Journal of the Institute of Electronics Engineers of Korea TC (대한전자공학회논문지TC)

The Institute of Electronics and Information Engineers (대한전자공학회)
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A Mechanism to improve the TCP performance in 802.11 Wireless Networks

802.11 무선 네트워크에서 TCP 성능 향상을 위한 기법

  • Zhang, Fu-Quan (Dept. of Electronics and Communications, Hanyang University) ;
  • Kim, Jun-Hwan (Dept. of Electronics and Communications, Hanyang University) ;
  • Park, Yong-Jin (Dept. of Electronics and Communications, Hanyang University)
  • 장복전 (한양대학교 전자컴퓨터통신공학부) ;
  • 김준환 (한양대학교 전자컴퓨터통신공학부) ;
  • 박용진 (한양대학교 전자컴퓨터통신공학부)
  • Published : 2009.02.25
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Abstract

Improving TCP performance has long been the focus of many research efforts in 802.11 wireless networks study. Hop count and Round Trip Time (RTT) are the critical sources which serious affect the TCP performance on end to end connection. In this paper, we analytical derived the affection and based on the analysis we propose TCP should Change its Expected Value (TCP-CEV) when hop count and RTT change by setting a reasonable CWND change rate to improve the performance. The proposed scheme is applicable to a wide range of transport protocols using the basic TCP mechanism, and the protocol behavior is analytically tractable. We show that our simple strategy improves TCP performance at least over 12% in a chain topology, 4.9% in a grid topology and improve the TCP convergence.

최근 802.11 무선 네트워크에서 TCP성능 향상을 위한 많은 연구가 이루어지고 있다. End-to-end 연결에서 TCP성능을 결정하는 가장 큰 요인으로는 hop-count와 RTT (Round Trip Time) 이다. 본 논문에서는 TCP의 성능을 향상하기 위해, hop-count와 RTT 변경 시 적절한 CWND값을 설정하여 TCP-CEV을 변경하는 기법을 설명한다. 본 논문에서 제안한 기법은 기본 TCP 구조를 따르는 대부분의 transport 프로토콜에 적합하고, 분석적인 과정을 통해 결과를 도출한다. 시뮬레이션을 통해 제안한 기법이 체인 토폴로지에서 12%, 격자 토폴로지에서 4.9% 이상 성능이 향상되었으며, TCP window가 특정 값에 수렴하는 것을 보인다.

Keywords

References

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