GAA CBSD Channel and Power Allocation to Reduce Co-Channel Interference

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Solution Overview

Problem

Existing techniques for authorizing GAA CBSDs to transmit in shared spectrum do not account for co-channel interference with other GAA CBSDs, leading to potential communication disruptions.

Innovation Solution

A method to determine channels and maximum transmit power levels for GAA CBSDs that minimize co-channel interference by identifying edges with neighboring CBSDs, adjusting bandwidth and power levels to adhere to quotas, and selecting orthogonal or non-orthogonal channels as needed.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Productivity

If GAA CBSDs are authorized to transmit in shared spectrum without accounting for co-channel interference, then spectrum utilization is improved, but communication reliability deteriorates due to potential disruptions

Engineering Contradiction:

Improvespectrum utilizationVSAvoidcommunication reliability

Core Design Contradiction:

ProductivityVSReliability

Solution Approach 1:

The patent implements a feedback mechanism where the Spectrum Access System (SAS) receives information about neighboring CBSDs and their transmit power levels, then uses this feedback to dynamically adjust authorization decisions. The SAS calculates co-channel interference based on received signal strength indicators (RSSI) and path loss models, and adjusts transmit power quotas accordingly to prevent communication disruptions while maintaining high spectrum utilization.

Inventive Principle:

Principle #23Feedback

Solution Approach 2:

The patent applies preliminary action by having CBSDs report their operational parameters and neighboring CBSD information to the SAS before transmission begins. The SAS pre-calculates potential interference scenarios and establishes transmit power quotas in advance, allowing GAA CBSDs to transmit immediately without real-time coordination delays, thus maintaining both high productivity and reliability.

Inventive Principle:

Principle #10Preliminary action

2Reliability

If transmit power levels are reduced to prevent co-channel interference, then communication reliability is improved, but spectrum utilization deteriorates

Engineering Contradiction:

Improvecommunication reliabilityVSAvoidspectrum utilization

Core Design Contradiction:

ReliabilityVSProductivity

Solution Approach 1:

The patent applies local quality by implementing geographic and frequency-specific transmit power quotas. Instead of uniform power reduction, the SAS calculates individualized power levels for each CBSD based on its specific location, neighboring CBSDs, and channel conditions. This allows some CBSDs to transmit at higher powers in areas with low interference, maintaining spectrum utilization while ensuring communication reliability where needed.

Inventive Principle:

Principle #3Local quality

Solution Approach 2:

The patent implements dynamics by making transmit power quotas adjustable and time-varying. The SAS continuously monitors channel conditions, neighboring CBSD activities, and interference levels, then dynamically updates power quotas to optimize the balance between reliability and productivity. This allows the system to adapt to changing conditions rather than relying on static power reductions.

Inventive Principle:

Principle #15Dynamics

3Reliability

If co-channel interference is accounted for in authorization decisions, then communication reliability is improved, but system complexity increases

Engineering Contradiction:

Improvecommunication reliabilityVSAvoidsystem complexity

Core Design Contradiction:

ReliabilityVSDevice complexity

Solution Approach 1:

The patent uses the Spectrum Access System (SAS) as an intermediary that centralizes the complex interference calculation and coordination functions. Individual CBSDs don't need to implement complex interference avoidance algorithms; instead, they report their parameters to the SAS, which performs the sophisticated calculations and returns simplified authorization decisions with transmit power quotas, thus improving reliability without significantly increasing complexity at the CBSD level.

Inventive Principle:

Principle #24Intermediary (Mediator)

Solution Approach 2:

The patent simplifies the system by changing parameters from continuous interference management to discrete transmit power quotas. The SAS calculates optimal power levels based on standardized models (path loss, shadowing) and communicates specific quota values to CBSDs. This parameter-based approach is more manageable than continuous real-time coordination, reducing system complexity while maintaining reliability through scientifically-based power level selections.

Inventive Principle:

Principle #35Parameter changes

Data Source

PatentUS12414054B2Systems and methods for allocating transmit power and optionally a channel to a radio requesting authorization to transmit in shared spectrum

Publication Date: 2025.09.09 OUTDOOR WIRELESS NETWORKS LLC

AI summary

Techniques are provided for determining a channel at and/or a maximum transmit power level in which the requesting General Authorized Access (GAA) citizens broadband radio service device (CBSD) can transmit prior to the next to be executed coordinated periodic activities among spectrum access systems while diminishing co-channel interference between the requesting GAA CBSD and other GAA CBSD(s) in a neighborhood centered around the requesting GAA CBSD.