Satellite Cell Measurement Priority in Shared SMTC Windows
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Solution Overview
Problem
In Non-Terrestrial Networks (NTN), the existing methods for adjusting SMTC offsets to accommodate varying propagation delays across multiple satellite cells associated with the same SMTC are inefficient, leading to challenges in timely and effective cell measurement.
Innovation Solution
A method for cell measurement in NTN systems where a terminal prioritizes and adjusts SMTC offsets based on measurement priorities of satellite cells, such as descending or ascending orders of PCIs, SMTC offsets, or network-configured priorities, to efficiently measure multiple satellite cells within shared SMTC windows.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the terminal measures all satellite cells associated with the same SMTC equally, then measurement completeness is improved, but measurement time and processing complexity increase
Solution Approach 1:
The patent segments the measurement process by dividing satellite cells into different priority groups (first priority, second priority, etc.). The terminal performs measurements in a segmented manner according to priority levels rather than treating all cells equally, which reduces overall measurement time while ensuring high-priority cells are measured first
Solution Approach 2:
The patent applies preliminary action by determining measurement priorities before actual measurement begins. The network configures priority information for different satellite cells in advance, allowing the terminal to pre-plan its measurement sequence and focus resources on high-priority cells first, thereby reducing total measurement time
2Measurement precision
If the terminal adjusts SMTC offsets for each satellite cell individually, then measurement accuracy is improved, but system complexity increases
Solution Approach 1:
The patent applies local quality by allowing different SMTC offset adjustments for different priority groups of satellite cells. High-priority cells can have one offset configuration while lower-priority cells have another, enabling tailored optimization for each group without requiring individual customization for every single cell, thus balancing accuracy with complexity
Solution Approach 2:
The patent changes the SMTC offset parameter based on priority levels. The network configures different offset values for different priority groups, and the terminal adjusts its measurement timing accordingly. This parameter change approach allows accurate measurement of high-priority cells while simplifying the process for lower-priority cells
3Productivity
If the terminal prioritizes measurement of high-priority satellite cells, then measurement efficiency is improved, but measurement completeness may be compromised
Solution Approach 1:
The patent implements periodic action by configuring multiple SMTC windows with different periodicities for different priority groups. High-priority cells are measured in more frequent or dedicated measurement windows, while lower-priority cells are measured in subsequent windows. This periodic structure ensures efficiency for high-priority cells while maintaining eventual completeness for all cells
Solution Approach 2:
The patent applies dynamics by making the measurement process adaptive to priority requirements. The terminal dynamically adjusts which cells to measure in each SMTC window based on the configured priorities, allowing flexible resource allocation that maintains efficiency while ensuring all cells are eventually measured across different time periods
Data Source
AI summary
Provided is a method for cell measurement, performed by a terminal. The method includes: performing a cell measurement for at least two satellite cells associated with a same synchronization signal/physical broadcast channel (PBCH) block (SSB) measurement time configuration (SMTC) based on measurement priorities of the at least two satellite cells.