Experimental Evaluation of TCP Performance over WiMax Networks (pp. 275-292)
Authors: (Emmanuele Bello, Augusto Ciuffoletti, Dept. of Computer Science, University of Pisa, Italy)
Abstract: WiMAX is a wireless networking technology that promises to bring Internet con
nectivity in regions unreachable by copper based links. In this paper we investigate the
performance of TCP congestion control algorithms in order to fully utilize the band
width available on a WiMAX link, and to fairly share it between several applications
running on the attached host.
To gather evidence of the performance of the ten congestion control algorithms that
we selected among the many based on their practical utilization, we implemented a
real network where the bottleneck was the WiMAX link, and we submitted a reference
traffic load to all protocols. The traffic load consisted of one or two continuous streams
The experimental results are analyzed in a black box fashion, without reference
to the internals of each algorithm: it turns out that the Westwood algorithm performs
better than the others, shortly followed by Hybla. The panel of considered algorithms
encompasses the ``plain old Reno'', as well as CUBIC, currently the standard in Linux
kernels (from release 2.6.19), and others.