4 Overview

29.5773GPP5G SystemIP Short Message Gateway and SMS Router For Short Message ServicesRelease 18Stage 3TS

4.1 Introduction

Within the 5GC, the IP-SM-GW offers services to the UDM or SMS-GMSC via the Nipsmgw service based interface, the SMS Router offers services to the UDM or SMS-GMSC via the Nrouter service based interface (see 3GPP TS 23.540 [14], 3GPP TS 23.501 [2] and 3GPP TS 23.502 [3]).

Figure 4.1-1 and Figure 4.1-2 provide the reference model (in service based interface representation and in reference point representation), with focus on the IP-SM-GW and SMS Router and the scope of the present specification.

Figure 4.1-1: Reference model – IP-SM-GW

Figure 4.1-2: Reference model – SMS Router

The functionalities supported by the IP-SM-GW and SMS Router are listed in 3GPP TS 23.540 [14].