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A Novel Schema for Multipath Video Transferring Over Ad Hoc Networks

Pejman Panahi et al. , IEEE UBICOMM, 2008. A Novel Schema for Multipath Video Transferring Over Ad Hoc Networks. Reporter ：陳琬婷. Date ： 2009/3/30. Outline. Introduction Related Works Multipath multimedia transport architecture RPS LC MDC Architecture Simulation Conclusion.

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A Novel Schema for Multipath Video Transferring Over Ad Hoc Networks

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  1. Pejman Panahi et al., IEEE UBICOMM, 2008 A Novel Schema for Multipath Video Transferring Over Ad Hoc Networks Reporter：陳琬婷 Date：2009/3/30

  2. Outline • Introduction • Related Works • Multipath multimedia transport architecture • RPS • LC • MDC • Architecture • Simulation • Conclusion

  3. Introduction • Ad hoc networks • Wireless Mobile Networks • mobile nodes cooperate with each other to find routes and relay packets.

  4. Introduction • Face Problems • High transmission error rate • Shadowing • Fading • Path loss • Interference • Link failures

  5. Related Works • A general architecture for multipath transport

  6. Related Works Reference picture selection • Reference picture selection (RPS) • Select the reference picture • Feedback control • Estimated path status • Coding efficiency • Error resilience

  7. Related Works Layered coding technique • Layered coding technique • Base layer • Provide low but acceptable quality. • It is important part • Enhancement layers • Provide high or low quality. • It is cannot without the base layer. Media File 取樣頻率：100k File1 取樣頻率：30k File2 取樣頻率：45k File3 取樣頻率：15k Base layer Enhancement layers

  8. Related Works Multiple description coding • Multiple description coding (MDC) • Multiple equally important description.

  9. Architecture Assumption • Assumption： • Using video proxy nodes • Proxy node should able to realize and recognize stream. • Node should have capability for realizing stream structure and different part. Proposed Schema

  10. Architecture Path selection • Path Selection • Using AOMDV protocol • To select two paths • To select proxy nodes

  11. Architecture • Feedback control • 1:packet loss or failure • 2:failure in packets or connection • 3:need frames / packets Stream schema and feedback

  12. Simulation • Simulation • H.264 • QCIF(176*144) • fps 10 • NS-2

  13. Simulation • Single path v.s. Multipath

  14. Simulation • Proxy nodes v.s. Without proxy nodes (Ⅰ)

  15. Simulation • Proxy nodes v.s. Without proxy nodes (Ⅱ)

  16. Conclusion The paper we offered a novel schema for multipath video transferring over ad hoc networks. Simulation Results shows that these nodes can improve video quality if they situated in suitable places of network.

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