TCP-Africa: An adaptive and fair rapid increase rule for scalable TCP

Ryan King, Richard Baraniuk, Rudolf Riedi

Research output: Chapter in Book/Report/Conference proceedingConference contribution

82 Scopus citations


High capacity data transfers over the Internet routinely fail to meet end-to-end performance expectations. The default transport control protocol for best effort data traffic is currently TCP, which does not scale well to 100Mbps and higher networks over long distances. In congestion avoidance TCP is not swift enough to fully utilize resources over paths with a high delay bandwidth product. First attempts to alleviate this problem by equipping TCP with increased aggressiveness have shown the disadvantage of poor fairness with the ubiquitous standard TCP-Reno, or in some cases, even among two connections running over the same path. We propose a new delay sensitive-congestion avoidance mode (TCP-Africa) that allows for scalable, aggressive behavior in large underutilized links, yet falls back to the more conservative TCP-Reno algorithm once links become well utilized and congestion is imminent. Through ns2 simulations we argue for the safety, efficiency, and fairness of TCP-Africa.

Original languageEnglish (US)
Title of host publicationProceedings - IEEE INFOCOM 2005. The Conference on Computer Communications - 24th Annual Joint Conference of the IEEE Computer and Communications Societies
EditorsK. Makki, E. Knightly
Number of pages11
StatePublished - 2005
EventIEEE INFOCOM 2005 - Miami, FL, United States
Duration: Mar 13 2005Mar 17 2005

Publication series

NameProceedings - IEEE INFOCOM
ISSN (Print)0743-166X


Country/TerritoryUnited States
CityMiami, FL


  • High-bandwidth-delay products
  • Scalable TCP
  • TCP fairness

ASJC Scopus subject areas

  • Electrical and Electronic Engineering
  • Hardware and Architecture


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