Fuzzy-based Cell Selection and Adaptive Repacking Strategy for Channel Assignment in Hierarchical Cellular Systems

• Main Authors: Lin-Yi Peng, 彭令儀
• Other Authors: Chien-Pen Chuang
• Format: Others
• Language: zh-TW
• Published: 2007
• Online Access: http://ndltd.ncl.edu.tw/handle/56521897885795301368

碩士 === 國立臺灣師範大學 === 應用電子科技研究所 === 95 === Since the traffic in mobile communication system increase rapidly, the radio channels are unable to meet the demand and must be assigned more accurately. It is possible to improve the channel allocation efficiency by upgrading the utility rate of spectrum. Further, the flexible application of hierarchical structure can be used to increase the coverage area and improve the utility rate of channels. In this thesis, Fuzzy Path Selector was developed to make path selection to meet the property of balanced-load cellular network. Fuzzy Cell Selector then was used to determine the cellular layer according to the velocity of MS and the resource state of cells to reduce the blocking rate. Third, Channel Assignment Evaluator was used to do adaptive repacking for reducing the dropping rate. The simulation results of proposed strategy in this thesis improved the blocking rate of 13.48% and the handoff rate of 56.48％ compared to traditional threshold controlling mechanism. It can be a better choice for improving channel allocation efficiency.