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Deutsch Intern
    Lehrstuhl für Informatik III

    Handover-Strategien zur Verbesserung der Leistungsfähigkeit von Mobilfunknetzen der 4. Generation gefördert durch die Deutsche Forschungsgemeinschaft (DFG)


    University of Würzburg

    Pol4G Project Team

    HeadsProf. Dr.-Ing. Phuoc Tran-Gia
    (University of Würzburg),
     Adam Wolisz (Technical University Berlin)
    Technical University BerlinResearchersRastin Pries (University of Würzburg),
     Andreas Mäder (University of Würzburg),
     Dirk Staehle (University of Würzburg),
      Sven Wiethölter (Technical University Berlin)

    Project Overview

    The integration of different wireless access technologies like UMTS, WLAN, WiMAX, and meshed networks into a heterogeneous network is one major topic for the near future. Since every access technology has been designed from a different perspective regarding user behavior, supported applications, and QoS requirements, such a heterogeneous network has to take into account the strengths and weaknesses from every technology.

    This project between the Technical University Berlin and the University of Würzburg is funded by the Deutsche Forschungsgemeinschaft (German Research Foundation). The goal of this project is to integrate WLAN and UMTS into one system and to design policies for the handover between these technologies. This work is based on two well-known architectures to couple these technologies: tight as well as loose coupling. Secondly we develop a combined handover and admission control for both technologies which can be either centralized or of distributed manner. This includes either one or several network entities which store the current situation of the network. In order to enable a comparison of both access technologies, an equivalent bandwidth metric has been designed for UMTS as well as WLAN.

    This allows fine-grained handover policies which are far beyond simple best-connect strategies. Due to the evaluation of the current situation in every access technology, our framework enables policies which consider the key strengths and weaknesses of every technology in different situations.


    Publications

    • Pries, R.: Do we need Header Compression for VoIP in Wireless LANs?, EUNICE Summer School (2006).
       
    • Pries, R.: A Network Architecture for a Policy-Based Handover Across Heterogeneous Networks., OPNETWORK 2006, Washington D.C., USA (2006).
       
    • Pries, R.: QoS Traffic in Wireless LAN Overlapping Cells., European Wireless, Athens, Greece (2006).
       
    • Pries, R.: Handover Strategies for Heterogeneous WLAN/UMTS Networks., COST290, Delft, Netherlands (2006).
       
    • Pries, R., Mäder, A., Staehle, D.: A Network Architecture for a Policy-Based Handover Across Heterogeneous Networks.OPNETWORK 2006. , Washington D.C., USA (2006).
       
    • Pries, R., Mäder, A., Staehle, D.: Do we need Header Compression for VoIP in Wireless LANs?12th EUNICE Open European Summer School 2006. , Stuttgart, Germany (2006).
       
    • Pries, R., Heck, K., Tran-Gia, P., Wirth, T.: QoS Traffic in Wireless LAN Overlapping Cells.European Wireless 2006. , Athen, Greece (2006).
       
    • Pries, R.: A Network Architecture for a Policy-Based Handover Across Heterogeneous Wireless Networks., EuroNGI Workshop, Paris, France (2005).
       

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    Lehrstuhl für Informatik III (Kommunikationsnetze)
    Am Hubland
    97074 Würzburg

    Phone: +49 931 31-86631
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