DMRS Type Selection for Flexible Wireless Terminal Configuration

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Solution Overview

Problem

Existing radio communication systems face challenges in appropriately controlling DMRS configuration when supporting new DMRS ports and multiple DMRS types, which can lead to deteriorated communication throughput and quality.

Innovation Solution

A terminal and base station are equipped with a receiving section to handle higher layer parameters for DMRS configuration, including enhanced DMRS types and enabling/disabling options, allowing for appropriate DMRS type selection and application.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Adaptability or versatility

If the number of DMRS ports and DMRS types are increased to support future radio communication systems, then the communication capacity and flexibility are improved, but the complexity of DMRS configuration control increases

Engineering Contradiction:

ImproveDMRS configuration flexibilityVSAvoidDMRS configuration control complexity

Core Design Contradiction:

Adaptability or versatilityVSDevice complexity

Solution Approach 1:

The DMRS configuration is segmented into multiple independent parameters: dmrs-Type (indicating first or second type), dmrs-AdditionalPosition (indicating additional DMRS positions), and maxLength (indicating short or long DMRS). This segmentation allows each parameter to be controlled independently, managing the complexity of configuring multiple DMRS ports and types while maintaining flexibility.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The patent implements dynamic DMRS configuration where the terminal adapts DMRS parameters based on communication conditions. The base station configures DMRS parameters dynamically through RRC signaling, allowing the system to adjust DMRS type, additional positions, and length according to channel conditions and service requirements, thus maintaining flexibility while managing complexity through adaptive control.

Inventive Principle:

Principle #15Dynamics

2Productivity

If multiple DMRS types and enhanced DMRS are supported, then the communication throughput is improved, but the risk of configuration errors and communication quality deterioration increases

Engineering Contradiction:

Improvecommunication throughputVSAvoidcommunication quality stability

Core Design Contradiction:

ProductivityVSReliability

Solution Approach 1:

The patent implements feedback mechanisms where the terminal reports DMRS configuration status and channel conditions to the base station. The base station uses this feedback to adjust DMRS configuration parameters, ensuring optimal throughput while maintaining communication quality. The feedback loop helps detect and correct configuration errors, preventing quality deterioration.

Inventive Principle:

Principle #23Feedback

Solution Approach 2:

The patent controls communication quality by dynamically changing DMRS parameters (type, additional positions, length) based on channel conditions and service requirements. This parameter adjustment allows the system to optimize throughput for different scenarios while maintaining stability through controlled transitions between configuration states, preventing quality deterioration.

Inventive Principle:

Principle #35Parameter changes

3Adaptability or versatility

If DMRS configuration parameters are extensively configured to support new DMRS ports, then the adaptability is improved, but the signaling overhead increases

Engineering Contradiction:

ImproveDMRS port compatibilityVSAvoidsignaling overhead

Core Design Contradiction:

Adaptability or versatilityVSLoss of information

Solution Approach 1:

The patent uses universal RRC signaling parameters (dmrs-Type, dmrs-AdditionalPosition, maxLength) that serve multiple functions: they configure DMRS type, positions, and length simultaneously, and they are applicable across different DMRS port configurations. This multi-functionality reduces signaling overhead while maintaining compatibility with new DMRS ports and types.

Inventive Principle:

Principle #6Universality (Multi-functionality)

Solution Approach 2:

The base station performs preliminary configuration of DMRS parameters through RRC signaling before actual data transmission. This preliminary action establishes the DMRS configuration framework in advance, allowing the terminal to efficiently process and apply the configuration without requiring extensive real-time signaling, thus reducing overall signaling overhead while maintaining adaptability.

Inventive Principle:

Principle #10Preliminary action

Data Source

PatentEP4712419A1Terminal, wireless communication method, and base station

Publication Date: 2026.03.18 NTT DOCOMO INC

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AI summary

A terminal according to one aspect of the present disclosure includes a receiving section that receives a higher layer parameter related to DMRS configuration capable of including a DMRS enhanced type field for indicating one DMRS type selected from some types of a demodulation reference signal (DMRS) and a plurality of types of an enhanced DMRS or for indicating enabling of the enhanced DMRS, and a control section that judges, based on at least one of content of indication of the DMRS enhanced type field and presence or absence of the DMRS enhanced type field, a DMRS type to be applied.