In-Band Full-Duplex Transmission Control Under Self-Interference

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Solution Overview

Problem

In in-band full duplex communication, self-interference from transmitted signals to reception circuits within a communication device significantly degrades performance, limiting the achievement of high communication efficiency.

Innovation Solution

A communication device controls transmission power based on estimated reception quality and residual self-interference, using interference cancellation technology to manage self-interference and enhance reception characteristics.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Productivity

If in-band full duplex communication is implemented to improve frequency utilization efficiency, then communication performance should be improved, but self-interference from transmitted signals to reception circuits degrades performance

Engineering Contradiction:

Improvefrequency utilization efficiencyVSAvoidself-interference

Core Design Contradiction:

ProductivityVSObject-affected harmful factors

Solution Approach 1:

The patent applies interference cancellation technology to convert the harmful self-interference signal into a beneficial component. By estimating the self-interference signal characteristics and subtracting them from the received signal, the system transforms the harmful interference into an opportunity to demonstrate advanced signal processing capability, thereby achieving high-quality in-band full duplex communication

Inventive Principle:

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

Solution Approach 2:

The patent dynamically adjusts transmission power based on estimated reception quality and residual self-interference levels. By changing the transmission power parameter adaptively, the system optimizes the balance between maintaining communication performance and managing self-interference, enabling effective in-band full duplex operation

Inventive Principle:

Principle #35Parameter changes

2Reliability

If transmission power is increased to improve communication signal quality, then reception quality should be improved, but self-interference increases and degrades performance

Engineering Contradiction:

Improvereception qualityVSAvoidself-interference

Core Design Contradiction:

ReliabilityVSObject-generated harmful factors

Solution Approach 1:

The patent implements a feedback mechanism where the communication device estimates its own reception quality and residual self-interference levels, then uses this information to adjust transmission power. This closed-loop feedback system enables dynamic optimization of transmission power to maintain reception quality while minimizing self-interference impact

Inventive Principle:

Principle #23Feedback

Solution Approach 2:

The patent employs dynamic transmission power adjustment rather than fixed power levels. By continuously adapting transmission power based on real-time estimates of reception quality and self-interference, the system achieves flexible optimization that responds to changing channel conditions and interference levels

Inventive Principle:

Principle #15Dynamics

Data Source

PatentEP3975604B1Communication device, information processing device, communication method, and information processing method

Publication Date: 2026.03.25 SONY GROUP CORP

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AI summary

A communication device includes: a communication unit that is allowed to simultaneously perform data transmission and data reception by using a same band; an acquisition unit that acquires information regarding self-interference generated at a time when the data transmission and the data reception are simultaneously performed by using the same band; and a communication control unit that performs control regarding the data transmission based on information regarding the self-interference or information from another device generated based on the information regarding the self-interference.