Cognitive Radio Spectrum Allocation via Database Intermediary
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Solution Overview
Problem
The challenge in wireless communication networks is to dynamically allocate RF spectrums among transmitters without interfering with licensed users in protected regions, particularly in the 'white spaces' between digital channels, while ensuring efficient use of RF frequency bands.
Innovation Solution
The system employs cognitive radio technology, where communication systems communicate with a cognitive radio controller to identify available RF spectrums and determine maximum power levels for transmission, ensuring non-interference with incumbent transmitters by evaluating aggregate interference effects and adjusting transmission characteristics based on geographic location and system policies.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If cognitive radio systems dynamically allocate RF spectrums in white spaces, then spectrum utilization efficiency is improved, but interference risk to licensed incumbent users increases
Solution Approach 1:
The system implements a database that stores geographic locations, service contours, and coordination areas of incumbent transmitters. Cognitive radio systems query this database to receive feedback information about available spectrums and power levels, enabling dynamic spectrum allocation while preventing interference through continuous information updates and adjustments
Solution Approach 2:
The patent introduces a database as an intermediary between cognitive radio systems and incumbent transmitters. This database mediates spectrum allocation by storing and providing information about incumbent transmitter locations, service contours, and coordination areas, allowing cognitive systems to identify available white spaces without direct interference
2Reliability
If transmission power levels are increased to improve communication quality, then signal reliability is improved, but interference to incumbent transmitters worsens
Solution Approach 1:
The system dynamically adjusts transmission parameters including power levels, frequency selections, and modulation schemes based on real-time spectrum availability and incumbent transmitter locations. The database provides coordinate information and service contour data that enable cognitive systems to optimize transmission parameters while maintaining reliability and preventing interference
3Quantity of substance
If more RF spectrums are allocated to support growing wireless devices, then system capacity is improved, but complexity of spectrum management increases
Solution Approach 1:
Cognitive radio systems autonomously query the database for available spectrum information and automatically adjust their transmission parameters. The system performs self-service by independently identifying white spaces, selecting appropriate frequencies, and configuring power levels without requiring manual intervention, thereby managing increased spectrum capacity while controlling complexity
Data Source
AI summary
A method (300, 400) and a communication system (104, 106, 200) for dynamic RF spectrum allocation among a plurality of RF transmitters (108, 110, 112). A message can be received from a first communication system. The message can include a request (130) for available RF spectrum over which to transmit RF signals. The message can indicate a geographic location of a first non-incumbent transmitter (112) associated with the first communication system. Further, for the RF spectrum, a maximum power level can be determined at which the first non-incumbent transmitter may transmit without exceeding a threshold level of interference at least one focal point (134). A RF spectrum list (138) identifying at least the RF spectrum and the determined maximum power level can be communicated to the first communication system.