WLAN Localization Database Update via Experience Messages
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Solution Overview
Problem
Current WLAN-based localization systems face challenges in accurately and reliably localizing terminal devices in urban areas with high visitor frequency due to signal shielding by buildings and dynamic changes in infrastructure, leading to outdated reference data and decreased localization quality.
Innovation Solution
An apparatus and method for updating a reference database using experience messages generated by mobile terminal devices, which determine and store changes in transmitter identifications, allowing for the addition of new and removal of obsolete radio transmitters, ensuring the database remains current and accurate.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If WLAN-based localization systems use reference databases with static transmitter identification data, then the system structure remains simple, but the localization accuracy deteriorates in dynamic urban environments where infrastructure changes frequently
Solution Approach 1:
The patent implements dynamic updating of the reference database by continuously monitoring transmitter identification data from mobile terminal devices. The system transitions from static reference data to dynamically updated reference data, allowing the localization system to adapt to changing urban infrastructure while maintaining manageable complexity through automated update mechanisms.
Solution Approach 2:
The system employs feedback mechanisms where mobile terminal devices continuously report received transmitter identification data to the localization system. This feedback loop enables the reference database to be automatically updated with current infrastructure information, improving localization accuracy without requiring manual intervention or complex system reconfiguration.
2Reliability
If the reference database is updated frequently to reflect infrastructure changes, then the localization reliability improves, but the data processing load and system complexity increase
Solution Approach 1:
Mobile terminal devices automatically perform the task of monitoring and reporting transmitter identification changes without requiring manual intervention. The system uses the devices themselves to collect and report data, eliminating the need for dedicated survey equipment or manual database updates, thereby improving reliability while keeping processing requirements manageable.
Solution Approach 2:
The system implements continuous monitoring and updating of the reference database through ongoing data collection from mobile terminal devices. Rather than periodic manual updates, the system maintains continuous awareness of infrastructure changes, ensuring high localization reliability while distributing the processing load over time across multiple devices.
3Loss of information
If experience messages are generated and processed for every detected transmitter change, then the database remains highly current, but the communication overhead and processing time increase
Solution Approach 1:
The system extracts and processes only the essential information from experience messages - specifically, changes in transmitter identification data. Rather than processing complete raw data sets, the system identifies and processes only the relevant changes, maintaining information freshness while minimizing communication overhead and processing time through selective data extraction.
Data Source
AI summary
At a current position, a measurement packet is determined by a mobile terminal device at a measurement time. The measurement packet includes transmitter identifications of radio transmitters receivable at the current position of the mobile terminal device at the measurement time. By means of reference measurement packets provided to the mobile terminal device, the mobile terminal device itself can determine its current position. Additionally, a deviation of the determined transmitter identifications of the measurement packet from reference transmitter identifications of the reference measurement packets is determined. If a deviation of the reference transmitter identifications from the transmitter identifications determined at the current position is detected, experience messages can be generated that can again result in an update measure as, for example, updating the reference database by adding new transmitter identifications to the reference database and/or removing obsolete reference transmitter identifications from the reference database.