Please use this identifier to cite or link to this item: http://scholarbank.nus.edu.sg/handle/10635/16459
Title: Performance analysis of TCP and TCP-friendly rate control flows in wired and wireless networks
Authors: SANTHANAM RANGANATHAN SUDHARSANAN
Keywords: ECN, BECN, TCP, TFRC, Performance Analysis, Wired and Wireless Networks
Issue Date: 23-Apr-2004
Source: SANTHANAM RANGANATHAN SUDHARSANAN (2004-04-23). Performance analysis of TCP and TCP-friendly rate control flows in wired and wireless networks. ScholarBank@NUS Repository.
Abstract: This thesis addresses two significant problems namely: analysis of TCP-friendly rate control protocol (TFRC) flows through real-time measurements, and evaluation of Explicit Congestion Notification (ECN) and Backward Explicit Congestion Notification (BECN) enabled TCP flows. With the rapid increase of multimedia traffic and the deployment of real-time audio/video streaming applications, the current Internet has seen an exponential increase in the percentage of non-TCP traffic. These multimedia streaming applications does not guarantee congestion control in a a??TCP-friendlya?? manner, in particular, they do not share the available bandwidth fairly with applications built on TCP, such as web browsers, FTP, or e-mail clients. With the advent of this, the Internet community strongly believes that this evolution could lead to a congestion collapse and starvation for TCP traffic. As a result TCP-friendly protocols have been developed that behave fairly with respect to co-existent TCP flows. Currently, there are many such TCP-friendly protocols thriving to provide a??TCP-friendlinessa?? (both unicast as well as multicast). It is important to study and analyze the behavior of TCP-friendly flows where a significant amount of multimedia traffic need to be handled in the future Internet. The first part of this thesis studies and analyses the TFRC flows through real-time passive measurements. This study leads to some interesting observations such as: the aggregate traffic exhibits long-range dependence (LRD) over different levels of aggregation, packet inter-arrival times tend to be correlated, and there exists a correlation between packet loss and delay. However, this analysis is applicable only to wired networks. The second part of this thesis presents an evaluation of ECN and BECN enabled TCP flows. In this study a throughput expression for the case of BECN as a function of packet marking probability (p) and round trip time (RTT) is obtained. This thesis then evaluates comparative performance of the ECN and BECN mechanisms using homogeneous long-lived FTP flows. This comparative performance evaluation is done for varying network load, for different bandwidth-delay product networks, reverse lossy links, and for single- as well as multiple-bottleneck networks. Experiments in this thesis show that BECN mechanism benefits from its early congestion notification via ICMP source quench messages. For paths that have large bandwidth-delay product, it shows that BECN mechanism offers significant improvement in throughput for bulk transfers, and also that packet drops are comparatively reduced, compared to ECN mechanism.
URI: http://scholarbank.nus.edu.sg/handle/10635/16459
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