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Correction method and device for realizing time synchronization

A time synchronization and first-time technology, applied in the network field, can solve the problems of low precision of time synchronization and asymmetric clock transmission delay

Inactive Publication Date: 2019-12-13
BEIJING UNIV OF POSTS & TELECOMM
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Problems solved by technology

[0004] However, the establishment of the IEEE1588 protocol is mainly based on two ideal assumptions: the symmetry of the transmission link and the stability of the master and slave clock frequencies.
However, in the actual communication link, there is an asymmetrical problem in the transmission delay of the master and slave clocks. Therefore, the accuracy of the time synchronization between the base stations of the IEEE1588 protocol in the prior art is low

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  • Correction method and device for realizing time synchronization
  • Correction method and device for realizing time synchronization
  • Correction method and device for realizing time synchronization

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Embodiment Construction

[0041] The following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only some, not all, embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without creative efforts fall within the protection scope of the present invention.

[0042] In order to understand the embodiments of the present invention more thoroughly, the working principle of the IEEE1588 protocol is now described and analyzed in detail, specifically:

[0043] The IEEE1588 protocol defines two delay measurement mechanisms: a delay request measurement mechanism and a terminal delay measurement mechanism. In addition, the premise of these two mechanisms is that the communication link is symmetrical. The scheme for sending pre-m...

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Abstract

The embodiment of the invention discloses a correction method and device for realizing time synchronization. The method comprises the following steps: receiving a forecast which is sent by a main clock and does not carry data; and obtaining a first timestamp stored in the forecast and network delay from the master clock TCP / IP protocol stack to the slave clock TCP / IP protocol stack from the forecast, and correcting the time of the slave clock TCP / IP protocol stack by using the first timestamp, the second timestamp and the network delay. According to the embodiment of the invention, the problemthat the transmission delay between the base stations is asymmetric is considered, and the network delay from the master clock TCP / IP protocol stack to the slave clock TCP / IP protocol stack is recorded by utilizing the forecast, so that the time synchronization precision between the base stations can be improved by applying the method provided by the embodiment of the invention.

Description

technical field [0001] The invention relates to the field of network technology, in particular to a correction method and device for realizing time synchronization. Background technique [0002] With the continuous development of the industrial control field, the aerospace field, and the fifth-generation mobile communication technology in today's society, the requirements for the accuracy of time synchronization between base stations are getting higher and higher. The IEEE1588 protocol is widely used because it can realize time synchronization at sub-microsecond or even nanosecond level. [0003] IEEE15888 protocol, referred to as PTP protocol (Precision Time Protocol), the Chinese full name is "network measurement and control system precision time synchronization protocol standard" protocol, the first version was drafted by the Network Precision Clock Synchronization Committee in 2002, and the second version was released in 2008 The IEEE1588 protocol is IEEE1588v2. The IE...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04J3/06H04W56/00
CPCH04J3/0667H04W56/0015
Inventor 余建国单飞龙王志方董均国常鑫俞正
Owner BEIJING UNIV OF POSTS & TELECOMM
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