NTN Cell Reselection via Conditional Search and Distance Thresholds
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing wireless communication systems face challenges in performing seamless cell reselection in non-terrestrial networks (NTN) environments, particularly due to mobility between NTN and terrestrial networks (TN) and the need for efficient power management.
Innovation Solution
A method and apparatus for user equipment (UE) to perform cell reselection based on NTN in a wireless communication system, involving acquiring cell reselection condition information, moving between cells based on UE mobility, and performing an NTN cell search when specific conditions are met, while also configuring reference location and distance threshold information for TN cell searches.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the UE performs continuous cell search and measurement in NTN environment, then the cell reselection reliability is improved, but the power consumption increases
Solution Approach 1:
The network configures the UE with pre-defined cell reselection conditions including distance thresholds and reference location information before the UE needs to perform cell reselection. This allows the UE to determine in advance when cell search should be performed based on its location relative to configured thresholds, avoiding continuous searching and reducing power consumption while maintaining reliable cell reselection
Solution Approach 2:
The patent introduces dynamic parameters such as distance thresholds and reference location information that change based on UE mobility and network conditions. By adjusting these parameters, the system optimizes the balance between cell reselection reliability and power consumption, enabling the UE to perform measurements only when necessary rather than continuously
2Measurement precision
If the UE performs frequent cell measurements to handle mobility between NTN and TN, then the cell reselection accuracy is improved, but the processing complexity increases
Solution Approach 1:
The network provides pre-configured cell reselection condition information including distance thresholds and reference location data before the UE needs to make reselection decisions. This preliminary configuration simplifies the UE's processing by providing ready-to-use parameters, reducing the computational complexity of real-time cell measurement and reselection while maintaining high accuracy
Solution Approach 2:
The patent segments the cell reselection process into distinct phases: receiving pre-configured parameters, evaluating current location against thresholds, and performing measurements only when conditions are met. This segmentation reduces processing complexity by breaking down the complex mobility management task into manageable steps with clear decision points
3Loss of energy
If the UE performs conditional cell searches based on distance thresholds, then the power efficiency is improved, but the cell reselection response time increases
Solution Approach 1:
The network configures distance thresholds and reference location information in advance, allowing the UE to quickly determine whether cell search is needed by simple distance calculation rather than continuous monitoring. This preliminary setup enables rapid response when conditions change while maintaining power efficiency by avoiding unnecessary searches during stable conditions
Data Source
Figure 1
Figure 2
Figure 3
AI summary
Provided is a method of performing, by a user equipment (UE), cell reselection based on non-terrestrial networks (NTN) in a wireless communication system. Here, the method of performing cell reselection may include acquiring cell reselection condition information from a base station; moving from a first cell to a second cell based on mobility of the UE and acquiring measurement related information for cell reselection from the second cell; and performing an NTN cell search when a specific condition for cell reselection is satisfied based on the cell reselection condition information.