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PhD Viva
PhD Viva
PhD Viva
PhD Viva
PhD Viva
PhD Viva
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PhD Viva

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Slides for PhD Defense

Slides for PhD Defense

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Transcript

  • 1. Congestion Control for Real-time Interactive Multimedia Streams
    UCL Computer Science
    Soo-Hyun Choi
    15/12/2010
  • 2. thesis question
    2
    Is congestion control mechanism useful to interactive real-time multimedia applications?
    Why congestion control mechanisms are not deployed in such applications?
  • 3. thesis approach
    Studied available standard – TFRC
    exhibit some limitations due to the issues around being rate-based
    Proposed a better option – TFWC
    meet the same goals as TFRC has aimed, but solve the limitations by re-introducing TCP-like Ack-clock
    3
    Why not Ack-based?
  • 4. thesis conclusions
    In real-world evaluations,
    TFRC wasn’t so bad as we learnt from prev. works
    TFWC wasn’t so great either as we’d expected
    • both have seemed to work fine
    due to the interaction issues between codec and CC
    i.e., these have masked advantages and disadvantages at the same time
    4
  • 5. what TFWC buy?
    5
    Simpler to implement in a real application
    i.e., no need to worry about the host’s clocking issues
    It can be a more feasible option when there is a choice.
  • 6. is CC useful?
    6
    Overall, YES!
    as they are able to control the codec’s bit rate dynamically depending upon network status,
    giving optimal (better) image quality

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