Unlike Internet which connects people all over the world, Intemet of Things(IoT) is a net of things which connects the marked and intelligent entities by using various of wireless technologies. As technologies of information industry and wireless communication have developed, computing resources surround people. Context-aware systems emerge at this time. Context-aware systems deal with the pervasive contextual information captured by numbers of sensors and then provide users with the right services. IoT features its requirement of dealing with mass data. Due to these characteristics, the current technologies are no longer working well In this paper, we did a survey on the context-aware systems. We made definitions of context and context-aware, introduced the development and applications of context-aware technology,and then considering of IoT,we approached the flow or progress of context-aware system, including context collecting,context modeling and intelligent information processing. Finally, we analyzed the current context-aware architectures and made some improvements.%与互联网不同,物联网(Internet of Things,IoT)通过各类通信技术将具有标识、感知或者执行能力的物理实体互联,形成了"物物互连"的虚拟网络.随着计算机及通信技术的迅速发展,计算资源将遍布人们周围的环境,情景感知技术应运而生.情景感知获得传感器采集的情景信息以后,对信息进行智能处理.自主地为用户提供服务.物联网具有海量信息的特性,传统的情景信息处理方法已不再适用.时物联网情景感知技术进行了详细的介绍,首先给出情景和情景感知的概念及其研究发展和应用.然后,结合物联网特性,以情景感知流程为主线,探讨了信息获取、建模和智能处理等内容.最后,系统结构是情景感知的关键,因此时现有的系统结构进行了分析和对比,结合物联网环境论述了当前情景感知系统的不足之处,并给出了情景感知系统的参考结构.
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