crossbow Company. The communication frequency of the Mica2 node is 868 / 916MHz, the data transmission rate is 38.4Kbps, and the outdoor communication distance is about 150m. The nominal frequency of the crystal oscillator configured is 7.37MHz, and the clock frequency is 921KHz after 1 / 8 frequency division. In the embodiment, 20 Mica2 nodes are deployed in the open air to form a 20-hop linear network.

[0055] refer to figure 1 , the specific process of this embodiment is as follows:

[0056] 1) The sink node starts the cycle synchronization process at a fixed time interval, and broadcasts its own time information and cycle synchronization ti...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

PUM

No PUM Login to View More

Abstract

The invention discloses a method for synchronizing the time of a wireless sensor network and belongs to the technical field of the wireless sensor network. The method comprises the following steps that: 1) a central node broadcasts synchronization information to a network at a specific time interval and starts a synchronization process; 2) after receiving the synchronization information, a sensornode synchronizes time with a source node of the synchronization information and broadcasts the synchronization information thereof to the network when a channel is free; and 3) after each synchronization process is completed, the sensor node predicts the working frequency of a crystal oscillator configured per se in the current period by a winters method and corrects the logic time thereof according to the prediction result till the start of the next synchronization process. Compared with the prior art, the method can greatly prolong the time interval of period synchronization and reduce synchronization expense and the occupying of a wireless channel and improve the synchronization precision among nodes.

Description

technical field [0001] The invention relates to a time synchronization method, in particular to a wireless sensor network time synchronization method, belonging to the technical field of wireless sensor networks. Background technique [0002] The wireless sensor network is a multi-hop wireless network system composed of a large number of sensor nodes in a self-organizing manner. Its purpose is to cooperatively perceive, collect, process and transmit the information of the monitored objects in the network coverage area, and send it to the end user. Wireless sensor network integrates sensing technology, embedded technology, wireless communication technology and intelligent information processing technology. It has the characteristics of large scale, low cost and flexible networking. It has been widely used in military, industrial, agricultural and medical fields. [0003] Time synchronization is one of the important supporting technologies of wireless sensor networks, and play...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Application Information

Patent Timeline
no application Login to View More
IPC IPC(8): H04W56/00H04W84/18
Inventor 刘燕蒋文涛朱红松孙利民
Owner INST OF SOFTWARE - CHINESE ACAD OF SCI
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Patsnap Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Patsnap Eureka Blog
Learn More
PatSnap group products

Browse by: Latest US Patents, China's latest patents, Technical Efficacy Thesaurus, Application Domain, Technology Topic, Popular Technical Reports.

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap|About US| Contact US: help@patsnap.com