LTE网络S1接口流量监测技术的研究与实现

为了实现对长期演进(long term evolution，LTE)网络的流量监测，对S1接口用户面协议栈和应用层协议进行了分析，利用模块化设计思想实现了对S1接口应用层协议的全面监测。针对传统信令监测系统数据业务识别度低、统计能力不强的问题，在传统的监测系统基础上，应用深度包检测（deep packet inspection，DPI）技术对应用层业务进行精细化识别, 并设计了基于传输流的业务呼叫/事务详细记录(call/transaction detail record，xDR)合成方法，实现了对业务流量的精确监测。经现网测试验证，所设计的基于深度包检测技术的业务识别方案和基于传输流的呼叫/事务详细记录合成方案达到了预期的效果，在移动通信网络业务流量监测领域具有推广意义。

Research and implementation of traffic monitoring technology on S1 interface in LTE network

In order to monitor the traffic on S1 interface in LTE(long term evolution) network, this paper analyses the user plane protocol stack and the application layer protocol of S1 interface and outlines modularization design concept in monitoring the protocol on the user plane of S1 interface. Aiming at weak identification of data services and poor statistical ability in traditional monitoring system, DPI(deep packet inspection) technique applies to services identification on the application layer, then the services call/transaction detail record (xDR) synthesis method based on the transport stream is proposed, which has better performance than traditional monitoring system. The services identification based on DPI technique and the xDR synthesis method based on the transport stream work effectively by the real network testing and have important significance for traffic monitoring in mobile communication network.