Unified Beamforming Matrices to Reduce Multi-Link Sounding Overhead
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Solution Overview
Problem
Existing wireless networking technologies face inefficiencies in multi-link operations due to redundant beamforming sounding sequences across multiple links, leading to excessive airtime consumption and temporal decay, which affects accuracy and overall network performance.
Innovation Solution
Unified beamforming matrix techniques are employed to aggregate beamforming matrices across multiple links into a single matrix, reducing redundant feedback by transmitting data on a single link, thereby minimizing overhead and improving gain.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If beamforming sounding sequences are performed across multiple links independently, then channel estimation accuracy is improved, but beamforming overhead and airtime consumption increase excessively
Solution Approach 1:
The patent combines beamforming sounding operations across multiple links by transmitting a single NDP containing beamforming information for all links simultaneously. The receiver aggregates beamforming matrices from multiple links into a unified structure, eliminating redundant sounding sequences and reducing overall overhead while maintaining accurate channel estimation across all links.
2Measurement precision
If beamforming sounding is performed on each link separately, then link-specific channel characteristics are captured accurately, but temporal decay between sounding sequences reduces overall accuracy
Solution Approach 1:
The patent performs preliminary channel estimation by transmitting the NDP before actual data transmission begins. The beamforming sounding is completed in advance for all links, allowing the system to capture channel characteristics while they are still stable, thereby preventing temporal decay from affecting measurement accuracy.
Solution Approach 2:
By combining all link-specific beamforming matrices into a unified beamforming structure within a single sounding sequence, the patent eliminates the temporal gaps between separate sounding operations. This unified approach captures all link characteristics simultaneously, preventing temporal decay from degrading measurement accuracy.
3Loss of information
If compressed beamforming feedback frames are transmitted on all links, then feedback completeness is ensured, but transmission overhead and time consumption increase
Solution Approach 1:
The patent merges feedback transmission by consolidating compressed beamforming feedback frames from multiple links into a single transmission opportunity. The unified beamforming matrix contains aggregated feedback information for all links, allowing the receiver to obtain complete feedback without requiring separate transmissions on each link, thereby reducing total transmission time.
Solution Approach 2:
The single NDP and corresponding feedback frame serve multiple functions simultaneously: they carry beamforming information for all links, enable channel estimation across multiple links, and provide feedback for all links in one operation. This multi-functionality eliminates the need for separate feedback transmissions for each link.
Data Source
AI summary
In various embodiments described herein, network devices, such as clients and access points (APs) can conduct an association or sounding process utilizing a unified beamforming matrix. As wireless network associations are increasingly utilizing multiple links, processes that are typically done for each link can become redundant. In response, embodiments described herein can unify, compress, or otherwise streamline beamforming operations across multiple links into one link. For example, beamforming over multiple links can traditionally require data to be exchanged on each link. The beamforming parameters can instead, in many embodiments, transmit beamforming data or matrices on a single link that comprises a unified beamforming matrix, which can reduce the amount of data that is transmitted, and reduce temporal decay by packaging and transmitting data together instead of transmitting over each and every link. This can improve overall network performance and increase transmission efficiency.