A framework for fast handoff schemes in wireless ATM networks

Includes bibliographical references.In this research, we focus on providing a framework that extends the fixed ATM standard to support user mobility in future WATM networks. The WATM architecture allows for the migration of fixed ATM networks without major modifications. Thus most of the mobility functions are implemented on the wireless access network. The most important component supporting mobility in a cluster is the Mobility Enhanced Switch (MES). We propose using direct links between adjacent MESs to support Permanent Virtual Channels (PVCs) in order to facilitate fast inter-cluster handoffwith minimum handofflatency. This research addresses a framework on handoff mobility by proposing three fast handoff re-routing schemes based on the support of PVCs

On the Evaluation of Handover Exchange Schemes Between Two Cognitive Radio Base Stations with and without Buffers

This article investigates and evaluates a handoverexchange scheme between two secondary users (SUs) moving indifferent directions across the handover region of neighboring cellin a cognitive radio network. More specifically, this investigationcompares the performance of SUs in a cellular cognitive radionetwork with and without channel exchange scheme. The investigationshows reduced handover failure, blocking, forced andaccess probabilities respectively, for handover exchange schemewith buffer as compared to exchange scheme without buffer.It also shows transaction within two cognitive nodes within anetwork region. The system setup is evaluated through systemsimulation