NGOSS is a good support to NGN. Billing subsystem is the key of it.
NGOSS是适应NGN的新一代运营支撑系统，计费子系统是其核心所在。
The service charge system of China Telecom is composed of the subsystem of billing process for local network the provincial and the national production supervision & management center.
本地网电信业务计费帐务系统、省级结算中心与国家电信业务结算系统共同构建中国电信业务结算体系。
Secondly, fundamental 3g technologies, concepts, structure of 3g network and billing system are presented, which are the basis of subsystem design.
第二部分，介绍了3 G技术的基本概念和基本常识，网络结构和计费组件构成。
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