Logical AP Key Sharing for Multi-Link Wi-Fi Roaming

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Solution Overview

Problem

The challenge in the IEEE 802.11be standard is how to manage and share a communication key among a plurality of physically different access points that logically function as one access point to enhance mobility and connectivity.

Innovation Solution

A mechanism is introduced to share an encryption key among physically different access points functioning as one logical access point, allowing them to coordinate and manage connections with a station device through a generation and sharing unit.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Adaptability or versatility

If multiple physically different access points are coordinated to function as one logical AP MLD, then mobility and connectivity are improved, but key management complexity increases

Engineering Contradiction:

Improvemobility and connectivityVSAvoidkey management complexity

Core Design Contradiction:

Adaptability or versatilityVSDevice complexity

Solution Approach 1:

The patent merges the key management functions of multiple physically different access points into a single logical key management unit. The generation unit generates encryption keys and the sharing unit distributes them to all APs in the MLD, consolidating what would otherwise be separate key management operations across multiple devices into one coordinated system.

Inventive Principle:

Principle #5Merging (Combining)

Solution Approach 2:

The patent introduces a key management unit as an intermediary component that mediates between multiple access points. This unit handles the generation and distribution of encryption keys to all APs in the MLD, simplifying the key management process by centralizing the function rather than requiring each AP to manage its own keys independently.

Inventive Principle:

Principle #24Intermediary (Mediator)

2Productivity

If multiple links are established across different frequency channels, then communication throughput is improved, but key sharing requirements increase

Engineering Contradiction:

Improvecommunication throughputVSAvoidkey sharing requirements

Core Design Contradiction:

ProductivityVSDevice complexity

Solution Approach 1:

The patent implements a universal key management mechanism that serves all links within the MLD. The generation unit creates encryption keys that are universally applicable across multiple frequency channels and links, and the sharing unit distributes these universal keys to all APs, eliminating the need for separate key management for each link.

Inventive Principle:

Principle #6Universality (Multi-functionality)

3Ease of operation

If physically different access points share one logical upper MAC layer, then ease of operation is improved, but information sharing complexity increases

Engineering Contradiction:

Improveease of connectionVSAvoidinformation sharing complexity

Core Design Contradiction:

Ease of operationVSLoss of information

Solution Approach 1:

The patent implements a self-service key management mechanism where the generation unit automatically generates encryption keys and the sharing unit automatically distributes them to all APs in the MLD without requiring manual intervention. This automation simplifies the ease of operation while the systematic approach to information sharing prevents loss or confusion.

Inventive Principle:

Principle #25Self-service

Data Source

PatentUS20260006666A1Access point device, control method, and storage medium

Publication Date: 2026.01.01 CANON KK

AI summary

An access point device that performs communication with a station device establishes a link for performing communication with a station, generates an encryption key for encrypting the communication with the station device, and shares information about the encryption key with another access point device.