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5GC = 5G Core Network

The traditional network is mainly constructed for the communication demands between people and people. With the massive demands of the vertical industriesy ofof Internet of Everything (IoE),  the process architecture of the  binding traditional network binding software with hardware and the solidifying process architecture  between the network entities s can no longer meet suchthe requirements. To address these new business demands, 5G Core network relies on the core idea of Cloud Native, through theuses service-based network ararchitecture (SBA), network resources can be sliced slicing, and CUPScontrol plane and user plane are separated, . Iin combination with cloud technology, to achieve a customized, exposingopen, and service-based network is achieved.
5G core networkCore has been reconstructed to redefine the network entityties in the form of Network Function (NF). Each NF provides functions by independent functions (services) and can be called from each other, thus achieving the transition from a traditional rigid network (fixed functions of network elements, fixed connections between network elements, solidified signaling interactions) to a service-based flexible network.

Figure 1 3GPP Service-based Architecture 

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VoNR (Voice Over New Radio) is the voice target solution of the 5G network. The deployment of the 5G network has multiple options. Therefore, in addition to the VoNR target solution, the 5G voice solution also has such supplementary solutions as EPS Fallback, RAT Fallback and 5G SRVCC to meet the requirements of different network deployment modes and different network development phases. The 3GPP R15 standard has confirmed that the 4G VoLTE voice architecture is still used for 5G voice to provide voice services based on the IMS. The specific voice solution adopted by the operator depends on the actual 5G deployment mode and wireless deployment progress.
ZTE 5G voice solution provides unified access for 2G, 3G, 4G, 5G, WiFi and fixed network users. It supports the convergence of VoNR, VoLTE, VoWiFi, RCS, and FMC, and provides various multimedia service experience such as HD voice, HD video, multi-stream video and eSIM card, thus enhancing the operator's competitiveness in the competition with OTT. At the same time, through the standard API, network capabilities are open to third-party individuals, enterprises, and partners to quickly introduce various Internet applications.

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