NTN Neighboring-Cell Measurement with Position Thresholds
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Solution Overview
Problem
Non-terrestrial network (NTN) systems face challenges in neighboring cell measurement due to the mobility of NTN cells, particularly in quasi-Earth moving cells, which affect the accuracy of cell measurement and reselection by terminal devices.
Innovation Solution
Implementing a method where terminal devices perform neighboring cell measurement based on parameters such as distance, height, azimuth angle, or sub-zones within the NTN cell, and network devices provide corresponding parameters to aid in accurate measurement.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If neighboring cell measurement is performed in a moving NTN cell, then the terminal device can maintain connectivity, but the measurement accuracy deteriorates due to coverage region changes
Solution Approach 1:
The network device performs preliminary actions by calculating and providing reference position information and distance thresholds to the terminal device before the terminal device performs neighboring cell measurements. This allows the terminal device to proactively identify when it approaches cell boundaries and triggers measurements at appropriate times, maintaining connectivity while improving measurement accuracy despite cell movement.
Solution Approach 2:
The system implements feedback by having the network device continuously track the terminal device's position relative to the moving cell coverage region and provide updated reference position information and distance thresholds. This feedback loop enables the terminal device to adjust its measurement timing dynamically, ensuring accurate measurements are performed at critical moments when the terminal device approaches cell boundaries.
2Measurement precision
If the network device provides detailed position information to the terminal device, then measurement accuracy improves, but the signaling overhead increases
Solution Approach 1:
The network device extracts and provides only the essential information needed for accurate measurement - specifically reference position information and distance thresholds - rather than transmitting complete position data. This selective extraction maintains measurement accuracy while significantly reducing signaling overhead by transmitting only the critical parameters the terminal device needs to make measurement decisions.
3Reliability
If the terminal device performs frequent measurements to ensure accuracy, then measurement reliability improves, but energy consumption increases
Solution Approach 1:
The network device performs preliminary calculations to determine and provide reference position information and distance thresholds to the terminal device. This allows the terminal device to avoid frequent measurements by only performing them when the distance to the reference position approaches the threshold, thereby maintaining measurement reliability while significantly reducing energy consumption from unnecessary measurements.
Solution Approach 2:
Instead of continuous or frequent measurements, the system implements periodic measurements triggered by distance thresholds. The terminal device measures neighboring cells periodically based on its distance from the reference position, performing measurements only when necessary (when approaching cell boundaries) rather than continuously, thus maintaining reliability while reducing energy consumption.
Data Source
AI summary
A method and an apparatus for wireless communication are provided. An example method includes: performing, by a terminal device, neighboring cell measurement in a non-terrestrial network (NTN) cell based on a first parameter, wherein the first parameter is associated with one or more of following information: a distance between the terminal device and a network device in the NTN cell; a height of a network device in the NTN cell from ground; an azimuth angle of an antenna of a network device in the NTN cell; a sub-zone in the NTN cell, or a distance between an edge of the NTN cell and the network device.