A wireless sensor network time synchronization method and device

Abstract

The invention relates to a wireless sensor network time synchronization method and device. The method includes: step (1) acquiring a root node and its corresponding child nodes in a tree topology structure of a sensor network; step (2) acquiring the The transmission delay between the root node and its corresponding sub-nodes, and the time synchronization is performed between the root node and its corresponding sub-nodes according to the transmission delay, step (3) The sensor network tree topology The root node in the structure and the sub-nodes in the corresponding sub-nodes are used as the root node and return to the step (1), until all nodes in the sensor network tree topology structure complete the time synchronization, the technical solution provided by the present invention , to solve the problem of time synchronization between multiple nodes in the wireless sensor network. This design method fully considers the influence of sending time, access time, transmission time, receiving time, and receiving time on the synchronization accuracy, which can reduce the wireless sensor network. The time synchronization error of each node in the

Description

technical field [0001] The invention relates to the field of wireless communication, in particular to a time synchronization method and device for a wireless sensor network. Background technique [0002] Time synchronization between nodes in wireless sensor networks is an important prerequisite for ensuring other communication protocols in wireless sensor networks. [0003] At present, many common communication protocols have defects in the application of wireless sensor networks. Among them, the NTP (Net Time Protocol) protocol is the time synchronization protocol standard currently used on the Internet. Although the accuracy is high, the premise of this protocol is the link in the network The failure is very small, the entire network adopts a stable topology structure, and the power consumption is large, and the wired transmission is adopted, which is obviously not suitable for the wireless sensor network with limited power consumption and cost / unstable structure. The GPS...

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Problems solved by technology

[0003] At present, there are defects in many general communication protocols applied to wireless sensor networks. Among them, the NTP (Net Time Protocol) protocol is the time synchronization protocol standard currently used on the Internet. Although the accuracy is high, the premise of this protocol is that the links in the network The failure is very small, the entire network adopts a stable topology, consumes a lot of power, and uses wired transmission, which is obviously not suitable for wireless sensor networks with limited power consumption and cost / unstable structure

The GPS system can also provide high-precision time synchronization, but its signal penetration is poor, the GPS antenna must be installed in an open place, the power consumption is large, and the cost is high, so it is not suitable for wireless sensor networks

Although the TPSN (Timing-Sync Protocol for Sensor Networks) algorithm uses a sender-receiver two-way pairwise synchronization algorithm, it does not fully consider the impact of media access delay on synchronization accuracy

The RBS (Reference Brocast Synchronization) synchronization mechanism uses a receiver-receiver synchronization algorithm, which cannot achieve time synchronization between the sender and the receiver

The DMTS (Delay Measurement Time Synchronization) algorithm is a one-way time synchronization algorithm based on the sender-receiver, but it cannot realize the time synchronization between the sender and the receiver, and the algorithm does not consider the influence of propagation delay on synchronization accuracy

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