Research On The Key Technologies Of Heterogeneous Environment Interoperability In Internet Of Things

The Internet of things plays an important role in the future internet.With the development of the Internet of things, more and more Internet of things system has been built up. However, the development of the Internet of things is under a closed, tightly coupled construction mode from the beginning until now. The lack of interaction between the Internet of things system leads to the creation of shafts. This situation is harmful to the future development of the Internet of things. There are many reasons for the creation of shaft, such as business, security, technology, etc. This paper attempts to explore the way to solve this problem from a technical point of view.From a technical point of view, an important reason for the problem of shaft problem is the heterogeneity of the Internet of things. This paper focuses on the research of key technology of interoperability between heterogeneous application systems networking. Based on SOA, combining with the research method of semantics, we propose a service heterogeneous networking organization, publishing and retrieval framework which provides the basic guarantee for heterogeneous network interoperability and propose the optimization algorithm of semantic based service discovery algorithm. The main contributions of this paper are as follows.1) A heterogeneous IoT resource meta model is proposed. In order to extract the commonness of the resources in the Internet of things and to be compatible with the differences of the heterogeneous network resources,this paper proposes a scalable resource description meta model of the Internet of things based on the MOF framework which can describe all kinds of heterogeneous resources in the Internet of things. On this basis,this paper establishes a heterogeneous metadata mapping model, which provides a framework for the conversion and mapping between different types of protocols. The results of this chapter lay the foundation for the following chapters.2) The concept of Internet services is proposed. In order to solve the problem of access to interoperability of heterogeneous systems, this paper proposes a LDAP based information sharing framework. The framework is based on the idea of service.It constructs internet application services object class model and creates the Internet application services directory information tree. The name service mechanism of Internet application services and semantic retrieval mechanism is established ,which provides the entrance for all kinds of heterogeneous networking application system interoperability.3) An improved gene based ontology encoding method for multiple inheritance is proposed. In order to solve the problem of LCA and multi inheritance in the matchmaking algorithm, this paper analyzed the semantic based service matching algorithm and propose an improved genetic algorithm based on the multi ontology coding method. The simulation results show that the proposed method can improve the efficiency of the key algorithm of service matching.4) An improved probabilistic approach to service discovery based onprobabilistic topic model is porposed. In order to solve the problem of huge search space for Internet of things, this paper proposes an improved method based on probabilistic topic mode. In this method, LDA is used to describe the probability of service, and the service search space is divided according to the improved K-means clustering method. The simulation results show that this method can reduce the number of search space, improve the service retrieval speed and reduce the response time.Based on the previous chapters, this paper proposes a public service architecture of Internet of things to solve the acess problem of low computing power and less storage resources in the Internet of things. The architecture describes the node in the Internet of things in a semantic way and interact with the sensor layer. It Shields communication protocol and provide uniform service interface and context information push to application layer by means of subscription and publication. The effectiveness of the architecture is proved by a prototype system.In order to verify the effectiveness of the proposed framework and algorithm, this paper designed and implemented a series of prototype system. These prototype systems prove that the proposed framework and model can effectively solve the key problems of the IoT heterogeneous environment interoperability.