Dynamic Frame Image Size Control for Wireless HMD Latency
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Solution Overview
Problem
In wireless communication for head-mounted displays, there is a challenge in transmitting high-definition moving images without delays, as existing technologies struggle to control frame image size effectively to ensure timely reception and minimize player discomfort during gameplay.
Innovation Solution
A reception apparatus and transmission apparatus that dynamically adjust frame image size based on the time required to receive previous frames, using adaptive modulation and coding techniques, and considering wireless-physical-layer information and head-mounted display posture changes to ensure appropriate timing and quality of image transmission.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If the frame image size is increased to improve high-definition quality, then the image quality is improved, but the reception time increases causing delays
Solution Approach 1:
The patent implements dynamic adjustment of frame image size based on real-time reception conditions. The reception apparatus controls the frame image size of subsequent frames according to the time required to receive previous frames, making the system adaptive rather than static. This resolves the contradiction by allowing high definition when conditions permit while ensuring timely delivery when needed.
Solution Approach 2:
The patent changes the parameter of frame image size based on reception time measurements. By monitoring whether the reception time of a frame exceeds a target time, the system adjusts the frame image size parameter for subsequent frames, transforming a fixed parameter into a variable one that adapts to communication conditions.
2Loss of time
If the frame image size is decreased to reduce reception time, then the reception timing is improved, but the image quality deteriorates
Solution Approach 1:
The system dynamically adjusts frame image size based on whether the previous frame's reception time exceeded the target time. When reception timing is critical, the frame size is reduced; when there is margin, the frame size can be increased for better quality. This creates a balanced adaptive system rather than a fixed compromise.
3Speed
If the frame rate is increased to improve smoothness, then the display smoothness is improved, but the reception timing becomes unreliable
Solution Approach 1:
The patent implements a feedback mechanism where the reception apparatus monitors the actual reception time of frames and uses this information to control the frame image size of subsequent frames. This closed-loop control ensures that frame rate increases do not compromise reception timing reliability, as the system adjusts parameters based on actual performance.
Data Source
AI summary
Provided are a reception apparatus, a transmission apparatus, a control method, a transmission method, and a program that can control a frame image size of each frame image so that the frame image constituting a moving image is transmitted at an appropriate timing. A frame-image reception section receives a first frame image constituting the moving image. A control-data update section performs control so that the frame image size of a second frame image constituting the moving image, which is received after the first frame image, corresponds to a time required to receive the first frame image.