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Wireless Personal Communications

, Volume 43, Issue 3, pp 889–906 | Cite as

A flexible UMTS/WLAN architecture for improved network performance

  • George Lampropoulos
  • Nikos Passas
  • Alexandros Kaloxylos
  • Lazaros Merakos
Article

Abstract

Current trends in cellular telecommunications suggest the incorporation of Wireless Local Area Networks (WLANs) as supplementary access technologies into the existing cellular infrastructure. Overlay network architectures are expected to improve both service provision and resource utilization under the condition that sophisticated architectural options are followed. Many proposals suggest that all active connections be handled through the same access network technology. However, this is not believed to be efficient in a heterogeneous environment. Therefore, a mechanism that allows each connection of a terminal to be served by different radio access technology is introduced. Based on a tight coupling architecture for interworking between Universal Mobile Telecommunications System (UMTS) and WLANs, the proposed scheme combines a sophisticated decision mechanism with flexible connection management in a way that ensures seamless service continuity during handover. The performance of the system is evaluated using a detailed simulation model and compared against existing architectures. Simulation results indicate an improvement in parameters such as connection and handover blocking probabilities, which justifies the enhancement in the overall usage of network resources when connections are handled separately.

Keywords

UMTS WLAN Tight coupling Seamless service continuity Load balancing 

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References

  1. 1.
    Alexiou, A., & Bouras, C. (2006). Multicast in UMTS: Evaluation and recommendations. International Journal of Wireless Communications and Mobile Computing, Wiley InterScience, doi: 10.1002/wcm.464.Google Scholar
  2. 2.
    Arkko, J., & Haverinen, H. (2006). Extensible authentication protocol method for 3rd generation authentication and key agreement (EAP-AKA), RFC 4187.Google Scholar
  3. 3.
    Balasubramaniam, S., & Indulska, J. (2003). Vertical handover supporting pervasive computing in future wireless networks. Computer Communication Journal, Special Issue on 4G/Future Wireless networks. 27/8, 708–719.Google Scholar
  4. 4.
    Ferrús, R. et al. (2005). Vertical handover support in coordinated heterogeneous radio access networks. In Proceesings of the IST mobile summit 2005, Dresden (Germany).Google Scholar
  5. 5.
    Hui S. and Yeung K. (2003). Challenges in the migration to 4G mobile systems. IEEE Communications Magazine 41(12): 54–59CrossRefGoogle Scholar
  6. 6.
    IEEE 802.11e-2005, “Specific requirements Part 11: Wireless LAN Medium Access Control (MAC) and Physical Layer (PHY) specifications—Amendment 8: Medium Access Control (MAC) Quality of Service Enhancements,” ISBN: 0-7381-4772-9, 2005.Google Scholar
  7. 7.
    Inoue, M., Mahmud, K., Murakami, H., Hasegawa, M., & Morikawa, H. (2003). Seamless handover using out-of-band signaling in wireless overlay networks. In Proceesings of the WPMC’03, Yokosuka, Japan.Google Scholar
  8. 8.
    Jaseemuddin, M. (2003). An Architecture for integrating UMTS and 802.11 WLAN networks. In Proceedings of IEEE symposium on computers and communications (ISCC 2003), Antalya, Turkey, pp. 716–723.Google Scholar
  9. 9.
    Kaloxylos, A., Lampropoulos, G., Passas, N., & Merakos, L. (2006). A flexible mechanism for service continuity in 4G environments. Elsevier Computer Communications Journal, Special Issue on “End-to-end QoS Provision Advances,” 29(6), 669–798Google Scholar
  10. 10.
    Lampropoulos G., Kaloxylos A., Passas N. and Merakos L. (2005). Handover management architectures in integrated WLAN/cellular networks. IEEE Communications Surveys and Tutorials 7(4): 30–44 CrossRefGoogle Scholar
  11. 11.
    Liu, H., Bhaskaran, H., Raychaudhuri, D., & Verma, S. (2003). Capacity analysis of a cellular data system with 3G/WLAN interworking. In Proceedings of the IEEE 58th vehicular technology conference (VTC’F03), Dallas, USA, Vol. 3, 1817–1821.Google Scholar
  12. 12.
    Ma L., Yu F., Leung V.C.M. and Randhawa T. (2004). A new method to support UMTS/WLAN vertical handover using SCTP. IEEE Wireless Communications 11(4): 44–51CrossRefGoogle Scholar
  13. 13.
    McNair J. and Zhu F. (2004). Vertical handoffs in fourth generation (4G) multi-network environments. IEEE Wireless Communications Magazine 11(3): 8–15CrossRefGoogle Scholar
  14. 14.
    Pinto P., Bernardo L. and Sobral P. (2006). Seamless continuity of PS-services in WLAN/3G interworking. Elsevier Computer Communications Journal 29(8): 1055–1064Google Scholar
  15. 15.
    Salkintzis A., Fors C. and Pazhyannur R. (2002). WLAN—GPRS integration for next-generation mobile data networks. IEEE Wireless Communications 9(5): 112–124CrossRefGoogle Scholar
  16. 16.
    Salkintzis, A., Passas, N., & Skyrianoglou, D. (2006). Seamless voice call continuity in 3G and WLANs. In Proceedings of the 9th International Symposium on Wireless Personal Multimedia Communications (WPMC), San Diego, CA.Google Scholar
  17. 17.
    Stewart, R., & Xie, Q. (2001). Stream control transport protocol, RFC 2960.Google Scholar
  18. 18.
    The Network Simulator - ns-2, http://www.isi.edu/ nsnam/ns/.
  19. 19.
    Wallenius, E., Hämäläinen, T., Nihtilä, T., & Luostarinen, K. (2003). 3G interworking with WLAN QoS 802.11e. In Proceedings of the IEEE 58th vehicular technology conference (VTC’F03), Dallas, USA, Vol. 3, pp. 1803–1806.Google Scholar
  20. 20.
    Wang X.G. (2005). An adaptive QoS framework for integrated cellular and WLAN networks. Elsevier Computer Networks Journal 47(2): 167–183CrossRefGoogle Scholar
  21. 21.
    Ylitalo, J. et al. (2003). Dynamic network interface selection in multihomed mobile hosts. In Proceedings of the 36th Hawaii international conference on system sciences, Hawaii, USA.Google Scholar
  22. 22.
    Zhang, W. (2004). Handover decision using fuzzy MADM in heterogeneous networks. In Proceedings of the IEEE wireless communications and networking conference 2004 (WCNC 2004), Atlanta.Google Scholar
  23. 23.
    3GPP TR 22.934 V6.2.0, “Feasibility study on 3GPP system to Wireless Local Area Network (WLAN) interworking (Release 6),” 2003.Google Scholar
  24. 24.
    3GPP TS 43.318 V6.5.0, “Generic access to the A/Gb interface; Stage 2 (Release 6),” 2006.Google Scholar
  25. 25.
    3GPP TR 25.881 V5.0.0, “Improvement of RRM across RNS and RNS/BSS (Release 5),” 2001.Google Scholar
  26. 26.
    3GPP TR 43.901 V6.0.0, “GSM/EDGE Radio Access Network; Feasibility Study on generic access to A/Gb interface (Release 6),” 2004.Google Scholar
  27. 27.
    3GPP TS 23.234 V7.0.0, “3GPP system to Wireless Local Area Network (WLAN) interworking; System description (Release 7),” 2005.Google Scholar

Copyright information

© Springer Science+Business Media, LLC 2007

Authors and Affiliations

  • George Lampropoulos
    • 1
  • Nikos Passas
    • 1
  • Alexandros Kaloxylos
    • 2
  • Lazaros Merakos
    • 1
  1. 1.Department of Informatics and TelecommunicationsUniversity of AthensAthensGreece
  2. 2.Department of Telecommunications Science and TechnologyUniversity of PeloponneseTripoliGreece

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