TCP over WiMAX: A Measurement Study

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TCP over WiMAX: A Measurement Study
We present active measurement results from a commercial IEEE 802.16/WiMAX-based network, with primary focus on TCP performance. We compare four TCP variants, namely New Reno, Cubic, Vegas and Veno, using throughput, round-trip time (RTT), and retransmission rate metrics. While all TCP variants achieve similar throughput, they do so in different ways, with different impacts on the network performance. We identify adverse effects of TCP window auto-tuning in this environment and demonstrate that congestion losses dominate random wireless errors on the physical link. We reveal several issues for this WiMAX-based network, including limited bandwidth for TCP, high RTT and jitter, and unfairness during bidirectional transfers. Such a network environment may be challenging for many wireless Internet applications, such as remote login, VoIP and video streaming. Keywords Measurement, Performance, 802.16, WiMAX, TCP
Emir Halepovic, Qian Wu, Carey L. Williamson, Maji
Added 29 Oct 2010
Updated 29 Oct 2010
Type Conference
Year 2008
Authors Emir Halepovic, Qian Wu, Carey L. Williamson, Majid Ghaderi
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