IoT NTN Mobility Measurements Under Doppler Shift Constraints

Resolve Bottlenecks,
Find Innovative SolutionsGenerate Solutions

Solution Overview

Problem

The challenges of Doppler shift and long propagation delays in IoT non-terrestrial networks (NTN) cause significant signal interference and measurement difficulties due to moving satellites and varying cell coverage, leading to inefficient power consumption and reduced battery life in IoT devices.

Innovation Solution

Adaptive measurement and mobility procedures are implemented in IoT NTN devices, allowing them to adjust cell changes and measurement procedures based on Doppler shift information, including deprioritizing, discarding, or skipping neighbor cell measurements, and adjusting measurement timing and frequency layer handling according to predefined or configured rules.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Measurement precision

If Doppler shift compensation and measurement procedures are performed in IoT NTN devices, then measurement accuracy is improved, but power consumption increases

Engineering Contradiction:

Improvemeasurement accuracyVSAvoidpower consumption

Core Design Contradiction:

Measurement precisionVSUse of energy by moving object

Solution Approach 1:

The patent implements adaptive measurement procedures where the device dynamically adjusts measurement parameters based on Doppler shift conditions. The measurement configuration is modified in real-time according to the severity of Doppler effects, allowing the system to maintain measurement accuracy when needed while reducing measurements when Doppler shift is minimal, thus optimizing power consumption.

Inventive Principle:

Principle #15Dynamics

Solution Approach 2:

The patent changes measurement parameters such as measurement frequency, bandwidth, and timing advance values based on Doppler shift information. By adjusting these parameters adaptively, the system achieves accurate measurements under high Doppler conditions while consuming less power when Doppler effects are manageable, directly resolving the contradiction between measurement precision and power usage.

Inventive Principle:

Principle #35Parameter changes

2Reliability

If neighbor cell measurements are performed frequently to maintain connectivity in moving satellite environments, then connection reliability is improved, but battery life is reduced

Engineering Contradiction:

Improveconnection reliabilityVSAvoidbattery life

Core Design Contradiction:

ReliabilityVSDuration of action of stationary object

Solution Approach 1:

The patent implements periodic measurement opportunities aligned with satellite orbital periods and Doppler shift patterns. Instead of continuous measurements, the device performs measurements at optimized intervals when Doppler conditions are favorable or when cell changes are likely, maintaining connection reliability while significantly reducing power consumption compared to continuous monitoring.

Inventive Principle:

Principle #19Periodic action

Solution Approach 2:

The patent applies partial measurement action by selectively measuring only certain neighbor cells or frequency layers based on Doppler shift predictions and current connection quality. This partial approach maintains sufficient reliability for IoT applications while reducing the total measurement load and power consumption.

Inventive Principle:

Principle #16Partial or excessive action

3Use of energy by moving object

If measurement procedures are reduced to save power in IoT devices, then battery life is extended, but measurement accuracy deteriorates due to Doppler shift

Engineering Contradiction:

Improvepower consumptionVSAvoidmeasurement accuracy

Core Design Contradiction:

Use of energy by moving objectVSMeasurement precision

Solution Approach 1:

The patent uses preliminary Doppler shift prediction based on satellite ephemeris data and device position to pre-identify when measurements will be necessary. By predicting future Doppler conditions and cell change likelihood, the system performs measurements in advance when power consumption can be optimized, ensuring measurement accuracy is maintained while reducing overall power usage compared to reactive measurement approaches.

Inventive Principle:

Principle #10Preliminary 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 enhances measurement accuracy and reduces power consumption by optimizing measurement procedures, thereby improving the efficiency and battery life of IoT devices in NTN environments.

Implementation Method 1

The challenges of Doppler shift and long propagation delays in IoT non-terrestrial networks (NTN) cause significant signal interference and measurement difficulties due to moving satellites

Methodology Applied

Scientific EffectDoppler shift: Doppler Effect

Data Source

PatentUS20260046714A1MEASUREMENT AND MOBILITY PROCEDURE DUE TO DOPPLER ISSUE IN IoT NTN

Publication Date: 2026.02.12 TELEFONAKTIEBOLAGET LM ERICSSON (PUBL)

AI summary

A method, network node and wireless device (WD) for measurement and mobility procedures due to doppler issues in an Internet of things (IoT) non-terrestrial network (NTN) are disclosed. According to one aspect, a method in a WD includes determining at least one neighbor cell and at least one frequency layer for which a measurement procedure is to be adapted due to Doppler shift. The method includes adapting the measurement procedure for the at least one neighbor cell and the at least one frequency layer, including at least one of deprioritizing, discarding, ignoring and skipping measurements on at least one of a neighbor cell of the determined at least one neighbor cell and a frequency layer of the determined at least one frequency layer.