UIM Card PRL Update via Text Message Construction
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Solution Overview
Problem
Current methods for updating a preferred roaming list (PRL) in a UIM card are costly and restrictive, as they require a live network-activated card and may not allow specification of PRL data, making them unsuitable for instrument testing and requiring expensive 'white cards' or manufacturer interface access.
Innovation Solution
A method that constructs a PRL updating text message to update the PRL file, allowing the use of a discarded defaulting card by reading and writing data using UIM card instructions, simulating a mobile operator's update process without needing a live network or special interfaces.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a live network-activated UIM card is used to update PRL, then the PRL can be updated to the latest version, but the method cannot specify custom PRL contents and requires network activation
Solution Approach 1:
The patent copies the PRL updating text message format and protocol from the live network update mechanism, allowing custom PRL data to be packaged in the same standardized message structure. This enables instrument testing to use discarded cards with custom PRL while maintaining protocol compatibility and reliable update processing
Solution Approach 2:
The patent segments the PRL data into structured text message fields that can be independently configured. The PRL information is divided into recognizable message components that follow the standard updating protocol, allowing custom data to be inserted while maintaining message integrity and proper parsing by the UIM card
2Adaptability or versatility
If a white card is used to specify PRL files, then custom PRL contents can be set, but the cost increases significantly to about 100 yuan per card
Solution Approach 1:
The patent enables the use of discarded, defaulting UIM cards that would otherwise be worthless for instrument testing purposes. By applying the PRL updating text message method, these inexpensive discarded cards can be programmed with custom PRL data, replacing the need for expensive white cards while maintaining full functionality for testing
Solution Approach 2:
The patent changes the state of discarded UIM cards from unusable to functional by introducing custom PRL data through text message updates. The card's PRL parameter is modified from its default empty or network-provided state to a customized state containing instrument-specific roaming information, transforming low-value cards into suitable test instruments
3Adaptability or versatility
If manufacturer interface is used to write PRL file, then custom PRL data can be written, but manufacturer permission and interface access are required
Solution Approach 1:
The patent makes the PRL updating text message method universally applicable to all UIM cards that support standard text message processing, regardless of manufacturer. This universal approach eliminates the need for manufacturer-specific interfaces or permissions, as the method uses the standardized message protocol that all UIM cards are designed to accept for network updates
Data Source
AI summary
Provided is a method for updating a preferred roaming list of a user identity module card, the method comprising: reading preferred roaming list updating data; packing the preferred roaming list updating data in a preferred roaming list updating text message; and writing the preferred roaming list updating text message into a text message file of a user identity module card.