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On Design of Adaptive Internet Streaming Applications: An Architectural Perspective Reza Rejaie

buf0. buf2. buf0. bw (t). bw (t). 2. 2. bw (t). bw (t). 1. 1. bw (t). bw (t). 0. 0. On Design of Adaptive Internet Streaming Applications: An Architectural Perspective Reza Rejaie AT&T Labs – Research Menlo Park, California. Motivation

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On Design of Adaptive Internet Streaming Applications: An Architectural Perspective Reza Rejaie

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  1. buf0 buf2 buf0 bw (t) bw (t) 2 2 bw (t) bw (t) 1 1 bw (t) bw (t) 0 0 On Design of Adaptive Internet Streaming Applications: An Architectural Perspective Reza Rejaie AT&T Labs – Research Menlo Park, California • Motivation • Internet requires all applications to perform end-to-end congestion control • Streaming Applications require iso-chronous processing & QoS. • Lack of high level architecture that properly integrates congestion control. • Target applications: Unicast & non-interactive Internetstreaming applications • Internet Streaming applications should be quality adaptive. • Multimedia Proxy Caching • Multimedia proxy caching(MC) is suited only for playbackstreaming applications • Cache popular streams with “appropriate” quality at a proxy close to interested clients. • Adjust the quality of a cached stream based on clients’ BW and stream’s popularity. • Layered encoding allows fine-grained replacement and fine-grained prefetching. • Fine-grained adjustment in quality of cached streams. • MC achieves scalability, higher delivered quality and higher level ofinteractivity. • Existing Web caches are unable to perform multimedia proxy caching efficiently. • Main Components • Congestion Control(CC) module adjusts transmission rate. • Network-friendly => TCP-friendly, e.g. RAP, TFRC, LDA, … • Error Control (EC) modulerecovers from high priority losses selectively. • Quality Adaptation (QA) module matches the quality with available BW. • Layered encoding. • Contributions • An E2E architecture that integrates CC, EC and QA in a coherent fashion. • Limitations of any E2E architecture. • A proxy-based extended architecture for playback streaming applications. • A simple design methodology for unicast and non-interactive streaming applications. • End-to-End Architecture • Buffering at both ends is used to absorb short-lived changes in BW. • Long-term changes in BW triggers QA. • EC & QA should properly share the BW. • QA determines 1) number of active layers and 2) allocated BW to each layer. • For More Information • http://www.research.att.com/~reza Client Buffer Server Buffer buf2 Ack Ack BW(t) BW(t) + Display Decoder Acker Congestion Control buf1 Internet buf1 Layered Encoder Source BW BW Available BW Quality Adaptation Application Specific Network Specific Application Specific

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