Memorias de investigación
Communications at congresses:
LTE as the future railway communication system: benefits and challenges

Research Areas
  • Electronic technology and of the communications

Now, commercial 3GPP standard, Long Term Evolution (LTE) is being deployed in several countries and it is expected to have and important global development in 2014. At the same time Global System for Mobile communications (GSM) technology, which is the base for GSM-R communication system, is being deprecated. Current GSM-R system can only give support to narrowband applications, which is a limitation factor for enhancing both the commercial and the technical aspects of network operation. Regarding this concerns, it is important to look ahead and start an evaluation process for selecting the future railway communication radio system. LTE technology is a potential candidate to become the new radio mobile system in railway environments. The migration process towards 4G LTE system, may start in 2015 and will last 10- 15 years. However, if railway operators want to benefit from a real Cut Of The Shell (COTS) solution, it is necessary to perform now an evaluation process of the LTE system to assess if current LTE 3GPP standard can give support to current GSM-R railway functionalities. In this paper, the main challenges associated with the migration process towards LTE, will be assessed. These challenges comprise, among others, the next key topics: Reliability, Availability Maintainability and Safety (RAMS) requirements, end to end Quality of Service (QoS) requirements, system performance in high speed scenarios, communication system deployment strategy, and system backward compatibility as well as the future system features for delivering railway services. The practical evaluation of some of the LTE system capabilities, for example, the evaluation of the radio propagation channel for broadband systems, the radio planning and the performance in High Speed Railway (HSR) scenarios, require the development of a LTE demonstrator and a LTE system level simulator. Under this scope, a RF LTE demonstrator has been designed and built. Besides, a software simulator of the LTE system has been designed and developed. These tools will provide valuable information for the assessing of LTE performance and suitability in real HSR scenarios. This work is being developed under the framework of a research project to evaluate the feasibility of LTE to become the new railway communication system. The companies and universities involved in this project are: Alcatel Lucent Spain, ADIF (Spanish Railway Infrastructure Manager), Metro de Madrid, AT4 Wireless, the University of A Coruña (UDC), University of Málaga (UMA) and Technical University of Madrid (UPM).
WRCC 2013. Tenth World Congress on Railway Research
Sidney (Australia)
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  • Autor: Jaime Calle Sanchez UPM
  • Autor: Mariano Molina García UPM
  • Autor: David de Antonio Monte UPM
  • Autor: Jose Ignacio Alonso Montes UPM
  • Autor: Jean Raphael Olivier Fernández UPM
  • Autor: Carlos López Martínez UPM
  • Autor: Sergio Pérez Jiménez UPM
  • Autor: Cesar Briso Rodriguez UPM
  • Autor: Alfonso Fernández Durán Alcatel Lucent Spain

Research Group, Departaments and Institutes related
  • Creador: Grupo de Investigación: Microondas y Radar
  • Departamento: Ingeniería Audiovisual y Comunicaciones
  • Departamento: Señales, Sistemas y Radiocomunicaciones