Full-Duplex Wireless Node Interference Floor Adaptation

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Solution Overview

Problem

Current wireless radio access technologies (RATs) are limited by half-duplex operations, which reduce efficiency as they allow only one node to access the channel at a time, leading to inefficiencies in communication systems like WLANs.

Innovation Solution

Implementing full-duplex communications by using modulation and coding schemes (MCS) adjusted based on interference floors, allowing nodes to transmit and receive simultaneously while managing interference through advanced channel access mechanisms and energy detection techniques.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Productivity

If half-duplex communication is used, then channel access is simplified and interference is avoided, but communication efficiency and data transfer rates are reduced

Engineering Contradiction:

Improvecommunication efficiencyVSAvoidchannel access mechanism complexity

Core Design Contradiction:

ProductivityVSDevice complexity

Solution Approach 1:

The patent changes the operational parameter from half-duplex to full-duplex mode, enabling simultaneous transmission and reception. This is achieved by adjusting modulation and coding schemes (MCS) based on interference floor measurements, allowing the system to operate in full-duplex mode while managing self-interference through dynamic parameter adaptation.

Inventive Principle:

Principle #35Parameter changes

2Productivity

If full-duplex communication is implemented, then communication efficiency and data transfer rates improve, but interference management becomes more complex

Engineering Contradiction:

Improvedata transfer rateVSAvoidself-interference

Core Design Contradiction:

ProductivityVSObject-affected harmful factors

Solution Approach 1:

The patent implements a feedback mechanism where nodes measure the interference floor caused by their own transmissions and use this information to adjust modulation and coding schemes (MCS) for subsequent transmissions. This closed-loop feedback allows the system to adapt to interference conditions and maintain reliable communication in full-duplex mode.

Inventive Principle:

Principle #23Feedback

Solution Approach 2:

The system dynamically adjusts transmission parameters including MCS, power levels, and resource allocation based on real-time interference floor measurements. This dynamic adaptation enables the system to optimize performance under varying interference conditions while maintaining full-duplex operation.

Inventive Principle:

Principle #15Dynamics

3Reliability

If full-duplex communication is used, then network performance and simultaneous transmission capability improve, but interference floor and signal quality deteriorate

Engineering Contradiction:

Improvecommunication reliabilityVSAvoidinterference floor

Core Design Contradiction:

ReliabilityVSObject-affected harmful factors

Solution Approach 1:

The patent converts the harmful self-interference into useful information by measuring the interference floor and using it to optimize transmission parameters. The interference measurement, which would normally degrade signal quality, is instead utilized to select appropriate MCS and power levels, thereby improving overall communication reliability in full-duplex mode.

Inventive Principle:

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

Data Source

PatentUS11349631B2Techniques for providing full-duplex communications in wireless radio access technologies

Publication Date: 2022.05.31 QUALCOMM INC

AI summary

Aspects of the present disclosure relate to receiving, at a first node and from a second node configured for full-duplex wireless communications, a signal indicating an interference floor for receiving signals at the second node, wherein the interference floor is based on interference caused by a transmitter of the second node, determining, by the first node and based at least in part on the interference floor, a modulation and coding scheme (MCS) for transmitting one or more signals to the second node, and transmitting, by the first node and based on the MCS, the one or more signals to the second node.