NTN Wireless Connection Maintenance with SIB 19 Cell Reselection
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Solution Overview
Problem
In a communication system utilizing Non-Terrestrial Networks (NTN), terminal devices may fail to establish a wireless connection due to the inability to obtain System Information Block (SIB) 19, leading to connection interruptions.
Innovation Solution
A wireless connection maintenance method for terminal devices, involving determining that a target cell is forbidden and/or performing cell reselection when the device is in a specific state and has not obtained essential system information, such as SIB 19, to ensure continuous connectivity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the terminal device waits to obtain SIB 19 before establishing connection, then connection establishment accuracy is improved, but connection establishment time increases and connection stability deteriorates
Solution Approach 1:
The terminal device performs cell reselection proactively when detecting that it is in a forbidden cell or when system information acquisition fails, rather than waiting passively. This preliminary action prevents connection interruptions before they occur, resolving the contradiction between waiting for complete information (accuracy) and maintaining continuous connectivity (stability).
Solution Approach 2:
The terminal device autonomously determines its own state (whether it has obtained SIB 19, whether it's in a forbidden cell) and self-initiates cell reselection without requiring network intervention. This self-service mechanism ensures connection stability while maintaining accurate decision-making based on local information assessment.
2Reliability
If the terminal device performs cell reselection frequently to maintain connectivity, then connection stability is improved, but system information acquisition opportunities are lost and connection accuracy deteriorates
Solution Approach 1:
The terminal device applies different strategies based on local conditions: when SIB 19 is obtained, normal operation continues; when SIB 19 is not obtained or the cell is forbidden, cell reselection is triggered. This localized decision-making ensures connection stability while preserving system information acquisition opportunities by acting only when necessary.
Solution Approach 2:
The terminal device changes its operational parameter (cell selection behavior) based on the acquisition status of system information. When SIB 19 is unavailable, the device transitions from normal cell operation to active cell reselection mode, maintaining connection stability while creating new opportunities for information acquisition in subsequent cells.
3Reliability
If the terminal device determines cells as forbidden based on missing SIB 19, then connection interruption is reduced, but false positives increase and device complexity increases
Solution Approach 1:
The patent extracts the specific system information element (SIB 19) that is critical for connection establishment and uses its acquisition status as the sole criterion for determining forbidden cells. This extraction approach simplifies the determination process by focusing on one key parameter rather than analyzing multiple cell parameters, reducing device complexity while maintaining connection continuity.
Data Source
AI summary
A wireless connection maintenance method includes: determining that a target cell is forbidden and/or performing a cell reselection in response to the terminal device being in a first specific state and the terminal device having not obtained first system information.