Satellite Slope-Based Cell Reselection for Battery-Efficient NTN Terminals
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Solution Overview
Problem
Wireless communication devices using non-terrestrial networks experience excessive neighbor cell measurement requests and frequent cell reselections, leading to reduced battery life due to changing satellite coverage and received power levels, which existing solutions like relaxed monitoring do not adequately address.
Innovation Solution
Wireless terminals calculate satellite elevation angle slope and received power level slope to determine the optimal time for cell reselection evaluations, using parameters like Sangle Slope Interval, Sangle Threshold, and Srxlevel thresholds to minimize unnecessary measurements and reselections.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If wireless terminals continuously monitor neighbor cell signals and perform cell reselection evaluations in non-terrestrial networks, then communication reliability is maintained, but power consumption increases significantly
Solution Approach 1:
The patent applies parameter changes by dynamically adjusting the cell reselection evaluation triggering conditions based on satellite movement characteristics. Instead of continuous monitoring, the system changes the evaluation trigger to specific events (satellite handover moments), thereby reducing power consumption while maintaining communication reliability during satellite transitions.
Solution Approach 2:
The patent implements periodic action by scheduling cell reselection evaluations at specific intervals related to satellite orbital periods and handover events. Rather than continuous evaluation, the system performs measurements periodically when satellites approach critical handover positions, reducing overall power consumption while ensuring reliable handover execution.
2Adaptability or versatility
If wireless terminals perform frequent cell reselection evaluations to adapt to changing satellite coverage, then network adaptability improves, but battery life decreases
Solution Approach 1:
The patent applies preliminary action by predicting satellite handover events based on orbital parameters and terminal position data. The system performs cell reselection evaluations in advance of actual handover moments, allowing the terminal to adapt to changing satellite coverage proactively while minimizing unnecessary measurements that would drain battery life.
Solution Approach 2:
The patent implements feedback mechanisms by monitoring satellite signal strength trends and terminal movement patterns to dynamically adjust reselection evaluation timing. The system uses feedback from signal quality measurements to determine when evaluations are truly necessary, improving network adaptability while conserving battery life by avoiding redundant measurements.
3Measurement precision
If wireless terminals execute cell reselection evaluation processes based on traditional thresholds, then measurement accuracy is maintained, but the number of unnecessary measurements increases
Solution Approach 1:
The patent applies dynamics by making the cell reselection evaluation triggering conditions adaptive rather than static. The system dynamically adjusts measurement triggering based on satellite orbital parameters, signal strength trends, and terminal velocity, maintaining measurement accuracy when needed while improving measurement efficiency by suppressing unnecessary evaluations during stable connection periods.
Data Source
AI summary
A wireless terminal is described. The wireless terminal includes receiving circuitry configured to calculate a distance to a satellite slope to determine triggering of a cell reselection process.