Abstract-One of the most important points in context-aware computing is to build a reasonable context model. Currently, many models were not built in a common structure. It is hard to build other models depending on the existing ones. In this paper, we build a common ontology-based context model with Web Ontology Language (OWL), which provides an efficient and convenient way of ontology-building by adding domainspecific concepts into this common model. We show the structure of the model and explain the main concepts of it. With the common model, we propose our solutions to solve the problems of position and context history that may exist in the process of modeling a specific domain. Finally, we show a context model of Beijing Capital International Airport (BCIA), which was built on the common model. A simple reasoning test is run on the BCIA model with Semantic Web Rule Language (SWRL).

In this paper, we propose a process calculus, Context-aware System Calculus (CSC), in order to describe context-aware systems that can maintain context models and carry out some operations, including requesting context-aware services, according to the context rules. Besides, a contextaware system can also communicate with other systems or receive context information from context providers by sharing atoms through channels. We present the motivation and syntax of CSC, and demonstrate a case study to encode a contextaware system into CSC.

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