On-time delivery of network flows is crucial to ensure the quality of service of deadline-constrained applications. Today, real time applications have various uses in multimedia communications, the Internet of Things (IoT), and 5G (5th generation mobile network) technology. In Software Defined Network (SDN) architecture, the controller has a global view of the network. Hence, it is possible to enrich the features of the controller and/or forwarding devices to support real time communication. In this paper, we propose a firm real time software-defined approach (FRT-SDN) for real time communication and present a novel solution for the real time forwarding/routing of time-sensitive applications in SDN. To this end, FRT-SDN divides traffic into real time and non-real-time flows, prematurely drops late packets that probably miss their deadlines according to a four-stage mathematical modeling, and uses adaptive multipath routing, Earliest Deadline First (EDF) scheduling algorithm, and prioritized queues. We evaluate FRT-SDN with the Mininet tool. Emulation results show that FRT-SDN yields a 23–97% improvement in deadline hit ratio and an 88% decrease in the end-to-end delay and jitter. Hence, it effectively enhances the timeliness of the network. On the other hand, based on the correlation coefficient concept, the effect of network parameters on the average deadline hit ratio has been measured.

网络流的准时交付对于确保受期限限制的应用程序的服务质量至关重要。如今，实时应用在多媒体通信、物联网 (IoT) 和 5G（第 5 代移动网络）技术中有多种用途。在软件定义网络 (SDN) 架构中，控制器具有网络的全局视图。因此，可以丰富控制器和/或转发设备的特性以支持实时通信。在本文中，我们提出了一种可靠的实时软件定义方法 (FRT-SDN) 用于实时通信，并提出了一种用于 SDN 中时间敏感应用程序的实时转发/路由的新颖解决方案。为此，FRT-SDN将流量分为实时流和非实时流，根据四阶段数学建模，过早丢弃可能错过其截止日期的延迟数据包，并使用自适应多路径路由、最早截止日期优先 (EDF) 调度算法和优先队列。我们使用 Mininet 工具评估 FRT-SDN。仿真结果表明，FRT-SDN 的截止命中率提高了 23-97%，端到端延迟和抖动降低了 88%。因此，它有效地增强了网络的时效性。另一方面，基于相关系数的概念，测量了网络参数对平均期限命中率的影响。仿真结果表明，FRT-SDN 的截止命中率提高了 23-97%，端到端延迟和抖动降低了 88%。因此，它有效地增强了网络的时效性。另一方面，基于相关系数的概念，测量了网络参数对平均期限命中率的影响。仿真结果表明，FRT-SDN 的截止命中率提高了 23-97%，端到端延迟和抖动降低了 88%。因此，它有效地增强了网络的时效性。另一方面，基于相关系数的概念，测量了网络参数对平均期限命中率的影响。