Is the Internet Ready for Multimedia?

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Is the Internet Ready for Multimedia?

• Ahmed Helmy
• University of Southern California

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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

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• 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

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Supply vs. Demand

• 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

Demand is a moving target. We need to be flexible
and think ahead. Whats the next killer app.?
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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

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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?

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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

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Are we ready? (Answer)

• Of course not
• We have a lot more work to do!