What is NGC/NGCN?
NGC/NGCN (Next Generation Core / Next Generation Core Network) refers to the 5G core network that provides services to mobile subscribers through the NG-RAN and serves as the gateway to external data networks. NGCN is an earlier designation used interchangeably with 5GC (5G Core) in the initial phases of 5G standardization. It encompasses all core network functions defined in the 3GPP 5G System architecture, implemented as cloud-native network functions communicating via service-based interfaces.
How Does NGC/NGCN Work?
The NGCN provides the core services required for 5G operation: subscriber authentication (AUSF/UDM), mobility management (AMF), session management (SMF), user data forwarding (UPF), policy enforcement (PCF), network function discovery (NRF), slice selection (NSSF), and external exposure (NEF). The NGCN connects to the NG-RAN via the NG interface and to external data networks via the N6 interface. Unlike the 4G EPC, the NGCN is designed as a collection of loosely coupled microservices that can be independently deployed, scaled, and updated — enabling operators to adopt DevOps practices and continuous delivery for their core network.
Use Cases
5G system core deployment, end-to-end network slicing orchestration, interworking with 4G EPC for NSA-to-SA migration, MEC integration with edge UPF, and exposure of network capabilities to third-party applications via NEF.
3GPP / Standards Reference
3GPP TS 23.501 (System architecture for 5G), 3GPP TS 23.502 (Procedures for 5G System)
Related Terms
NGC | SBA | AMF | Core Network | SA
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This glossary entry is part of the 5GWorldPro Complete 5G Glossary. To go deeper into 5G architecture and technology, explore our 5G Training courses.
