Temperature-Adaptive NAND Reclaim Scheduling for Data Retention
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Solution Overview
Problem
Existing nonvolatile memory devices face performance deterioration, increased power consumption, and wear amplification due to improper timing of reclaim, garbage collection, and trim operations, which are not adjusted based on temperature considerations.
Innovation Solution
A storage device with temperature sensors to measure and adjust the timing of reclaim, garbage collection, and trim operations based on temperature changes, using a memory controller to determine equivalent temperatures and adjust operation periods accordingly.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If reclaim, garbage collection, and trim operations are performed at fixed intervals regardless of temperature, then operational simplicity is maintained, but data retention reliability deteriorates due to temperature-induced retention changes
Solution Approach 1:
The patent applies dynamics by transitioning from fixed-interval reclaim operations to dynamic interval adjustment based on temperature conditions. The memory controller continuously monitors temperature and adjusts the reclaim operation period accordingly, making the system adaptive to environmental changes that affect data retention characteristics of the nonvolatile memory device.
Solution Approach 2:
The patent implements feedback mechanisms where the memory controller receives temperature information from temperature sensors and uses this feedback to adjust reclaim operation timing. The controller determines whether to perform reclaim operations based on temperature thresholds and retention characteristics, creating a closed-loop control system that optimizes operations based on real-time thermal conditions.
2Reliability
If reclaim operations are performed more frequently to ensure data retention, then reliability improves, but power consumption increases
Solution Approach 1:
The patent changes the operational parameters of reclaim operations based on temperature conditions. Instead of using a fixed reclaim interval, the system adjusts the interval duration according to temperature measurements and corresponding retention characteristics. This allows the system to extend reclaim intervals during low-temperature conditions where retention is naturally better, thereby reducing power consumption while maintaining reliability.
3Reliability
If reclaim operations are performed frequently to maintain data retention, then reliability improves, but wear amplification increases
Solution Approach 1:
The patent dynamically changes the reclaim operation frequency parameter based on temperature conditions. By adjusting the reclaim interval according to temperature-dependent retention characteristics, the system performs reclaim operations only when necessary, reducing unnecessary write-erase cycles that contribute to wear amplification while still ensuring data retention reliability is maintained.
4Productivity
If temperature-based adjustment of reclaim operations is implemented, then operational efficiency improves, but device complexity increases due to additional sensors and control logic
Solution Approach 1:
The patent applies universality by integrating temperature sensing functionality into the existing memory controller and utilizing the same control logic for multiple purposes: temperature monitoring, retention characteristic determination, and reclaim operation scheduling. This multi-functional approach allows temperature-based optimization without requiring entirely separate control systems, thereby limiting the increase in overall device complexity.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
Improves the efficiency of reclaim, garbage collection, and trim operations by considering data retention based on temperature, reducing unnecessary operations and enhancing device performance and longevity.
Implementation Method 1
one or more temperature sensors configured to generate first temperature information by periodically measuring, in a time period between a first time point and a second time point, at least one temperature of at least one memory area
Data Source
AI summary
A storage device including a nonvolatile memory device and a memory controller and an operating method of the storage device are provided. The nonvolatile memory device includes a plurality of memory areas each including one or more memory cells, one or more temperature sensors configured to generate first temperature information by measuring at least one temperature of at least one memory area from among the plurality of memory areas periodically between a first time point and a second time point, and a buffer configured to store the first temperature information.