Phase 2 System Architecture and Functionality
Abstract
The Standalone (SA) 5G network uses Service-Based Architecture (SBA). This means that the network presents the feasible network elements as Network Functions (NFs). This chapter presents the 5G architecture with some of the most relevant scenarios in roaming and non-roaming environments. It also presents Release 15 and Release 16 5G architecture with new and reutilized elements, connected and cooperative networks, aggregated services, and key functions of evolved networks. The 5G system allows DC within the native 5G network, or relies on MR access technologies as defined in Release 16 3GPP TS 37.340 V16.2.0. The 5G network architecture can be described by using reference point representation or service-based interface representation. The new terminology for the 5G core network is 5GC, whereas the NR system is referred to as NG-RAN. As 3GPP TS 23.501 states, IMS support for 5GC is defined in 3GPP TS 23.228.
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