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Multi-Path Video Transport Over Ad-Hoc Network

Multi-Path Video Transport Over Ad-Hoc Network. IEEE Wireless Communications August 2005 報告者： 李冠群. Outline. Introduction Architecture Overview Multi-Stream Video Coding Multi-Path Routing Transport mechanism Simulation Conclusion. 1. Introduction. 1. Introduction.

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Multi-Path Video Transport Over Ad-Hoc Network

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  1. Multi-Path Video Transport Over Ad-Hoc Network IEEE Wireless Communications August 2005 報告者： 李冠群

  2. Outline • Introduction • Architecture Overview • Multi-Stream Video Coding • Multi-Path Routing • Transport mechanism • Simulation • Conclusion

  3. 1. Introduction

  4. 1. Introduction • Real-time video overAd-Hoc network

  5. 1. Introduction • Real-time multimedia: • Stringent QoS request • (bandwidth, delay, loss) • Wireless ad-hoc network: • Frequent link failure & congestion • Transmission error • Combine  challenge!

  6. 1. Introduction • Overcome: • Multi-path transport(user multiple path in parallel for a real-time multimedia session)

  7. 1. Introduction • Multi-Path transport Sender Receiver

  8. 1. Introduction • Multi-Path transport Sender Receiver

  9. 2. Architecture Overview

  10. 2. Architecture Overview • Provide multi-path transport: • Multi-Stream video coding • Multi-Path routing • Transport mechanism

  11. 2. Architecture Overview • Point-to-point

  12. 2. Architecture Overview • Design Trade-off • Advantage: • Path diversity • Low congestion & delay • Disadvantage • Higher coding redundancy • Higher computation complexity • Higher control traffic overhead

  13. 3. Multi-Stream Video Coding

  14. 3. Multi-Stream Video Coding

  15. 3. Multi-Stream Video Coding • Three approach: • Feedback-based reference picture selection • Layered Coding with Selective ARQ • Multiple Description Coding

  16. 3. Multi-Stream Video Coding • a. Feedback-based reference picture selection: • Disperse a stream onto multiple paths(Even bit  path 1, Odd bit  path 2) • Select the reference picture according feedback

  17. 3. Multi-Stream Video Coding • a. Feedback-based reference picture selection:

  18. 3. Multi-Stream Video Coding • b. Layered Coding with Selective ARQ. • Layer coding (base layer, enhancement layer) • Selective ARQ for base layer • Retransmission using the enhancement layer path

  19. 3. Multi-Stream Video Coding • b. Layered Coding with Selective ARQ.

  20. 3. Multi-Stream Video Coding • c. Multiple Description Coding • multiple equally important descriptions • Two streams can decode independently

  21. 3. Multi-Stream Video Coding

  22. 4. Multi-Path routing

  23. 4. Multi-Path routing

  24. 4. Multi-Path routing • Source routing: DSR • SCTP • Application-layer routing (overlay)

  25. 5. Transport mechanism

  26. 5. Transport mechanism

  27. 5. Transport mechanism • Multifllow Real-Time Transport Protocol(MRTP) • Support the general multipath transport architecture for real-time multimedia app. • Real-time traffic • multipath transport • Dynamic add/remove path according QoS feedback

  28. 5. Transport mechanism

  29. 5. Transport mechanism • MRTP

  30. 6. Simulation

  31. 6. Simulation • Use MDMC + DSR + MRTP/MRTCP

  32. 6. Simulation Single path 30.19dB Multipath path 31.45dB

  33. 7. Conclusion • Multipath is better then single-path • Can use in wide mesh network (ex. internet)

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