Cooperative Wi-Fi Spatial Stream Allocation for Cross-BSS Interference
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Solution Overview
Problem
In wireless communication systems with increased Wi-Fi deployment density, bidirectional cross interference occurs between adjacent basic service sets (BSSs), making parallel data transmission difficult across different BSSs, and existing channel state information management is inefficient due to frequent re-obtaining of channel information.
Innovation Solution
A data transmission method and apparatus that enables cooperation between two adjacent access points (APs) to allocate spatial streams to associated stations (STAs) in a manner that respects the spatial stream limits of both APs, allowing parallel uplink and downlink data transmission without time division, ensuring accurate scheduling and reducing acknowledgement overheads.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If beamforming cooperation is used between two adjacent APs to implement parallel data transmission, then system efficiency is improved, but overheads of obtaining channel information are relatively large due to frequent re-obtaining
Solution Approach 1:
The patent applies preliminary action by having APs pre-obtain and store channel state information (CSI) for multiple STAs before actual data transmission occurs. The APs establish and maintain a cache of CSI including signal strength, angle of arrival, and other channel characteristics in advance, so that when parallel data transmission is needed, the pre-stored CSI can be immediately utilized without requiring fresh channel measurements, thus reducing the time overhead while maintaining transmission efficiency
2Measurement precision
If channel state information is re-obtained after time validity period, then transmission accuracy is maintained, but overheads of obtaining channel information are relatively large
Solution Approach 1:
The patent implements dynamics by introducing a time validity mechanism for channel state information with adaptive refresh strategies. The system dynamically determines when CSI should be updated based on factors such as channel stability, traffic patterns, and interference conditions. The APs monitor the age and validity of stored CSI and selectively refresh only when necessary, rather than periodically re-obtaining all CSI, thus maintaining measurement precision while reducing time overhead through dynamic adaptation
3Productivity
If multiple STAs transmit data in parallel in different BSSs, then data transmission capacity is improved, but bidirectional cross interference occurs between adjacent BSSs
Solution Approach 1:
The patent applies feedback by implementing an interference detection and coordination mechanism between adjacent APs. The APs continuously monitor for cross-BSS interference through feedback signals from STAs and adjust their transmission parameters accordingly. When parallel transmissions are scheduled, the APs exchange interference information and coordinate resource allocation to minimize harmful interference, enabling multiple STAs to transmit in parallel while actively managing and reducing cross-BSS interference through continuous feedback loops
Data Source
AI summary
A data transmission method and apparatus applied to the wireless communications field, where the method includes receiving, by a first access point (AP), cooperation configuration information from a second AP, where the cooperation configuration information of the second AP indicates basic cooperation information of the second AP to the first AP, and triggering, by the first AP based on a quantity of spatial streams allocated through cooperation, at least one cooperation station (STA) associated with the first AP to perform uplink data transmission using a quantity of spatial streams allocated by the first AP.