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首页> 外文期刊>電子情報通信学会技術研究報告. 衛星通信. Satellite Telecommunications >Development of Satellite and Terrestrial Convergence Technology for Internet Services on High-Speed Trains: Service Scenarios
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Development of Satellite and Terrestrial Convergence Technology for Internet Services on High-Speed Trains: Service Scenarios

机译：高速列车上互联网服务的卫星和地面融合技术的开发：服务场景

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摘要

Recently, the demands for the satellite broadband mobile communication services are increased. To provide these services, mobile satellite communication systems for the passengers or crews on the high-speed moving vehicles, are being developed for the last several years especially in the Europe and North America. However, most of these systems can provide only several hundred kbps of transmission rate and this is not enough performance to provide satellite internet service for the group users such as passengers on the high-speed train. Moreover, service availability with these systems is limited to be rather low because they don't have any countermeasure scheme for the N-LOS environment which happens often along the railway. This paper describes mobile broadband satellite communication system, which is on the development, to provide high data-rate internet services to the high-speed trains. This system is applied with the internetworking scenarios of both satellite/terrestrial network and satellite/gap-filler network so that it can provide seamless service even in the train operating environment, and these inter-networking schemes result in high service availability. And this system also has the countermeasure schemes, such as upper layer FEC and antenna diversity, for the short fading which is occurred periodically on the railway due to the power supplying structures so that it can provide high speed internet services. Mobile DVB-S2 technology which is now being standardized in the DVB is used for the forward-link transmission and DVB-RCS for the return-link.
机译：近来，对卫星宽带移动通信服务的需求增加了。为了提供这些服务，最近几年，特别是在欧洲和北美，正在为高速行驶的车辆上的乘客或乘员开发移动卫星通信系统。然而，这些系统中的大多数只能提供几百kbps的传输速率，这还不足以为团体用户（如高速列车上的乘客）提供卫星互联网服务。此外，由于这些系统没有针对铁路沿线经常发生的N-LOS环境的任何对策方案，因此将这些系统的服务可用性限制为相当低。本文介绍了正在开发的移动宽带卫星通信系统，该系统将为高速列车提供高数据速率的互联网服务。该系统既适用于卫星/地面网络又适用于卫星/间隙填充网络的互联工作场景，因此即使在火车运行环境中也可以提供无缝服务，并且这些互联网方案可提供高服务可用性。并且该系统还具有针对方案，例如上层FEC和天线分集，以应对由于供电结构而在铁路上周期性发生的短衰落，从而可以提供高速互联网服务。现已在DVB中标准化的移动DVB-S2技术用于前向链路传输，而DVB-RCS用于返回链路。

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