Uplink Precoder Linear Combination for Interference Mitigation

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Solution Overview

Problem

In wireless communication systems, uplink transmissions often suffer from strong interference between neighboring base stations, particularly at cell edges, which affects the performance of multimedia services and requires effective interference mitigation techniques.

Innovation Solution

A method and apparatus for generating a precoder by linearly combining a first precoding matrix that maximizes transmission power between a mobile station and a serving base station with a second precoding matrix that minimizes interference power between the mobile station and neighboring base stations, using precoding matrices and interference sensitivity levels to optimize signal transmission.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Power

If a single precoding matrix is used to maximize transmission power to the serving base station, then transmission power is improved, but interference to neighboring base stations increases

Engineering Contradiction:

Improvetransmission powerVSAvoidinterference to neighboring base stations

Core Design Contradiction:

PowerVSObject-affected harmful factors

Solution Approach 1:

The single precoding matrix is segmented into two distinct components: a first precoding matrix optimized for maximizing transmission power to the serving base station, and a second precoding matrix optimized for minimizing interference to neighboring base stations. These segmented components are then linearly combined to achieve both objectives simultaneously.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The invention changes the parameter structure from a single precoding matrix to a linear combination of two precoding matrices with different optimization objectives. By adjusting the combination coefficients, the system can dynamically balance between transmission power maximization and interference minimization, adapting to different channel conditions and interference scenarios.

Inventive Principle:

Principle #35Parameter changes

2Object-affected harmful factors

If interference mitigation techniques are applied to reduce interference to neighboring base stations, then interference is reduced, but transmission power to the serving base station decreases

Engineering Contradiction:

Improveinterference to neighboring base stationsVSAvoidtransmission power to serving base station

Core Design Contradiction:

Object-affected harmful factorsVSPower

Solution Approach 1:

The invention merges two previously separate objectives (maximizing transmission power and minimizing interference) into a unified precoding solution by linearly combining two precoding matrices. This merging allows the system to achieve both power maximization and interference mitigation simultaneously, rather than having to choose one objective over the other.

Inventive Principle:

Principle #5Merging (Combining)

Solution Approach 2:

By introducing a linear combination structure with adjustable coefficients, the system can dynamically adjust the balance between transmission power and interference mitigation. The parameter change from a single fixed precoding matrix to a flexible linear combination enables simultaneous optimization of both conflicting objectives.

Inventive Principle:

Principle #35Parameter changes

3Power

If traditional beamforming is used to improve signal directionality, then transmission gain is improved, but multi-base station interference is not effectively mitigated

Engineering Contradiction:

Improvetransmission gainVSAvoidmulti-base station interference

Core Design Contradiction:

PowerVSObject-affected harmful factors

Solution Approach 1:

The traditional single beamforming approach is segmented into two specialized beamforming components: one focused on maximizing signal gain toward the serving base station, and another focused on minimizing interference toward neighboring base stations. This segmentation allows each component to optimize for its specific objective without compromising the other.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The invention transforms the traditional single-parameter beamforming approach into a multi-parameter approach by using a linear combination of two precoding matrices. This parameter expansion enables the system to independently control transmission gain and interference mitigation, achieving both objectives simultaneously where traditional single-parameter beamforming could only optimize for one.

Inventive Principle:

Principle #35Parameter changes

Data Source

PatentUS8605803B2Methods and apparatus for reducing uplink multi-base station interference

Publication Date: 2013.12.10 IND TECH RES INST

AI summary

Method and apparatus for generating a precoder for uplink transmission from a mobile station. The method includes receiving information corresponding to a first precoding matrix and a second precoding matrix, and generating the precoder by linearly combining the first precoding matrix and the second precoding matrix. In the method, the first precoding matrix maximizes a transmission power between the mobile station and a serving base station, and the second precoding matrix minimizes an average interference value between the mobile station and at least two neighboring base stations.