Mémoires de Fin d’Etudes
Etablissement
Université 8 mai 1945 de Guelma
Affiliation
Département d’Informatique
Auteur
MAHFOUF, ZOHRA
Directeur de thèse
Pr. Hamid Seridi (Professeur)
Filière
Informatique
Diplôme
Magister
Titre
Adaptation d’un Protocole Filaire aux Réseaux Sans Fils
Mots clés
Ad hoc networks; Wireless networks; MAC; Medium Access Control; Quality of Service (QoS);clustering, diffserv, 802.11e.
Résumé
DCC-MAC (Distributed Clustering and Communication MAC protocol) Many technological factors, such as cheaper hardware, smaller transceivers, and faster processors, are fueling the increased interest in wireless ad hoc networks. The main goal of wireless ad hoc networks is to allow a group of communication nodes to set up and maintain a network among themselves, without the support of a base station or a central controller. From the applications perspective, wireless ad hoc networks are useful for situations that require quick or infrastructureless local network deployment, such as crisis response, conference meetings, sensor networks, military applications, and possibly home and office networks. Ad hoc networks could, for instance, empower medical personnel and civil servants to better coordinate their efforts during large-scale emergencies that bring infrastructure networks down, such as flood, earthquake… In the OSI reference model, medium access is a function of the layer 2 sublayer called the Medium Access Control (MAC) layer. MAC protocols for wireless networks must address the hidden node problem and must exercise power control. Accessing the wireless medium thus requires a more elaborate mechanism than what is required by wired networks to regulate user access to the channel. Ad hoc wireless networks present even greater challenges than infrastructure wireless networks at the MAC layer. The absence of a centralized controller creates the need for distributed management protocols at the MAC layer, and possibly at higher layers of the network stack. In this thesis we present specific issue of ad hoc wireless networks than we conduct a study of some existing MAC protocols for wireless ad hoc networks, We than propose a novel distributed MAC protocol with quality of service support for a cluster based topology. Our protocol enclose five phases, clustering (using our loosely centralised Algorithm to avoid exposed and hidden node problems), intra-node traffic category election using service differentiation mechanism, candidature phase to exchange nodes need, inter-nodes distributed selection of the current high priority node and finally data transmission of the designed node
Date de soutenance
2010
Cote
004
Pagination
98 PAGES
Illusatration
relieure
Format
PDF
Statut
Traitée