| NGN is a service driven newtork. Compared with PSTN, IN and PLMN which are driven by network, NGN is used to meet the further demand for multimedia service. Therefore, the operation support system of telecom network needs evolution too,especially the billing system. Otherwise enjoy all kinds of multimedia service can not be operated in real network.Billing system in NGN has to meet more requirements. First of all,it must be compatible forward with existing billing systems in real network.Secondly,it needs to charge multimedia service,which is charged not only by time,volume,but also by Qos,content,service type and so on. Last it needs to evoluate with the speed of the service. In NGN,service can be customized,so is billing system. That is to say,billing system must charge new services as quickly as it can. Besides, customers can customize their bill. In a word,the billing system in NGN needs to react more quickly,more transparently,more flexiblely.In this paper,a billing system in NGN is degined basing on a new call control model in our system,so as to support multimedia service efficiently. This billing system refers to IMS charging architecture,Charging/MMCC/MPCC/GCC CSF in Parlay API and billing function in IN&PSTN.As mentioned before, the points of this billing system lay as follows:1. Charge multiparty and multimedia service flexibly. In the new call control model,there are no binding relationships between call parties and they are independent. So billing system can bill for any party and media. It makes sense for multiparty and multimedia service.2. It can be extended easily to support data service. In NGN,data and integrated services are the key services. According to IMS charging architecture,this billing system has designed interfaces for data service charging,so there is no need for developing again when our system supports data service in the future.Basing on new call control model,this paper design and complete a new billing subsystem of Softswitch system. |
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