Tesis y Tesistas 2020 - Postgrado - Fac. de Informática - UNLP

english
Mg. Diego Rodriguez Heirlen
Thesis contributions
The contribution of this this thesis is oriented towards
the TCP performance analysis, in particular, when used on
paths with wireless access links. The first chapters are a
revision of the “state of the art” in this knowledge area,
compiling and sorting out deficiencies manifested by the
protocol on WLAN, as well as its subsequent modifications,
which gave origin to the known variants aiming towards
improving performance. Among these, this work is only
focused on the ones that contemplate End-to-End schemes
and don’t rely on any kind of explicit information given
by the network. A significant amount of simulations is
presented as well; the performance degradation of different
TCP variants is exposed along with proposed solutions to
improve it on a heterogeneous model. Throughout the state
of the art evaluations, on can see that the biggest part of such
investigation was made on heterogeneous models, where only
wireless links were included. One of the original contributions
of this paper is that the models used attempt to represent
real networks in which connections may have multiple types
of links in their path, since in general, every connection ends
up on a server connected through a wired link.
At last, the problem of contest among multiple simultaneous
TCP flows and the way in which bandwidth is distributed,
analyzed under the fairness approach, is addressed.
Future Research Lines
In regards to future lines of work, one could contrast these
tests against the ones executed on a real world scenario
and compare the results. Also, there should be a bigger
complexity required for the studied models: increasing
the amount of nodes and competing simultaneous flows;
introducing node mobility and links with different kinds
of technologies representing more precisely Internet’s
heterogeneity; extend the analysis to other transport layer
protocols proposed to solve performance problems on
wireless networks.
103 TESIS Y TESISTAS 2020