White Space Device Power Control via Geolocation Database
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Solution Overview
Problem
The existing methods for allocating frequency spectrum lead to waste due to fixed allocation, resulting in unused portions known as white spaces, and there is a need for a more efficient way to utilize these spaces without causing interference to primary systems.
Innovation Solution
A method using a geolocation database to determine the maximum transmission power for secondary devices based on estimated signal quality and interference protection, ensuring that secondary systems can use white spaces without harming primary services, by calculating the maximum permitted isotropic radiated power (EIRP) and adaptive location probability degradation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If fixed frequency spectrum allocation is used, then primary systems have guaranteed service quality, but spectrum utilization efficiency deteriorates due to unused white spaces
Solution Approach 1:
The patent implements dynamic transmit power control for white space devices based on real-time location and environmental conditions. The system continuously adjusts transmission parameters to adapt to changing spectrum usage patterns, transforming the static fixed allocation into a dynamic shared access model that maintains primary system reliability while improving overall spectrum utilization
Solution Approach 2:
The system changes key operational parameters including transmit power level, operating frequency, and location coordinates to enable secondary usage of white spaces. By modifying these parameters dynamically based on primary system activity and interference conditions, the patent allows flexible spectrum sharing that improves utilization without compromising primary service quality
2Productivity
If white space devices transmit at high power, then spectrum utilization efficiency improves, but interference to primary systems increases
Solution Approach 1:
The patent applies location-specific transmit power control where white space devices adjust their power levels based on their geographic position relative to primary systems. The system determines maximum permissible power locally at each location using geo-location databases and interference prediction algorithms, ensuring high utilization in safe areas while protecting primary systems in sensitive zones
Solution Approach 2:
The system implements feedback mechanisms where white space devices continuously monitor primary system signals and adjust their transmit power accordingly. By measuring primary system signal strength and calculating potential interference, the system dynamically controls power levels to maximize spectrum usage while maintaining protection ratios that prevent harmful interference
3Object-affected harmful factors
If transmit power control is implemented, then interference protection improves, but system complexity increases
Solution Approach 1:
The patent introduces a geo-location database and interference prediction system as intermediaries between white space devices and primary systems. These intermediaries handle the complex calculations for determining maximum permissible power levels, shielding white space devices from the complexity of interference management while ensuring primary system protection through automated power control
Data Source
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AI summary
In accordance with the example embodiments of the invention there is at least a method, apparatus, and executable computer program to receive a location of a white space device, determine an original probability with which a primary receiver would operate correctly at the location, wherein the original probability is determined without taking interference due to the white space device into account, determine a maximum degradation to the original probability that the white space device may cause at the location, wherein the maximum degradation is based at least in part on an estimated signal quality of a primary system at the location, and determine a maximum transmission power for the white space device based on the maximum degradation.