3GPP 38.300 v19.3.0 — the document's own text
16.3.2.1 CN-RAN interaction and internal RAN aspects
NG-RAN selects AMF based on a Temp ID or NSSAI provided by the UE over RRC as specified in TS 38.410 [16]. The mechanisms used in the RRC protocol are described in the next clause.
Table 16.3.2.1-1 AMF selection based on Temp ID and NSSAI
| Temp ID | NSSAI | AMF Selection by NG-RAN |
|---|---|---|
| not available or invalid | not available | One of the default AMFs is selected (NOTE) |
| not available or invalid | present | Selects AMF which supports UE requested slices |
| valid | not available, or present | Selects AMF per CN identity information in Temp ID |
| NOTE: The set of default AMFs is configured in the NG-RAN nodes via OAM. |