Coordinated Beamforming Signaling for EMLSR Station Compatibility
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Solution Overview
Problem
The IEEE 802.11bn standard introduces coordinated beamforming (CoBF) for simultaneous data transmission by multiple APs, but existing proposals fail to address how to support Enhanced Multilink Single-Radio (EMLSR) stations (STAs) within this sequence, specifically regarding the insertion of Initial Control Frames (ICFs) and switching modes, ensuring proper navigation and acknowledgement from STAs.
Innovation Solution
The proposed solution involves a three-phase CBF data transmission sequence with synchronized APs exchanging channel training and user scheduling information, using modified trigger frames to ensure EMLSR STAs can participate effectively, and implementing enhanced signaling to differentiate CoBF transmissions for proper navigation and acknowledgement.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If coordinated beamforming is implemented for simultaneous data transmission by multiple APs, then data transmission efficiency is improved, but compatibility with EMLSR stations is lost
Solution Approach 1:
The patent applies preliminary action by inserting Initial Control Frames (ICFs) before the coordinated beamforming data transmission. These ICFs prepare EMLSR stations in advance by signaling them to switch to appropriate reception modes, ensuring they are ready to receive and process the subsequent CoBF transmissions properly. This preliminary preparation resolves the compatibility issue while maintaining the efficiency benefits of CoBF.
Solution Approach 2:
The patent uses modified trigger frames and control signaling as intermediaries between the coordinated beamforming system and EMLSR stations. These intermediary signals carry necessary information about the CoBF transmission parameters, allowing EMLSR stations to interpret and respond to the coordinated transmission appropriately, thus bridging the compatibility gap.
2Stability of the object's composition
If standard CBF sequence is used, then transmission synchronization is achieved, but EMLSR station participation is not supported
Solution Approach 1:
The patent segments the coordinated beamforming transmission into distinct phases: an initial control frame phase followed by the data transmission phase. This segmentation allows EMLSR stations to process control information separately from data, enabling them to participate effectively while maintaining the synchronization required for CoBF operation.
Solution Approach 2:
The patent introduces dynamic mode switching for EMLSR stations based on the received ICF signals. Stations can dynamically adjust their reception capabilities and operational modes in response to the control frames, allowing them to adapt to the synchronized CoBF transmission requirements in real-time.
Data Source
AI summary
This disclosure describes systems, methods, and devices related to coordinated beamforming between multiple access points using a transmission opportunity of one access point shared with at least one additional access point. The access points may exchange information to coordinate transmissions of data to associated station devices, and may provide signaling to each other and to the station devices regarding the coordinated beamforming operation.