A real-world visual scene captured by a set of cameras or a camera device with multiple lenses and sensors covering the sphere in all directions around the centre point of the camera set or camera device. The term 360-degree video may be used to include also limited 360-degree video.

A 360-degree video in which the visual scene does not cover the entire sphere around the center point of the camera set or camera device but only a part of it. A limited 360-degree video may be limited i) in the horizontal field to less than 360 degrees, or ii) in the vertical field to less than 180 degrees or iii) in both the vertical and horizontal fields.

Both names refer to the AMR codec (TS 26.071) and are used interchangeably in this specification.

A bitstream that conforms to a video or audio encoding format.

A sequence of bits that forms the representation of one or more coded video or audio sequences.

The Coverage and Handoff Enhancements using Multimedia error robustness feature.

Used for the AMR and AMR-WB codecs to identify one specific bitrate. For example AMR includes 8 codec modes (excluding SID), each of different bitrate.

UE that is (i) operating in radio access capability category series "M" capable of supporting conversational services, and/or (ii) a wearable device which is constrained in size, weight or power consumption (e.g. connected watches), excluding smartphones and feature phones.

A data channel capable MTSI client supporting data channel media as defined in clause 6.2.10.

A DCMTSI client that is implemented in a terminal or UE. The term "DCMTSI client in terminal" is used in this document when entities such as MRFP, MRFC or media gateways are excluded.

A variant of 2-channel stereo encoding where two instances of a mono codec are used to encode a 2-channel stereo signal.

Evolved UTRAN is an evolution of the 3G UMTS radio-access network towards a high-data-rate, low-latency and packet-optimized radio-access network.

The EVS codec includes two operational modes: EVS Primary operational mode ('EVS Primary mode') and EVS AMR-WB Inter-Operable ('EVS AMR-WB IO mode'). When using EVS AMR-WB IO mode the speech frames are bitstream interoperable with the AMR-WB codec (TS 26.190). Frames generated by an EVS AMR-WB IO mode encoder can be decoded by an AMR-WB decoder, without the need for transcoding. Likewise, frames generated by an AMR-WB encoder can be decoded by an EVS AMR-WB IO mode decoder, without the need for transcoding.

Includes 11 bit-rates for fixed-rate or multi-rate operation; 1 average bit-rate for variable bit-rate operation; and 1 bit-rate for SID (TS 26.441). The EVS Primary can encode narrowband, wideband, super-wideband and fullband signals. None of these bit-rates are interoperable with the AMR-WB codec.

Includes 9 codec modes and SID. All are bitstream interoperable with the AMR-WB codec (TS 26.171).

The extent of visible area expressed with vertical and horizontal angles, in degrees in the 3GPP 3DOF reference system as defined in TS 26.118.

Video captured by a wide-angle camera lens that usually captures an approximately hemispherical field of view and projects it as a circular image.

The percentage of speech frames not delivered to the decoder. FLR includes speech frames that are not received in time to be used for decoding.

Audio representation having more than mono (e.g. stereo, multi-channel, object-based audio, scene-based audio, metadata-assisted spatial audio), enabling enhanced experiences compared to mono encoding.

MTSI client supporting the Immersive Teleconferencing and Telepresence for Remote Terminals (ITT4RT) feature, as defined in Annex Y.

ITT4RT client only capable of sending immersive video.

ITT4RT client only capable of receiving immersive video

An ITT4RT client implemented by functionality included in the MRFC and the MRFP.

An ITT4RT client that is implemented in a terminal or UE. The term "ITT4RT client in terminal" is used in this document when entities such as ITT4RT MRF is excluded.

Used for the AMR and AMR-WB codecs to identify the codec modes that can be used in a session. A mode-set can include one or more codec modes.

A multi-stream capable MTSI client supporting multiple streams as defined in Annex S. An MTSI client may support multiple streams, even of the same media type, without being an MSMTSI client. Such an MTSI client may, for example, add a second video to an ongoing video telephony session as shown in Annex A.11. In that case, the MTSI client is an MSMTSI client only if it is fully compliant with Annex S.

An MSMTSI client implemented by functionality included in the MRFC and the MRFP.

An MSMTSI client that is implemented in a terminal or UE. The term "MSMTSI client in terminal" is used in this document when entities such as MRFP, MRFC or media gateways are excluded.

A function in a terminal or in a network entity (e.g. a MRFP) that supports MTSI.

An MTSI client that is implemented in a terminal or UE. The term "MTSI client in terminal" is used in this document when entities such as MRFP, MRFC or media gateways are excluded.

A media gateway that provides interworking between an MTSI client and a non MTSI client, e.g. a CS UE. The term MTSI media gateway is used in a broad sense, as it is outside the scope of the current specification to make the distinction whether certain functionality should be implemented in the MGW or in the MGCF.

A variant of multi-channel encoding where several instances of a mono codec are used to encode a multi-channel signal.

Media such as image or video and its associated audio that enable rendering according to the user's viewing orientation, if consumed with a head-mounted device, or according to user's desired viewport, otherwise, as if the user was in the spot where and when the media was captured.

Used for the EVS codec to distinguish between EVS Primary mode and EVS AMR-WB IO mode.

A piece of visual media, rendered over omnidirectional video or image, or a viewport.

Position and rotation information associated to a viewport.

Provides additional information that may be used for the IVAS media receiver for rendering the audio signal, see TS 26.253.

Picture that has a representation format specified by an omnidirectional video projection format.

Inverse of the process by which the samples of a projected picture are mapped to a set of positions identified by a set of azimuth and elevation coordinates on a unit sphere.

Simultaneously sending different encoded representations (simulcast formats) of a single media source (e.g. originating from a single microphone or camera) in different simulcast streams.

The encoded format used by a single simulcast stream, typically represented by an SDP format and all SDP attributes that apply to that particular SDP format, indicated in RTP by the RTP header payload type field.

The RTP stream carrying a single simulcast format in a simulcast.

Region of omnidirectional image or video suitable for display and viewing by the user.

3 Degrees of freedom

5G Core Network

Alternating Current

Application Layer - Service Data Unit

Adaptive Multi-Rate

Adaptive Multi-Rate - NarrowBand

Adaptive Multi-Rate - WideBand

Adaptive Multi-Rate - WideBand Inter-operable Mode, included in the EVS codec

Access Network Bitrate Recommendation

Access Network Bitrate Recommendation Query

APPlication-defined RTCP packet

Automatic repeat ReQuest

Application Server

Access Transfer Control Function

Access Transfer GateWay

Advanced Video Coding

Binary Floor Control Protocol

Codec Control Messages

Cumulative Distribution Function

Connected Mode DRX

Coverage and Handoff Enhancements using Multimedia error robustness feature

Cube-Map Projection

Codec Mode Request

characters per second

Circuit Switched

Call Session Control Function

Cellular Text telephone Modem

Coordination of Video Orientation

Delay Budget Information

Data Radio Bearer

Discontinuous Reception

Datagram Transport Layer Security

Dual Tone Multi-Frequency

Discontinuous Transmission

Explicit Congestion Notification

ECN Congestion Experienced

ECN Capable Transport

E-UTRAN Node B

EquiRectangular Projection

Evolved UTRAN

Enhanced Voice Services

Far End Camera Control

Full Intra Request

Frame Loss Rate

Facsimile over IP

Field Of View

Generic IP access

Group Of Blocks

Hybrid - ARQ

High Efficiency Video Coding

Head Mounted Display

High Speed Packet Access

Initial Codec Mode

Instantaneous Decoding Refresh

Internet Facsimile Protocol

Internet Facsimile Transfer

IP Multimedia Subsystem

Internet Protocol

Internet Protocol version 4

Intra Random Access Point

Immersive Teleconferencing and Telepresence for Remote Terminals

International Telecommunications Union - Telecommunications

Immersive Voice and Audio Services

Jitter Buffer Management

Media Gateway Control Function

Media GateWay

Multipurpose Internet Mail Extensions

Management Object

Moving Picture Experts Group

Media Resource Function Controller

Media Resource Function Processor

Multi-Stream Multimedia Telephony Service for IMS

Message Session Relay Protocol

Multimedia Telephony Service for IMS

Maximum Transfer Unit

Negative ACKnowledgment

Network-to-Network Interface

Network Time Protocol

Omnidirectional MediA Format

Pulse Code Modulation

Packet Data Convergence Protocol

Packet Data Protocol

Processing Information

Picture Loss Indication

Packet Loss Ratio

Point Of Interconnect

Public Switched Telephone Network

Pan, Tilt, Zoom and Focus

QoS Class Identifier

QoE Measurement Collection

Quality of Experience

Quality of Service

Quantization Parameter

Robust HeaderCompression

Region of Interest

Receiver Report

RTP Control Protocol

Real-time Transport Protocol

Region-Wise Packing

Sub-Band Adaptive Differential PCM

Source Controlled VBR

Stream Control Transmission Protocol

Service Data Adaptation Protocol

Session Description Protocol

SDP Capability Negotiation

Supplemental Enhancement Information

SIlence Descriptor

Session Initiation Protocol

Sender Report

Single Radio Voice Call Continuity

Tandem-Free Operation

Telecoms and Internet converged Services and Protocols for Advanced Network

Temporary Maximum Media Bit-rate Notification

Temporary Maximum Media Bit-rate Request

Transcoder-Free Operation

User Datagram Protocol

Facsimile UDP Transport Layer (protocol)

User Equipment

Viewport Dependent Processing

Voice over IP

Video Object Plane

Virtual Reality

Web Real-Time Communication