Industrial Internet of Things (IoT) applications have diverse network session requirements. Certain critical applications, such as emergency alert relay, industrial floor evacuation, and surveillance systems, require fresh updates that can maintain the most recently delivered packets. This requires high reconfigurability to an extent where the system can measure the impact of an event and adapt the network accordingly. Several approaches have been proposed that provide high precision transmission and bounded latencies. One prominent solution strategy in the literature is based on Software Defined Networking (SDN) control to resolve latency-related issues, such as congestion, for factory floor transmissions. The OpenFlow protocol is a key interface used in SDN to create a low-latency environment. However, the existing approaches provide only offline solutions that are typically compute intensive. Therefore, this article proposes an algorithm based on simple online strategies that utilize an SDN controller with a global view of the network. More specifically, within the context of the IEEE Time Sensitive Networking (TSN) standards this article: (1) designs a control policy framework called TSN_u that guarantees transmission time-slot allocations for Scheduled Traffic while mitigating network congestion, (2) develops a utility maximization approach to jointly optimize scheduling, routing, and admission control while ensuring network stability and maximizing the flow admission to the network, and (3) presents extensive theoretical analysis and simulation to evaluate the proposed TSN_u design. The conducted evaluations indicate substantially improved performance compared with state-of-the-art policies.

工业物联网（IoT）应用程序具有多种网络会话要求。某些关键应用（例如紧急警报中继，工业车间疏散和监视系统）需要可以维护最新传送的数据包的最新更新。这就要求高度可重新配置，以使系统可以测量事件的影响并相应地调整网络。已经提出了几种提供高精度传输和有限时延的方法。文献中一种突出的解决方案策略是基于软件定义网络（SDN）控件，以解决与延迟相关的问题，例如工厂车间传输的拥塞。OpenFlow协议是SDN中用于创建低延迟环境的关键接口。然而，现有方法仅提供通常需要大量计算的离线解决方案。因此，本文提出了一种基于简单在线策略的算法，该策略利用具有全局网络视图的SDN控制器。更具体地说，在IEEE时间敏感网络（TSN）标准的上下文中，本文：（1）设计一种称为TSN的控制策略框架_u既保证调度流量的传输时隙分配，又减轻了网络拥塞，（2）开发了一种效用最大化方法，可以在优化网络，流量和网络准入的同时共同优化调度，路由和接纳控制，以及（3 ）提出了广泛的理论分析和仿真，以评估提出的TSN _u设计。进行的评估表明，与最新的政策相比，绩效得到了显着改善。