Congestion control of high-speed Gigabit-Ethernet networks for industrial applications

The rapid growth of the Internet and networking infrastructures within organization has provided Gigabit Ethernet network with the opportunity to be utilized for the control of various facilities. High-speed Gigabit Ethernet networks for industrial automation systems promise standardized internetworking between completely different devices without connection and conversion difficulties. The different industrial environment for field and office level has given rise to delay issues. In particular, the fact that the congestion is often accompanied by the discordant data flow is important with respect to the stability of closed-loop congestion control. Due to the peculiarity of CSMA-CD in Gigbit Ethernet networks, it is hard to obtain any sound mathematical formulation for congestion control without employing random processes or fluid-flow models. In this paper, an analytical method for the design of a Smith's principle to overcome instability accompanied with the increase of end-to-end delay as well as to avoid cell losses. Moreover, the method for computing delay margins are used for discriminating stability for a given interval end-to-end delay of Gigabit Ethernet networks. To this end, mathematical analysis is provided by such that the proposed control scheme guaranteed the performance improvement with respect to bandwidth and latency for selected network links different propagation delay. Finally, the proposed control is to be illustrated by a simulation study.