Access Point Probe Response Coordination via Central Management Server
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Solution Overview
Problem
In densely populated areas or large events, the large number of access points in wireless networks leads to a high volume of probe request and response frames, reducing bandwidth availability due to the need for multiple devices to transmit on different channels, causing interference and limiting data traffic capacity.
Innovation Solution
A method where access points forward probe requests and signal strength metrics to a management server, which ranks and selects the best access point for client connectivity, instructing only that access point to respond, thereby reducing management traffic and increasing bandwidth for data traffic.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If all access points respond to probe requests, then client devices can discover available networks, but management traffic increases and bandwidth for data traffic decreases
Solution Approach 1:
The patent introduces a central controller as an intermediary that receives probe requests from client devices and selectively forwards them to appropriate access points. This mediator coordinates the response process, ensuring that only the most suitable access point responds to each probe request, thereby reducing management traffic while maintaining network discovery functionality
Solution Approach 2:
Instead of having all access points respond to all probe requests (traditional approach), the patent inverts the logic by having a central controller determine which access points should respond. The system shifts from a distributed response model to a centralized coordination model, reducing unnecessary probe responses and freeing up bandwidth for data traffic
2Adaptability or versatility
If multiple access points respond to probe requests, then client devices have more connectivity options, but interference increases and network efficiency decreases
Solution Approach 1:
The patent implements a feedback mechanism where the central controller receives information about client device probe requests, evaluates the current network conditions and access point states, and makes intelligent decisions about which access points should respond. This feedback loop ensures that only access points with favorable conditions respond, minimizing interference while maintaining connectivity options
Solution Approach 2:
The patent applies local quality by allowing different access points to have different response behaviors based on their local conditions. The central controller evaluates each access point's current state, signal strength, and load conditions to determine which ones should respond to probe requests, ensuring that responses come from access points with the most favorable local characteristics
3Area of stationary object
If access points respond to all probe requests, then network coverage is maximized, but the number of probe response frames increases bandwidth consumption
Solution Approach 1:
The patent applies preliminary action by having the central controller pre-evaluate probe requests and determine the most suitable access points before actual connection attempts. By making these decisions in advance, the system avoids unnecessary probe responses from unsuitable access points, reducing management traffic volume while ensuring that clients are directed to appropriate access points for maintaining comprehensive coverage
Data Source
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AI summary
In a wireless network such as Wi-Fi, a wireless access point connected to a client device monitors the quality of the link to the client device. When the client device sends probe frames indicative of the link to the connected access point being too low for continued data connectivity, the access points forwards connection data to a management server. When other access points receive the probe requests, they consult the management server to obtain the low channel quality data and use it as a threshold for determining whether to respond to the client device's probe request.