In the next decades, the growth in population aging will cause important problems to most industrialized countries. To tackle this issue, Ambient Assistive Living (AAL) systems can reinforce the well-being of elderly people, by providing emergency, autonomy enhancement, and comfort services. These services will postpone the need of a medicalized environment and will allow the elderly to stay longer at home. However, each elderly has specific needs and a deployment environment of such services is likely unique. Furthermore, the needs evolve over time, and so does the deployment environment of the system. In this paper, we propose the use of a model-based development method, the adaptive medium approach, to enable dynamic adaptation of AAL systems. We also propose improvements to make it more suited to the AAL domain, such as considering heterogeneity and a composition model. The paper includes an evaluation of the prototype implementing the approach, and a comparison with related work.

This paper introduces an approach to develop componentbased adaptive distributed applications. Our approach separates the communication and the functional aspects of a distributed application and specifies the communication part as an abstract distributed component called the communication component. We then introduce a model-based process for automatically building many evolutionary variants of this component at deployment level, and integrating these variants into the target adaptive application that can dynamically select the running variant in order to adapt to the changing context. Thanks to an adaptation guide generated by the process, the adaptive application can coordinate distributed adaptations to (1) consistently transfer data of the replaced variant to the new one and (2) maintain the architectural coherence between distributed parts of the application. Hence, the target adaptive application can correctly adapt at runtime without loss of data. In this paper, we present the principle of our approach, illustrate it with an example, and show how we have automated the development process by model transformations.

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