Enhanced IEEE 802.21 Handover Design for QoS Support in Next Generation Wireless Networks

Next Generation Wireless Networks (NGWNs) present the fast evolution of telecommunications systems, which aim at achieving a total convergence between various existing technologies, and offering the seamless mobility inter-technologies and inter-operators to the users without degrading the provided Quality of Service (QoS). In order to grant QoS in the converged all-IP network, user mobility and Call Admission Control (CAC) process should be pre-managed. Many researchers have worked on improving the effectiveness of NGWNs in terms of optimizing mobility management process, Radio Resources Management (RRM), security, etc. In this article, we deal with the CAC challenge in the heterogeneous networks. In fact, we propose a Media Independent Handover (MIH) based approach for vertical handover mechanism reached by performing QoS negotiation along with resource reservation and adaptive CAC scheme which ensures the QoS agreements. The performance results of the proposed schemes are compared with another competing approach using simulation analysis. Simulation results show the major impact on the performance of the deployment of MIH standard, which is reflected in increased resource utilization ratio that can reach 95% for 3000 mobile users and in the ability in satisfying the requirements of QoS in terms of call blocking probability rate (less than 6% for the real time application) and the packet loss ratio (less than 10% for real time application).