MIH-based Multilayer Cooperation Vertical Handover in Wireless Heterogeneous Converged Network
|School||Nanjing University of Posts and Telecommunications|
|Course||Communication and Information System|
|Keywords||heterogeneous wireless network network convergence multilayer collaboration verticalhandover|
Wireless mobile communication technologies have got rapid development in the last decade.More different types of wireless systems have been created which vary in pattern, performance andcoverage. With the wireless network environment becoming more complex, single accesstechnology is unable to meet the users’ demand. So the convergence of heterogeneous networks istaken more serious. In order to provide the service continuity across heterogeneous networks, it isnecessary to optimize the traditional vertical handoff scheme to minimize the delay which leads tothe decline of user perceived QoS.This paper starts from the analysis of the entire process of vertical handover in heterogeneousnetworks and then explores every key point which can be optimized. In order to increase theautonomy and flexibility of the user to select access networks, the user-centric CBM network modelinstead of the traditional operators-centric SBM model is used. The protocol stack designed forwired network will decrease the quality of service perceived by the user when used inheterogeneous vertical handover. So a multilayer collaboration vertical handover model is presented.Taking account of the advantages of MIH protocol in heterogeneous vertical handover, the MIHfunction layer will be added into the multi-layered collaboration model as an important layer of theprotocol stack. In handover execution stage, the current scheme focuses on single-level optimization,such as using optimized FMIPv6protocol instead of MIPv6protocol in network layer. The effect isnot obvious, because vertical handover involves several layers of the protocol stack. So a multilayercooperation handover scenario is put forward based on the previous multilayer collaboration model.Finally, the correctness and validity of the model is verified by NS2simulation.