Coordinated Spatial Reuse in Overlapping Basic Service Sets
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Solution Overview
Problem
Current spatial reuse schemes in wireless networks, such as those defined in IEEE 802.11be, face limitations in maximizing spectral utilization efficiency, particularly in overlapping basic service sets where interference from access points and stations can hinder network performance.
Innovation Solution
The implementation of coordinated spatial reuse techniques, including transmit power and frequency allocation methods, allows access points to collaborate and optimize their transmissions by considering interference from both stations and other access points, thereby improving throughput and spectral efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If coordinated spatial reuse techniques are implemented to improve spectral utilization efficiency, then network throughput and spectral efficiency are improved, but system complexity and coordination overhead between access points increase
Solution Approach 1:
Multiple access points are merged into a coordinated system where they function as a unified network entity. The patent implements joint transmission and reception across multiple APs, combining their capabilities to serve stations in overlapping basic service sets simultaneously, thereby improving spectral efficiency while managing complexity through centralized coordination protocols
Solution Approach 2:
A coordination mechanism acts as an intermediary between access points to manage interference and resource allocation. The patent introduces coordination messages and signaling protocols that enable APs to exchange information about their transmissions, power levels, and channel usage, allowing them to dynamically adjust parameters without direct complex peer-to-peer interaction
2Power
If access points transmit at higher power levels to improve coverage and throughput, then signal strength and data rates are improved, but interference to other basic service sets increases
Solution Approach 1:
The patent dynamically adjusts transmit power as a variable parameter based on real-time coordination information. Access points modify their power levels according to the interference conditions and resource allocation decisions made through the coordination mechanism, allowing optimal power usage that balances coverage requirements with interference mitigation to adjacent basic service sets
Solution Approach 2:
Transmit power levels are made dynamic rather than fixed. The coordination system enables access points to continuously adapt their power settings based on changing network conditions, station locations, and resource allocation patterns, allowing the system to optimize performance while minimizing harmful interference to overlapping networks
3Productivity
If multiple basic service sets operate simultaneously in overlapping areas to increase network capacity, then spatial reuse and throughput are improved, but interference management and collision avoidance become more difficult
Solution Approach 1:
The patent segments the wireless medium into distinct resource units that can be independently allocated to different basic service sets. By dividing the available spectrum and time resources into manageable segments, the coordination system can assign specific segments to specific APs, reducing interference while maintaining high network capacity through efficient resource utilization
Solution Approach 2:
A feedback mechanism is implemented where access points monitor interference levels and transmission success rates, then report this information to the coordination system. The coordination mechanism uses this feedback to adjust resource allocations and power settings, creating a closed-loop control system that continuously optimizes network performance while managing interference in dense deployments
Data Source
AI summary
Coordinated spatial reuse and frequency utilization techniques in overlapping basic service set environments for IEEE 802.11be and beyond. The techniques involve transmit power and frequency allocation methods designed for coordinated spatial reuse between multiple access points, considering interference from stations and access points, as well as occupied bandwidth. In one embodiment, an access point generates a trigger frame with punctured bandwidth or good subchannel information to coordinate spatial reuse, enabling a station to transmit an uplink data packet using specified parameters. In another embodiment, a station receives a trigger frame with punctured bandwidth information and transmits an uplink data packet excluding the puncture portion to avoid interference. The techniques allow transmissions in multiple basic service sets to coexist without harmful interference, improving throughput and frequency utilization in dense wireless networks. Although primarily described in the context of IEEE 802.11, the techniques can be applied to other wireless networks.