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Content for  TS 26.114  Word version:  17.2.0

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3  Definitions and abbreviationsWord‑p. 25

3.1  Definitions

For the purposes of the present document, the terms and definitions given in TR 21.905 and the following apply:
360-degree video:
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.
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.
AMR, AMR-NB:
Both names refer to the AMR codec (TS 26.071) and are used interchangeably in this specification.
Bitstream:
A bitstream that conforms to a video or audio encoding format.
bitstream:
A sequence of bits that forms the representation of one or more coded video or audio sequences.
CHEM:
The Coverage and Handoff Enhancements using Multimedia error robustness feature.
Codec mode:
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.
Constrained terminal:
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.
DCMTSI client:
A data channel capable MTSI client supporting data channel media as defined in clause 6.2.10.
DCMTSI client in terminal:
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.
Dual-mono:
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:
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.
EVS codec:
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 [18]. 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.
EVS Primary mode:
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.
EVS AMR-WB IO mode:
Includes 9 codec modes and SID. All are bitstream interoperable with the AMR-WB codec (TS 26.171).
Field of View:
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.
Fisheye Video:
Video captured by a wide-angle camera lens that usually captures an approximately hemispherical field of view and projects it as a circular image.
Frame Loss Rate (FLR):
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.
ITT4RT client:
MTSI client supporting the Immersive Teleconferencing and Telepresence for Remote Terminals (ITT4RT) feature, as defined in Annex X.
ITT4RT-Tx client:
ITT4RT client only capable of sending immersive video.
ITT4RT-Rx client:
ITT4RT client only capable of receiving immersive video
ITT4RT MRF:
An ITT4RT client implemented by functionality included in the MRFC and the MRFP.
ITT4RT client in terminal:
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.Mode-set: 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.
MSMTSI client:
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.
MSMTSI MRF:
An MSMTSI client implemented by functionality included in the MRFC and the MRFP.
MSMTSI client in terminal:
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.
MTSI client:
A function in a terminal or in a network entity (e.g. a MRFP) that supports MTSI.
MTSI client in terminal:
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.
MTSI media gateway (or MTSI MGW):
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.
Omnidirectional media:
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.
Operational mode:
Used for the EVS codec to distinguish between EVS Primary mode and EVS AMR-WB IO mode.
Overlay:
A piece of visual media, rendered over omnidirectional video or image, or a viewport.
Pose:
Position and rotation information associated to a viewport.
Projected picture:
Picture that has a representation format specified by an omnidirectional video projection format.
Projection:
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.
Simulcast:
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.
Simulcast format:
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.
Simulcast stream:
The RTP stream carrying a single simulcast format in a simulcast.
Viewport:
Region of omnidirectional image or video suitable for display and viewing by the user.
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3.2  AbbreviationsWord‑p. 27

For the purposes of the present document, the abbreviations given in TR 21.905 and the following apply:
3DOF
3 Degrees of freedom
5GC
5G Core Network
AC
Alternating Current
AL-SDU
Application Layer - Service Data Unit
AMR
Adaptive Multi-Rate
AMR-NB
Adaptive Multi-Rate - NarrowBand
AMR-WB
Adaptive Multi-Rate - WideBand
AMR-WB IO
Adaptive Multi-Rate - WideBand Inter-operable Mode, included in the EVS codec
ANBR
Access Network Bitrate Recommendation
ANBRQ
Access Network Bitrate Recommendation Query
APP
APPlication-defined RTCP packet
ARQ
Automatic repeat ReQuest
AS
Application Server
ATCF
Access Transfer Control Function
ATGW
Access Transfer GateWay
AVC
Advanced Video Coding
BFCP
Binary Floor Control Protocol
CCM
Codec Control Messages
CDF
Cumulative Distribution Function
cDRX
Connected Mode DRX
CHEM
Coverage and Handoff Enhancements using Multimedia error robustness feature
CMP
Cube-Map Projection
CMR
Codec Mode Request
cps
characters per second
CS
Circuit Switched
CSCF
Call Session Control Function
CTM
Cellular Text telephone Modem
CVO
Coordination of Video Orientation
DBI
Delay Budget Information
DRB
Data Radio Bearer
DRX
Discontinuous Reception
DTLS
Datagram Transport Layer Security
DTMF
Dual Tone Multi-Frequency
DTX
Discontinuous Transmission
ECN
Explicit Congestion Notification
ECN-CE
ECN Congestion Experienced
ECT
ECN Capable Transport
eNodeB
E-UTRAN Node B
ERP
EquiRectangular Projection
E-UTRAN
Evolved UTRAN
EVS
Enhanced Voice Services
FECC
Far End Camera Control
FIR
Full Intra Request
FLR
Frame Loss Rate
FoIP
Facsimile over IP
FOV
Field Of View
GIP
Generic IP access
GOB
Group Of Blocks
H-ARQ
Hybrid - ARQ
HEVC
High Efficiency Video Coding
HMD
Head Mounted Display
HSPA
High Speed Packet Access
ICM
Initial Codec Mode
IDR
Instantaneous Decoding Refresh
IFP
Internet Facsimile Protocol
IFT
Internet Facsimile Transfer
IMS
IP Multimedia Subsystem
IP
Internet Protocol
IPv4
Internet Protocol version 4
IRAP
Intra Random Access Point
ITT4RT
Immersive Teleconferencing and Telepresence for Remote Terminals
ITU-T
International Telecommunications Union - Telecommunications
JBM
Jitter Buffer Management
MGCF
Media Gateway Control Function
MGW
Media GateWay
MIME
Multipurpose Internet Mail Extensions
MO
Management Object
MPEG
Moving Picture Experts Group
MRFC
Media Resource Function Controller
MRFP
Media Resource Function Processor
MSMTSI
Multi-Stream Multimedia Telephony Service for IMS
MSRP
Message Session Relay Protocol
MTSI
Multimedia Telephony Service for IMS
MTU
Maximum Transfer Unit
NACK
Negative ACKnowledgment
NNI
Network-to-Network Interface
NTP
Network Time Protocol
OMAF
Omnidirectional MediA Format
PCM
Pulse Code Modulation
PDCP
Packet Data Convergence Protocol
PDP
Packet Data Protocol
PLI
Picture Loss Indication
PLR
Packet Loss Ratio
POI
Point Of Interconnect
PSTN
Public Switched Telephone Network
PTZF
Pan, Tilt, Zoom and Focus
QCI
QoS Class Identifier
QMC
QoE Measurement Collection
QoE
Quality of Experience
QoS
Quality of Service
QP
Quantization Parameter
RoHC
Robust HeaderCompression
ROI
Region of Interest
RR
Receiver Report
RTCP
RTP Control Protocol
RTP
Real-time Transport Protocol
RWP
Region-Wise Packing
SB-ADPCM
Sub-Band Adaptive Differential PCM
SC-VBR
Source Controlled VBR
SCTP
Stream Control Transmission Protocol
SDAP
Service Data Adaptation Protocol
SDP
Session Description Protocol
SDPCapNeg
SDP Capability Negotiation
SEI
Supplemental Enhancement Information
SID
SIlence Descriptor
SIP
Session Initiation Protocol
SR
Sender Report
SRVCC
Single Radio Voice Call Continuity
TFO
Tandem-Free Operation
TISPAN
Telecoms and Internet converged Services and Protocols for Advanced Network
TMMBN
Temporary Maximum Media Bit-rate Notification
TMMBR
Temporary Maximum Media Bit-rate Request
TrFO
Transcoder-Free Operation
UDP
User Datagram Protocol
UDPTL
Facsimile UDP Transport Layer (protocol)
UE
User Equipment
VDP
Viewport Dependent Processing
VoIP
Voice over IP
VOP
Video Object Plane
VR
Virtual Reality
WebRTC
Web Real-Time Communication
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