Response Time Guarantees For Atm-Networked Control Systems

We present the Response-Time Analysis (RTA) method for providing real-time guarantees in Asynchronous Transfer Mode (ATM) communication networks, and evaluates its suitability for use in hard real-time factory-type environments. RTA provides an analysis of the network traffic which can be used by an admission control mechanism to determine if the timing requirements of a new connection can be guaranteed without violating the requirements of already admitted connections. This type of admission control is required by several multimedia and almost all real-time control applications. RTA is based on traditional fixed-priority/rate-monotonic real-time CPU schedulability analysis. This makes it possible to combine communication analysis with CPU schedulability analysis, thus allowing system designers to use the same technique for assessing the timely behaviour of the entire system, including both CPU and network scheduling. The only assumption RTA makes about the ATM-network is that the swit..