NTN UE Cell Reselection Using Threshold-Based Measurement Skipping
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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 determines whether to skip measurement operations based on thresholds for signal strength (Srxlev and Squal) and distance from the serving cell reference point, allowing it to optimize power consumption and reduce signaling.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the UE performs frequent GNSS-based position determination to enable accurate cell reselection and handover in NTN, then the measurement precision and cell reselection accuracy are improved, but the battery consumption increases and power efficiency deteriorates
Solution Approach 1:
The patent changes the parameter of position determination frequency from continuous/high-frequency to conditional/low-frequency based on whether the UE is in mobility mode. The network configures a mobility mode indicator that controls whether the UE performs GNSS-based position determination, thereby adapting the measurement frequency to actual mobility needs and reducing unnecessary battery consumption.
2Measurement precision
If the UE continuously performs measurement operations on neighboring cells to ensure optimal cell reselection, then the cell reselection accuracy is improved, but the power consumption increases
Solution Approach 1:
The patent implements dynamic measurement behavior where the UE adapts its measurement operations based on the configured mobility mode. In non-mobility mode, the UE skips measurement operations on neighboring cells in NTN, while in mobility mode, the UE performs measurements. This dynamic adjustment ensures optimal cell reselection accuracy only when actually needed, reducing power consumption during stationary periods.
3Reliability
If the UE performs frequent measurement operations to maintain accurate cell reselection in NTN, then the cell reselection reliability is improved, but the signaling overhead increases
Solution Approach 1:
The patent extracts and removes unnecessary measurement operations and associated signaling when the UE is in non-mobility mode. By checking the mobility mode indicator and skipping measurements when not in mobility mode, the system eliminates redundant signaling overhead while maintaining cell reselection reliability when actually needed through the mobility mode-based conditional execution.
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.