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

Abstract

Network performance engineering can verify the design and dimensioning of large-scale control networks like CSMA-based building automation networks. It combines performance analysis with diagnosis methods to evaluate the network utilization and to detect design errors before installation and can therewith save the expenses of overdimensioning and redesign. This paper will develop a diagnosis model based on fault trees that is able to use the huge amount of performance analysis results to identify design errors and analyze their coherences. This enables not only a fast tracing back of fault causes and the derivation of solutions; it can also visualize the fault coherence to the user and help him to understand his design. Additional consulting tools implement best practice strategies, to support the user in parameterization.Index Terms-Building management networks, carrier sense multiaccess, diagnosis, network performance engineering, quality of service.

The GMPLS Controlled Optical Networks as Industry Communication Platform

“…• Mean Time To Repair (MTTR)-the average time taken to repair a failed hardware or software module. Another parameter frequently used to describe reliability is an availability (A) defined as (1) Thus, in order to increase availability of system, MTTF should be maximized and/or MTTR should be minimized. A network is a complex interconnected system with components characterized by individual MTTR and MTTF parameters.…”

Holistic design of wireless building automation systems

“…A common measure for network design quality is the Quality of Service provided by the network [11,21], which defines boundaries to delay times and loss rates for a design. Nevertheless, to evaluate the quality of service in a network, a performance analysis of the design is inevitable.…”

“…However, message repetition as well as increased sender signal power cost additional energy, which is limited in wireless devices. Therefore, the system design quality is evaluated by performance analysis which builds upon the performance engineering approach introduced in [21]. It has been extended with a simulative and analytic analysis approach for the EnOcean protocol [22].…”

Comparative Study of Energy-Efficient Sampling Approaches for Wireless Control Networks

“…Transmission delays are usually below 100 milliseconds in wired networks [33], but can be larger in wireless networks due to message caching in multihop transmissions if hops have different sleep cycles. Transmission delays are critical for the control if they are in the range of the control times.…”

“…With a sample period of 1 s, the illumination sensor requires 248 for wake-up, sampling and sending each sample. Sampling with 10 s requires 13% of this power (33 ) with nearly identical . The power falls to 11 for a sampling period of 90 s. Thus, the sampling period influences directly proportional the and inversely proportional the power consumption creating the typical tradeoff for all sampling approaches in Figs.…”