Downlink Oriented Channel Configuration for WLAN Interference
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Solution Overview
Problem
In high-density Wireless Local Area Networks (WLAN) systems, data transmission from an Access Point (AP) is delayed due to indirect control between Stations (STAs), leading to inefficiencies in signal interference management.
Innovation Solution
The establishment of primary and secondary wireless channels, with downlink-oriented channels configured to avoid overlap with adjacent Basic Service Sets (BSS), allowing for efficient data transmission by determining STA positions relative to other BSSs and adjusting transmission methods accordingly, such as using or omitting RTS/CTS frames based on overlap and data transmission load.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If indirect control between STAs is used for data transmission, then device complexity is reduced, but data transmission delay increases
Solution Approach 1:
The patent introduces a Downlink Oriented Channel as an intermediary mechanism that enables the AP to directly control and manage downlink transmissions to STAs. This mediator channel allows the AP to send control information and data efficiently without relying on indirect STA-to-STA control, thereby reducing transmission delay while maintaining manageable system complexity through centralized control.
2Productivity
If channel overlap with adjacent BSS is allowed, then channel utilization increases, but signal interference and collisions increase
Solution Approach 1:
The patent applies local quality by differentiating channel usage based on spatial location and BSS context. The Downlink Oriented Channel is configured with specific properties (non-overlapping frequencies) for areas where adjacent BSS interference is expected, while other channels can utilize overlap where appropriate. This localized adaptation optimizes channel utilization in each specific spatial context while preventing interference where necessary.
3Reliability
If RTS/CTS frames are always transmitted, then collision detection improves, but data transmission delay increases
Solution Approach 1:
The patent implements partial action by selectively applying RTS/CTS frame transmission only in specific scenarios through the Downlink Oriented Channel. Instead of universally transmitting these frames for all downlink transmissions, the system uses them partially - only when adjacent BSS overlap is detected or when collision risk is high - thereby maintaining adequate collision detection while minimizing the time overhead associated with these control frames.
Data Source
AI summary
The present document relates to a wireless communication system and, more particularly, to a method for establishing a wireless channel by an AP in a high-density wireless LAN system and to an apparatus therefor. The AP configured for this purpose can establish a primary channel and one or more secondary channels, establish one or more downlink oriented channels into one or more secondary channels, but without the one or more downlink oriented channels overlapping the primary channel of an adjacent basic service set (BSS), and transmit, to a station connected to the AP, the frame including establishment information on the established one or more downlink oriented channels.