Abstract
The Internet of Things (IoT) paradigm feeds from many scientific and engineering fields. This involves a diversity and heterogeneity of its underlying systems. When considering End-to-End IoT systems, we can identify the emergence of new classes of problems. The best-known ones are those associated to standardization for better interoperability and compatibility of those systems, and those who gave birth of new paradigms like that of Fog Computing. Predicting the reliability of an End-to-End IoT system is a problem belonging to this category. On one hand, predicting reliability can be mandatory, most times, before the deployment stage. On another hand, it may help engineers at the design and the operational stages to establish effective maintenance policies and may provide the various stakeholders and decision-makers a means to take the relevant actions. We can find in the literature works which consider only fragments of End-to-End IoT systems such as those assessing reliability for Wireless Sensors Networks (WSN) or Cloud subsystems, to cite just a few. Some other works are specific to well-defined industries, like those targeting reliability study of E-health and Smart-Grid infrastructures. Works that aims to assess reliability for an End-to-End IoT system are remarkably rare and particularly restrained in terms of expressiveness, flexibility, and in their implementation time complexity. In this paper, we apply the Reliability Block Diagram (RBD) paradigm to set up a framework for End-to-End IoT system reliability modeling and analysis. Our contribution is four-fold: we propose an IoT network-based layered architecture, we model in depth each layer of the proposed architecture, we suggest a flow chart to deploy the proposed framework, and we perform a numerical investigation of simplified scenarios. We affirm that the proposed framework is expressive, flexible, and scalable. The numerical study reveals mission time intervals which characterize the behavior of an IoT system from the point of view of its reliability.
Highlights
The research effort in the Internet of Things (IoT) field has received increasing attention from the research community
Some of them are introduced through consortiums or forums where stakeholders are widely known companies that participate actively to decide on the future of the IoT metamorphisms like the IoT World Forum (IoTWF) [36]
We observe that the parallel and series components contribute with the same shape, but the series ones decrease very quickly comparing to the parallel ones
Summary
The research effort in the Internet of Things (IoT) field has received increasing attention from the research community. Starting from this IoT layered architecture, we will introduce a system model on which we will apply the RBD analysis approach to set up a framework for End-to-End reliability analysis. Reliability assessment tools such as RBD have been used in many engineering disciplines, their usage in the IoT field is still moderate The novelty in this approach resides in extending the RBD paradigm for assessing the reliability of any component of the proposed architecture independently its architectural level and nature (software, hardware, etc.). This conceptual contribution can be useful in the design stage.
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