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Fairness evaluation experiments for multicast congestion control protocols

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2 Author(s)
Seada, K. ; Dept. of Electr. Eng. Syst., Univ. of Southern California, Los Angeles, CA, USA ; Helmy, A.

Fairness to current Internet traffic, particularly TCP, is an important requirement for new protocols in order to be safely deployed in the Internet. This specifically applies to multicast protocols that should be deployed with great care. In this paper we provide a set of experiments that can be used as a benchmark to evaluate the fairness of multicast congestion control mechanisms when running with competing TCP flows. We carefully select the experiments in such a way to target specific congestion control mechanisms and to reveal the differences between TCP and the proposed multicasting protocol. This enables us to have a better understanding oft he proposed protocol behavior and to evaluate its fairness and when violations can happen. To clarify our experiments we carry them on a single-rate case study protocol, pgmcc, using NS-2 simulations. Our analysis shows the strengths and potential problems of the protocol and point to possible improvements. Several congestion control mechanisms are targeted by the experiments such as timeouts, response to ACKs and losses, independent and congestion losses effect. In addition, we evaluate multicast mechanisms such as the effect of multiple receivers, group representative selection, and feedback suppression when there is network support.

Published in:

Global Telecommunications Conference, 2002. GLOBECOM '02. IEEE  (Volume:3 )

Date of Conference:

17-21 Nov. 2002