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
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
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