Mobile Subscriber Location Using Pre-calculated Radio Maps
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Solution Overview
Problem
Existing methods for locating mobile radio subscribers in a mobile radio network are not accurate enough, as they rely on wave propagation models that do not account for specific topographic parameters, leading to large potential areas of location uncertainty.
Innovation Solution
Using pre-calculated data from radio network planning tools, such as the Atoll program, to create a multi-server map that accounts for topographic characteristics, height of base stations, and area development, allowing for precise allocation of mobile subscribers based on receive field strength measurements.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If wave propagation models (e.g., COST HATA) are used to calculate position from RSCP or Ec/No measurement values, then a coarse estimation of the mobile radio subscriber's position can be obtained, but the potential whereabouts remains undesirably large due to lack of topographic parameter consideration
Solution Approach 1:
The patent applies preliminary action by pre-calculating expected measurement values using radio network planning tools (like Atoll) that incorporate topographic parameters, base station heights, and area development characteristics. These pre-calculated values are stored in a database before actual positioning occurs, allowing rapid comparison with real measurements without performing complex wave propagation calculations in real-time, thus achieving high accuracy while maintaining low computational complexity during operation
Solution Approach 2:
The patent uses copying by creating a virtual model (multi-server map) that replicates the physical radio environment with pre-calculated expected measurement values for different geographic locations. Instead of performing complex physical calculations, the system copies the environmental characteristics into a database that can be quickly queried and compared against actual measurements, significantly reducing computational requirements while maintaining accuracy
2Measurement precision
If pre-calculated data from radio network planning tools is used to create a multi-server map, then location accuracy is significantly improved by accounting for topographic characteristics, but the initial setup and data processing complexity increases
Solution Approach 1:
The patent applies self-service by enabling the system to automatically import and process multi-server map data from standard radio network planning tools without requiring manual configuration. The system autonomously processes the pre-calculated expected measurement values, organizes them into the required format, and integrates them into the positioning algorithm, reducing the burden on system operators while achieving high accuracy
3Measurement precision
If traditional wave propagation models are used without topographic parameters, then the system is simple to implement, but the location accuracy is insufficient for precise subscriber localization
Solution Approach 1:
The patent applies taking out by extracting only the essential expected measurement values from complex radio network planning calculations and storing them in a simplified database format. This extraction process separates the critical positioning information from the complex computational models, allowing the system to achieve high accuracy by comparing actual measurements against pre-extracted expected values without processing the full complexity of wave propagation models in real-time
Data Source
AI summary
The present invention relates to a method for locating at least one mobile radio subscriber in a mobile radio network. The mobile radio subscriber transmits a measurement report that includes an itemization identifying at least two transmitting stations. A value correlated with the receive field strength of a signal from the transmitting stations is allocated to each transmitting station. A table is organized according to geographic units of a presettable area. A pre-calculated value correlated with the receive field strength of a signal from a transmitting station is allocated to each transmitting station. The transmitting stations are organized according to the values correlated with the receive field strength of the signal from the respective transmitting station. The location of the mobile radio subscriber is determined based on the geographic unit meeting at least one presettable criterion.