5G • Core Network
Initial Registration
5GS Initial Registration Procedure
The power-on attach procedure establishing user identity, authentication, and core registration.
Technical Explanation
When powered on, the UE transmits an Registration Request over N1 containing its encrypted SUCI. The AMF coordinates with AUSF/UDM to authenticate the subscriber via 5G-AKA, activates NAS ciphering and integrity protection, downloads authorized subscription profiles from UDM, and assigns a 5G-GUTI.
Key Functions
- Power-on attachment procedure establishing 5G cellular connectivity
- Authenticates subscriber and activates NAS security encryption
- Assigns temporary 5G-GUTI and downloads authorized network slice profiles
Specifications
3GPP TS 23.502, TS 24.501
Interfaces
N1N2
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