The architecture of a middleware layer for controlling the quality of multimedia sessions

Authors:
Alaa Youssef;Hussein Abdel-Wahab;Kurt Maly
Affiliations:
IBM Thomas J. Watson Research Center, P.O. Box 704, Yorktown Heights, NY 10598, USA;Department of Computer Science, Old Dominion University, Norfolk, VA 23529, USA;Department of Computer Science, Old Dominion University, Norfolk, VA 23529, USA
Venue:
Cluster Computing
Year:
1999

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Abstract

Collaborative multimedia systems demand overall session quality control beyond the level of Quality of Service (QoS) as pertaining to individual streams in isolation of others. To this end, we have recently introduced the concept of Quality of Session (QoSess) control. At every instant in time, the quality of the session depends on the actual QoS offered by the system to each of the application streams, as well as on the relative priorities of these streams according to the application semantics. In this paper, we present the architecture of a middleware layer for controlling the quality of a session. In addition, we describe the inter-stream bandwidth adaptation mechanisms, which are used by the QoSess layer to dynamically control the bandwidth shares of the streams belonging to a session.