L1 Cross-Link Interference Measurement Reporting in Full-Duplex Wireless

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Solution Overview

Problem

Current wireless communication systems face challenges in effectively measuring and mitigating layer 1 cross-link interference (CLI) due to limitations in CLI measurement reporting, particularly in full-duplex (FD) deployments, where existing methods are slow and unsuitable for quick changes in channel conditions and interference.

Innovation Solution

Implementing a method for layer 1 (L1) CLI measurement reporting that allows user equipment (UE) to receive indications of L1 CLI measurement parameters from a base station, perform measurements, and transmit reports, enabling fast and unfiltered CLI measurement results for timely beam selection and interference mitigation, including aperiodic and semi-persistent reporting configurations.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Speed

If existing CLI measurement reporting methods are used, then measurement results are obtained, but the reporting speed is slow and cannot keep up with quick changes in channel conditions and interference

Engineering Contradiction:

ImproveCLI measurement reporting speedVSAvoidTime delay in CLI measurement reporting

Core Design Contradiction:

SpeedVSLoss of time

Solution Approach 1:

The patent implements dynamic CLI measurement reporting by allowing the UE to switch between periodic, aperiodic, and event-triggered reporting modes based on current channel conditions and interference levels. The base station can dynamically configure reporting parameters including timing, frequency, and content to match real-time network requirements, making the reporting system adaptive rather than static.

Inventive Principle:

Principle #15Dynamics

Solution Approach 2:

The patent changes multiple parameters of the CLI measurement reporting system including reporting period, bandwidth, power levels, and filtering coefficients. By adjusting these parameters dynamically, the system can optimize reporting speed and accuracy for different operational scenarios, transforming a rigid reporting mechanism into a flexible one that responds to changing conditions.

Inventive Principle:

Principle #35Parameter changes

2Stability of the object's composition

If filtered CLI measurement results are used, then measurement stability is improved, but the results do not reflect quick changes in interference conditions

Engineering Contradiction:

ImproveCLI measurement stabilityVSAvoidAdaptability to changing interference conditions

Core Design Contradiction:

Stability of the object's compositionVSAdaptability or versatility

Solution Approach 1:

The patent applies partial filtering by introducing a configurable filtering coefficient that ranges from 0 to 1. When the coefficient is 0, no filtering is applied and raw measurements are used, providing maximum responsiveness to changes. When the coefficient is 1, full filtering is applied for maximum stability. Intermediate values provide a balance, allowing the system to apply just enough filtering to stabilize measurements while preserving the ability to detect significant interference changes.

Inventive Principle:

Principle #16Partial or excessive action

Solution Approach 2:

The patent segments the filtering process into multiple stages with different coefficients applied to different measurement types or time periods. This allows simultaneous maintenance of both filtered (stable) and unfiltered (responsive) measurement streams, which can be used for different purposes such as long-term trend analysis versus immediate interference detection.

Inventive Principle:

Principle #1Segmentation

3Speed

If unfiltered CLI measurement results are used, then fast response to interference changes is achieved, but measurement accuracy and reliability are reduced

Engineering Contradiction:

ImproveResponse speed to interference changesVSAvoidCLI measurement reliability

Core Design Contradiction:

SpeedVSReliability

Solution Approach 1:

The patent implements dynamic selection of filtering intensity based on current operational conditions. The system can switch between filtered and unfiltered measurement modes, or adjust the filtering coefficient in real-time, allowing optimal balance between responsiveness and reliability for each specific scenario such as high mobility vs. stationary conditions.

Inventive Principle:

Principle #15Dynamics

4Adaptability or versatility

If aperiodic and semi-persistent reporting configurations are implemented, then reporting flexibility is improved, but system complexity increases

Engineering Contradiction:

ImproveReporting configuration flexibilityVSAvoidCLI measurement reporting system complexity

Core Design Contradiction:

Adaptability or versatilityVSDevice complexity

Solution Approach 1:

The patent designs a universal reporting framework that can handle periodic, aperiodic, and event-triggered reporting through a common set of configuration parameters and processing logic. This multi-functional design allows the same basic infrastructure to support multiple reporting modes, reducing the need for separate dedicated systems for each mode and thereby limiting the increase in complexity.

Inventive Principle:

Principle #6Universality (Multi-functionality)

Data Source

PatentUS20230156497A1Techniques for layer 1 cross-link interference measurement reporting

Publication Date: 2023.05.18 QUALCOMM INC

AI summary

Various aspects of the present disclosure generally relate to wireless communication. In some aspects, a user equipment (UE) may receive an indication of one or more layer 1 (L1) cross-link interference (CLI) measurement parameters. The UE may transmit an L1 CLI measurement report based at least in part on the one or more L1 CLI measurement parameters. Numerous other aspects are described.