Cell Reselection Triggering for LBT Failure in 5G NR
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Solution Overview
Problem
In 5G NR communication systems using unlicensed spectrums, consecutive Listen-Before-Talk (LBT) failures lead to delays in information transmission and affect communication quality, as existing techniques continue to attempt LBT despite failures or wait for a period of time without triggering cell reselection.
Innovation Solution
A method and device for triggering cell reselection based on determining consecutive LBT failures exceeding a preset threshold, where target cells are identified and ranked by signal quality and priority, allowing timely reselection to improve communication quality.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the UE continues to attempt LBT after consecutive failures, then the LBT retry mechanism is maintained, but the information transmission delay increases significantly
Solution Approach 1:
The patent applies preliminary action by establishing LBT failure detection and cell reselection triggering mechanisms before actual communication failure occurs. The UE proactively monitors LBT success/failure states and pre-configures cell reselection parameters, allowing it to switch cells before the current cell becomes completely unusable, thereby reducing transmission delay while maintaining reliability
Solution Approach 2:
The patent introduces cell reselection as an intermediary mechanism between LBT failure and complete communication breakdown. Instead of directly retrying LBT on the same cell (which causes delay), the UE uses cell reselection as a middle step to switch to an alternative cell, thus mediating the conflict between maintaining retry reliability and reducing transmission delay
2Object-affected harmful factors
If the UE waits for a period of time after LBT failures, then the LBT failure impact is reduced, but the communication quality deteriorates due to delay
Solution Approach 1:
The patent applies dynamics by making the UE's cell reselection behavior adaptive rather than static. The UE dynamically adjusts its cell reselection timing and parameters based on real-time LBT failure detection, converting the fixed waiting period approach into a flexible, condition-based response that reduces communication quality deterioration while still mitigating LBT failure impact
3Loss of time
If cell reselection is triggered timely after LBT failures, then the information transmission delay is reduced, but the device complexity increases
Solution Approach 1:
The patent applies self-service by enabling the UE to autonomously detect LBT failures and trigger cell reselection without extensive network intervention. The UE independently monitors its own LBT status, evaluates reselection conditions, and executes cell switching, thereby reducing transmission delay while limiting complexity growth to only what is necessary for self-monitoring and self-decision-making
Data Source
AI summary
A method and device for triggering cell reselection, a storage medium, and a user terminal are provided. The method comprises: when a request to establish or resume an RRC connection is initiated, determining whether the number of consecutive LBT failures exceeds a preset threshold; and if the number of consecutive LBT failures exceeds the preset threshold, performing cell reselection in response.