Adding Redundancy to TCP

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Adding Redundancy to TCP SCTP?

• Reiner LudwigEricsson Research, Germany

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TCP vs. RTP/DCCP
Should the IETF define this more precisely? If
yes, do we need a quota? If yes, whats the
quota? 5? If yes, the quota should also apply to
TCP
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Redundant Data in TCP A good citizen Approach
Application Layer Source Data

• Redundant Data Early Retransmitsbased on
  weaker loss indications
• Requires Detecting Respondingto Spurious
  Retransmits to StayBelow the Quota
• Allows More Flexible Handling ofDUPACK Threshold
• Allows Smaller RTOs

TCP-Friendly
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Redundant Data in TCP A Selfish Approach
Application Layer Source Data

• Retransmit for Every New ACK if No New Data is
  Available, i.e., Without any Loss
  Indication(e.g., as an option for the
  application)

TCP
TCP-Friendly
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The Questions

• The IETF Mandates Flows to be TCP-Friendly. Fine,
  but
• For a Flow that is TCP-Friendly, can the IETF
  Further Mandate what good and bad
  Packets/Bytes are?
• If yes, how? Quotas on Potentially Useless
  Packets/Bytes?