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| Papers and Publications |
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Title:
Layered Transmission and Caching for
the Multicast Session Directory Service
Author(s):
Andrew Swan, Steven McCanne and Lawrence A. Rowe
Affiliation:
University of California, Berkeley
Computer Science Division - EECS
Presentation:
Proc. of The Sixth Annual ACM Intl. Multimedia Conf., Bristol, England, September 1998.
Best Student Paper award.
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Abstract
The recent advent of the Internet Multicast service has enabled a number of successful real-time multimedia applications, yet the scalability of these applications remains challenged by the inherent heterogeneity of the underlying Internet. One promising approach for taming this heterogeneity is to encode each media flow as a layered signal that is striped across multiple multicast groups, thereby allowing a receiver to tune its individual reception rate by modulating its subscription to multicast groups. Though significant progress had been made on media transport protocols and congestion control strategies for adjusting multicast groups in this fashion, comparatively little work has been devoted to extending the session directory service and address allocation architecture to meet the needs and requirements of layered media. Moreover, the large-scale deployment of layered media formats is hindered by the lack of support for layered formats in existing session directory tools. To overcome these limitations, we propose a new architecture for session advertisement and caching that exploits multicast "administrative scope'' through protocol proxies to admit layered media formats and reduce the start-up latency of a directory-service client by an order of magnitude or more. Our architecture is fully compatible with the existing directory service allowing our implementation, which is split across a new session directory tool and network proxy, to be incrementally deployed within the current Internet multimedia conferencing architecture. |
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