4 Overview

29.5413GPP5G SystemNetwork Exposure (NE) function services for Non-IP Data Delivery (NIDD) and Short Message Services (SMS)Release 18Stage 3TS

4.1 Introduction

Within the 5GC, the NEF offers NIDD services to the NF (e.g. SMF) or the NEF offers MO SMS service to the NF (e.g. SMS-SC) via the Nnef service based southbound interface (see 3GPP TS 23.501 [2], 3GPP TS 23.502 [3] and 3GPP TS 23.540 [18]).

Figure 4.1-1 provides the reference model (in service based interface representation and in reference point representation), with focus on the NEF and the scope of the present specification.

Figure 4.1-1: Reference model – NEF

The functionalities supported by the NEF are listed in clause 6.2.5 of 3GPP TS 23.501 [2].