Method for achieving accuracy of transparent clock path delay of IEEE1588 protocol

Abstract

The invention discloses a method for achieving accuracy of transparent clock path delay of an IEEE1588 protocol. The method includes the steps that four time stamps are acquired in the mode that a time synchronization mechanism of the IEEE1588 protocol is operated and a P2P transparent clock mechanism is adopted, a path delay value is acquired through calculation via a clock synchronization algorithm, a threshold value setting method is utilized, the path delay value is compared with a threshold value, if the path delay value is smaller than the stipulated threshold value, the path delay value is preserved and next-time clock synchronization is executed, if the deviation value between the path delay value and a new path delay value is larger than the preset threshold value, PID feedback regulation is conducted, the path delay value is compared with the threshold value again, if the path delay value is still larger than the threshold value, the path delay value is considered to be wrong and is abandoned, and if the path delay value is smaller than the stipulated threshold, the path delay value is preserved and next-group synchronization is executed. The method can solve the problem that the path deviation value is instable in the existing IEEE1588v2 time synchronization process, so that synchronization accuracy is affected.

Description

technical field [0001] The invention relates to the technical field of communication, in particular to a method for precise IEEE1588 protocol transparent clock path delay. Background technique [0002] The full name of IEEE1588 is "Precision Clock Synchronization Protocol Standard for Network Measurement and Control Systems". The IEEE1588v2 protocol is a time synchronization standard promulgated by the IEEE Association in 2008 (the version promulgated in 2002 is usually referred to as the first version). Although the current IEEE1588v2 protocol provides several clock synchronization modes, and theoretically can achieve sub-microsecond synchronization accuracy. Most domestic researchers engaged in IEEE1588 research are in the theoretical research stage, but there are not many devices that are actually put into use to achieve high-precision clock synchronization, and most of them are based on the synchronization of the first version. When packets pass through the various lay...

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Problems solved by technology

[0003] What the present invention is to solve is the problem that the unstable path deviation value affects the synchronization accuracy in the t

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