System architecture for the 5G System (5GS)
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.
ITU‑T Recommendation I.130 [11] describes a three-stage method for characterisation of telecommunication services and ITU‑T 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.