Fractional Time Reuse SON for Interference Management

Resolve Bottlenecks,
Find Innovative SolutionsGenerate Solutions

Solution Overview

Problem

Conventional wireless network deployments face capacity constraints and intercell interference issues, especially with the increasing demand for faster data services in 3.5G and 4G networks, where self-organizing networks (SON) are insufficient to coordinate densely deployed small cells effectively.

Innovation Solution

The implementation of a Fractional Time Reuse (FTR) SON system that coordinates network elements in groups by staggering Transmission Time Intervals (TTIs) for user equipment at the edge of cells, reducing intercell interference and optimizing network performance.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Productivity

If densely deployed small cells are used to increase network capacity, then network capacity and throughput are improved, but intercell interference increases and coordination complexity increases

Engineering Contradiction:

Improvenetwork capacityVSAvoidintercell interference

Core Design Contradiction:

ProductivityVSObject-affected harmful factors

Solution Approach 1:

The patent implements Fractional Time Reuse (FTR) by dividing time into periodic frames and allocating different resource blocks to different cells in a periodic manner. This periodic time-division multiplexing approach allows neighboring cells to transmit in different time slots, reducing intercell interference while maintaining high network capacity through dense small cell deployment

Inventive Principle:

Principle #19Periodic action

Solution Approach 2:

The patent segments the time resource into multiple frames and further segments each frame into different resource blocks. By dividing the time domain into discrete periodic intervals and assigning different segments to different cells, the system achieves both high capacity utilization and interference management through structured resource allocation

Inventive Principle:

Principle #1Segmentation

2Extent of automation

If conventional SON is used for small cell deployment, then automation is improved, but coordination capability among neighboring cells is insufficient

Engineering Contradiction:

Improveself-configuration capabilityVSAvoidcoordination performance

Core Design Contradiction:

Extent of automationVSReliability

Solution Approach 1:

The patent introduces a coordination entity that acts as an intermediary to manage resource allocation across neighboring cells. This intermediary coordinates the FTR resource block assignments among multiple cells, ensuring proper time-division multiplexing and interference management while maintaining automated operation through centralized coordination logic

Inventive Principle:

Principle #24Intermediary (Mediator)

Data Source

PatentUS9848343B2Method and system architecture for a self organizing network

Publication Date: 2017.12.19 AIRHOP COMMUNICATIONS INC

AI summary

A method and system architecture for a self-organizing network (SON) includes a first cell having a first user equipment classifier for determining one of cell edge and cell central. The SON also includes a second cell having a second user equipment classifier for determining one of cell edge and cell central. The system architecture and method provide a first transmit time interval (TTI) schema for user equipment within the area of coverage associated with the first cell and a TTI schema for user equipment within the area of coverage associated with the second cell, the second TTI schema differing from the first TTI schema. The user equipment is classified as cell center or cell edge in dependence upon at least one of QoS requirement, geometry, periodic PSMM and CQI reports. The TTI schemas are used for “cell edge” user equipment by the respective cells.