Automated Modeling and Analysis of CSMA-Type Access Schemes for Building Automation Networks

Abstract

During the design of large technical systems, the use of analytic and simulative models to test and dimension the system before implementation is of practical importance for an efficient and reliable design process. However, setting up the necessary models is time-consuming and therefore often too expensive in practice. Usually most information for modeling is already available in the design tool used to develop such extensive systems and only needs to be extracted for automatic model building. This paper presents an automated modeling approach from an existing design database using the example of a network analysis for building automation fieldbuses. The analysis is based on an analytical decomposition approach that enables fast estimation of performance measures for large-scale networks. The combination of fast analytical algorithms with automatic model generation allows network performance engineering with minimized effort for model generation and analysis.Index Terms-Building management networks, carrier sense multiple access (CSMA), network performance, quality of service, queuing analysis.

Diagnosis and Consulting for Control Network Performance Engineering of CSMA-Based Networks

“…The used bitrate of a channel accumulates from the bitrate of the messages passing the channel. The performance analysis assumes that theses messages are created by the connections between two datapoints on different devices [12]. Each passing connection adds its mean bitrate to the channel mean bitrate (2) Equations (2) and (3) explain why the overload fault of a channel can be traced back to the connections using it.…”

“…The suite combines an automated modeling approach with fast performance analysis methods and permits an efficient use by neither requiring special knowledge nor interrupting the design process significantly [12]. The automated modeling approach [13] creates a system and traffic model from the uniform LNS design database [14] used by most LON design tools.…”

On the Analysis of CSMA-Based Control Nets With Priorities and Multicast

“…Computation of the remaining values is similar to (7) and (9) such that (17) and see (18) at the bottom of the page, where . To compute the final values, the probability of active non-priority types has to be computed.…”

“…Based on the analytical model for a single channel presented in [5], a class of queueing networks and the corresponding analysis algorithms have been developed [4]. Models are generated automatically using the available information in a design database plus a small amount of additional information [18], [19]. Furthermore, a method to analyze single channels with priorities has been proposed in [3].…”

Stability and Bifurcation Analysis of a Class of Networked Dynamical Systems

“…In this way, network utility is significantly reduced while still retaining satisfactory control performance. This thresholdbased control technique, which is also called send-on-delta or Manuscript deadband sampling in the literature, has been investigated in such areas as building automation networks [4], [5], wireless sensor networks [6], and automotive engineering [7]. Since the aforementioned data transmission strategy has attracted much interest in the literature, it is meaningful to study the system dynamics under this scheme.…”