Time synchronization method and device of wireless sensor network

Abstract

The invention discloses a time synchronization method and device for a wireless sensor network, and the method comprises the steps: obtaining a broadcast DIO message in the wireless sensor network through a node to be accessed, transmitting a unicast DIO detection message to an alternative father node which transmits the broadcast DIO message, and when an ACK frame fed back by the alternative father node is received within a preset time period, analyzing the ACK frame to obtain an ACK frame serial number and a standard timestamp, and when the ACK frame is determined to be an ACK feedback frame of the MAC layer of the unicast DIO detection message according to the ACK frame serial number, performing time synchronization according to the standard timestamp. According to the method, a one-way time synchronization method is embedded into an MAC layer confirmation mechanism of the wireless sensor network, a standard timestamp is packaged in an ACK frame, transmission of the standard timestamp is achieved through the ACK confirmation mechanism of the MAC layer, the time synchronization process is triggered by sending a unicast DIO detection message to an alternative father node, and no extra communication overhead is generated in the whole process.

Description

technical field [0001] The present invention relates to the technical field of wireless communication, and more specifically, to a time synchronization method and device for a wireless sensor network. Background technique [0002] With the in-depth research and development of Wireless Sensor Networks (WSN), wireless sensor networks have been applied to various fields of the Internet of Things and become an important part of the Internet of Things. Time synchronization technology is one of the key technologies to maintain the stable operation of wireless sensor networks. It can unify the time of network nodes in the entire network to the standard time, and plays an important role in data acquisition, protocol implementation, power consumption management and other applications of wireless sensor networks. Basic role. [0003] At present, the time synchronization method of the wireless sensor network mainly adopts a specific time synchronization packet, and realizes the time s...

AI Technical Summary

Problems solved by technology

However, the use of specific time synchronization packets will cause additional communication overhead in wireless sensor networks other than data packets, which is not conducive to high-density wireless sensor network deployment

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