22.3403GPPIP Multimedia Subsystem (IMS) messagingStage 1TS

In today’s world there are many different types of messaging services available both in the wired and wireless worlds. Some messaging services are supported in both environments; others are only to be found in one. The expectations of the services differ in that some are designed to be used in what is perceived as ‘real’ time, whereas others are designed as a ‘mailbox’ service where the message is stored ready for collection or delivery at a later stage.

The 3GPP Technical Report TR22.940 identifies the issues and needs surrounding messaging solutions related to the 3GPP IP Multimedia Subsystem (IMS) taking into consideration use cases that illustrate the needs of both service providers and users. This Technical Specification takes the Technical Report into account when defining the requirements for the support of IMS Messaging.

IMS Messaging services incorporates one or more of the following messaging types Immediate messaging and Session based messaging. With Immediate messaging the sender expects immediate message delivery in what is perceived as real time. With Session based messaging a communications association is established between two or more users before communication can take place. In the simplest form Session based messaging maybe a direct communication between two users. This specification defines the requirements for both the Immediate message type and the Session based message type.

The specification provides the ability to develop interoperable messaging services that use Immediate and/or Session based message types.