Positioning Reference Signal Calibration for Timing Error Correction
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Solution Overview
Problem
Timing errors in wireless communication systems, such as symbol timing offset, carrier frequency offset, and phase noise, degrade the precision and accuracy of terminal device positioning in cellular communication systems.
Innovation Solution
The system employs an apparatus that receives calibration configuration information to communicate positioning reference signals with specific patterns designed to reduce different types of timing errors. These patterns define varying numbers of frequency and time resource elements, allowing for tailored correction of timing errors like symbol timing offset, carrier frequency offset, and phase noise.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If multiple positioning reference signals with different patterns are communicated to reduce different types of timing errors, then timing error reduction capability is improved, but device complexity and signaling overhead increase
Solution Approach 1:
The patent segments the positioning reference signal into multiple distinct patterns, where each pattern is specifically designed to address different types of timing errors (e.g., first pattern for transmission timing error, second pattern for reception timing error). This segmentation allows the system to tackle complex timing error reduction by breaking it down into manageable, specialized signal components.
Solution Approach 2:
Each positioning reference signal pattern is optimized with specific local qualities tailored to its intended error correction function. The first pattern may have specific time-domain characteristics optimized for transmission timing error, while the second pattern has different characteristics optimized for reception timing error. This local optimization enables each signal pattern to excel at its specific correction task.
2Measurement precision
If positioning reference signals with tailored patterns are used to reduce timing errors, then positioning precision is improved, but loss of time for calibration increases
Solution Approach 1:
The patent implements preliminary calibration actions by communicating positioning reference signals with specific patterns before actual positioning measurements are performed. The network element or terminal device performs timing error calibration using dedicated calibration patterns, establishing corrected timing parameters in advance. This preliminary calibration ensures that subsequent positioning measurements benefit from pre-corrected timing errors, improving precision without adding time to the actual positioning process.
3Measurement precision
If dedicated calibration signals are communicated for timing error reduction, then timing error accuracy is improved, but use of communication resources increases
Solution Approach 1:
The patent designs positioning reference signal patterns that serve multiple functions simultaneously. The same calibration patterns used for timing error reduction are also utilized for positioning measurements, eliminating the need for completely separate dedicated calibration signals. This multi-functionality allows the system to achieve accurate timing error correction while reusing communication resources, thereby reducing overall energy and resource consumption.
Data Source
AI summary
A method for calibrating timing errors to improve positioning accuracy includes receiving, from a network element, calibration configuration information for communicating at least one positioning reference signal; communicating, during a positioning session and on the basis of the received calibration configuration information, a first positioning reference signal according to a first positioning reference signal pattern; and communicating, during the positioning session or during another positioning session and on the basis of the received calibration configuration information, a second positioning reference signal according to a second positioning reference signal pattern, wherein the second number of frequency resource elements is smaller than the first number of frequency resource elements and/or wherein the second number of time resource elements is greater than the first number of time resource elements.