Documentation updates (#136)

* Create mpeg-i-scene-description.md

* Update mpeg-i-scene-description.md

* Update mpeg-i-scene-description.md

* Update xr-specifications.md

* Create 3gpp-specifications.md

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* Update xr-specifications.md

* Update 3gpp-specifications.md

* Update mpeg-i-scene-description.md

* Update mpeg-i-scene-description.md

* Create mpeg-i-sd-0.png

* Add files via upload

* Update mpeg-i-scene-description.md

* Delete pages/xr/xr-specifications.md

* Update xr-worktiems.md

* Update mpeg-i-scene-description.md

* Update 3gpp-specifications.md

* Update 3gpp-specifications.md

* Update mpeg-i-scene-description.md

* Update xr-worktiems.md

* Update xr.md

* Update 5g-media-streaming.md

* Update 5g-multicast-broadcast-services.md

* Update lte-based-5g-broadcast.md

* Rename xr-worktiems.md to 3gpp-worktiems.md

* Update and rename lte-based-5g-broadcast-specifications.md to 3gpp-specifications.md

* Update lte-based-5g-broadcast-workitems.md

* Rename lte-based-5g-broadcast-workitems.md to 3gpp-workitems.md

* Update 3gpp-specifications.md

* Update 3gpp-worktiems.md

* Update mpeg-i-scene-description.md

* Create mpeg-specifications.md

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* Update mpeg-i-scene-description.md

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* Create ietf-specifications.md

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* Create multimedia-content-delivery.md

* Update 5g-multicast-broadcast-services-specifications.md

* Rename 5g-multicast-broadcast-services-specifications.md to 3gpp-specifications.md

* Rename 5g-multicast-broadcast-services-workitems.md to 3gpp-workitems.md

* Update 3gpp-specifications.md

* Update ietf-specifications.md

* Update 3gpp-specifications.md

* Rename 3gpp-worktiems.md to 3gpp-workitems.md

* Update 3gpp-specifications.md

* Update and rename 5g-media-streaming-specifications.md to 3gpp-specifications.md

* Update and rename 5g-media-streaming-workitems.md to 3gpp-workitems.md

* Update 3gpp-workitems.md

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* Update ietf-specifications.md

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* Update 5g-media-streaming.md

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* Update xr.md

pages/5g-media-streaming.md

@@ -2,12 +2,7 @@
 layout: default
 title: 5G Media Streaming
 has_children: true
-nav_order: 1
+nav_order: 0
 ---
 
 # 5G Media Streaming
-## 📑 Specifications and relevant references
-* Information about relevant specifications can be found in this [page](5g-media-streaming/5g-media-streaming-specifications.html)
-
-## 📑 Relevant Work Items
-* A list of relevant 3GPP Work Items can be found in this [page](5g-media-streaming/5g-media-streaming-workitems.html)

pages/5g-media-streaming/5g-media-streaming-specifications.md → pages/5g-media-streaming/3gpp-specifications.md

@@ -1,12 +1,12 @@
 ---
 layout: default
-title: Specifications
+title: 3GPP Specifications
 parent: 5G Media Streaming
 has_children: false
 nav_order: 0
 ---
 
-# 📑 Specifications and relevant references
+# Related 3GPP Specifications
 
 This is a list of specifications in the scope of 5G Media Streaming.
 

pages/5g-media-streaming/5g-media-streaming-workitems.md → pages/5g-media-streaming/3gpp-workitems.md

@@ -1,10 +1,10 @@
 ---
 layout: default
-title: Work Items
+title: 3GPP Work Items
 parent: 5G Media Streaming
 has_children: false
 nav_order: 1
 ---
 
-# 📑 Relevant Work Items
+# Related 3GPP Work Items
 * TBD

pages/5g-multicast-broadcast-services.md

@@ -6,11 +6,3 @@ nav_order: 3
 ---
 
 # 5G Multicast Broadcast Services
-## 📑 Specifications and relevant references
-* Information about relevant specifications can be found in this [page](5g-multicast-broadcast-services/5g-multicast-broadcast-services-specifications.html)
-
-## 📑 Relevant Work Items
-* A list of relevant 3GPP Work Items can be found in this [page](5g-multicast-broadcast-services/5g-multicast-broadcast-services-workitems.html)
-
-## 📑 Guidelines and Profiles
-* A quick guide on MBS Broadcast RAN Procedure can be found in this [page](5g-multicast-broadcast-services/mbs-broadcast-RAN.html)

pages/5g-multicast-broadcast-services/5g-multicast-broadcast-services-specifications.md → pages/5g-multicast-broadcast-services/3gpp-specifications.md

@@ -1,12 +1,12 @@
 ---
 layout: default
-title: Specifications
+title: 3GPP Specifications
 parent: 5G Multicast Broadcast Services
 has_children: false
 nav_order: 0
 ---
 
-# 📑 Specifications and relevant references
+# Related 3GPP Specifications
 
 This is a list of specifications in the scope of 5G Multicast Broadcast Services.
 

pages/5g-multicast-broadcast-services/5g-multicast-broadcast-services-workitems.md → pages/5g-multicast-broadcast-services/3gpp-workitems.md

@@ -1,10 +1,9 @@
 ---
 layout: default
-title: Work Items
+title: 3GPP Work Items
 parent: 5G Multicast Broadcast Services
 has_children: false
 nav_order: 1
 ---
 
-# 📑 Relevant Work Items
-* TBD
+# Related 3GPP Work Items

pages/lte-based-5g-broadcast.md

@@ -6,8 +6,3 @@ nav_order: 2
 ---
 
 # MBMS and LTE-based 5G Broadcast
-## 📑 Specifications and relevant references
-* Information about relevant specifications can be found in this [page](lte-based-5g-broadcast/lte-based-5g-broadcast-specifications.html)
-
-## 📑 Relevant Work Items
-* A list of relevant 3GPP Work Items can be found in this [page](lte-based-5g-broadcast/lte-based-5g-broadcast-workitems.html)

pages/lte-based-5g-broadcast/lte-based-5g-broadcast-specifications.md → pages/lte-based-5g-broadcast/3gpp-specifications.md

@@ -1,12 +1,12 @@
 ---
 layout: default
-title: Specifications
+title: 3GPP Specifications
 parent: MBMS and LTE-based 5G Broadcast
 has_children: false
 nav_order: 0
 ---
 
-# 📑 Specifications and relevant references
+# Related 3GPP Specifications
 
 This is a list of specifications in the scope of MBMS / LTE-based 5G Terrestrial Broadcast.
 

pages/lte-based-5g-broadcast/lte-based-5g-broadcast-workitems.md → pages/lte-based-5g-broadcast/3gpp-workitems.md

@@ -1,10 +1,9 @@
 ---
 layout: default
-title: Work Items
+title: 3GPP Work Items
 parent: MBMS and LTE-based 5G Broadcast
 has_children: false
 nav_order: 1
 ---
 
-# 📑 Relevant Work Items
-* TBD
+# Related 3GPP Work Items

pages/multimedia-content-delivery.md

@@ -0,0 +1,8 @@
+---
+layout: default
+title: Multimedia Content Delivery
+has_children: true
+nav_order: 1
+---
+
+# Multimedia Content Delivery

pages/multimedia-content-delivery/ietf-specifications.md

@@ -0,0 +1,17 @@
+---
+layout: default
+title: IETF Specifications
+parent: Multimedia Content Delivery
+has_children: true
+nav_order: 1
+---
+
+# Related IETF Specifications
+
+This is a list of specifications in the scope of Multimedia Content Delivery Protocols.
+
+## FLUTE: Main specifications and informative references
+Details on FLUTE (File Delivery over Unidirectional Transport) are defined in [IETF RFC 6726](https://datatracker.ietf.org/doc/rfc6726/).
+
+## ROUTE: Main specifications and informative references
+Details on ROUTE (Real-time Object delivery over Unidirectional Transport) are defined in [IETF RFC 9223](https://datatracker.ietf.org/doc/rfc9223/).

pages/xr.md

@@ -6,8 +6,3 @@ nav_order: 4
 ---
 
 # eXtended Reality (XR)
-## 📑 Specifications and relevant references
-* Information about relevant specifications can be found in this [page](xr/xr-specifications.html)
-
-## 📑 Relevant Work Items
-* A list of relevant 3GPP Work Items can be found in this [page](xr/xr-workitems.html)

pages/xr/xr-specifications.md → pages/xr/3gpp-specifications.md

@@ -1,12 +1,12 @@
 ---
 layout: default
-title: Specifications
+title: 3GPP Specifications
 parent: eXtended Reality (XR)
 has_children: false
 nav_order: 0
 ---
 
-# 📑 Specifications and relevant references
+# Related 3GPP Specifications
 
 This is a list of specifications in the scope of eXtended Reality (XR).
 
@@ -71,3 +71,4 @@ This is a list of specifications in the scope of eXtended Reality (XR).
 [26.926](https://www.3gpp.org/dynareport/26926.htm) | TR | Traffic Models and Quality Evaluation Methods for Media and XR Services in 5G Systems | Under change control | S4
 [26.996](https://www.3gpp.org/dynareport/26996.htm) | TR | Immersive Audio for Split Rendering Scenarios; Performance characterization | Draft | S4
 [26.997](https://www.3gpp.org/dynareport/26997.htm) | TR | IVAS codec performance characterization | Draft | S4
+

pages/xr/xr-worktiems.md → pages/xr/3gpp-workitems.md

@@ -1,12 +1,14 @@
 ---
 layout: default
-title: Work Items
-parent: eXtended Reality (XR)
+title: 3GPP Work Items
+grand_parent: eXtended Reality (XR)
+parent: 3GPP Specifications
 has_children: false
-nav_order: 1
+nav_order: 0
 ---
 
-# 📑 Relevant Work Items
+# Related 3GPP Work Items
+
 ## Release 18
 
 Work Item | Acronym | Title | Rel | WG

pages/xr/mpeg-i-scene-description.md

@@ -0,0 +1,55 @@
+---
+layout: default
+title: Overview on MPEG-I Scene Description
+grand_parent: eXtended Reality (XR)
+parent: MPEG Specifications
+has_children: false
+nav_order: 0
+---
+
+# Overview on MPEG-I Scene Description
+MPEG-I Scene Description (MPEG-I SD) is a standard developed by MPEG for immersive media.
+It defines the structure and composition of a 3D scene, referencing and positioning 2D and 3D assets in the scene, and provides information for rendering the scene properly.
+
+The MPEG-I Scene Description standard and glTF (Graphics Library Transmission Format) share a connection in the realm of 3D scenes and models. glTF was chosen as the base scene description technology.
+Developed by the Khronos Group, glTF is an open standard that integrates media assets using technologies like OpenGL. In essence, glTF provides a way to describe 3D model geometry, appearance, scene hierarchy, and animation1.
+
+MPEG-I Scene Description (ISO/IEC 23090-14) specifies how to reference and position 2D and 3D assets within a scene, enabling proper rendering and creating rich 3D scenes with real-time media delivery and interactivity.
+Khronos has adopted the MPEG-I Scene Description extensions as defined in [https://github.com/KhronosGroup/glTF/blob/main/extensions/README.md](https://github.com/KhronosGroup/glTF/blob/main/extensions/README.md).
+
+## Reference architecture:
+MPEG-I SD defined the following reference architecture.
+![image](./images/mpeg-i-sd-0.png)
+
+* The Presentation Engine replaces a traditional 2D media player. It is responsible for multi-modal rendering of a scene composed of audiovisuals and haptics media. It also provides information about the viewer's and object pose to optimize delivery.
+* The Media Access Function (MAF) is responsible for the media access and processing functions. Media handling is delegated to the MAF by the Presentation Engine. The MAF constructs a suitable media pipeline to transform media from a delivery format into the formats used during rendering. the MAF uses MIME type and codec parameters to identify support for the media reconstruction and assemble the adequate media pipeline.
+* The MAF API is used by the Presentation Engine to request immersive media in the scene.
+* The Buffers are fed by the processed media with a format defined through the scene description document in SO/IEC 23090-14
+
+## Vendor extensions to Khronos glTF 2.0
+![image](./images/mpeg-i-sd-1.png)
+
+A first set of extensions (green in the figure) enable the timed framework including:
+* [<em>MPEG_media</em>](https://github.com/KhronosGroup/glTF/blob/main/extensions/2.0/Vendor/MPEG_media/README.md), which enables the referencing of external media streams that are delivered over protocols such as RTP/SRTP, MPEG-DASH, or others
+* [<em>MPEG_accessor_timed</em>](https://github.com/KhronosGroup/glTF/blob/main/extensions/2.0/Vendor/MPEG_accessor_timed/README.md), used in a scene that contains timed media and/or metadata to describe access to the dynamically changing data
+* [<em>MPEG_buffer_circular</em>](https://github.com/KhronosGroup/glTF/blob/main/extensions/2.0/Vendor/MPEG_buffer_circular/README.md), to extend the buffer into a circular buffer
+
+A second group of extensions (gray in the figure) enables the inclusion of dynamic and temporal media including:
+* [<em>MPEG_texture_video</em>](https://github.com/KhronosGroup/glTF/blob/main/extensions/2.0/Vendor/MPEG_texture_video/README.md). provides the possibility to link a texture object defined in glTF 2.0 to media and its respective track
+* [<em>MPEG_audio_spatial</em>](https://github.com/KhronosGroup/glTF/blob/main/extensions/2.0/Vendor/MPEG_audio_spatial/README.md), to support spatial audio
+* [<em>MPEG_mesh_linking</em>](https://github.com/KhronosGroup/glTF/blob/main/extensions/2.0/Vendor/MPEG_mesh_linking/README.md), provides the possibility to link a mesh to another mesh in a glTF asset
+* [<em>MPEG_scene_dynamic</em>](https://github.com/KhronosGroup/glTF/blob/main/extensions/2.0/Vendor/MPEG_scene_dynamic/README.md), [<em>MPEG_viewport_recommended</em>](https://github.com/KhronosGroup/glTF/blob/main/extensions/2.0/Vendor/MPEG_viewport_recommended/README.md), and [<em>MPEG_animation_timing</em>](https://github.com/KhronosGroup/glTF/blob/main/extensions/2.0/Vendor/MPEG_animation_timing/README.md), which indicate that a particular form of timed data is provided to the Presentation Engine during the consumption of the scene and that it shall adapt to the changing information.
+
+![image](./images/mpeg-i-sd-2.png)
+
+A third group of extensions enables the distribution of real-time immersive and interactive media content including:
+* Augmented Reality anchor (<em>MPEG_scene_anchor</em>, <em>MPEG_node_anchor</em>), to support AR experiences where virtual content is inserted into the user's real environment
+* Interactivity (<em>MPEG_scene_interactivity</em>, <em>MPEG_node_interactivity</em>), to describe interactivity at runtime with support for interactions between user and virtual objects and between virtual objects, with triggers based on proximity, visibility, collision or user input.
+* Avatar (<em>MPEG_node_avatar</em>), to support the representation of 3D avatars.
+* Lighting (<em>MPEG_light</em>), to provide a realistic user experience including shadows and lighting.
+* Haptics (<em>MPEG_haptic</em>, <em>MPEG_material_haptic</em>), to support haptics based on the MPEG standard for Coded representation of Haptics ny attaching haptic information to a node or to a mesh.
+
+
+# References:
+* IBC2023 TECH PAPERS: MPEG-I SCENE DESCRIPTION: A DYNAMIC SCENE DESCRIPTION FRAMEWORK FOR IMMERSIVE MEDIA ([link](https://www.ibc.org/download?ac=24724))
+* glTF 2.0 extension in MPEG and 3GPP ([link](https://www.khronos.org/assets/uploads/developers/presentations/glTF_2.0_Extensions_in_MPEG_and_3GPP_.pdf))

pages/xr/mpeg-specifications.md

@@ -0,0 +1,17 @@
+---
+layout: default
+title: MPEG Specifications
+parent: eXtended Reality (XR)
+has_children: true
+nav_order: 1
+---
+
+# Related MPEG Specifications
+
+This is a list of specifications in the scope of eXtended Reality (XR).
+
+## MPEG-I Scene Description
+
+ Number | Title  
+ -- | --
+[ISO/IEC 23090-14:2023](https://www.iso.org/standard/80900.html) | Information technology - Coded representation of immersive media - Part 14: Scene description