Clock synchronization method and device

Abstract

The invention discloses a clock synchronization device and a clock synchronization method. The device comprises a delay measurement module, a clock extraction module and a delay compensation module, wherein the delay measurement module is used for measuring a delay value of a message passing through a hardware delay node in real time, and transmitting the delay value to the delay compensation module; the clock extraction module is used for extracting a timestamp stamped before a precision time protocol message enters the hardware delay node when the message is determined to be the precision time protocol message, and transmitting the timestamp to the delay compensation module; and the delay compensation module is used for correspondingly performing delay compensation according to the received delay value and the received timestamp. Compared with the delay value, computed as a fixed value, of the precision time protocol (PTP) message passing through a certain hardware delay node, the delay value, measured in real time, of the PTP message passing through the certain hardware delay node is more precise. Therefore, corresponding timestamp regulation can be performed according to the precise delay value and the extracted timestamp, and the synchronization accuracy of the precision time protocol message is further improved.

Description

technical field [0001] The present invention relates to the field of communication technology, in particular, to a method for realizing clock synchronization based on the Precision Time Protocol (Precision Time Protocol) of IEEE1588 (precise clock synchronization protocol standard for network measurement and control systems) and device. Background technique [0002] The precision clock protocol is a distributed Ethernet precise synchronization clock protocol defined by the IEEE1588 standard. It can use the widely used and low-cost Ethernet to realize the synchronization between various systems and greatly reduce the cost of system clock synchronization. Its synchronization accuracy can reach microsecond level. [0003] The Accurate Clock Protocol borrows from the NTP technology and has the characteristics of easy configuration, fast convergence, and low consumption of network bandwidth and resources. Its main synchronization principle is to periodically correct the clocks ...

AI Technical Summary

Problems solved by technology

But in fact, the transmission delay of the hardware layer is not completely fixed. This is because the hardware may be upgraded or changed, which will cause the hardware delay after the change to be different from the delay before the change; Second-level delay fluctuations, so the hardware delay is not completely fixed

Since the fluctuation of hardware layer transmission delay is ignored in the existing technology, it will have a certain impact on the final synchronization accuracy

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