Directional LBT Sensing Beam Channel Occupancy Control
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Solution Overview
Problem
In the context of directional Listen Before Talk (LBT) technology, determining the channel occupy time for unlicensed channels is a challenge, especially in high-frequency bands where multiple beams are used for data transmission, affecting spatial selectivity and channel detection efficiency.
Innovation Solution
The method involves performing a Listen Before Talk (LBT) detection on at least one sensing beam, where each sensing beam corresponds to a specific channel occupy time, allowing the sending end device to determine the occupancy time for the unlicensed channel, and using the channel accordingly, enabling reasonable duration control and improved spatial selectivity and channel detection efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If directional LBT is used with multiple beams for data transmission in high-frequency bands, then spatial selectivity is improved, but determining channel occupy time becomes more complex and challenging
Solution Approach 1:
The patent segments the channel occupy time determination into separate components for each sensing beam. Each beam's LBT detection result and corresponding channel occupy time are independently determined, allowing the system to handle multiple beams without increasing overall complexity. The network device or terminal device determines channel occupy time for each beam separately based on its LBT detection result, then manages uplink grant transmission for each beam independently.
2Ease of operation
If omnidirectional LBT is used for channel detection, then channel detection simplicity is maintained, but spatial selectivity and channel detection efficiency deteriorate in high-frequency bands
Solution Approach 1:
The patent transitions from omnidirectional LBT to directional LBT by introducing a spatial dimension to channel detection. Instead of detecting channels in all directions simultaneously, the system performs LBT detection on specific sensing beams in different directions. This dimensional change improves spatial selectivity and channel detection efficiency while maintaining manageable complexity through separate determination of channel occupy time for each beam.
3Productivity
If channel occupy time is extended to allow more data transmission, then productivity is improved, but the risk of interference with other users increases
Solution Approach 1:
The patent applies local quality by determining channel occupy time separately for each sensing beam based on its specific LBT detection result. Instead of using a uniform channel occupy time for all beams, the system tailors the channel occupy time to each beam's local channel conditions. This allows the system to maximize data transmission in directions where the channel is clear while minimizing interference in directions where other users are present, thereby improving productivity while reducing harmful interference.
Data Source
AI summary
A method for using an unlicensed channel includes: performing a listen before talk (LBT) detection on at least one sensing beam, where each sensing beam corresponds to a channel occupy time (COT); and after an idle unlicensed channel is detected on any sensing beam, using the unlicensed channel according to the COT corresponding to the sensing beam.