Research On Context Aware System Modeling Method Based On ECA Rule

With the rapid development of computer and communications technology, people have been living in a service-rich pervasive digital environment. The idea of ubiquitous computing is that the computer should be embedded into the environment and integration with the environment, and people do not really know the existence of the computer when he was using the computer, thus to return to the human-centered computing model. Context awareness can realize service transparency by perceiving relevant environmental information, providing a service suitable for environment automatically. ECA rule has been widely used in the context-aware system because of its strong semantic expression ability.The generation process of ECA rule is complicated, because of the difficulty of standardizing the extraction method and ensuring the correctness. In the meantime, with the development of ubiquitous computing, multi-service environment is gradually formed, so service conflict becomes an increasingly prominent problem caused by initiative and situational drive characteristic of pervasive service. In view of these problems, this paper researches about the ECA rule modeling method. Starting from the context awareness, this paper puts forward a method of ECA rule modeling in context aware system, and then analyzes the consistency detection and conflict detection method of ECA rule.This paper analyzes the research status of ubiquitous computing firstly, clarifies the existing problems of ubiquitous service modeling process, takes the ECA rule as logical modeling tool of service in context aware system, and then introduces the method of ECA rule modeling and classification of event, defines the syntactic structure of ECA rule, as well as template specification of condition and action. Based on the study of scenario analysis, this paper introduces the ECA rule extraction method based on scenario analysis, set the mutually exclusive and compatible relationship between actions, as well as the preceding relationship of events, and makes consistency detection; secondly, it proposes the ECA rule conflict detection method based on SWRL, defines the concept and types of conflict, build meta-rule of resource consumption and resource state transition, separately, analyzes the semantic of the service behavior by using meta-rule, identifies and detects conflict of service behavior and logic, and then obtains conflict of ECA rale; finally, this paper studies an example in order to introduce the method’s implementation process. The result of the study in this paper shows that the ECA rule modeling method not only solves some problems of building service logic model under context aware system and regulates the ECA rule extraction process, but also solves the part of conflict detection problem of ECA rule. It will ensure the initiative of ubiquitous service and the openness of context awareness system and lay the foundation for further research by using the method proposed in this paper.