Error Control using Retransmission Schemes in Multicast Transport Protocols for Real-time Media (1996) [29 citations — 0 self]
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@ARTICLE{Pejhan96errorcontrol,author = {Sassan Pejhan and Mischa Schwartz and Dimitris Anastassiou},
title = {Error Control using Retransmission Schemes in Multicast Transport Protocols for Real-time Media},
journal = {IEEE/ACM Transactions on Networking},
year = {1996},
volume = {4},
pages = {413--427}
}
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Abstract:
We analyze different retransmission schemes for Error Control in multicast protocols geared towards real-time, multimedia applications. We discuss why retransmission schemes are not inappropriate for such applications, but in fact can be quite effective. We present a quantitative analysis of such schemes, as well as simulation results, taking into account four different parameters (and not just the source throughput): 1) The probability of dropping a packet due to limited time for retransmissions, 2) the average time required to deliver a packet correctly to end receivers, 3) the number of times a packet will be retransmitted and 4) the cost to the network, in terms of packet duplications, of retransmitting a packet. We reach the counter-intuitive conclusion that the optimum scheme---in terms of all four of the above parameters---in the most general scenarios (where several hosts with widely varying propagation delays and `quality of connections ' are participating in the session) is to immediately retransmit packets---preferably multicast---upon reception of a NACK from any receiver. We also demonstrate, again through quantitative analysis, the circumstances under which it would be beneficial (as well as those under which it would be counter-productive) to multicast control messages in the hope of suppressing duplicates and preventing the source from being overwhelmed by control messages. 1
