Design And Implementation Of Semantic Gateway For Internet Of Things Based On Device Ontology

With the rapid development of Internet of things,various intelligent devices have entered the life and production of modern human society.With the increase of Internet of things application terminal,distributed Internet of things computing and storage has become a problem and scheme worth considering in the process of Internet of things construction.Meanwhile,users and equipment managers are increasing demand for more intelligent equipment control,among which semantic technology is more and more important to support intelligent services of Internet of things.This paper proposes a semantic Internet of things gateway based on device ontology,which is intended to be a part of the concept of edge computing of Internet of things,which is intended to provide support for intelligent control of devices in the semantic gateway management domain while serving as a decentralized computing and storage node of the Internet of things.Semantic gateway uses ontology to describe the properties and service capabilities of devices.Based on the ontology model designed,this paper proposes a scheme to construct semantic Internet of things gateway based on the current technology and methods of Internet of things system.In the aspect of designing device ontology,this paper analyzes the description method of the current mainstream Internet of things platform for the device properties,and integrates the design of semantic sensor network ontology,and proposes a set of device domain ontology from the user's point of view.The formal representation of device properties and service capability of the device ontology has the characteristics of light weight and flexible scalability,which is the basis of the realization of the important functions of this semantic gateway.This paper proposes a semantic command adaptation method based on device ontology and an access control method which integrates semantics.The former defines the device control method based on semantics,and proposes a device search method,which realizes the semantic command control of the device,and provides a more convenient and intelligent control method than the traditional control method;The latter proposes a convenient and effective access control mechanism for Internet of things devices combined with the use and reasoning of device ontology.In addition,in the design of the message communication part of the semantic gateway,this paper provides a feasible solution for the cross node transmission of remote messages.Based on the analysis of traditional gateway and semantic technology application,this paper determines the function of semantic gateway,designs its service interface,determines the logic structure of gateway,and makes detailed planning and implementation of message analysis,message routing,semantic command adaptation and other functional modules of the device.This paper deployed the software entity of the semantic gateway of Internet of things on the personal computer,and tested the service implemented by the semantic gateway.The services provided by this semantic gateway,including the user and device ontology data access in the gateway management domain,the semantic control of the device,the access control of the device rights,etc.,are verified.This gateway meets the application requirements of sense of device semantic control,and has good availability.