基于实体-数据的物联网服务建模

Entity-data-based Modeling for Internet of Things Services

物联网服务作为信息世界软件服务通过物联网向现实世界的延伸,其在物联网系统具有重要的作用.然而,不同于传统Web服务,物联网服务具有现实感知、数据驱动、异构分布、时空相关等新特点,使得现有的服务模型不足以对物联网服务有效刻画,进而也不能满足物联网应用中的后续服务发现、服务卸载、服务组合等需求.在凝练分析物联网服务建模需求和已有物联网服务模型的基础上,提出了一种基于实体-数据的物联网服务建模框架,该框架提出了服务、实体、数据三元信息融合的物联网服务模型概念及概念关系,重点定义了服务、实体、数据的时空属性及时空依赖关系,以支持基于时空相关性的物联网服务关联表示与分析,并通过扩展OWL-S(ontology Web language for services)给出了基于实体-数据的物联网服务描述方式.最后,结合一个高速公路物联网应用案例对模型的使用方式和效果进行了讨论.

As an extension of software services in the information world to the real world through the Internet of Things(IoT),IoT services have an important role in IoT systems.However,unlike traditional Web services,IoT services have new characteristics such as reality perception,data driving,heterogeneous distribution,and spatio-temporal correlation,which make the existing service models insufficient for an effective portrayal of IoT services and fail to meet the requirements of subsequent service discovery,service offloading,and service combination in IoT applications.On the basis of condensed analysis of IoT service modeling requirements and existing IoT service models,an entity-data-based IoT service modeling framework is proposed,which puts forward the concept of IoT service models fusing ternary information of service,entity,and data and their conceptual relationships.In addition,the framework focuses on defining the spatio-temporal attributes and dependencies of service,entity,and data to support IoT service association representation and analysis based on spatio-temporal correlation,and the entity-data-based IoT service description method is given by extending ontology Web language for services(OWL-S).Finally,the usage mode and effects of the model are discussed in the context of a highway IoT application case.