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Accelerating Peer-to-Peer Networks for Video Streaming

Accelerating Peer-to-Peer Networks for Video Streaming. Group 2 Andrew Doherty Aaron Wroblewski Raghav Chawla. Introduction. Radial Reception Control Protocol (R 2 CP) enables real-time streaming of multimedia files over P2P networks

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Accelerating Peer-to-Peer Networks for Video Streaming

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  1. Accelerating Peer-to-Peer Networks for Video Streaming Group 2 Andrew Doherty Aaron Wroblewski Raghav Chawla

  2. Introduction • Radial Reception Control Protocol (R2CP) enables real-time streaming of multimedia files over P2P networks • R2CP uses RCP, which is similar to TCP but streamlined for P2P real-time usage • New method of scheduling using rankings

  3. Background and Motivation • Peer-to-peer (P2P) overlay networks growing in popularity • Widely used for file transfers, but not real-time streaming • Most popular types of shared files are multimedia (music and video)

  4. Traditional Download Model Streaming Model (Peer to Peer) 1.38 Mbps Server 352x240 VCD ≥ 1.5 Mbps 256 Kbps 1.5 Mbps 1.5 Mbps Home PC 83 Minutes To Start Watching!! Need 6 times available Bandwidth! The Problem Statement

  5. Challenges • Bandwidth Requirements • Ensuring In-Order Packet Arrival • Peer Diversity • Bottleneck Bandwidth • Latency • Peer Transience • Users have short sessions in P2P • Random Disconnects

  6. R2CP Architecture • RCP • Individual Paths • TCP Clone • Receiver Driven • R2CP Engine • Aggregate Connection • Coordinates RCP • Packet Scheduling

  7. Dynamic Binding • Sequence Numbers • Local -> Global • Loss Recovery • Coordinate losses with deadlines • Pipe Management • Reassign data from closed pipes to other pipes

  8. Packet Scheduling • Goals • Ensure In-Sequence Delivery • Minimize Packet Loss due to • Buffer Overflows • Missing Deadlines • Methodology • Congestion Control • Rank Data Structure

  9. Packet Scheduling • Congestion Control • RCP Notifies R2CP Engine when is has available slots in congestion window • R2CP sends a data echo request to the source • Ranking Data-Structure • R2CP ranks each request by an approximated arrival time • Request order is determined by rank and last packet requested

  10. Protocol Operations • R2CP Manages • RCP pipes • Sequence numbers • Transmission/Receipt • RCP Pipes Handle • Congestion Windows • Loss Notification • RCP Sender • Echos Data

  11. Performance Evaluation Model • Varied Network Conditions • Compared performance of R2CP to: • Ideal Conditions • Multiple Sockets • R2CP without RTT-scheduling

  12. Results - Scalability Rate Differential Delay Differential Traffic Fluctuations

  13. Results – Multipoint-to-Point Video Streaming Instantaneous Data Rate Playout Buffer Occupancy Resequencing Buffer Occupancy

  14. Related Work • “On multiple description streaming with content delivery networks,” in Proceedings of IEEE INFOCOM, June 2002 • Proposes approach that uses multiple description coding for video streaming over multiple servers • However P2P network users are not static so this doesn’t apply • “Distributed video streaming over Internet,” in Proceedings of SPIE Multimedia Computing and Networking, Jan. 2002 • Stream video from multiple distributed video servers • Requires synchronization between servers • “PROMISE: Peer-to-peer media streaming using CollectCast,” in Proceedings of ACM Multimedia, Nov. 2003 • P2P streaming using multiple sources using UDP connection for streaming with TCP connection for sending control info • Requires lower layer service and use of separate TCP connections for updates adds additional overhead

  15. Critique • Specific operation of the ranking/scheduling algorithm difficult to understand • Examples would have been helpful • Larger scope simulation with more sources with less ideal conditions

  16. Summary and Conclusions • R2CP is a viable method to enable real-time multimedia streaming over P2P networks • R2CP is receiver-driven, requiring little overhead from multiple sources • R2CP implements effective reliability and congestion control

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