scope:

The present document specifies the new capabilities and enhancements needed to support SMS over a generic IP Connectivity Access Network (IP-CAN) using IMS capabilities (TS 23.228 [9]). These include (but are not limited) to:

1 Enhancements to the HSS;

2 Communication between the SMS-GMSC/SMS-IWMSC and the HSS;

3 Authentication of service usage and registration;

4 Transfer of UE Terminated SMS, UE Originated SMS, and Delivery reports;

5 Mechanisms to handle SMS when there is more than one IP connection active with the UE, etc.

The document also specifies the capabilities and enhancements needed to support the service level interworking for the Short Message service as defined in the TS 23.040 [2] and in this specification and the Instant Messaging service as defined in OMA-TS-SIMPLE_IM-V1_0 [12]. The features supported from the IM specification are limited to the exchange of short or large immediate messages in pager mode.

NOTE: The page-mode immediate message as defined in TS 24.247[14] is considered as a subset of OMA-TSSIMPLE- IM-V1_0 [12].

The document also specifies the capabilities and enhancements needed to support service level interworking for the Short Message service, as defined in the TS 23.040 [2] and in this specification and the OMA CPM service as defined in OMA-TS-CPM_Conv_Fnct-V1_0 [17]. The features supported from the CPM specification are the exchange of short or large immediate messages in pager mode, as well as session-based messaging.

The service requirements are described in TS 22.340 [18].