SIM Toolkit Phone Book Update via Cell Broadcast
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Solution Overview
Problem
Existing mobile communications devices require advanced handsets and complex operations to access location-based services, limiting their use due to the need for location services and internet capabilities, and existing solutions like SMS cell broadcast channels are inefficient in updating phone book entries.
Innovation Solution
Utilizing the Cell Broadcast channel to update phone book entries with location-based service information, where service identifiers like 'Local' trigger updates in the SIM toolkit, allowing for transparent operation without requiring location services or internet capabilities, and employing a look-up table or message identifier system to efficiently manage and decode broadcast messages.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of information
If WAP or i-Mode location-based services are used, then location-based information can be accessed, but the operation becomes complex and requires advanced handsets with location services and internet capabilities
Solution Approach 1:
The invention extracts the location-based service functionality from complex WAP/i-Mode systems and implements it directly in the SIM card's phone book. The SIM card autonomously receives broadcast messages and updates local service numbers without requiring the handset to have location services or internet capabilities, thereby removing the complexity burden from the device.
Solution Approach 2:
The SIM card performs self-service by automatically receiving broadcast messages containing local service numbers and updating its own phone book entries. This autonomous operation eliminates the need for user intervention or complex handset processing, allowing basic handsets to access location-based services seamlessly.
2Loss of information
If SMS cell broadcast channels are used for updating phone book entries, then location-based service numbers can be transmitted, but the update process becomes inefficient
Solution Approach 1:
The invention segments the phone book update process by dedicating specific fields (service identifier fields) within phone book entries to store broadcast message identifiers. This segmentation allows the SIM card to efficiently match received broadcast messages with corresponding phone book entries using predefined matching rules, significantly improving update efficiency compared to traditional SMS methods.
Data Source
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AI summary
A mobile communications device includes: a telephone directory storage unit for storing a telephone directory; a comparator for comparing a service identifier included in a received message with a service identifier stored in the telephone directory; and an update unit for updating the telephone number stored in the telephone directory. If the service identifier corresponding to the telephone number received in the message matches the service identifier stored in the telephone directory, the update unit updates the telephone number stored in the telephone directory with the received telephone number.