Terminal Network Selection for TN-NTN Cell Search Control
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Solution Overview
Problem
User Equipment (UE) continues searching for Terrestrial Network (TN) cells outside coverage areas and unnecessarily connects to Non-Terrestrial Network (NTN) cells within coverage areas, leading to decreased communication speed and increased power consumption.
Innovation Solution
A terminal with a control unit that selects a network based on cell quality and transmits assistance information to prioritize connections, and a reception unit that stops frequency measurements of lower-quality cells.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the UE continues searching for TN cells outside coverage areas, then the UE maintains connectivity options, but communication speed decreases and power consumption increases
Solution Approach 1:
The network performs preliminary actions by transmitting cell quality information and assistance information to the UE in advance. This allows the UE to proactively stop searching for TN cells when quality indicators show that TN cell quality is below a threshold while NTN cell quality is above a threshold, preventing unnecessary communication attempts before they occur and maintaining optimal communication speed.
2Reliability
If the UE continues searching for TN cells outside coverage areas, then the UE maintains connectivity options, but terminal power consumption increases
Solution Approach 1:
The network provides feedback to the UE by transmitting cell quality information and assistance information indicating when to stop searching for TN cells. The UE uses this feedback to adjust its searching behavior, stopping TN cell searches when quality indicators show that TN cell quality is below a threshold while NTN cell quality is above a threshold, thereby reducing power consumption while maintaining connectivity through NTN.
3Reliability
If the UE connects to NTN cells within coverage areas, then the UE ensures continuous communication, but communication speed decreases compared to TN cell connection
Solution Approach 1:
The system dynamically adjusts the UE's network selection and searching behavior based on real-time cell quality conditions. When TN cell quality is below threshold and NTN cell quality is above threshold, the UE stops searching for TN cells and connects to NTN cells, ensuring communication continuity. When TN cell quality improves above the threshold, the UE resumes TN cell searching to potentially achieve higher communication speeds, making the system adaptable to changing conditions.
Data Source
AI summary
A terminal includes: a control unit that selects a first network forming a first cell, or a second network located at an altitude higher than the first network and forming a second cell as a network to which a terminal connects; and a transmission unit that transmits assistance information including information on the selected first network or the selected second network to a network.