System architecture for the 5G System (5GS)

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TS 23.501 Rel-17 defines the Stage 2 system architecture for the 5G System, covering both roaming and non-roaming scenarios. Specific areas addressed include 5GS-EPS interworking, intra-5GS mobility, QoS, policy control and charging, authentication, and system-wide features such as SMS, Location Services, and Emergency Services. It is a companion to TS 23.502 (procedures and flows) and TS 23.503 (Policy Control and Charging architecture). A RAN or core engineer would open this specification when needing authoritative Stage 2 architectural reference — for example, understanding how network functions are defined and interact, how roaming architectures are structured, or how QoS and policy frameworks are positioned within the overall 5GS design. It serves as the foundational architectural baseline before consulting TS 23.502 for detailed call flows or TS 23.503 for charging specifics.

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