Improved method for time synchronization based on IEEE 1588 PTP mechanism for wireless network

Abstract

The invention relates to an improved method for time synchronization based on an IEEE 1588 PTP mechanism for a wireless network. The method is characterized by monitoring and intercepting a time information packet of the other adjacent nodes and a main node while exchanging according to the IEEE 1588 PTP mechanism during a time synchronization packet exchanging process under the condition of complying with an IEEE 1588 PTP time information packet exchange mechanism, thereby realizing a slave-slave synchronizing mechanism. The solution is used for expanding the IEEE 1588 PTP master-slave synchronization and can acquire much more time information; under the condition of utilizing the information redundancy acquired from the slave-slave synchronizing mechanism, a linear regression method is adopted for a slave node, so that the estimation for clock offset and frequency shift is more accurate and reliable; the influences caused by dissymmetry of main-secondary paths and insufficient accuracy of timestamp are weakened; the high-precision and high-reliability time synchronization is realized in the wireless network.

Description

technical field [0001] The invention relates to the communication field, in particular to an improved method for time synchronization based on the IEEE 1588PTP mechanism for wireless networks. Background technique [0002] Wireless Sensor Networks (WSNs, Wireless Sensor Networks) is a wireless network composed of a large number of cooperating low-power nodes, each node has limited computing power, wireless communication capabilities and perception capabilities. By introducing control actuators, Wireless Sensor Actuator Networks (WSANs, Wireless Sensor Actuator Networks) refers to a special wireless sensor network that has wireless control execution functions and is suitable for process monitoring and control. Since the local clock of the wireless sensor actuator network node is realized by the interrupt counting of the internal crystal oscillator, the clocks of the nodes in the network are not synchronized due to the difference in the initial timing of the nodes and the freq...

AI Technical Summary

Problems solved by technology

This is manifested in that, limited by battery power supply, hardware equipment and environmental influences (such as temperature), the crystal oscillator accuracy of wireless nodes is limited, and the drift is obvious

Due to the large fading of the wireless channel, it is more susceptible to electromagnetic interference from the external environment than the wired channel, and problems such as hidden nodes, etc., it is easy to cause asymmetrical transmission delay between the master and the slave.

Therefore the standard IEEE 1588PTP is not well suited for wireless sensor actuator networks

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