Calibrating NTP - Université Grenoble Alpes Accéder directement au contenu
Communication Dans Un Congrès Année : 2019

Calibrating NTP

Faten Mkacher
  • Fonction : Auteur
  • PersonId : 1055402
Andrzej Duda


In this paper, we propose a method of improving the accuracy of NTP time synchronization by taking into account asymmetric transmission delays due to different bandwidth or routing on the forward and backward paths. The method consists of calibrating NTP synchronization by: i) deploying a time box with a GPS clock at a given client, ii) measuring the one-way transmission delay on the forward and backward path and finding the minimal delays, iii) using the minimal delays in the estimation of the clock offset at the client to take into account path asymmetry, and iv) recalibrating if routes change. The paper first reports on the measurements of one-way transmission delays between a client and a server interconnected by several routers. We then use the parameters of the delay distributions to estimate the clock offset at the client. To validate the proposed method, we have compared the clock offsets computed by standard NTP and calibrated NTP based on the GPS time reference. The measurements show significant improvement of the NTP time synchronization accuracy and precision.
Fichier principal
Vignette du fichier
Calibrating NTP.pdf (527.58 Ko) Télécharger le fichier
Origine : Fichiers produits par l'(les) auteur(s)

Dates et versions

hal-02305093 , version 1 (03-10-2019)


  • HAL Id : hal-02305093 , version 1


Faten Mkacher, Andrzej Duda. Calibrating NTP. 2019 International IEEE Symposium on Precision Clock Synchronization for Measurement, Control, and Communication (ISPCS), Sep 2019, Portland, United States. ⟨hal-02305093⟩
216 Consultations
730 Téléchargements


Gmail Facebook X LinkedIn More