LBT Failure Detection via Direction-Specific Counters
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Solution Overview
Problem
Current wireless communication systems face challenges in failure detection and recovery mechanisms for channel sensing, particularly in scenarios involving beamforming, multiple Transmit-Receive Points (TRPs), multiple antenna panels, and directional antennas, which affect the reliability of transmission in unlicensed spectra.
Innovation Solution
A method is introduced where Q indexes correspond to Q types of channel sensing or TRPs, with Q timers used for failure detection, allowing for effective channel or LBT failure detection and recovery, improving transmission reliability by monitoring signaling and resetting counters when thresholds are exceeded.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If Listen Before Talk (LBT) technology is employed under omnidirectional antennas to avoid interferences in unlicensed spectrum, then channel access reliability is improved, but the system cannot support beamforming and directional transmission which are needed for 5G NR
Solution Approach 1:
The patent segments the channel sensing process by introducing separate counters for different beam directions (first counter for first beam direction, second counter for second beam direction). Each beam direction is independently monitored and managed, allowing the system to maintain LBT reliability while supporting multiple beamforming directions simultaneously.
Solution Approach 2:
The patent adds a spatial dimension to the channel sensing mechanism by associating different counters with different beam directions. This transforms the traditional single-channel counter into a multi-dimensional structure that accounts for both frequency channel and spatial beam direction, enabling beamforming compatibility while maintaining LBT functionality.
2Device complexity
If a single counter is used for LBT failure detection in omnidirectional mode, then the mechanism is simple to implement, but it cannot effectively detect failures in specific beam directions for beamforming scenarios
Solution Approach 1:
The patent divides the single counter into multiple direction-specific counters (first counter, second counter, etc.), each responsible for monitoring LBT failures in specific beam directions. This segmentation enables precise failure detection per beam while maintaining manageable system complexity through structured counter management.
Solution Approach 2:
The patent applies local quality by making each counter specialized for its corresponding beam direction. Instead of a generic counter, each counter is locally optimized to monitor specific spatial directions, improving measurement precision for beam failure detection without significantly increasing overall complexity.
3Measurement precision
If multiple counters are introduced for different beam directions to improve failure detection precision, then beamforming support is enabled, but the device complexity increases
Solution Approach 1:
The patent creates a universal counter management mechanism that handles multiple direction-specific counters through a unified reset process. When beam failure is detected in any direction, the system can trigger a unified counter reset that applies to all counters, reducing management complexity while maintaining precise per-direction monitoring capabilities.
Solution Approach 2:
The patent implements feedback mechanisms where counter values are monitored and compared against thresholds to detect beam failures. This feedback loop provides automatic failure detection and triggers recovery procedures, reducing the need for complex manual management while maintaining high detection precision across multiple beam directions.
Data Source
AI summary
The disclosure provides a method and a device in a node for wireless communication. A first node performs a first listening in a first subband; when the first listening indicates that a channel is busy, the first node determines to give up a radio transmission on a first channel, starts a first timer and updates a first counter by 1; when any one of Q timers expires, the first node resets the first counter to an initial value; and when the first counter reaches or exceeds a target threshold, the first node transmits a first signal. The first channel belongs to the first subband in frequency domain, the first listening is correlated to a first index, and the first index is any one of Q indexes; the Q indexes are one-to-one corresponding to the Q timers respectively.