Integration et gestion de mobilite de bout en bout dans les reseaux mobiles de prochaine generation

During the last few years, the use of wireless systems is becoming more and more popular. This tendency can be explained by the fact that mobile technologies are gaining in performance in terms of bandwidth, coverage and cost compared to the traditional wired solutions. However, each mobile network is tailored for a specific type of services and users. Moreover, end users are expected to become more and more mobile and show an increasing interest to real-time applications. In these circumstances, the next generation of mobile networks (4G) appears to be the ultimate solution that will satisfy mobile user demands and take benefit of the existing wireless systems. Indeed, the future generation consists of integrating, in an intelligent manner, the existing/future wireless systems in a way that users can obtain their services via the best available network.;Based on these facts, the main concern of this thesis is to propose new solutions that address some well known problems pertaining to the conception and deployment of the next generation of mobile networks. More specifically, this work starts with a deep analysis of the existing solutions in order to identify new hints for our research. Then, we present three articles which refer to the main themes concerned by this thesis. Particularly, the first article proposes an efficient end-to-end mobility management scheme called: Adaptive end-to-end mobility scheme for seamless horizontal and vertical handoffs. The proposed protocol ensures seamless handovers and improves the throughput during the handoff period.;The second article introduces a new Handoff Decision Strategy designated as HDS. This strategy is based on the Fuzzy logic and includes an efficient context analysis scheme that guarantees the availability and the privacy of context parameters through heterogeneous mobile systems. Furthermore, HDS implements a handoff initiation process that allows a mobile user to decide which type of handoff to trigger (i.e., forced or voluntary) and under which conditions. In addition, HDS incorporates a powerful network selection mechanism that allows a mobile node to be always connected to the best available network when it performs either inter-system or intra-system handoffs.;Finally, the third article proposes a new Hybrid Interworking Architecture for metropolitan networks (HIA). The main objective of HIA consists of integrating any type of existing/future mobile systems while hiding their heterogeneity from each other. Additionally, HIA guarantees inter-system authentication and billing by using an independent authority referred to as Interworking Cooperation Server (ICS). Furthermore, to ensure seamless global roaming, HIA is coupled with an efficient transport layer mobility scheme that uses underlying hints to prepare appropriate handoffs. Performance analysis show that the proposed architecture respects well the 4G requirements in terms of cost, deployment and global roaming compared to the existing solutions. As a conclusion, the main contributions of this thesis consist of: (1) proposing an end-to-end mobility scheme that takes into account micro and macro mobility at the transport level. This proposal aims to reduce handoff delay, packet loss, and signaling load. Moreover, it addresses the problem of deterioration of throughput due to spurious retransmission during handoff periods. (2) introducing a handoff decision strategy which uses Fuzzy Logic to prepare and initiate appropriate handoffs. Furthermore, this strategy integrates an efficient context-aware architecture that guarantees context information privacy through heterogeneous mobile systems. (3) developing a new preference function that considers a wide range of context parameters and takes into account network stability. (4) conceiving an interworking architecture that integrates metropolitan networks with respect to 4G requirements in terms of mobility and service continuity. (5) proposing an enhanced Hierarchical Transport layer Mobility (HTM) scheme that guarantees QoS requirements by incorporating handoff preparation and network selection into the handoff process. (6) evaluating the effectiveness of the proposed solutions through simulations and theoretical models.;This integration passes through the use of the Internet Protocol ( IP) that will hide the heterogeneity pertaining to the integrated networks. To deal with this very important task, several solutions are available in the literature. The proposed approaches cover some basic topics such as interworking architecture and mobility management. Nevertheless, these proposals suffer from drawbacks relevant to the guarantee of QoS through heterogeneous technologies.