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.

6 Mechanisms to handle MT-SMS without MSISDN to IMS UE, and SMS between IMS UEs that support MSISDN-less SMS operation.

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-TS-SIMPLE- 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].