6.10 Service-level interworking: Status Report procedure for Instant Message to Short Message interworking

23.2043GPPRelease 17Stage 2Support of Short Message Service (SMS) over generic 3GPP Internet Protocol (IP) accessTS

Figure 6.10: Status report procedure for Instant Message to Short Message interworking

1) An Instant Message from the UE is successfully delivered to the SMS user after service-level interworking. The original Instant Message requested a Disposition Notification.

NOTE 1: A Disposition Notification can be requested in the message sent by the UE in step 1 as described in IETF IMDN draft-ietf-simple-imdn [13]. If the requested Disposition Notification by the IM user is a request for a read notification, the IP-SM-GW ignores the request.

2) The SMS-SC sends a Status report to the SMS-GMSC.

NOTE 2: The Status report will, from the SMS-GMSC’s point of view be treated as any SM termination.

NOTE 3: The Status report is an optional message.

3a) The SMS GMSC interrogates the HLR/HSS to retrieve routeing information. Based on the pre-configured IP-SM-GW address for the user, the HLR/HSS forwards the request to the corresponding IP-SM-GW.

3b) The HLR/HSS returns the IMSI and the address(es) of the current MSC, SGSN, MME and/or SMSF to the IP-SM-GW for delivery of the Short Message in CS/PS domain.

3c) The IP-SM-GW creates a MT Correlation ID as per TS 23.040 [2], which associates the Routing Info retrieval with the subsequent Forward Short Message messages(s), and stores this along with the IMSI of the receiving subscriber. The IP-SM-GW returns to the SMS-GMSC the address of itself, along with the MT Correlation ID in the IMSI field, as routeing information. Alternatively, the IP-SM-GW may return the address(es) of the current MSC, SGSN, MME and/or SMSF, in which case, the subsequent procedure to forward the message is the same as defined in TS 23.040 [2].

4) The SMS-GMSC sends the status report in the Forward Short Message to the IP-SM-GW.

NOTE 4: Steps 5 to 11 only occur if the original IM requested a delivery notification in the Disposition Notification.

5) The IP-SM-GW translates and maps the Status report in the Forward Short Message into an Instant Message carrying a Delivery Notification as described in the IETF IMDN draft-ietf-simple-imdn [13]. The IP‑SM‑GW should keep the message id for a message for which IMDN was requested so it can send the message id to the UE in the IMDN.

6-7) The IP-SM-GW sends a Delivery Notification within an Instant Message to the S-CSCF, which sends the Instant Message to the UE.

8-9) The UE acknowledges receipt of the Instant Message containing the Delivery Notification to the S-CSCF. The S‑CSCF sends the acknowledgment to the IP-SM-GW.

10) The IP-SM-GW sends a Delivery report (SMS-DELIVER-REPORT) to the SMS-GMSC.

11) The SMS-GMSC sends an acknowledgement back to the SMS-SC.