朔黄重载铁路TD-LTE系统QoS评价标准研究

Research on QoS Evaluation Standard of TD-LTE System of Shuohuang Heavy Haul Railways

朔黄铁路LTE宽带移动通信系统是一个只有PS域的IP数据移动承载网络,在对QoS的评价方法上与GSM-R存在诸多不同之处。朔黄铁路LTE系统是全球第一个承载铁路安全业务和非安全业务的LTE系统,缺乏一个完整的QoS标准来评价系统的质量。文章建立了分层模型,将重载铁路LTE系统分为应用业务系统、LTE移动承载网、有线传输承载网三层,根据三个分层的不同特点,基于3GPP、ITU-T等规范标准,合理分配各层指标,确定了适合重载铁路的LTE系统QoS评价体系。评价体系包括网络覆盖指标、网络不同业务的QoS指标、网络基本性能指标、LTE网络QoS指标要求、应用业务系统指标等内容。经过朔黄铁路LTE工程的验证,证明本评价指标研究结果适应重载铁路业务需求,可以作为重载铁路LTE系统的评价标准。

Shuohuang Railway LTE broadband mobile communication system is an IP data mobile bearer network with only PS domain. It has a lot of differences from GSM-R in evaluating methods of QoS. Shuohuang LTE system is the first LTE system worldwide bearing safety and non-safety businesses of railway. There has been no established QoS criterion to evaluate the quality of this system. A hierarchical model is built in the study to determine a QoS evaluating criteria of LTE system of heavy haul railway. The model is based on the standards including 3 GPP and ITU-T. It divided the LTE system of Heavy haul railway into three layers according to their individual characteristics,i. e. application service system,LTE mobile bearer network,wired transmission bearer network. The indexes utilized in the evaluating system include network coverage,Qos metrics of different network services,basic performance index of network,QoS metrics of LTE network,indexes of application service system etc. The results has already been verified by the LTE project along Shuohuang railway. This system is able to meet business requirements of heavy haul railway,and can be the evaluating criteria of the LTE system of heavy haul railway.