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  ITU-T A.5 justification information for referenced document 3GPP TR 26.928 V18.0.0 in draft J.cloud-game-trr
1. Clear description of the referenced document:
Name: 3GPP TR 26.928 V18.0.0
Title: Extended Reality (XR) in 5G
2. Status of approval:
Published Release 18 TR; status on the 3GPP spec page: Under change control (maintained via CR process). The ETSI mirror PDF is available as ETSI TR 126 928 V18.0.0 (2024-05)
3. Justification for the specific reference:
This Recommendation normatively aligns its terminal-side KPIs and terminology (e.g., round-trip interaction delay, decoder/display latency, XR interaction chains) to TR 26.928 to ensure consistency with 5G/XR specifications and interoperability assumptions toward cloud-gaming/XR platforms, while avoiding duplication of Stage-2 network/service aspects
4. Current information, if any, about IPR issues:
None
5. Other useful information describing the "Quality" of the document:
Developed under 3GPP governance with public availability, formal change-control, and release-based versioning. The ETSI delivery portal provides an authenticated PDF; the 3GPP spec page exposes status/history. TR 26.928 is widely cited in 5G/XR technical literature and related 3GPP specifications.
6. The degree of stability or maturity of the document:
High maturity / stable snapshot for Release 18 (V18.0.0); subsequent maintenance via CRs. Backward-compatibility and follow-on work are handled in later releases.
7. Relationship with other existing or emerging documents:
Complements ITU-T J.1311 (platform-oriented) by providing network/service context for XR; this Recommendation focuses on terminal-side capability within the J-series remit. Referenced by / aligned with 3GPP media/XR specs (e.g., TS 26.119 cites TR 26.928 for AR/XR context).
8. Any explicit references within that referenced document should also be listed:
3GPP specifications referenced by TR 26.928/
[1] 3GPP TR 21.905 – Vocabulary for 3GPP Specifications. /
[2] 3GPP TR 26.918 – Virtual Reality (VR) media services over 3GPP. /
[3] 3GPP TS 26.118 – 3GPP Virtual reality profiles for streaming applications. /
[6] 3GPP TR 22.842 – Study on Network Controlled Interactive Service in 5GS. /
[7] 3GPP TR 26.247 – PSS; Progressive Download and Dynamic Adaptive Streaming over HTTP (3GP-DASH). /
[8] 3GPP TS 23.501 – System Architecture for the 5G System. /
[12] 3GPP TS 26.501 – 5G Media Streaming Architecture. /
[13] 3GPP TS 22.173 – IMS Multimedia Telephony Service and supplementary services; Stage 1. /
[14] 3GPP TS 26.114 – IMS; Multimedia Telephony; Media handling and interaction. /
[15] 3GPP TR 22.891 – Feasibility Study on New Services and Markets Technology. /
/
Other SDO specifications referenced/
[16] Khronos – OpenXR Specification (registry link). /
[17] W3C – WebXR Device API.
9. Qualification of 3GPP:
3GPP is qualified under Recommendation ITU-T A.5 since 09/2020, applying ITU-T A.5 §7.3. Reference: SG15-R24 (2020-09)
10. Other (for any supplementary information):
Some drafts cite “(2023-03)” for V18.0.0; the ETSI delivery shows (2024-05) as the publication stamp for the mirror PDF. For consistency, use a single date across the Recommendation (prefer the ETSI publication date when citing the downloadable PDF).
Note: This form is based on Recommendation ITU-T A.5