A Feedback Control Model for Managing Quality of Service in Multimedia Communications
Abstract
Advances in Internet Protocol (IP) multicasting provide a rich background for support of IP
multipoint collaborative communications. IP multicast applications have traditionally been deployed over
wired networks, however, new wireless technologies such as Local Multipoint Distribution Service (LMDS)
are currently emerging as transport mechanisms for wireless video, voice, and application sharing environments.
For multimedia wireless services to effectively evolve, management tools that can support Quality of
Service (QoS) adaptation of increasingly complex network resources and customer application profiles are
needed. In this paper, we present a control model which provides response time and bandwidth requirement
adaptation of audio, video, and application sharing multipoint IP teleconferences for emerging wireless
multimedia communications. Our study is innovative in that it integrates feedback controls between the
application and network layers. Our model is based on revealing feedback controls for multimedia call
preparation and subsequent real-time connection control. Case-based reasoning memory is used to match
real-time congestion (connection) controls with call preparation controls and user profiles for improved
QoS. Network agents are used to capture user and multimedia teleconference application call profiles at the
application layer and transfer them to the case memory. Real Time Protocol (RTP) statistics are used to
identify connection management feedback controls at the network layer. Receiver-based, real-time adaptation
at the network layer and above is possible through the use of a hierarchical coding technique. The
proposed adaptive management architecture is based upon a case memory representation of call preparation
feedback controls, RTP feedback controls for providing audio stream bandwidth adaptation, and configuration
descriptions for integrated experiments. We conclude that implementation of these techniques should
lead to improved QoS of wireless IP multipoint teleconferences.
Rights
This publication is a work of the U.S. Government as defined in Title 17, United States Code, Section 101. Copyright protection is not available for this work in the United States.Collections
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