Spectrum Access System Interference Calculation Timing Management
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Solution Overview
Problem
Spectrum access systems face challenges in managing interference calculations during Coordinated Periodic Activities among SASes (CPAS) periods, especially when a large number of CBSDs operate in a neighborhood, leading to increased costs and complexity due to underutilized processing resources.
Innovation Solution
Implementing a grant request processing function that determines when to perform interference calculations and utilizes Q/N estimate power calculations to steer radios to non-protected frequency channels, allowing these calculations to be performed outside CPAS periods and reducing the computational burden during CPAS periods.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a SAS is equipped with sufficient processing resources to perform extensive interference power calculations during CPAS periods, then the accuracy and completeness of interference management is improved, but the cost and complexity of the SAS increases
Solution Approach 1:
The system performs preliminary actions by calculating and storing interference power values for all CBSDs in the neighborhood during non-CPAS periods. These pre-calculated interference power values are stored in a database and readily available when needed during CPAS periods, eliminating the need for extensive real-time calculations during the limited CPAS window.
Solution Approach 2:
The system prepares cushioning data structures and pre-computes interference power values in advance, creating a buffer of calculated data that can be quickly accessed during CPAS periods. This beforehand preparation ensures that the SAS can handle the computational demands without requiring excessive processing resources during the actual CPAS execution.
2Reliability
If extensive interference power calculations are performed during the limited CPAS period, then the interference management coverage is improved, but the time available for other SAS operations is reduced
Solution Approach 1:
Interference power calculations are performed in advance during non-CPAS periods, so that when the CPAS period arrives, the SAS already has all necessary interference power values stored and ready. This preliminary computation ensures complete interference management coverage is achieved without consuming CPAS period time.
Solution Approach 2:
The system creates copies of interference power calculation results and stores them in a database. Instead of recalculating interference powers during CPAS periods, the SAS retrieves pre-computed copies of these values, significantly reducing the time required during CPAS while maintaining complete interference management coverage.
3Productivity
If Q/N estimate power calculations are used to steer radios to non-protected frequency channels, then the computational burden during CPAS periods is reduced, but the number of frequency channel options for radios is limited
Solution Approach 1:
The system applies different processing strategies based on location and channel type. Q/N estimate power calculations are used specifically for determining whether to steer radios to non-protected frequency channels, while full interference power calculations are performed for authorized CBSDs. This localized application of calculation methods optimizes productivity for steering decisions while maintaining accuracy for authorized operations.
Solution Approach 2:
The system changes the calculation parameter from full interference power evaluation to Q/N estimate power calculation when making steering decisions. This parameter change reduces computational burden during grant request processing, enabling faster evaluation of whether to steer radios to non-protected frequency channels while still providing adequate assessment of interference potential.
Data Source
AI summary
Systems and methods for SAS interference calculation management are provided. In one embodiment, a system comprises: a processor coupled to a memory; a network interface configured to couple the SAS to a network, the processor coupled to the interface; and a grant request processing function executed by the processor, the grant request processing function processes grant requests received from radios located in a neighborhood defined around a protection area, wherein the requests comprises a request to transmit on a protected frequency channel of the protected area; wherein the grant request processing function manages a timing of when to processes interference calculations associated with the grant requests based on or both of: determining whether to steer a requesting radio to a non-protected frequency channel; and at least one Q/N estimate power calculation, wherein Q comprises a value of an allowed interference power limit, and N is a number of authorized radios.