On Modeling Round-Trip Time Dynamics of the Internet Using System Identification

  • Authors:
  • Hiroyuki Ohsaki;Mitsushige Morita;Masayuki Murata

  • Affiliations:
  • -;-;-

  • Venue:
  • ICOIN '02 Revised Papers from the International Conference on Information Networking, Wireless Communications Technologies and Network Applications-Part I
  • Year:
  • 2002

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Abstract

Understanding the end-to-end packet delay dynamic of the Internet is of crucialimportance since it directly affects the QoS (Quality of Servics) of realtime services, and it enables us to design an efficient congestion control mechanism. In this paper, we measure the round-trip time, and build a mathematical model representing its dynamics using system identification. We first measure as the input and output data for system identification, the packet inter-departure time from a source host and the corresponding round-trip time measured by the source host. ICMP (Internet Control Message Protocol) is utilized to measure the round-trip time for each packet. We next model the network,seen by a specific source host, a dynamic SISO (Single.Input and Single-Output) system. Using measurement results obtained from three different network configurations, we investigate how accurately the round-trip time dynamics of the Internet can be modeled with the sytem identification.