Author: Li, Man Fai
Title: LTE based seamless and real-time infotainment for high speed railway system
Degree: M.Sc.
Year: 2014
Subject: Long-Term Evolution (Telecommunications)
Railroads -- Data processing
Railroad engineering -- Data processing
Hong Kong Polytechnic University -- Dissertations
Department: Faculty of Engineering
Pages: xi, 107 pages : color illustrations ; 30 cm
Language: English
Abstract: Universally launched LTE and evolving LTE-Advanced RAT have tremendously boosted the mobile broadband market in supporting popular IP-based multimedia services. Modular packaging of new technologies enabling customization by Carriers accelerates enhancement of city networks. Similar renovation has not happened in railway communication mainly due to stringent assessment to assure no degrading of the safety critical train control system. Communication based passenger infotainment, security and maintenance aided surveillance together with modern train control system imminently require spectrum efficient railway radio access technology. Currently used HSR GSM-R is expected to be totally replaced in 2025. A high mobility specified LTE-based system incorporated with LTE-Advanced technologies, consisting of dual band networks is proposed for supporting modern high speed train operation and infotainment. Reliable Licensed Band network is used for safety critical train operation data and other high QoS signals such as VoLTE. Non-Licensed Band network adopts the ISM 2.4GHz band with 100MHz bandwidth is proposed for non-safety critical real time infotainment. The modem of either network is expected to offer nominal 200Mbps within 20MHz bandwidth for 500kph high speed train. Such capacity is sufficient for safety critical demand around 100Mbps but multiple modems are expected for the infotainment data traffic beyond 300Mbps. There are technological challenges in achieving such nominal data speed for high speed trains running up to 500kph. The network has to be developed proprietary to railway use with long term technical and financial cooperation from Carriers, Railway Operators and Equipment Suppliers. However, railway obtainable favorable conditions such as predictable train location/speed for enhancing soft handover between cells and comprehensive collection of LTE technologies, and less physical constraints for enhancing uplink design facilitate promising strategies for realizing this proposal.
Access: restricted access

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