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Author: search.filters.author.Chan, CTSubject: search.filters.subject.congestion control

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Now showing 1 - 4 of 4
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    RedVegas: Performance improvement of TCP Vegas over heterogeneous networks
    (2004-07-01)
    Chan, YC
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    Chan, CT
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    Chen, YC
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    資訊工程學系
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    Department of Computer Science
    Current IP network has become the dominant paradigm for all networking environments. The significant cause of packet losses in such heterogenous networks is no longer limited to network congestion. Traditional TCP interprets every packet loss as caused by congestion which may be not the case in the current Internet. Misinterpretation of wireless random loss as an indication of network congestion results in TCP slowing down its sending rate unnecessarily. In this paper, we propose a new variant of TCP Vegas named RedVegas. By using the innate nature of Vegas and congestion indications marked by routers, RedVegas may detect random packet losses precisely. Through the packet loss differentiation, RedVegas reacts appropriately to the losses, and therefore the throughput of connection over heterogeneous networks can be significantly improved.
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    RoVegas: a router-based congestion avoidance mechanism for TCP Vegas
    (2004-10-15)
    Chan, YC
    ;
    Chan, CT
    ;
    Chen, YC
    ;
    資訊工程學系
    ;
    Department of Computer Science
    Transmission control protocol (TCP) Vegas detects network congestion in the early stage and successfully prevents periodic packet loss that usually occurs in TCP Reno. It has been demonstrated that TCP Vegas outperforms TCP Reno in many aspects. However, TCP Vegas suffers several problems that inhere in its congestion avoidance mechanism, these include issues of rerouting, persistent congestion, fairness, and network asymmetry. In this paper, we propose a router-based congestion avoidance mechanism (RoVegas) for TCP Vegas. By performing the proposed scheme in routers along the round-trip path, RoVegas can solve the problems of rerouting and persistent congestion, enhance the fairness among the competitive connections, and improve the throughput when congestion occurs on the backward path. Through the results of both analysis and simulation, we demonstrate the elfectiveness of RoVegas. (C) 2004 Elsevier B.V. All rights reserved.
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    Performance enhancement of XCP for high bandwidth-delay product networks
    (2005)
    Yang, YR
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    Chan, CT
    ;
    Wang, PC
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    Chen, YC
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    資訊工程學系
    It has been demonstrated that as the per-flow product of bandwidth delay increases, TCP becomes inefficient and unstable, regardless of the queuing discipline. By decoupling utilization control from fairness control, the eXplicit Control Protocol (XCP) outperforms TCP in both conventional and high bandwidth-delay environments. In this article,. we present an efficient flow control scheme based on XCP for high bandwidth-delay product networks. It can shorten the response time and improve the performance of XCP. Simulation results show the effectiveness of our proposed scheme in several performance aspects. Moreover, its implementation is simple enough to fulfill the required criteria of high bandwidth-delay product networks.
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    Smart window adjustment for XCP's congestion management
    (2006)
    Yang, YR
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    Chan, CT
    ;
    Chen, YC
    ;
    Chan, YC
    ;
    資訊工程學系
    In the large bandwidth-delay product (BDP) networks, it has been demonstrated that the eXplicit Control Protocol, XCP, outperforms TCP and remains efficient, fair, and stable. However, once a packet drop is detected, an XCP's congestion management should follow TCP's Van Jacobson congestion control. In other words, congestion window should be halved and the fast retransmission/fast recovery, congestion avoidance algorithms should be applied. In the mean time, congestion window should be reduced by the value of the negative feedback. In this article, we present a smart window adjustment scheme for XCP's congestion management to shorten the response time and improve network performance.