Access Point Probe Filtering for WPA2/WPA3 Security Selection

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Solution Overview

Problem

Legacy devices are unable to connect to an access point when WPA3-TM is implemented, while newer devices with WPA3 security capabilities face seamless connection issues with legacy devices.

Innovation Solution

An access point guides client devices to associate with the strongest security protocol supported by the device, ignoring WPA3-capable devices' WPA2 probe requests to enforce WPA3 connection, allowing legacy devices to connect via WPA2.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Adaptability or versatility

If WPA3-TM security protocol is implemented to allow both legacy and newer devices to connect, then device compatibility is improved, but connection reliability deteriorates as legacy devices are unable to connect

Engineering Contradiction:

Improvedevice compatibilityVSAvoidconnection reliability

Core Design Contradiction:

Adaptability or versatilityVSReliability

Solution Approach 1:

The access point applies different security protocol handling based on the client device type: WPA3 probe requests from WPA3-capable devices are processed normally to enable secure connections, while WPA2 probe requests from legacy devices are ignored to prevent incompatible connections. This local differentiation resolves the contradiction by ensuring only compatible devices attempt connection.

Inventive Principle:

Principle #3Local quality

Solution Approach 2:

Instead of accepting both WPA2 and WPA3 probe requests as in traditional WPA3-TM, the access point inverts the approach by selectively rejecting WPA2 probe requests from WPA3-capable devices and only accepting WPA3 probe requests. This inversion ensures that only devices capable of WPA3 actually connect, eliminating the compatibility issue while maintaining security.

Inventive Principle:

Principle #13The other way round (Inversion)

2Reliability

If WPA3 security protocol is enforced on the access point, then security strength is improved, but device connectivity worsens for legacy devices

Engineering Contradiction:

Improvesecurity strengthVSAvoiddevice connectivity

Core Design Contradiction:

ReliabilityVSAdaptability or versatility

Solution Approach 1:

The access point implements selective probe request handling based on device capabilities: WPA3-capable devices receive normal service announcements and can connect securely via WPA3, while legacy devices are implicitly excluded from WPA3 connections. This local quality differentiation maintains high security for supported devices while preserving connectivity for legacy devices through WPA2.

Inventive Principle:

Principle #3Local quality

3Reliability

If the access point ignores WPA2 probe requests from WPA3-capable devices, then security optimization is improved, but connection complexity increases

Engineering Contradiction:

Improvesecurity optimizationVSAvoidconnection complexity

Core Design Contradiction:

ReliabilityVSDevice complexity

Solution Approach 1:

The access point automatically identifies WPA3-capable devices through their probe requests and applies appropriate handling without requiring manual configuration. The system self-determines which devices should use WPA3 and which should use WPA2, eliminating the need for complex manual device classification while maintaining security optimization.

Inventive Principle:

Principle #25Self-service

Data Source

PatentUS20250287205A1Optimizing security in wireless networks

Publication Date: 2025.09.11 CHARTER COMM OPERATING LLC

AI summary

In a wireless (e.g., Wi-Fi 7) network, an access point (AP) that supports multiple security protocols (e.g., WPA2 and WPA3) ignores probe requests for association and connection with the AP using WPA2 from clients that also support WPA3, while granting WPA2 probe requests from WPA2-only clients and WPA3 probe requests from WPA3-capable clients, thereby preventing WPA3-capable clients from connecting using the lower-security WPA2 protocol and guiding all clients to optimize the security of their connections with the AP.