5G Mobility Procedures
5G mobility procedures show how service continuity is maintained as a UE moves between cells, gNBs, AMF service areas, radio technologies, and dual-connectivity contexts. Use this hub to jump into intra-gNB handover, Xn handover, N2 handover, inter-AMF mobility, inter-RAT handover, LTE-to-5G redirection, EPS fallback, PSCell change, dual-connectivity mobility, and RRC inactive resume call flows.
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What This Covers
5G mobility call flows keep registration, radio context, and session continuity aligned as the UE moves.
Handover and interworking paths may use Xn, N2, inter-AMF signaling, inter-RAT handling, EPS fallback, or dual-connectivity reconfiguration.
Use the links below to jump directly into intra-NR mobility, interworking, fallback, dual-connectivity, inactive resume, and recovery call flows.
Intra-NR Mobility
Procedures that keep the UE inside NR while moving between cells, gNBs, or AMF service areas.
- Intra-gNB Handover — Handover between cells under the same gNB
- Inter-gNB Handover — Handover between base stations
- Connected Mode Handover — UE moves between cells
- Inter-AMF Mobility — UE moves between AMF regions
Interworking and Fallback Mobility
Procedures that bridge 5G mobility into LTE or reuse LTE service when native NR continuity is not enough.
- Inter-RAT Handover — 5G to LTE mobility
- LTE to 5G Inter-RAT Handover / Redirection — Return path from LTE toward 5G access
- EPS Fallback Procedure — 5G voice continuity fallback toward LTE
Advanced Mobility Variants
Specialized mobility procedures that cover dual connectivity, inactive-state resume, and non-basic handover branches.
- PSCell / Secondary Cell Change in EN-DC or MR-DC — Dual-connectivity cell-change procedure
- Dual Connectivity Mobility Reconfiguration — Mobility-related multi-node radio reconfiguration
- RRC Inactive Resume with Mobility Context Change — Resume path when mobility changed while inactive