caa a22 4500 44582185X CHVBK 20180317145246.0 cr unu---uuuuu 170323e20110301xx s 000 0 eng 10.1007/s00779-010-0328-2 doi (NATIONALLICENCE)springer-10.1007/s00779-010-0328-2 Mobility management in ubiquitous environments [Elektronische Daten] [Chiung-Ying Wang, Hsiao-Yun Huang, Ren-Hung Hwang] Ubiquitous computing is aiming at providing users with intelligent human-centric context-aware services at anytime anywhere. However, mobility increases dynamism and uncertainty conditions. This study therefore explores the management and uses of various contexts for automatically providing appropriate services to individual users. This issue is explored from an open framework perspective referred to as ubiquitous gate (U-gate). In this framework, a distributed context management architecture and a communication model based on standard protocols are proposed. To fit user requirements and to achieve complete mobility management, a context-aware path planning mechanism (UbiPaPaGo) and a context-aware handoff mechanism (UbiHandoff) are proposed based on context stored in an open and distributed context management server U-gate. Based on the path planning results of UbiPaPaGo, UbiHandoff derives a minimum access point (AP) handoff plan that satisfies multiple QoS requirements for individual users and services. The UbiHandoff mechanism includes multiple-attribute decision making method (MADM)-based handoff planning, referred to as MADM-based UbiHandoff, and genetic algorithm (GA)-based handoff planning, referred to as GA-based UbiHandoff. In the proposed MADM-based UbiHandoff, analytic hierarchy process (AHP) and technique for order preference by similarity to ideal solution (TOPSIS) provide efficient and seamless AP handoff to gain higher QoS performance. In GA-based UbiHandoff, genetic algorithm is employed to minimize handoff by finding appropriate APs along the path under QoS constraints. Finally, the effectiveness of the proposed mechanisms is evaluated through simulations. Numerical results demonstrate that both mechanisms minimize handoffs and ensure compliance with QoS requirements. Springer-Verlag London Limited, 2010 Ubiquitous computing nationallicence Context-aware applications nationallicence Path planning nationallicence Qos-aware handoff planning nationallicence Multiple-attribute decision making method nationallicence Wang Chiung-Ying Department of Computer Science and Information Engineering, National Chung-Cheng University, Chiayi County, Taiwan, Republic of China aut Huang Hsiao-Yun Department of Computer Science and Information Engineering, National Chung-Cheng University, Chiayi County, Taiwan, Republic of China aut Hwang Ren-Hung Department of Computer Science and Information Engineering, National Chung-Cheng University, Chiayi County, Taiwan, Republic of China aut Personal and Ubiquitous Computing Springer-Verlag 15/3(2011-03-01), 235-251 1617-4909 15:3<235 2011 15 779 https://doi.org/10.1007/s00779-010-0328-2 text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.1007/s00779-010-0328-2 text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Wang Chiung-Ying Department of Computer Science and Information Engineering, National Chung-Cheng University, Chiayi County, Taiwan, Republic of China aut NATIONALLICENCE 700 1- Huang Hsiao-Yun Department of Computer Science and Information Engineering, National Chung-Cheng University, Chiayi County, Taiwan, Republic of China aut NATIONALLICENCE 700 1- Hwang Ren-Hung Department of Computer Science and Information Engineering, National Chung-Cheng University, Chiayi County, Taiwan, Republic of China aut NATIONALLICENCE 773 0- Personal and Ubiquitous Computing Springer-Verlag 15/3(2011-03-01), 235-251 1617-4909 15:3<235 2011 15 779 Metadata rights reserved Springer special CC-BY-NC licence nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-springer