Ut服务器建设方案研究

Research on the Construction Solution of Ut Server

在4G网络中,使用VoLTE技术为用户提供语音业务,同时VoLTE用户通过Ut接口与VoLTE AS进行交互,由AS帮助实现补充业务的修改。介绍了Ut服务器的架构、基于Ut服务器的补充业务修改流程以及鉴权认证过程;分析了Ut服务器和VoLTE AS的3种组网方案,并对路由和安全问题进行了探讨;对是否允许VoLTE用户使用USSD方式修改补充业务进行了讨论,并建议只允许VoLTE用户使用Ut接口修改补充业务。

In the 4G network,the operators use VoLTE to provide voice service,and the VoLTE users interact with VoLTE AS server through Ut interface to modify supplementary services,and VoLTE AS server help the users to achieve their goals. It first introduces the architecture of Ut server,the modified process of supplementary services based on Ut server and authentication process. Then,it describes and analyzes three networking solutions between Ut server and VoLTE AS,and has carried on the discussion to the routing and security problems. Finally,it discusses whether to allow VoLTE users to use the USSD method to modify supplementary services,and recommends only to allow VoLTE users to use the Ut interface to modify supplementary services.