Don T. Towsley

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Understanding and modelling packet loss in the Internet is especially relevant for the design and analysis of delay-sensitive multimedia applications. In this paper, we present analysis of hours of endto-end unicast and multicast packet loss measurement. From these we selected hours of stationary traces for further analysis. We consider the dependence as(More)
In this paper we develop a simple analytic characterization of the steady state throughput, as a function of loss rate and round trip time for a bulk transfer TCP ow, i.e., a ow with an unlimited amount of data to send. Unlike the models in [6, 7, 10], our model captures not only the behavior of TCP's fast retransmit mechanism (which is also considered in(More)
Scalability is of paramount importance in the design of reliable multicast transport protocols , and requires a careful consideration of a number of problems such as feedback implosion, retransmission scoping, distributed loss recovery, and congestion control. In this paper, we present a reliable multicast architecture that invokes active services at(More)
Sender-initiated reliable multicast protocols based on the use of positive acknowledgments (ACKs) can suffer performance degradation as the number of receivers increases. This degradation is due to the fact that the sender must bear much of the complexity associated with reliable data transfer (e.g., maintaining state information and timers for each of the(More)
Abstract— We survey recent advances in theories and models for Internet Quality of Service (QoS). We start with the theory of network calculus, which lays the foundation for support of deterministic performance guarantees in networks, and illustrate its applications to integrated services, differentiated services, and streaming media playback delays. We(More)
|In this paper, we develop bounds on the individual session backlog and delay distribution under the Generalized Processor Sharing (GPS) scheduling discipline. This work is motivated by, and is an extension of, Parekh and Gal-lager's deterministic study of the GPS scheduling discipline with leaky-bucket token controlled sessions 15], 16]. Using the(More)
Excessive packet loss rates can dramatically decrease the audio quality perceived by users of Internet telephony applications. Recent results suggest that error control schemes using forward error correction (FEC) are good candidates for decreasing the impact of packet loss on audio quality. With FEC schemes, redundant information is transmitted along with(More)
Since TCP traffic is and may remain as the most popular traffic type in the Internet, it is important to evaluate the performance of TCP in networks employing optical burst switching (OBS), a promising paradigm for the next generation Optical Internet. This work is the first comprehensive study of the TCP performance in OBS networks. Our results provide(More)
The recent success of multicast applications such as Internet teleconferencing illustrates the tremendous potential of applications built upon wide-area multicast communication services. A critical issue for such multicast applications and the higher layer protocols that support them is the manner in which packet losses occur within the multicast network.(More)