ࡱ> +-*JbjbjUU >??J   MMMMMaaaa m a yyyyyyyy6ZMyyyyyMMyyyyyyMyMyyyyyyy{|}ayy0 yyyMy yyyyyyyyyyyy yyyyyyyyyyyyy  :ABSTRACT Ambient Assisted Living (AAL) systems comprise a set of ubiquitous technologies (AAL Services) embedded in a living space (AAL Space), which is aimed towards extending the time that elderly and disabled people can stay independently in whichever place they prefer, such as their homes, gym and office. Usually, AAL approaches focus on covering only the home environment, since their own house is the place where elderly people prefer to stay most of time. Hence, AAL Services for assisting and monitoring home dwellers are not commonly tailored to extrapolate the boundaries of the house, being generally provided only inside those well-delimited areas. However, AAL is not just about home-based health care, it also aims at increasing the quality of life, autonomy, independence, participation in social life, skills and employability of elderly and disabled people. Thus, some AAL systems might take advantage from a level of continuity. When users leave their houses, they would be benefited from some services commonly provided by AAL environments, if such services were also made available beyond the house's boundaries. Expanding the coverage of AAL imposes significant challenges to AAL platforms, particularly in the case of the migration of the user through different environments covered by AAL services. In mobile computing, several approaches propose methods to allow a mobile node to move efficiently and seamlessly through areas covered by diverse networks, while preserving connection and service coverage. Handover is the general term for this operation. By analogy, we formulate the problem we approach in this work as ensuring the handover of AAL services, in order to allow users to move freely through diverse AAL spaces, while providing and maintaining a continuous service. In order to accomplish this, we propose a flexible framework for supporting service handover in the design of AAL Services. We assume that there are two handover patterns: direct handover, when the user migrates between AAL Spaces whose service coverage areas have some intersection; and indirect handover, when the user migrates between AAL Spaces with no intersection between their coverage areas. Our proposed framework takes in consideration each of these different handover patterns. Furthermore, in the case of indirect handover, we propose the use of smart phones to act as a mobile version of an AAL Space. We also specify the architectural components necessary for deploying handover support in AAL Platforms. Based on that, we describe our framework to develop AAL Services with handover support, implementing the proposed architectural components. Finally, to show the feasibility of our approach, we designed, implemented and evaluated a prototype based on the concepts of our flexible framework. 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