Journal of KIISE (정보과학회 논문지)

Korean Institute of Information Scientists and Engineers (한국정보과학회)
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A Network-Aware Congestion Control Scheme for Improving the Performance of C-TCP over HBDP Networks

HBDP 네트워크에서 C-TCP의 성능 향상을 위한 네트워크 적응적 혼잡제어 기법

  • 오준열 (광운대학교 전자통신공학과) ;
  • 윤두열 (광운대학교 전자통신공학과) ;
  • 정광수 (광운대학교 전자통신공학과)
  • Received : 2015.07.13
  • Accepted : 2015.10.11
  • Published : 2015.12.15
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Abstract

While today's networks have been shown to exhibit HBDP (High Bandwidth Delay Product) characteristics, the legacy TCP increases the size of the congestion window slowly and decreases the size of the congestion window drastically such that it is not suitable for HBDP Networks. In order to solve this problem with the legacy TCP, many congestion control TCP mechanisms have been proposed. C-TCP (Compound-TCP) is a hybrid TCP which is a synergy of delay-based and loss-based approaches. C-TCP adapts the decreasing rate of the delay window without considering the congestion level, leading to degradation of performance. In this paper, we propose a new scheme to improve the performance of C-TCP. By controlling the increasing and decreasing rates according to the congestion level of the network, our proposed scheme can improve the bandwidth occupancy and fairness of C-TCP. Through performance evaluation, we show that our proposed scheme offers better performance in HBDP networks as compared to the legacy C-TCP.

오늘날 네트워크는 HBDP (High Bandwidth Delay Product) 특징을 가지고 있으며, 기존 TCP는 혼잡 윈도우 크기의 느린 증가와 패킷 손실 시 급격한 감소로 인하여 HBDP 네트워크에 적합하지 못하다. 기존 TCP의 문제를 해결하기 위해 새로운 혼잡 제어 기법에 관한 많은 연구들이 진행되었다. C-TCP (Compound-TCP)는 손실기반 TCP와 지연기반 TCP를 결합한 하이브리드 TCP이다. C-TCP의 목적은 빠른 대역폭 점유, 조기 혼잡예측에 의한 혼잡 방지와 공정성 보장이다. 하지만 C-TCP는 혼잡 정도를 고려하지 않는 지연 윈도우 감소율을 적용하기 때문에 성능의 저하를 초래한다. 제안하는 기법은 네트워크의 혼잡 상태에 따라 적응적으로 지연 윈도우의 증감률을 조절함으로써 C-TCP의 대역폭 점유 효율과 공정성을 개선한다. 실험 결과를 통해 HBDP 네트워크에서 제안하는 기법이 기존 C-TCP보다 향상된 성능을 보임을 확인하였다.

Keywords

Acknowledgement

Grant : 방송용 영상 인식 기반 객체 중심 지식융합 미디어 서비스 플랫폼 개발

Supported by : 정보통신기술진흥센터

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