Rank-Aware Interference Rejection via Neighbor Layer Notification

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Solution Overview

Problem

In wireless communication systems, interference between downlink transmissions from different base stations can occur when they use the same communication resources, leading to reduced communication reliability.

Innovation Solution

A user equipment (UE) determines if interference within a communication resource exceeds a threshold, and if so, requests notification from its serving network entity about the quantity of transmission layers scheduled by neighboring network entities. This information is used to update a rank-aware channel estimation algorithm, improving interference and noise covariance matrix estimation.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Productivity

If base stations allocate the same communication resources to multiple users, then resource utilization efficiency is improved, but interference between downlink transmissions increases

Engineering Contradiction:

Improveresource utilization efficiencyVSAvoidinterference between downlink transmissions

Core Design Contradiction:

ProductivityVSObject-affected harmful factors

Solution Approach 1:

The patent implements a feedback mechanism where the UE measures interference levels on allocated resources and reports this information back to the network. The network uses this feedback to identify interfering base stations and adjust resource allocation or transmission parameters, thereby resolving the contradiction between resource utilization and interference management through closed-loop control

Inventive Principle:

Principle #23Feedback

Solution Approach 2:

The patent introduces an intermediary information exchange mechanism where the UE acts as a mediator by measuring and reporting interference conditions to the serving base station, which then coordinates with other base stations to resolve conflicts. This intermediary approach enables collaborative interference management while maintaining efficient resource allocation

Inventive Principle:

Principle #24Intermediary (Mediator)

2Quantity of substance

If base stations use the same communication resources simultaneously, then system capacity is improved, but communication reliability deteriorates due to interference

Engineering Contradiction:

Improvesystem capacityVSAvoidcommunication reliability

Core Design Contradiction:

Quantity of substanceVSReliability

Solution Approach 1:

The system employs feedback loops where UEs continuously monitor communication quality and report interference metrics. This enables the network to dynamically adjust resource allocation and transmission parameters to maintain communication reliability while maximizing system capacity through efficient resource sharing

Inventive Principle:

Principle #23Feedback

Solution Approach 2:

The patent implements dynamic resource allocation and interference management where transmission parameters and resource assignments are continuously adjusted based on real-time channel conditions and interference measurements, allowing the system to adaptively balance capacity and reliability requirements

Inventive Principle:

Principle #15Dynamics

3Measurement precision

If the UE requests notification of transmission layers from neighbor network entities, then interference mitigation accuracy is improved, but signaling overhead increases

Engineering Contradiction:

Improveinterference mitigation accuracyVSAvoidsignaling overhead

Core Design Contradiction:

Measurement precisionVSLoss of information

Solution Approach 1:

The patent applies partial action by having the UE request transmission layer information only for specific neighbor cells that are identified as potential interferers, rather than all neighbor cells. This selective approach maintains interference mitigation accuracy while minimizing signaling overhead by focusing only on relevant entities

Inventive Principle:

Principle #16Partial or excessive action

Data Source

PatentUS20250151098A1Techniques for rank-aware interference rejection based on neighbor cell layer notification

Publication Date: 2025.05.08 QUALCOMM INC

AI summary

Methods, systems, and devices for wireless communication are described. A user equipment may transmit, to a serving network entity, a message requesting a quantity of transmission layers scheduled to be used by one or more neighbor network entities for communication within a communication resource. In response, the user equipment may receive, from the serving network entity, an indication of the quantity of transmission layers scheduled to be used by one or more neighbor network entities for communication within the communication resource. The user equipment may apply the quantity of transmission layers for the communication resource to a rank-aware interference rejection algorithm and may use the rank-aware interference rejection algorithm to improve a noise covariance matrix estimation. When receiving a downlink message, from the serving network entity via the communication resource, the improved noise covariance matrix estimation may be used to mitigate interference at the communication resource.