Wideband WLAN Feedback Subcarrier Index Configuration
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Solution Overview
Problem
Current wireless local area network (WLAN) systems face challenges in efficiently transmitting feedback frames for multi-user multiple input multiple output (MU MIMO) in wideband channels, particularly in Extreme High Throughput (EHT) standards, which require improved signaling techniques to effectively utilize increased spatial streams.
Innovation Solution
A method for transmitting feedback frames in a wideband WLAN system, specifically configuring indexes of feedback subcarriers for channel information to generate a precoding or beamforming matrix, using a contiguous or non-contiguous 160 MHz, 240 MHz, or 320 MHz band, and setting indexes for feedback subcarriers based on a specific bandwidth and tone plan.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If feedback subcarrier indexes are configured for wideband (240 MHz, 320 MHz) in EHT WLAN system, then channel information transmission efficiency is improved, but feedback frame structure complexity increases
Solution Approach 1:
The feedback subcarrier indexes are segmented into multiple groups based on different bandwidth configurations (20 MHz, 40 MHz, 80 MHz, 160 MHz, 240 MHz, 320 MHz). Each bandwidth has its own specific index range and configuration pattern, allowing the system to handle wideband feedback by dividing it into manageable segments corresponding to different subcarrier ranges.
Solution Approach 2:
Different parts of the feedback frame are assigned different qualities based on their function. The subcarrier index fields use different bit lengths depending on the bandwidth configuration, and specific bits are allocated for indicating feedback subcarrier spacing and tone plan, optimizing each section for its specific purpose rather than using a uniform structure.
2Productivity
If increased number of spatial streams are used in new WLAN standard, then throughput is improved, but signaling technique complexity increases
Solution Approach 1:
The feedback frame structure is designed to be universal across different bandwidth configurations and spatial stream numbers. The same frame format can accommodate 20 MHz to 320 MHz bandwidths and supports up to 8 spatial streams by using configurable fields such as feedback subcarrier spacing and tone plan indicators, eliminating the need for separate signaling mechanisms for different configurations.
Solution Approach 2:
The signaling technique uses parameter changes to adapt to different spatial stream configurations. By modifying parameters such as feedback subcarrier spacing, tone plan, and index ranges based on the actual bandwidth and spatial stream requirements, the system can efficiently support increased throughput without requiring fundamentally different signaling structures.
Data Source
AI summary
Proposed are a method and device for receiving a feedback frame for MIMO beamforming in a wide band in a wireless LAN system. Specifically, a reception STA receives an NDPA frame from a transmission STA. The reception STA receives an NDP frame from the transmission STA. The reception STA transmits a feedback frame to the transmission STA on the basis of the NDP frame. The feedback frame includes information about a feedback subcarrier for the wide band. When the wide band is a continuous 320 MHz band and the grouping value is Ng, the indexes of the feedback subcarrier are set to [−2036:Ng:−1540], [−1532:Ng:−1036], [−1012:Ng:−516], [−508:Ng:−12], [12:Ng:508], [516:Ng:1012], [1036:Ng:1532] and [1540:Ng:2036].