The present document aims to develop high-level use cases and identify the related potential requirements to enable IMS to support new real time communication services. IMS enhancements for the following scenarios are studied in this document:

• one to many communication (e.g. live broadcast video service in a stadium, concert, etc.) with efficient media negotiation;
• interworking for a UE to communicate with non-sip devices (e.g. camera), and delivery of information to control functions of the non-sip devices (e.g. PTZ);
• fast IMS call setup time for Group Communication;
• enhancements on voice & video communications for supporting AR/VR;
• network slicing for IMS;
• service visibility and usage;.
• services using AI (voiceprint) in RTC.

The following documents contain provisions which, through reference in this text, constitute provisions of the present document.

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• For a non-specific reference, the latest version applies. In the case of a reference to a 3GPP document (including a GSM document), a non-specific reference implicitly refers to the latest version of that document in the same Release as the present document.