Satellite Prioritization for NTN Cell Reselection
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Solution Overview
Problem
In Non-Terrestrial Networks (NTN), IoT and eMTC devices face challenges in efficiently performing neighbor cell measurements due to high frequency Doppler shifts caused by low-earth orbit satellites, leading to increased power consumption and battery drain.
Innovation Solution
The proposed solution involves determining candidate satellites for neighbor cell measurements based on availability and priority, allowing the device to prioritize satellites and limit the number of measurements, thereby reducing power consumption.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the device performs neighbor cell measurements on multiple satellites, then the measurement accuracy and reliability are improved, but the power consumption increases
Solution Approach 1:
The patent applies partial action by limiting the device to measure only a subset of candidate satellites rather than all available satellites. The network provides a prioritized list of candidate satellites, and the device is instructed to measure only the top-ranked candidates (e.g., top 1-3 satellites) that are currently visible and have highest priority, thereby reducing measurement workload and power consumption while maintaining sufficient measurement reliability for cell reselection decisions.
2Measurement precision
If the device measures more candidate satellites, then the cell reselection accuracy is improved, but the measurement time increases
Solution Approach 1:
The patent applies preliminary action by having the network pre-calculate and provide a prioritized list of candidate satellites based on predicted availability, priority levels, and current orbital positions. This pre-sorting eliminates the need for the device to evaluate all possible satellites in detail, allowing the device to quickly measure only the top-ranked candidates and make cell reselection decisions without time-consuming exhaustive measurements.
3Reliability
If the device continuously monitors all available satellites, then the network reliability is improved, but the battery life decreases
Solution Approach 1:
The patent applies partial action by instructing the device to monitor only a partial set of high-priority candidate satellites rather than continuously monitoring all available satellites. The network provides prioritization information that enables the device to focus measurement resources on the most relevant satellites for maintaining network reliability, thereby extending battery life by reducing overall monitoring activity while still ensuring sufficient reliability for critical cell reselection functions.
Data Source
AI summary
Example embodiments of the present disclosure generally relate to methods, devices, apparatuses and computer readable storage medium for cell reselection requirements with satellite prioritization. The method includes determining at least one first candidate satellite currently available for a neighbor cell measurement; determining at least one target satellite to be measured in the neighbor cell measurement at least based on the number of the at least one first candidate satellite and respective priorities of the at least one first candidate satellite, or at least one second candidate satellite that is becoming available within a first time interval; and performing the neighbor cell measurement on the at least one target satellite.