CBTC应用环境下TD-LTE承载网络的QoS(服务质量)增强措施研究

QoS Guarantee Measurement for TD-LTE Bearer Network in CBTC Application Environment

从减少同频干扰和邻频干扰、增加频谱效率和数据传输速率、提高系统通用性和可靠性等技术优势出发,分析了TD-LTE(分时长期演进)技术应用于CBTC(基于通信的列车自动控制)系统的可行性与必要性。简要介绍了基于TD-LTE承载网络的CBTC系统框架,并分别从控制平面和业务平面对该框架的QoS(服务质量)机制进行了论述。针对CBTC系统的实施提出LTE(长期演进)系统核心网(EPC)冗余、LTE基站冗余与终端设备(CPE)冗余备份等措施,保障TD-LTE承载网络的QoS等级。

Focusing on the technical advantages of the jamming reduction from closed frequencies, the efficiency and date transmitting rate increasing, as well as on the applicability and reliability improvement, the feasibility and necessity of applying TD-LTE technology in CBTC system are analyzed. With a brief introduction of the QoS service architecture in TD-LTE, the QoS mechanism is described from both the controlling layer and the application layer. In order to improve the quality of QoS service, feasible tactics, such as EPC redundancy, LTE base station redundancy and CPE backup and so on are proposed.