Dynamic Spectrum Access Measurement Management

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Solution Overview

Problem

Dynamic spectrum access (DSA) wireless networks face challenges in managing restricted frequency channels to ensure licensed users have unfettered access while maintaining quality of service (QoS) for secondary users, requiring effective measurement and reporting methods to coordinate channel usage.

Innovation Solution

A method is introduced where an access point transmits measurement requests to wireless stations, which perform and report measurements, including bulk measurement requests and urgent reporting, to manage channel access and maintain QoS by detecting imminent occupation by incumbent devices.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Measurement precision

If measurement requests are transmitted to all wireless stations to monitor channel occupancy, then spectrum management accuracy is improved, but network overhead and communication load increase

Engineering Contradiction:

Improvespectrum management accuracyVSAvoidnetwork overhead

Core Design Contradiction:

Measurement precisionVSQuantity of substance

Solution Approach 1:

The patent segments the measurement responsibility by dividing wireless stations into different groups based on their location, channel usage patterns, and QoS requirements. Only specific stations within relevant groups are selected to perform measurements and send reports, rather than requiring all stations to participate. This segmentation reduces the number of measurement reports while maintaining comprehensive spectrum monitoring coverage.

Inventive Principle:

Principle #1Segmentation

2Speed

If frequent measurement reports are collected to detect imminent channel occupation, then response time to incumbent users is improved, but energy consumption and processing load increase

Engineering Contradiction:

Improveresponse timeVSAvoidenergy consumption

Core Design Contradiction:

SpeedVSUse of energy by moving object

Solution Approach 1:

The patent implements periodic measurement reporting where wireless stations send measurement reports at predetermined intervals rather than continuously. The access point configures reporting periods based on channel conditions, QoS requirements, and incumbent user activity patterns. This periodic approach maintains timely detection capability while significantly reducing energy consumption and processing load compared to continuous monitoring.

Inventive Principle:

Principle #19Periodic action

3Reliability

If multiple measurement parameters are monitored to ensure QoS for secondary users, then service quality is improved, but measurement complexity and reporting overhead increase

Engineering Contradiction:

Improvequality of serviceVSAvoidmeasurement complexity

Core Design Contradiction:

ReliabilityVSDevice complexity

Solution Approach 1:

The patent applies local quality by configuring different measurement parameters and reporting requirements for different wireless stations based on their specific conditions. Stations experiencing good channel conditions may monitor fewer parameters, while stations in critical positions or with stringent QoS requirements monitor additional parameters such as signal strength, interference levels, and channel occupancy duration. This differentiated approach ensures QoS where needed while reducing overall measurement complexity.

Inventive Principle:

Principle #3Local quality

Data Source

PatentUS7756058B2Spectrum measurement management for dynamic spectrum access wireless systems

Publication Date: 2010.07.13 KONINKLIJKE PHILIPS NV

AI summary

A wireless system (100) and method (401-403) includes a medium access control (MAC) layer adapted to request and receive measurement reports from wireless devices (102) operating in restricted channels.