Cross-Band Beamforming Feedback for Lower-Latency WLAN
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Solution Overview
Problem
Existing wireless LAN systems face challenges in efficiently performing beamforming operations, particularly at sub-7 GHz and 60 GHz frequencies, leading to increased overhead and latency in signal transmission and reception.
Innovation Solution
A method and device for transmitting and receiving beamforming feedback matrices between stations (STAs) within different frequency bands, allowing configuration of antenna settings based on beamforming-related information to optimize communication.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If beamforming operations are performed at 60 GHz frequency band, then transmission rate and bandwidth are improved, but overhead and latency increase due to complex beam training procedures
Solution Approach 1:
The patent performs beamforming feedback matrix transmission at sub-7 GHz frequency band before switching to 60 GHz band. This preliminary beamforming operation at lower frequency establishes the initial beam configuration, which is then reused at 60 GHz, avoiding the need for complete beam training from scratch and thereby reducing latency while maintaining high transmission rates
Solution Approach 2:
The sub-7 GHz frequency band serves as an intermediary medium for beamforming configuration. The beamforming feedback matrix obtained at sub-7 GHz acts as a mediator that carries beam configuration information to the 60 GHz band, enabling efficient beamforming setup without direct complex training at 60 GHz
2Productivity
If beamforming operations are performed at 60 GHz frequency band, then transmission rate and bandwidth are improved, but overhead increases due to complex beam training procedures
Solution Approach 1:
The beamforming feedback matrix is preliminarily established at sub-7 GHz frequency band before 60 GHz operation. This preliminary configuration reduces the amount of beam training overhead required at 60 GHz, as the system can reuse the previously established beamforming parameters rather than performing complete beam training
Solution Approach 2:
The sub-7 GHz band acts as an intermediary that provides beamforming configuration information to the 60 GHz band. By using the beamforming feedback matrix from sub-7 GHz as a mediator, the system reduces the overhead of beam training at 60 GHz while maintaining high transmission performance
Data Source
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AI summary
A method and device for operating in a wireless LAN system are disclosed. A method performed by a first station (STA) in a wireless LAN system according to one embodiment of the present disclosure may include transmitting a beamforming feedback matrix to a second STA within a first band; receiving beamforming-related information including first information related to a specific beam from the second STA; and performing communication with the second STA based on the beamforming-related information within a second band, and the first information may be configured based on the beamforming feedback matrix, and wherein the information related to beamforming may include second information related to antenna settings of the first band.