An architecture for multicast telepresentations
Jim Gemmell, Eve M. Schooler, Roger G. Kermode · Hrčak Portal of scientific journals of Croatia (University Computing Centre) · 1998
We have developed a scalable reliable multicast architecture for delivering oneto -many telepresentations. Whereas the transport for interactive real-time audio and video is concerned with timely delivery, other media, such as slides, images and animations require reliability. We propose to support reliability by combining multicast with forward error correction (FEC), as well as additional techniques depending on the nature of the data. Two related but distinct protocols are used for dynamic and persistent session data. For dynamic session data, we use erasure-correcting scalable reliable multicast (ECSRM), an enhanced version of SRM by Floyd et al. that is based on NACK suppression, but improves scalability and rate control. Session-persistent data is delivered using Fcast, a protocol that combines FEC and data carouseling with no backchannel from receiver to sender. Our approach is scalable to large heterogeneous receiver sets, and supports late-joining receivers. We have implemente...