Wireless Terminal Phase Difference Reporting for Location Estimation
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Solution Overview
Problem
Existing wireless communication systems face challenges in accurately and efficiently measuring distances and positions between wireless devices using phase differences of reference signals, particularly due to overhead and scheduling complexities in transmitting and receiving these signals.
Innovation Solution
A method where a terminal measures phase differences of downlink positioning reference signals from multiple base stations and reports them to a serving base station through a single uplink transmission, allowing the serving base station to estimate the location of the terminal, thereby minimizing overhead and improving measurement accuracy.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the terminal transmits uplink positioning reference signals to multiple neighboring base stations for location estimation, then the location measurement accuracy can be improved, but the overhead of the terminal and the scheduling complexity of the network increase
Solution Approach 1:
The patent combines multiple positioning reference signal transmissions into a single uplink transmission. The terminal measures phase differences from multiple base stations and reports all measurements in one consolidated UL PRS to the serving base station, which then performs triangulation. This merging approach maintains location measurement accuracy while significantly reducing terminal overhead and network scheduling complexity compared to separate transmissions to each base station.
Solution Approach 2:
The serving base station acts as an intermediary that receives positioning reference signals from the terminal and also receives information from neighboring base stations. It consolidates the phase difference measurements and performs the triangulation calculation to determine terminal location. This intermediary role eliminates the need for the terminal to directly communicate with multiple neighboring base stations, reducing complexity while maintaining measurement precision.
2Loss of information
If the terminal transmits uplink positioning reference signals to multiple neighboring base stations, then comprehensive location data can be obtained, but inaccurate distance measurement occurs due to terminal transmission to non-serving base stations
Solution Approach 1:
The serving base station serves as an intermediary that receives positioning data from the terminal and coordinates with neighboring base stations. Instead of the terminal directly transmitting to neighboring base stations (which causes measurement inaccuracies), the serving base station collects necessary information from neighbors and combines it with terminal measurements, ensuring accurate distance calculation while maintaining complete location data.
Solution Approach 2:
The patent segments the positioning measurement process into two parts: the terminal measures phase differences from downlink signals received from multiple base stations, and the serving base station performs the distance calculation and triangulation using these measurements along with information from neighboring base stations. This segmentation prevents the terminal from directly transmitting to non-serving base stations, avoiding measurement inaccuracies while preserving data completeness.
Data Source
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AI summary
A method for a terminal to transmit and receive signals for position estimation in a wireless communication system according to an embodiment of the present invention comprises the steps of: receiving a downlink (DL) positioning reference signal (PRS) from each of a serving base station and reference base stations; measuring phase differences between sinusoidal components included in the DL PRSs for each of the serving base station and the reference base stations; generating an uplink (UL) PRS on the basis of the measured phase differences; and transmitting the UL PRS to the serving base station, wherein the terminal may report the phase difference measured for the serving base station and the phase differences measured for the reference base stations through the transmission of the UL PRS to the serving base station.