NTN Measurement Reporting via Satellite Parameters
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Solution Overview
Problem
Current Non-Terrestrial Network (NTN) systems face challenges in measurement reporting due to moving cells, long propagation delays, and large Doppler shifts, which affect handover processes and connectivity in satellite-based communication systems.
Innovation Solution
A method and system for enhanced measurement reporting in NTN systems, where a wireless device determines and performs measurements based on conditions such as timing advance, distance, elevation angle, and velocity, and a network node configures and receives measurement reports to improve handover efficiency and connectivity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If measurement reporting is performed in NTN systems, then handover processes can be executed, but measurement accuracy deteriorates due to moving cells, long propagation delays, and large Doppler shifts
Solution Approach 1:
The patent introduces NTN-specific parameters including timing advance values, distance to satellite, elevation angles, and velocity compensation parameters. These parameters are used to adjust measurement triggering conditions and reporting thresholds, allowing the system to account for the unique characteristics of satellite-based networks such as long propagation delays and Doppler shifts, thereby maintaining measurement accuracy despite the challenging environment
Solution Approach 2:
The network node acts as an intermediary by providing reference information about satellite position, velocity, and timing advance values to the wireless device. This intermediary information allows the device to compensate for Doppler shifts and propagation delays, improving measurement accuracy without requiring direct observation of the moving satellite
2Reliability
If measurement reporting is configured for NTN, then connectivity can be maintained, but network performance deteriorates due to service interruptions from moving cells
Solution Approach 1:
The system performs preliminary actions by configuring measurement reporting with NTN-specific parameters before handover is needed. The network provides advance information about satellite ephemeris, timing advance values, and expected Doppler shifts, allowing the wireless device to prepare measurement reports in advance. This preliminary configuration reduces service interruptions by ensuring measurements are already available when handover decisions are made
Solution Approach 2:
The patent implements dynamic adjustment of measurement reporting parameters based on satellite motion. The system continuously updates timing advance values, elevation angles, and velocity compensation parameters as the satellite moves, allowing the measurement reporting mechanism to adapt in real-time to the changing NTN environment, thereby maintaining both connectivity and network performance
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 enables more efficient handover processes and maintains connectivity by better accounting for NTN-specific conditions, reducing service interruptions and improving network performance in satellite-based communication systems.
Implementation Method 1
The satellites are moving with a very high velocity. This leads to a Doppler shift of the carrier frequency on the service link of up to 24 ppm for a LEO satellite at 600 km altitude.
Implementation Method 2
The inclination introduces a periodic movement of the satellite relative earth which introduces a predictable, and daily periodically repeating Doppler shift of the carrier frequency
Data Source
AI summary
A method by a wireless device includes determining whether one or more conditions for triggering measurements have occurred and performing the one or more measurements based on the occurrence of the one or more conditions. The one or more conditions for triggering measurements is based on at least one of: a timing advance value in a source cell; a distance between the wireless device and a satellite node serving a source cell or a candidate target cell; an expected time for the wireless device to be served in the source cell and/or in the candidate target cell; elevation angle of the satellite node serving the source cell and/or the candidate target cell; a point in time configured by a network node is reached; detection of an identifier associated with a specific cell; and a speed or velocity of the wireless device.