NTN Cell Reselection Measurement Skipping for UE Power Saving
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Solution Overview
Problem
In non-terrestrial networks (NTN), existing wireless communication systems lack efficient mechanisms for UE to determine when to skip measurement operations on neighboring cells, leading to battery drain and increased signaling due to frequent GNSS-based position determination, which affects operations like cell reselection and handover.
Innovation Solution
A UE in an NTN is configured to skip measurement operations based on thresholds for signal strength (Srxlev and Squal) and distance from the serving cell reference point, reducing unnecessary measurements and conserving power.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the UE performs frequent measurement operations on neighboring cells using GNSS-based position determination, then cell reselection and handover accuracy is improved, but battery life deteriorates and signaling overhead increases
Solution Approach 1:
The patent changes the measurement triggering parameters from continuous GNSS-based position checks to threshold-based conditional measurements. The UE only performs measurements when Srxlev > threshold1 and Squal > threshold2 and distance < threshold3, transforming the measurement behavior from frequent/continuous to conditional/rare, thus saving battery while maintaining measurement accuracy when needed
Solution Approach 2:
The patent implements skipping of measurement operations by introducing a conditional check mechanism. When the three conditions (signal strength, signal quality, and distance) are satisfied, the UE skips the measurement operation entirely. This allows the system to rush through unnecessary measurements and only perform them when truly needed, reducing energy consumption and signaling overhead
2Measurement precision
If the UE performs frequent measurement operations on neighboring cells, then cell reselection and handover accuracy is improved, but signaling overhead increases
Solution Approach 1:
The patent changes the measurement triggering parameters from continuous GNSS-based position checks to threshold-based conditional measurements. The UE only performs measurements when Srxlev > threshold1 and Squal > threshold2 and distance < threshold3, transforming the measurement behavior from frequent/continuous to conditional/rare, thus reducing signaling overhead while maintaining measurement accuracy when needed
Solution Approach 2:
The patent implements skipping of measurement operations by introducing a conditional check mechanism. When the three conditions (signal strength, signal quality, and distance) are satisfied, the UE skips the measurement operation entirely. This reduces the number of measurement reports and associated signaling messages, lowering signaling overhead
Data Source
AI summary
Methods and apparatuses for measurement and cell reselection in NTN. A method of operating a UE comprises: determining, based on a first threshold and a second threshold, whether a first condition is satisfied; determining, based on a third threshold, whether a second condition is satisfied; and skipping measurement operations on neighboring cells in a NTN based on a determination that the first condition and the second condition are satisfied, wherein: the first condition corresponds to a cell selection receive (RX) level value (Srxlev) being greater than the first threshold and a cell selection quality value (Squal) being greater than the second threshold, respectively, and the second condition corresponds to a distance between a UE location and a serving cell reference point being less than the third threshold.