5G Access & Registration
This 5G access & registration page groups the main procedures used in this part of the 5G signaling library so you can jump quickly into the right flow for learning, trace reading, or troubleshooting.
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What This Covers
Covers initial access, registration, authentication entry points, service request triggers, and the end-to-end UE to AMF registration sequence in 5G networks.
Common interfaces in this category include N1, N2, NAS signaling.
Use this category page to jump into the main access & registration procedures without scanning the broader 5G call flow library.
Registration Entry Procedures
Procedures that bring the UE into 5GS registration and establish the first valid registration context.
- 5G NR Initial Registration — UE registers with the 5G Core
- Emergency Registration — Registration for emergency services
- Periodic Registration Update — UE refreshes registration timer
- Mobility Registration Update — Registration triggered by mobility
Reachability and Service Restoration
Procedures that move a registered UE back into active service after idle or inactive reachability.
- Service Request — Restore active service for a registered UE
- UE-Initiated Connection for Mobile-Originated Data — UE returns to active service for uplink traffic
- Mobile-Terminated Data / Paging-to-Service Recovery — Downlink-triggered paging through restored active service
Deregistration and Identity Handling
Procedures that remove registration context or correct subscriber identity during registration handling.
- Deregistration Procedure — UE or network deregisters session
- Network Initiated Deregistration — Core network removes UE
- 5G NR Initial Registration — UE registers with the 5G Core