NR-U Cell Detection with Adaptive Monitoring After LBT Failures
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Solution Overview
Problem
Listen before talk failures in wireless communication systems using unlicensed spectrum can interrupt cell detection and measurement, leading to inefficiencies in UE operations.
Innovation Solution
User equipment (UE) devices detect a threshold condition of missed reference signal opportunities and adjust monitoring and measurement strategies, alerting the network to modify reference signal monitoring and measurement.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If UE performs cell detection and measurement in unlicensed spectrum, then communication capability is improved, but listen before talk failures interrupt the process causing loss of time
Solution Approach 1:
The network pre-configures the UE with alternative reference signal opportunities and monitoring parameters before LBT failures occur. This allows the UE to quickly switch to alternative opportunities without waiting for failure detection, reducing time loss from LBT interruptions in unlicensed spectrum
Solution Approach 2:
The system dynamically adjusts reference signal monitoring parameters based on LBT failure conditions. The network can modify monitoring occasions, periodicity, and resource allocation in response to detected LBT failures, allowing the cell detection and measurement process to adapt to changing unlicensed spectrum availability
2Measurement precision
If UE monitors reference signals continuously for cell detection, then detection accuracy is improved, but energy consumption increases
Solution Approach 1:
The network configures periodic reference signal monitoring occasions instead of continuous monitoring. The UE only monitors reference signals at predetermined intervals and occasions, maintaining adequate cell detection accuracy while significantly reducing energy consumption by keeping the receiver off between monitoring occasions
Solution Approach 2:
The system uses a threshold-based approach where the UE monitors reference signals with reduced intensity or frequency under normal conditions, and only increases monitoring activity when threshold conditions indicate potential LBT failures or cell quality degradation, optimizing the balance between detection accuracy and energy usage
Data Source
AI summary
Embodiments are presented herein of apparatuses, systems, and methods for a user equipment device (UE) and/or cellular network to perform to perform cell detection and measurement, e.g., in new radio (NR) unlicensed (NR-U). The UE may determine that a threshold condition related to missed reference signal opportunities is reached. In response, the UE may modify reference signal monitoring and/or measurement.