A High-Precision Time Synchronization Algorithm Based on Selective Software Switch

Author

Rui-Qing, Wu ; Qing-Shui, Gu ; Tian-Qi, Chen

Author_Institution

Sch. of Electron. Eng., Univ. of Electron. Sci. & Technol. of China, Chengdu, China

Volume

2

fYear

2009

fDate

25-26 July 2009

Firstpage

414

Lastpage

416

Abstract

In this paper, we present a selective time synchronization algorithm (STSA) based-on two selective switches using a hardware timestamp at a low-level layer to reduce time synchronization errors over Ethernet, and give the improved formula to calculate the time offset when considering the frequency offset factor in SNTP. The STSA transmits frame-based time synchronization frame on a truncated constant back-off collision resolution algorithm to reduce the delay jitter. This means the time accessing a shared Ethernet bus is more predictable. Experiment results indicate that the STSA achieves microsecond-level synchronization and a high synchronization success rate.

Keywords

carrier sense multiple access; jitter; local area networks; synchronisation; CSMA-CD; Ethernet bus; back-off collision resolution algorithm; delay jitter; frame-based time synchronization; frequency offset factor; hardware timestamp; high-precision time synchronization algorithm; selective software switch; Clocks; Delay effects; Ethernet networks; Frequency synchronization; Hardware; Jitter; Multiaccess communication; Protocols; Software algorithms; Switches; CSMA/CD; Delay jitter; Hardware timestamp; Selective synchronization;

fLanguage

English

Publisher

ieee

Conference_Titel

Information Technology and Computer Science, 2009. ITCS 2009. International Conference on

Conference_Location

Kiev

Print_ISBN

978-0-7695-3688-0

Type

conf

DOI

10.1109/ITCS.2009.223

Filename

5190267