An Enhanced Hand-Off Policy to Reduce Blocking Probability in Two-LayerWireless Systems

  • Tae-Jin Lee
Conference paper
Part of the Lecture Notes in Computer Science book series (LNCS, volume 2668)


In this paper, we consider a two-layer hierarchy, i.e. micro and umbrella layer, cellular system, and propose a new hand-off mechanism to minimize call blocking probability of high-speed hand-off calls with reasonable performance of new and low-speed hand-off calls. We used double control for highspeed hand-off calls in micro and umbrella layer. By formulating Markov chains and using queueing analysis, we have derived call blocking probabilities for ours and those of other hand-off schemes. We have shown that our proposed policy can indeed improve blocking probabilities of high-speed hand-off calls, which leads to improved system performance. Our policy can serve as a guideline to design hand-off policies within wireless systems or inter-working policies between systems.


Blocking Probability Guard Channel Channel Assignment Strategy Umbrella Cell Call Blocking Probability 
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  1. [1]
    K. Ioannou, S. Louvros, I. Panoutsopoulos, S. Kotsopoulos, and G. K. Karagiannidis. Optimizing handover call blocking probability in cellular networks with high speed moving terminals. IEEE Communications Letters, 6(10):422–424, Oct. 2002.CrossRefGoogle Scholar
  2. [2]
    L. Kleinrock. Queueing Systems Volume I: Theory. John Wiley & Sons, 1976.Google Scholar
  3. [3]
    M. D. Kulavaratharasah and A. H. Aghvami. Teletraffic performance evaluation of microcellular personal communication networks with prioritized handoff procedures. IEEE Trans. on Vehicular Technology, 48(1): 137–152, Jan. 1999.CrossRefGoogle Scholar
  4. [4]
    X. Lagrange and P. Godlewski. Teletraffic analysis of a hierarchical cellular network. In Proc. of IEEE VTC, pages 882–886, 1995.Google Scholar
  5. [5]
    I. Panoutsopoulos, S. Kotsopoulos, K. Ioannou, and S. Louvros. Priority technique for optimising handover procedure in personal communication systems. IEEE Trans. on Vehicular Technology, 36(7):669–670, Mar. 2000.Google Scholar
  6. [6]
    F. Quessette. Modeling and analysis of UMTS hierarchical networks. In Proc. of International Symposium on Modeling, Analysis and Simulation of Computer and Telecommunication Systems, pages 432–437, 2000.Google Scholar
  7. [7]
    T. S. Rappaport. Wireless Communications. Prentice Hall, 2002.Google Scholar
  8. [8]
    F. Valois and V. Véque. QoS-oriented channel assignment strategy for hierarchical cellular networks. In Proc. of IEEE PIMRC, pages 1599–1603, 2000.Google Scholar
  9. [9]
    I.-S. Yoon and B. G. Lee. DDR: A distributed dyanmic reservation scheme that supports mobility in wireless multimedia communications. IEEE Journal on Selected Areas in Communications, 19(11):2243–2253, Nov. 2001.CrossRefGoogle Scholar
  10. [10]
    J. Zander and S.-L. Kim. Radio Resource Management for Wireless Networks. Artech House, 2001.Google Scholar

Copyright information

© Springer-Verlag Berlin Heidelberg 2003

Authors and Affiliations

  • Tae-Jin Lee
    • 1
  1. 1.School of Information and Communication EngineeringSungkyunkwan UniversitySuwonKOREA

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