Coordinated Beamforming in Overlapped WLAN Transmissions
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Solution Overview
Problem
Coordinated beamforming in WLAN contexts faces challenges with residual interference due to legacy constraints and transmission packet formats, leading to high error rates and inefficiencies.
Innovation Solution
The implementation of communication devices that transmit configuration information including beamforming settings and time information, allowing for coordinated beamforming that minimizes interference by applying beamforming weights to both preambles and payloads of data units.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If coordinated beamforming is implemented in WLAN context, then spectral efficiency is improved, but residual interference increases due to legacy constraints and transmission packet formats
Solution Approach 1:
The patent applies preliminary action by performing beamforming training and configuration exchange between access points before actual data transmission. The first access point transmits beamforming configuration information and time information indicating the duration of intended transmission, allowing the second access point to prepare appropriate beamforming weights in advance to minimize interference towards the first access point's clients.
Solution Approach 2:
The patent applies parameter changes by dynamically adjusting beamforming weights based on transmission duration and configuration information exchanged between access points. The beamforming weights are optimized to reduce interference while maintaining spectral efficiency, with parameters such as weight magnitude and phase being modified according to the coordinated transmission schedule.
2Object-affected harmful factors
If beamforming weights are applied to both preambles and payloads, then interference minimization is improved, but device complexity increases
Solution Approach 1:
The patent applies segmentation by separately handling beamforming for preambles and payloads. The beamforming configuration information is transmitted in distinct protocol elements, with preamble beamforming weights determined from training sequences and payload beamforming weights derived from the configuration information. This segmented approach allows independent optimization of interference reduction for different packet portions while managing computational complexity.
Data Source
AI summary
Two access points AP1 and oAP1 are within overlapping basic service sets and engage in partially or fully overlapped downlink transmissions towards respective associated station(s) STA1, oSTA1. At the same time the interference towards the other stations involved in the coordinated communication scheme is controlled and suppressed/reduced.