eUICC Profile Memory Wear Control for Reliable SIM Provisioning
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Solution Overview
Problem
Remote SIM provisioning to eUICC leads to increased wear of profile memory, potentially causing failure of profiles or the entire eUICC, thereby reducing the reliability of the process.
Innovation Solution
Implement a method for remote SIM provisioning that includes verifying a wear measure indicator of the profile memory before performing provisioning measures, allowing the system to abort or tailor the provisioning based on the wear grade, and updating the indicator after the measure.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If remote SIM provisioning operations are performed frequently to enable flexible profile management, then the adaptability and functionality of the eUICC are improved, but the wear of the nonvolatile profile memory increases, leading to reduced reliability and potential failure
Solution Approach 1:
The system performs preliminary verification of the wear measure indicator before executing remote SIM provisioning operations. By checking the wear level in advance, the system can prevent operations that would exceed memory wear thresholds, thereby avoiding memory failure while still allowing flexible profile management within safe operational limits.
Solution Approach 2:
The system implements a feedback mechanism by continuously monitoring the wear measure indicator and using this information to control subsequent provisioning operations. The wear indicator provides real-time feedback on memory health, enabling the system to adjust its operations dynamically - allowing operations when wear is low and preventing them when wear approaches critical levels.
2Productivity
If the profile memory is used extensively for multiple profile downloads and updates, then the productivity and service capability of the eUICC are improved, but the memory wear accumulates, increasing the risk of memory failure
Solution Approach 1:
The system performs partial provisioning operations by verifying wear levels before each operation and aborting or tailoring operations when wear thresholds are approached. This partial action approach allows the system to maximize productive operations within safe wear limits, performing as many profile downloads and updates as possible without exceeding the memory's wear capacity.
Solution Approach 2:
The wear measure indicator acts as a cushioning mechanism by providing advance warning of approaching memory failure. This allows the system to take preventive actions before actual failure occurs, such as preventing new provisioning operations or alerting users to replace the eUICC, thereby cushioning against the harmful effects of excessive wear.
3Device complexity
If no wear verification is performed before provisioning operations, then the device complexity and operational overhead are reduced, but the risk of memory failure and loss of service continuity increases
Solution Approach 1:
The system replaces complex mechanical wear monitoring and management mechanisms with a simplified electronic verification approach. Instead of implementing complex wear tracking hardware or sophisticated algorithms, the system uses a straightforward wear measure indicator verification process that can be implemented through simple software checks, thereby maintaining low device complexity while ensuring service continuity.
Data Source
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AI summary
A method for remote SIM provisioning to an eUICC, which comprises at least one profile memory (3) embodied as a nonvolatile memory NVM, comprising the steps: - perform a remote SIM provisioning measure effecting the profile memory (3) by one or several write or/and erase operations; characterized by the step: - before the step to perform a remote SIM provisioning measure, verify a wear measure indicator (1) indicative of a grade of wear of the profile memory (3), and control the remote SIM provisioning measure according to a result of verifying the wear measure indicator (1).