Mobile Terminal Positioning via Speed Distribution Averaging
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Solution Overview
Problem
Conventional methods for localizing mobile radio terminals without GPS or in GPS-denied areas suffer from limited accuracy due to estimation errors caused by shadowing and multipath propagation, leading to potential delays in emergency response.
Innovation Solution
A device and method that utilize previous knowledge and statistical properties, such as speed distribution, to improve position estimation by averaging and extrapolating estimated positions, with weighting based on reliability and prior knowledge of possible speeds.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If conventional localization methods using radio cell transmission mast position are used, then the system is simple and easy to operate, but the positioning accuracy is limited
Solution Approach 1:
The patent applies preliminary action by pre-calculating and storing probability distribution functions for propagation time errors in a database before actual positioning occurs. These pre-computed statistical models are then retrieved and applied during positioning to correct raw measurements, thereby improving accuracy without adding real-time computational complexity to the positioning system.
Solution Approach 2:
The patent introduces an intermediary element - a database containing pre-calculated probability distribution functions that act as a mediator between the raw propagation time measurements and the final position estimate. This database serves as a lookup table that translates complex statistical corrections into simple position adjustments, improving accuracy while maintaining system simplicity.
2Measurement precision
If additional information such as timing advance and neighboring base station measurements are used, then positioning accuracy is improved, but the quantity of data and processing requirements increase
Solution Approach 1:
The patent changes the parameter representation by transforming multiple raw measurement parameters (timing advance, neighboring base station signals) into a single propagated position estimate with an associated probability distribution. This parameter transformation reduces the data volume needed for final positioning while maintaining the benefits of using multiple measurement sources.
Solution Approach 2:
The patent merges multiple measurement sources (timing advance values from different base stations, neighboring cell measurements) into a single combined position estimate. By combining these measurements and applying statistical corrections uniformly, the system achieves improved accuracy without needing to process and store each individual measurement separately throughout the positioning process.
3Measurement precision
If statistical properties and speed distribution are incorporated into position estimation, then positioning accuracy is enhanced, but the computational complexity increases
Solution Approach 1:
The patent applies preliminary action by pre-computing and storing probability distribution functions for speed and propagation time errors in a database before positioning operations. These pre-calculated statistical models are then simply retrieved and applied during positioning, enabling sophisticated statistical corrections without imposing heavy computational burdens during actual position estimation.
Solution Approach 2:
The system applies self-service by using its own historical measurement data to generate the probability distribution functions that are then used to correct future measurements. The system serves itself by building its own statistical models from operational data, eliminating the need for external calibration or complex real-time computational resources.
Data Source
AI summary
The device has a transmitting device (110) for transmitting two estimation positions to different points based on radio signals from basestation-transceivers, and a determination device (120) provided for determining speed between the estimation positions under observation of velocity distribution. A computing device (140) is provided for computing a delay position of a mobile terminal under usage of the estimation positions, speed and the points. Independent claims are also included for the following: (1) a method for estimating a delay position of a mobile terminal in a mobile network (2) a computer program for estimating a delay position of a mobile terminal in a mobile network.