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Enhancing Multimedia Traffic Management: TCP-Friendly Protocols and Flow Control Techniques

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  1. Better-Behaved Multimedia Networking Keith Barber Jason Ingalsbe Joel Thibault Prof. Mark Claypool (Advisor) April 19, 2001

  2. 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

  3. Existing Alternatives • TCP-Friendly Rate Control (TFRC) • TCP Emulation At Receivers (TEAR) • MM-Flow

  4. 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

  5. Evaluation Techniques • Simulation Scenarios • Standard Bottleneck Layout • Standard Delay Layout • Standard Fragile Layout

  6. Standard Bottleneck Layout

  7. Standard Delay Layout

  8. Standard Fragile Layout

  9. Effects of Re-Engineering MM-Flow • Responsiveness to Congestion • Fair Share of Bandwidth • Relative Smoothness

  10. MM-App-Old vs. TCP

  11. MM-App-New vs. TCP

  12. Further Evaluation of MM-App-New • Packet Size • Number of Scale Values • Delay • Fragile Flows • Weighted Scale Values

  13. 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

  14. TCP-Friendly Equation • Implications and Assumptions: • Packet Drop Rate • Measurement Interval Size

  15. TCP-Friendly Results (1 sec.)

  16. TCP-Friendly Results (3 sec.)

  17. TCP-Friendliness of MM-App-New

  18. TCP-Friendliness of TFRC

  19. Multi-Protocol Layout

  20. Multi-Protocol Env. (TCP)

  21. Multi-Protocol Env. (TFRC)

  22. Multi-Protocol Env. (MM-App-New)

  23. 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

  24. Questions? http://www.wpi.edu/~jmi725/mqp http://perform.wpi.edu

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