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Jungsik Yoon Networked Media Lab Department of Information and Communication Gwangju Institute of Science and Technology (GIST) 2009.

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Presentation on theme: "Jungsik Yoon Networked Media Lab Department of Information and Communication Gwangju Institute of Science and Technology (GIST) 2009."— Presentation transcript:

1 Jungsik Yoon Networked Media Lab Department of Information and Communication Gwangju Institute of Science and Technology (GIST)

2  MS. 3 rd semester  Research area ◦ Segment Scheduling for P2P-based wireless VoD service  Project ◦ MOVi-TV (Sep./2008~Jun./2010)  Segment scheduling  Openmoko (porting on handheld device)  Publications ◦ 1 domestic paper A priority-based segment scheduling in peer-to-peer-based wireless VoD, KSPC 2008  Graduation ◦ / (if postponed) ◦ Adaptation of FEC to MOVi and Enhance Segment Scheduler

3  Segment scheduling for MOVi DS Mobile Networks Downlink P2P link  Goal Provide more many users with good playback quality  Scheduling  Sender/receiver  Segment  Time  Frequency

4  Adaptation of FEC (Forward Error Correction) ◦ Transmit unit is a block, a fragmentation of segment (does not use encoding/decoding) ◦ In wireless network, packet loss rate is quiet high ◦ In order to transmit reliably, adapt FEC algorithm for MOVi ◦ Two candidates  Network Coding  Digital Fountain Approach ◦ Select one idea from survey and simple simulation ◦ Result should be implementation in Testbed  Group-based segment scheduling ◦ When P2P-connection > Downlink, average performance and scalability of MOVi is increased ◦ To increase P2P-connection, make a group of nodes then one node can transmit using localized broadcast ◦ This idea also need packet encoding/decoding

5  Expected Output ◦ FEC adapted MOVi system (Implementation) ◦ Group-based segment scheduler (Simulation  Implementation) ◦ Paper work (if possible)  Plan


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