SBFD Resource Pre-Emption and Uplink Cancellation for CLI Mitigation

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Solution Overview

Problem

Conventional mechanisms are inadequate in mitigating cross-link interference (CLI) in full-duplex wireless communication systems, as existing cancellation and pre-emption indications are not applicable to all channels and transmission types.

Innovation Solution

Implementing flexible cancellation and pre-emption indications tailored to specific communication schemes, such as sub-band full-duplex (SBFD), by configuring different muting patterns for uplink and downlink transmissions based on SBFD configurations, using DCI and UE-specific or group common signaling to reduce CLI.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If conventional cancellation and pre-emption indications are used in full-duplex systems, then some interference mitigation is achieved, but the mechanism is inadequate for all channels and transmission types

Engineering Contradiction:

Improveinterference mitigation effectivenessVSAvoidapplicability to all channels and transmission types

Core Design Contradiction:

ReliabilityVSAdaptability or versatility

Solution Approach 1:

The patent implements dynamic cancellation and pre-emption indications that can be flexibly configured for different channels and transmission types. The system dynamically adapts the muting patterns and resource allocations based on the specific channel characteristics and transmission requirements, making the interference mitigation mechanism versatile across all channels rather than static and channel-specific

Inventive Principle:

Principle #15Dynamics

Solution Approach 2:

The patent creates a universal interference mitigation framework that can be applied to multiple channels (PUCCH, PUSCH, PRACH, SRS, SSB, PBCH) and different transmission types simultaneously. The cancellation and pre-emption indications are designed to work across diverse communication scenarios, providing multi-functional interference management rather than channel-specific solutions

Inventive Principle:

Principle #6Universality (Multi-functionality)

2Object-affected harmful factors

If sub-band full-duplex configurations are implemented with flexible muting patterns, then cross-link interference is reduced, but system complexity increases

Engineering Contradiction:

Improvecross-link interferenceVSAvoidconfiguration and signaling complexity

Core Design Contradiction:

Object-affected harmful factorsVSDevice complexity

Solution Approach 1:

The patent divides the frequency spectrum into sub-bands and applies targeted muting patterns to specific sub-bands rather than entire bands. This segmentation allows interference mitigation to be applied selectively where needed, reducing overall interference while minimizing the complexity burden compared to system-wide muting configurations

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The patent applies different muting patterns and cancellation indications to different local regions (sub-bands, specific resources) based on where cross-link interference occurs. Rather than applying uniform complexity across the entire system, the local quality principle enables targeted interference management with optimized complexity distribution

Inventive Principle:

Principle #3Local quality

3Object-affected harmful factors

If downlink transmissions are pre-empted or uplink transmissions are cancelled to reduce CLI, then interference is mitigated, but resource utilization efficiency decreases

Engineering Contradiction:

Improvecross-link interferenceVSAvoidresource utilization efficiency

Core Design Contradiction:

Object-affected harmful factorsVSProductivity

Solution Approach 1:

The patent applies partial cancellation or pre-emption actions only to the extent necessary to mitigate cross-link interference. Rather than completely canceling or pre-empting entire transmissions, the system applies targeted partial actions to specific resources or time intervals where interference occurs, maintaining resource utilization efficiency while achieving interference mitigation

Inventive Principle:

Principle #16Partial or excessive action

Solution Approach 2:

The patent enables rapid application and removal of cancellation/pre-emption indications, allowing the system to quickly skip through interference-prone periods and resume normal transmissions. This rushing through approach minimizes the duration of resource underutilization while effectively mitigating interference during critical periods

Inventive Principle:

Principle #21Skipping (Rushing through)

Data Source

PatentUS12470358B2Downlink pre-emption and uplink cancellation for full-duplex systems

Publication Date: 2025.11.11 QUALCOMM INC

AI summary

Methods, systems, and devices for wireless communication are described. A user equipment (UE) may receive an indication of a sub-band full-duplex (SBFD) configuration of a cell serving the UE. The SBFD configuration may indicate a first set of resources for downlink communications and a second set of resources for uplink communications. The first set of resources and the second set of resources may include non-overlapping frequency resources in a same time interval. The UE may receive a control message that indicates a pre-emption of the first set of resources or a cancellation of the second set of resources. Accordingly, the UE may determine that downlink transmissions in at least a portion of the first set of resources are pre-empted or that uplink transmissions in at least a portion of the second set of resources are cancelled based on the control message and the SBFD configuration of the cell.