Downlink Control Information Interference Field for MUST

Resolve Bottlenecks,
Find Innovative SolutionsGenerate Solutions

Solution Overview

Problem

Current wireless communication systems, such as LTE, face challenges in efficiently providing control information for multi-user superposition transmission (MUST) due to interference signals, which affect modulation schemes and interference cancellation techniques, leading to reduced bandwidth efficiency and increased complexity.

Innovation Solution

A method and apparatus that include a user equipment (UE) with a wireless communication module and processor to receive downlink control information containing an interference signal-related field, indicating the presence or absence of interference and its modulation scheme, allowing for efficient interference cancellation and resource allocation in MUST transmission.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Device complexity

If control information for MUST transmission is provided without explicit interference signal indication, then device complexity is reduced, but bandwidth efficiency deteriorates due to inability to perform effective interference cancellation

Engineering Contradiction:

Improvecontrol information processing complexityVSAvoidbandwidth efficiency

Core Design Contradiction:

Device complexityVSProductivity

Solution Approach 1:

The patent extracts only the essential interference signal information (presence/absence and modulation scheme) from the complete interference description, placing this critical subset in a dedicated field in downlink control information. This allows the UE to perform interference cancellation without processing complete interference descriptions, resolving the contradiction between complexity and efficiency.

Inventive Principle:

Principle #2Taking out (Extraction)

Solution Approach 2:

The patent applies local quality by providing detailed interference information only where needed (in the interference signal-related field for MUST transmissions) while keeping other control information at standard levels. This targeted approach enables efficient interference cancellation without universally increasing control information complexity across all transmission types.

Inventive Principle:

Principle #3Local quality

2Measurement precision

If detailed interference signal information is provided in control information, then interference cancellation accuracy is improved, but control information overhead increases

Engineering Contradiction:

Improveinterference cancellation accuracyVSAvoidcontrol information overhead

Core Design Contradiction:

Measurement precisionVSLoss of information

Solution Approach 1:

The patent extracts only the most critical interference characteristics (presence/absence and modulation scheme) that are sufficient for effective interference cancellation, rather than transmitting complete interference descriptions. This selective extraction maintains cancellation accuracy while minimizing control information overhead.

Inventive Principle:

Principle #2Taking out (Extraction)

Solution Approach 2:

The patent applies partial action by providing only the necessary portion of interference information (presence and modulation scheme) rather than complete detailed descriptions. This partial information is sufficient for the UE to perform effective interference cancellation, avoiding the overhead of transmitting excessive detail.

Inventive Principle:

Principle #16Partial or excessive action

3Device complexity

If MUST transmission is implemented without interference signal indication, then device complexity is reduced, but system performance deteriorates due to reduced bandwidth efficiency

Engineering Contradiction:

Improvecontrol information structure complexityVSAvoidsystem bandwidth efficiency

Core Design Contradiction:

Device complexityVSProductivity

Solution Approach 1:

The patent extracts the essential interference signal characteristics needed for MUST transmission into a dedicated field in downlink control information. This allows the system to implement MUST with improved bandwidth efficiency through effective interference cancellation, while keeping the control information structure addition minimal and targeted.

Inventive Principle:

Principle #2Taking out (Extraction)

4Reliability

If complete interference description is transmitted in control information, then interference cancellation performance is improved, but control signaling overhead increases

Engineering Contradiction:

Improveinterference cancellation performanceVSAvoidcontrol signaling overhead

Core Design Contradiction:

ReliabilityVSLoss of information

Solution Approach 1:

The patent extracts only the critical interference signal elements (presence/absence and modulation scheme) required for effective interference cancellation, placing these in a dedicated field in downlink control information. This extraction maintains reliable interference cancellation performance while minimizing control signaling overhead by excluding unnecessary detailed information.

Inventive Principle:

Principle #2Taking out (Extraction)

Data Source

PatentUS10993214B2Method for providing control information for must transmission in wireless communication system, and apparatus therefor

Publication Date: 2021.04.27 LG ELECTRONICS INC

AI summary

Disclosed is a method for receiving a downlink data signal from an eNode B by a user equipment in a wireless communication system. Specifically, the method comprises the steps of: receiving downlink control information including an interface signal-related field; and receiving the downlink data signal using the downlink control information, wherein the interference signal-related field indicates whether an interference signal exists, and further indicates a modulation scheme applied to the interference signal when the interference signal exists.