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. https://www.ericsson.com/en/blog/2019/2/your-quick-guide-to-network-functions-in-5g-core
blog article
YOUR QUICK GUIDE TO NETWORK FUNCTIONS IN 5G CORE
3GPP has ended up in a potentially complex situation, where we now have two network architectures on the table. Consequently, depending on how communication service providers deploy their radio networks, which technology they use for coverage band, and which technology they use for capacity bands, they may end up with different core network solutions. The major difference with 5GC compared to EPC is that 5GC’s control plane (CP) functions interact in a Service-Based Architecture (SBA).  A key Network Function (NF) of SBA is the Network Repository Function (NRF), which provides NF service registration and discovery, enabling NFs to identify appropriate services in one another. SBA principles apply to interfaces between CP functions within 5GC only, so interfaces toward Radio Access Network (RAN), user equipment or user plane (UP) functions (N1, N2, N3, N4, N6 and N9) are excluded. READ MORE