Clock synchronization method for equipment in local area network

Abstract

The invention discloses a clock synchronization method for equipment in a local area network. The method comprises the following steps: based on an IEEE 1588 protocol design idea, concentrating clockinformation of each device in a time management unit through a reciprocating message; calculating according to the time of each device and the time management unit information to obtain a phase deviation and a frequency correction coefficient of the device; associating the phase deviation with the frequency correction coefficient and the equipment number to generate a relative time deviation list,and sending the relative time deviation list to each piece of equipment needing to be synchronized; and enabling the equipment to inquire the relative deviation time list according to the equipment number and the target equipment number to obtain the frequency correction coefficient of the equipment and the relative time deviation of the equipment and the target equipment, so that clock phase synchronization and frequency correction can be realized. According to the clock frequency synchronization method based on the list, the problems that in the IEEE 1588 protocol synchronization process, the load is large, and the clock synchronization execution period is possibly long are solved, and in the time synchronization process, the clock frequency synchronization method based on the list is provided.

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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