Trigger-Based Implicit Feedback for Wi-Fi Beamforming
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Solution Overview
Problem
Current wireless communication technologies, such as Wi-Fi 6 and Wi-Fi 7, lack a defined implicit feedback frame exchange sequence for implicit transmit beamforming, limiting the ability to control the number of space-time streams and bandwidth in multiple-input-multiple-output (MIMO) channels, especially when access points have more antennas than supported by stations.
Innovation Solution
Implementing a trigger-based implicit feedback method using a mandatory trigger frame that allows access points to estimate steering matrices and control the number of receive space-time streams and bandwidth, enabling implicit transmit beamforming without additional sounding overhead, and being compatible with all Wi-Fi STAs compliant with Wi-Fi 6 and beyond standards.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If the AP uses more than the STA's supported maximum number of sounding dimensions to apply a steer matrix, then the AP can achieve more transmit beamforming gain, but there is no implicit feedback frame exchange sequence defined in the specifications for Wi-Fi 6 and Wi-Fi 7
Solution Approach 1:
The patent implements a feedback mechanism where the STA sends a feedback frame containing received signal power information for multiple spatial streams. The AP uses this feedback to determine which spatial streams to use for implicit beamforming, enabling the AP to utilize more antennas than the STA's sounding dimension capability while maintaining standard compliance.
Solution Approach 2:
The patent performs preliminary actions by having the STA report received signal power for multiple hypothetical spatial streams before actual data transmission. This allows the AP to pre-determine the optimal beamforming configuration without requiring explicit feedback during the data transmission phase.
2Power
If the AP uses spare antennas more than the STA's supported maximum number of sounding dimensions, then the AP can achieve more transmit beamforming gain, but there is almost no STA supporting the optional high-throughput physical-layer protocol data unit exchange for implicit transmit beamforming
Solution Approach 1:
The patent enables the STA to self-report its received signal power characteristics for multiple spatial streams, allowing the AP to autonomously determine the optimal beamforming configuration. This eliminates the need for complex optional protocols while maintaining backward compatibility with existing STAs.
Solution Approach 2:
The patent changes the parameter reporting mechanism from traditional sounding dimensions to received signal power reporting across multiple spatial streams. This parameter change enables the AP to flexibly configure beamforming based on actual channel conditions without requiring STA support for optional high-throughput protocols.
3Device complexity
If there is no implicit feedback frame exchange sequence defined, then the existing specifications remain simple, but there is no way to control the number of space-time streams and bandwidth to obtain full characterization of the MIMO channel
Solution Approach 1:
The patent introduces a feedback frame that carries received signal power information for multiple spatial streams. This feedback mechanism enables the AP to control the number of space-time streams and bandwidth parameters, achieving full MIMO channel characterization while maintaining relatively simple protocol structure.
Solution Approach 2:
The patent enables dynamic control of the number of spatial streams and bandwidth based on channel conditions and feedback information. The AP can adaptively adjust these parameters to optimize beamforming performance while obtaining comprehensive channel characterization.
Data Source
AI summary
Techniques pertaining to trigger-based (TB) implicit feedback for implicit beamforming in wireless communications are described. An apparatus (e.g., an access point (AP)) triggers each of one or more stations (STAs) to transmit a respective feedback. The apparatus estimates a respective steering matrix with respect to each of the one or more STAs based on the respective feedback. The apparatus then transmits a respective steered data to each of the one or more STAs based on the respective steering matrix.