Method for realizing accurate time synchronization by utilizing IEEE1588 protocol

A technology for precise time synchronization and protocol implementation, which is applied in the field of network communication and can solve problems such as undefined error correction

Inactive Publication Date: 2010-09-15
ZHEJIANG UNIV
View PDF2 Cites 74 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the IEEE 1588 protocol does not define how to implement error correction

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Method for realizing accurate time synchronization by utilizing IEEE1588 protocol
  • Method for realizing accurate time synchronization by utilizing IEEE1588 protocol
  • Method for realizing accurate time synchronization by utilizing IEEE1588 protocol

Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0039] In the method of the present invention, the principle of performing Offset correction from the clock is as follows figure 2 as shown,

[0040] a) SyncInterval is the synchronization interval, that is, the time interval between sending two adjacent Sync messages. Tamort is the adjustment time length (the time required for each time deviation compensation), and its length changes according to the value of Os;

[0041] b) OM line is the time curve of the master clock, assuming that the master clock has no frequency offset, the slope of this line is 1. Before this synchronization interval (that is, before receiving the Sync message), the time curve of the slave clock is the A-B line. Due to the frequency drift of the slave clock, if the slave offset adjustment is not performed, the slave clock advances along the B-S line. If adjusted directly, the marching curve is B-Os-S. The progress curve of gradual adjustment is B-C-S;

[0042] c) by figure 2 It can be seen that...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to view more

PUM

No PUM Login to view more

Abstract

The invention discloses a method for realizing accurate time synchronization by utilizing an IEEE1588 protocol, comprising the following steps: a) a Sync message is transmitted to a slave clock by a master clock, a transmission timestamp TM1 and a receiving timestamp TS1 of the message are acquired by the slave clock; b) a Delay_Req message is transmitted to the master clock by the slave clock, and a transmission timestamp TM2 and a receiving timestamp TS2 of the message are acquired by the slave clock; c) transmission delay and time offset are calculated by the slave clock according to the timestamp; and d) the calculated Offset is corrected in a fixed adjustment frequency in the correction time by the slave clock. The invention realizes accurate time synchronization, calculates time offset and self-compensate through the slave time clock in a packet based network, and leads the slave clock to lock the master clock whether in clock frequency or on the clock time in a shorter time, and occupies little hardware resources.

Description

technical field [0001] The invention relates to the technical field of network communication, in particular to a method for precise time synchronization using the IEEE 1588 protocol. Background technique [0002] Typically, a packet network consists of a group of nodes interconnected by one or more network communication links. The associated network communication link may include a packet link such as Ethernet or one or more of various packet links that may be employed in distributed control system applications. In packet network systems, there has recently been a growing awareness of the need to support time-sensitive traffic. Therefore, it is necessary to synchronize the clocks among the nodes of the packet network. [0003] In packet networks that include multiple clocks, time synchronization must be employed in order to reduce the inherent instability in source oscillators and to reduce the effects of time drift in the usage environment. In particular, telecommunicati...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to view more

Application Information

Patent Timeline
no application Login to view more
Patent Type & Authority Applications(China)
IPC IPC(8): H04L7/00H04L12/56H04L29/06
CPCH04J3/0667
Inventor 徐元欣刁世斌陈淑敏王洋麻敏觉梁书成章翠枝于强刘云峰王传刚
Owner ZHEJIANG UNIV
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Try Eureka
PatSnap group products

Browse by: Latest US Patents, China's latest patents, Technical Efficacy Thesaurus, Application Domain, Technology Topic.

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap