Analyse et optimisation des performances des réseaux WLAN multi-cellules / Ali Ibrahim ; sous la direction de Xavier Lagrange

Date :

Editeur / Publisher : [S.l.] : [s.n.] , 2009

Type : Livre / Book

Type : Thèse / Thesis

Langue / Language : français / French

Catalogue Worldcat

Qualité de Service (télécommunications)

Systèmes de communication sans fil

Lagrange, Xavier (19..-.... ; ingénieur) (Directeur de thèse / thesis advisor)

Ecole nationale supérieure des télécommunications de Bretagne (Brest ; 1977-2016) (Organisme de soutenance / degree-grantor)

Université de Rennes 1 (Autre partenaire associé à la thèse / thesis associated third party)

Université européenne de Bretagne (Autre partenaire associé à la thèse / thesis associated third party)

École doctorale Mathématiques, télécommunications, informatique, signal, systèmes, électronique (Rennes) (Ecole doctorale associée à la thèse / doctoral school)

Résumé / Abstract : Wireless Local Area Networks, commonly called WLAN, were originally designed as an alternative for Ethernet, the wired local area network technology. Following the impressive success of Internet in the past years, today, WLAN are mainly used as a high-speed wireless Internet access technology. A set of access points are deployed to provide coverage for a certain geographical area. We refer to these networks as multi-cell WLAN. In the research literature, WLAN were basically investigated from the local area network perspective where a set of computers share a common radio resource. In the present thesis, we consider WLAN as they are used in practice, i.e., as a multi-cell wireless access network. We propose a mathematical model to characterise the traffic capacity of multi-cell WLAN. Capacity is defined as the maximal amount of traffic the network is able to support. The model explains quantitatively the impact of inter access points interference on capacity. We use the proposed model to derive frequency and interface allocation methods as to maximize capacity. We investigate both the impact of user scheduling and access point selection and we propose additional mechanisms to improve capacity. We also propose a distributed frequency allocation algorithm and an original in-band signaling mechanism that facilitates the implementation of joint power and rate control mechanisms