Interference Replica Signal Superposition for CoMP Resource Efficiency

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Solution Overview

Problem

Current CoMP schemes, such as JT-CoMP, DPS-CoMP, and CS-CoMP, face inefficiencies in radio resource utilization, while CB-CoMP is costly due to the need for multiple antennas, and there is a lack of effective evaluation methods for interference cancellation in coordinated interference cancellation schemes.

Innovation Solution

A mobile communication system that includes a base station capable of superposing an interference replica signal on a desired wave signal to cancel interference, with a user terminal measuring received power and notifying the base station to evaluate the interference cancellation effect, allowing for improved radio resource efficiency and reduced costs by eliminating the need for multiple antennas.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If JT-CoMP, DPS-CoMP, or CS-CoMP is used, then coordination between multiple points is achieved, but radio resource use efficiency is reduced because each point consumes radio resources for one user terminal

Engineering Contradiction:

Improvecoordination effectivenessVSAvoidradio resource use efficiency

Core Design Contradiction:

ReliabilityVSProductivity

Solution Approach 1:

The invention creates a replica of the interference signal (interference replica signal) and transmits it from the serving base station to cancel the interference. Instead of requiring coordinated transmission from multiple base stations, the serving base station alone generates and transmits the interference replica, thereby maintaining coordination effectiveness while improving radio resource efficiency.

Inventive Principle:

Principle #26Copying

2Productivity

If CB-CoMP is used, then radio resource use efficiency is maintained, but device cost and installation cost increase because each point needs to have a plurality of antennas

Engineering Contradiction:

Improveradio resource use efficiencyVSAvoidantenna configuration

Core Design Contradiction:

ProductivityVSDevice complexity

Solution Approach 1:

The invention extracts only the necessary interference cancellation function from the complex multi-antenna CB-CoMP system. By generating and transmitting an interference replica signal using the existing antenna configuration at the serving base station, the system achieves interference cancellation without requiring additional antennas or complex multi-point coordination infrastructure.

Inventive Principle:

Principle #2Taking out (Extraction)

3Object-affected harmful factors

If coordinated interference cancellation is implemented, then interference wave signal is canceled, but the ability to evaluate the cancellation effect is insufficient

Engineering Contradiction:

Improveinterference wave signalVSAvoidcancellation effect evaluation

Core Design Contradiction:

Object-affected harmful factorsVSMeasurement precision

Solution Approach 1:

The invention implements a feedback mechanism where the user terminal measures the received power of the reference signal after interference replica transmission and reports it to the base station. The base station uses this feedback information to evaluate the interference cancellation effect, thereby enabling precise measurement and assessment of the cancellation performance.

Inventive Principle:

Principle #23Feedback

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

Enhances radio resource efficiency by effectively canceling interference and reducing the need for costly antenna installations, while providing a method to evaluate the interference cancellation effect, thereby improving communication quality and reducing costs.

Implementation Method 1

a base station-side control unit configured to superpose an interference replica signal corresponding to the interference wave signal on the desired wave signal so as to cancel the interference wave signal received by the user terminal

Methodology Applied

Scientific EffectSignal superposition and interference cancellation: Interference

Data Source

PatentUS9692541B2Mobile communication system, communication control method, base station, user terminal and processor for canceling interference

Publication Date: 2017.06.27 KYOCERA CORP

AI summary

A mobile communication system comprises: a user terminal configured to receive a desired wave signal being a signal from a serving cell to the user terminal and an interference wave signal being a signal to another user terminal; and a base station configured to manage the serving cell. The base station includes a base station-side control unit configured to superpose an interference replica signal corresponding to the interference wave signal on the desired wave signal so as to cancel the interference wave signal received by the user terminal. The base station-side control unit is configured to transmit a predetermined signal corresponding to a first reference signal included in the interference wave signal. The user terminal includes a terminal-side control unit configured to derive first received power under a situation where the interference replica signal is superposed on the desired wave signal on the basis of at least one of the first reference signal and the predetermined signal.