5.1.1 General

23.5403GPP5G System: Technical realization of Service Based Short Message ServiceRelease 17Stage 2TS

The procedure is used to support the Mobile Terminated short message transfer for SBI-based interfaces as defined in clause 4.1, which is based on Short message mobile terminated procedure defined in clause 10.1 of 3GPP TS 23.040 [2] and clauses 4.13.3.6, 4.13.3.7 and 4.13.3.8 of 3GPP TS 23.502 [4].

This new services introduced in this procedure can be registered in NRF, and discovered by NF service consumers.

SMSF/SMS Router/IP-SM-GW should indicate whether it supports SMS_SBI or not. For the case of SMSF/IP-SM-GW, "SBI support indication" should be brought when SMSF/IP-SM-GW registers in UDM. For the case of SMS Router, "SBI support indication" should be configured locally in UDM, together with the SMS Router address. UDM stores the "SBI support indication" indication and provides it to the SMS-GMSC during Routing Info retrieval. SMS-GMSC selects legacy or SBI based protocol based on the indication received during Routing Info retrieval.