Wireless Station Band Preference Scanning Mechanism

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Solution Overview

Problem

Wireless stations (STAs) often fail to switch to a more favorable RF band, such as the 5 GHz band, even when it offers better connection capabilities, due to existing mechanisms that stop scanning for additional bands once the signal strength of the current band reaches a roaming threshold, resulting in suboptimal service.

Innovation Solution

Implementing a mechanism in STAs to dynamically scan for and connect to a preferred RF band, such as the 5 GHz band, when the signal strength of the current band (e.g., 2.4 GHz) exceeds a roaming threshold, allowing multiple scans while the signal strength remains above this threshold, and switching if the preferred band provides better throughput.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Use of energy by moving object

If the STA stops scanning for other RF bands when the signal strength reaches the roaming threshold, then power consumption is reduced, but the STA cannot switch to a more favorable RF band (e.g., 5 GHz) that may be available

Engineering Contradiction:

Improvepower consumptionVSAvoidability to switch to favorable RF band

Core Design Contradiction:

Use of energy by moving objectVSAdaptability or versatility

Solution Approach 1:

The patent implements dynamic scanning behavior where the STA continuously scans for preferred RF bands only when specific conditions are met (signal strength above threshold and trigger condition satisfied), rather than scanning continuously or never. This dynamic approach balances power consumption with the ability to switch to favorable bands.

Inventive Principle:

Principle #15Dynamics

Solution Approach 2:

The patent introduces a trigger condition parameter (such as signal strength change threshold or time-based triggers) that controls when scanning should occur. By changing the scanning behavior based on these parameters, the system optimizes between power consumption and band switching capability.

Inventive Principle:

Principle #35Parameter changes

2Adaptability or versatility

If the STA continues to scan for preferred RF bands even when signal strength is above roaming threshold, then the ability to switch to better bands is improved, but power consumption increases

Engineering Contradiction:

Improveability to switch to favorable RF bandVSAvoidpower consumption

Core Design Contradiction:

Adaptability or versatilityVSUse of energy by moving object

Solution Approach 1:

The patent implements periodic scanning where the STA performs scans at specific intervals or under specific trigger conditions rather than continuously. This periodic approach reduces power consumption while still maintaining the ability to detect and switch to favorable RF bands when they become available.

Inventive Principle:

Principle #19Periodic action

Solution Approach 2:

The patent applies partial scanning action by only scanning for preferred bands when trigger conditions are met (e.g., signal strength changes by a certain amount or time-based triggers), rather than scanning all the time. This partial action reduces overall power consumption while still capturing opportunities to switch to better bands.

Inventive Principle:

Principle #16Partial or excessive action

3Measurement precision

If the STA performs multiple scans for preferred RF band while signal strength is above roaming threshold, then the detection accuracy of favorable bands is improved, but the complexity of the scanning mechanism increases

Engineering Contradiction:

Improvedetection accuracy of favorable bandVSAvoidscanning mechanism complexity

Core Design Contradiction:

Measurement precisionVSDevice complexity

Solution Approach 1:

The patent segments the scanning process into multiple individual scans rather than one comprehensive scan. Each scan can be triggered by specific conditions, allowing the system to perform multiple targeted scans for preferred bands without requiring a completely complex restructured scanning mechanism.

Inventive Principle:

Principle #1Segmentation

Data Source

PatentUS10912088B2Band preference in wireless networks

Publication Date: 2021.02.02 QUALCOMM INC

AI summary

Method, systems, and apparatuses are described for wireless communications. More particularly, a wireless station may connect to a wireless network using a first radio frequency (RF) band and detect a signal strength of the first RF band is greater than a roaming threshold. The wireless station may perform a plurality of scans for support by the wireless network of a second RF band in response to the detected signal strength. Each scan may occur when the signal strength of the first RF band is greater than the roaming threshold. The wireless station may selectively connect to the wireless network using the second RF band based at least in part on the scanning and a throughput supported by the wireless network over the second RF band. The first RF band may be a 2.4 GHz band and the second RF band may be a 5 GHz band.