Leading causes of TCP performance degradation over wireless links

  • Authors:
  • Chunlei Liu

  • Affiliations:
  • Department of Mathematics and Computer Science, Valdosta State University, Valdosta, GA

  • Venue:
  • ICESS'05 Proceedings of the Second international conference on Embedded Software and Systems
  • Year:
  • 2005

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Abstract

TCP is known to have performance degradation over wireless links but causes of the performance degradation have not been well studied. In order to understand the causes and to gain insight for future enhancements, we design a series of simulations to collect performance data and use stepwise multiple regression to find the leading causes. Our analysis indicates that timeout is the dominant cause of wireless TCP performance degradation. Simulations show current enhancements fail to improve the timeout behavior and thus have limited improvement. Based on these findings, we propose a new enhancement that uses ECN to deliver congestion signals and utilizes the coherence among congestion signals to distinguish wireless losses from congestion losses. Simulation results demonstrate that this enhancement thoroughly changes TCP’s timeout behavior and improves the overall performance to a new level.