LBT Failure Detection Counter Mechanism for NR-U
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Solution Overview
Problem
In New Radio (NR-U) systems on unlicensed frequency bands, continuous LBT failure detection and recovery mechanisms lead to unnecessary consistent LBT failures, increasing power consumption and air interface overhead, and can result in misinterpretation of channel busy conditions, causing inefficient NR-U channel utilization.
Innovation Solution
A mechanism is introduced where consistent LBT failure is triggered only when a counter reaches a specific value or exceeds it without active BWP failures, and the counter is reset under certain conditions, along with indicating LBT failure information and stopping recovery procedures to avoid unnecessary BWP switching and reconfiguration.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If continuous LBT failure detection and recovery mechanisms are implemented, then LBT failure detection capability is improved, but power consumption increases and air interface overhead increases
Solution Approach 1:
The patent applies partial action by implementing LBT failure detection only when specific conditions are met (counter reaches threshold value, or counter exceeds threshold without active BWP failures), rather than continuously detecting. This selective detection approach maintains reliability while reducing power consumption compared to continuous monitoring.
Solution Approach 2:
The patent implements periodic action through the counter mechanism that increments with each LBT failure indication and resets under certain conditions. This creates a periodic detection pattern where failure triggering occurs only at specific intervals (when counter reaches threshold), reducing continuous power consumption while maintaining detection capability.
2Reliability
If continuous LBT failure detection and recovery mechanisms are implemented, then LBT failure detection capability is improved, but air interface overhead increases
Solution Approach 1:
The patent reduces air interface overhead by applying partial action - triggering LBT failure reporting only when specific conditions are met (counter reaches threshold or exceeds threshold without active BWP failures), rather than reporting every LBT failure. This selective reporting maintains detection capability while reducing overhead.
Solution Approach 2:
The counter-based mechanism creates periodic action where failure triggering and reporting occur only at specific intervals (when counter reaches threshold value), reducing the frequency of air interface transmissions compared to continuous reporting, thus reducing overhead.
3Reliability
If continuous LBT failure detection and recovery mechanisms are implemented, then LBT failure detection capability is improved, but channel utilization efficiency deteriorates
Solution Approach 1:
The patent improves channel utilization by applying partial action - implementing LBT failure triggering only under specific conditions (counter threshold met, or threshold exceeded without active BWP failures) rather than continuously. This reduces unnecessary BWP switching and reconfiguration, allowing more efficient channel usage while maintaining detection capability.
Data Source
AI summary
A method and apparatus for consistent LBT failure detection and recovery. The method is applicable to a terminal equipment, and the method includes when a higher layer receives an LBT failure indication from lower layer(s) and a counter for consistent LBT failure detection is equal to a first value, or, when a higher layer receives an LBT failure indication from lower layer(s) and a counter for consistent LBT failure detection is greater than or equal to a first value and there exists no triggered consistent LBT failures in an active BWP in a serving cell of a terminal equipment, triggering the consistent LBT failures of the active BWP in the serving cell.