Maintien de la connectivité dans les réseaux Ad hoc sans fil

Abstract

The lifetime in a wireless network, in particular a wireless sensors network depends strongly on the factor connectivity between its nodes. Several factors can be at the origin of a connectivity rupture such as: lack of energy on a significant node level, infection of a vital node by a malevolent code, a logical or physical failure of a primary node, etc. This rupture can lead in some cases to a reconfiguration of the network by generating a prejudicial overhead or in other cases to a failure of the mission assigned to the network. In this thesis, we propose three approaches relating to the connectivity maintenance to prolong the lifetime of the wireless sensor networks.