Dynamic SIB19 Re-acquisition for NTN Uplink Synchronization
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Solution Overview
Problem
Current methods for re-acquiring System Information Block 19 (SIB19) in Non-Terrestrial Networks (NTN) lack a standardized mechanism for periodicity and timing, leading to potential UL synchronization loss and service discontinuity due to static re-acquisition methods that do not consider the User Equipment's (UE) current status or network resources effectively.
Innovation Solution
A dynamic algorithm that adjusts the timing and periodicity of SIB19 re-acquisition based on the UE's Radio Resource Control (RRC) state, emergency call status, and UL Sync validity timer duration, ensuring optimal re-acquisition before T430 timer expiry and minimizing resource wastage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If static re-acquisition methods are used for SIB19, then implementation simplicity is maintained, but UL synchronization reliability deteriorates due to potential synchronization loss and service discontinuity
Solution Approach 1:
The patent implements dynamic re-acquisition methods that adapt to different UE states (RRC_IDLE, RRC_CONNECTED, emergency calls) and network conditions. The re-acquisition periodicity and timing are adjusted based on current operational context, transforming the static approach into a dynamic one that maintains reliability while managing complexity through structured state-based decision logic
Solution Approach 2:
The patent changes key parameters such as re-acquisition periodicity, timing offsets, and validity duration based on UE state and network conditions. By dynamically adjusting these parameters rather than using fixed values, the system achieves higher reliability in maintaining UL synchronization while the structured parameter management prevents excessive complexity
2Reliability
If frequent re-acquisition of SIB19 is performed, then UL synchronization reliability is improved, but network resource consumption increases
Solution Approach 1:
The patent implements periodic re-acquisition of SIB19 with dynamically adjusted periodicity based on UE state and network conditions. This periodic approach ensures synchronization is maintained at appropriate intervals without continuous monitoring, balancing reliability requirements with resource conservation by acquiring information only when necessary
Solution Approach 2:
The patent applies partial action by performing re-acquisition only to the extent necessary for maintaining synchronization, rather than continuous full re-acquisition. The validity duration and periodicity are optimized to achieve sufficient synchronization maintenance with minimal resource consumption, avoiding excessive re-acquisition operations
3Adaptability or versatility
If static re-acquisition timing is used, then implementation complexity is reduced, but service continuity deteriorates due to inability to adapt to varying UE states
Solution Approach 1:
The patent segments the re-acquisition control logic into distinct state-based procedures for different UE conditions (RRC_IDLE, RRC_CONNECTED, emergency calls, normal calls). This segmentation allows the system to adapt to varying UE states while managing complexity through modular, state-specific control logic rather than a single complex decision framework
Data Source
AI summary
Embodiments disclosed herein relate to dynamic methods and systems for reading System Information Block 19 (SIB19) for maintaining Uplink Synchronization (UL Sync) and updated cell information during Non-Terrestrial networks (NTN) connectivity. The methods include a dynamic algorithm to reacquire SIB19 by considering different factors of UE's current status such as Radio Resource Control (RRC) states (idle/inactive/connected), SI periodicity of SIB19, emergency call status and UL Sync validity timer duration. The methods include monitoring of the UE status periodically and dynamically executing the algorithm to decide the time instance and periodicity to re-acquire SIB-19 based on UE current status. The methods include evaluating the UE condition on each SIB periodicity, and determining the next time period and periodicity to read SIB19.