4 Overview

29.5553GPP5G Direct Discovery Name Management Services5G SystemRelease 18Stage 3TS

The 5G Direct Discovery Name Management Function (5G DDNMF) is the network entity in the 5G Core Network (5GC) supporting Direct Discovery Services. Within the 5GC, the 5G DDNMF in HPLMN invokes services provided by the 5G DDNMF in Local PLMN and/or in VPLMN via the N5g-ddnmf service based interface (see 3GPP TS 23.304 [4]).

Figure 4-1 provides the reference model (in service based interface representation and in reference point representation), with focus on the 5G DDNMF:

Figure 4-1: Reference model – 5G DDNMF

The functionalities supported by the 5G DDNMF are listed in clause 4.3.2 of 3GPP TS 23.304 [4].

NOTE: Only service based interfaces between 5G DDNMFs will be covered in this TS, other interfaces won’t be covered for the time being.