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Study on the Online Charging System in B5G Era

Reference to the 5G network specifications defined by 3GPP, the online charging system has been greatly added and modified both in terms of interface and architecture. Since traditional online charging systems are mostly closed systems, a small number of open-source projects are no longer maintained, which makes the research in recent years extremely lacking in a suitable simulation environment. It encourages the emergence of free5GC project, which is the world's first 5G core network, developed by Taiwan independently and adopting the Apache 2.0 open-source specification. In this research, we try to implement the network function of the online charging system under the free5GC architecture and integrate it with third-party public cloud services. Adopting cloud computing, we focus on improving Charging Data Record (CDR) in computing and storage to compose a highly available and reliable B5G/6G charging system.