Base-Station Control Apparatus for Millimeter-Wave Position Estimation
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Solution Overview
Problem
Existing wireless position estimation systems in millimeter-wave communications lack the ability to select the most suitable base-station apparatus for accurate position estimation of wireless terminals, leading to reduced accuracy.
Innovation Solution
A base-station control apparatus that selects sub-anchor candidates within a determined range from the main anchor base-station, estimates arrival direction vectors based on signal reception qualities, and calculates angles to choose optimal sub-anchors for improved position estimation of wireless terminals.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If predetermined wireless base-station apparatuses are used for position estimation, then the system is simple to implement, but the position estimation accuracy deteriorates
Solution Approach 1:
The system changes the parameter of base-station selection from fixed/predetermined to dynamic/adaptive based on signal conditions. The base-station control apparatus evaluates signal reception qualities and arrival direction vectors in real-time to select optimal base-stations for position estimation, thereby improving accuracy without requiring a completely new system architecture
Solution Approach 2:
The position estimation system performs self-optimization by automatically selecting the most suitable base-stations based on current signal conditions. The base-station control apparatus autonomously evaluates reception qualities and geometric relationships, eliminating the need for manual configuration or external intervention to maintain optimal estimation accuracy
2Measurement precision
If more base-station apparatuses are used for position estimation, then the position estimation accuracy improves, but the system complexity and processing load increase
Solution Approach 1:
Instead of uniformly using all base-stations or a fixed number, the system applies local quality by selecting specific base-stations that exhibit optimal local characteristics for position estimation. The selection is based on individual base-station signal reception qualities and their geometric relationships with the terminal, ensuring that only the most suitable base-stations are utilized
Solution Approach 2:
The system employs partial action by using only the necessary subset of base-stations for accurate position estimation rather than all available base-stations. By evaluating signal reception qualities and arrival direction vectors, the system identifies the minimum required number of base-stations that provide sufficient geometric diversity and signal quality for accurate positioning
3Measurement precision
If base-station selection is performed without considering signal reception quality, then the system is simpler, but the position estimation accuracy deteriorates
Solution Approach 1:
The base-station control apparatus implements feedback by continuously monitoring signal reception qualities from multiple base-stations and using this information to dynamically select the optimal base-stations for position estimation. The reception quality metrics feed back into the selection process, creating a closed-loop system that adapts to changing signal conditions
Solution Approach 2:
The system performs preliminary evaluation of base-station signal reception qualities and arrival direction vectors before conducting position estimation. This preliminary action identifies and selects the most suitable base-stations in advance, ensuring that the position estimation process uses only high-quality data from optimally positioned base-stations
Data Source
AI summary
A base-station control apparatus includes: a sub-anchor candidate selector that selects sub-anchor candidates from base-station apparatuses different from a first base-station apparatus connected to a wireless terminal; an arrival-direction estimator that estimates arrival direction vectors with respect to the first base-station apparatus and the candidates, based on reception qualities of signals that the first base-station apparatus and the candidates receives from the wireless terminal; a sub-anchor selector that selects a sub-anchor from the candidates, based on angles made by the estimated arrival direction vectors and line segments each having end points at positions of the first base-station apparatus and the corresponding candidate; and a position estimator that estimates a position of the wireless terminal, based on the arrival direction vectors with respect to the first base-station apparatus and the sub-anchor.