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Is the Internet Ready for Multimedia ?

Is the Internet Ready for Multimedia ?. Ahmed Helmy University of Southern California. Is the Internet Ready for Multimedia ?. What is Multimedia ? Common: Real-time/streaming (audio/video) More general: Multiple requirements (QoS) by different applications

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Is the Internet Ready for Multimedia ?

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  1. Is the Internet Ready for Multimedia? Ahmed Helmy University of Southern California

  2. Is the Internet Ready for Multimedia? • What is Multimedia? • Common: Real-time/streaming (audio/video) • More general: Multiple requirements (QoS) by different applications • What are these requirements? • End-to-end metrics: Reliability, Delay, Jitter, least cost! • Aggregate metrics: Least congestion, maximum utilization, fair, minimum energy! • Is Internet-supported emergency service MM? • Need very high priority service

  3. What is the Internet? • Wired • Last hop wireless (cellular, access points, space optics and pico cells) • Mobile (continuous vs. intermittent) • Multi-hop wireless (Ad hoc) • other… ! • Different network characteristics provide different challenges for various requirements • Need to understand characteristics of these networks • Need models for: topology, traffic, channel, mobility …

  4. Supply Infrastructure (e.g., ISPs, content providers) Architecture/protocols IntServ DiffServ Hybrid! Business and pricing models??? Demand (those who need QoS) Audio, video, collaborative virtual env. Multicast Dense-mode, Sparse-model, source-specific Inter-domain? (BGMP) Current: PIM-SM, MDSP, SSM ! P2P: effect on network New paradigms Ad hoc/Sensor networks Active networks Supply vs. Demand Demand is a moving target. We need to be flexible and think ahead. What’s the next killer app.?

  5. Are we ready? (Questions) • What does QoS mean without end-to-end deployment of IntServ or DiffServ? • Can we over-provide resources? • What resources? Bandwidth, computation (servers), energy ! (sensor nets) • Can we over-provide everywhere? • Will the solution be a hybrid approach • Over-provisioning when/where possible • QoS architecture otherwise • What about DoS attacks? • Need fairness and isolation of misbehavior

  6. Are We Ready? (more Qs) • We talk about network-side QoS • What about protocol-side QoS? • If the network is not congested, can we guarantee protocol behavior? • We need better approaches to design predictable protocols • Can we provide a parallel of circuit-design CAD tools?

  7. What about emerging networks? • Example: • Multicast in large-scale ad hoc networks • How to rendezvous in an infrastructure-less network? • Need to re-think bootstrap and resource discovery • Need to re-think routing in a highly dynamic env. • Should we think about it when we do not know how to do it in the wired network? • Good intellectual exercise that has potential

  8. Are we ready? (Answer) • Of course not • We have a lot more work to do!

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