Issues on Communication Network Control System Based Upon Scheduling Strategy Using Numerical Simulations

Nowadays, industry has successfully used Network Control Systems (NCS) therefore several lines of research have arisen. A NCS is a current application of a Real-Time Distributed Systems (RTDS), composed of a number of nodes capable of developing a complete control process. In these systems several nodes exchange information through a communication network to achieve specific control goals, nevertheless network traffic increases. This affects the overall system performance. Several approaches have been developed to satisfy requirements of both control and communication performance. Particularly, some methodologies focus on saving bandwidth, one of such methodologies is network scheduling. The objective of this methodology is the accurately use of the computing resources. NCS research is categorized into two main parts [5]: 1. Control of network: Study and research on communications and networks to make them suitable for real-time NCS, e.g. routing control, congestion reduction, efficient data communication, networking protocol. 2. Control over network: This area deals with control strategies and control systems design over the network trying to minimize the effect of adverse network parameters on NCS performance such as network delay. These systems have many challenges to maintain the the Quality of Service (QoS) and Quality of Control (QoC). In the networks, QoS is the idea that transmission rates, error rates, and other characteristics can be measured and improved. The QoS can be degraded due to congestion and interference.