Invitation à la soutenance de thèse de Phu Hung LE

Bonjour,

J'ai le plaisir de vous inviter à ma soutenance de thèse intitulée
"Protocole de Routage Multi-chemin pour des Réseaux Ad Hoc".

Elle aura lieu au Laboratoire d'Informatique de Paris 6 (LIP6) à Jussieu
(http://www.lip6.fr/informations/comment.php), le vendredi 28 Septembre 2012,
à 14h30, dans la salle 101, couloir 25-26, 1er étage et vous êtes
également chaleureusement conviés au pot qui suivra dans la salle 101,
couloir 26-00 du même étage.

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Jury
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Le jury sera composé de:

Rapporteurs :
M.André-Luc BEYLOT, Professeur, IRIT/ENSEEIHT, Toulouse, France.
M.Steven MARTIN, HDR à l'Université Paris-Sud, France.

Examinateurs :
Mme.Dominique GAIT, Professeur, Université de Technologie,
Troyes, France.
Mme.Thi Mai Trang NGUYEN, HDR à UPMC, Paris, France.

Directeur :
M.Guy PUJOLLE, Professeur, UPMC Sorbonne Universités.




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Abstract
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Mobile ad hoc networks (MANETs) consist of a collection of wireless
mobile nodes that move freely and self-configure without a preexisting
communication infrastructure.

In MANETs, under the arbitrary movement of nodes and highly dynamic
topology conditions, the routing protocols for fixed networks do not
perform well. To adapt to the rapid change of topology, many routing
protocols have been proposed. However, most of them chose the minimum
hop-count routes. This choice can lead to significant reduction of the
network performance because communication quality via the chosen links
is not good. Thus, the evaluation of link quality is indispensable and
interference is a key factor to be considered. In the literature,
most of the existing interference-aware protocols are single path and
the consideration for interference range is limited. Several proposed
interference-aware multi-path protocols for MANETs are either not
highly efficient or have the computational complexity of NP-hard.

To tackle the above problems, we first determine an interference
region of each link including all nodes that can interfere with this
link. Then, we propose a formula to evaluate the interference level of
each link. Based on the formula of the link interference, we develop a
series of interference-aware multi-path routing protocols for mobile
ad hoc networks. These interference-aware multi-path routing protocols
minimize the impact of interference on the paths from the source to
the destination to increase the network performance. The computational
complexity of the protocols is polynomial and each of them is most
suitable for a type of network size.

To demonstrate the efficiency of the interference-aware multi-path
routing protocols, we compare them to prominent protocols in different
network sizes and a high mobility environment when the RTS/CTS
(Request-To-Send/Clear-To-Send) mechanism is alternatively turned on
and turned off. The simulation results show that our protocols
significantly improve packet delivery fraction, and reduce end-to-end
delay, routing overhead, and normalized routing load.

The RTS/CTS mechanism is to restrict the collision caused by the
hidden terminals. However, we show that the RTS/CTS mechanism is not
suitable for mobile ad hoc network based on the simulation results.



Cordialement,
Phu Hung LE