Multi-AP WiFi Sounding With Staggered Triggers and Lower Airtime
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Solution Overview
Problem
Sounding in modern WiFi systems, particularly in multiple AP configurations, is inefficient and time-consuming, hampering network efficiency due to the use of null data packets (NDPs) for beamforming across many combinations of wireless access points (APs) and stations (STAs).
Innovation Solution
Implementing staggered sounding techniques, including a coordinator AP to schedule sounding across multiple APs, broadcast sounding triggers, and multicast transmissions, along with using association identifiers to trigger sounding for STAs outside the AP's BSS, and transmitting sounding matrix data as frame padding to reduce network traffic.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If traditional NDP-based sounding is used for beamforming across multiple APs and STAs, then beamforming capability is achieved, but airtime consumption increases significantly
Solution Approach 1:
The patent segments the sounding process by introducing a coordinator AP that manages and coordinates sounding operations across multiple APs. Instead of each AP independently performing sounding with STAs, the coordinator AP orchestrates the process, dividing the airtime into structured phases (sounding phase, feedback phase, beamforming phase) to reduce overall airtime consumption while maintaining beamforming capability across the multi-AP network.
2Measurement precision
If sounding is performed frequently to maintain beamforming accuracy, then beamforming precision is improved, but network efficiency deteriorates due to repeated airtime consumption
Solution Approach 1:
The patent implements periodic sounding operations coordinated by the coordinator AP, where sounding is performed at scheduled intervals rather than continuously or frequently by each AP independently. This periodic approach maintains beamforming accuracy through regular updates while improving network efficiency by consolidating sounding operations into structured time phases, reducing the overhead impact on overall network productivity.
3Adaptability or versatility
If multiple APs perform independent sounding with multiple STAs, then comprehensive coverage is achieved, but overhead and complexity increase
Solution Approach 1:
The patent introduces a coordinator AP as an intermediary that manages sounding operations across multiple APs and STAs. This coordinator acts as a central controller that receives sounding requests, schedules sounding operations, collects feedback, and coordinates beamforming decisions. This intermediary approach maintains comprehensive coverage capability across the network while reducing overall system complexity by centralizing coordination logic, preventing the exponential complexity that would arise from independent multi-AP multi-STA sounding.
Data Source
AI summary
Techniques for sounding for wireless communication include initiating staggered sounding between a plurality of wireless access points (APs) and a plurality of wireless stations (STAs), including transmitting, from each AP of the plurality of APs, a sounding trigger to a respective one or more of the plurality of STAs, where the sounding triggers are transmitted by the respective APs at staggered times. The techniques further include receiving sounding matrix data at the plurality of APs from the plurality of STA. The techniques further include modifying wireless transmission between at least one of the APs and at least one of the STAs based on the sounding matrix data.