Oscillations and buffer overflows in video streaming under non-negligible queuing delay

  • Authors:
  • Yueping Zhang;Dmitri Loguinov

  • Affiliations:
  • Texas A&M University, College Station, TX;Texas A&M University, College Station, TX

  • Venue:
  • NOSSDAV '04 Proceedings of the 14th international workshop on Network and operating systems support for digital audio and video
  • Year:
  • 2004

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Abstract

In this paper, we analyze how feedback delays affect stability, oscillations, and packet loss of several classes of congestion controllers used or proposed for video streaming in the current/future Internet (including window-based AIMD, rate-based AIMD, Scalable TCP, and TFRC). Our results indicate that window-based protocols in this list incur significantly less packet loss under delayed feedback than their rate-based counterparts, which explains their better overall performance observed in practice [12]. At the same time, we show that even TCP's congestion control is far from ideal from the control-theoretic point of view and leads to amplified oscillations when queuing delays increase. We conclude with an observation that multimedia in the future Internet is not likely to enjoy oscillation-free congestion control unless the network deploys some form of AQM.