RSTD Measurement Correction via Helper UE Data Fusion
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Solution Overview
Problem
The existing wireless communication systems face challenges in accurately estimating the location of a User Equipment (UE) due to limitations in reference signal time difference (RSTD) measurement accuracy, particularly in observed time difference of arrival (OTDOA) methods.
Innovation Solution
A method and device for performing RSTD measurement-related operations in a wireless communication system, where a user equipment (UE) receives and corrects RSTD measurement information from helper UEs (H-UEs) and transmits the corrected information to a base station, using techniques such as linear combination or weighted average, to enhance location estimation accuracy.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a UE performs RSTD measurement using only its own measurement, then the measurement process is simple, but the RSTD estimation accuracy is insufficient for improved location estimation performance
Solution Approach 1:
The patent combines RSTD measurements from multiple UEs (target UE and helper UEs) into a single corrected RSTD value for the target UE. The location server collects RSTD measurements from multiple UEs and combines them using linear combination or weighted average methods, merging multiple measurement results to achieve higher accuracy than any single UE could achieve alone.
Solution Approach 2:
The location server acts as an intermediary that collects RSTD measurements from multiple UEs, processes them through correction algorithms, and generates the final corrected RSTD values. This intermediary processing enables accurate location estimation without requiring complex inter-UE coordination or direct UE-to-UE communication for measurement sharing.
2Measurement precision
If RSTD measurement information is shared among multiple UEs, then RSTD estimation accuracy is improved, but the system complexity and information processing requirements increase
Solution Approach 1:
The patent extracts only the necessary RSTD measurement information from multiple UEs and processes it at the location server. Instead of sharing all raw measurement data among UEs, the system extracts relevant RSTD values and their associated quality metrics, reducing information overhead while maintaining the ability to perform accurate combined estimation.
Solution Approach 2:
The patent transforms raw RSTD measurements into corrected RSTD values by changing the parameter representation through mathematical operations (linear combination, weighted average). This parameter transformation consolidates multiple measurements into a single corrected value, reducing information complexity while preserving estimation accuracy.
3Measurement precision
If corrected RSTD measurement information is transmitted to base station, then location estimation performance is improved, but the transmission and processing time increases
Solution Approach 1:
The location server performs preliminary correction processing of RSTD measurements before final location estimation. By pre-processing the measurements and generating corrected values in advance, the system reduces the time required for final location calculation, as the complex combination and correction operations are already completed when measurements are received from multiple UEs.
Data Source
AI summary
An embodiment of the present invention relates to a method for executing a reference signal time difference measurement (RSTD) measurement-related operation by a terminal in a wireless communication system, which is a measurement-related operation executing method comprising the steps of: receiving RSTD measurement information from two or more helper UEs (H-UEs); using the received RSTD measurement information to correct the RSTD measurement information measured by the terminal; and transmitting the corrected RSTD measurement information to a base station.