Time synchronization method and system for wireless sensor network

Abstract

The invention discloses a time synchronization method for a wireless sensor network. The method comprises the following steps of: generating a synchronous data packet, and marking a transmission timestamp in the synchronous data packet; transmitting the synchronous data packet to a child node; receiving the synchronous data packet, and marking a receiving timestamp in the synchronous data packet; and compensating for the clock drift of the child node according to the transmission timestamp and the receiving timestamp in the synchronous data packet. By the time synchronization method and the time synchronization system for the wireless sensor network, clock drift compensation between a parent node and the child node is realized only by transmitting the synchronous data packet to the child node to realize regional time synchronization in a region formed by the parent node and the child node, and compared with conventional all-network time synchronization, the regional time synchronization reduces network energy consumption and also can avoid the energy consumption caused by crosstalk interference as much as possible.

Description

【Technical field】 [0001] The invention relates to wireless sensor network technology, in particular to a time synchronization method and system in the wireless sensor network. 【Background technique】 [0002] Time synchronization is the most basic requirement in wireless sensor networks. Most protocols and applications used in wireless sensor networks require time synchronization, such as data fusion, ranging positioning, compressed sensing, low-power MAC protocols, routing protocols, collaboration Both transmission and processing need to achieve time synchronization. Traditional time synchronization methods usually only focus on the improvement of synchronization accuracy, but do not conduct in-depth research on the influence of complex environmental conditions in the network environment on the time synchronization process. In the traditional time synchronization process, the Flooding Time Synchronization Protocol (FTSP for short) is usually used to realize the time synchro...

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Problems solved by technology

[0004] Time synchronization methods such as the flooding time synchronization protocol used in wireless sensor networks often need to establish a tree or hierarchical structure based on the entire network when performing time synchronization, and set a special root node or reference in the network for synchronization. node, which will bring additional power consumption

[0005] It can be seen that the time synchronization method proposed for time synchronization in the wireless sensor network has a very ideal experimental accuracy in the experimental process, but there is a defect that each node consumes a lot of energy when it is applied to the real wireless sensor network , especially when combined with other applications, the energy consumption of each node becomes very large

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