A clock synchronization method for devices in a local area network

Abstract

A clock synchronization method for devices in a local area network. Based on the design idea of ​​IEEE 1588 protocol, it collects the clock information of each device in the time management unit through the round-trip message; calculates the phase deviation and the frequency correction coefficient of the device according to the time of each device and the information of the time management unit; The frequency correction coefficient is associated with the device number to generate a relative time deviation list, which is sent to each device that needs to be synchronized; the device queries the relative deviation time list according to its own device number and the destination device number to obtain the frequency correction coefficient of the device and the time difference between the device and the destination device. The relative time deviation can realize the synchronization of the clock phase and the correction of the frequency. The invention not only optimizes the problem of heavy load caused by the IEEE 1588 protocol synchronization process and the possible long clock synchronization execution period, but also proposes a list-based clock frequency synchronization method during the time synchronization process.

Description

technical field [0001] The invention belongs to the technical field of local area network communication, and in particular relates to a clock synchronization method of devices in a local area network. Background technique [0002] In modern communication networks, the calculation requirements for clock bias are becoming more and more common, and the accuracy requirements are getting higher and higher. Common application scenarios, such as: collaborative work of devices in a distributed network, precise control of high-precision control systems, and determination of high-speed real-time data transmission delays, etc., all require calculation of time deviations to achieve clock synchronization. [0003] Clock synchronization is divided into phase synchronization and frequency synchronization. At present, domestic research on clock synchronization mostly focuses on phase synchronization, such as NTP protocol research, IEEE1588 protocol research, AS6802 protocol research, and s...

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Problems solved by technology

[0006] For phase synchronization, the commonly used IEEE 1588 clock synchronization protocol uses round-trip packets to achieve clock time synchronization, and the accuracy can reach the microsecond level, but its disadvantage is that it causes a large network load, so there is a certain room for optimization

In addition, the IEEE 1588 clock synchronization protocol adopts a hierarchical synchronization architecture. When the network scale is large, the execution cycle of its clock synchronization will be longer

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