Computer Systems Laboratory Colloquium
4:15PM, Wednesday, Nov 11, 1998
NEC Auditorium, Gates Computer Science Building B03
A Scalable Multicast Architecture for Telepresentations
Jim Gemmell
Microsoft Research
About the talk:
We have developed a scalable reliable multicast architecture for
delivering one-to-many telepresentations. In contrast to audio and
video, which are often transmitted unreliably, other media, such as
slides, images and animations require reliability. Our approach
transmits the data in two layers. One layer is for session-persistent
data, with reliability achieved by FEC alone, using the Fcast protocol. The other layer is for dynamic data, with reliability achieved using the ECSRM protocol, which combines FEC with NACK suppression. Our approach is scalable to large heterogeneous receiver sets, and supports late-joining receivers. We have implemented our approach in a multicast version of PowerPoint, a graphical slide presentation tool.
About the speaker:
Jim Gemmell is a researcher in the Microsoft
Research Telepresence Research Group - a part of the Bay Area Research Center (BARC) in San
Francisco. He received his Ph.D. and B.Sc. from Simon Fraser University and his M. Math
from University of Waterloo (all in computer science). His research interests include
telepresence, telepresentations, digital audio and video storage/retrieval, and reliable
multicast. He produced the on-line version of the ACM 97 conference.
Contact information:
Jim Gemmell
301 Howard St. #830
San Francisco, CA
94105
415 778 8224
jgemmell@microsoft.com