Wireless sensor network consistency time synchronization method for reducing network traffic

A wireless sensor and time synchronization technology, applied in the field of wireless networks, can solve the problems of lack of algorithm optimization, large energy overhead, etc., and achieve the effect of reducing the number of packets sent

Active Publication Date: 2018-04-20
CHONGQING UNIV OF POSTS & TELECOMM
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Problems solved by technology

At the same time, there is currently a lack of optimization of the algorithm, and the periodic communication between nodes causes a lot of energy overhead

Method used

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  • Wireless sensor network consistency time synchronization method for reducing network traffic
  • Wireless sensor network consistency time synchronization method for reducing network traffic
  • Wireless sensor network consistency time synchronization method for reducing network traffic

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Embodiment Construction

[0042] The preferred embodiments of the present invention will be described in detail below with reference to the accompanying drawings.

[0043] The invention aims at the cluster network topology structure in the wireless sensor network, adopts the time synchronization method based on the maximum consistency theory to realize clock synchronization between nodes, so that the logic clocks of all nodes can reach a common global clock. refer to image 3 As shown, the time synchronization process of the method of the present invention starts from the cluster head and divides the time synchronization process into three steps, which are respectively the first step: the first time synchronization in the cluster, the second step: the inter-cluster time synchronization, and the third step Step: Time synchronization again within the cluster. In the first step: the first time synchronization in the cluster, using the maximum consistency time synchronization method, the logical clock of ...

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Abstract

The invention relates to a wireless sensor network consistency time synchronization method for reducing network traffic, belonging to the field of wireless networks. The method aims at a clustering wireless sensor network and divides a synchronization process into three steps, i.e., first time synchronization within clusters, time synchronization between the clusters, and time resynchronization within the clusters. The first synchronization within the clusters and the resynchronization within the clusters use a maximum consistency time synchronization method and only need four-time and two-time communications respectively; in the synchronization between the clusters, all cluster heads are synchronized by adopting a maximum consistency method, and the exchange of cluster head messages is implemented by means of the message forwarding of gateway nodes. Therefore, in the process of synchronization between the clusters, common nodes in the clusters do not need communication; compared withthe existing method which requires nodes in the clusters to broadcast or reply to messages in each period, the wireless sensor network consistency time synchronization method can effectively reduce the communication traffic between the nodes and accelerate the convergence speed in a synchronization process, thus prolonging the network lifetime of the nodes.

Description

technical field [0001] The invention belongs to the field of wireless networks, and relates to a wireless sensor network consistent time synchronization method for reducing network traffic. Background technique [0002] Wireless Sensor Networks (WSNs) are increasingly used in automation because of their advantages of easy installation, flexible deployment and high cost efficiency. Time synchronization is a basic support technology of wireless sensor network. It provides the necessary basic conditions for many applications of wireless sensor networks, such as target tracking, node positioning, event monitoring, transmission scheduling, etc. In the past few decades, based on different application scenarios, numerous time synchronization protocols and algorithms have been proposed. These algorithms can be divided into two categories: centralized time synchronization algorithms and distributed time synchronization algorithms. [0003] Most centralized time synchronization prot...

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Application Information

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IPC IPC(8): H04W52/02H04W56/00
CPCH04W52/0209H04W56/001Y02D30/70
Inventor 王平熊代金王恒
Owner CHONGQING UNIV OF POSTS & TELECOMM
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