Relay User Equipment Interference Control via D2D Coordination

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Solution Overview

Problem

In heterogeneous networks, the increasing inter-cell interference due to concentrated small cells leads to significant overhead in inter-cell coordination methods, necessitating a more efficient approach to reduce interference through device-to-device coordination without relying on inter-cell coordination.

Innovation Solution

A method for a user equipment to receive a coordinated signal via device-to-device direct communication, involving interference signal detection, feedback information transmission, and maximal ratio combining, with Successive Interference Cancellation (SIC) using an Amplify-and-forward relay protocol, and adaptive beamforming to optimize signal reception.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If inter-cell coordination methods are used to control interference, then interference control performance is improved, but system overhead increases significantly

Engineering Contradiction:

Improveinterference control performanceVSAvoidsystem overhead

Core Design Contradiction:

ReliabilityVSQuantity of substance

Solution Approach 1:

The patent introduces a relay user equipment as an intermediary node between the base station and terminal. The relay equipment receives coordinated signals from the base station and forwards them to the terminal, enabling interference control without requiring direct inter-cell coordination overhead. This mediator approach reduces the communication burden between base stations while maintaining interference control effectiveness.

Inventive Principle:

Principle #24Intermediary (Mediator)

Solution Approach 2:

The patent extracts the coordination function from the base station level and implements it at the terminal level through device-to-device communication. By taking out the coordination overhead from the network infrastructure and placing it at the edge (terminal), the system reduces overall overhead while maintaining interference control capabilities through local processing and feedback.

Inventive Principle:

Principle #2Taking out (Extraction)

2Quantity of substance

If device-to-device direct communication is used, then overhead is reduced, but interference management becomes more challenging

Engineering Contradiction:

ImproveoverheadVSAvoidinterference management complexity

Core Design Contradiction:

Quantity of substanceVSDevice complexity

Solution Approach 1:

The patent implements feedback mechanisms where the terminal detects interference signals and sends feedback information to the relay user equipment. The relay equipment then adjusts the coordinated signals based on this feedback, creating a closed-loop system that automatically manages interference without requiring complex centralized control. This feedback-driven approach simplifies interference management while maintaining low overhead.

Inventive Principle:

Principle #23Feedback

Solution Approach 2:

The terminal performs self-service interference management by detecting interference signals and generating feedback information autonomously. The relay user equipment also performs self-adjustment by modifying coordinated signals based on received feedback. This distributed self-service approach reduces the need for complex network-wide coordination while effectively managing interference at the local level.

Inventive Principle:

Principle #25Self-service

Applied Scientific Principles

This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.

Function Achieved in This Case

Effectively reduces interference and enhances signal reception for user equipment by leveraging device-to-device direct communication, improving network performance and capacity without the overhead of inter-cell coordination.

Implementation Method 1

device-to-device direct communication

Methodology Applied

Scientific EffectElectromagnetic radiation: Electromagnetic Induction

Implementation Method 2

detecting an interference signal component by performing first maximal ratio combining on the coordinated signal

Methodology Applied

Scientific EffectSignal combining:

Implementation Method 3

detecting a valid signal component by performing second maximal ratio combining

Methodology Applied

Scientific EffectSignal combining:

Data Source

PatentUS9819461B2Method for receiving coordinated signal on basis of terminal-to-terminal direct communication and apparatus therefor

Publication Date: 2017.11.14 LG ELECTRONICS INC

AI summary

Disclosed is a method for receiving a coordinated signal by a terminal on the basis of a terminal-to-terminal direct communication. Specifically, the method comprises the steps of: receiving a coordinated signal including an interference signal and a valid signal from a relay terminal; detecting an interference signal component by performing a first maximum-ratio combining on the coordinated signal; transmitting a first feedback information to the relay terminal if the detection of the interference signal component fails, and detecting a valid signal component by performing a second maximum-ratio combining if the detection of the interference signal component is successful; and transmitting a second feedback information to the relay terminal if the detection of the valid signal component fails.