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On tcp throughput and window size in a multihop wireless network testbed

By Dimitrios Koutsonikolas, Jagadeesh Dyaberi, Prashant Garimella, Sonia Fahmy and Y. Charlie Hu

Abstract

Although it is well-known that TCP throughput is suboptimal in multihop wireless networks, little performance data is available for TCP in realistic wireless environments. In this paper, we present the results of an extensive experimental study of TCP performance on a 32-node wireless mesh network testbed deployed on the Purdue University campus. Contrary to prior work which considered a single topology with equal-length links and only 1-hop neighbors within transmission range of each other, our study considers more realistic heterogeneous topologies. We vary the maximum TCP window size, in correlation with two important MAC layer parameters: the use of RTS/CTS and the MAC data rate. Based on our TCP throughput results, we give recommendations on configuring TCP and MAC parameters, which in many cases contradict previous proposals (which had themselves contradicted each other)

Topics: C.2.1 [Computer Communication Networks, Network Architecture and Design—Wireless Communication General Terms Measurement, Performance Keywords TCP throughput, TCP congestion control, 802.11 MAC, wireless mesh network, testbed
Year: 2007
OAI identifier: oai:CiteSeerX.psu:10.1.1.192.3531
Provided by: CiteSeerX
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