Digital Representation

Description

A digital representation, as defined in 3GPP TS 22.156 and TR 22.856, is a key concept within the mobile metaverse. It refers to the media content that is associated with the presentation of a particular virtual or physical object within a metaverse session. This media can include visual, auditory, haptic, or other sensory formats that collectively render the object in the digital realm. The digital representation is not merely a static model; it can dynamically reflect the current state of the object it represents, enabling real-time interaction and synchronization between the physical and virtual worlds. For instance, an avatar is a specific type of digital representation that represents a user in the metaverse, conveying their appearance, movements, and expressions.

The architecture supporting digital representations leverages the 5G system's advanced capabilities, including high data rates, low latency, and edge computing. The mobile metaverse media is typically generated, processed, and rendered across a distributed set of network functions. User equipment (UE) such as AR/VR headsets capture user inputs and sensor data, which are then transmitted to edge application servers for processing. These servers may host the digital representation's logic, update its state based on inputs, and stream the rendered media back to the UEs. The 5G core network, with its QoS framework and network exposure functions, ensures that the required performance characteristics (e.g., throughput, latency) are met for a seamless experience.

Key components involved in digital representations include the media capture and rendering devices, the transport network, and the metaverse application functions. The 3GPP system provides the underlying connectivity and service enablers, such as the 5G Media Streaming (5GMS) architecture and the edge computing (EDGEAPP) framework, which allow for efficient distribution of media and computation. Additionally, the concept of digital representation is closely tied to digital twins, where a digital representation might serve as the visual interface or avatar for a digital twin of a physical asset.

The role of digital representations in the network is to enable immersive, interactive applications that blend the physical and virtual worlds. They are fundamental to use cases such as virtual meetings, remote collaboration, telepresence, and gaming. By providing a standardized way to describe and handle these media objects, 3GPP ensures interoperability and consistent service quality across different vendors and deployments. This is essential for the widespread adoption of metaverse services over 5G and beyond.

In summary, digital representations are the building blocks of the mobile metaverse, enabling users to interact with virtual and physical objects in a natural and engaging manner. Their support requires a holistic approach that integrates media handling, network performance, and edge computing, which 3GPP is addressing in its Release 19 and beyond specifications.

Purpose & Motivation

The concept of digital representations was introduced to provide a standardized framework for handling media associated with objects in the mobile metaverse. As 5G networks evolved to support immersive services, there was a need to define how virtual and physical objects are represented digitally, how their states are synchronized, and how they are presented to users. Without such a definition, metaverse applications would lack interoperability and could not reliably deliver consistent experiences across different devices and networks.

Previous approaches to representing objects in virtual environments were often proprietary and limited to specific applications or platforms. They did not account for the unique challenges of mobile networks, such as varying latency, bandwidth, and device capabilities. The digital representation concept addresses these limitations by abstracting the media and state information into a form that can be efficiently transported and processed over 5G. It also enables advanced features like real-time updates and multi-user interaction.

Furthermore, the digital representation is a foundational element for digital twins in the metaverse. By aligning the two concepts, 3GPP ensures that the visual and interactive aspects of a digital twin are properly supported. This alignment is crucial for industrial and consumer applications where a digital twin must be presented to users in an intuitive way. The introduction in Release 19 reflects the growing maturity of metaverse standards and the need to support emerging use cases.