Feasibility study on the planning of base stations placement and improvement for communication quality in Taiwan high speed railway environment
Date Issued
2009
Date
2009
Author(s)
Yih, Huan-San
Abstract
Looking at the trends of the world transportation,the high-speed railway is with no doubt, the best choice for medium and long distances transport mode.Therefore,it is the most important thing to solve the problems that people communicated in the high mobility environments.This study first discussed the mobile communication technologies using in the high mobility environments,and then described the shared infrastructure using in Taiwan high-speed railway(THSR). Considering the impacts such as signal attenuation due to fast moving of THSR and penetration loss caused by metal shell of the train, through the derivation of link budget and propagation model to calculate the reasonable GSM and WCDMA BTS coverage area.Meantime we also calculated the shortest overlapping area between two cells accordin to the needed time of handover or cell reselection procedure.Secondly we adjusted the cell reselection and handover parameters of GSM and WCDMA systems for adapting the high mobility environments to reduce call drop and handover failure ratio. In the end,the study proposed a method of hierarchical cell structure(HCS) and BTS parameters design using in the railway stations to reduce the handover and establishment failure ratio due to the shortage of base station radio resources. By way of adjusting the handover and cell reselection parameters and well planning base stations coverage area,the subscribers taking THSR could have better quality for voice and data services.
Subjects
THSR
HSR
Handover
Cell Reselection
Type
thesis
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