Base Station Channel Assignment Using Dithered Data Rates

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Solution Overview

Problem

Current 802.11 WLAN standards face issues with high overhead, low throughput, and lack of quality of service (QoS) due to the simplicity and robustness of CSMA/CA medium access, which limits channel efficiency and prevents opportunistic use of high-rate hosts to improve overall channel throughput.

Innovation Solution

A base station system that calculates data rates from transmitted signals, applies dithering noise, and uses channel assignment logic to manage access channels, allowing for optimized channel allocation based on dithered signals, thereby enhancing channel efficiency and supporting quality of service.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Ease of operation

If CSMA/CA medium access control is used in 802.11 WLANs, then the system achieves simple and robust operation, but the channel efficiency is low and throughput is reduced

Engineering Contradiction:

Improvesimplicity of medium access controlVSAvoidchannel throughput

Core Design Contradiction:

Ease of operationVSProductivity

Solution Approach 1:

The patent implements dynamic channel assignment where access channels are dynamically allocated to mobile stations based on their data rates and channel conditions. The base station continuously monitors transmitted signals and adjusts channel assignments to optimize throughput while maintaining operational simplicity through automated decision-making.

Inventive Principle:

Principle #15Dynamics

Solution Approach 2:

The patent changes the parameter of channel assignment from static to dynamic based on data rate calculations. By calculating data rates from transmitted signals and using dithered signals for channel assignment, the system adapts channel allocation to current network conditions, improving throughput without complicating the overall operation.

Inventive Principle:

Principle #35Parameter changes

2Reliability

If simple CSMA/CA is used for medium access, then the system maintains robustness, but quality of service (QoS) is not supported

Engineering Contradiction:

Improverobustness of medium access controlVSAvoidquality of service capability

Core Design Contradiction:

ReliabilityVSAdaptability or versatility

Solution Approach 1:

The patent applies local quality by differentiating service based on individual mobile station characteristics. Each mobile station receives channel assignment tailored to its specific data rate and channel conditions, enabling QoS support while maintaining the robustness of CSMA/CA through localized optimization rather than fundamental protocol changes.

Inventive Principle:

Principle #3Local quality

Solution Approach 2:

The base station calculates data rates from transmitted signals and uses this feedback information for channel assignment decisions. This feedback mechanism enables the system to adapt to varying QoS requirements while preserving the robustness of the underlying CSMA/CA protocol through automated, data-driven channel management.

Inventive Principle:

Principle #23Feedback

3Productivity

If 802.11e Block Ack technique is used to improve channel efficiency, then QoS is supported, but the mechanism becomes quite complex

Engineering Contradiction:

Improvechannel efficiencyVSAvoidcomplexity of medium access control

Core Design Contradiction:

ProductivityVSDevice complexity

Solution Approach 1:

The patent extracts the essential function of channel efficiency improvement from the complex 802.11e Block Ack mechanism. By directly calculating data rates from transmitted signals and using dithered signals for channel assignment, the system achieves channel efficiency without the setup and tear-down procedure complexity of explicit Block Ack.

Inventive Principle:

Principle #2Taking out (Extraction)

Solution Approach 2:

The patent creates a simplified version of advanced channel management by copying the functional outcome (improved channel efficiency) without the complex implementation. The base station replicates the effectiveness of Block Ack through direct data rate calculation and dithered signal-based channel assignment, avoiding the procedural complexity.

Inventive Principle:

Principle #26Copying

4Measurement precision

If dithering noise is applied to data rate signals, then channel assignment precision is improved, but signal processing complexity increases

Engineering Contradiction:

Improveprecision of data rate measurementVSAvoidcomplexity of signal processing

Core Design Contradiction:

Measurement precisionVSDevice complexity

Solution Approach 1:

The patent converts the potentially harmful effect of noise into a beneficial dithering mechanism. By applying controlled dithering noise to data rate signals, the system improves measurement precision and channel assignment accuracy. The noise, rather than degrading signal quality, enables more precise differentiation of data rates and optimal channel selection.

Inventive Principle:

Principle #22Blessing in disguise (Convert harm into benefit)

Data Source

PatentUS8254996B2Systems and methods for managing access channels

Publication Date: 2012.08.28 HEWLETT PACKARD ENTERPRISE DEV LP

AI summary

Systems and methods for maintaining base stations are provided. In this regard, a representative system, among others, includes a base station that is configured to receive transmitted signals from one or more mobile stations, calculate one or more data rates based on the transmitted signal associated with the one or more mobile stations, respectively, and generate data rate signals based on the calculated one or more data rates. The base station includes a dithering unit that is configured to apply dithering noise to the data rate signals, and memory that includes channel assignment logic configured to assign access channels to the one or more mobile stations based on the dithered signals, respectively.