Radio Wave Propagation Scene Partitioning for High-Speed Rails

Bo Ai,Yuanxuan Li,Zhangdui Zhong,Pengyu Liu,Ke Guan,Ruisi He,Binghao Chen

doi:10.1155/2012/815232

Bo Ai, Yuanxuan Li + Show 5 more

Open Access

https://doi.org/10.1155/2012/815232

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Abstract

Radio wave propagation scene partitioning is necessary for wireless channel modeling. As far as we know, there are no standards of scene partitioning for high-speed rail (HSR) scenarios, and therefore we propose the radio wave propagation scene partitioning scheme for HSR scenarios in this paper. Based on our measurements along the Wuhan-Guangzhou HSR, Zhengzhou-Xian passenger-dedicated line, Shijiazhuang-Taiyuan passenger-dedicated line, and Beijing-Tianjin intercity line in China, whose operation speeds are above 300 km/h, and based on the investigations on Beijing South Railway Station, Zhengzhou Railway Station, Wuhan Railway Station, Changsha Railway Station, Xian North Railway Station, Shijiazhuang North Railway Station, Taiyuan Railway Station, and Tianjin Railway Station, we obtain an overview of HSR propagation channels and record many valuable measurement data for HSR scenarios. On the basis of these measurements and investigations, we partitioned the HSR scene into twelve scenarios. Further work on theoretical analysis based on radio wave propagation mechanisms, such as reflection and diffraction, may lead us to develop the standard of radio wave propagation scene partitioning for HSR. Our work can also be used as a basis for the wireless channel modeling and the selection of some key techniques for HSR systems.

Highlights

Radio propagation environments may introduce multipath effects causing fading and channel time dispersion
Based on measurements obtained from the Zhengzhou-Xian passengerdedicated line, operating at speeds of around 350 km/h, we have found that the Hata model might result in about 17 dB errors for wireless network coverage prediction, as it does not include the diffraction loss caused by the cuttings along the rails [1]
Scene partitioning is very useful for wireless channel modeling, which is the basis for base stations (BSs) location, wireless network planning, and optimization

Summary

Introduction

Radio propagation environments may introduce multipath effects causing fading and channel time dispersion. Optimization with respect to radio wave propagation will greatly improve the planning of wireless networks for rails Special railway structures such as cuttings, viaducts, and tunnels have a significant impact on propagation characteristics. These scenarios for high-speed rails (HSRs) have rarely been investigated, and few channel measurements have been carried out. The working frequency of the WINNER model is from 2 to 6 GHz, which is not suitable for GSM for railway (GSM-R) wireless network operating at 930 MHz. In addition, the working frequency of the WINNER model is from 2 to 6 GHz, which is not suitable for GSM for railway (GSM-R) wireless network operating at 930 MHz This motivated us to carry out the research on radio wave propagation characteristics under the special scenarios for rails in order to obtain much more accurate path loss prediction results.

Overview of Scene Partitioning Schemes

Special Scenarios for High-Speed Rails

Scene Partitioning Scheme for High-Speed Rails

Findings

Conclusions