Content for  TR 26.998  Word version:  18.1.0

In clause 4.8 of TR 26.928, different AR and VR device types had been introduced. This clause provides an update and refinement in particular for AR devices. The focus in this clause mostly on functional components and not on physical implementation of the glass/HMD. Also, in this context the device is viewed as a UE, i.e. which functions are included in the UE. A summary of the different device types is provided in Table 4.2.2.1-1. The Table also covers:

• how the devices are connected to get access to information,
• where the 5G Uu modem is expected to be placed,
• where the AR Runtime (as specified in clause 4.2.1) is placed,
• where the Scene Manager (as specified in clause 4.2.1) is placed,
• where the AR/MR application is running,
• where the power supply/battery is placed.

Examples for current AR devices with assigned properties are for example provided in [49]. For all glass device types, it is assumed that sensors, cameras and microphones are on the device. The definition for Split AR/MR in Table 4.2.2.1-1 is as follows:

• Split: the tethered device (phone/puck) or external entity (cloud/edge) does some power-intense processing (e.g., a pre-rendering of the viewport based on sensor and pose information), and the AR/MR device and/or tethered device performs post-processing considering the latest sensor information (e.g. warping to apply pose correction). Different degrees of split workflow exist, between different devices and entities. Similarly, vision engine functionalities and other AR/MR functions (such as AR/MR media reconstruction, encoding and decoding) may be subject to split computation.

The Wired Tethered AR UE device type is for reference purposes only and not considered in this document as it is not included as part of the study item objectives. Generally, the STAR and WLAR device according to Table 4.2.2.1-1 are expected to have similar functionalities from a 5G System perspective. Based on this, the focus is on three main different device types in the remainder of this document following the rows 1 to 3 in Table 4.2.2.1-1.