Differently, from current interoperability solutions, that generally follow a global approach, INTER-IoT uses a layer-oriented approach for performing complete exploitation of every different layer functions. Despite the research and development challenges that the design of a layer-oriented approach represents, as compared to a global approach, it can provide a tight and superior bidirectional integration between different IoT platforms. Therefore, a multilayer-oriented approach will potentially offer improved performance, ability, flexibility, modularity, dependableness, privacy, trust, and security.
This layer-oriented approach consists of several interoperability solutions, addressed specifically to each level or layer of an IoT deployment: Device-to-Device (D2D), Networking-to-Networking (N2N), Middleware-to-Middleware (MW2MW), Application & Services-to-Application & Services (AS2AS), application-to-Services & Semantics (DS2DS).
Each interoperability infrastructure layer includes a sturdy coupling with adjacent layers Interfaces are controlled by a meta-level framework to produce unrestricted ability. Every interoperability mechanism may be accessed through an API. The interoperability infrastructure layers will communicate and interoperate through the interfaces. This cross-layering permits to realize a deeper and additional complete integration.
Device layer (D2D): Currently applications and platforms are tightly coupled, preventing their interaction with different applications and platforms, sensors and actuators communicate only within one system, certain platforms do not implement some necessary services (i.e. discovery), or do this in an incompatible approach. Roaming elements can be missing or inaccessible.
Network layer (N2N): Today, the immense amount of traffic flows generated by smart devices is extraordinarily difficult to handle. The scalability of the IoT systems is troublesome. Also creating the interconnections between gateways and platforms is a complex task. N2N resolution aims to provide transparent roaming (support for good devices quality) and their associated mobility information. It also enables offloading and roaming, which implies the interconnection of gateways and platforms through the network.
Middleware layer (MW2MW): At the middleware level, INTER-IoT resolution will enable seamless resource discovery and management of IoT smart objects in heterogeneous IoT platforms. Interoperability at the middleware layer is achieved through the institution of an abstraction layer and the attachment of IoT platforms to it. Different modules enclosed at this level can provide services to manage the virtual illustration of the objects, creating the abstraction layer to access all their features and information.
Application & Services layer (AS2AS): INTER-IoT permits the utilization of varied services among totally different IoT platforms. The approach allows discovery, catalog, and composition of services from different platforms. AS2AS will also give an API as an integration toolbox to facilitate the event of new applications that integrate existing heterogeneous IoT services.
Semantics layer (DS2DS): INTER-IoT resolution for the DS2DS layer can enable a standard which means of information and data among different IoT systems and heterogeneous knowledge sources, so providing linguistics ability. It’s supported linguistics translation of IoT platforms’ ontologies to/from a standard IPSM standard metaphysics.
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