Embedded System Design for Network Time Synchronization

  • So-Young Hwang
  • Dong-Hui Yu
  • Ki-Joune Li
Part of the Lecture Notes in Computer Science book series (LNCS, volume 3207)


Every computer needs a timer mechanism to keep track of current time and also for various accounting purposes such as calculating the time spent by a process in CPU utilization, disk I/O, and so on, so that the corresponding user can be charged properly. In a distributed system, an application may have processes that concurrently run on multiple nodes of the system. For correct results, several such distributed applications require that the clocks of the nodes are synchronized with each other. Nowadays, time synchronization has been a compulsory thing as distributed processing and network operations are generalized. A network time server obtains, keeps accurate and precise time by synchronizing its local clock to a standard reference time source and distributes time information through a standard time synchronization protocol. This paper describes design issues and implementation of an embedded system for network time synchronization especially based on a clock model. Our system uses GPS (Global Positioning System) as a standard reference time source and offers UTC (Coordinated Universal Time) through the NTP (Network Time Protocol). Implementation results and performance evaluation are also presented.


Global Position System Time Synchronization Global Position System Satellite Clock Model Local Clock 
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  1. 1.
    Mills, D.L.: A brief history of NTP time: memoirs of an Internet timekeeper. ACM SIGCOMM Computer Communication Review 33(2), 9–21 (2003)CrossRefGoogle Scholar
  2. 2.
    Ganeriwal, S., Kumar, R., Srivastava, M.B.: Timing-Sync Protocol for Sensor Networks. Proceedings of ACM SenSys pp. 138–149 (2003)Google Scholar
  3. 3.
    Levine, J.: Efficient time transfer using the Internet. In: Proceedings of Frequency Control Symposim and PDA Exhibition, pp. 522–529 (2002)Google Scholar
  4. 4.
    Berns, H.C., Wilkes, R.J.: GPS time synchronization system for K2K. IEEE Transactions on Nuclear Science 47(2) Part 1, 340–343 (2000)CrossRefGoogle Scholar
  5. 5.
    Yu, D.H., Hwang, S.Y., Seong, S.Y., Kim, Y.H.: An analysis of error factos in network time server. In: Proceedings of the GNSS Workshop, pp.159–162 (2000)Google Scholar
  6. 6.
    Lewandowski, W., Azoubib, J., Klepczynski, W.J.: GPS: primary tool for time transfer. Proceedings of the IEEE 87(1), 163–172 (1999)CrossRefGoogle Scholar
  7. 7.
    Jun, S.M., Yu, D.H., Seong, S.Y., Kim, Y.H.: A time synchronization method for NTP. Proceedings of the RTCSA, pp. 466–473 (1999)Google Scholar
  8. 8.
    Minar, N.: A survey of the NTP network, MIT Media Lab. (1999)Google Scholar
  9. 9.
    Sinha, P.K.: Distributed Operating Systems: Concepts and Design, pp. 282–292. IEEE Computer Society, Los Alamitos (1997)zbMATHGoogle Scholar
  10. 10.
    Mills, D.L.: Network Time Protocol (Version 3) Specification, Implementation and Analysis, RFC1305 (1992)Google Scholar
  11. 11.
    Skoog, P.: The Importance of Network Time Synchronization, TrueTime Inc.Google Scholar
  12. 12.
    Time and Frequency from A to Z,

Copyright information

© Springer-Verlag Berlin Heidelberg 2004

Authors and Affiliations

  • So-Young Hwang
    • 1
  • Dong-Hui Yu
    • 2
  • Ki-Joune Li
    • 1
  1. 1.Department of Computer Science and EngineeringPusan National UniversityPusanSouth Korea
  2. 2.School of Computer Information EngineeringCatholic University of PusanPusanSouth Korea

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