Reviewed semantic catalogue · 2026-09-30. Records with reviewed release bounds are evaluated against Rel-21; unbounded records remain curated orientation metadata rather than guessed release claims. Coverage ↗
Procedure Trace
Follow one operation across the standards stack
curated trace
5G Registration
Rel-15+ · active in Rel-21
UE registration into 5GS across RRC, NAS, NGAP, core procedure and security.
Specification
TS 23.501
5GS architecture
● curated golden set
Working groupSA2
System domainCore
AbstractionStage 2
Release lensRel-21
Status—
Initial release—
Latest version—
Series23
Why read this?
The architectural anchor for 5GS: network functions, reference points, service-based architecture, mobility, sessions, slicing and policy interactions.