Full-Duplex Network Interference Mitigation on Shared Channels

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Solution Overview

Problem

Full-duplex network entities experience interference from neighboring network entities operating in half-duplex mode, leading to coexistence interference, which existing technologies have not effectively addressed.

Innovation Solution

Implementing interference mitigation actions such as muting overlapping bandwidths, reducing transmission power, configuring larger guard bands, and indicating high-priority traffic patterns to neighboring entities to suppress interference.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Productivity

If full-duplex network entities operate concurrently with half-duplex network entities using overlapping or adjacent frequency channels, then spectral efficiency and resource utilization are improved, but coexistence interference between the two types of entities deteriorates

Engineering Contradiction:

Improvespectral efficiencyVSAvoidcoexistence interference

Core Design Contradiction:

ProductivityVSObject-affected harmful factors

Solution Approach 1:

The patent applies preliminary anti-action by having full-duplex network entities proactively transmit interference mitigation requests to half-duplex entities before interference occurs. The request includes time interval information and frequency range specifications, enabling the half-duplex entity to preemptively adjust its transmission schedule and avoid overlapping with full-duplex operations, thus preventing coexistence interference while maintaining spectral efficiency

Inventive Principle:

Principle #9Preliminary anti-action

Solution Approach 2:

The patent implements preliminary action by configuring half-duplex network entities with advance notice of full-duplex transmission schedules. The full-duplex entity provides time interval and frequency range information in advance, allowing the half-duplex entity to pre-arrange its transmissions to avoid interference, thereby enabling both entities to operate efficiently without conflict

Inventive Principle:

Principle #10Preliminary action

2Object-affected harmful factors

If interference mitigation actions are implemented such as muting overlapping bandwidths or reducing transmission power, then coexistence interference is reduced, but transmission capacity and signal strength deteriorate

Engineering Contradiction:

Improvecoexistence interferenceVSAvoidtransmission power

Core Design Contradiction:

Object-affected harmful factorsVSPower

Solution Approach 1:

The patent applies local quality by implementing interference mitigation only in specific local contexts rather than globally. The full-duplex entity specifies exact time intervals and frequency ranges in its interference mitigation requests, allowing the half-duplex entity to adjust transmission power or mute only during those specific overlapping periods and frequency bands, while maintaining full transmission power and capacity during non-overlapping times

Inventive Principle:

Principle #3Local quality

Solution Approach 2:

The patent implements partial action by applying interference mitigation measures selectively rather than continuously. The half-duplex entity mutes or reduces power only for the specific time intervals and frequency ranges where interference would occur, while maintaining normal transmission during other periods, thus minimizing the impact on overall transmission capacity

Inventive Principle:

Principle #16Partial or excessive action

3Reliability

If signaling is transmitted to indicate high-priority traffic patterns and interference mitigation requests, then communication quality for full-duplex entities is improved, but signaling overhead and system complexity increase

Engineering Contradiction:

Improvecommunication qualityVSAvoidsignaling overhead

Core Design Contradiction:

ReliabilityVSDevice complexity

Solution Approach 1:

The patent applies the intermediary principle by using a standardized interference mitigation request message as a mediator between full-duplex and half-duplex entities. This structured message format, containing time interval information, frequency range specifications, and priority indicators, enables reliable communication of interference mitigation requirements while maintaining manageable signaling overhead through efficient information encoding

Inventive Principle:

Principle #24Intermediary (Mediator)

Data Source

PatentUS12526832B2Interference mitigation for full-duplex network entity

Publication Date: 2026.01.13 QUALCOMM INC

AI summary

Methods, systems, and devices for wireless communication are described. Two network entities may experience coexistence interference due to operating on a same channel or adjacent channels based on at least one of the network entities operating in a full-duplex mode. A first network entity may indicate, to the half-duplex network entity, an interference mitigation action to be performed for a duration of transmission time intervals. The interference mitigation action may include adjusting the power of downlink communications from the one of the network entities which overlap in bandwidth with uplink communications at the full-duplex network entity, muting a subband for a downlink communication, or configuring a larger guard band between operating channels.