5G • Security
5G-GUTI
5G Globally Unique Temporary Identifier
Temporary identifier assigned by AMF to identify the UE in subsequent signaling, preventing radio tracking.
Technical Explanation
The 5G-GUTI consists of the PLMN ID, AMF Identifier (GUAMI), and a 32-bit 5G-TMSI. The AMF assigns a new 5G-GUTI during initial registration and refreshes it periodically. Using 5G-GUTI instead of SUPI for paging and connection setup prevents third parties from tracking user location.
Key Functions
- Temporary identity allocated by AMF masking the true subscriber identity
- Composed of PLMN ID, AMF Identifier (GUAMI), and 32-bit 5G-TMSI
- Refreshed periodically by the network to prevent location fingerprinting
Specifications
3GPP TS 23.501, TS 24.501
Interfaces
N1
Related 5G Concepts
Want to memorize 5G concepts like this one?
Study it with SuperMemo SM-2 spaced repetition flashcards.