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| A User-Classified Method for Modeling and Analysis of Hierarchical Cellular Networks |
| Liu Li; Jing Tao; Fu Li |
| Institute of Electronic Information Engineering, Beijing Jiaotong University, Beijing 100044, China |
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Abstract As continuing growth in traffic volume from users with varying degrees of mobility in wireless networks, a Hierarchical Cellular Structures (HCS) has been suggested. In this paper, the performance of a two-tier microcell/macrocel1 cellular system with bidirectional call-overflow scheme is studied, where cell selection in hierarchical architecture is based on the velocity of the mobile making the calls. Different from the general layer-classified (macrocell and microcell) analysis, a user-classified (fast and slow) modeling method is developed for evaluating the performance of such systems. The user-classified models consist of a fast user model and a slow user model both of which are simple one-dimension Markov process transition diagrams. Theoretical analysis and numerical evaluation show that the analytical models are reliable. Furthermore, effect of velocity threshold and blocked call repeat phenomenon using the models are examined.
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Received: 14 March 2006
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2007, Vol. 29 
