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Receiver Initiated Just-In-Time Adaptation for Rich Media Distribution
Xu, Zhichen; Tang, Chunqiang; Wang, Zhiheng; Banerjee, Sujata; Lee, Sung-Ju
HPL-2002-314R1
Keyword(s): streaming media; overlay network; multicast
Abstract: Application-level multicast networks overlaid over unicast IP networks are increasingly gaining in importance. While there have been several proposals for overlay multicast networks, very few of them focus on the stringent requirements of real-time applications such as streaming media. We propose an efficient overlay application layer multicast infrastructure for multimedia real-time applications based on a combination of landmark clustering and RTT measurements. Our goal is to balance the network- oriented goals of building an efficient multicast tree with the application-oriented goals of providing good QoS with minimal disruptions. Using accurate global soft state information tables, our approach promptly constructs and reconfigures high quality trees. A distinguished feature of our approach is that the tree reconfiguration is initiated just-in-time by the application client at the receiver when the media quality falls below a specific threshold. The goal is to achieve dynamic tree reconfiguration with very low switching delay such that end users do not perceive any application performance degradation.
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