Where is Multicast Today? (An introduction to the Editorial Note by Neumann, Roca and Walsh on Large Scale Content Distribution Protocols ) Ernst W. Biersack Institut Eurecom Sophia Antipolis, France erbi@eurecom.fr 1. INTRODUCTION D2, D3 to a multicast group consisting of 3 receivers. When each of the receiver looses a single but di erent packet, the retransmission of original data would require the sender to retransmit all 3 packets D1 D3. Using FEC, the sender transmits a single parity packet P that consists of the bit-wise Exclusive OR of the data portion of packets D1 D3. The successful reception of P will allow all 3 receivers to reconstruct their missing data packet. Given these di erent elements of error control, the designer of a reliable multicast error control protocol has a large number of possibilities. As a consequence, the research community has come up with a variety of reliable multicast error control protocols. My favorite protocol, call it RMC, is one that does (i) loss detection at the receiver, (ii) uses NAKs with probabilistic feedback suppression [5], and has (iii) the sender retransmit parity packets for loss recovery. RMC has a couple of interesting and useful properties: It
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Where is multicast today?
Biersack, Ernst W.
Follow ACM SIGCOMM Computer Communication Review
, Volume 35 (5)
Association for Computing Machinery – Oct 6, 2005
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