Vertical handoffs in wireless overlay networks
Mobile Networks and Applications - Special issue: mobile networking in the Internet
A Middleware Infrastructure for Active Spaces
IEEE Pervasive Computing
Aura: an Architectural Framework for User Mobility in Ubiquitous Computing Environments
WICSA 3 Proceedings of the IFIP 17th World Computer Congress - TC2 Stream / 3rd IEEE/IFIP Conference on Software Architecture: System Design, Development and Maintenance
LIME: A Middleware for Physical and Logical Mobility
ICDCS '01 Proceedings of the The 21st International Conference on Distributed Computing Systems
ICESS '05 Proceedings of the Second International Conference on Embedded Software and Systems
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When a ubiquitous computing environment is based on seamless connectivity, intelligent network management among heterogeneous network interfaces, called vertical handoff (VHO), is required. However, conventional VHO schemes are based only on network information, and do not address service management for seamless service execution. This paper thus proposes a middleware architecture supporting efficient seamless connectivity with service management. In this architecture, we define core modules to perform VHOs in accordance with the context of services and user intention, in addition to network information. We also define profiles that express the contexts associated with the VHO process and service management. With the proposed scheme, we show that the number of unnecessary VHOs and application failures is significantly reduced, leading to an enhancement of around 34% in data throughput. The approach also reduces application failures by 50% and the number of VHOs by 32%.