Journal of KIISE:Information Networking (한국정보과학회논문지:정보통신)

Korean Institute of Information Scientists and Engineers (한국정보과학회)
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Performance Evaluation for TCP/IP over UBR

UBR 위에서 동작하는 TCP/IP 성능 평가

  • 안성수 (부경대학교 정보통신공학과) ;
  • 유흥식 (부경대학교 정보통신공학과) ;
  • 황선호 (한국전파기지국관리(주) 기술연구소) ;
  • 이준원 (안동대학교 정보통신공학과) ;
  • 김성운 (부경대학교 정보통신공학과)
  • Published : 2000.03.15
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Abstract

ATM is a key technology of integration of multimedia service. Recently, Many study have been concentrated on performance testing for evaluation network performance are stronger everyday. The performance testing is on evaluation of maximal throughput of network by measuring and analyzing of various performance parameters. There are two ways to test ATM network performance; one is using QoS in cell level on the point of network's view, and the other is using metric in frame level in the point of user's view. And, the standardization process is also under way. In this paper, we derive a performance requirement of TCP in TCP/IP data transmission over ATM UBR service. By applying the derived requirements to ATM and packet networks, we evaluate the performance of TCP over UBR based on the result of our simulations. Therefore, we evaluate the result of simulation and find degradation of network throughput by interaction between TCP congestion control and ATM cell drop policy. So we suggest the accelerated Vegas that modify traditional TCP Vegas in congestion control mechanism for batter network throughput.

멀티미디어 서비스 통합에 대한 핵심적 기술로 ATM기술이 각광을 받게됨에 따라 이에 대한 검증 및 사용자에게 일정 수준의 신뢰성을 보장하기 위해서 다양한 성능 인자를 측정하고 이를 분석함으로써 수행가능한 망의 최대 수율, 즉 망의 성능을 평가하는 성능 시험에 대한 관심과 중요성이 점점 높아지고 있는 추세이다. ATM 망의 성능 시험 및 평가는 망의 관점에서 셀 레벨의 QoS를 이용하는 방법과 사용자 관점에서 프레임 레벨의 메트릭을 이용하는 방법이 있으며, 현재 이에 대한 표준화가 진행중이다. 본 논문에서는 ATM UBR 서비스를 통해서 TCP/IP를 수용하기 위해 TCP 측면에서의 성능 요구사항을 추출하고, 이를 ATM 망 및 패킷망에 적용시켜 시뮬레이션을 수행하였다. 시뮬레이션을 통해 성능을 분석 및 평가한 결과, TCP혼잡제어 기법과 ATM 셀 폐기 정책간의 상호 작용 문제로 인해 전체적인 성능을 낮게 측정되었으며, 이에 대한 개선 방안으로 기존 TCP 혼잡제어 기법 연구에서 제안된 TCP Vegas를 발전시킨 Accelerated Vegas를 제안한다.

Keywords

References

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