Multi-BWP Listen-Before-Talk Alignment for Reliable Channel Access
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Solution Overview
Problem
Conventional listen before talk (LBT) techniques in wireless communication systems, particularly in the 5 GHz and 6 GHz unlicensed spectrum, lead to inefficient channel access and increased delay due to the lack of deterministic channel access across multiple bandwidth parts (BWPs), as they do not account for the type of devices or protocols using the channel and result in unsuccessful simultaneous access to multiple BWPs.
Innovation Solution
A wireless base station employs multiple listen before talk operations to monitor and align the use of multiple BWPs, acquiring access rights to one BWP before another, and communicates via a grant/revoke mechanism to prevent competing stations from using the first BWP, ensuring simultaneous and efficient use of both BWPs.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of time
If conventional listen before talk techniques are used to monitor wireless channels, then channel access delay is reduced, but the reliability of successful channel access deteriorates due to lack of deterministic access across multiple bandwidth parts
Solution Approach 1:
The patent segments the wireless channel monitoring into multiple independent LBT operations, each dedicated to a specific bandwidth part. This allows parallel monitoring and acquisition of multiple BWPs, reducing overall access delay while maintaining reliable access to at least one BWP through diversified monitoring attempts
Solution Approach 2:
The patent performs preliminary channel monitoring and acquisition attempts on multiple bandwidth parts before actual data transmission. By pre-acquiring multiple BWPs through preliminary LBT operations, the system ensures that at least one BWP is ready for immediate use, reducing access delay while guaranteeing reliable access
2Productivity
If multiple bandwidth parts are monitored simultaneously using independent LBT operations, then the productivity of channel access is improved, but the device complexity increases
Solution Approach 1:
The patent merges multiple independent LBT operations into a unified monitoring framework that manages multiple bandwidth parts simultaneously. By combining the monitoring functions into a single coordinated system rather than separate independent systems, the patent improves channel access productivity while controlling device complexity through resource sharing and coordinated management
3Reliability
If a wireless station acquires access rights to one BWP before another, then the reliability of channel access is improved, but the loss of time increases due to sequential acquisition
Solution Approach 1:
The patent employs periodic monitoring and acquisition attempts across multiple bandwidth parts, where each BWP is monitored in periodic intervals rather than strictly sequentially. This allows the system to maintain reliable access by periodically checking and acquiring BWPs, reducing the overall time loss compared to pure sequential acquisition while ensuring at least one BWP is reliably accessed
Data Source
AI summary
A system includes multiple techniques of implementing listen before talk functionality to provide multiple mobile communication devices connectivity with a wireless base station.