AFC Controller I/N Contour Database for Spectrum Access
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Solution Overview
Problem
The increasing demand for RF spectrum in wireless communications poses challenges in efficiently allocating, allotting, and assigning shared spectrum while protecting incumbent users from interference by non-incumbent RLAN transmissions, particularly in bands like the 6 GHz band, where existing systems lack simplicity and rapid spectrum availability determination.
Innovation Solution
A shared-spectrum AFC controller that retrieves parameters for high-priority users, computes interference-to-noise power ratio (I/N) contour values, and determines available frequency channels by considering RLAN-reported locations and characteristics, using a centralized database to manage exclusion zones and provide channel availability responses efficiently.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a SAS controls spectrum access among multiple users with different priority levels, then incumbent users are protected from interference, but the system complexity and computational burden increase
Solution Approach 1:
The system pre-calculates and stores I/N contour values for different geographic locations and incumbent configurations before actual spectrum allocation. This preliminary computation of interference contours allows the SAS to quickly determine channel availability without performing complex real-time calculations, thus protecting incumbents while reducing operational complexity
Solution Approach 2:
The service area is divided into discrete geographic locations with pre-computed I/N contours. By segmenting the continuous geographic space into manageable location units, each with its own stored contour data, the system simplifies the interference assessment process while maintaining accurate protection of incumbent users
2Measurement precision
If real-time interference calculations are performed for each spectrum access request, then accurate channel availability determination is achieved, but the response time and computational load increase
Solution Approach 1:
I/N contour values are pre-calculated for all possible geographic locations and incumbent configurations before runtime. When a spectrum access request arrives, the system simply retrieves the pre-computed contour values from storage and compares them with the requesting device's parameters, eliminating the need for time-consuming real-time interference calculations while maintaining accurate channel availability determination
Solution Approach 2:
Instead of performing complex interference calculations from first principles for each request, the system creates and stores copies of pre-computed I/N contour data for different locations and scenarios. These stored contour copies serve as lookup tables that provide accurate interference assessment information instantly without requiring repeated computational analysis
3Measurement precision
If comprehensive parameters for all users are stored and processed, then accurate interference assessment is achieved, but the database size and processing requirements increase
Solution Approach 1:
The system extracts and stores only the essential I/N contour values that are necessary for interference assessment, rather than storing complete user parameter sets for all possible scenarios. By extracting only the critical contour information needed for channel availability determination, the system maintains accurate interference assessment while significantly reducing data storage requirements
Solution Approach 2:
The system stores I/N contour values specific to each geographic location and incumbent configuration rather than maintaining comprehensive global parameter sets. Each location has its own localized contour data that is tailored to the specific interference conditions in that area, providing accurate local interference assessment while minimizing overall data storage requirements through location-specific optimization
Data Source
AI summary
Improved techniques are provided for managing frequency channels in a shared spectrum available to a radio local access network device (RLAN) in a wireless network. A shared spectrum system may perform operations including retrieving a plurality of parameters for one or more high-priority users in the wireless network; computing, based on the retrieved parameters, a plurality of interference-to-noise power ratio (I/N) contour values; storing the plurality of I/N contour values in a database; receiving, from the RLAN in the wireless network, a request for channel availability, wherein the received request includes at least a first value; extracting, based on the first value in the request for channel availability, I/N contour values from the database exceeding a threshold value; determining, based on the extracted I/N contour values, available frequency information corresponding to the received request for channel availability; and transmitting a channel availability response comprising the available frequency information.