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Accueil > Équipes > METHODES > Séminaires Méthodes > Séminaires METHODES > Séminaires 2011 METHODES

"Some problems in the sparse and dense MANETs"

par Lucile Sassatelli, de l’Universite de Nice Sophia Antipolis

Nous aurons le plaisir d’accueillir Lucile Sassatelli,
de l’Universite de Nice Sophia Antipolis

jeudi 28 Avril 2011 a 14h, en C06

Title : Some problems in the sparse and dense MANETs

Abstract :

Mobile Ad Hoc Networks (MANETs) will be a necessary part of next
generation wireless systems. Their specificity is to allow communication
between mobile users, even in the absence of infrastructure.

MANETs can
be partitioned in two categories : sparse and dense networks, or
equivalently, connectivity-limited and interference-limited networks. To
deal with such problems of lack of connectivity or interference, MANETs
can leverage the mobility of relay nodes to achieve end-to-end

In both categories of MANETs, a variety of problems arise
from the absence of infrastructure : how to perform routing, how to
perform scheduling, how to minimize the delivery delay under some energy
constraint, what mobility model best describe the targeted network of
application, how to deal with privacy, what is the highest per-session
throughput one can expect, etc.

The first part of the talk addresses the case of sparse MANETs. We study
replication mechanisms that include block codes as well as rateless
random linear coding in order to improve the probability of successful
delivery within a given time limit.

In particular, we study the effect
of coding on the performance of the network while optimizing parameters
that govern routing.

In the other hand, security is a major performance bottleneck in MANET
deployment. The broadcast nature of wireless links makes interception of
transmission extremely easy and the lack of centralized infrastructure
hinders implementation of admission control policies or distribution of
secret keys.

In such a scenario, it is important to exploit security
opportunities at all levels of the system, and specifically at the

That is why in the second part of the talk, we will look
at dense MANETs, in which we want to determine the best performance, in
terms of per-session secrecy capacity-delay tradeoff and level of
privacy, in the presence of eavesdropping nodes.

I will conclude the talk by presenting some ongoing research on routing
policies for heterogeneous mobility models, and network coding
performance in heterogeneous networks.

Contact : Tijani Chahed