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TR 26.806
Study on Tethering AR Glasses –
Architectures, QoS and Media Aspects

3GPP‑Page  
V18.0.0 (Wzip)  2023/06  50 p.
Rapporteur:
Dr. Stockhammer, Thomas
Qualcomm CDMA Technologies

full Table of Contents for  TR 26.806  Word version:  18.0.0

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0 Introduction  1 Scope  2 References  3 Definitions of terms, symbols and abbreviations  4 Motivation and Background  5 System Architectures and Call Flows  6 Identified Key Issues and Potential Solutions  7 Summary of Key Issues and Potential Work Topics  8 Conclusions and Recommendations  A QoS Control of Relay WLAR UE when 5G Sidelink Used for Tethering Link  $ Change history 

 

0  Introduction  p. 6

For initial AR experiences, an expected prominent setup will be wirelessly tethered of AR glasses, typically connected to a 5G UE. The tethering technology between a UE and an AR Glasses may use different connectivity, for example provided through WiFi or 5G sidelink. Different architectures for tethering result in different QoS requirements, session handling properties, and also media handling aspects. For enhanced end-to-end QoS and/or QoE, AR glasses may need to provide functions beyond the basic tethering connectivity function. Generally, smartly tethering AR glasses is an important aspect for successful AR experiences using the 5G System.
Based on this, the present document introduces Smartly Tethering AR Glasses (SmarTAR) in such user experience may be maximized using the 5G System.
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1  Scope  p. 7

The present document addresses architectures, QoS and media handling aspects of when tethering AR Glasses to 5G UEs based on initial discussions in TR 26.998. In particular, the following aspects are in scope:
  • Definition of different tethering architectures for AR Glasses including 5G sidelink and non-5G access based on existing 5G System functionalities.
  • Documentation of the relationship between AR Glasses tethering and AR glasses considered as PIN (Personal IoT Network) elements according to TR 22.859 and the derived service requirements in TS 22.261.
  • Documentation of end-to-end call flows for session setup and handling.
  • Identification media handling aspects of different tethering architectures.
  • Identification of end-to-end QoS-handling for different tethering architectures and define supporting mechanisms to compensate for the non-5G link between the UE and the AR glasses
  • Providing recommendations for suitable architectures to meet typical AR requirements such as low power consumption, low latency, high bitrates, security and reliability.
  • Collaboration with relevant other 3GPP groups on this matter.
  • Identification of potential follow-up work on this matter.
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2  References  p. 7

3  Definitions of terms, symbols and abbreviations  p. 8

3.1  Terms  p. 8

3.2  Symbols  p. 8

3.3  Abbreviations  p. 8

4  Motivation and Background  p. 9

4.1  Summary of TR 26.998  p. 9

4.2  Guiding Use Cases  p. 10

4.2.1  Introduction  p. 10

4.2.2  Cycling Glasses  p. 10

4.3  PIN (Personal IoT Network)  p. 10

4.4  Device Architectures for Tethered Glasses  p. 13

4.4.1  General  p. 13

4.4.2  Tethered Standalone AR Glasses  p. 16

4.4.3  Tethered Display AR Glasses  p. 17

4.4.4  Tethered AR Glasses with 5G Relay  p. 17

5  System Architectures and Call Flows  p. 18

5.1  System Architecture  p. 18

5.2  Call flows  p. 18

5.2.1  Call flows for standalone AR glasses-based device architecture  p. 18

5.2.2  Call flows for display AR glasses-based device architecture without edge rendering  p. 23

5.2.3  Call flows for tethered AR glasses with 5G relay with edge rendering  p. 25

6  Identified Key Issues and Potential Solutions  p. 26

6.1  Key Issue #1: How to provide End-to-End QoS for the 5G relay architecture  p. 26

6.1.1  Description of the key issue  p. 26

6.1.2  Potential solution  p. 27

6.1.2.1  End-to-end latency  p. 27

6.1.2.2  Other End-to-end QoS metrics  p. 27

6.2  Key Issue #2: How to determine the non-5G delay for the 5G relay architecture  p. 28

6.2.1  Description of the key issue  p. 28

6.2.2  Solution: Segment-by-segment delay measurement  p. 28

6.2.3  Solution: End-to-end delay measurement  p. 29

6.2.4  Time measurement protocol  p. 34

6.3  Key Issue #3: What and how to report the non-5G delay  p. 34

6.3.1  Description of the key issue  p. 34

6.3.2  Potential solutions  p. 34

6.4  Key Issue #4: Formats and Connectivity of Tethered Glass  p. 35

6.4.1  Description  p. 35

6.4.2  Background  p. 36

6.4.3  Assumptions  p. 38

6.4.4  Problem Statements  p. 39

6.4.4.1  General  p. 39

6.4.4.2  Case 1: Restricted Raw formats  p. 39

6.4.4.3  Case 2: Transcoding Problem  p. 39

6.4.5  Potential Solutions  p. 39

6.4.5.1  Layer-2 or Layer-3 Relay  p. 39

6.4.5.2  Raw Format adaptation  p. 40

6.4.5.3  Pass-through Compressed Media Formats for XR Runtimes  p. 40

6.4.6  Conclusions  p. 42

6.5  Key Issue #5: Compute distribution across UE and network for tethered glasses  p. 43

6.5.1  Introduction  p. 43

6.5.2  Background  p. 43

6.5.3  Assumptions  p. 44

6.5.4  Problem Statement  p. 45

6.5.5  Potential Solutions  p. 45

6.5.6  Conclusions  p. 45

6.6  Key Issue #6: Usage of PIN for Tethered Glasses  p. 45

6.6.1  Description  p. 45

6.6.2  Potential solutions  p. 46

7  Summary of Key Issues and Potential Work Topics  p. 46

7.1  General  p. 46

7.2  End-to-End QoS  p. 47

7.3  Capabilities, Formats and Connectivity of Tethered Glass  p. 47

7.4  Workflow management in distributed split rendering  p. 47

7.5  Usage of PIN for Tethered Glasses  p. 48

8  Conclusions and Recommendations  p. 48

A  QoS Control of Relay WLAR UE when 5G Sidelink Used for Tethering Link  p. 48

$  Change history  p. 50

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