Wi-Fi AP Beacon Air Time Association
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Solution Overview
Problem
In densely deployed wireless network environments, conventional AP association methods lead to channel congestion and inefficient resource utilization due to uneven distribution of station devices (STAs) across access points (APs).
Innovation Solution
Access points (APs) broadcast periodic beacon frames containing receive power values, air time, and data rates of associated STAs. Newly arrived STAs scan these broadcasts, estimate their required air time and data rates for each AP, and select an AP with the least remaining air time that can satisfy their throughput requirements.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If STAs use strongest signal first association scheme, then association process is simple and fast, but channel congestion occurs and resource utilization becomes inefficient
Solution Approach 1:
The patent changes the association parameter from signal strength (RSSI) to air time estimation. APs broadcast air time information in beacon frames, and STAs use this parameter to select APs, replacing the conventional RSSI-based selection with an air time-aware approach that prevents channel congestion and improves resource utilization efficiency
Solution Approach 2:
The patent implements a feedback mechanism where APs continuously broadcast air time information about associated STAs in periodic beacon frames. This feedback allows STAs to make informed association decisions based on real-time channel conditions, preventing them from selecting overloaded APs and thereby improving overall channel resource utilization
2Loss of time
If STAs associate with AP having strongest signal, then association decision is made quickly, but load distribution among APs becomes uneven
Solution Approach 1:
The patent applies preliminary action by having APs pre-broadcast air time information in beacon frames before STA association decisions are made. This advance disclosure of channel load status enables STAs to make balanced association decisions without delaying the association process, as the necessary information is already available when STAs perform their selection
3Area of stationary object
If more APs are deployed densely, then network coverage is improved, but channel congestion increases and performance degrades
Solution Approach 1:
The patent introduces dynamics by making the association process adaptive to real-time channel conditions. Instead of static RSSI-based selection, the system dynamically adjusts STA-AP associations based on broadcasted air time information, allowing the network to automatically balance load distribution even in dense deployments with many APs, thereby maintaining performance while expanding coverage
Data Source
AI summary
A method can include, by operation of an access point device (AP), between transmissions of a periodic beacon frame, communicating with each associated station devices (STAs), from communications with the STAs determining connection information for all associated STAs, and generating an information element (IE) that includes the connection information for all associated STAs. During a beacon transmission period, a beacon frame can be transmitted that includes a media access control (MAC) header, a frame body, and a frame check sequence. The frame body can include the IE. Corresponding devices and systems are also disclosed.