Core Network Architecture Flashcards

What is the function of the SMSF (Short Message Service Function) in Ericsson's 5G core?

Answer: Handles SMS delivery for 5G subscribers via the SBI

The SMSF integrates SMS services into the 5GC by interfacing with the AMF and SMS-SC to deliver text messages to 5G NR subscribers.

In Ericsson's dual-connectivity architecture (EN-DC), what does 'MN' refer to?

Answer: Master Node (typically the 4G eNB)

In EN-DC (E-UTRA-NR Dual Connectivity), the Master Node is the eNB that maintains the primary connection to the EPC and controls bearer split.

What does the term 'SBA' (Service-Based Architecture) mean in the context of Ericsson's 5GC design?

Answer: An architecture where NFs expose capabilities as services via standardized APIs

SBA means each 5GC network function exposes its capabilities through RESTful service interfaces, allowing any authorized NF to consume them via the SBI.

In Ericsson's 5G standalone (SA) architecture, how does the gNB connect to the 5GC?

Answer: Via the N2 (control) and N3 (user plane) interfaces to AMF and UPF respectively

In 5G SA, the gNB uses N2 for control plane signaling to the AMF and N3 for user plane data to the UPF, replacing the 4G S1-MME/S1-U interfaces.

Which Ericsson 5GC component manages the subscriber's consent and data exposure to external applications?

Answer: NEF (Network Exposure Function)

The NEF provides a secure API gateway for third-party applications to access 5GC capabilities and subscriber data, enforcing consent and policy.

What is the main difference between NSA (Non-Standalone) and SA (Standalone) 5G deployment modes?

Answer: NSA relies on 4G LTE as the anchor for control plane; SA uses a native 5G core for all functions

In NSA mode, the 5G NR radio is added while the 4G EPC handles control signaling; in SA mode, the full 5G core (AMF, SMF, UPF, etc.) handles all functions independently.