Nonvolatile Memory Segmentation for Autonomous Driving Event Data
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Solution Overview
Problem
The challenge in autonomous driving vehicles is efficiently storing large amounts of sensing data while ensuring substantiation information for accident responsibility is secured, as existing methods are inefficient and do not differentiate between critical and non-critical data.
Innovation Solution
A storage device with a nonvolatile memory system that classifies and stores sensing data based on event type, using separate memory areas for critical (read-only) and non-critical data, ensuring critical data is protected from alteration or deletion.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If all sensing data is stored to ensure complete accident substantiation, then data completeness is improved, but storage efficiency deteriorates
Solution Approach 1:
The memory cell array is divided into a first memory area for critical sensing data and a second memory area for non-critical sensing data. This segmentation allows the system to store only essential accident-related information in the first area with higher protection, while storing less critical data in the second area, thereby improving storage efficiency while maintaining data completeness for accident substantiation.
Solution Approach 2:
Different protection levels are applied to different memory areas. The first memory area stores critical data with read-only protection and higher integrity requirements, while the second memory area stores non-critical data with standard protection. This local quality differentiation ensures that accident-substantiating data receives maximum protection while overall storage efficiency is improved.
2Reliability
If critical sensing data is protected from alteration or deletion to ensure accident responsibility determination, then data integrity is improved, but device complexity increases
Solution Approach 1:
The memory is segmented into protected and non-protected areas. The first memory area is configured with read-only protection to prevent alteration or deletion of critical accident data, while the second area allows normal write operations. This segmentation provides strong data integrity protection for critical information without requiring complex protection mechanisms across the entire storage system.
Solution Approach 2:
The memory areas are pre-configured with different protection attributes during system initialization. The first memory area is set up with read-only protection before data storage begins, ensuring that critical accident data cannot be altered or deleted. This preliminary configuration simplifies ongoing data management by establishing protection rules in advance rather than implementing complex real-time protection logic.
3Productivity
If sensing data is compressed to improve storage efficiency, then storage capacity is improved, but measurement precision deteriorates
Solution Approach 1:
Critical sensing data in the first memory area is stored without compression to preserve full measurement precision and data accuracy required for accident responsibility determination. Non-critical sensing data in the second memory area can be compressed to improve overall storage capacity. This segmentation approach ensures that data accuracy is maintained for essential accident information while still achieving storage efficiency improvements.
Solution Approach 2:
Different data quality levels are applied to different memory areas. The first memory area maintains high data quality with no compression for critical accident-related sensing data, while the second memory area accepts lower quality compressed data for non-critical information. This local quality differentiation preserves measurement precision where needed while improving overall storage capacity.
Data Source
AI summary
A storage device includes a nonvolatile memory including a memory cell array and a storage controller configured to receive event data and sensing data from an external device, and store the sensing data in different areas of the memory cell array based on the event data. The memory cell array includes a first memory area configured to store first sensing data from among the sensing data, the first sensing data being associated with a preset event and a second memory area configured to store second sensing data from among the sensing data, the second sensing data being associated with a current event not corresponding to the preset event. A first number of bits stored in each of first memory cells included in the first memory area may be less than a second number of bits stored in each of second memory cells included in the second memory area.