Beamforming Transmission Sharing with Null Steering Between Networks
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Solution Overview
Problem
Existing wireless networks face challenges in improving spectral efficiency and reducing interference between neighboring networks due to the lack of effective channel state information sharing and beamforming techniques, particularly in scenarios where stations are unassociated with access nodes.
Innovation Solution
Implementing inter-network beamforming cooperation through the use of null steering, where access nodes share transmission opportunities by directing transmission nulls towards unassociated stations, and stations provide channel state information during an additional period to update beamforming configurations, thereby reducing interference and enabling concurrent transmissions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If beamforming is implemented to focus radio energy towards intended recipients, then link quality and spatial reuse are improved, but interference management complexity increases due to lack of channel state information sharing between networks
Solution Approach 1:
The patent merges channel state information acquisition from both associated and unassociated stations into a unified process. The access node transmits a single trigger frame that initiates CSI feedback from multiple stations, combining what would otherwise be separate information gathering operations into one coordinated action, thereby reducing management complexity while maintaining beamforming performance
Solution Approach 2:
The trigger frame acts as an intermediary mechanism that coordinates CSI feedback collection from multiple stations. Instead of managing complex individual interactions between access nodes and stations, the trigger frame mediates the information exchange process, simplifying the coordination required for inter-network beamforming cooperation
2Productivity
If transmission opportunities are shared between access nodes for concurrent transmissions, then spectral efficiency is enhanced, but interference between networks increases without proper null steering
Solution Approach 1:
The patent applies preliminary action by acquiring channel state information from unassociated stations before allowing concurrent transmissions to proceed. The access node collects CSI feedback in advance through the trigger frame mechanism, then uses this information to configure null steering that prevents interference while enabling spectral efficiency gains from shared transmission opportunities
Solution Approach 2:
The patent converts the potentially harmful interference from concurrent transmissions into a beneficial outcome by using the CSI feedback from unassociated stations to configure null steering. The interference problem is transformed into an opportunity to refine beamforming configurations, where the presence of multiple transmitting nodes enables more accurate interference management through coordinated null steering
3Measurement precision
If channel state information is collected from unassociated stations during an additional period, then beamforming configuration accuracy is improved, but transmission time overhead increases
Solution Approach 1:
The patent merges the CSI feedback collection for unassociated stations with the existing trigger frame mechanism used for associated stations. By combining these information gathering operations into a single trigger frame transmission and feedback collection process, the patent reduces the additional time overhead that would result from separate information gathering procedures, while still achieving improved beamforming configuration accuracy
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This approach enhances spectral efficiency by allowing concurrent data transmissions with reduced interference, improving link quality and spatial reuse in wireless networks.
Implementation Method 1
Beamforming is a technique where a transmitter focuses radio energy towards an intended recipient and/or reduces radio energy towards an unintended recipient
Implementation Method 2
The benefit may be improved link quality and/or reduced interference towards other radio receivers, as well as an improved spatial reuse
Data Source
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Figure 4B
AI summary
This document discloses a solution for sharing a transmission opportunity in a wireless network. According to an aspect, a method for an apparatus of a first wireless network comprises: determining a plurality of devices of a second wireless network for null steering; transmitting a trigger frame, the trigger frame indicating a transmission period for data frame transfer between the apparatus and another apparatus of the first wireless network, a spatial reuse opportunity for the second wireless network during the transmission period, and an additional period preceding the transmission period; receiving, from at least one device of the second wireless network during the additional period, a channel state frame; and performing, based on the channel state frame, null steering towards the at least one device during the transmission period.