MU-MIMO Beamforming Training via Targeted Station Identification
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Solution Overview
Problem
Current MU-MIMO beamforming training methods in WLAN systems face challenges in efficiently supporting specific responders without increasing signaling overhead, particularly in channel bonding and MIMO techniques across multiple channels.
Innovation Solution
The method involves a station (STA) receiving a MIMO beamforming setup frame and a Beam Refinement Protocol (BRP) frame, where the station identification information matches the STA's MAC address, allowing for targeted MU-MIMO beamforming training, and includes a TRN subfield for feedback, enabling efficient beamforming without unnecessary signaling.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If MU-MIMO beamforming training is performed for all responders, then beamforming coverage is improved, but signaling overhead increases
Solution Approach 1:
The patent segments the MU-MIMO beamforming training process by introducing a MIMO beamforming setup frame that identifies specific responders (via AID values) who should participate in the training. This segmentation allows the system to perform beamforming training only for designated responders rather than all responders, thereby reducing signaling overhead while maintaining reliable beamforming coverage for the intended targets.
2Quantity of substance
If beamforming training is performed for specific responders only, then signaling overhead is reduced, but beamforming reliability may deteriorate
Solution Approach 1:
The patent employs preliminary action by including station identification information (AID values) in the MIMO beamforming setup frame before the actual beamforming training begins. This preliminary identification step ensures that only the intended specific responders participate in the subsequent BRP frame exchange, preventing unnecessary signaling while guaranteeing that beamforming training is performed for the correct stations, thus maintaining reliability.
3Manufacturing precision
If BRP frames are transmitted to all stations, then training completeness is improved, but transmission efficiency deteriorates
Solution Approach 1:
The patent applies local quality by making the BRP frame transmission targeted rather than universal. The MIMO beamforming setup frame contains station identification information that specifies which particular responders should receive and process the subsequent BRP frames. This localized approach ensures that beamforming training is completed for the intended stations (maintaining training completeness) while avoiding wasteful transmissions to unrelated stations (improving transmission efficiency).
Data Source
AI summary
The present invention relates to a method for performing MU-MIMO beamforming training, the method comprising: receiving a MIMO beamforming setup frame including identification information of a station participating in MU-MIMO beamforming training, in an MU-MIMO beamforming setup subphase; receiving a BRP frame in an MU-MIMO beamforming training subphase; and performing MU-MIMO beamforming training using the BRP frame, if the identification information of the station included in the MIMO beamforming setup frame responds to the STA and a TA field and an RA field of the BRP frame are the same as a MAC address of an initiator that has transmitted the MIMO beamforming setup frame.