Spectrum Access System Interference Budget Management

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Solution Overview

Problem

Conventional methods for managing shared radio frequency spectrum require detailed information exchange between Spectrum Access Systems (SASs) to protect incumbents from aggregate interference, leading to complexity and inefficiency, especially in scenarios with multiple SASs managing user transmissions in the same geographic area.

Innovation Solution

Each SAS independently manages its users by calculating its own move list based on a tight bound on the aggregate interference distribution, allowing it to suspend users without sharing sensitive information or using conventional algorithms, ensuring that a specified percentile of aggregate emissions does not exceed a threshold.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If detailed information exchange between SASs is implemented to protect incumbents from aggregate interference, then incumbent protection reliability is improved, but system complexity and computational burden increase

Engineering Contradiction:

Improveincumbent protectionVSAvoidsystem complexity

Core Design Contradiction:

ReliabilityVSDevice complexity

Solution Approach 1:

The patent divides the aggregate interference management into independent segments by allocating specific interference budgets to each SAS. Each SAS independently manages its own users within its budget without needing global information exchange, thereby maintaining incumbent protection while reducing system complexity.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

Each SAS autonomously determines its move list by independently calculating interference contributions and making suspension decisions based on its allocated budget. This self-service approach eliminates the need for complex inter-SAS coordination while ensuring incumbent protection through decentralized decision-making.

Inventive Principle:

Principle #25Self-service

2Measurement precision

If conventional algorithms with global knowledge are used for move list calculation, then incumbent protection accuracy is improved, but computational efficiency and processing speed decrease

Engineering Contradiction:

Improvemove list calculation accuracyVSAvoidcomputational efficiency

Core Design Contradiction:

Measurement precisionVSProductivity

Solution Approach 1:

The patent segments the move list calculation process by allowing each SAS to independently compute its portion based on local information and allocated budgets. This eliminates the need for computationally intensive global optimization algorithms while maintaining sufficient accuracy for incumbent protection.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

Each SAS independently determines its move list by calculating interference contributions from its own users and applying its allocated budget, eliminating the need for iterative global optimization computations and significantly improving processing speed.

Inventive Principle:

Principle #25Self-service

3Reliability

If SASs share sensitive user information for coordinated interference management, then aggregate interference control is improved, but information security and system privacy deteriorate

Engineering Contradiction:

Improveinterference controlVSAvoidinformation security

Core Design Contradiction:

ReliabilityVSLoss of information

Solution Approach 1:

The patent introduces an interference budget as an intermediary parameter that mediates between individual SAS operations and aggregate interference control. Each SAS receives a budget allocation from the coordinator and independently manages its users within this budget, eliminating the need to share sensitive user information while maintaining interference control.

Inventive Principle:

Principle #24Intermediary (Mediator)

4Ease of operation

If independent SAS management without information exchange is implemented, then system simplicity and operational flexibility are improved, but incumbent protection reliability may deteriorate

Engineering Contradiction:

Improveoperational flexibilityVSAvoidincumbent protection

Core Design Contradiction:

Ease of operationVSReliability

Solution Approach 1:

The patent applies preliminary action by allocating interference budgets to each SAS before independent operation begins. This pre-planned budget distribution ensures that even without ongoing information exchange, each SAS operates within constraints that collectively guarantee incumbent protection while maintaining operational flexibility.

Inventive Principle:

Principle #10Preliminary action

Data Source

PatentUS11968540B2Independently managing wireless transmission by individual spectrum access systems in a shared radio frequency spectrum

Publication Date: 2024.04.23 THE GOVERNMENT OF THE UNITED STATES OF AMERICA AS REPRESENTED BY THE SECRETARY DEPARTMENT OF HEALTH & HUMAN SERVICES

AI summary

Systems and methods for independently managing wireless transmission by individual spectrum access systems in a radio frequency spectrum shared by a plurality of spectrum access systems. An example method includes: receiving, by the spectrum access system, an interference budget from a sensor; determining, by the spectrum access system, secondary users managed by the spectrum access system in a radio frequency spectrum shared by a plurality of spectrum access systems; managing a move list for the spectrum access system independently of the other spectrum access systems in an absence of exchange of spectrum grant information with the other spectrum access systems; and determining the move list for the spectrum access system from a first moment and a second moment of an aggregate interference distribution such that the spectrum access system provides grants to its secondary users in a dynamic protection area of the spectrum access system.