3GPP TSG-T2 SWG3 SMS/EMS ad hoc #2
Rome, Italy
3rd to 5th October 2001	T2E010042 	

Agenda Item:	

Source:	Motorola

Title:	Network Base Solution for EMS Interoperability

Document for:	Discussion

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Introduction
The SMS Technical Realization Standard 23.040 has evolved such that all Information Elements Identifiers (IEI) are not mandatory. Terminals vendors have the option to decide which IEIs they support for the different releases. This elective approach has continued with the EMS based IEIs and causes EMS interoperability problems between 3GPP releases 4 and 5, and also within each release.
There exists the EMS Delivery Request data format within the Extended Object IE. The information conveyed with this EMS Delivery Request can be used to minimize, but not resolve, the interoperability problem of EMS. Currently, the EMS Delivery Request is defined only within the scope of a terminal. The anticipation of this document is to migrate the  terminal based solution for interoperability towards a network based solution using the EMS Delivery Request information.
Solution
Using the EMS Delivery Request (EDR) data format its possible to establish a network based solution to the problem of EMS interoperability. The solution consists of two aspects. First is the establishment of a data base consisting of terminals’ EMS request for delivery of media. And second is an SMSC utilizing this information to ensure a receiving terminal is transmitted appropriate media formats.
An SMSC can request the EDR of a terminal and store the received information in a depository consisting of all SMS terminals. The messaging sequence is shown below.

SMSC

MS

Operator’s Network

EDR Request

EDR Response

With a repository of EDR information, additional processing is required by the SMSC to ensure that a targeted terminal receives appropriate EMS media. In the case when MS1 originates a SM with EMS content and sends it to MS2. 

MS1

MS2

1

Operator’s Network

4

3

SMSC

2

Following is a summary of messaging events as shown in the above diagram.
1.	MS1 sends an SMS message with EMS content to MS2. 
2.	SMSC processes SMS message by looking up the targeted terminal’s EDR information and possibly, reformats the EMS data. 
3.	The SMSC forwards the SMS message with EMS content to the targeted terminal after rendering EMS data.
4.	SMSC transmits a delivery report to originating terminal.

Recommendation
For 3GPP T2 SWG3 to pursue a network based solution for EMS interoperability using the EMS Delivery Request data format contained within the Extended Object IE.