Wireless Spectrum Sharing via Base Station Coordination

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Solution Overview

Problem

Current wireless communication systems, such as 4G-LTE, are limited by orthogonal licensing of spectrum, which restricts each operator to a specific band, leading to inefficiencies like adjacent channel interference and wasted spectrum, and prevents users from connecting to the strongest signal across different operators.

Innovation Solution

The system enables simultaneous sharing of spectrum among multiple wireless network operators by allowing Base Stations from different operators to use the same frequency spectrum, with advanced techniques like preamble planning, pilot planning, and fractional frequency reuse to manage interference and ensure efficient spectrum utilization.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If orthogonal licensing of spectrum is used to allocate specific bands to each operator, then interference between operators is reduced, but spectrum utilization efficiency deteriorates and adjacent channel interference is caused

Engineering Contradiction:

Improveinterference reductionVSAvoidspectrum utilization efficiency

Core Design Contradiction:

ReliabilityVSProductivity

Solution Approach 1:

The patent merges the spectrum resources of multiple operators by enabling them to share the same frequency band simultaneously. Multiple base stations from different operators transmit on the same spectrum without traditional orthogonal separation, thereby improving spectrum utilization efficiency while managing interference through coordinated techniques.

Inventive Principle:

Principle #5Merging (Combining)

Solution Approach 2:

The patent introduces dynamic spectrum sharing where operators can flexibly allocate and share spectrum resources based on real-time network conditions and demand. This dynamic approach allows efficient utilization of spectrum while adapting to varying interference scenarios through coordinated resource management.

Inventive Principle:

Principle #15Dynamics

2Stability of the object's composition

If each operator is restricted to its licensed band, then network stability is maintained, but users cannot connect to the strongest signal across different operators

Engineering Contradiction:

Improvenetwork stabilityVSAvoidsignal connection flexibility

Core Design Contradiction:

Stability of the object's compositionVSAdaptability or versatility

Solution Approach 1:

The patent enables base stations to serve multiple functions by allowing users to connect to any operator's base station within the shared spectrum, not just their home operator. This multi-functionality improves signal connection flexibility while maintaining network stability through coordinated resource management and interference mitigation techniques.

Inventive Principle:

Principle #6Universality (Multi-functionality)

Solution Approach 2:

The patent introduces coordination mechanisms and signaling protocols that act as intermediaries between different operators' networks. These intermediaries enable stable spectrum sharing by managing resource allocation, coordinating transmissions, and ensuring that users can connect to the strongest signal while maintaining overall network stability.

Inventive Principle:

Principle #24Intermediary (Mediator)

3Productivity

If multiple operators share the same frequency spectrum simultaneously, then spectrum efficiency is improved, but interference management complexity increases

Engineering Contradiction:

Improvespectrum efficiencyVSAvoidinterference management complexity

Core Design Contradiction:

ProductivityVSDevice complexity

Solution Approach 1:

The patent segments the shared spectrum into different resource blocks, time slots, or spatial layers that can be dynamically allocated to different operators. This segmentation reduces interference management complexity by organizing the shared spectrum into manageable units while maintaining high spectrum efficiency through flexible resource allocation.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The patent implements feedback mechanisms where base stations continuously monitor interference levels and adjust their transmissions accordingly. This feedback-driven approach simplifies interference management by enabling dynamic adaptation to changing conditions while maintaining high spectrum efficiency through coordinated resource optimization.

Inventive Principle:

Principle #23Feedback

4Loss of energy

If premium spectrum bands are exclusively licensed to single operators, then operator revenue is maximized, but network throughput is limited

Engineering Contradiction:

Improvespectrum cost efficiencyVSAvoidnetwork throughput

Core Design Contradiction:

Loss of energyVSProductivity

Solution Approach 1:

The patent merges the spectrum holdings of multiple operators by enabling simultaneous access to the same premium spectrum bands. This merging increases network throughput by allowing more users to access high-quality spectrum resources while improving cost efficiency through shared spectrum utilization and reduced need for exclusive licensing.

Inventive Principle:

Principle #5Merging (Combining)

Data Source

PatentUS12289609B2Simultaneous sharing of spectrum in wireless communications

Publication Date: 2025.04.29 INDIAN INST OF TECH MADRAS

AI summary

systems for simultaneous sharing of spectrum in wireless communications. Base Stations (BSs) of a plurality of mobile network operators in a cell may send downlink signals to their respective connected User Equipments (UEs) through a shared frequency spectrum. Further, the BSs may receive uplink signals from the UEs in the shared frequency spectrum.