关键词: 普适计算，中间件，上下文质量，上下文感知

Abstract: With the rapid development of the information technology, it is inevitable that the distributed mobile computing will evolve to the pervasive computing gradually whose final goal is fusing the information space composed of computers with the physical space in which the people arc working and living in. I}o achieve this goal, one of the problems is how to continuously monitor/capture and interpret the environment related information efficiently to assure high context awareness. Many attentions have been paid to the research of the context aware pervasive applications. However,most of them just use the raw context directly or take just some aspects of the Quality of Context(QoC) into account.Therefore, we proposed a middleware based context aware framework that supports QoC management in various layers.By this framework we can refine raw context, discard duplicate and inconsistent context so as to protect and provide QoS-enriched context information of users to context-aware applications and services.

Key words: Pervasive computing, Middleware, Quality of context, Context-aware