A Low Memory Overhead Time Synchronization Method for Distributed Wireless Sensor Networks

Abstract

The invention discloses a distributed wireless sensor network time synchronization method with low memory overhead. The method is based on a distributed average algorithm, the memory size of each node can be controllable, the functions of the nodes in a network are consistent, and no reference node and fixed topological structure can exist; each node periodically sends a synchronous beacon and utilizes data in the received synchronous beacon to carry out clock adjustment; the node simultaneously sends the synchronous beacon and locally-stored history timestamp data, and a receiving node can directly find an available timestamp in the synchronous beacon without searching the locally-stored data; and a sending node timely releases the used data through a memory management strategy, so that a purpose of reducing the memory usage is realized. According to the method, wireless nodes with the small memory and low price can be applied to large-scale dynamic networks and intensive distributed networks.

Description

technical field [0001] The invention relates to a wireless sensor network time synchronization method, in particular to a distributed wireless sensor network synchronization method with low memory overhead. Background technique [0002] The wireless sensor network consists of a large number of sensor nodes, which have data acquisition, communication and processing capabilities. With the continuous maturity of technology, wireless sensor network is more and more used in the fields of Internet of Things, home furnishing, industrial control, and medical and health because of its low cost, convenient networking, and low power consumption. [0003] Time synchronization is one of the hot issues in wireless sensor network research. In network applications such as target tracking, network management, and electrical monitoring, high-precision time synchronization is the basis and guarantee for data processing. Due to the differences in the process of node clock crystal oscillators i...

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Problems solved by technology

[0022] The purpose of the present invention is to provide a distributed wireless sensor network time synchronization method with low memory overhead, which is to overcome the problem of excessive memory usage of each node in the current distributed synchronization algorithm, and ensure the stability of distributed time synchronization At the same time, control the memory usage of each node, so that wireless nodes with limited memory can also be applied in large-scale dynamic networks and dense distributed networks

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