End-to-end available bandwidth estimation and time measurement adjustment for multimedia QOS

  • Authors:

  • Qiang Liu;Jeng-Neng Hwang

  • Affiliations:

  • Dept. of Electr. Eng., Washington Univ., Seattle, WA, USA;Dept. of Electr. Eng., Washington Univ., Seattle, WA, USA

  • Venue:
  • ICME '03 Proceedings of the 2003 International Conference on Multimedia and Expo - Volume 3 (ICME '03) - Volume 03
  • Year:
  • 2003

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Abstract

Congestion control is an important function in a multimedia application. Since multimedia packets are mostly transmitted in UDP, which lacks the congestion control mechanism in TCP, a separate congestion control is necessary to avoid excessive packet losses and to be fair with competing TCP flows. As UDP congestion control is rate-based, unlike the window-based one used in TCP, end-to-end available bandwidth estimation can play a critical role in UDP congestion control. This paper proposes a new method to estimate the available bandwidth based on the delay trend detection, which is suitable for a multimedia application. We deduct the relationship between delay trend and available also show the Internet experiment results. Various practical time measurement errors are analyzed and their countermeasures are proposed.