Dropped-call probability in high speed railway environment

doi:10.3785/j.issn.1008-973X.2015.04.014

JOURNAL OF ZHEJIANG UNIVERSITY (ENGINEERING SCIENCE)

WU Duan-po, JIN Xin-yu, JIANG Lu-rong, OUYANG-Bo

Department of Information Science and Electronic Engineering, Zhejiang University, Hangzhou 310027, China

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Abstract

The dropped-call probability caused by handoff in high speed network environment was analyzed without considering the impact of Doppler effects on dropped-call probability. Starting from the study of handoff in high speed network, the handoff probability in different positions was deduced, and the dropped-call probability in different positions was gained to propose a model of dropped-call probability analysis. The dropped-call probability in GSM-R and LTE-R was simulated. The average dropped-call probability in LTE-R is about 29.23% lower than GSM-R. The dropped-call probability with different train through loss was simulated. The larger the train through loss is, the higher the dropped-call probability is. The average dropped-call probability can rise to 0.8% when train through loss is 24 dB. The dropped-call probability with different train speed was simulated. The faster the train speed is, the higher the dropped-call probability is. The average dropped-call probability with the speed of 540 km/h is 151.56% higher than the speed of 60 km/h. The dropped-call probability with fault base station was simulated. The average dropped-call probability with normal base station is just 36.3% of the condition with a fault base station.

Published: 01 April 2015

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WU Duan-po, JIN Xin-yu, JIANG Lu-rong, OUYANG-Bo. Dropped-call probability in high speed railway environment. JOURNAL OF ZHEJIANG UNIVERSITY (ENGINEERING SCIENCE), 2015, 49(4): 705-710.

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http://www.zjujournals.com/eng/10.3785/j.issn.1008-973X.2015.04.014 OR http://www.zjujournals.com/eng/Y2015/V49/I4/705

高速铁路网络环境下掉话率分析

在不考虑多普勒频移对网络掉话率影响的前提下,分析高速铁路网络环境下由于越区切换引起的网络掉话率.从高铁网络的越区切换研究出发,得出不同位置的越区切换概率,获得不同位置的掉话概率,提出掉话分析模型.通过对高铁GSM-R和LTE-R网络进行掉话率对比仿真发现,LTE-R网络的掉话率比GSM-R网络减小了约29.23%；通过对不同列车穿透损耗下的掉话率进行对比仿真发现,穿透损耗越大,掉话率越高,24 dB的穿透损耗下掉话率达到0.8%；通过对不同运行速度下的网络掉话率对比仿真发现,列车运行速度越高,网络掉话率越高,LTE-R网络下540 km/h相比60 km/h的掉话率提高了151.56%；通过对基站故障情况下的网络掉话进行仿真发现,基站正常时的平均掉话率仅为基站故障后平均掉话率的36.3%.

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