On Quality of Service Optimization with Discrete QoS Options
RTAS '99 Proceedings of the Fifth IEEE Real-Time Technology and Applications Symposium
Policy-Enabled Handoffs Across Heterogeneous Wireless Networks
WMCSA '99 Proceedings of the Second IEEE Workshop on Mobile Computer Systems and Applications
Quality adaptation in a multisession multimedia system: model, algorithms, and architecture
Quality adaptation in a multisession multimedia system: model, algorithms, and architecture
Providing architectural support for building context-aware applications
Providing architectural support for building context-aware applications
IEEE Wireless Communications
Novel out-of-band signaling for seamless interworking betweem heterogeneous networks
IEEE Wireless Communications
On some principles of nomadic computing and multi-access communications
IEEE Communications Magazine
A method of ontologies merging based on rules
International Journal of Wireless and Mobile Computing
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The 4G mobile era will be based on a heterogeneous infrastructure comprising different wireless (and wired) systems in a complementary manner, where users will enjoy ubiquitous access to applications in an 'Always Best Connected' (ABC) mode that utilises the most efficient combination of systems available (e.g. UMTS and WLAN). We analyse the 'ABC' concept in an interworked UMTS/WLAN network context and reveal important issues. Next, we identify major requirements of the 'ABC' capacity, point out the limitations of UTMS/WLAN standards and discuss key enabling technologies and research efforts. We develop an application model for 'ABC' and analyse its complexity proving that, in principle, being 'ABC' translates to a family of NP-hard problems. Next, we present the design of an object-oriented UML real-time model for an 'ABC' system and provide preliminary results from simulation scenarios. In conclusion, we summarise the advantages of our 'ABC' model and provide directions for future work.