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Reliability and Availability Evaluation of Wireless Sensor Networks for Industrial Applications

机译：工业应用无线传感器网络的可靠性和可用性评估

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摘要

Wireless Sensor Networks (WSN) currently represent the best candidate to be adopted as the communication solution for the last mile connection in process control and monitoring applications in industrial environments. Most of these applications have stringent dependability (reliability and availability) requirements, as a system failure may result in economic losses, put people in danger or lead to environmental damages. Among the different type of faults that can lead to a system failure, permanent faults on network devices have a major impact. They can hamper communications over long periods of time and consequently disturb, or even disable, control algorithms. The lack of a structured approach enabling the evaluation of permanent faults, prevents system designers to optimize decisions that minimize these occurrences. In this work we propose a methodology based on an automatic generation of a fault tree to evaluate the reliability and availability of Wireless Sensor Networks, when permanent faults occur on network devices. The proposal supports any topology, different levels of redundancy, network reconfigurations, criticality of devices and arbitrary failure conditions. The proposed methodology is particularly suitable for the design and validation of Wireless Sensor Networks when trying to optimize its reliability and availability requirements.
机译：当前，无线传感器网络（WSN）代表将被用作工业环境中过程控制和监视应用中最后一英里连接的通信解决方案的最佳人选。这些大多数应用程序都具有严格的可靠性（可靠性和可用性）要求，因为系统故障可能会导致经济损失，使人员处于危险之中或导致环境破坏。在可能导致系统故障的不同类型的故障中，网络设备上的永久性故障具有重大影响。它们可能会长时间干扰通信，从而干扰甚至禁用控制算法。缺乏能够评估永久性故障的结构化方法，使得系统设计人员无法优化决策以最大程度地减少此类故障的发生。在这项工作中，我们提出一种基于故障树自动生成的方法，以在网络设备上发生永久性故障时评估无线传感器网络的可靠性和可用性。该提案支持任何拓扑，不同级别的冗余，网络重新配置，设备的关键性和任意故障情况。当试图优化其可靠性和可用性要求时，所提出的方法特别适合于无线传感器网络的设计和验证。

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