Adaptive Transmission Configuration for Full-Duplex Self-Interference

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Solution Overview

Problem

Existing wireless communication systems face challenges in efficiently managing semi-persistent transmissions in full-duplex systems, particularly in determining optimal transmission configurations to minimize self-interference and maximize throughput.

Innovation Solution

The method involves determining whether a semi-persistent transmission overlaps in the time domain with a dynamic transmission, and based on this determination, selecting either a full-duplex or half-duplex configuration for the semi-persistent transmission to mitigate self-interference and optimize communication.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Productivity

If full-duplex transmission is used for semi-persistent transmissions, then spectral efficiency is improved, but self-interference increases

Engineering Contradiction:
Improvespectral efficiencyVSAvoidself-interference
Core Design Contradiction:
ProductivityVSObject-generated harmful factors

Solution Approach 1:

The patent applies dynamics by making the transmission configuration adaptive rather than fixed. The device dynamically switches between full-duplex and half-duplex modes based on real-time detection of overlapping transmissions. When overlap is detected, the system transitions from full-duplex (for maximum spectral efficiency) to half-duplex (for self-interference avoidance), and vice versa when no overlap occurs. This dynamic adaptation resolves the contradiction by allowing full-duplex operation only when beneficial.

Inventive Principle:
Principle #15Dynamics

Solution Approach 2:

The patent implements feedback mechanisms where the device continuously monitors transmission schedules and detects overlaps between semi-persistent and dynamic transmissions. Based on this feedback information, the device adjusts its transmission configuration. The feedback loop enables the system to learn from current transmission conditions and modify its behavior accordingly, switching between full-duplex and half-duplex modes to optimize the balance between spectral efficiency and self-interference.

Inventive Principle:
Principle #23Feedback

2Device complexity

If transmission configuration is fixed, then device complexity is reduced, but adaptability to overlapping transmissions deteriorates

Engineering Contradiction:
Improveconfiguration managementVSAvoidtransmission mode flexibility
Core Design Contradiction:
Device complexityVSAdaptability or versatility

Solution Approach 1:

The patent transforms the transmission configuration from a fixed static parameter to a dynamic adaptive one. Instead of using a single predetermined configuration, the system maintains multiple configuration options (full-duplex and half-duplex) and selects the appropriate one based on real-time transmission conditions. This dynamic approach increases adaptability to overlapping transmissions while managing complexity through automated decision-making based on detected transmission schedules.

Inventive Principle:
Principle #15Dynamics

Solution Approach 2:

The patent applies parameter changes by modifying the transmission mode parameter based on detected conditions. The system changes the operational parameter (full-duplex vs. half-duplex) according to the presence or absence of overlapping transmissions. This parameter adaptation allows the device to handle various transmission scenarios flexibly, improving versatility without requiring overly complex manual configuration management.

Inventive Principle:
Principle #35Parameter changes

3Productivity

If semi-persistent transmission overlaps with dynamic transmission, then time utilization is improved, but self-interference increases

Engineering Contradiction:
Improvetime utilizationVSAvoidself-interference
Core Design Contradiction:
ProductivityVSObject-generated harmful factors

Solution Approach 1:

The patent resolves this contradiction through dynamic mode switching. When overlap is detected between semi-persistent and dynamic transmissions, the system dynamically adjusts its operation from full-duplex to half-duplex mode. This allows the system to maintain time utilization efficiency while avoiding self-interference during overlapping periods. The dynamic adaptation enables the device to maximize resource usage when safe and prevent interference when necessary.

Inventive Principle:
Principle #15Dynamics

Solution Approach 2:

The patent converts the potentially harmful overlap condition into a beneficial adaptive opportunity. Instead of treating overlap as a problem that must be avoided at all costs, the system detects the overlap condition and uses it to trigger a mode switch to half-duplex operation. This transforms the harmful self-interference potential into a controlled scenario where the system deliberately selects the appropriate transmission mode, turning what could be a harmful situation into a managed and optimized operation.

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

Data Source

PatentUS12289720B2Transmission configuration determination for grant-free transmissions in full-duplex systems
Publication Date: 2025.04.29 QUALCOMM INC
  • US12289720B2 patent drawing
  • US12289720B2 patent drawing
  • US12289720B2 patent drawing

AI summary

Methods, systems, and devices for wireless communications are described. Generally, the described techniques provide for adapting a configuration for transmitting or receiving a semi-persistent transmission to minimize self-interference when appropriate and maximize throughput. A first device and a second device may determine whether the semi-persistent transmission overlaps in a time domain with a dynamic transmission. If the semi-persistent transmission overlaps in the time domain with the dynamic transmission, the first device and the second device may use a full-duplex configuration to transmit or receive the semi-persistent transmission. Alternatively, if the semi-persistent transmission fails to overlap in a time domain with a dynamic transmission, the first device and the second device may use a half-duplex configuration to transmit or receive the semi-persistent transmission.