Dynamic CCA Level Adjustment for Spatial Reuse in Wireless LAN
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Solution Overview
Problem
Existing wireless communication systems face low efficiency in spatial bandwidth reuse between overlapping basic service sets (BSSs) due to fixed Clear Channel Assessment (CCA) levels, leading to inefficient channel utilization and communication performance loss.
Innovation Solution
A method is introduced to dynamically adjust the CCA level and transmit spatial reuse support information, allowing stations to determine channel busy or idle states based on adjusted CCA levels and improve spatial reuse efficiency by including SR indication information in trigger frames and physical protocol data units (PPDUs).
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If fixed CCA levels are used in existing wireless communication systems, then system simplicity is maintained, but spatial bandwidth reuse efficiency between overlapping BSSs deteriorates
Solution Approach 1:
The patent implements dynamic CCA level adjustment by introducing a CCA level adjustment value that can be dynamically changed based on channel conditions and BSS color information. Instead of using a fixed CCA level, the system calculates adjusted CCA levels dynamically for different OBSS scenarios, allowing stations to adapt their channel assessment thresholds in real-time to improve spatial reuse efficiency while maintaining manageable system complexity through structured adjustment mechanisms.
2Productivity
If dynamic CCA level adjustment is implemented to improve spatial reuse efficiency, then channel utilization improves, but system complexity increases
Solution Approach 1:
The patent changes the CCA level parameter dynamically by introducing a CCA level adjustment value that modifies the original fixed CCA level. This adjustment value is calculated based on received signal strength, BSS color information, and other channel conditions. The system maintains a structured approach where the adjusted CCA level = original CCA level + adjustment value, allowing dynamic adaptation without completely redesigning the CCA mechanism, thus balancing improved channel utilization with controlled system complexity.
Solution Approach 2:
The patent implements feedback mechanisms where stations continuously monitor channel conditions, received signal strengths, and BSS color information to dynamically adjust CCA levels. The system uses feedback from channel assessments and interference patterns to refine CCA adjustment values, creating a closed-loop control system that adapts to changing wireless environments while maintaining systematic complexity through structured feedback processing.
3Productivity
If spatial reuse support information is transmitted in trigger frames and PPDUs, then SR efficiency improves, but transmission overhead increases
Solution Approach 1:
The patent merges spatial reuse support information with existing trigger frames and physical protocol data units (PPDUs) by embedding BSS color information and CCA level adjustment values within these standard frame structures. Instead of creating separate dedicated signaling messages, the system combines SR support information with already-necessary control frames, thereby improving spatial reuse efficiency while minimizing additional transmission overhead through efficient information packing.
Data Source
AI summary
In an embodiment of the present invention, a method for indicating, by an access point (AP) associated with a first basic service set (BSS), spatial reuse (SR) in a wireless LAN (WLAN) system includes transmitting a trigger frame which requests uplink multi-user (UL MU) transmission of a plurality of stations (STAs) and receiving an UL MU physical protocol data unit (PPDU) generated based on the trigger frame from the plurality of STAs. The trigger frame may include SR indication information for indicating the SR of an overlapping BSS (OBSS) STA. The first high efficiency (HE)-signal (SIG) A field of the UL MU PPDU may include SR support information generated based on the SR indication information.