Precoding Method for Interference Alignment in Multi-Cell Networks

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Solution Overview

Problem

In communication systems, terminal devices at cell edges experience interference from neighboring base stations and intra-cell interference, leading to decreased data rates and inefficient use of radio resources due to inter-cell and intra-cell interference.

Innovation Solution

A precoding method that aligns interference channels of terminal devices in the cell edge region of an interference base station and generates a reception beamforming vector for terminal devices in the cell edge region of a serving base station, using zero-forcing and interference alignment precoding vectors to reduce interference and enhance throughput.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Area of stationary object

If terminal devices at cell edges receive signals from multiple base stations, then coverage is improved, but inter-cell interference increases causing decreased data rates

Engineering Contradiction:

Improvecoverage areaVSAvoiddata rate

Core Design Contradiction:

Area of stationary objectVSProductivity

Solution Approach 1:

The patent segments the received signal into desired signal components and interference components from different base stations. By identifying and separating the interference channels from neighboring base stations, the system can apply targeted interference cancellation techniques to each segment, thereby maintaining coverage while improving data rates through selective interference removal.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The patent converts the harmful interference from neighboring base stations into useful information for interference cancellation. By deliberately receiving and analyzing the interference channels from adjacent base stations, the terminal device can generate interference cancellation signals that transform the harmful interference into a beneficial cancellation mechanism, thereby improving data rates without sacrificing coverage.

Inventive Principle:

Principle #22Blessing in disguise (Convert harm into benefit)

2Productivity

If multiple base stations transmit simultaneously to enhance system capacity, then radio resource utilization improves, but inter-cell and intra-cell interference increases

Engineering Contradiction:

Improvesystem capacityVSAvoidinter-cell interference

Core Design Contradiction:

ProductivityVSObject-affected harmful factors

Solution Approach 1:

The patent implements a feedback mechanism where the terminal device measures the interference channels from neighboring base stations and feeds back this information to the serving base station. This feedback enables the serving base station to adjust its transmission strategy, apply appropriate precoding, and coordinate with neighboring base stations to mitigate interference while maintaining high system capacity through efficient radio resource utilization.

Inventive Principle:

Principle #23Feedback

Solution Approach 2:

The patent performs preliminary interference channel measurement and estimation before actual data transmission. By pre-characterizing the interference channels from neighboring base stations, the system can prepare interference cancellation signals and coordination strategies in advance, enabling effective interference management that allows multiple base stations to transmit simultaneously at high capacity without being overwhelmed by interference.

Inventive Principle:

Principle #10Preliminary action

3Productivity

If terminal devices use all available radio resources for data transmission, then throughput is maximized, but interference from neighboring cells reduces effective utilization

Engineering Contradiction:

ImprovethroughputVSAvoidradio resource utilization efficiency

Core Design Contradiction:

ProductivityVSReliability

Solution Approach 1:

The patent transforms the problematic interference that reduces effective radio resource utilization into a measurable and cancellable component. By converting the harmful interference into identifiable interference channel information, the system can systematically cancel it out, thereby enabling terminal devices to use all available radio resources for data transmission with high throughput while maintaining reliable and efficient radio resource utilization.

Inventive Principle:

Principle #22Blessing in disguise (Convert harm into benefit)

Data Source

PatentUS9231795B2Communication apparatus and precoding method based on multiple cells and multiple users

Publication Date: 2016.01.05 SAMSUNG ELECTRONICS CO LTD

AI summary

Provided are a communication apparatus that may generate a precoding matrix including precoding vectors to cancel or align interference existing in a plurality of terminal devices based on location of the terminal devices, and a terminal device that may estimate a channel formed between the terminal device and the communication apparatus to cancel or align interference signals.