Interoperation programme design and performance test on LTE-M integrated bearing system
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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。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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Key words:
- rail transit /
- LTE-M /
- interoperation /
- integrated bearing /
- cross-line operation /
- performance test
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图 1 LTE-M互联互通网元连接方式
Figure 1. Connection method between network elements of LTE-M interoperation
图 2 源PGW故障跨线运营数据流程
Figure 2. Data flow of source PGW failure under cross-line operation
图 3 LTE-M跨核心网切换网络结构和数据流程
Figure 3. Network structure and data flow of LTE-M hand-off between core networks
表 1 综合承载业务优先级与需求
Table 1. Priorities and demands of integrated bearing services
承载业务 上行/ (kb·s-1) 下行/ (kb·s-1) 传输时延/ms 丢包率/% 优先级 每列车CBTC信息 256 256 < 150 1 1 每列车运行状态信息 100 < 300 1 4 每路CCTV业务 2 048 < 300 1 2 PIS业务 4 096 < 300 1 5 紧急文本业务 100 < 300 1 3 合计 4 452 4 452 
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表 2 10 MHz带宽下各业务吞吐量
Table 2. Throughput of each service with 10 MHz bandwidth
Mb·s-1 业务类型 CBTC CCTV (2路) PIS 吞吐量 0.256 2.000 2.000 4.003 吞吐量最小需求 0.256 1.000 1.000 2.000
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表 3 10 MHz带宽下各业务丢包率
Table 3. Packet loss rate of each service with 10 MHz bandwidth
% 业务类型 CBTC CCTV (2路) PIS 上行 下行 丢包率 0.000 0.005 0.000 0.000 0.000
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