Spatial Reuse Trigger Frame for WLAN Interference Control
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Solution Overview
Problem
In high-density WLAN environments, the conventional IEEE 802.11 system faces challenges in maintaining high-quality transmission due to radio medium interference, leading to reduced communication capacity and potential frame transmission failures.
Innovation Solution
An electronic device with a processor configured to determine an allowable interference level for spatial reuse between adjacent Basic Service Sets, determining uplink transmission configurations, and transmitting a trigger frame to manage interference and optimize radio medium usage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If spatial reuse is implemented to increase radio medium utilization, then communication capacity is improved, but interference between links increases causing frame transmission failures
Solution Approach 1:
The patent applies preliminary action by having the first terminal transmit a trigger frame before actual data transmission to announce its intent to occupy the radio medium. This allows the egress AP to prepare appropriate response frames in advance, ensuring that when the first terminal actually transmits data, the interference level is already controlled and the second terminal's spatial reuse opportunity is properly managed. This prevents frame transmission failures by establishing communication protocols beforehand.
Solution Approach 2:
The patent implements feedback through the trigger frame mechanism where the first terminal sends a trigger frame to the egress AP, which then responds with a response frame containing interference level information. This feedback loop allows the system to dynamically adjust transmission parameters based on actual interference conditions, ensuring reliable frame transmission while maintaining high communication capacity through spatial reuse.
2Productivity
If spatial reuse allows adjacent APs to re-occupy radio medium, then radio medium efficiency is improved, but interference control becomes more difficult
Solution Approach 1:
The patent extracts the interference control function from the complex spatial reuse mechanism by introducing a dedicated trigger frame that separates the occupancy announcement from the actual data transmission. This extraction allows the egress AP to handle interference control independently through the response frame, simplifying the overall interference management process while maintaining high radio medium efficiency through spatial reuse.
Solution Approach 2:
The trigger frame acts as an intermediary between the first terminal and the egress AP, facilitating coordinated spatial reuse without direct interference control complexity. The trigger frame carries occupancy information that the egress AP uses to determine appropriate response frames, effectively mediating the interference control process and enabling efficient radio medium sharing between adjacent APs.
3Object-affected harmful factors
If trigger frame transmission is used to control spatial reuse, then interference level is improved, but transmission overhead increases
Solution Approach 1:
The patent applies partial action by transmitting only the essential trigger frame information when spatial reuse is needed, rather than continuously transmitting control signals. The trigger frame contains only the necessary occupancy announcement and control parameters, minimizing transmission overhead while effectively controlling interference levels. This partial action approach reduces energy consumption compared to continuous control signaling.
Data Source
AI summary
Various embodiments of the present invention disclose a spatial reuse method and apparatus in a wireless local area network (WLAN) system. According to various embodiments of the present invention, an electronic device comprises a communication circuit for wireless communication with at least one external device and a processor operatively connected to the communication circuit, wherein the processor may determine an allowable interference level for spatial reuse in association with an adjacent basic service set (BSS) in a network environment where a plurality of electronic devices operate, determine a configuration to be used during uplink transmission by at least one mobile device connected to the electronic device on the basis of the adjacent BBS allowing the determined interference level, and transmit a trigger frame including the determined configuration to the mobile device by using the communication circuit. Various embodiments are possible.