WLAN Spatial Reuse Polling for Coordinated AP Transmissions
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Solution Overview
Problem
Existing wireless local area network (WLAN) systems face challenges in efficiently managing interference and improving throughput through coordinated reuse among un-managed access points, particularly in environments supporting extended high throughput (EHT) operations.
Innovation Solution
Implementing over-the-air signaling and polling procedures to identify and select groups of un-managed access points for coordinated reuse, allowing synchronous transmissions and reducing interference during transmission opportunities (TXOPs).
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If un-managed access points transmit independently without coordination, then device complexity is reduced and ease of operation is improved, but interference increases and system throughput deteriorates
Solution Approach 1:
The patent implements a feedback mechanism where access points exchange spatial reuse information through polling and response frames. The polling access point receives feedback from candidate access points about their transmission characteristics and interference levels, allowing coordinated selection of transmission parameters that optimize system throughput while maintaining operational simplicity.
Solution Approach 2:
The patent changes transmission parameters such as transmit power, modulation and coding scheme (MCS), and spatial reuse factors based on feedback from multiple access points. By dynamically adjusting these parameters through coordinated reuse, the system achieves higher throughput without requiring complex centralized control, thus resolving the contradiction between ease of operation and system throughput.
2Productivity
If access points perform coordinated reuse with polling procedures, then system throughput is improved and interference is reduced, but device complexity and signaling overhead increase
Solution Approach 1:
The patent enables access points to perform self-service coordination through autonomous polling and response mechanisms. Each access point independently measures its own transmission characteristics and responds to polling signals, allowing the system to achieve coordinated reuse without requiring complex external management or centralized control, thus reducing the increase in device complexity.
Solution Approach 2:
The patent employs periodic polling procedures where access points sequentially poll candidate access points for spatial reuse information. This periodic action allows systematic collection of transmission parameters and interference data in a structured manner, improving system throughput through coordination while keeping the complexity manageable through regular, predictable signaling intervals.
3Speed
If extended high throughput operations are implemented with wider channels, then data transmission speed is improved, but susceptibility to interference and signal strength variations increases
Solution Approach 1:
The patent applies local quality by tailoring transmission parameters such as transmit power and modulation and coding scheme (MCS) to the specific local conditions of each access point-to-station link. By adjusting these parameters based on feedback about signal strength and interference at each location, the system maintains high data transmission speeds while reducing susceptibility to interference through localized optimization.
Solution Approach 2:
The patent uses feedback mechanisms where access points report measured signal strength indicators (RSSI) and interference levels to the polling access point. This feedback enables the system to select optimal transmission parameters for extended high throughput operations, balancing data transmission speed with resistance to interference by adapting to actual channel conditions through coordinated reuse.
Data Source
AI summary
Techniques for improved spatial reuse for wireless local area network (WLAN) networks are described. An access point (AP) may win a contention to a wireless medium and obtain a transmission opportunity (TXOP). The AP may perform a procedure to identify a group of un-managed APs for participation in spatial reuse opportunities for synchronous transmission over the TXOP. The AP may perform the procedure using over-the-air signaling. The AP may transmit a spatial reuse (SR) poll frame to one or more un-managed APs of the network, either sequentially or as part of a multiple-AP procedure. The AP may receive an SR response frame, or directly measure potential interference of a station (STA) serviced by one or more un-managed APs, and select a group of APs for coordinated reuse over the TXOP. The AP may select the group of APs based on one or more criteria for coordinated reuse.