Network time protocol precision timestamping service

Details Network time protocol precision timestamping service Network time protocol precision timestamping service

H - Electricity

04

L

H04L 12/28 (2006.01) H04J 3/06 (2006.01)

Patent

CA 2652594

Embodiments of the present invention set forth a method and system for reducing uncertainty in receive and transmit timestamps created by an NTP server. The uncertainty in the receive timestamps is removed by recording the time-of-arrival in the hardware clock of the NTP server before the incoming packets may be delayed by traversing the various layers of software in a timestamping system. The uncertainty in the transmit timestamps is removed by giving the outgoing packets a timestamp in the future using an estimate of the transmission latency calculated by the latency estimator filter. Subsequently, the actual time-of-departure is used to re-calculate and update the estimate of the transmission latency. In this fashion, superior control of the timestamping function may be implemented in existing NTP servers in a manner that retains interworking compatibility with the current NTP standards.

L'invention porte sur un procédé et un système de réduction de l'incertitude sur les horodatages reçus et émis créés par un serveur NTP. On réduit l'incertitude en enregistrant l'heure d'arrivée dans l'horloge physique du serveur NTP, avant que les paquets entrants ne soient retardés en traversant les différentes couches de logiciels du système horodateur. Cette réduction s'effectue en donnant aux paquets sortants un horodatage futur en leur appliquant une estimation du retard de transmission calculée par un filtre ad hoc. On utilise ensuite le temps actuel de départ pour recalculer et mettre à jour l'estimation du retard de transmission. On peut ainsi conférer à des serveurs NTP existants une excellente maîtrise de la fonction d'horodatage tout en conservant la compatibilité de fonction avec les normes NTP existantes.

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