Estimation of Clock offset from one-way delay measurement on asymmetric paths

Authors:
Masato Tsuru;Tetsuya Takine;Yuji Oie
Affiliations:
-;-;-
Venue:
SAINT-W '02 Proceedings of the 2002 Symposium on Applications and the Internet (SAINT) Workshops
Year:
2002

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Abstract

As the Internet is shifting towards a reliable QoS-aware network, accurately synchronized clocks distributed in the Internet become more significant. Network Time Protocol (NTP) is broadly deployed in the Internet for clock synchronization among distributed hosts, but it is weak in asymmetric paths, i.e., it cannot accurately estimate the clock offset between two hosts when the forward and backward paths between them have different one-way delays.In this paper, we focus on estimating the offset and the skew of a clock from one-way delay measurement between two hosts, and propose an idea for improvement of such estimations, which reduces estimation errors in case that the forward and backward paths have different bandwidths that is one of main factors of the asymmetric delays.