The goals of the NSF-funded UltraGrid project were to enhance the state
of the art in high quality, large scale, telepresence systems and to
enable flexible and ad-hoc remote collaboration.
The Mbus protocol specification has been published by the IETF
as RFC 3259.
Provision of congestion control is a significant open issue for
interactive real-time networked multimedia systems. Numerous
congestion control algorithms have been proposed, but they frequently
conflict with the demands of interactive multimedia applications. My
paper “Building
Adaptive Applications: On The Need For Congestion Control”
(an invited paper presented at the 17th SPIE/IS&T International
Symposium on Electronic Imaging, San Jose, CA, USA, January 2005)
outlines some of the issues.