Quality-of-Service
Coordination: Dr.-Ing. K. Hielscher
Methods for the measurement, simulation, and analysis are developed and
investigated in experimental network scenarios. A GPS-based measurement
infrastructure has been developed for highly precise and high-volume
measurements. Simulation models are built either with commercial UML tools
or with WinPEPSY, a tool allowing for queuing network models. Special emphasis
is given on innovative analysis methods for models with a large state space
and with general distributions (non-Markovian models), analysis of large
queuing networks by traffic-based decomposition and matrix-analytic
techniques, as well as deterministic analysis based on network calculus
(for providing QoS guarantees). Research issues include:
- GPS-based measurement infrastructure for a Web cluster
- online and offline clock synchronization
- UML simulation models
- analysis of queuing networks by traffic-based decomposition and matrix-analytic methods
- correlated input modeling by Markovian arrival processes
- WinPEPSY: a modeling tool based on queuing networks
- analysis of large non-Markovian models by iterative rate adjustments
- network calculus and optimization
- performance impact factors in WLANs
- QoS of mechanisms for distributing traffic control messages
People
Events
- Int. Conf. on Quantitative Evaluation of SysTems (QEST 2007)
- Int. Conf. on Analytical and Stochastic Modelling Techniques and Applications (ASMTA 2007)
- GI/ITG Fachtagung Messung, Modellierung und Bewertung von Rechen- und Kommunikationssystemen (MMB 2006)
- Symposium Simulationstechnik (ASIM 2006)
Current Research Projects
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Previous Research Projects
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