Objective Function for CBRS Channel Assignment
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Solution Overview
Problem
Current objective functions for channel assignment in shared spectrum scenarios, such as those used in the Citizens Broadband Radio Service (CBRS), are too simplistic and do not consider factors like channel usability, contiguous spectrum allocation, long-term stability, fairness, and user value.
Innovation Solution
A new objective function is introduced that takes into account channel usability, contiguous spectrum allocation, spectrum allocation stability, fairness, and user value to determine optimal channel assignments for CBSDs in the CBRS band.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a simple objective function is used for channel assignment, then the determination process is fast and simple, but the channel assignment does not consider important factors like channel usability, contiguous spectrum allocation, long-term stability, fairness, and user value
Solution Approach 1:
The patent transforms the channel assignment problem by changing the parameters of the objective function to include multiple dimensions: channel usability, contiguous spectrum allocation, long-term stability, fairness, and user value. This allows the system to evaluate channel assignments based on comprehensive criteria rather than simple metrics, resolving the contradiction between simplicity and quality.
Solution Approach 2:
The objective function is segmented into multiple independent components, each evaluating a specific aspect of channel assignment (usability, contiguity, stability, fairness, user value). This segmentation allows the system to handle complex evaluations systematically while maintaining computational efficiency by processing each component separately.
2Reliability
If channel assignment considers multiple factors including channel usability, contiguous spectrum allocation, long-term stability, fairness, and user value, then the channel assignment quality improves, but the determination process becomes more complex
Solution Approach 1:
The complex objective function is divided into separate evaluation components for each factor (channel usability, contiguous spectrum allocation, long-term stability, fairness, user value). This segmentation enables systematic evaluation of multiple factors while maintaining manageable complexity through modular processing of each criterion.
Solution Approach 2:
The patent adds multiple dimensions to the channel assignment evaluation by introducing new criteria beyond traditional metrics. This dimensional expansion allows the system to consider usability, contiguity, stability, fairness, and user value simultaneously, transforming a one-dimensional optimization problem into a multi-dimensional one that captures real-world complexities.
3Productivity
If traditional channel assignment methods are used, then the implementation is straightforward, but they fail to maximize channel usability and ensure stable long-term allocations
Solution Approach 1:
The objective function performs preliminary evaluation of multiple factors before final channel assignment is made. By assessing channel usability, contiguity, stability, fairness, and user value in advance, the system can make more informed decisions that simultaneously maximize spectrum utilization and ensure long-term allocation stability.
Solution Approach 2:
The patent changes the evaluation parameters to include both productivity metrics (channel usability, spectrum utilization) and stability metrics (long-term allocation consistency, fairness). This parameter transformation enables the system to optimize for both immediate productivity and long-term stability rather than prioritizing one over the other.
Data Source
AI summary
There is provided a method in a controlling node for determining channel assignment for different network nodes. The method comprises: determining a channel assignment based at least on a factor, the factor including one or more of channel usability, contiguous spectrum allocation, spectrum allocation stability and user value; and transmitting the determined channel assignment to a network node.