WLAN Spatial Reuse With Non-BSS Signal Recognition
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Solution Overview
Problem
Existing wireless communication systems face challenges in maximizing spectrum efficiency and minimizing collisions due to interference from hidden nodes and non-WiFi devices in dense communication environments, particularly in IEEE 802.11-based WiFi networks.
Innovation Solution
A spatial reuse method that classifies interference sources by detecting and categorizing signals from devices like microwave ovens, Bluetooth, and ZigBee, adjusting transmission power based on their negligible nature, and optimizing transmission opportunities to enhance spectrum efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If spatial reuse is performed by distinguishing between own cell and other cell transmissions, then spectrum efficiency is improved, but collisions caused by hidden nodes increase
Solution Approach 1:
The patent changes the parameter of signal detection by introducing a new signal detection mechanism that identifies whether a signal originates from a target BSS or non-BSS source. This parameter change allows the system to differentiate between relevant and irrelevant interference, enabling spatial reuse while avoiding hidden node collisions by only suppressing transmissions from non-BSS sources.
2Productivity
If APs are distributed densely to improve network efficiency, then service coverage is improved, but interference from overlapping communication environments increases
Solution Approach 1:
The patent applies local quality by treating different signal sources differently within the same communication environment. Own BSS signals are treated as desirable and allow spatial reuse, while non-BSS signals are treated as interference to be avoided. This localized differentiation enables dense AP deployment while managing interference through selective signal treatment based on BSS affiliation.
3Reliability
If transmission power is increased to overcome interference, then signal reliability is improved, but interference to other transmissions increases
Solution Approach 1:
The patent implements dynamic transmission power adjustment based on the detected signal type. When a non-BSS signal is detected, the system dynamically increases transmission power to maintain reliability. When only own BSS signals are present, the system dynamically reduces power to minimize interference. This dynamic adaptation resolves the contradiction by making power levels contingent on the communication environment.
Data Source
AI summary
A spatial reuse (SR) method in a wireless LAN (WLAN) system may be provided.The operating method according to an embodiment of the present disclosure may include: the SR system according to an embodiment of the present disclosure may include: detecting a new signal by receiving communication environment information, comparing strength of the new signal with a first threshold, determining whether the new signal is a target signal of the WLAN system based on the determination that the strength of the new signal exceeds the first threshold, determining whether the new signal is a negligible signal based on the determination that the new signal is not a target signal of the WLAN system and performing spatial reuse simultaneous transmission by adjusting transmission power based on the determination that the new signal is the negligible signal.