ISO/IEC 21823-2:2020 pdf free.Internet of things (IoT) — Interoperability for IoT systems — Part 2: Transport interoperability.
ISO/IEC 21823-2:2020(E) specifies a framework and requirements for transport interoperability, in order to enable the construction of IoT systems with information exchange, peer-to-peer connectivity and seamless communication both between different IoT systems and also among entities within an IoT system.
This document specifies: •
transport interoperability interfaces and requirements between IoT systems; •
transport interoperability interfaces and requirements within an IoT system.
4 Network connectivity for transport interoperability
ISO/IEC 21823-1 [1] 1 describes the overview and a facet model for loT interoperability. Interoperability can be defined as a measure of the degree to which various kinds of systems or components interact successfully. ISO/IEC 21823-1 [1] defines interoperability as the “ability for two or more systems or applications to exchange information and to mutually use the information that has been exchanged”.
There is both interoperability between two or more loT systems, and also interoperability between entities which exist in one loT system. Only with effective interoperability between entities can loT systems be reliably constructed and used, in support of the many loT applications which are being built.
A five-facet model of loT interoperability is introduced in ISO/IEC 21823-1 [1] as shown in Figure 1.
This document covers network connectivity which deals with the transport facet of this model. Network connectivity describes how the many different loT networks connect to one another to enable seamless communication, and how different entities, which may be connected to different networks, are able to interoperate. Network connectivity provides common guidelines for the interconnection and interoperation of different networks and pushes loT large scale application. Network connectivity is a fundamental and key aspect of transport interoperability. Discussion of the other facets of loT interoperability is handled by other parts of ISO/lEC 21823.
As described in ISO/IEC 30141 [2], there are four types of networks in loT systems: user network, service network, access network and proximity network. The relationships and interfaces between these networks for supporting interoperability are described in ISO/IEC 30141 [2].
This document defines a framework of transport interoperability in terms of network connection models, interfaces and stack model.
The connectivity labelled rn-i in Figure 2 represents one or more interfaces for whichever capabilities are offered by each of the loT systems to the other. Communication takes place via the use network which uses any means or protocol that is feasible for this interaction, and in that way both user devices and digital users can communicate with the rest of the loT system, as defined in ISOIIEC 30141 [2]. User network only exists between Resources access and interchange domain. When the entities in an loT system need to collaborate with some entities in another loT system, the entities communicate with the Resources access and interchange domain, which handles connections to other loT systems.
For the two loT systems to interoperate, each of the interfaces in rn-i that are used shall interoperate for transport interoperability. There are many applications that have interoperability requirements. For example, in some industrial applications, two different loT systems share sensor data. The entities in one loT system use these data to make decisions. And then they operate on the entities (such as actuators) in another loT system through the Resources access and interchange domain to achieve interoperation and collaboration between the two loT systems.ISO/IEC 21823-2:2020 pdf free download.