Filter Reuse Method for Inter-Cell Interference in 5G Networks

Resolve Bottlenecks,
Find Innovative SolutionsGenerate Solutions

Solution Overview

Problem

Current mobile communication systems face challenges in minimizing inter-cell interference, especially in heterogeneous networks, where macro and small cells coexist, and existing techniques like frequency reuse and enhanced Inter-Cell Interference Coordination with Almost Blank Subframes are inefficient in controlling interference.

Innovation Solution

The implementation of a filter reuse method in base stations that allocates non-orthogonal filters to cell center terminals and orthogonal filters to cell edge terminals, using a prototype filter unit for filtering signals, and a controller to select the appropriate filters based on terminal location for effective interference minimization.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Object-affected harmful factors

If frequency reuse technique is used to reduce inter-cell interference, then interference between cells is reduced, but it fails to suppress interference between uplink signals from terminals in neighboring cells and is ineffective in heterogeneous networks

Engineering Contradiction:

Improveinter-cell interferenceVSAvoideffectiveness in heterogeneous networks

Core Design Contradiction:

Object-affected harmful factorsVSAdaptability or versatility

Solution Approach 1:

The patent applies local quality by using different filter types (orthogonal vs. non-orthogonal) for different terminal locations (cell edge vs. cell center). Cell edge terminals use orthogonal filters to minimize inter-cell interference, while cell center terminals use non-orthogonal filters to maximize spectral efficiency. This location-based differentiation resolves the contradiction by making the interference mitigation technique adaptive to local network conditions.

Inventive Principle:

Principle #3Local quality

Solution Approach 2:

The patent changes the filter orthogonality parameter based on terminal location and network conditions. By dynamically selecting between orthogonal and non-orthogonal filters, the system adapts to heterogeneous network environments where macro and small cells coexist, thereby resolving the limitation of traditional frequency reuse techniques that cannot adapt to different network scenarios.

Inventive Principle:

Principle #35Parameter changes

2Object-affected harmful factors

If orthogonal filters are used for all terminals to minimize interference, then inter-cell interference is reduced, but spectral efficiency and data transmission rates decrease

Engineering Contradiction:

Improveinter-cell interferenceVSAvoiddata transmission rate

Core Design Contradiction:

Object-affected harmful factorsVSProductivity

Solution Approach 1:

Inventive Principle:

Principle #3Local quality

Solution Approach 2:

The patent applies orthogonal filtering only partially - specifically to cell edge terminals where inter-cell interference is most problematic - rather than to all terminals. This partial application of orthogonal filters achieves sufficient interference mitigation while preserving spectral efficiency for cell center terminals, thereby resolving the contradiction between interference reduction and data transmission rate.

Inventive Principle:

Principle #16Partial or excessive action

3Productivity

If non-orthogonal filters are used for all terminals to maximize spectral efficiency, then data transmission rates increase, but inter-cell interference increases significantly

Engineering Contradiction:

Improvedata transmission rateVSAvoidinter-cell interference

Core Design Contradiction:

ProductivityVSObject-affected harmful factors

Solution Approach 1:

Inventive Principle:

Principle #3Local quality

Solution Approach 2:

Inventive Principle:

Principle #16Partial or excessive action

4Object-affected harmful factors

If enhanced Inter-Cell Interference Coordination with Almost Blank Subframes is used, then some inter-cell interference is reduced, but scheduling complexity increases and control becomes more difficult in heterogeneous networks

Engineering Contradiction:

Improveinter-cell interferenceVSAvoidscheduling complexity

Core Design Contradiction:

Object-affected harmful factorsVSDevice complexity

Solution Approach 1:

Inventive Principle:

Principle #35Parameter changes

Solution Approach 2:

The patent enables terminals to self-identify their location (cell center or cell edge) and select the appropriate filter type, reducing the need for complex base station scheduling and control. This self-service approach simplifies the overall system complexity while maintaining effective interference mitigation.

Inventive Principle:

Principle #25Self-service

Data Source

PatentUS10425701B2Filter reuse method for transmitting and receiving filter bank-based multicarrier signals

Publication Date: 2019.09.24 SAMSUNG ELECTRONICS CO LTD

AI summary

The present disclosure relates to a 5G or pre-5G communication system for supporting a higher data transmission rate after 4G communication systems such as LTE. A method according to an embodiment of the present invention is a communication method in a base station which communicates via filter bank-based multicarrier signals. The method may comprise the steps of: performing communication by allocating filters having non-orthogonality with respect to a first terminal positioned within a cell; selecting a filter set from among two or more filter sets having orthogonality with respect to a second terminal positioned at the edge of the cell; and performing communication by allocating, to the second terminal, at least one filter among filters included in the selected filter set.