TY - GEN A1 - Kirsche, Michael A1 - Dreissig, Matthias A1 - Kopsch, Ralf A1 - Gäbler, Jan A1 - Klauck, Ronny A1 - Pink, Mario A1 - Liu, Fuwen A1 - König, Hartmut T1 - uBeeMe - Eine Plattform zur Unterstützung mobiler kollaborativer Anwendungen T2 - Praxis der Informationsverarbeitung und Kommunikation : (PIK) Y1 - 2011 U6 - https://doi.org/10.1515/PIKO.2011.003 SN - 0930-5157 VL - 34 IS - 1 SP - 11 EP - 22 ER - TY - CHAP A1 - Pink, Mario A1 - Pietsch, Thomas A1 - König, Hartmut T1 - Towards a seamless mobility solution for the real world: Handover decision T2 - Hand-over decision, International Symposium on Wireless Communication Systems 2012, August 2012, Paris, France N2 - The increasing use of wireless networks has raised the desire to have not only a stable and good quality access to the network, but also to seamlessly change the network when moving. Various handover algorithms have been proposed to handle this situation. Unfortunately, many of these handover algorithms have only been evaluated by simulations. They do not take the wide range of mobile devices with varying system parameters into account. For the practical deployment, handover algorithms are required that adapt to various device parameters and network characteristics. In this paper we present a fuzzy-based vertical handover decision algorithm which adjusts itself to the given device and network capabilities. Starting with a discussion of handover requirements we present the algorithm and describe how it is activated in the handover process. Finally we present several experiments which evaluate the accuracy of the handover decision, the quality of service guarantees for the application, and the resource consumption. Y1 - 2012 SN - 978-1-4673-0761-1 U6 - https://doi.org/10.1109/ISWCS.2012.6328448 SP - 651 EP - 655 PB - IEEE ER - TY - CHAP A1 - Pink, Mario A1 - Pietsch, Thomas A1 - König, Hartmut T1 - An adaptive Handover decision algorithm for heterogeneous wireless networks T2 - Mobile Wireless Middleware, Operating Systems, and Applications, 5th International Conference, Mobilware 2012, Berlin, Germany, November 13-14, 2012 Y1 - 2012 SN - 978-3-642-36659-8 SP - 136 EP - 149 PB - Springer CY - Berlin ER - TY - GEN A1 - König, Hartmut A1 - Gäbler, Jan A1 - Klauck, Ronny A1 - Pink, Mario A1 - Sprejz, Michael T1 - uBeeMe - A Platform for Mobile Collaborative Applications T2 - PIK - Praxis der Informationsverarbeitung und Kommunikation Y1 - 2013 U6 - https://doi.org/10.1515/pik-2012-0058 SN - 0930-5157 VL - 36 IS - 1 SP - S. 43 ER - TY - CHAP A1 - Pink, Mario A1 - Sprejz, Michael A1 - König, Hartmut T1 - A Coordinated Group Decision for Vertical Handovers in Heterogeneous Wireless Networks T2 - 2013 International Conference on MOBILe Wireless MiddleWARE, Operating Systems, and Applications, Bologna, Italy, November 11-13, 2013 N2 - Cooperation and interactions of mobile users is a characteristic feature of mobile collaborative applications. The users are located in different mobile communication networks or move in or among them, respectively. This requires horizontal and vertical handovers. The latter is required when the networks use different network technologies. Usually each mobile device independently chooses the most appropriate network for its purposes to switch to. In group-oriented applications this may lead to an uncoordinated network selection and as consequence to increased energy consumption. In this paper, we present a distributed vertical handover decision algorithm that coordinates the selection of the network among the mobile devices in order to ensure an optimal quality of service for the collaborative application and a low energy consumption of the involved mobile devices. The network selection is based on the calculation of a group benefit for each alternative network using the Simple Additive Weighting (SAW) algorithm. The feasibility of the algorithm is evaluated regarding varying group sizes and resource requirements. Y1 - 2013 U6 - https://doi.org/10.1109/Mobilware.2013.20 SP - 130 EP - 137 PB - IEEE CY - Piscataway, NJ ER - TY - CHAP A1 - Gäbler, Jan A1 - Klauck, Ronny A1 - Pink, Mario A1 - König, Hartmut T1 - uBeeMe - a Platform to Enable Mobile Collaborative Applications T2 - Proceedings of the 9th International Conference on Collaborative Computing: Networking, Applications and Worksharing (CollaborateCom 2013), Austin, Texas, USA, October, 2013 Y1 - 2013 SP - 188 EP - 196 PB - IEEE CY - Piscataway, NJ ER -