Cross-Band Beamforming Frame Exchange for 6 GHz Coverage
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Solution Overview
Problem
Wireless Local Area Network (WLAN) devices face performance degradation due to increased interference from neighboring devices and the need to support diverse applications, particularly video traffic, with the 6 GHz frequency band having a smaller coverage than the 5 GHz band, necessitating improved beamforming techniques to enhance coverage and reliability.
Innovation Solution
A method for beamforming that includes transmitting control information frames, such as the null data packet announcement (NDPA) frame, in a different frequency band than the beamformed data frames, and using acknowledgement features to ensure correct reception, particularly in the 6 GHz band where power spectral density requirements are stringent.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of stationary object
If beamformed transmissions are used in the 6 GHz frequency band, then transmission coverage is improved, but control information exchange reliability deteriorates due to lower transmit power spectral density
Solution Approach 1:
The patent segments the communication into two distinct parts: control information exchange and data transmission. Control frames (NDPA, NDP, CBF/CQI) are transmitted in the 5 GHz band where higher power spectral density ensures reliable exchange, while beamformed data transmission occurs in the 6 GHz band to achieve extended coverage. This segmentation allows each function to operate in the optimal frequency band.
Solution Approach 2:
The 5 GHz frequency band acts as an intermediary medium for control information exchange that facilitates the beamforming process in the 6 GHz band. By using the 5 GHz band as a mediator for establishing beamforming parameters through reliable control frame exchange, the system enables subsequent high-coverage data transmission in the 6 GHz band without compromising control reliability.
2Object-affected harmful factors
If transmit power spectral density is reduced in the 6 GHz band, then interference to neighboring devices is reduced, but transmission range deteriorates
Solution Approach 1:
The patent applies different quality characteristics to different frequency bands based on their local requirements. The 6 GHz band uses lower power spectral density to minimize interference (local quality for interference reduction), while the 5 GHz band uses higher power spectral density to ensure reliable control frame exchange (local quality for reliability). Beamforming technology is applied locally in the 6 GHz band to compensate for the reduced power and maintain transmission range.
3Device complexity
If control information frames are transmitted in the same frequency band as beamformed data, then system complexity is reduced, but transmission reliability deteriorates in the 6 GHz band
Solution Approach 1:
The patent segments the communication functions into control plane and data plane, transmitting them in separate frequency bands. Control information frames (NDPA, NDP, CBF/CQI) are segmented to be transmitted in the 5 GHz band, while beamformed data is segmented to be transmitted in the 6 GHz band. This segmentation ensures that control reliability is not compromised by the lower power conditions in the 6 GHz band.
Solution Approach 2:
The 5 GHz frequency band serves as an intermediary channel for all control information exchange, including NDPA, NDP, and CBF/CQI frames. This intermediary approach ensures that control frames benefit from the higher power spectral density of the 5 GHz band, guaranteeing reliable transmission while enabling beamforming operations in the 6 GHz band.
Data Source
AI summary
A method is performed by a wireless device functioning as a beamformer station (STA) in a wireless network to perform a sounding procedure. The method includes wirelessly transmitting a null data packet (NDP) announcement frame in a first frequency band, the NDP announcement frame including a sounding dialog token field where bits B0 and B1 of the sounding dialog token field are set to binary ‘0’ to indicate the NDP announcement frame should be processed as a very high throughput (VHT) NDP announcement frame and wirelessly transmitting an NDP frame in a second frequency band, where the first and the second frequency bands are separated by at least one Gigahertz (GHz).