NR-U Terminal LBT Feedback and Parameter Configuration
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Solution Overview
Problem
NR-U terminals operating on unlicensed frequency bands face a high probability of Listen Before Talk (LBT) failure due to increased interference, leading to performance degradation and increased power consumption, as they need to compete for access and meet regulatory requirements differently than those on licensed bands.
Innovation Solution
An information configuration method where a base station sends a reporting request to an NR-U terminal to report LBT information, which includes failure data, allowing for parameter configuration to reduce LBT failure probability, such as increasing the random access response waiting window in high failure areas.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If NR-U terminals operate on unlicensed frequency bands following LBT mechanism, then regulatory compliance is achieved, but LBT failure probability increases due to interference
Solution Approach 1:
The patent implements a feedback mechanism where terminals report LBT failure information to the base station. The base station collects LBT failure data from multiple terminals and uses this feedback to identify high failure probability areas, then adjusts parameters accordingly to improve future LBT success rates.
Solution Approach 2:
The patent dynamically changes transmission parameters based on LBT failure statistics. When high LBT failure probability areas are identified, the base station increases the random access response waiting window parameter for affected terminals, allowing them to wait longer for LBT opportunities and thereby improving LBT success rates in interference-prone areas.
2Reliability
If terminals perform LBT mechanism on unlicensed frequency bands, then regulatory requirements are met, but power consumption increases
Solution Approach 1:
The patent optimizes power consumption by dynamically adjusting the random access response waiting window parameter. In areas with high LBT failure probability, terminals are configured with extended waiting windows, reducing the need for repeated LBT attempts and thereby lowering overall power consumption while maintaining regulatory compliance.
3Reliability
If base station configures parameters based on LBT failure data, then LBT failure probability decreases, but system complexity increases
Solution Approach 1:
The patent uses feedback from terminal reports to automatically identify high LBT failure probability areas and trigger parameter adjustments. This feedback-driven approach automates the parameter configuration process, reducing manual intervention while improving LBT success rates in affected areas.
Solution Approach 2:
The patent applies parameter changes locally to specific terminals or cell groups experiencing LBT failures rather than uniformly across the entire network. By identifying high failure probability areas and targeting parameter adjustments only to affected terminals, the system improves LBT success rates while minimizing unnecessary complexity in areas with normal performance.
Data Source
AI summary
An information configuration method including: transmitting an information reporting request to a terminal working in an unlicensed frequency band, wherein the information reporting request is used for requesting the terminal to report listen before talk (LBT) information: receiving the LBT information that is reported by the terminal according to the information reporting request; and performing parameter configuration on the terminal according to the LBT information.