WLAN AP Selection Using Sub-SSIDs for Seamless Handoffs

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Solution Overview

Problem

In IEEE 802.11 networks, users cannot selectively choose the most suitable access point (AP) for connection due to shared SSIDs, leading to suboptimal wireless communication performance when signal strength of the primary AP exceeds a certain threshold.

Innovation Solution

Implementing sub-SSIDs for each AP in a wireless network, allowing devices to automatically switch to a more suitable AP based on parameters like signal strength or distance without requiring user input, using a common network key for authentication.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Adaptability or versatility

If a common SSID is used for multiple base stations, then network coverage is extended and user mobility is supported, but users cannot selectively choose the most suitable AP for connection

Engineering Contradiction:

Improvenetwork coverageVSAvoidAP selection capability

Core Design Contradiction:

Adaptability or versatilityVSEase of operation

Solution Approach 1:

The patent segments the common SSID into a base SSID and multiple sub-SSIDs, where each sub-SSID corresponds to a specific base station. This segmentation allows devices to distinguish between different APs while maintaining the overall network identity, thereby enabling selective AP choice without compromising network coverage.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The patent applies local quality by making each base station's sub-SSID have unique local characteristics (identifying the specific AP) while sharing the common base SSID. This allows devices to select based on local conditions (signal strength, distance) while maintaining consistent network access.

Inventive Principle:

Principle #3Local quality

2Productivity

If devices automatically switch between APs based on signal strength, then wireless communication performance is optimized, but connection switching complexity increases

Engineering Contradiction:

Improvecommunication performanceVSAvoidconnection switching mechanism

Core Design Contradiction:

ProductivityVSDevice complexity

Solution Approach 1:

The patent implements preliminary action by pre-configuring sub-SSIDs for each base station before connection occurs. Devices can automatically select and switch between APs using these pre-defined sub-SSIDs without requiring complex real-time decision algorithms, thereby optimizing performance while keeping the switching mechanism relatively simple.

Inventive Principle:

Principle #10Preliminary action

3Ease of operation

If sub-SSIDs are implemented for each AP, then AP selection and switching capability is improved, but configuration complexity of the network increases

Engineering Contradiction:

ImproveAP selection capabilityVSAvoidnetwork configuration

Core Design Contradiction:

Ease of operationVSDevice complexity

Solution Approach 1:

The patent applies universality by designing sub-SSIDs that serve multiple functions: they identify specific base stations, enable automatic AP selection, and maintain compatibility with existing SSID-based network access. This multi-functionality reduces the need for separate configuration mechanisms for different features.

Inventive Principle:

Principle #6Universality (Multi-functionality)

Data Source

PatentUS20260025743A1Wireless Communication Device and Base Station Involved in SSID Rename Tagging

Publication Date: 2026.01.22 VESTEL ELEKTRONIK SANAYI & TICARET ANONIM SIRKETI

AI summary

Methods and techniques are disclosed for selection of a base station in a wireless local area network for connection by a wireless communication device. In addition to a WLAN's SSID (service set identifier), sub-SSIDs are provided each identifying a respective one of the plurality of base stations. By using sub-SSIDs. switching connections from a first base station to a second base station which is more suitable in terms of network performance is facilitated. Moreover, authentication is facilitated by the plurality of base stations sharing a common SSID while being distinguished by the sub-SSIDs.