Given that a TCP connection is inversely proportional to its RTT. Connections wi

Question

Given that a TCP connection is inversely proportional to its RTT. Connections with heterogeneous RTTs sharing the same queue will get different bandwidth shares . What will be the eventual proportion of the bandwidth sharing among three connections if their propagation delays are 10ms , 100ms and 150ms , and the service rate of the shared queue is 200Kbps ? Assume that the queue size is infinite without buffer overflow (no packet loss) , and the maximum window of the TCP sender is 20 packets, with each packet having 1500 bytes.

Explanation / Answer

Consider, steady state data transfer , sliding window flow control turns into rate based flow control , with sender i dropping a packet into the network every 2i msec , i the propagation delay for sender i.

With = 150 msec, a sender transmits a packet every 300 msec; the sender transmits two packets every 600 msec. A sender with = 100 transmits three packets every 600 msec. A sender with = 10 msec transmits 30 packets every 600 msec.

Of the 35 packets entering the router queue every 600 msec, 86% (30 of 35) belong to the fast sender, 6% (2 of 35) belong to the slow sender, and 8% (3 of 35) belong to the third sender.

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