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Title of Journal: Wireless Pers Commun

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Abbravation: Wireless Personal Communications

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Springer US

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DOI

10.1007/bf02840385

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1572-834X

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Performance Enhancement of TCP in Dynamic Bandwidt

Authors: NengChung Wang JongShin Chen YungFa Huang ChiLun Chiou
Publish Date: 2008/03/27
Volume: 47, Issue: 3, Pages: 399-415
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Abstract

In this paper we propose a scheme that dynamically adjusts the slow start threshold ssthresh of TCP The ssthresh estimation is used to set an appropriate ssthresh A good ssthresh would improve the transmission performance of TCP For the congestion avoidance state we present a mechanism that probes the available bandwidth We adjust the congestion window size cwnd appropriately by observing the round trip time RTT and reset the ssthresh after quick retransmission or timeout using the ssthresh estimation Then the TCP sender can enhance its performance by using the ssthresh estimation and the observed RTT Our scheme defines what is considered an efficient transmission rate It achieves better utilization than other TCP versions Simulation results show that our scheme effectively improves TCP performance For example when the average bottleneck bandwidth is close to 30 of the whole network bandwidth our scheme improves TCP performance by at least 10

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