Institute of Computer Science
Georg-August-Universität Göttingen
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Informatik-Kolloquium: CPM: Combining the power of multicast and P2P for Video-on-Demand
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We are pleased to welcome Dr. Kadangode K (K. K.) Ramakrishnan's visit to NET group and give a colloquium talk on June 12, 2008, 10:15-12:00, Sternwarte. |
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Title: CPM: Combining the power of multicast and P2P for Video-on-Demand
Speaker: K. K. Ramakrishnan Abstract: We present Cooperative Peer-assists and Multicast(CPM), a unified approach that exploits server multicast, assisted by peer downloads, to provide efficient video-on-demand (VoD) in a service provider environment. We describe our architecture and show how CPM is designed to dynamically adapt to a wide range of situations including highly different peer-upload bandwidths, content popularity, user request arrival patterns (including flash-crowds), video library size, and subscriber population. CPM also seeks to be cognizant of the network topology, so as to be efficient in using network resources. We demonstrate the effectiveness of CPM using simulations (based on the an actual implementation codebase) across the range of situations described above and show that CPM does significantly better than traditional unicast, different forms of multicast, as well as an idealized peer-to-peer scheme. --- Dr. K. K. Ramakrishnan (http://www.research.att.com/info/kkrama) received his Ph.D. in Computer Science from the University of Maryland, College Park in 1983. His interests lie in performance and architectural issues of computer networks, with current focus on a range of topics spanning from overlay networks and multimedia distribution to transport and link layer protocols to be robust against loss. His paper "A Binary Feedback Scheme for Congestion Avoidance in Computer Networks with a Connectionless Network Layer" published in ACM SIGCOMM 1988 received the ACM SIGCOMM Test of Time Paper Award in 2006, and was recognized as one of the top innovations in networking in the last 25 years and republished by ACM SIGCOMM Computer Communications Review in its 25th Anniversary Issue (Jan. 1995). More recently, he has served as a General Co-Chair for the IEEE LANMAN 2007 Workshop, TPC Co-chair of 3rd ACM/IEEE Symposium on Architectures for Networking and Communications Systems (ANCS 2007) and is TPC Co-Chair for IEEE ICNP 2008. Dr. Ramakrishnan is an IEEE Fellow (2005) "for contributions to congestion control and traffic management in communication networks", and an AT&T Fellow (2006), recognized for his "fundamental contributions to communications networks with lasting impact on AT&T and the industry, including congestion control, traffic management and VPN services". |
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