Adaptive FEC and ARQ Control

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Adaptive FEC and ARQ Control
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Overview

• Adaptive FEC and ARQ Control for Reliable
  High-Speed UDP-based Media Transport

Server
Client
Control Module
Adaptive FEC
Adaptive FEC
Time constrained ARQ
Time constrained ARQ
Hybrid ARQ
Hybrid ARQ
Feedback Monitoring Module
Feed back (Loss)
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Background Motivation

• Background
• Reliable and real-time transport service for
  massive continuous media over high-speed network
• Adaptive FEC
• Control the amount of redundancy to adapt network
  fluctuation
• Time-constrained ARQ
• Retransmission based error recovery scheme
• Hybrid ARQ
• FEC and Retransmission
• Motivation
• To guarantee reliability while satisfying given
  delay constraint
• To catch up with occasional burst packet losses
  in high-speed network

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Main Technical Component

• Time constrained ARQ Module
• ACK Vector(DCCP), Loss List(SABUL)
• How to exactly estimate retransmission time
• Control Module
• Decide which scheme is adopted
• How fast scheme can be changed
• Feed back and Monitoring Module
• How often send feedback packet

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Contributions Related works

• Contributions
• Adaptive Transport module controls the protection
  method by selectively switching between adaptive
  FEC and delay-constrained ARQ modes
• Adaptive Transport module attempts to balance
  reliability and real-time support
• Related works
• FEC
• FLUTE File delivery, non real time
• ARQ
• TSUNAMI, SABUL Complete reliability, non real
  time

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Results

• Current Result
• Stabilized adaptive FEC module
• Less packet loss
• Expected Result
• Time constrained ARQ
• Future work
• Hybrid ARQ
• Full Adaptive Transport module