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Better-Behaved Multimedia Networking. Keith Barber Jason Ingalsbe Joel Thibault Prof. Mark Claypool (Advisor) April 19, 2001. Issues with Multimedia Traffic. Basic Internet protocols inappropriate for multimedia TCP does not provide smooth transmission UDP takes up too much bandwidth
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Better-Behaved Multimedia Networking Keith Barber Jason Ingalsbe Joel Thibault Prof. Mark Claypool (Advisor) April 19, 2001
Issues with Multimedia Traffic • Basic Internet protocols inappropriate for multimedia • TCP does not provide smooth transmission • UDP takes up too much bandwidth • Multimedia protocols must be TCP-friendly
Existing Alternatives • TCP-Friendly Rate Control (TFRC) • TCP Emulation At Receivers (TEAR) • MM-Flow
Re-Engineering MM-Flow • Location of flow control logic • “True” application and transport layers • Receiver decides whether scale value should change • Sender converts scale values to transmission rate • Number of scale values • Weighted average scale
Evaluation Techniques • Simulation Scenarios • Standard Bottleneck Layout • Standard Delay Layout • Standard Fragile Layout
Effects of Re-Engineering MM-Flow • Responsiveness to Congestion • Fair Share of Bandwidth • Relative Smoothness
Further Evaluation of MM-App-New • Packet Size • Number of Scale Values • Delay • Fragile Flows • Weighted Scale Values
TCP-Friendly Flows • Possible definitions: • Flow uses fair share of bandwidth • Flow responds to congestion • Flow transmission rate less than or equal to TCP flow transmission rate • Quantitative measurement is desired
TCP-Friendly Equation • Implications and Assumptions: • Packet Drop Rate • Measurement Interval Size
Conclusion and Future Work • MM-Flow is an improvement over original • Areas for future research: • Increase transmission rate quickly at startup • Decrease fluctuation in transmission rate • Continue examination of TCP-Friendliness
Questions? http://www.wpi.edu/~jmi725/mqp http://perform.wpi.edu