Communication Control for Dynamic Guard Bands Against Adjacent Interference
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Solution Overview
Problem
In the Citizens Broadband Radio Service (CBRS) with a three-layer hierarchical frequency shared architecture, there is a lack of protection rules for adjacent channel interference, particularly between General Authorized Access (GAA) systems, leading to potential interference issues.
Innovation Solution
A communication control device that calculates an adjacent channel interference ratio and determines a necessary guard band to mitigate interference, ensuring appropriate frequency sharing and network coexistence.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If frequency sharing is implemented without guard bands for adjacent channel interference, then frequency use efficiency is improved, but adjacent channel interference increases
Solution Approach 1:
The patent dynamically adjusts guard band parameters based on calculated adjacent channel interference ratios. When interference ratio exceeds a threshold, the guard band is expanded; when below threshold, the guard band is reduced or eliminated. This parameter adaptation resolves the contradiction by optimizing frequency utilization while maintaining interference protection.
Solution Approach 2:
The system transitions from static guard band configurations to dynamic guard band adjustment. The guard band width is continuously modified based on real-time interference measurements and calculations, allowing the system to adapt to changing spectral conditions and optimize both efficiency and interference protection.
2Reliability
If guard bands are set to protect against adjacent channel interference, then interference protection is improved, but frequency sharing capability deteriorates
Solution Approach 1:
The patent implements dynamic guard band parameter adjustment based on calculated interference ratios. The system monitors actual interference conditions and modifies guard band widths accordingly, allowing maximum frequency sharing when interference is low while providing protection when needed, thus resolving the contradiction between protection and sharing capability.
Solution Approach 2:
The system incorporates feedback mechanisms where interference measurements and calculations are used to adjust guard band settings. This closed-loop control ensures that guard bands are only imposed when necessary, maintaining frequency sharing capability while providing reliable interference protection when detected.
3Device complexity
If existing protection rules are applied without considering adjacent channel interference, then system complexity is reduced, but network coexistence performance deteriorates
Solution Approach 1:
The patent extends existing protection rules by adding dynamic guard band parameters that adapt to adjacent channel interference conditions. This enhancement maintains the simplicity of the basic protection framework while improving network coexistence performance through parameter adaptation rather than fundamental system redesign.
Data Source
AI summary
A communication control device according to an aspect of the present disclosure includes an interference ratio calculating unit that calculates an adjacent channel interference ratio between a first radio system, which is a protection target, and a second radio system, which is an interference source, when the second radio system shares and uses radio wave used by the first radio system and a guard band calculating unit that calculates a guard band necessary for a channel of the first radio system or the second radio system based on the adjacent channel interference ratio.