NTN System Information Reuse for IoT Power Reduction

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Solution Overview

Problem

In Non-Terrestrial Networks (NTNs), especially those involving Low Earth Orbit (LEO) and Medium Earth Orbit (MEO) satellites, frequent cell reselection due to moving satellites leads to high power consumption and reduced battery life in IoT devices, as they need to frequently acquire System Information (SI) upon waking up, which is inefficient and energy-intensive.

Innovation Solution

Implement a method where a User Equipment (UE) receives a set of system information parameters from one cell and uses an indication from another cell to reuse these parameters for cell reselection, thereby reducing the need for frequent SI acquisition and minimizing power consumption by distinguishing essential from non-essential SI and broadcasting this information through the Master Information Block (MIB) or System Information Block (SIB).

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If frequent cell reselection is performed in NTN due to moving satellites, then connectivity is maintained, but power consumption increases and battery life decreases

Engineering Contradiction:

ImproveconnectivityVSAvoidpower consumption

Core Design Contradiction:

ReliabilityVSUse of energy by moving object

Solution Approach 1:

The patent segments system information into essential and non-essential parts. Essential SI is acquired during cell reselection to maintain connectivity, while non-essential SI is avoided to reduce power consumption. This segmentation allows the UE to perform cell reselection reliably without expending excessive energy on acquiring all system information.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The patent extracts and identifies essential system information parameters that are necessary for cell reselection and connectivity maintenance. By taking out only the essential SI from the complete set of system information, the UE can perform cell reselection in NTN without acquiring redundant non-essential information, thereby reducing power consumption while maintaining connectivity.

Inventive Principle:

Principle #2Taking out (Extraction)

2Loss of information

If complete system information acquisition is performed during cell reselection, then all necessary information is obtained, but time and energy are wasted on non-essential information

Engineering Contradiction:

Improveinformation completenessVSAvoidacquisition time

Core Design Contradiction:

Loss of informationVSLoss of time

Solution Approach 1:

The patent applies partial action by acquiring only the essential portion of system information during cell reselection in NTN, rather than acquiring the complete set. This partial acquisition is sufficient to maintain connectivity and perform necessary cell reselection operations, eliminating the time and energy waste associated with acquiring non-essential information.

Inventive Principle:

Principle #16Partial or excessive action

3Reliability

If all system information is acquired during cell reselection, then system reliability is ensured, but device complexity and processing overhead increase

Engineering Contradiction:

Improvesystem reliabilityVSAvoidprocessing overhead

Core Design Contradiction:

ReliabilityVSDevice complexity

Solution Approach 1:

The patent segments system information into essential and non-essential categories. During cell reselection, only essential SI is acquired and processed, reducing the processing overhead and device complexity while maintaining system reliability. The segmentation allows the UE to focus computational resources on critical information only.

Inventive Principle:

Principle #1Segmentation

Data Source

PatentUS20250097811A1Systems and methods for reducing system information acquisition during cell reselection in a non-terrestrial network

Publication Date: 2025.03.20 TELEFONAKTIEBOLAGET LM ERICSSON (PUBL)

AI summary

A method (700) performed by a UE (112) includes receiving (702), from a first cell of a NTN, a set of one or more system information parameters. The UE receives, from a second cell of the NTN, an indication to use, for the second cell, the set of one or more system information parameters received from the first cell.