Time synchronization method applicable to wireless sensor network

Abstract

The invention requests to protect a time synchronization method applicable to a wireless sensor network and relates to a wireless network communication technology. The time synchronization method comprises the steps: time source equipment generates beacon frames and broadcasts and sends the beacon frames periodically; non-time source equipment obtains time stamps in the transmitting and receiving process of the beacon frames, obtains frequency deviation and time deviation of an equipment clock and a time source equipment clock according to calculation of a plurality of collected time stamps, compensates a local clock and realizes synchronization with a time source; and time synchronization is carried out step by step, and finally the time synchronization of the whole network is realized. Considering the application environment of the equipment and different requirements for time synchronization, a multi-stage and multilevel synchronization mechanism for combining broadcast synchronization, matching synchronization and monitoring synchronization is adopted. The non-time source equipment can apply synchronization of time synchronization command frames according to different requirements, the equipment without applying the time synchronization command frames can monitor and receive the time synchronization command frames similarly and finish synchronization, so that the whole communication overhead and energy consumption of the network are reduced and the normal operation of the network is guaranteed.

Description

technical field [0001] The invention belongs to the technical field of wireless network communication, in particular to a time synchronization method in a wireless sensor network. Background technique [0002] Due to its huge application prospects, wireless sensor networks have received more and more attention from academia and industry. Wireless sensor networks can collaboratively detect and collect information on various monitoring objects in the network deployment area in real time, and provide information on such It has broad application prospects in military, environmental monitoring, medical and health, industrial automation, public safety and other aspects. Time synchronization is an important part of wireless sensor networks. In many applications, nodes in the network need to cooperate with each other to complete the work. Therefore, it is very important to make each node work under a unified time scale. A good time synchronization mechanism can ensure that the senso...

AI Technical Summary

Problems solved by technology

[0005] The invention provides a time synchronization method for a wireless sensor network. The method aims at the problem that the quality of wireless communication in the wireless sensor network is susceptible to interference and node equipment fails, and proposes a multi-redundant time source mechanism to ensure that when the time source node fails The network can still communicate normally; at the same time, a multi-level time synchronization mechanism is proposed, which can provide node devices with different precision time synchronization services in a wireless sensor network to meet the needs of different sensor node applications, and based on this time The synchronization mechanism proposes a method of "over-monitoring", which can reduce the communication overhead and energy consumption of time synchronization while maintaining the accuracy of time synchronization

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