Multi-AP Coordinated Beamforming Steering Matrix Calculation
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Solution Overview
Problem
In multi-AP coordinated transmission systems, calculating a steering matrix for coordinated beamforming (C-BF) that effectively suppresses interference is challenging, especially when not all participating APs or STAs contribute to the channel sounding results, leading to performance loss.
Innovation Solution
A method where a first access point (AP) transmits information indicating participation of APs and STAs in the C-BF mode within a multi-AP coordinated set, allowing the calculation of a steering matrix based on target channel state information, focusing on active participants to optimize signal transmission and interference suppression.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If channel sounding results from all participating APs and STAs are used to calculate the steering matrix, then the calculation complexity increases, but the interference suppression performance deteriorates when not all participants contribute
Solution Approach 1:
The patent extracts only the channel state information from active participants (those actually transmitting or receiving data) to form the steering matrix, excluding information from inactive participants. This is achieved by determining participation status of each AP and STA, then selectively using their channel state information, thereby reducing calculation complexity while maintaining interference suppression performance.
Solution Approach 2:
The patent applies local quality by differentiating between active and inactive participants, assigning different weights or inclusion statuses to their channel state information. Instead of uniformly processing all participants, the system locally adapts the calculation by including only those with actual transmission/reception activity, optimizing the steering matrix for current operational conditions.
2Power
If channel state information from inactive participants is included in steering matrix calculation, then more data is available for calculation, but the SINR and throughput performance deteriorate
Solution Approach 1:
The patent applies partial action by using only the necessary subset of channel state information from active participants rather than all available participants. This selective approach avoids the excessive inclusion of irrelevant or misleading data from inactive participants, thereby maintaining high SINR and throughput performance while using sufficient information for accurate steering matrix calculation.
3Reliability
If participation indication information is transmitted for all APs and STAs, then complete system state is recorded, but the overhead and communication latency increase
Solution Approach 1:
The patent extracts and transmits only the participation indication information for active participants rather than all participants in the coordinated set. By identifying and filtering out inactive participants, the system reduces the amount of indication information that needs to be exchanged, thereby lowering overhead and communication latency while maintaining accurate system state representation for the active subset.
Data Source
AI summary
A method of wireless communication includes: transmitting, by a first access point (AP), first information to at least one second AP, where the first information is used to indicate participation of an AP of a multi-AP coordinated set in a multi-AP coordinated transmission in a coordinated beamforming (C-BF) mode and/or participation of a station (STA) associated with an AP of the multi-AP coordinated set in the multi-AP coordinated transmission in the C-BF mode, and the first AP and the at least one second AP belong to the multi-AP coordinated set.