sms5g

Application to Person Messaging via Custom SMS Gateway in 5G

I am researching about implementing an SMS gateway that supports sending Application to Person (A2P) SMSs (in both MO and MT directions) over a 5G network. It is something similar to an ESME (External Short Messaging Entity), which talks directly to the SMSC on 2G/3G networks.

Overview of the SMS gateway to be developed in the context of the 5G network and third-party applications.

As illustrated in the above diagram it should be able to forward SMS AOMT received from the third-party application to the 5G Network as well as to forward SMS MOAT received from the 5G network to the third-party application.

To implement the above functionality for SMS over NAS (SMSoNAS) I want to understand,

  1. Where this SMS gateway fits in the 5G Network architecture? (i.e. Should I implement an SMSF / a component similar to AMF which provides only uplink functions / an MSGin5G server / MSGF ?)

Should I consider the SMS gateway to be an NF consuming the SMSF?

Figure 9 SMS over 5G interfaces (MAP/Diameter) from GSMA SMS Evolution

Or should I consider the SMS gateway to be an MSGF?

Figure A-2: MSGin5G System Architecture for non-roaming from 3GPP_TR_23.700-24_v0.6.2

  1. Which components should the SMS gateway talk to? (i.e. SMSF / UDM / SMSC)
  2. Which protocols should the SMS gateway implement? (i.e. SS7-MAP / Diameter / Rest-Based N20/Nsmsf)

I have refered several 3GPP and ETSI 5G specifications including ETSI_TS_129.540, 3GPP_TS_23.502, 3GPP_TS_22.262 and yet was not able to find any answer to above points.

So can you please help me to understand the correct architecture for my SMS gateway

Solution

  • In the 5G ecosystem, SMSF will be your SMS Gateway to connect conventional SMSC to 5G network. SMSC still stores and forwards SMS in its legacy network. SMSF will connect to SMSC through SGd interface. SMSF also connects 5G control plane network functions; AMF and UDM. Using service-based interface SMSF provides SMS MO/MT services based on the SMS over NAS through AMF.

    Abbreviations used ;