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
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

While some hardware techniques, such as temperature compensated crystal oscillators, can address

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  • Method for synchronizing time of wireless sensor network
  • Method for synchronizing time of wireless sensor network
  • Method for synchronizing time of wireless sensor network

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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...

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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

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Application Information

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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
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