School of Specs 23.501v20.2.0

3GPP 23.501 v20.2.0 — the document's own text

6.2.13 SMSF

Taught in 4. What each network function does (The 5G system architecture, in depth), 2. Who does what in the core (The 5G system architecture, overview).

The SMSF supports the following functionality to support SMS over NAS:

  • SMS management subscription data checking and conducting SMS delivery accordingly.
  • SM-RP/SM-CP with the UE (see TS 24.011 [6]).
  • Relay the SM from UE toward SMS-GMSC/IWMSC/SMS-Router.
  • Relay the SM from SMS-GMSC/IWMSC/SMS-Router toward the UE.
  • SMS charging.
  • Lawful Interception.
  • Interaction with AMF and SMS-GMSC for notification procedure that the UE is unavailable for SMS transfer (i.e. notifies SMS-GMSC to inform UDM when UE is unavailable for SMS).
  • Detection of an emergency number with associated emergency service type in the RP-DA field of the RP-DATA header of the MO-SMS and forwarding the MO-SMS to the SMS-IWMSC/SC in the serving PLMN as specified in clause 4.13.3.3 of TS 23.502 [3].

Editor's note: Detailed handling of the RP-DA description is in TS 23.040 [5].