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Time synchronization over the Internet using an adaptive frequency-locked loop.

J Levine1

  • 1Nat. Inst. of Stand. and Technol., Colorado Univ., Boulder, CO.

IEEE Transactions on Ultrasonics, Ferroelectrics, and Frequency Control
|February 2, 2008
PubMed
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This study introduces a novel algorithm for synchronizing computer times over networks. It optimizes accuracy and cost by self-configuring, improving network bandwidth usage for precise time synchronization.

Area of Science:

  • Computer Science
  • Network Engineering
  • Distributed Systems

Background:

  • Accurate time synchronization is crucial for distributed systems and network operations.
  • Existing algorithms for network time synchronization face challenges with cost, bandwidth usage, and adaptability to network conditions.

Purpose of the Study:

  • To describe a self-configuring algorithm for synchronizing computer times over packet-switched networks.
  • To achieve a specified performance level at minimum cost (computer cycles or network bandwidth).
  • To improve upon existing time synchronization methods in terms of accuracy, cost-efficiency, and bandwidth utilization.

Main Methods:

  • The algorithm employs a pure frequency-locked loop (FLL) with unequal spacing between calibration cycles.
  • It self-configures to balance accuracy and cost, adapting to network delay asymmetry.

Related Experiment Videos

  • Performance is limited by local clock oscillator instability or measurement noise, achieving ~8 ms RMS with standard hardware.

    • Main Results:

    • The algorithm achieves a trade-off between cost and accuracy, with cost inversely proportional to accuracy squared.
    • It utilizes network bandwidth more efficiently than previous methods by employing a pure FLL.
    • Demonstrates improved adaptability to network delay fluctuations compared to prior algorithms.

    Conclusions:

    • The developed algorithm offers a cost-effective and adaptable solution for network time synchronization.
    • Its design, using a pure FLL and self-configuration, enhances performance and bandwidth efficiency.
    • The algorithm provides a cleaner separation of network and clock noise, crucial for high-accuracy synchronization.