Communication Apparatus Data Size Control for HMD Latency
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Solution Overview
Problem
In half-duplex wireless communication systems, particularly in head-mounted displays (HMDs), achieving a target round-trip communication time is challenging due to data size variations and poor communication environments, leading to incomplete data transmission and user discomfort.
Innovation Solution
A communication apparatus and method that control data size generation per unit time based on successfully received data size and specified round-trip communication time, including mechanisms for transmitting size data even in cases of partial data loss and using predetermined data to supplement missing packets, ensuring stable and efficient data transmission.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If the size of data generated per unit time is increased to improve video quality, then the image quality of displayed video is improved, but the round-trip communication time exceeds the target time causing user discomfort
Solution Approach 1:
The system implements feedback control by having the communication partner apparatus transmit size data indicating the amount of data successfully received per unit time. The communication apparatus uses this feedback to dynamically adjust its data generation rate, comparing the actual communication performance against target values and modifying subsequent data transmission accordingly to maintain both quality and timing requirements.
Solution Approach 2:
The data generation rate is made dynamic rather than fixed. The communication apparatus adjusts the size of data generated per unit time based on real-time communication conditions and feedback from the partner apparatus, allowing the system to adapt to varying network conditions while maintaining target round-trip times and video quality.
2Loss of time
If the size of data generated per unit time is reduced to meet target round-trip communication time, then communication timing is improved, but video quality deteriorates
Solution Approach 1:
The feedback mechanism allows the system to determine the maximum sustainable data rate that meets timing requirements. By continuously receiving size data from the partner apparatus and comparing actual communication performance against targets, the system identifies the optimal data generation rate that satisfies both timing and quality constraints.
3Productivity
If data transmission continues in poor communication environments, then data throughput is maintained, but data loss increases and round-trip communication time cannot meet target time
Solution Approach 1:
The feedback control mechanism detects communication environment quality through size data from the partner apparatus. When data loss is detected or timing targets are not met, the system automatically reduces the data generation rate, preventing further data loss while maintaining reliable communication. This adaptive approach ensures both throughput and reliability by adjusting to environmental conditions.
4Productivity
If the size of data generated per unit time is controlled based only on communicated data size without considering successful reception, then data generation efficiency is maintained, but round-trip communication time cannot be brought close to target time in poor communication environments
Solution Approach 1:
The system uses feedback from size data indicating successfully received data to accurately measure actual communication performance. This allows the communication apparatus to adjust its data generation rate based on real reception success rather than just transmission attempts, ensuring that controlled data generation truly reflects successful communication and meets timing targets.
Data Source
AI summary
A video data transmission unit transmits data generated by a video data generation unit to an HMD. A sensing data reception unit receives data transmitted from the HMD, the data including size data indicating a size of the data successfully received by the HMD. A required time specification unit specifies time it took for a round-trip communication in half-duplex wireless communication between a relay apparatus and the HMD. A generation control unit controls a size of the data generated by the video data generation unit per unit time based on the specified time, the size indicated in the size data, and a given target time regarding the round-trip communication.