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Buddy Internet Exchange

Buddy Internet Exchange. LYU0701. Supervisor:. Professor Michael R. Lyu. Prepared By:. Kwong Kwok Wai - 06545093. Chan Kwan Ho - 06837554. Review of first term. Focus on the transport-layer : Application independent

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Buddy Internet Exchange

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  1. Buddy Internet Exchange LYU0701 Supervisor: Professor Michael R. Lyu Prepared By: Kwong Kwok Wai - 06545093 Chan Kwan Ho - 06837554

  2. Review of first term • Focus on thetransport-layer : Application independent • Network topology discovery could have further benefits to P2P applications

  3. Motivation • Hong Kong is in the progress of switching to High Definition TV Broadcast • Current coverage is not complete • Most recorders could not record two channels simultaneously • High bandwidth requirement to transfer over the Internet

  4. Objective • Build an easy-to-use TV scheduler • Share the TV contents to those who are eligible to watch but not able to receive HDTV signals. • Design a high-speed transfer protocol to optimize the total waiting time and the maximum waiting time

  5. Set-Top Box • A device to decode digital TV signal. • Equipped with network capabilities. • Could record TV programs into a hard disk • Not programmable by 3rd party, so we will simulate it using PC.

  6. Client Application

  7. Network Architecture • Client / Server Model • Fully Decentralized Model • Hybrid Decentralized Model • Efficient peer discovery • Bottleneck at peers only • Minor drawbacks The network formation of a hybrid decentralized model

  8. Client Application • Probe network connection speed for path determination • Probe network port connectivity

  9. Client Application • Easy-to-use GUI for HDTV recording schedule • Provides EPG for the coming week in form of XML

  10. Client Application • Records the HDTV program if hardware is available (not implemented) • Forms a P2P network as instructed by server. • Transfers HDTV contents

  11. BIX sharing network formation algorithm

  12. Algorithm design • Goal • Smallest total waiting time (Main Idea) • Smallest maximum waiting time • Cannot obtain both when huge number of ADSL users.

  13. Algorithm design • Sorting peers • 1st type causes of bottleneck • 3rd type is not efficient in sharing • Priority of 2nd type > 3rd type > 1st type

  14. Algorithm design • Sorting peers Variances = with pi = 1, Xi = priority, mean = 0 priority = where x = priority priority = priority * (user[uplink])1/2

  15. Algorithm design • Peers selection • Inter Peers Network Status Matrix (IPNSM)

  16. Algorithm design • Peers selection • In order of sorted list • Find the highest output node using IPNSM • Update IPNSM

  17. Algorithm design • Utilize non optimal link • Travel starts from leaf node • Connect to non optimal node in higher level

  18. Algorithm design • Inter ISP policy • Rules applied on non-reserved port • Upload bandwidth limit on fan out number • HKBN • Fan-out = 1, Output = MAX • Fan-out = 2, Output = MAX/2 • Fan-out >= 3, Output = MAX/4 • -HGC • Fan-out = 1, Output = MAX • Fan-out >= 2, Output = 310kb/s • Solution • Limit the number of connection to different ISP peer to 1

  19. Test Result • Compare with Bit Torrent (BT) • Each test is done for 5 times • Equipment: • 6PC • 2HKBN, 2HGC, 2PCCW

  20. Test Result • Case 1: Sharing 100MB video file. • Source: HKBN BB25 • Total waiting time of BIX: 9m 45s • Total waiting time of BT: 17m 54s • Maximum waiting time of BIX: 3m 52s • Maximum waiting time of BT: 6m 14s

  21. Test Result • Case 4: Sharing 2GB video file. • Source: HKBN BB25 • Total waiting time of BIX: 3h 14m 46s • Total waiting time of BT: 4h 25m 2s • Maximum waiting time of BIX: 1hr 16m 8s • Maximum waiting time of BT: 1h 25m 56s

  22. Test Result Overall result

  23. Explanation • BitTorrent has a solution for optimal path • Add information header • Huge overhead, consume processing power • Exchange groups of peers • Takes times, and may not be optimal • Inter ISP policy • Connected every peers • Fan-out to different ISP is large

  24. Conclusion • BIX has better performance than BT • Functional: • Better path • Concern of ISP policy • Non-functional: • CPU usage • Setup time

  25. Future development

  26. HDTV Content Reduction • 6GB for 1 Hour of HDTV content • Around 20% are commercials • Channel logo determines if it is a commercial

  27. HDTV Services • TiVo is a leader in TV services • Automatic recording scheduler • Real-time TV pause • Large volume hard disk for long playback • Easy to mimic • More advantage to share through internet • No legal issues ( ReplayTV )

  28. Q & A

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