Transport Layer - Freie Universität Berlin
Transport Layer - Freie Universität Berlin
Transport Layer - Freie Universität Berlin
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TCP Congestion Control: Details<br />
● Sender limits transmission:<br />
LastByteSent - LastByteAcked � CongWin<br />
● Roughly:<br />
rate =<br />
CongWin<br />
RTT<br />
Bytes/sec<br />
● CongWin is dynamic, function of<br />
perceived network congestion<br />
● How does sender perceive<br />
congestion?<br />
Loss event = Timeout or<br />
3 duplicate acks<br />
● TCP sender reduces rate<br />
(CongWin) after loss event<br />
● Three mechanisms:<br />
● AIMD<br />
● Slow start<br />
Univ.-Prof. Dr.-Ing. Jochen H. Schiller ▪ cst.mi.fu-berlin.de ▪ Telematics ▪ Chapter 8: <strong>Transport</strong> <strong>Layer</strong><br />
● Conservative after timeout events<br />
8.96
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