Content for TR 38.835 Word version: 18.0.1

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3.1 Terms 3.2 Abbreviations
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1 Scope p. 7

The present document is intended to capture the output of the study item on XR Enhancements for NR [10], which aims at investigating power saving and capacity enhancements techniques tailored for XR services, as well as means to provide XR-awareness in RAN.

This study follows a series of earlier studies conducted in 3GPP by SA1 [2], SA4 [5] [6] [7] and RAN1 [8]. It is complemented by work in SA2 [12], SA4 [11] and SA6 [4].

2 References p. 7

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

References are either specific (identified by date of publication, edition number, version number, etc.) or non-specific.
For a specific reference, subsequent revisions do not apply.
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.

[1]

TR 21.905: "Vocabulary for 3GPP Specifications".

[2]

TR 22.842: "Study on Network Controlled Interactive Service (NCIS) in the 5G System (5GS)".

[3]

TR 23.748: "Study on enhancement of support for Edge Computing in 5G Core network(5GC)".

[4]

TR 23.758: "Study on application architecture for enabling Edge Applications".

[5]

TR 26.918: "Virtual Reality (VR) media services over 3GPP".

[6]

TR 26.926: "Traffic Models and Quality Evaluation Methods for Media and XR Services in 5G Systems".

[7]

TR 26.928: "Extended Reality (XR) in 5G".

[8]

TR 38.838: "Study on XR (Extended Reality) evaluations for NR".

[9]

TR 23.700-60: "Study on architecture enhancement for XR and media services".

[10]

RP-220285: "Study on XR Enhancements for NR".

[11]

SP-210043: "Feasibility Study on Typical Traffic Characteristics for XR Services and other Media".

[12]

SP-220705: "Study on XR (Extended Reality) and media services s".

[13]

S4-220505: "LS Reply on QoS support with PDU Set granularity".

[14]

S4aV220921: "Reply LS on further details on XR traffic".

[15]

TS 38.300: "NR and NG-RAN Overall description; Stage-2".

[16]

S4-221626: "Reply LS on Pose Information".

[17]

S4aR230035: "Reply LS on PDU Set Handling"

3 Definitions of terms, symbols and abbreviations p. 8

3.1 Terms p. 8

For the purposes of the present document, the terms given in TR 21.905 and the following apply. A term defined in the present document takes precedence over the definition of the same term, if any, in TR 21.905.

Field of view:

the angle of visible field expressed in degrees measured from the focal point.

PDU Set:

A PDU Set is composed of one or more PDUs carrying the payload of one unit of information generated at the application level (e.g. a frame or video slice for XRM Services, as used in TR 26.926). In some implementations all PDUs in a PDU Set are needed by the application layer to use the corresponding unit of information. In other implementations, the application layer can still recover parts or all of the information unit, when some PDUs are missing.

Multi-modal Data:

Multi-modal Data is defined to describe the input data from different kinds of devices/sensors or the output data to different kinds of destinations (e.g. one or more UEs) required for the same task or application. Multi-modal Data consists of more than one Single-modal Data, and there is strong dependency among each Single-modal Data. Single-modal Data can be seen as one type of data.

Data Burst:

Data produced by the application in a short period of time, comprising PDUs from one or more PDU Sets.

3.2 Abbreviations p. 8

For the purposes of the present document, the abbreviations given in TR 21.905, TS 38.300 and the following apply. An abbreviation defined in the present document takes precedence over the definition of the same abbreviation, if any, in TR 21.905 and in TS 38.300.

3DoF

Three Degrees of Freedom

6DoF

Six Degrees of freedom

Augmented Reality

DASH

Dynamic Adaptive Streaming over HTTP

FEC

Forward Error Correction

FoV

Field of view

FPS

Frames Per Second

GBR

Guaranteed Bit Rate

GFBR

Guaranteed Flow Bit Rate

HEVC

High-Efficiency Video Coding

HMD

Head-Mounted Display

HUD

Heads-Up Display

PDB

Packet Delay Budget

PDU

Protocol Data Unit

PER

Packet Error Rate

PSDB

PDU-Set Delay Budget

PSER

PDU-Set Error Rate

PSI

PDU-Set Importance

PSIHI

PDU-Set Integrated Handling Indication

QCI

QoS Class Identifier

QFI

QoS Flow ID

QoE

Quality of Experience

QoS

Quality of Service

Virtual Reality

Extended reality