ABSTRACT
This chapter describes the data acquisition framework of the GAMBAS middleware. The description includes discussions on the framework architecture, including the component system for developing context recognition applications and the activation system for enabling automatic, state-based activation of different configurations. The chapter also provides insight into the design rationale for the system. This includes a discussion of the motivation behind the component-based approach for context recognition, the chosen component model, energy-efficient techniques to perform context recognition on resource-constrained mobile devices, etc. Furthermore, rationale behind the state machine abstraction for the activation system and how energy optimization techniques used in the component system are fully utilized by the activation system is given. Before we discuss the framework, however, we first outline related work and clarify the innovations and research gaps closed by the data acquisition framework.
