| LTE-M综合承载系统互联互通方案设计和性能测试 |
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| 引用本文： | 赵红礼,曹源,朱烨.LTE-M综合承载系统互联互通方案设计和性能测试[J].交通运输工程学报,2019,19(1):161-171. |
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| 作者姓名： | 赵红礼 曹源 朱烨 |
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| 作者单位： | 北京交通大学 轨道交通运行控制系统国家工程研究中心，北京 100044 |
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| 基金项目： | 国家重点基础研究发展计划项目2018YFB1201601 |
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| 摘 要： | 针对目前城市轨道交通中采用商用公网长期演进(LTE) 系统承载时, 跨核心网互联互通的可靠性和实时性不满足业务需求的问题, 分析了城市轨道交通长期演进(LTE-M) 综合承载系统的业务需求, 提出了LTE-M综合承载系统互操作性需求和数据业务的互联互通需求, 研究了LTE-M综合承载系统互联互通的工作机制, 设计了可靠性保障方法, 包括核心网间路由重建立、核心网间故障倒切、核心网板卡倒切等, 提出了LTE-M综合承载系统互联互通的系统架构; 在实验室搭建了LTE-M综合承载系统互联互通测试环境, 分析了信令和数据, 以验证其是否满足应用需求, 并进行了LTE-M综合承载系统跨核心网切换测试、跨核心网路由测试、核心网故障倒切测试、可靠性测试和互联互通性能测试。研究结果表明: 为满足城市轨道交通列车跨线运营需求, 需实现LTE-M终端和基站之间参考点、核心网服务网关与分组数据网关之间参考点、移动管理实体之间参考点以及归属签约用户服务器与移动管理实体之间参考点接口的互联互通; LTE-M综合承载系统互联互通跨核心网切换时间小于1 s, 核心网间路由重建立时间小于1 s, 核心网单板故障倒切时间小于2 s, 跨核心网故障倒切时间小于31 s; LTE-M综合承载系统互联互通业务传输时延小于0.15 s, 丢包率小于1%;10 MHz带宽能同时传输1路100 kb·s-1的基于通信的列车运行控制业务、2路2 Mb·s-1的车辆视频监控业务和1路4 Mb·s-1的乘客信息系统业务。可见, LTE-M综合承载系统互联互通性能满足城市轨道交通跨线运营的业务需求。
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| 关 键 词： | 轨道交通 LTE-M 互联互通 综合承载 跨线运营 性能测试 |
| 收稿时间： | 2018-08-11 |
Interoperation programme design and performance test on LTE-M integrated bearing system |
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| ZHAO Hong-li,CAO Yuan,ZHU Ye.Interoperation programme design and performance test on LTE-M integrated bearing system[J].Journal of Traffic and Transportation Engineering,2019,19(1):161-171. |
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| Authors: | ZHAO Hong-li CAO Yuan ZHU Ye |
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| Affiliation: | National Engineering Research Center of Rail Transportation Operation and Control System, Beijing Jiaotong University, Beijing 100044, China |
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| Abstract: | For the problem that when the commercial public network of long term evolution (LTE) was used to bear the urban rail transit, the reliability and real-time performance of interoperation crossing core network could not meet the service demands, the service demands of long term evolution for the metro (LTE-M) integrated bearing system were analyzed. The demands of interoperability and the data service connectivity of LTE-M integrated bearing system were put forward. The connectivity operating mechanism of LTE-M integrated bearing system was studied. The method of reliability assurance was designed, including the route reestablishment and failure switch between core networks, and the single plate switch of core network. The interoperation system architecture of LTE-M integrated bearing system was presented. The interoperation test environment for LTE-M integrated bearing system was established in laboratory. The signaling and data were analyzed to verify whether the system meet the application requirements. The hand-off test and route test between core networks, failure switch test of core network, reliability test and interoperability performance test on LTE-M integrated bearing system were conducted. Research result shows that to meet the demands of urban rail trains operating cross-line, it should realize the interoperations among the reference points between LTE-M terminal and base station, between the serving gateway of core network and packet data network gateway, between mobility management entities, and between home subscriber server and mobility management entity. The hand-off time between core networks of LTE-M integrated bearing system is less than 1 s, the route reestablishment time between core networks is less than 1 s, the failure switch time of single plate of core network is less than 2 s, and the failure switch time between core networks is less than 31 s. The transmission delay for LTE-M integrated bearing system interoperability service is less than 0.15 s, and the packet loss rate is less than 1%. When the LTE-M integrated bearing system works at a 10 MHz bandwidth, it can simultaneously transmit one path 100 kb·s-1 communication based train control service, two path 2 Mb·s-1 closing circuit TV service and one path 4 Mb·s-1 passenger information system service. Thus, the interoperation performance of LTE-M integrated bearing system can meet the service demands for the cross-line operation of urban rail transit. |
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