Coordinated Beamforming Signaling for Cross-BSS Interference Mitigation
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Solution Overview
Problem
Existing wireless communication systems face challenges in managing increasing bandwidth requirements and interference in networks with multiple access points and user stations, particularly in dense deployment environments, where BSSs often operate on the same frequency channel, leading to interference and inefficient spectrum utilization.
Innovation Solution
Implement coordinated beamforming (CoBF) techniques that involve cross-BSS sounding and CSI feedback mechanisms to optimize interference mitigation and spectral efficiency by coordinating transmissions among multiple APs and STAs, using joint NDPs and CSI processing to form nulls and beams, and employing BSS coloring to enhance spatial reuse and reduce contention.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of stationary object
If multiple BSSs operate on the same frequency channel to increase network coverage and connectivity, then network coverage and accessibility are improved, but interference between BSSs increases and spectral efficiency deteriorates
Solution Approach 1:
The patent segments the frequency spectrum into multiple channels and assigns different channels to different BSSs operating in the same geographic area. This channel segmentation allows multiple BSSs to coexist without interfering with each other, thus maintaining network coverage while eliminating interference.
Solution Approach 2:
The patent implements local quality by allowing different BSSs to use different frequency channels based on their local deployment requirements. Each BSS can be configured with optimal channel assignments based on local interference conditions, enabling coverage expansion while maintaining spectral efficiency in each local area.
2Productivity
If BSSs use the same frequency channel to improve spectrum utilization, then spectral efficiency is improved, but interference increases and medium access contention worsens
Solution Approach 1:
The patent introduces a new dimension for resource allocation by using spatial-temporal coordination in addition to frequency channel assignment. BSSs can share frequency channels at different times or spatial locations, effectively adding temporal and spatial dimensions to the resource allocation problem. This allows spectral efficiency improvement while managing interference through coordinated access patterns.
Solution Approach 2:
The patent implements feedback mechanisms where BSSs monitor interference levels and medium access conditions, then adjust their channel assignments and transmission parameters accordingly. This feedback-driven adaptation enables the system to maintain high spectral efficiency while dynamically responding to interference and contention conditions.
3Object-generated harmful factors
If coordinated beamforming is implemented to mitigate interference, then interference mitigation and spectral efficiency are improved, but system complexity and processing requirements increase
Solution Approach 1:
The patent applies preliminary action by pre-configuring beamforming parameters and coordination protocols between BSSs before actual data transmission. Channel state information is collected and processed in advance, and beamforming weights are pre-calculated based on predicted interference conditions. This preliminary preparation reduces real-time processing complexity while maintaining effective interference mitigation.
Solution Approach 2:
The patent introduces an intermediary coordination mechanism that manages beamforming parameters and resource allocations between multiple BSSs. This intermediary layer handles the complex coordination tasks, allowing individual BSSs to implement beamforming with reduced computational burden while still achieving coordinated interference mitigation across the network.
Data Source
AI summary
Certain aspects of the present disclosure provide a method for wireless communication utilizing coordinated communication, such as coordinated beamforming (CoBF). According to certain aspects, an apparatus (e.g., an AP or non-AP STA) obtains a first frame that includes a preamble, said preamble having: at least one common portion applicable to a first basic service set (BSS) and a second BSS, wherein the first wireless node is associated with the first BSS, one or more user-specific portions, an indication that the first frame is part of a coordinated communication scheme involving the first BSS and the second BSS, and information that identifies the first BSS and the second BSS; and processes the one or more user-specific portions, based on the indication and the information.