Coordinated WLAN Beam Width Selection for Spatial Reuse
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Solution Overview
Problem
In high-dense deployment scenarios of wireless local area networks (WLANs), co-channel interference increases due to the proximity of access points (APs), limiting the number of stations (STAs) that can participate in coordinated spatial reuse (CSR) and reducing system capacity.
Innovation Solution
A communication method where a sharing AP dynamically selects a beam width for coordinated transmission, sending a notification to a shared AP with coordinated transmission parameters, allowing the shared AP to choose a shared STA and beam width that minimize interference, thereby increasing the effective area for CSR.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of stationary object
If APs are deployed close to each other in high-dense scenarios, then network coverage is improved, but co-channel interference increases and spectrum efficiency decreases
Solution Approach 1:
The patent applies beam width dynamic adjustment by allowing the sharing AP to select from at least two adjustable beam widths (first beam width and second beam width) based on channel conditions and interference levels. This dynamic parameter adjustment resolves the contradiction by adapting the beam characteristics to balance coverage area and interference mitigation in high-dense deployments
Solution Approach 2:
The patent changes physical parameters of the transmitted signal by adjusting beam width and applying beamforming techniques. By modifying these transmission parameters, the system can maintain network coverage while reducing co-channel interference through directional transmission and spatial filtering
2Object-affected harmful factors
If the shared AP selects shared STAs from areas outside the overlapping area, then interference to the sharing AP's transmission link is reduced, but the number of STAs that can participate in CSR is limited
Solution Approach 1:
The patent dynamically adjusts the beam width of the sharing AP based on the selected shared STA's location and channel conditions. This allows the system to include STAs from overlapping areas in CSR by adapting the beam characteristics to manage interference, thereby increasing the number of participating STAs while maintaining link quality
Solution Approach 2:
The patent applies different beam widths to different spatial regions and transmission scenarios. By using first beam width for certain directions and second beam width for others, the system can selectively include or exclude areas from the overlapping region, allowing more STAs to participate in CSR while maintaining interference control through localized beam shaping
3Device complexity
If a fixed beam width is used for coordinated transmission, then the system complexity is reduced, but the effective area for CSR and system capacity are limited
Solution Approach 1:
The patent implements dynamic beam width selection where the sharing AP chooses between at least two adjustable beam widths based on channel measurement information and interference conditions. This dynamic approach increases system capacity and effective CSR area while maintaining reasonable complexity through predefined beam width options and standardized selection criteria
Data Source
AI summary
A communication method includes that a sharing AP selects a first beam width used to schedule a sharing STA during coordinated transmission, and the sharing AP sends a coordinated transmission notification to a shared AP, where the coordinated transmission notification includes a coordinated transmission parameter, where the coordinated transmission parameter is obtained based on the sharing STA and the first beam width, where the coordinated transmission notification indicates the shared AP to select, based on the coordinated transmission parameter, a shared STA and a second beam width that are used for coordinated transmission, where the second beam width is one of adjustable beam widths of the shared AP, and where the first beam width is one of at least two adjustable beam widths of the sharing AP.