PhD Viva

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Slides for PhD Defense

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PhD Viva

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

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