5G Access & Registration
5G access and registration procedures show how a UE enters 5GS service, restores reachability, and removes registration context. Use this hub to jump into initial registration, emergency registration, registration updates, service request, paging, mobile-originated and mobile-terminated data recovery, deregistration, and network-initiated deregistration call flows.
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What This Covers
5G registration procedures create or update the UE registration context used for access, mobility, emergency service, and later PDU session handling.
Service request and paging procedures restore active signaling for registered UEs returning from idle or inactive behavior.
Use the links below to jump directly into registration, service restoration, paging, data recovery, deregistration, and identity-handling call flows.
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