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Accelerating Peer-to-Peer Networks for Video Streaming

Learn about Radial Reception Control Protocol (R2CP) for efficient streaming and addressing key challenges in P2P networks. Understand the architecture, packet scheduling, protocol operations, and performance evaluation. Explore related work and a critique for a comprehensive view. Discover how R2CP offers effective reliability and congestion control.

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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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