Editing My 3GPP 23.501 Notes (section)

=== 5.9.4 5G Globally Unique Temporary Identifier ===
The AMF shall allocate a [[My_3GPP_TS_23.003_notes#Structure_of_the_5G-Short-Temporary_Mobile_Subscriber_Identity_.285G-S-TMSI.29_.C2.A7_2.11|5G Globally Unique Temporary Identifier (5G-GUTI)]] to the UE that is common to both 3GPP and non-3GPP access. It shall be possible to use the same 5G-GUTI for accessing 3GPP access and non-3GPP access security context within the AMF for the given UE. An AMF may re-assign a new 5G-GUTI to the UE at any time. The AMF provides a new 5G-GUTI to the UE under the conditions specified in clause 6.12.3 of TS 33.501. When the UE is in CM-IDLE, the AMF may delay providing the UE with a new 5G-GUTI until the next NAS transaction.

The 5G-GUTI shall be structured as:

<code><5G-GUTI> := <GUAMI> <5G-TMSI></code>

where GUAMI identifies one or more AMF(s).