Hybrid Spectrum Sharing for Cellular and Incumbent Users

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Solution Overview

Problem

Current methods for wireless communication spectrum sharing, such as spectrum sensing-based dynamic spectrum access and database-driven approaches, face challenges in efficiently managing temporal and geographical spectrum sharing between commercial cellular operators and government incumbent operators, especially when dealing with mobile users and potential interference.

Innovation Solution

A hybrid approach combining distributed spectrum sensing and geo-reference databases to enable opportunistic access to government spectrum bands, using a two-tier resource allocation process that minimizes interference and maximizes available spectrum usage, while maintaining acceptable quality of service and fairness among users.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Productivity

If spectrum sensing-based dynamic spectrum access techniques are used to enable secondary users to access primary user spectrum, then spectrum utilization efficiency is improved, but system complexity and difficulty of detecting and measuring primary user activity increase

Engineering Contradiction:

Improvespectrum utilization efficiencyVSAvoiddifficulty of detecting primary user activity

Core Design Contradiction:

ProductivityVSDifficulty of detecting and measuring

Solution Approach 1:

The patent introduces spectrum sensing entities that act as intermediaries between secondary users and primary users. These sensing entities monitor primary user spectrum usage and provide information to secondary users, enabling spectrum access without direct detection by secondary users. This mediator approach improves spectrum utilization while reducing the detection burden on secondary users.

Inventive Principle:

Principle #24Intermediary (Mediator)

Solution Approach 2:

The system implements feedback mechanisms where spectrum sensing results are continuously reported and used to adjust spectrum access decisions. Primary user activity detection feedback enables dynamic spectrum allocation, improving overall spectrum efficiency while maintaining protection for primary users through automated response to detected activity.

Inventive Principle:

Principle #23Feedback

2Ease of operation

If database-driven dynamic spectrum access is used to provide spectrum allocation information to secondary users, then spectrum access coordination is improved, but information completeness and reliability deteriorate due to coarse resolution of historical spectrum use

Engineering Contradiction:

Improvespectrum access coordinationVSAvoidinformation completeness of spectrum usage data

Core Design Contradiction:

Ease of operationVSLoss of information

Solution Approach 1:

The patent merges database-driven spectrum allocation with real-time spectrum sensing capabilities. The system combines historical spectrum usage data from databases with current sensing information, creating a more complete and accurate picture of spectrum availability. This hybrid approach maintains ease of coordination while improving information completeness by supplementing coarse historical data with fine-grained real-time measurements.

Inventive Principle:

Principle #5Merging (Combining)

3Quantity of substance

If opportunistic access to government spectrum bands is enabled through hybrid sensing and database approaches, then spectrum resources for commercial networks are increased, but interference risk to incumbent users increases

Engineering Contradiction:

Improvespectrum resources availableVSAvoidinterference to incumbent users

Core Design Contradiction:

Quantity of substanceVSObject-affected harmful factors

Solution Approach 1:

The system performs preliminary spectrum sensing and database verification before allowing secondary users to access primary user spectrum. By checking spectrum availability in advance and establishing access conditions beforehand, the system enables opportunistic access while pre-establishing protection mechanisms against interference to incumbent users.

Inventive Principle:

Principle #10Preliminary action

Solution Approach 2:

The patent implements dynamic spectrum access where secondary user transmission parameters are continuously adjusted based on real-time sensing of primary user activity. This dynamic adaptation allows the system to maximize spectrum utilization while maintaining interference levels below acceptable thresholds through automated power and resource adjustments.

Inventive Principle:

Principle #15Dynamics

4Productivity

If two-tier resource allocation process is implemented to allocate spectrum to cell zones and then to users, then resource allocation efficiency is improved, but system complexity increases

Engineering Contradiction:

Improveresource allocation efficiencyVSAvoidallocation system complexity

Core Design Contradiction:

ProductivityVSDevice complexity

Solution Approach 1:

The patent segments the spectrum allocation process into two distinct tiers: first allocating spectrum resources to cell zones based on macro-level spectrum availability and demand, then allocating within zones to individual users based on micro-level conditions. This segmentation improves allocation efficiency by handling different scales of decision-making separately, while the modular structure manages complexity through clear separation of allocation responsibilities.

Inventive Principle:

Principle #1Segmentation

Data Source

PatentUS10568104B2System and method for heterogenous spectrum sharing between commercial cellular operators and legacy incumbent users in wireless networks

Publication Date: 2020.02.18 FEDERATED WIRELESS

AI summary

Described herein are systems and methods for telecommunications spectrum sharing between multiple heterogeneous users, which leverage a hybrid approach that includes both distributed spectrum sharing, spectrum-sensing, and use of geo-reference databases.