3GPP 23.501 v20.2.0 — the document's own text
5.16.2.1 General
Taught in 21. Emergency calls, messages, voice and location (The 5G system architecture, in depth).
This clause includes feature description for supporting SMS over NAS in 5G System. Support for SMS incurs the following functionality:
- Support for SMS over NAS transport between UE and AMF. This applies to both 3GPP and Non 3GPP accesses.
- Support for AMF determining the SMSF for a given UE.
- Support for subscription checking and actual transmission of MO/MT-SMS transfer by the SMSF.
- Support for MO/MT-SMS transmission for both roaming and non-roaming scenarios.
- Support for selecting proper domains for MT SMS message delivery including initial delivery and re-attempting in other domains.
- Support for MO-SMS transmission to the Emergency Response Centre via SMS-IWMSC/SC in serving PLMN.