TCP congestion control:

• two “phases”

  • slow start
  • congestion avoidance

• important variables:

  • Congwin
  • threshold: defines threshold between two slow start phase, congestion control phase

• “probing” for usable bandwidth:

  • ideally: transmit as fast as possible (Congwin as large as possible) without loss
  • increase Congwin until loss (congestion)
  • loss: decrease Congwin, then begin probing (increasing) again

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