Relay Node Cache Memory Interference Neutralization

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Solution Overview

Problem

In wireless communication systems, relay nodes face challenges in efficiently delivering content to user equipment (UE) while managing interference from adjacent cells, particularly at the cell edge, where inter-cell interference degrades signal quality and transmission efficiency.

Innovation Solution

The method involves using a caching memory in relay nodes to store both requested content and interfering content from neighboring cells, allowing the relay node to transmit the interfering content to the UE for cancellation, thereby enhancing signal quality and reducing interference through interference neutralization or successive interference cancellation schemes.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If relay node transmits content to UE, then content delivery is achieved, but inter-cell interference degrades signal quality

Engineering Contradiction:

Improvesignal qualityVSAvoidinter-cell interference

Core Design Contradiction:

ReliabilityVSObject-affected harmful factors

Solution Approach 1:

The relay node transmits the interfering content (which would normally be harmful) to the UE, enabling the UE to perform interference cancellation. By converting the harmful interference into a useful signal that helps the UE identify and cancel the interference, the system transforms the problem into a solution.

Inventive Principle:

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

Solution Approach 2:

The relay node acts as an intermediary between the interfering base station and the UE. It receives the interfering content from the neighbor cell and forwards it to the UE, enabling the UE to use this information for interference cancellation purposes.

Inventive Principle:

Principle #24Intermediary (Mediator)

2Reliability

If relay node stores both requested content and interfering content in caching memory, then interference cancellation capability is improved, but memory resource consumption increases

Engineering Contradiction:

Improveinterference cancellation capabilityVSAvoidmemory resource

Core Design Contradiction:

ReliabilityVSQuantity of substance

Solution Approach 1:

The relay node performs preliminary actions by storing the interfering content in advance in its caching memory, before the UE actually experiences the interference. This proactive storage enables the UE to perform interference cancellation when needed, without requiring real-time acquisition of the interfering signal characteristics.

Inventive Principle:

Principle #10Preliminary action

3Reliability

If UE receives interfering content from relay node, then interference cancellation is enabled, but transmission overhead increases

Engineering Contradiction:

Improveinterference cancellationVSAvoidtransmission overhead

Core Design Contradiction:

ReliabilityVSLoss of information

Solution Approach 1:

The interfering content that would normally represent wasted transmission resources is converted into a beneficial resource for interference cancellation. By transmitting the interfering signal to the UE, the system enables the UE to cancel interference from other sources, turning a potential waste into a useful function.

Inventive Principle:

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

Data Source

PatentUS10652149B2Method and device for transmitting/receiving data using cache memory in wireless communication system supporting relay node

Publication Date: 2020.05.12 LG ELECTRONICS INC

AI summary

The present invention relates to a wireless communication system. More particularly, the present invention relates to a method for transmitting a content using a cache memory, and a method for transmitting, by a relay node, a content using a cache memory according to the present invention may comprise the steps of: storing a first content, received from a serving cell, in the cache memory; storing a second content, received from an adjacent cell or the serving cell, in the cache memory; selecting a content to be transmitted to a user equipment (UE) from among the first content requested by the UE and the second content which acts as interference to the first content; and transmitting the second content to the UE.