5G • Services
Requested NSSAI
Requested Slice Set
Set of S-NSSAIs sent by the UE to the AMF in the Registration Request message.
Technical Explanation
When attaching or updating registration, the UE constructs a Requested NSSAI containing the specific slices needed by currently active applications. The AMF coordinates with NSSF and UDM to evaluate whether the UE is authorized for these slices in its current radio location.
Key Functions
- Transmitted by UE in Registration Request over N1 NAS interface
- Specifies slices requested for current applications (up to 8)
- Evaluated by NSSF against subscription data and local radio availability
Specifications
3GPP TS 23.501, TS 24.501
Interfaces
N1
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