4 Architecture to support SBI-based SMS

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

4.1 Architecture to support SBI-based SMS

Figure 4.1-1 shows the non-roaming architecture to support SBI-based SMS.

Figure 4.1-1: Non-roaming System Architecture for SBI-based SMS

Figure 4.1-2a, Figure 4.1-2b Figure 4.1-2c and Figure 4.1-2d depict the non-roaming architecture to support SBI-based SMS, using the reference point representation showing how various network functions interact with each other

Figure 4.1-2a: Non-roaming System Architecture for SBI-based MT SMS in reference point representation

Figure 4.1-2b: Non-roaming System Architecture for SBI-based MO SMS in reference point representation

Figure 4.1-2c: Architecture for SBI-based MSISDN-less MO SMS in reference point representation

Figure 4.1-2d: Architecture for NP staute Retrival from MNPF in reference point representation

NOTE 1: The newly introduced reference points for SMS_SBI are marked in red, and numbered from SM1 to SM14.

4.2 Reference point to support SBI-based SMS

Besides the reference point to support SMS over NAS described in clause 4.4.2.2 of TS 23.501 [3], the following reference points are needed to support SBI-based SMS:

Reference point SM1: Reference point for routing information between SMS-GMSC and UDM.

Reference point SM2: Reference point between SMS-IWMSC and UDM.

Reference point SM3: Reference point for routing information between IP-SM-GW and UDM.

Reference point SM4: Reference point for routing information between SMS Router and UDM.

Reference point SM5: Reference point for SMS message transfer between SMS-GMSC and SMSF.

Reference point SM6: Reference point for SMS message transfer between SMS-GMSC and SMS Router.

Reference point SM7: Reference point for SMS message transfer between SMSF and SMS Router.

Reference point SM8: Reference point for SMS message transfer between SMS-GMSC and IP-SM-GW.

Reference point SM9: Reference point for SMS message transfer between SMSF and IP-SM-GW

Reference point SM10: Reference point for SMS message transfer between SMS-IWMSC and SMSF.

Reference point SM11: Reference point for SMS message transfer between SMS-SC and NEF.

Reference point SM12: Reference point for SMS message transfer between SMS-GMSC and MNPF.

Reference point SM13: Reference point for SMS message transfer between SCP and MNPF.

Reference point SM14: Reference point for SMS message transfer between NRF and MNPF.

4.3 Service based interface to support SBI-based SMS

Besides the service based interfaces to support SMS over NAS described in clause 4.4.2.3 of TS 23.501 [3], the following service based interfaces are needed to support SBI-based SMS.

Nudm: Service-based interface exhibited by UDM

Nnrf: Service-based interface exhibited by NRF

Ngmsc: Service-based interface exhibited by SMS-GMSC

Niwmsc: Service-based interface exhibited by SMS-IWMSC

Nipsmgw: Service-based interface exhibited by IP-SM-GW

Nrouter: Service-based interface exhibited by SMS Router

Nnef: Service-based interface exhibited by NEF

Nmnpf: Service-based interface exhibited by MNPF