Network Node Timing Uncertainty Determination for LTE Positioning
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Solution Overview
Problem
Current LTE positioning methods face challenges in accurately determining the uncertainty of timing measurements for OTDOA positioning, particularly in environments where signal strength and interference are high, leading to reduced positioning accuracy and increased UE complexity.
Innovation Solution
A network node is configured to estimate timing measurement uncertainty using available measurements such as A-GPS, AoA, RSRP, and RSRQ, and create timing measurement maps to derive a smaller RSTD uncertainty, ensuring the search window complies with standardized maximum limits, thereby improving positioning accuracy and reducing UE complexity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If traditional LTE positioning methods are used to determine timing measurement uncertainty, then positioning can be performed, but positioning accuracy is reduced due to high signal strength and interference
Solution Approach 1:
The patent introduces an intermediary mechanism (timing measurement uncertainty determination based on multiple measurements including A-GPS, AoA, RSRP, and RSRQ) that mediates between the harmful signal interference and the positioning accuracy requirement. This intermediary process filters and processes multiple measurement types to derive a more accurate timing measurement uncertainty value that compensates for the harmful effects of signal interference in challenging environments.
Solution Approach 2:
The patent changes the parameters used for uncertainty determination from traditional single measurement methods to a multi-parameter approach incorporating A-GPS measurements, AoA measurements, RSRP measurements, and RSRQ measurements. By changing the measurement parameters and combining multiple parameter types, the system achieves improved positioning accuracy even in environments with high signal strength and interference.
2Measurement precision
If traditional timing measurement uncertainty determination is used, then the process is simpler, but positioning accuracy is reduced
Solution Approach 1:
The patent merges multiple measurement types (A-GPS, AoA, RSRP, RSRQ) into a unified timing measurement uncertainty determination process. By combining these different measurement sources and processing them together through a single uncertainty determination mechanism, the patent achieves improved positioning accuracy while managing UE complexity through integrated processing rather than separate complex systems for each measurement type.
Solution Approach 2:
The patent creates a universal timing measurement uncertainty determination mechanism that can process multiple types of measurements (A-GPS, AoA, RSRP, RSRQ) through a single multi-functional process. This universal approach allows the system to leverage different measurement types as needed while maintaining a unified processing architecture, improving positioning accuracy without proportionally increasing UE complexity.
3Reliability
If larger search windows are used to accommodate timing uncertainty, then measurement robustness is improved, but processing time and complexity increase
Solution Approach 1:
The patent performs preliminary determination of timing measurement uncertainty using multiple measurements (A-GPS, AoA, RSRP, RSRQ) before the actual positioning measurement process. By calculating the uncertainty value in advance based on available measurements, the system can set an appropriately sized search window that provides sufficient robustness without being excessively large, thereby reducing processing time while maintaining measurement reliability.
Solution Approach 2:
The patent implements a dynamic search window sizing mechanism where the window size is adjusted based on the determined timing measurement uncertainty. Rather than using a fixed large search window for all cases, the system dynamically sets the window size proportional to the calculated uncertainty, ensuring adequate robustness for each specific measurement scenario while minimizing unnecessary processing time associated with oversized windows.
Data Source
AI summary
A network node such as a positioning node, and a related method of determining an uncertainty of a timing measurement used for positioning of a wireless device are disclosed. The method includes estimating a timing measurement uncertainty, and determining if an uncertainty reducing measurement is available. If an uncertainty reducing measurement is available, the method also comprises determining a timing measurement uncertainty based on the estimated timing measurement uncertainty and the uncertainty reducing measurement.