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PhD Viva

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Slides for PhD Defense

Education
1 of 6
Congestion Control for Real-time Interactive Multimedia Streams UCL Computer Science Soo-Hyun Choi 15/12/2010
thesis question 2 Is congestion control mechanism useful to interactive real-time multimedia applications? Why congestion control mechanisms are not deployed in such applications?
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?
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 ,[object Object],due to the interaction issues between codec and CC i.e., these have masked advantages and disadvantages at the same time 4
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.
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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PhD Viva

  • 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.
  • 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