CBSD Transmit Expiration Exception Protocol for Spectrum Access

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Solution Overview

Problem

The existing Citizen's Broadband Radio Service (CBRS) systems face disruptions due to communication outages between Citizen Broadband Radio Service Devices (CBSDs) and Spectrum Access Systems (SAS), leading to potential interference with dynamic incumbent radio systems and resulting in service interruptions, especially during critical events or natural disasters.

Innovation Solution

The implementation of a transmit expiration parameter exception protocol that allows CBSDs to continue operating beyond the standard transmit expiration time when communication with the SAS is lost, ensuring continuous service during critical events or disruptions.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If CBSDs strictly follow the standard transmit expiration time parameter to ensure interference protection with dynamic incumbents, then incumbent protection is improved, but service continuity deteriorates during communication outages

Engineering Contradiction:

Improveincumbent protectionVSAvoidservice continuity

Core Design Contradiction:

ReliabilityVSDuration of action of stationary object

Solution Approach 1:

The patent implements dynamic behavior by allowing CBSDs to adapt their transmit expiration time based on communication status. When SAS communication is available, CBSDs follow standard expiration times to protect incumbents. When communication is lost, CBSDs dynamically extend their operation beyond the standard expiration time, transitioning from static to dynamic time management to maintain service continuity.

Inventive Principle:

Principle #15Dynamics

Solution Approach 2:

The patent changes the time parameter from a fixed standard value to a variable value based on communication status. The transmit expiration time parameter is modified from a constant standard value to a dynamic value that extends beyond the standard time when SAS communication is lost, allowing the system to balance incumbent protection with service continuity based on operational conditions.

Inventive Principle:

Principle #35Parameter changes

2Duration of action of stationary object

If CBSDs extend operation beyond standard transmit expiration time during outages, then service availability is improved, but interference risk with dynamic incumbents increases

Engineering Contradiction:

Improveservice availabilityVSAvoidinterference risk

Core Design Contradiction:

Duration of action of stationary objectVSObject-affected harmful factors

Solution Approach 1:

The patent applies preliminary action by having CBSDs monitor SAS communication status and prepare for extended operation in advance of actual outages. When communication degradation is detected, CBSDs proactively transition to extended transmit expiration time mode, ensuring seamless service continuity without waiting for complete communication failure.

Inventive Principle:

Principle #10Preliminary action

Solution Approach 2:

The patent implements feedback mechanisms where CBSDs continuously monitor their communication status with SAS and adjust their transmit expiration time accordingly. This closed-loop feedback allows CBSDs to extend operation only when necessary (during outages) and revert to standard times when communication is restored, dynamically balancing service availability with interference protection.

Inventive Principle:

Principle #23Feedback

3Reliability

If CBSDs maintain continuous communication monitoring to detect outages, then service reliability is improved, but system complexity increases

Engineering Contradiction:

Improveservice reliabilityVSAvoidcommunication monitoring

Core Design Contradiction:

ReliabilityVSDevice complexity

Solution Approach 1:

The patent applies self-service by enabling CBSDs to autonomously monitor their own communication status with SAS and independently determine when to extend their transmit expiration time. Each CBSD manages its own time parameter based on its local communication conditions, eliminating the need for centralized monitoring and reducing overall system complexity while maintaining high reliability.

Inventive Principle:

Principle #25Self-service

Data Source

PatentUS12295026B2Systems and methods for managing priority exceptions for shared spectrum radio services

Publication Date: 2025.05.06 OUTDOOR WIRELESS NETWORKS LLC

AI summary

Systems and methods for managing priority exceptions for shared spectrum radio services are provided. In one embodiment, a shared spectrum radio services system comprises: a spectrum access system (SAS) configured to adjust transmit power levels of one or more radios, wherein the one or more radios transmit on a protected frequency of a shared spectrum, wherein the SAS is associated with a protection area that comprises at least one dynamic incumbent RF system that transmits on the protected frequency; and wherein the SAS applies a standard transmit expiration time parameter to the one or more radios, the standard transmit expiration time parameter indicating a time of day at which authorization to transmit on the protected frequency expires; and wherein the SAS is configured to execute a transmit expiration parameter exception protocol to override the standard transmit expiration time parameter for at least one of the one or more radios.