School of Specs 23.501v20.2.0

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

5.16.3.8.2 Access Selection for SMS over NAS

Taught in 21. Emergency calls, messages, voice and location (The 5G system architecture, in depth).

It should be possible to provision UEs with the HPLMN SMS over NAS operator preferences on access selection for delivering SMS over NAS signalling.

Based on the SMS over NAS preference:

    • SMS is preferred to be invoked over 3GPP access for NAS transport: the UE attempts to deliver MO SMS over NAS via 3GPP access if the UE is both registered in 3GPP access and non-3GPP access.
    • SMS is preferred to be invoked over non-3GPP access for NAS transport: the UE attempts to deliver MO SMS over NAS via non-3GPP access if the UE is both registered in 3GPP access and non-3GPP access. If delivery of SMS over NAS via non-3GPP access is not available, the UE attempts to deliver SMS over NAS via 3GPP access.