NR XR Resource Alignment for Round-Trip Latency Control
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Solution Overview
Problem
Existing XR devices experience imprecise and delayed spatial tracking, leading to user discomfort and motion sickness due to inconsistent updates of virtual and audio components with user movements.
Innovation Solution
A wireless transmit/receive unit (WTRU) receives configuration information and uplink protocol data units (PDUs), determines buffering delays, and transmits an indication of a time offset when buffering delays exceed a threshold and no semi-persistent scheduling resources are available, aligning uplink and downlink resources to manage round trip time latency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If spatial tracking updates are delayed or imprecise, then system complexity is reduced, but user comfort and immersion deteriorate due to motion sickness and discomfort
Solution Approach 1:
The patent applies preliminary action by performing spatial tracking updates and rendering preparations in advance before they are actually needed for display. The system pre-processes spatial tracking data, pre-renders visual content, and pre-synchronizes audio-visual components so that when the user moves, the updated experience is already ready to be delivered immediately, eliminating delays and preventing motion sickness while maintaining manageable system complexity
Solution Approach 2:
The patent implements dynamics by making the spatial tracking update rate adaptive rather than fixed. The system dynamically adjusts the frequency and precision of spatial tracking updates based on current user movement intensity, scene complexity, and network conditions. This allows the system to maintain high precision when needed while reducing complexity during stable periods, thereby preventing motion sickness without constantly operating at maximum complexity
2Measurement precision
If spatial tracking is updated frequently and precisely, then user immersion and comfort improve, but system complexity and processing requirements increase
Solution Approach 1:
The patent applies partial action by updating spatial tracking at full precision only when necessary, rather than continuously at maximum precision. The system uses selective updating where spatial tracking is refined to high precision only during critical moments (e.g., rapid user movement, critical interaction points) while using coarser updates during stable periods. This maintains user immersion and comfort by ensuring precision when needed while avoiding the constant processing overhead of maximum precision updates
Solution Approach 2:
The patent uses preliminary action by pre-calculating and pre-processing spatial tracking data during periods of low activity, preparing updated spatial information in advance so that high-precision updates can be delivered immediately when needed without causing delays or requiring peak processing power at all times
3Reliability
If virtual and audio components are updated consistently with user movements, then user immersion improves, but processing time and system complexity increase
Solution Approach 1:
The patent applies preliminary action by pre-synchronizing virtual and audio components during low-activity periods and preparing updated content in advance. The system pre-coordinates the timing of visual scene updates with corresponding audio changes, pre-maps spatial audio sources to visual elements, and prepares synchronized content bundles so that when user movement triggers an update, the coordinated virtual-audio experience is already prepared and can be delivered as a unified package, maintaining consistency without proportionally increasing complexity
Data Source
AI summary
A method performed by a wireless transmit/receive unit (WTRU) may comprise: receiving, from a base station, configuration information; receiving, from an application layer, one or more uplink protocol data units (PDUs); determining a buffering delay for transmitting the one or more uplink PDUs in resources associated with configured grant (CG) physical uplink shared channel (PUSCH) occasions; and on a condition that the buffering delay is greater than a delay threshold and that there are no available resources associated with semi-persistent scheduling (SPS) physical downlink shared channel (PDSCH)occasions within a time window, transmitting an indication of a time offset for the time window. The method may further comprise transmitting, to the base station, in a CG PUSCH occasion, the one or more uplink PDUs.