Y.1 General

26.1143GPPIP Multimedia Subsystem (IMS)Media handling and interactionMultimedia telephonyRelease 18TS

The MTSI terminal may support the Immersive Teleconferencing and Telepresence for Remote Terminals (ITT4RT) feature as defined in this clause. MTSI clients supporting the ITT4RT feature shall be referred to as ITT4RT clients.

ITT4RT functionality for MTSI enables support of an immersive experience for remote terminals joining teleconferencing and telepresence sessions. It addresses scenarios with two-way audio and one-way immersive 360-degree video, e.g., a remote single user wearing an HMD participating in a conference will send audio and optionally 2D video (e.g., of a presentation, screen sharing and/or a capture of the user itself), but receives stereo or immersive voice/audio and immersive 360-degree video captured by an omnidirectional camera in a conference room connected to a fixed network.

Since immersive 360-degree video support for ITT4RT is unidirectional, ITT4RT clients supporting immersive 360-degree video are further classified into two types to distinguish between the capabilities for sending or receiving immersive video: (i) ITT4RT-Tx client, which is an ITT4RT client only capable of sending immersive 360-degree video, and (ii) ITT4RT-Rx client, which is an ITT4RT client only capable of receiving immersive 360-degree video. Such a classification does not apply for ITT4RT clients supporting immersive speech/audio, since the support for immersive speech/audio is expected to be bi-directional. It should also be noted that a terminal containing ITT4RT-Tx or ITT4RT-Rx client capabilities may also contain further MTSI client capabilities to support bi-directional 2D video.

MTSI gateways supporting ITT4RT functionality are referred to as ITT4RT MRF, which is an ITT4RT client implemented by functionality included in the ITT4RT MRF. An ITT4RT MRF supporting immersive 360-degree video contains both ITT4RT-Tx and ITT4RT-Rx clients.