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The IEEE 802.16 is the standard for broadband wireless access. One promise of this technology (also called WiMAX) is to provide high-speed access to the Internet where the transmission control protocol (TCP) is the core transport protocol. This paper studies the impact of network asymmetry in WiMAX on TCP performance. In particular, the paper investigates the dependence of the aggregate throughput and goodput of TCP on factors such as frame duration, direction of flow, DL: UL ratio, modulation and coding schemes, and offered loads. It was found that these factors affect TCP performance by exacerbating the network asymmetry inherent to the MAC layer.
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