End-to-end QoS Routing Scheme in Industrial Internet of Things Managed by Software-Defined Networking Platform

Software-Defined Networking (SDN) technology provides higher programmability and centralized management in Industrial Internet of Things (IIoT)/industrial networks. Besides, it renders dynamic reconfiguration in order to optimize routing between controlled devices. Consideration of multiple metrics for Quality of Service (QoS) routing offers a precise network scheme and improves the performance compared to a single-metric. By applying the SDN platform, there is a possibility to build the forwarding paths based on multiple metrics such as delay, loss probability, and bandwidth, which are the paramount QoS requirements for many IIoT applications. This means that the performance is affected remarkably if the packet loss and delay exceed a definite limit and may become unsuitable for the endpoint. In this paper, an optimum path routing is used to ensure multiple constraints in Software-Defined-IIoT (SD-IIoT). With the use of this optimum path, the Reactive Flow Creation (RFC) approach increases the delay in the data transmission. This does not guarantee the delay-sensitive requirements for IIoT applications. To solve this issue, we propose dual solutions for flow creation: the optimized Proactive Flow Creation (PFC) approach and the combination of Reactive and Proactive Flow Creation (RPFC) approach. The improvement and capacity of the newly proposed approaches are demonstrated through the performances of reducing packet loss and delay with the consideration of both wired and wireless networks in a testbed setup.