1. A FAST CHANNEL SWITCHING SYSTEM FOR IPTV BASED ON MULTI-CHANNEL PREVIEW 指導教授： 鍾添曜 學生： 961432 謝征歷 961419 王筱誼

2. OUTLINE Introduction Design Simulation Conclusion

3. I NTRODUCTION The rapid development of technology in P2P Multimedia Streaming System. PPLive, PPStream Real-Time Playback Video-On-Demand user has more and more choice to watch favorite channel increase the frequency of channel switching

4. INTRODUCTION Goals: 1). Help users find their favorite channel fast. 2). Decrease the bandwidth consumption 3). Reduce the server's overhead and the peer's connection delay 4). Provide a stable quality

5. HPMP FOR P2P MULTIMEDIA STREAMING SYSTEM propose a High Performance Multi-channel Preview (HPMP)

6. HPMP FOR P2P MULTIMEDIA STREAMING SYSTEM Preview mode Watch mode CH 1 data CH 2 data CH 3 data CH 4 data Video serverTrack server leader Aleader B

7. TFS leader receives the data from watch node, and the leader push the data to the children. leader will automatically take the next C resource nodes limits the depth of tree to increase the stability of Preview mode 1 2 3 4 5 6 7 8 9 10 11 12 … new node (leader) Channel leader

8. Simulation Simulations for different upload bandwidth distributions using network simulator OMNeT++ full quality video stream :2Mbps low quality of the stream:128Kbps The number of channels is 20 The number of peers is 200 A period of auto-changing 4 channels of low quality video is 8 seconds

9. Simulation Upload B/WSN 1SN 2SN 3SN 4 0.5Mbps(peers)20100 1Mbps(peers)3050 2Mbps(peers)5030 3Mbps(peers)10020 Tree ’ s depth 106 12 Average hop distance time(sec) HPMP78.3846.6160.0370.68 Traditional mode 139.12145.31 Tab.1.Scenarios for comparing different tree depth and different upload bandwidth under HPMP and Traditional mode

10. Simulation Fig.1.Statistics for number of joining peers Fig.2.the cumulative number of peers finding favorite channel in different tree’s depth under HPMP

11. Conclusion we provide a novel method named HPMP from different angles to improve channel change time in P2P live media streaming. HPMP reduces the hop distance time efficiently and decreases the tracker server’s overhead

12. T HANK YOU