Abstract
In the automotive and rail domains, vehicles are entering the era of full automation thanks to wireless sensors and communication systems, shifting control functions from a human driver to computers. High data rate, robustness, high reliability and ultra-low latency wireless communications are required in the context of autonomous train and safety critical applications. Today, the Future Railway Mobile Communication System (FRMCS) is under development at European level within the International Union of Railways (UIC). This system will answer all the current and future needs of rail. It will be IP based, multi-bearer and resilient to technology evolution. In the context of the development of different FRMCS prototypes by industry, it is crucial to be able to test them in representative Railway radio environments thanks to laboratory tools. Characterization of radio channels in railway environments, by measurements or simulations, is a very active field. In this article, based on broad literature survey, we show that not all the published models are suitable for performance evaluation. Then, we propose a selection of typical Tapped-Delay-Line channel models to be implemented in an original hardware and software testing platform capable to reproduce the effect of representative Railway environments in laboratory, with real time emulation at RF (Radio Frequency) level. Preliminary results in Hilly 3 taps and Cutting 5 taps channel models are presented as a proof of concept of a “zero on site testing” approach, allowing for time and cost savings in the validation of railway communication systems.
Highlights
The deployment of various wireless communication devices is increasing in the railway domain, both for passenger applications and train operation, to increase safety and efficiency [1]
We highlighted that the literature is incomplete and not all railway scenarios have a model that can be used for channel emulation and radio link performance evaluation
The work has permitted to identify a set of suitable Tapped Delay Line (TDL)-based channel models for the following railway-related scenarios:
Summary
The deployment of various wireless communication devices is increasing in the railway domain, both for passenger applications and train operation, to increase safety and efficiency [1]. We have considered channel models obtained with measurements and simulations along high speed lines and tunnels, which can be considered to be implemented in the Emulradio4Rail platform to represent railway environments. GENERAL ARCHITECTURE OF THE PLATFORM The Emulradio4Rail platform is a H&S platform built to offer a laboratory equipment able to evaluate, in real time with real signals, the end-to-end performances of the prototypes of the new communication system for railway, developed within the X2RAIL-3 project [92] in the framework of the Shift2rail Join Undertaking These prototypes operate in SISO mode at the moment with several bearers in parallel: two LTE (one public and one private), one Wi-Fi and one satellite. This article presents preliminary results obtained on short test-runs (100 s), to serve as a proof of concept of the chosen methodology and to validate the overall platform
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