UE LBT Failure Reporting with Dynamic Parameter Sets
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Solution Overview
Problem
The challenge in wireless communication systems is efficiently managing limited radio resources to handle increased data and control information transmission while minimizing latency and delay, particularly in applications sensitive to performance degradation due to these factors.
Innovation Solution
A method and apparatus for performing Listen Before Talk (LBT) procedures by user equipment (UE) that involves detecting LBT failures based on a first failure parameter set, receiving a second set, and transmitting a report if the second set requires more frequent reporting, with adjustments to timers and count values based on the parameter sets.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of time
If LBT failure report frequency is increased to improve network responsiveness, then latency is reduced, but device complexity and signaling overhead increase
Solution Approach 1:
The patent implements dynamic adjustment of LBT failure report frequency by introducing two different parameter sets (first and second LBT failure parameter sets) that can be switched based on current network conditions and failure severity. The UE transitions from a first LBT failure parameter set with lower report frequency to a second LBT failure parameter set with higher report frequency when LBT failures are detected, allowing the system to adapt reporting behavior to actual needs rather than using a fixed configuration.
Solution Approach 2:
The patent changes key parameters (report frequency, timer values, count values) of the LBT failure reporting mechanism based on detected failure conditions. When LBT failures are detected, the UE applies a second parameter set that modifies these values to increase reporting frequency, enabling the system to respond dynamically to changing conditions while avoiding unnecessary high-frequency reporting when the channel is clear.
2Reliability
If LBT failure detection sensitivity is increased to improve reliability, then failure detection accuracy improves, but false alarms increase
Solution Approach 1:
The patent employs preliminary action by configuring multiple LBT failure parameter sets in advance, each optimized for different detection scenarios. The first parameter set uses less sensitive detection thresholds for normal operation, while the second parameter set uses more sensitive thresholds when failures are detected. This staged approach allows the system to maintain high reliability when needed while avoiding false alarms during normal operation.
Solution Approach 2:
The patent implements feedback mechanisms where the UE continuously monitors LBT outcomes and adjusts its detection sensitivity accordingly. When LBT failures are detected using the first parameter set, the system transitions to the second parameter set with higher sensitivity for continued monitoring. This feedback-driven adaptation allows the system to maintain high detection reliability while automatically reducing false alarms by adjusting sensitivity based on actual channel conditions.
Data Source
AI summary
The present invention relates to a method of performing a Listen Before Talk (LBT) procedure by a user equipment (UE) in a wireless communication system. Especially, the method includes the steps of detecting a LBT failure based on a first LBT failure parameter set; receiving a second LBT failure parameter set before transmitting a LBT failure report; and if the second LBT failure parameter set requires more frequent LBT failure report than the first LBT failure parameter set, transmitting the LBT failure report related to the LBT failure.