WLAN Uplink MU-MIMO Station Selection via SNR Reduction
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Solution Overview
Problem
Current WLAN systems face limitations in maximizing throughput in uplink multiple user multiple input multiple output (UL MU-MIMO) mode due to inefficient channel vector projection and SNR reduction, leading to suboptimal performance in channel access and data transmission.
Innovation Solution
The proposed method involves selecting stations based on SNR reduction values, using channel information to project channel vectors orthogonally, and adjusting backoff counter values to optimize contention rounds, allowing for improved channel access and data transmission in UL MU-MIMO mode.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If stations transmit simultaneously in UL MU-MIMO mode, then system throughput is improved, but channel interference increases causing SNR reduction
Solution Approach 1:
The patent applies local quality by selecting specific stations with favorable channel conditions for simultaneous transmission. Stations are evaluated based on their individual channel vectors and SNR characteristics, allowing only those with suitable local channel properties to participate in MU-MIMO transmission, thereby maintaining high throughput while controlling interference
Solution Approach 2:
The patent changes the parameter selection criteria for station participation in MU-MIMO. By introducing SNR reduction values as a selection parameter and using backoff counter mechanisms, the system dynamically adjusts which stations transmit simultaneously based on current channel conditions, resolving the contradiction between throughput and interference
2Productivity
If more stations are selected for simultaneous transmission, then system capacity is improved, but contention complexity increases
Solution Approach 1:
The patent segments the contention process into multiple rounds with different purposes. The first round uses traditional backoff counters for basic access, while the second round uses SNR-based selection for optimized MU-MIMO participation. This segmentation simplifies the overall complexity by dividing the challenging multi-station selection into manageable stages
Solution Approach 2:
The patent performs preliminary channel assessment and SNR calculation before the actual transmission contention. Stations pre-evaluate their channel vectors and SNR reduction values, allowing the AP to make informed decisions about which stations should participate in simultaneous transmission, thereby reducing contention complexity while maintaining high system capacity
3Reliability
If channel vector projection is performed to reduce interference, then signal quality is improved, but computational overhead increases
Solution Approach 1:
The patent applies partial action by performing channel vector projection only for stations selected to participate in MU-MIMO transmission, rather than for all stations. This selective approach maintains signal quality for the relevant stations while significantly reducing the overall computational overhead in the system
Data Source
AI summary
A method of operating a wireless local area network (WLAN) system is provided. The WLAN includes an access point supporting uplink multiple user multiple input multiple output mode. The method of operating the WLAN system includes selecting a first station, receiving channel information from the selected first station by a second station, calculating a SNR reduction value based on the channel information by the second station, and selecting the second station based on the SNR reduction value.