AAL (Ambient Assisted Living) existing architectures lack the sense of abstraction. The overall existing designs propose a set of elements combined with specific technologies. These visions of AAL systems narrows the possibilities and the choices ahead of the engineers and strict the range of using new technologies, which are likely to be easier and affordable. In this paper, we propose a context-aware RA (Reference Architecture) suitable for the design of distributed AAL systems. Our design is standardized and technology independent. Our aim is to provide a common background for developers and deployers to achieve a common understanding while designing the systems. The major gain is to reduce the efforts made while integrating several systems into one complete and stable environment. Ignoring all the specifications, the details and the objectives of the systems, we introduce the standard qualifications, practices and experiences that assimilate the core of every AAL oriented system. Our perception is global, unified and standard. In addition, it presents an infrastructure that would survive the evolution of technologies. It is adjustable and adaptable to the different possibilities of AAL applications.