3 Introduction

This document includes information about NSSF installation in 5G environment.

Network Slice Selection Function (NSSF) selects the network slicing instance (NSI), determines the allowed network slice selection assistance information (NSSAI) and sets AMF to serve the User Equipment (UE). AMF can retrieve NRF, NSI ID, and target AMFs as part of UE initial registration and PDU establishment procedure.

Oracle NSSF interaction with NRF allows retrieving specific NF services to be used for the registration request. It also allows mechanism for registration and subsequent notification Function Instance Discovery.

The NSSF supports the following services:

• Nnssf_NSSelection Service
• Nnssf_NSSAIAvailability Service