高速铁路GSM-R网络单点故障模拟测试方法研究

Research on Simulation Test Methods under Single-point BTS Failure Mode of GSM - R Network of High-speed Railway

高速铁路CTCS-3列控系统要求通信GSM-R网络提供实时传递列控信息的无线通道,为保证GSM-R无线系统的可靠性,在工程中均采用单网交织的网络覆盖模式,以满足在某一个站点宕站之后(单点故障)相邻2个基站能够代替故障基站提供服务。在高速铁路投入运营前,需要对GSM-R网络的服务质量进行大量细致的测试,其中一项重要内容即为测试单点故障下GSM-R网络是否能满足QoS指标要求。文章从工程实际出发,分析了目前测试方法的弊端,给出了能最真实反应网络在单点故障下表现的模拟场景,以暴露网络中隐藏的未优化位置,提高网络服务质量。

As a specialty of digital mobile communication system designed for railway, GSM-R can provide voice and data service for railway, and is the transmission plat roof of CTCS - 3 at the same time. In order to ensure the safe operation of trains, intercross base station redundancy single-layer network is used in the project. In this condition, when a single-point BTS fails, the network can continue to work as the two adjacent BTSs work normally. Therefore, detailed and complete GSM - R network optimization that based on the design concept is necessary before the operation of each high-speed railway. One of the most important parts of testing steps is to make sure that the GSM - R network can meet the requirements of QoS metrics under the condition of single-point BTS failure. The shortcomings of the current testing methods are analyzed based on project application. In order to expose hidden imperfect positions, simulation scenarios that can give the most realistic performance of the wireless transmission under the condition of single-point BTS failure are given in this paper, as to improve the quality of network.