On the Contribution of TCP to the Self-Similarity of Network Traffic

  • Authors:
  • Biplab Sikdar;Kenneth S. Vastola

  • Affiliations:
  • -;-

  • Venue:
  • IWDC '01 Proceedings of the Thyrrhenian International Workshop on Digital Communications: Evolutionary Trends of the Internet
  • Year:
  • 2001

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Abstract

Recent research has shown the presence of self-similarity in TCP traffic which is unaffected by the application level and human factors. This suggests the presence of protocol level contributions to network traffic self-similarity, at least in certain time scales where the effect of protocol behavior is most prominent. In this paper we show how TCP's retransmission and congestion control mechanism contributes to the self-similarity of aggregate TCP flows. We develop a mathematical formulation which shows that TCP's retransmission and congestion control mechanism results in packet dynamics of a TCP flow being analogous to a number of ON/OFF sources with OFF periods taken from a heavy tailed distribution. Using well known limit theorems, we then show that this contributes to the self-similar nature of TCP traffic. Our model shows a direct correlation of the loss rates to the degree of self-similarity. Measurements on traces collected by us also exhibit this relationship predicted by our model.