Self-Organized Inter-Cell Interference Coordination

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Solution Overview

Problem

Current inter-cell interference coordination (ICIC) techniques in digital communications, such as manual geo-based reuse-three planning and Fractional Frequency Reuse (FFR), face challenges in managing interference effectively, especially in complex scenarios like large metropolitan areas, leading to performance degradation and inefficient frequency resource utilization.

Innovation Solution

A self-organized ICIC system with a hierarchical architecture that automatically determines frequency reuse modes based on signal power measurements and interference levels, allowing for dynamic adjustments and optimized ICIC mode selection across multiple communication controllers.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Productivity

If manual geo-based reuse-three planning is used, then frequency resource utilization is improved, but device complexity and manual intervention increase

Engineering Contradiction:

Improvefrequency resource utilizationVSAvoidmanual intervention

Core Design Contradiction:

ProductivityVSDevice complexity

Solution Approach 1:

The system enables eNBs to automatically perform ICIC operations by measuring interference levels, determining relationship information, and selecting frequency reuse modes without manual intervention. The controller autonomously monitors signal power measurements and adjusts frequency allocation based on detected interference conditions, making the system self-configuring and self-optimizing.

Inventive Principle:

Principle #25Self-service

Solution Approach 2:

The system dynamically changes frequency reuse parameters based on measured interference levels. When interference exceeds thresholds, the controller adjusts frequency allocation parameters and relationship information to optimize resource utilization while maintaining service quality, adapting to changing network conditions in real-time.

Inventive Principle:

Principle #35Parameter changes

2Object-affected harmful factors

If Fractional Frequency Reuse (FFR) is used, then interference management is improved, but adaptability to complex scenarios deteriorates

Engineering Contradiction:

Improveinterference managementVSAvoidadaptability to complex scenarios

Core Design Contradiction:

Object-affected harmful factorsVSAdaptability or versatility

Solution Approach 1:

The system transitions from static FFR configurations to dynamic ICIC where frequency reuse modes are continuously adjusted based on real-time interference measurements. The controller adapts frequency allocation and relationship information dynamically to match changing network conditions, user distributions, and interference patterns in complex metropolitan scenarios.

Inventive Principle:

Principle #15Dynamics

Solution Approach 2:

The system implements closed-loop feedback by continuously measuring signal power and interference levels at eNBs, comparing measurements against thresholds, and adjusting frequency reuse modes accordingly. This feedback mechanism enables the system to adapt to complex scenarios by learning from actual interference patterns and optimizing frequency allocation based on measured performance.

Inventive Principle:

Principle #23Feedback

3Reliability

If automatic ICIC mode selection is implemented, then handover success rate is improved, but measurement precision requirements increase

Engineering Contradiction:

Improvehandover success rateVSAvoidsignal power measurement accuracy

Core Design Contradiction:

ReliabilityVSMeasurement precision

Solution Approach 1:

The system uses multiple measurement thresholds (first threshold for initial ICIC operation, second threshold for relationship information determination) to make incremental decisions. By using partial measurements against multiple thresholds rather than requiring single high-precision measurements, the system achieves reliable handover performance while reducing the burden on measurement precision.

Inventive Principle:

Principle #16Partial or excessive action

Solution Approach 2:

The system performs preliminary interference measurements and determines relationship information before critical handover events. By proactively measuring signal power and establishing frequency reuse modes in advance, the system prepares optimal frequency allocations for upcoming handovers, improving success rates while allowing measurements to be performed under more stable conditions.

Inventive Principle:

Principle #10Preliminary action

Data Source

PatentUS9585024B2System and method for self-organized inter-cell interference coordination

Publication Date: 2017.02.28 HONOR DEVICE CO LTD

AI summary

A system and method for self-organized inter-cell interference coordination are provided. A method for controller operations includes receiving signal power measurements at a controller, determining an interference level based on the signal power measurements, generating relationship information based on the interference level, and determining frequency reuse modes for communications controllers controlled by the controller based on the relationship information.