QoS_P2P_Streaming - Quality of Service in Peer toPeer Media...

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    Quality of Service in Peer- to-Peer Media Streaming Darshan Purandare University of Central Florida Orlando, FL, USA
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    Outline Peer-to-Peer (P2P) Media Streaming Related Work Current Issues Our Proposed Methodology Alliance Theory Important P2P Media Streaming Metrics Improving Locality of Traffic Security Issues Future Trends
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    Introduction Advent of multimedia technology and broadband surge lead to: Excessive usage of P2P application that includes: Sharing of Large Videos over the internet Video-on-Demand (VoD) applications P2P media streaming applications BitTorrent like P2P models suitable for bulk file transfer P2P file sharing has no issues like QoS: No need to playback the media in real time Downloading takes long time, many users do it overnight
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    Introduction Contd. P2P media streaming is non trivial: Need to playback the media in real time Quality of Service Procure future media stream packets Needs reliable neighbors and effective management High “churn” rate – Users join and leave in between Needs robust network topology to overcome churn Internet dynamics and congestion in the interior of the network Degrades QoS Fairness policies extremely difficult to apply like tit-for-tat High bandwidth users have no incentive to contribute
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    P2P Media Streaming Media streaming extremely expensive 1 hour of video encoded at 300Kbps = 128.7 MB Serving 1000 users would require 125.68 GB Media Server cannot serve everybody in swarm In P2P Streaming: Peers form an overlay of nodes on top of www internet Nodes in the overlay connected by direct paths (virtual or logical links), in reality, connected by many physical links in the underlying network Nodes offer their uplink bandwidth while downloading and viewing the media content Takes load off the server Scalable
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    P2P Sharing Server 1 2 5 3 4 1 3 Content Distribution Tool Content Distribution Tool File is chopped into File is chopped into pieces pieces
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    Major Approaches Major approaches Content Distribution Networks like Akamai Expensive Only large infrastructure can afford Client Server Model Not scalable Application Layer Multicast Alternate to IP Multicast Peer-to-Peer Based Most viable and simple to use and deploy No setup cost Scalable
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    Content Distribution Networks (CDNs) CDN nodes deployed in multiple locations, often over multiple backbones These nodes cooperate with each other to satisfy an end user’s request User request is sent to nearest CDN node, which has a cached copy QoS improves as end user receives best possible connection Yahoo mail uses Akamai
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    Media Streaming Tree Based Application Layer Multicast Peer-to-Peer Mesh Based [CoolStreaming, PPLive, SOPCast,TV Ants, Feidian] [NICE, ZigZag, SpreadIT] [ESM, Narada]
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This note was uploaded on 07/04/2011 for the course CIS 3360 taught by Professor Guha during the Fall '06 term at University of Central Florida.

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QoS_P2P_Streaming - Quality of Service in Peer toPeer Media...

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