CGI Reading Procedure Period Extension for NR-U LBT Failures
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Solution Overview
Problem
Current 3GPP networks face challenges in performing Cell Global Identifier (CGI) reading procedures in unlicensed spectrum due to Listen Before Talk (LBT) failures, which cause inconsistencies and failures in identifying and reporting cell information, especially in New Radio (NR) Unlicensed (NR-U) cells, as existing requirements do not account for UE behavior during LBT failures.
Innovation Solution
The proposed solution involves defining a procedure period for CGI reading that accounts for LBT failures by extending the time based on the number of unavailable transmission occasions, allowing the UE to restart or drop the CGI reading process, and adjusting counters to manage LBT failures, ensuring reliable CGI acquisition and reporting.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the UE performs CGI reading procedure in NR-U cells, then cell identification capability is improved, but procedure failures occur due to LBT failures
Solution Approach 1:
The patent makes the CGI reading procedure dynamic by introducing a restart mechanism. When LBT failures occur, the UE can restart the CGI reading procedure after a configured number of failures, rather than giving up permanently. This dynamic adjustment allows the system to adapt to varying channel conditions and maintain reliability while improving eventual success rates.
Solution Approach 2:
The patent implements prior cushioning by pre-configuring maximum failure thresholds and restart parameters before the CGI reading procedure begins. The network configures the UE with maximumCGI-ReadingFailures and other parameters in advance, so when LBT failures occur, the UE has pre-established rules to follow, cushioning against the uncertainty of LBT outcomes and maintaining procedural reliability.
2Adaptability or versatility
If the network requests CGI information for multiple cells, then connection management capability is improved, but procedure complexity increases due to LBT failures
Solution Approach 1:
The patent segments the CGI reading procedure into independent, manageable units that can be individually restarted. Each cell's CGI reading is treated as a separate entity with its own failure counter and restart capability. This segmentation allows the UE to handle multiple cells independently, managing complexity through modular processing while maintaining adaptability across multiple cells.
Solution Approach 2:
The patent applies preliminary action by pre-configuring all necessary parameters (maximumCGI-ReadingFailures, cgI-ReadingPeriod, etc.) before the actual CGI reading begins. The network provides these configurations in advance through RRC signaling, so the UE has a complete action plan ready before encountering LBT failures, reducing procedural complexity during execution while maintaining multi-cell adaptability.
3Measurement precision
If the UE extends the procedure period to account for LBT failures, then timing accuracy is improved, but procedure duration increases
Solution Approach 1:
The patent changes the timing parameters dynamically based on LBT failure conditions. The procedure period is extended only when necessary (after LBT failures), rather than being permanently extended. The UE adjusts the timing by adding extended periods proportional to the number of failures, maintaining timing accuracy for successful readings while minimizing time loss through conditional parameter adjustment rather than universal extension.
Data Source
AI summary
The present application relates to devices and components including apparatus, systems, and methods to determine a procedure period for a cell global identifier (CGI) reading procedure.