CBRS Interference Classification for Spectrum Utilization
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Solution Overview
Problem
In the Citizens Broadband Radio Service (CBRS) band, existing technologies face challenges in effectively managing interference between Citizens Broadband Radio Service Devices (CBSDs) operating in different channels, radio access technologies, and with overlapping downlink and uplink cycles, leading to potential interference issues despite the use of guard bands or other mitigation tools.
Innovation Solution
A network node, such as a Spectrum Access System (SAS) or Coexistence Manager (CxM), classifies interference connections based on calculated interference levels and performs actions like channel assignments to mitigate interference. This involves determining if CBSDs are operating in alternate, adjacent, or the same channels, and applying policies to reduce interference, including using static, dynamic, or probabilistic thresholds to manage interference levels.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If multiple CBSDs operate in the CBRS band with different radio access technologies and overlapping downlink/uplink cycles, then spectrum utilization and productivity are improved, but interference between CBSDs increases
Solution Approach 1:
The patent segments CBSDs into different interference connection types (Type 1, Type 2, Type 3) based on their interference characteristics. Type 1 connections require strict orthogonal resource allocation, Type 2 connections allow partial overlap with mitigation, and Type 3 connections permit flexible sharing. This segmentation enables the system to maximize spectrum utilization for compatible CBSDs while applying appropriate interference protection measures only where necessary.
Solution Approach 2:
The patent implements dynamic interference management by continuously monitoring interference levels and adjusting resource allocation policies in real-time. The system can dynamically transition CBSDs between different interference connection types based on current network conditions, traffic demands, and interference measurements, allowing optimal spectrum utilization while maintaining interference thresholds.
2Object-affected harmful factors
If guard bands are used to mitigate interference between adjacent channels, then interference is reduced, but spectrum efficiency and productivity decrease
Solution Approach 1:
The patent changes the parameter of channel separation from fixed guard bands to variable interference thresholds. Instead of always allocating full guard bands between channels, the system calculates actual interference levels and adjusts the effective separation requirement dynamically. This allows minimal or no guard bands when interference is naturally low, while applying larger separations only when needed, thereby maximizing spectrum efficiency while maintaining interference protection.
3Object-affected harmful factors
If CBSDs are assigned orthogonal channels to avoid interference, then interference is minimized, but channel availability and productivity for each CBSD are reduced
Solution Approach 1:
The patent applies local quality by treating different CBSD pairs with different interference management policies based on their specific characteristics. Rather than enforcing uniform orthogonal channel allocation across all CBSDs, the system identifies pairs with compatible characteristics (e.g., different RATs, non-overlapping cycles) and allows them to share channels, while applying strict orthogonal allocation only to incompatible pairs. This localized approach maximizes overall channel availability while maintaining interference protection where required.
Data Source
AI summary
A method and network node for classification of interference connections between Citizens Broadband Radio Service Devices, CBSDs, in a wireless communication network are provided. According to one aspect, a method includes calculating an interference level, the calculation being based on whether two interfering CBSDs are operating in one of the alternate channels, adjacent channels and the same channel. The method also includes comparing the calculated interference level to a threshold to determine a classification of an interference connection.