Coordinated Multi-User Transmissions for Dense WLAN Spectrum Sharing
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Solution Overview
Problem
As the density of IEEE 802.11 WLANs increases, it becomes difficult for access points to find idle sub-channels that can be aggregated to form wider frequency bandwidths, necessitating improved coordination among neighboring networks.
Innovation Solution
Access points coordinate the use of sub-channels through coordinated multi-user (MU) transmissions, where a master AP generates an announcement frame to allocate frequency resource units to slave APs, initiating synchronized transmissions across multiple WLANs.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If APs operate independently without coordination, then each AP can autonomously manage its channels, but the likelihood of finding idle sub-channels for aggregation decreases as WLAN density increases
Solution Approach 1:
The patent merges the channel selection decisions of multiple neighboring APs by establishing a coordinated resource allocation mechanism. APs form groups and share channel information, allowing them to collectively identify and aggregate idle sub-channels that would be unavailable to individual APs operating independently. This combining approach directly addresses the contradiction by pooling resources to overcome the scarcity of idle channels in dense WLAN environments.
2Adaptability or versatility
If APs coordinate channel usage amongst neighboring WLANs, then the likelihood of utilizing wider frequency bandwidths increases, but the system complexity and coordination overhead increase
Solution Approach 1:
The patent segments the WLAN environment into distinct AP groups, each managing its own coordinated resource allocation independently. This segmentation allows coordination to be implemented in a modular fashion, where each group handles its own complexity internally without requiring global coordination across all APs. The segmentation principle reduces overall system complexity by localizing the coordination burden to manageable segments while still achieving the benefit of coordinated spectrum access.
3Productivity
If APs implement coordinated MU transmissions with announcement frames, then network efficiency and data rates improve, but the communication protocol complexity increases
Solution Approach 1:
The patent implements preliminary action by having APs exchange announcement frames before actual data transmissions occur. These announcement frames convey resource allocation information, scheduled transmission times, and channel aggregation plans in advance. This preliminary coordination allows receiving APs to prepare their receivers and clients to be synchronized, enabling efficient coordinated MU transmissions without requiring complex real-time negotiation during actual data transfer. The preliminary action principle separates the complex coordination phase from the execution phase, improving overall network efficiency.
Data Source
Figure 1A
Figure 1B~1C
Figure 2
AI summary
A first access point (AP), which is associated with one or more first client stations, generates an announcement frame that announces a coordinated multi-user (MU) transmission involving multiple APs including the first AP and one or more second APs. Each of the second APs is associated with a respective one or more second client stations. The announcement frame is generated to indicate respective one or more frequency resource units (RUs) allocated to the one or more second APs for the coordinated MU transmission. The first AP transmits the announcement frame to the one or more second APs to initiate the coordinated MU transmission, and participates in the coordinated MU transmission while the one or more second APs also participate in the coordinated MU transmission.