3GPP 23.501 v20.2.0 — the document's own text
1 Scope
Taught in 1. Who writes this document, and why (The 5G system architecture, in depth), 2. How to read a 3GPP specification (The 5G system architecture, in depth), 1. What this document actually describes (The 5G system architecture, overview), 1. What this document is, and why it had to be written (The 5G system architecture, quick start).
The present document defines the Stage 2 system architecture for the 5G System. The 5G System provides data connectivity and services.
This specification covers both roaming and non-roaming scenarios in all aspects, including interworking between 5GS and EPS, mobility within 5GS, QoS, policy control and charging, authentication and in general 5G System wide features e.g. SMS, Location Services, Emergency Services.
ITUT Recommendation I.130 [11] describes a three-stage method for characterisation of telecommunication services and ITUT Recommendation Q.65 [12] defines Stage 2 of the method.
TS 23.502 [3] contains the stage 2 procedures and flows for 5G System and it is a companion specification to this specification.
TS 23.503 [45] contains the stage 2 Policy Control and Charging architecture for 5G System and it is a companion specification to this specification.