Retransmission Control for Automated Driving Frame Rate Stability
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Solution Overview
Problem
In communication systems for automated vehicle driving, frequent sensor data retransmissions due to deteriorated transmission path characteristics can lead to delays, potentially disrupting the desired frame rate.
Innovation Solution
A communication device and system that determine the propriety of retransmission requests based on priority specified for each area within a frame, generating and transmitting retransmission request data only when permitted, to prevent delays from spreading to subsequent frames.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If frequent retransmission of sensor data is performed to ensure data reliability, then data transmission reliability is improved, but frame rate is reduced due to delay spreading to next frames
Solution Approach 1:
The patent segments the frame into multiple priority areas (high priority and low priority areas) and applies different retransmission control strategies to each segment. High priority areas maintain strict retransmission control to prevent delay spreading, while low priority areas allow more flexible retransmission, thus resolving the contradiction between reliability and frame rate by differentiating treatment across segments.
Solution Approach 2:
The patent applies local quality control by specifying different retransmission permission rules for different areas within the frame. High priority areas have restricted retransmission to maintain frame rate, while low priority areas have relaxed retransmission rules to ensure data reliability, allowing each local region to optimize for its specific requirements.
2Productivity
If retransmission control is implemented to maintain frame rate, then frame rate is improved, but data transmission reliability may deteriorate
Solution Approach 1:
The patent divides the data transmission into high priority and low priority segments, applying differentiated retransmission control. High priority data maintains frame rate through strict control, while low priority data benefits from relaxed control for improved reliability, thus resolving the contradiction by segmenting the uniform control approach.
Solution Approach 2:
The patent implements local quality differentiation where high priority areas enforce strict retransmission control to maintain frame rate, while low priority areas allow more flexible retransmission to improve reliability, allowing the system to optimize both parameters in their respective local regions.
3Productivity
If priority-based retransmission control is applied to prevent delay spreading, then frame rate is maintained, but retransmission flexibility is reduced
Solution Approach 1:
The patent applies local quality control by implementing different retransmission flexibility levels for different priority areas. High priority areas have reduced flexibility to maintain frame rate, while low priority areas retain more flexibility for adaptive retransmission, thus resolving the contradiction between frame rate maintenance and retransmission flexibility through spatial differentiation.
Data Source
AI summary
There is provided a communication device which includes a determination section that determines propriety of a retransmission request on a basis of priority specified for each area within a frame in retransmission control, and a transmission section that generates retransmission request data, and makes transmission to another communication device, in a case where the retransmission request is permitted in the determination section.