Uplink Timing Advance Across NTN Configuration Changes
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Solution Overview
Problem
Existing wireless communication systems face challenges in efficiently managing time-based reconfiguration, particularly in non-terrestrial networks (NTN), where satellite coverage changes can cause disruptions due to unsynchronized cell handovers and configuration changes.
Innovation Solution
The method involves determining timing advance (TTA) based on first and second NTN configurations, using a constant offset before and after a stop time, to facilitate synchronized uplink transmission and minimize disruptions during cell handovers.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If time-based reconfiguration is performed in NTN environments, then network stability and synchronization are improved, but service interruptions and disruptions occur during cell handovers
Solution Approach 1:
The base station transmits the stop time indication in advance before the actual reconfiguration event occurs. This allows the terminal to prepare for the upcoming configuration change by storing current configuration data and timing advance values, ensuring seamless transition without service interruption when the stop time is reached
Solution Approach 2:
The terminal stores configuration data and timing advance values in advance before the stop time occurs. This buffering of configuration information ensures that when the reconfiguration event happens, the terminal can immediately apply the pre-stored values without experiencing service disruption or timing misalignment
2Adaptability or versatility
If NTN configuration changes are made to adapt to satellite coverage changes, then adaptability is improved, but synchronization between UE and base station deteriorates
Solution Approach 1:
The base station provides feedback to the terminal by transmitting stop time indications and configuration changes through system information blocks. This feedback mechanism ensures that the terminal receives authoritative timing and configuration updates, maintaining synchronization while adapting to NTN environmental changes
Solution Approach 2:
The base station preliminarily indicates the stop time and configuration changes before they take effect. This advance notification allows the terminal to prepare for configuration transitions while maintaining synchronization with the base station, preventing desynchronization during handover events
3Reliability
If timing advance is determined using constant offset before stop time, then uplink transmission synchronization is improved, but configuration complexity increases
Solution Approach 1:
The system applies different timing advance determination methods for different time periods: before the stop time, a constant offset is used for simplicity, while after the stop time, updated NTN configuration parameters are applied. This localized approach optimizes both synchronization accuracy and configuration management complexity at different stages
Data Source
AI summary
Aspects of the present disclosure are to address the problems of performing time-based reconfiguration in mobile network. The method of the terminal includes receiving a first system information, receiving a second system information, determining a total amount of timing advance (TTA) based on the first NTN configuration or based on second NTN configuration and performing uplink transmission based on the TTA. The TTA is determined based on, before the stop time, the first NTN configuration and the constant offset. The TTA is determined based on, after the stop time, the second NTN configuration and the constant offset.