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Mathematical Problems in Engineering
Volume 2014, Article ID 860729, 6 pages
Research Article

Modeling and Performance Analysis for Cell Access and Handoff Schemes in Two-Tier Cellular Networks

1Department of Embedded Systems Engineering, Incheon National University, Incheon 406-772, Republic of Korea
2Department of Entertainment Engineering and Design, University of Nevada, Las Vegas, NV 89154, USA

Received 7 September 2014; Accepted 3 November 2014; Published 24 November 2014

Academic Editor: Marco Anisetti

Copyright © 2014 Kyungkoo Jun and Sijung Kim. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.


We investigate the effects of handoff on system performance in two-tier cellular networks. Two of the main performance metrics are new call blocking probability and handoff drop rate. We develop analytical models to evaluate the performance of two different handoff schemes. One scheme considers only femto-to-macrocell handoff while the other is bidirectional including macro-to-femtocell handoff. Our model is more elaborate than existing ones which have not considered the mobility of mobile stations. Numerical results show that the bidirectional scheme performs better than the femto-to-macrocell handoff as it achieves lower blocking probability and drop rate.