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Computer Science 7

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  4. Modeling of External and Internal Impact Factors on the Performance of Wireless Local Area Networks

Modeling of External and Internal Impact Factors on the Performance of Wireless Local Area Networks

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    • ACOOWEE – Activity Oriented Programming of Wireless Sensor Networks
    • ALF: Autonomous Localization Framework
    • Analysis Methods for Non-Markovian Models
    • A⁵: Development Method for Driver Assistance Systems based on a Domain-Specific Language
    • BioNeting – Bio-inspired Networking
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    • Concurrency in timed usage models for system testing in the automotive domain
    • Data Quality and the Control of Automotive Manufacturing
    • Decentralized organization of future energy systems based on the combination of blockchains and the cellular concept
    • Dienstgütegarantien für Ethernet in der industriellen Kommunikation
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    • Formal verification and validation of test methods for complex vehicle safety systems in virtual environments
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    • MaTeLo (Markov Test Logic)
    • Mo.S.I.S. (Modular Software Engineering for Interoperative Systems)
    • Model support in design, test, and monitoring of image system architectures
    • Modeling of External and Internal Impact Factors on the Performance of Wireless Local Area Networks
    • monk-it – Efficient distributed monitoring, attack detection, and event correlation
    • p2p4wsn – Efficient Data Management in Mobile Sensor Networks using Peer-to-Peer Technologies
    • Pal-Grid: A Comprehensive Simulation Framework for the Palestinian Power Grid
    • Privacy in Vehicular Networks
    • ProHTA: Prospective Assessment of Healthcare Technologies
    • Q.E.D. (QoS Enhanced Development Using UML2.0 and TTCN-3)
    • Quality of Service of Networked Embedded Systems
    • Requirements oriented testing with Markov chain usage models in the automotive domain
    • ROSES – Robot Assisted Sensor Networks
    • Secure intelligent Mobility – Testarea Germany
    • Security and Quality of Service and Aspects in ZigBee-based Wireless Communication
    • Self-organization of SN-MRS systems
    • Sensitivity Analysis of Queueing Networks
    • SkyNet – Communicating Paragliders
    • Smart Grid Services
    • Smart Grid Solar
    • Software-in-the-Loop Simulation and Testing of Highly Dependable Distributed Automotive Applications
    • Support for inter-domain routing and data replication in virtual coordinate based networks
    • SWARM (Storage With Amply Redundant Megawatt)
    • Telematics Services in Hybrid Networks
    • Transmission of Safety-Relevant Sensor Data in Intra-Car Communication Systems
    • Veins 1.0 – Vehicles in Network Simulation
    • Web Cluster Laboratory
    • WinPEPSY-QNS – Performance Evaluation and Prediction System for Queueing Networks

Modeling of External and Internal Impact Factors on the Performance of Wireless Local Area Networks

Project Description

As in tethered local networks (LANs), communication protocols (on different protocol layers) and traffic load have a significant impact on the performance of wireless LANs. Additionally, the wireless channel – especially in the context of mobility of the stations – heavily affects the design and performance of WLANs. This project merges these external and internal impact factors into an integrated simulation model. Key submodels encompass Markovian models for autocorrelated traffic generation and autocorrelated packet losses as well as detailed non-Markovian protocol models (IEEE 802.11, TCP/IP) and random waypoint mobility models. The developed models can be validated by measurements with our software monitor with high-resolution timestamping. Similarly, measurements for lowly loaded and traffic-controlled systems serve to determine model parameters (input modeling).
Model building is based on UML-statecharts extended with timing (an implementation of real-time UML) as provided by the commercial tool AnyLogic (by XJ technologies). This tool also allows for discrete-continuous (hybrid) simulation (as required for mobility modeling). The measurement infrastructure has been successfully applied in a web cluster project and been adapted to the WLAN environment. A dedicated graphical user interface provides access to the netfilter framework of Linux and thus a flexible data collection. Several student workers participated in model building and the implementation of the software monitor leading to various student theses.

Project Period

    2000-08-01 – 2005-03-31

Project Members

  • Prof. Dr.-Ing. Reinhard German
  • Dr.-Ing. Kai-Steffen Jens Hielscher
  • Dr.-Ing. Armin Heindl
  • Prof. Dr.-Ing. Günter Hommel

Sponsered by

  • Deutsche Forschungsgemeinschaft

Related Publications

  1. Christian Resch, Armin Heindl, Kai-Steffen Jens Hielscher und Reinhard German, “Measurement-based modeling of end-to-end delays in WLANs with ns-2,” Proc. 18th Symposium on Simulation Techniques (ASIM), Erlangen, Germany, pp. 254-259, September 2005
  2. Armin Heindl, “Inverse Characterization of Hyperexponential MAP(2)s,” 11th Int. Conf. on Analytical and Stochastic Modelling Techniques and Applications, Magdeburg, Germany, pp. 183-189, Juni 2004
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