Base Station Scheduling for XR Video Display Synchronization
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Solution Overview
Problem
Existing wireless communication systems face challenges in stabilizing the display of video content, particularly in applications requiring ultra-high speed, low latency, and high reliability, such as augmented and virtual reality, due to issues like motion-to-photon latency, which can cause VR sickness.
Innovation Solution
A base station device with a radio communication unit and control unit that adjusts reception timing to ensure video data is transmitted and displayed at a predetermined frame rate, aligning periodic reception timing with display timing to meet specific conditions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If video data is transmitted at a fixed periodic rate, then transmission stability is improved, but display timing synchronization deteriorates when reception timing differs from display timing
Solution Approach 1:
The base station dynamically adjusts the transmission timing of video data based on the terminal device's display timing information. Instead of using a fixed periodic transmission schedule, the system adapts the transmission timing to match the terminal's display refresh cycle, thereby maintaining both transmission stability and display synchronization.
Solution Approach 2:
The terminal device feeds back its display timing information to the base station, which then uses this feedback to adjust the video data transmission timing. This closed-loop feedback mechanism ensures that the transmission schedule remains synchronized with the terminal's display refresh rate, preventing timing mismatches.
2Speed
If video data is transmitted with higher speed, then ultra-high speed transmission is achieved, but motion-to-photon latency increases causing VR sickness
Solution Approach 1:
The base station transmits video data in advance of the terminal device's display timing, using the fed back display timing information to determine the optimal advance transmission time. This preliminary action allows the terminal to receive and process the video data before it needs to be displayed, reducing motion-to-photon latency while maintaining high transmission speeds.
3Device complexity
If periodic reception timing is fixed, then transmission scheduling is simplified, but synchronization with display timing becomes difficult when timing difference exceeds threshold
Solution Approach 1:
The terminal device autonomously determines its own display timing and feeds this information back to the base station. The base station then uses this information to self-adjust its transmission scheduling, eliminating the need for complex centralized synchronization control while maintaining reliable timing synchronization.
Data Source
AI summary
There is provided a communication device that includes circuitry for supporting extended reality (XR) services. The communication device obtains information related to XR traffic periods from a core network and uses this to adjust power-saving settings. When a delay between the reception time and the display time of video data at a terminal device exceeds a certain threshold, the communication device modifies scheduling parameters for data transmission. The communication device adjusts the configured grant configuration and optimizes the terminal's reception timing by configuring discontinuous reception (DRX) settings based on control channel monitoring requirements and transmission periodicity.