Cellular Handover Area Location Accuracy
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Solution Overview
Problem
Existing methods for determining the geographical location of cellular devices in traffic information systems are limited by the large geographical area covered by each cell, leading to inaccurate location determination and high costs due to network loading from active monitoring techniques.
Innovation Solution
A method and apparatus that determine the handover area by modeling the effective cell-area and penumbra area between two cells, using topological relationships and signal intensity parameters, to accurately predict the location of a cellular device during handover events, thereby improving location accuracy and reducing costs.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the location is determined based on the network cell in which the cellular phone is located, then the location determination is simple and low-cost, but the location accuracy is poor due to the large geographical area covered by each cell
Solution Approach 1:
The patent segments the cell area into multiple handover areas based on different topological relationships between cells. Instead of treating the entire cell as one location zone, it divides it into smaller handover areas (HA1, HA2, HA3, HA4) with different geometric characteristics, allowing more precise location determination within each segment while maintaining overall system simplicity
Solution Approach 2:
The patent pre-calculates and stores handover area parameters (effective radii, extension widths, penumbra widths) for all possible topological relationships between cells before actual location determination. This preliminary computation of geometric parameters allows the system to quickly determine location accuracy without complex real-time calculations
2Measurement precision
If active monitoring techniques are used to determine vehicle locations, then the location accuracy is improved, but the network loading and costs increase significantly
Solution Approach 1:
The patent utilizes handover events that occur naturally during normal cellular network operation to determine device locations. Instead of requiring active monitoring or special positioning functions, the system passively captures location information from routine handover signaling between cells, eliminating the need for additional network resources or energy-consuming active monitoring mechanisms
Solution Approach 2:
The patent uses handover areas as an intermediary concept that bridges the gap between cell-level location data and precise device positioning. By introducing handover areas with calculated geometric parameters (effective radii, extension widths), the system transforms ordinary cell identification data into more accurate location information without requiring direct active monitoring of device positions
Data Source
AI summary
According to an embodiment of the invention, there is disclosed a method for geographically locating a cellular phone. The method comprises: determining an effective cell-area for each of a first cell and a second cell in a cellular network; and determining a handover area within which the cellular phone is likely to be located when control of the cellular phone is transferred from the first cell to the second cell; wherein the determination of the handover area and the effective cell-area for each of the first cell and the second cell are made based on a topological relationship between the first cell and the second cell. Further related apparatus embodiments are also disclosed.