Dynamic Spectrum Separation Distance Adjustment
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Solution Overview
Problem
Current spectrum management systems in wireless communications, particularly in TV white spaces, face challenges in accurately determining the location of secondary radio devices, leading to potential interference with incumbent users due to imprecise geo-location reporting, which is often not accurate to the ±50 meters required by regulations.
Innovation Solution
The system dynamically adjusts separation distances between primary and secondary spectrum users based on the accuracy of the location reported by secondary devices, using a spectrum management server to increase the separation distance when location accuracy is below the required threshold, thereby maintaining protection for incumbent users while allowing secondary users to access available spectrum.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a fixed separation distance is used based on regulatory requirements, then incumbent users are protected, but secondary users cannot access spectrum when location accuracy is insufficient
Solution Approach 1:
The patent applies dynamics by transitioning from a fixed separation distance to a dynamically adjusted separation distance that varies based on the actual location accuracy of secondary users. The system calculates a confidence level based on location accuracy metrics and adjusts the separation distance accordingly - increasing it when location accuracy is poor and decreasing it when location accuracy is good, thereby enabling spectrum access while maintaining protection.
Solution Approach 2:
The patent changes the parameter of separation distance from a static regulatory value to a dynamic value that is modified based on location accuracy parameters. By introducing a confidence level calculation that incorporates location accuracy metrics, the system adjusts the separation distance parameter to reflect actual conditions, allowing secondary users to access spectrum when their location can be determined with sufficient accuracy.
2Measurement precision
If location accuracy is improved to meet regulatory requirements, then spectrum access is enabled, but device complexity and cost increase
Solution Approach 1:
The system dynamically adjusts separation distances based on the actual location accuracy achieved by secondary users, rather than requiring all users to achieve a fixed accuracy threshold. This allows users with lower-cost, lower-accuracy location determination methods to access spectrum by operating with larger separation distances, while users with higher-accuracy capabilities can operate with smaller separation distances.
Solution Approach 2:
The patent changes the separation distance parameter based on the location accuracy parameter provided by secondary users. Instead of enforcing a minimum location accuracy requirement, the system accepts various location accuracy levels and adjusts the separation distance accordingly, allowing users to choose their own geo-location determination capability based on their needs and budget.
3Ease of operation
If a single separation distance is specified for all devices, then implementation is simple, but interference protection is insufficient when location accuracy varies
Solution Approach 1:
The patent implements a dynamic adjustment mechanism where the separation distance is automatically calculated based on the location accuracy of each secondary user. The system computes a confidence level from location accuracy metrics and uses this to determine an appropriate separation distance, balancing simplicity of operation with reliable interference protection through automated adjustment.
Solution Approach 2:
The system incorporates feedback by using the location accuracy information provided by secondary users to adjust the separation distance. The confidence level calculation based on location accuracy metrics feeds back into the separation distance determination, creating a closed-loop system that automatically adapts to varying location accuracy conditions while maintaining protection for incumbent users.
Data Source
AI summary
Allocating spectrum to a secondary radio device includes determining a contour separation distance for the secondary radio device. The contour separation distance is a function of a minimum separation distance from protected areas of primary radio devices and an accuracy variance for the secondary radio device. The accuracy variance is specified as a distance and is a function of accuracy information for a reported location of the secondary radio device. If a distance between a contour of a protected area for a primary radio device and the reported location for the secondary radio device is less than the contour separation distance, a channel used by the primary radio device is not available for use by the secondary radio device for wireless communications. Otherwise the channel used by the primary radio device is available for use by the secondary radio device for wireless communications.