CBRS Spectrum Control Using Silent Period Interference Mapping

Solution Overview

Problem

Existing spectrum controllers in CBRS networks overestimate interference, leading to conservative channel allocation and reduced spectrum availability for network operators, despite the presence of environmental sensing capabilities.

Innovation Solution

Implementing silent periods during which network operators cease transmission and conduct signal strength measurements, allowing for more accurate interference pattern generation and dynamic spectrum allocation.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If conservative predicted interference patterns are used to control CBRS usage, then interference protection is improved, but spectrum availability deteriorates

Engineering Contradiction:

Improveinterference protectionVSAvoidspectrum availability

Core Design Contradiction:

ReliabilityVSQuantity of substance

Solution Approach 1:

The system changes the parameter of interference pattern accuracy by transitioning from conservative predicted patterns to empirically measured patterns obtained during silent periods. This parameter change allows the spectrum controller to allocate channels more efficiently while maintaining adequate interference protection, thereby increasing spectrum availability without sacrificing reliability.

Inventive Principle:

Principle #35Parameter changes

2Measurement precision

If silent periods are implemented for measurement, then measurement precision is improved, but productivity deteriorates

Engineering Contradiction:

Improvesignal strength measurement accuracyVSAvoidspectrum utilization efficiency

Core Design Contradiction:

Measurement precisionVSProductivity

Solution Approach 1:

The system implements periodic silent periods at predetermined intervals to collect signal strength measurements from multiple network operators. These periodic measurements enable the generation of accurate interference patterns that reflect actual multi-network conditions. The periodic nature balances measurement precision with productivity by limiting silent periods to specific intervals rather than continuous operation.

Inventive Principle:

Principle #19Periodic action

Solution Approach 2:

The system performs preliminary signal strength measurements during silent periods before normal spectrum allocation decisions are made. By collecting measurement data in advance during silent periods, the spectrum controller can generate accurate interference patterns that guide subsequent channel allocation, ensuring both measurement precision and efficient spectrum utilization.

Inventive Principle:

Principle #10Preliminary action

3Measurement precision

If sequential silent periods are implemented for multi-network measurement, then interference pattern accuracy is improved, but loss of time increases

Engineering Contradiction:

Improveinterference pattern accuracyVSAvoidspectrum access delay

Core Design Contradiction:

Measurement precisionVSLoss of time

Solution Approach 1:

The system implements periodic silent periods at predetermined intervals to collect signal strength measurements from multiple network operators. These periodic measurements enable the generation of accurate interference patterns that reflect actual multi-network conditions. The periodic nature balances measurement precision with productivity by limiting silent periods to specific intervals rather than continuous operation.

Inventive Principle:

Principle #19Periodic action

Solution Approach 2:

The system performs preliminary signal strength measurements during silent periods before normal spectrum allocation decisions are made. By collecting measurement data in advance during silent periods, the spectrum controller can generate accurate interference patterns that guide subsequent channel allocation, ensuring both measurement precision and efficient spectrum utilization.

Inventive Principle:

Principle #10Preliminary action

Data Source

PatentUS20260012805A1Spectrum control using silent periods

Publication Date: 2026.01.08 CHARTER COMM OPERATING LLC

AI summary

A spectrum controller controlling use of a spectrum, e.g., the CBRS spectrum, shared by multiple network operators. The spectrum controller sequentially instructs each network operator to implement a silent period during which the network operator (i) ceases transmitting in at least part of the spectrum, and optionally (ii) generates signal-strength measurements of signals from other network operators. The spectrum controller receives the signal-strength measurements from the multiple network operators, generates interference patterns between the multiple network operators, and uses those interference patterns to allocate the spectrum to the multiple network operators, including during times of spectrum usage by incumbents. The interference patterns may be more accurate than conventionally generated interference patterns resulting in more-efficient usage of the shared spectrum by the network operators.