Spectrum Access System Interference Calculation Optimization
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Solution Overview
Problem
Spectrum Access Systems (SASs) face computational intensity and time constraints in determining which Citizens Broadband Radio Service Devices (CBSDs) to terminate to prevent excessive interference with government communications systems, particularly in dynamic protection areas with millions of protection points, overwhelming processing resources and requiring substantial computation time.
Innovation Solution
The method involves selecting a new protection point, creating an initial sort list of radios, determining look angles, identifying the look angle with the most radios in its main beam, calculating the 95th percentile of aggregate interference power spectral density for each look angle, sorting by this percentile, and generating a move list of radios to be terminated, thereby reducing the number of look angles that need interference calculations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the SAS calculates interference at all protection points in a DPA to determine which CBSDs to terminate, then the interference protection for government communications systems is ensured, but the computational intensity and time required become excessive
Solution Approach 1:
The patent segments the dynamic protection area into multiple sectors, each divided into look angles. Instead of calculating interference at all million+ protection points across the entire DPA, the system processes each sector and look angle independently. This segmentation reduces the computational burden by breaking down the monolithic calculation into manageable chunks that can be processed sequentially or in parallel.
Solution Approach 2:
The patent performs preliminary actions by pre-calculating and storing interference metrics for each look angle before final CBSD termination decisions are made. The system calculates the 95th percentile aggregate interference power spectral density for each look angle in advance, creating a sorted list that identifies the most problematic look angles. This preliminary processing eliminates the need for repeated full-scale calculations when determining CBSD terminations.
2Measurement precision
If the SAS processes all protection points to determine contributing CBSDs, then accurate interference determination is achieved, but the computation time becomes substantial
Solution Approach 1:
The patent applies partial action by calculating interference metrics for only the most critical look angles rather than all possible look angles at all protection points. The system calculates the 95th percentile aggregate interference for each look angle, sorts them, and focuses processing on the top look angles that contribute most to interference. This partial processing approach maintains sufficient accuracy for termination decisions while dramatically reducing computation time.
Solution Approach 2:
The patent extracts and focuses on the most significant interference contributors by calculating metrics for each look angle, sorting them by the 95th percentile aggregate interference power spectral density, and identifying the look angles with the highest interference levels. This extraction of critical information allows the system to make accurate termination decisions based on a subset of the most problematic look angles rather than processing all protection points uniformly.
3Reliability
If the SAS terminates CBSDs to maintain interference thresholds, then protection of incumbent systems is ensured, but the processing resources of the SAS are overwhelmed
Solution Approach 1:
The patent segments the interference calculation process into hierarchical levels: first by sector, then by look angle within each sector. This segmentation allows the SAS to process interference calculations in manageable units rather than attempting to evaluate all protection points simultaneously. The system can terminate CBSDs based on aggregated results from segmented calculations, maintaining incumbent protection while avoiding resource overload.
Solution Approach 2:
The patent changes the parameter of calculation granularity by shifting from calculating interference at every individual protection point to calculating aggregate interference at the look angle level. By using the 95th percentile aggregate interference power spectral density as the key parameter, the system transforms the problem from millions of point-based calculations to a much smaller number of sector and look angle-based calculations, dramatically improving processing efficiency while maintaining protection reliability.
Data Source
AI summary
A method is provided. The method comprises: selecting a new protection point in a dynamic protection area; creating an initial sort list of radios; determining look angles; determining which look angle includes most radios in its main beam; determining a modified sort list and an initial move list for the determined look angle; determining a certain percentile of aggregate interference power spectral density at the new protection point for radios that are in a main beam for each of remaining look angles; sorting, by level of certain percentile of aggregate interference power spectral density, the remaining look angles; and generating a move list of radios.