杭州地铁4号线TD-LTE网络建设

2014年杭州地铁4号线率先在业内通过轨道交通乘客信息系统(PIS)招标,使用车-地无线通信(TDLTE)技术建设车地无线专网,用以承载PIS视频直播和车载视频监控业务。本文简述该项目的建设情况以及实际测试结果,在网络建设时,正线采用1785~1805 MHz的20 MHz频率进行组网,上下行子帧配比设置为2∶2,并与800 M TETRA数字集群通信系统共用漏缆。经过测试,各项指标符合设计要求,完全可以满足PIS业务承载需求。2015年7月,杭州地铁首次在全国范围内完成了基于已开通运营线路的轨道交通车辆综合通信系统(LTE-M)综合业务承载测试。通过测试验证3、5、10 MHz以及15 MHz等多个不同频宽下的业务承载能力,为杭州地铁后续线路列车自动控制(CBTC)系统业务的承载提供参考依据。

Constructing TD-LTE Network for Hangzhou Metro Line 4

The TD-LTE technology was employed in the wireless private network of Line 4 of Hangzhou Metro to provide PIS and CCTV services in 2014.The construction process and the application effects of the LTE system are elaborated.The upper and lower sub-frame ratio of the network was set to 2:2,which shared the leaky cable with the 800M TETRA digital trunking communication system.Tests indicated that the indicators conform to the design requirements and could fully meet the needs of PIS services.In July,2015,Hangzhou Metro completed the LTE-M integrated service load test based on the routes in operation for the first time across the country.The test verified the service bearing capacity under different frequency widths (3,5,10 MHz and 15 MHz) and provided the references in terms of the LTE technology bearing CBTC for Hangzhou Metro.