Impact of Doppler Shift on LTE System in High Speed Train Scenario
Single Frequency Network (SFN) is considered as a vital deployment method in High Speed Train (HST) scenario. HST channel model is of much importance to LTE performance assessment. And SFN channel models are non-stationary. Since the train moves fast, the
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State Key Laboratory of Rail Traffic Control and Safety, Beijing Jiaotong University, Beijing 100044, China [email protected] Beijing Xinwei Telecom Technology Group Co., Ltd, Beijing 100094, China
Abstract. Single Frequency Network (SFN) is considered as a vital deployment method in High Speed Train (HST) scenario. HST channel model is of much importance to LTE performance assessment. And SFN channel models are non-stationary. Since the train moves fast, the impact of Doppler rises significantly. The consideration of the effect of Doppler shift in SFN scenario is of much difference from in traditional stationary channels. In this paper, we build a link level simulation system and evaluate the performance of TD-LTE system with single-tap and two-tap SFN High Speed Train (HST) channel models without frequency compensation. The results show that when the Doppler shift exceeds 1000 Hz, the performance degrades much more obviously. Additionally, the absolute value of Doppler shift has great influence on TD-LTE system and the impact of Doppler shift variation on the system performance is not obvious. This paper provides reference for the design of next generation railway mobile communication system and lay a foundation for the LTE high-speed adaptability research. Keywords: LTE model
Doppler shift
Performance evaluation
SFN channel
1 Introduction In recent years, the high-speed railway achieves good development, especially in China. Long Term Evolution (LTE) has the characteristics of high spectral efficiency, high peak data rates, as well as flexibility in frequency and bandwidth [1]. So, it is a key problem for LTE to meet the performance requirement of passengers in high speed railway. Many companies have proposed possible high-speed railway scenarios in the 3GPP RAN4 meeting recently, including scenario 1, scenario 2 (scenario 2a to 2g), scenario 3 and scenario 4. And it is explicitly proposed to investigate scenario 1, scenario 2d and the first hop of scenario 2c, namely: open space SFN scenario, SFN scenario in tunnel and leaky cable scenario in tunnel [2]. To avoid frequent handover in HST scenario, multiple Remote Radio Heads (RRHs) are connected with one BBU by fiber, and share the same cell ID. That is to say, one cell contains multiple RRHs, and UE receives the same signal from multiple RRHs, thus forming the open space SFN scenario which is an important solution in © ICST Institute for Computer Sciences, Social Informatics and Telecommunications Engineering 2018 Q. Chen et al. (Eds.): ChinaCom 2016, Part II, LNICST 210, pp. 431–440, 2018. DOI: 10.1007/978-3-319-66628-0_41
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high-speed railway communication. Many companies have been devoting to evaluate the performance basing on LTE-FDD system. And three candidate solutions are proposed in the RAN 4 #77 meeting, which are respectively UE receiver enhancement, eNodeB frequency pre-compensation and unidirectional SFN arrangement. But for all of the solutions, the Doppler shift caused by high-speed movement will be a key impact
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