Handover-Strategien zur Verbesserung der Leistungsfähigkeit von Mobilfunknetzen der 4. Generation

gefördert durch die Deutsche Forschungsgemeinschaft (DFG)

---

Pol4G Project Team

University of Würzburg				Technical University Berlin
	Department of Distributed Systems
	Head Prof. Dr.-Ing. Phuoc Tran-Gia Researchers Rastin Pries Andreas Mäder Dirk Staehle			Head Adam Wolisz Researchers Sven Wiethölter

---

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.

---

Papers

1. Rastin Pries, Andreas Mäder, and Dirk Staehle
   Do we need Header Compression for VoIP in Wireless LANs?
   to be published at the 12th EUNICE Open European Summer School 2006, Stuttgart, Germany, September 2006.
   [Bibtex]


2. Rastin Pries, Andreas Mäder, and Dirk Staehle
   A Network Architecture for a Policy-Based Handover Across Heterogeneous Networks.
   OPNETWORK 2006, Washington D.C., USA, August 2006.
   [PDF (441 kB)] [Bibtex]


3. Svetoslav Yankov and Sven Wiethölter.
   Handover Blackout Duration of Layer 3 Mobility Management Schemes.
   Available as Technical Report No. TKN-06-002, Telecommunication Networks Group, Technical University of Berlin, May 2006.
   [PDF (498 kB)]


4. Rastin Pries, Klaus Heck, Phuoc Tran-Gia, and Thomas Wirth.
   QoS Traffic in Wireless LAN Overlapping Cells.
   European Wireless 2006, Athen, Greece, April 2006.
   [PDF (298 kB)] [Bibtex]


5. Sven Wiethölter.
   Virtual Utilization and VoIP Capacity of WLANs Supporting a Mix of Data Rates.
   Available as Technical Report No. TKN-05-004, Telecommunication Networks Group, Technical University of Berlin, September 2005.
   [PDF (301 kB)]

Talks

1. Rastin Pries.
   Handover Strategies for Heterogeneous WLAN/UMTS Networks.
   The 5th COST290 MC meeting, Delft, Netherlands, February 2006.
   [PDF (543 kB)]


2. Rastin Pries.
   A Network Architecture for a Policy-Based Handover Across Heterogeneous Wireless Networks.
   EuroNGI Workshop on QoS and Traffic Control, Paris, France, December 2005.


3. Sven Wiethölter.
   Handover Policies for Combined WLAN/UMTS Networks.
   15. Treffen der VDE/ITG Fachgruppe 5.2.4 (Mobilität in IP-basierten Netzen), Aachen, Germany, September 2005.
   [PDF (1746 kB)] [Animated slides]


4. Dirk Staehle.
   DFG-Projekt Pol4G. Handover-Strategien zur Verbesserung der Leistungsfähigkeit von Mobilfunknetzen der 4. Generation
   DFG-Kolloquium zum Schwerpunktprogramm "Adaptivität in heterogenen Kommunikationsnetzen mit drahtlosem Zugang (AKOM)", Karlsruhe, Germany, February 2005.