UE Cell Search Period Adjustment in NTN Environments
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Solution Overview
Problem
Non-terrestrial network (NTN) communication systems face inefficiencies due to large cell radii, leading to higher path loss and lower service quality compared to terrestrial networks, necessitating specialized search and cell reselection settings to improve user equipment (UE) mobility and communication efficiency.
Innovation Solution
The UE in NTN systems adjusts its discovery period and cell reselection based on distance from terrestrial cells, signal power, and service time of NTN cells to prioritize terrestrial network (TN) cell connections, reducing battery consumption and enhancing communication quality.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If existing terrestrial network technology is applied to NTN communication, then system simplicity is maintained, but service quality and throughput deteriorate due to large path loss
Solution Approach 1:
The patent applies parameter changes by adjusting the measurement period T based on multiple factors including distance from TN cell, signal power from TN cell, and service time of NTN cell. This dynamic parameter adjustment allows the system to adapt to varying NTN communication conditions, improving service quality without fundamentally changing the terrestrial network technology structure.
2Productivity
If measurement period is shortened to improve cell search effectiveness, then mobility support is enhanced, but battery consumption increases
Solution Approach 1:
The patent implements dynamics by making the measurement period T a dynamic parameter that adjusts based on current communication conditions. The measurement period is determined based on distance from TN cell, signal power, and service time, allowing the system to optimize between cell search effectiveness and battery consumption in real-time rather than using a fixed measurement period.
Solution Approach 2:
The measurement period parameter is changed dynamically based on multiple conditions including service time of NTN cell and signal characteristics. This parameter adaptation allows the UE to extend measurement periods when conditions permit, reducing battery consumption while maintaining effective cell search capability when needed.
3Ease of operation
If UE prioritizes NTN cell connection to maintain service continuity, then mobility support is improved, but communication quality deteriorates due to large path loss
Solution Approach 1:
The patent applies feedback by continuously monitoring multiple parameters including distance from TN cell, signal power from TN cell, and service time of NTN cell. Based on this feedback, the UE dynamically adjusts the measurement period and cell reselection behavior, enabling intelligent decision-making that balances mobility support with communication quality maintenance.
Data Source
AI summary
A disclosure of this specification provides a method for radio communication, performed by a user equipment (UE). The method is comprising: transmitting a random access preamble to an NTN (Non-Terrestrial Network) cell; receiving a random access response from the NTN cell; searching for a TN (Terrestrial Network) cell with a period T, wherein the T is determined based on i) distance between location of the UE and reference location of the TN, ii) signal power from the TN cell and iii) service time of the NTN cell.