Atmospheric Delay Correction for NTN Node Location

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Solution Overview

Problem

Current wireless communication systems, particularly 5G NR, face challenges in accurately determining the location of user equipment (UE) due to atmospheric delays caused by the ionosphere and troposphere when signals travel from non-terrestrial network (NTN) nodes to the UE.

Innovation Solution

A method where user equipment (UE) receives reference signals from a set of NTN nodes, measures these signals, and calculates atmospheric delays associated with the ionosphere and troposphere. The UE then uses these calculations to determine its location and transmit it, effectively correcting for atmospheric impacts on signal travel.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Measurement precision

If reference signals are transmitted from NTN nodes to determine UE location, then location determination capability is provided, but atmospheric delays from ionosphere and troposphere cause measurement errors

Engineering Contradiction:
Improvelocation determination accuracyVSAvoidatmospheric delays
Core Design Contradiction:
Measurement precisionVSObject-affected harmful factors

Solution Approach 1:

The patent introduces atmospheric delay correction as an intermediary factor that mediates between the raw signal measurements and the final location calculation. By calculating and applying correction values for ionospheric and tropospheric delays, the system compensates for the harmful atmospheric effects without changing the fundamental signal transmission method.

Inventive Principle:
Principle #24Intermediary (Mediator)

Solution Approach 2:

The patent modifies the measurement parameters by introducing additional correction parameters (ionospheric delay correction and tropospheric delay correction) that are applied to the raw signal measurements. These parameter changes allow the system to account for atmospheric variations and improve location accuracy dynamically.

Inventive Principle:
Principle #35Parameter changes

2Measurement precision

If atmospheric delay correction is calculated using multiple reference signals, then location accuracy is improved, but calculation complexity increases

Engineering Contradiction:
Improvelocation accuracyVSAvoidcalculation complexity
Core Design Contradiction:
Measurement precisionVSDevice complexity

Solution Approach 1:

The patent segments the atmospheric delay correction into separate components: ionospheric delay correction and tropospheric delay correction. Each component can be calculated and applied independently, which simplifies the overall calculation process while maintaining accuracy. The segmentation allows for modular computation that reduces processing burden.

Inventive Principle:
Principle #1Segmentation

Solution Approach 2:

The patent applies partial correction by using available reference signals and atmospheric data to compute correction values, rather than requiring perfect or complete atmospheric modeling. This partial action approach provides sufficient accuracy for practical applications while avoiding the excessive complexity of idealized correction methods.

Inventive Principle:
Principle #16Partial or excessive action

Applied Scientific Principles

This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.

Function Achieved in This Case

This approach improves the accuracy of UE location determination by accounting for atmospheric delays, enhancing the performance of real-time kinematic (RTK) positioning with NTN nodes and enabling more precise wireless communication services.

Implementation Method 1

The set of RSs may travel from the set of NTN nodes to the apparatus through a first portion of an atmosphere and through a second portion of the atmosphere. The first portion of the atmosphere may be an ionosphere of the atmosphere.

Methodology Applied
Scientific EffectIonospheric delay: Refraction

Implementation Method 2

The second portion of the atmosphere may be a troposphere of the atmosphere.

Methodology Applied
Scientific EffectTropospheric delay: Refraction

Data Source

PatentUS20250164645A1Atmospheric delay correction for non-terrestrial network nodes
Publication Date: 2025.05.22 QUALCOMM INC
  • US20250164645A1 patent drawing
  • US20250164645A1 patent drawing
  • US20250164645A1 patent drawing

AI summary

A user equipment (UE) may receive a set of reference signals (RSs) from a set of non-terrestrial network (NTN) nodes. The set of RSs may travel from the set of NTN nodes to the UE through a first portion of an atmosphere and a second portion of the atmosphere. The UE may measure the set of RSs. The UE may calculate, based on the measured set of RSs, a first set of atmospheric delays associated with the first portion of the atmosphere and a second set of atmospheric delays associated with the second portion of the atmosphere. The UE may calculate a location of the UE based on the measured set of RSs, the first set of atmospheric delays, and the second set of atmospheric delays. The UE may transmit the calculated location of the UE. The first portion may include an ionosphere. The second portion may include a troposphere.