Multi-AP Channel State Information Coordination
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Solution Overview
Problem
Wireless local area networks (WLANs) face challenges in efficiently managing resources to provide bandwidth and response times due to multiple devices sharing resources, with limitations from communication protocols and hardware bandwidth, especially when operating with both newer and legacy protocols.
Innovation Solution
The proposed solution involves a radio architecture that includes a front-end module, radio IC circuitry, and baseband processing circuitry, enabling efficient scheduling of location measurement reports, traffic indication maps, and other information during beacon intervals, which may be based on Time-Waiting Techniques (TWTs), and extends traffic indication maps (TIMs) to support coexistence of WLAN and Bluetooth functionalities.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If multiple devices share the same wireless resources in a WLAN, then network coverage and device connectivity are improved, but resource contention and communication efficiency deteriorate
Solution Approach 1:
The patent segments the wireless medium access by implementing separate contentions for BSS (Basic Service Set) and OBSS (Overlapping Basic Service Set) packets. This is achieved through distinct CTS (Clear to Send) and CF-Ack (Contention-Free Acknowledgment) transmission mechanisms for different packet types, allowing simultaneous or sequential access without mutual interference. The segmentation resolves the contradiction by enabling multiple devices to maintain connectivity while reducing resource contention through organized access categories.
2Productivity
If newer communication protocols are implemented to improve bandwidth and response times, then communication performance is improved, but compatibility with legacy devices deteriorates
Solution Approach 1:
The patent implements a universal communication framework where a single WLAN system supports both legacy and newer communication protocols simultaneously. The access point can handle traditional contention-based protocols while also implementing the newer CTS/CF-Ack mechanisms for improved bandwidth. This multi-functionality allows legacy devices to operate with traditional protocols while newer devices benefit from enhanced performance, resolving the contradiction between performance improvement and compatibility maintenance.
3Speed
If resource allocation is optimized for specific devices to improve response times, then communication speed is improved, but overall network fairness deteriorates
Solution Approach 1:
The patent applies local quality optimization by providing differentiated resource allocation based on device needs and traffic types. High-priority traffic and time-sensitive applications receive preferential treatment through dedicated contention opportunities and prioritized CTS/CF-Ack transmissions, while maintaining standard access for general traffic. This localized optimization improves response times for critical applications without completely sacrificing overall network fairness, as each device category receives appropriate service quality.
Data Source
AI summary
Methods, apparatuses, and computer readable media for channel state information for multiple access points are disclosed. Channel station information (CSI) may be coordinated for multiple access points (APs) where one AP may act as a master AP with other AP acting as slave APs. The channel station information may be based on information from null data packets received by stations from multiple-APs, which may enable a multi-AP coordinated beamforming (CBF) to be determined based on the received first CSI reports. New frame formats are disclosed that include fields for including APs. Overlapping basic service set (OBSS) stations may respond to APs that are not within their BSS. Some embodiments relate to passive range finding in a multi-AP sounding where location configuration information (LCI) changes for one of the APs.