Spectrum Access System Coordination for CBRS Interference Reduction
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Solution Overview
Problem
Contentions arise in Citizens Broadband Radio Service (CBRS) systems due to different spectrum access systems (SASs) allocating different frequency spectrums to General Authorized Access (GAA) CBSDs, leading to increased interference and reduced maximum transmit power to maintain interference-free zones.
Innovation Solution
A method is implemented by a spectrum access system (SAS) to receive and synchronize data from other SASs, generate a common network graph, identify contentions, and adjust frequency spectrums and power levels to align with acceptance criteria, thereby reducing interference and increasing transmit power and bandwidth.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If different SASs allocate different frequency spectrums to GAA CBSDs independently, then each SAS can optimize its own spectrum usage, but interference increases and maximum transmit power must be reduced
Solution Approach 1:
The patent merges the spectrum allocation decisions of multiple independent SASs by having them exchange allocation information and reach consensus through iterative negotiation. This combines previously separate allocation processes into a coordinated system that reduces interference while maintaining overall spectrum efficiency.
Solution Approach 2:
The patent implements feedback mechanisms where SASs exchange information about their frequency spectrum allocations and adjust their decisions based on responses from other SASs. This iterative feedback process allows the system to converge on allocations that minimize interference while preserving productivity.
2Object-affected harmful factors
If SASs coordinate to reduce interference, then interference decreases and transmit power can be increased, but system complexity increases due to information exchange and consensus mechanisms
Solution Approach 1:
The patent segments the coordination process into discrete iterative steps where SASs exchange information in manageable rounds. Each iteration focuses on specific allocations, breaking down the complex coordination task into smaller, more manageable segments that reduce overall system complexity.
Solution Approach 2:
The patent employs dynamic adjustment where the level of coordination and information exchange can be adapted based on system conditions. The iterative nature allows the system to dynamically converge on solutions, adjusting the complexity of interactions as needed to balance coordination benefits against system complexity.
3Object-affected harmful factors
If maximum transmit power is reduced to maintain interference-free zones, then interference thresholds are maintained, but transmit bandwidth and overall system capacity decrease
Solution Approach 1:
The patent changes the allocation parameters (frequency spectrum assignments) across multiple SASs to find configurations that allow higher transmit powers without exceeding interference thresholds. By adjusting these parameters collectively rather than independently, the system achieves better overall capacity while maintaining compliance.
Data Source
AI summary
Techniques are provided for diminishing (a) interference at GAA CBSD(s), and/or (b) maximum transmit power(s) of each of one or more GAA CBSD(s) by eliminating contention(s) between one or more pairs of spectrum access systems.