Dynamic DMRS Pattern Configuration for 5G NR Channel Adaptation

Resolve Bottlenecks,
Find Innovative SolutionsGenerate Solutions

Solution Overview

Problem

In 5G NR systems, the conventional method for configuring demodulation reference signals (DMRS) results in high pilot overheads and inability to adapt to varying channel characteristics, as all time units are configured with the same total quantity of time domain symbols, leading to inaccurate channel estimation when channel quality is poor or excessive overhead when channel quality is good.

Innovation Solution

The method involves configuring DMRS patterns for multiple time units with different total quantities of time domain symbols, allowing for flexible configuration based on channel conditions, where more DMRSs are used in critical time units to ensure accurate channel estimation and reduce overhead by adjusting the density of DMRSs dynamically.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Adaptability or versatility

If the same total quantity of time domain symbols is configured for all time units, then the configuration is simple and uniform, but the pilot overhead is high and cannot adapt to varying channel conditions

Engineering Contradiction:

Improveadaptability to channel conditionsVSAvoidpilot overhead

Core Design Contradiction:

Adaptability or versatilityVSQuantity of substance

Solution Approach 1:

The patent applies dynamics by enabling the total quantity of time domain symbols for DMRS to be dynamically configured for each time unit based on channel conditions, rather than using a static uniform configuration. This allows the system to adapt DMRS density to varying channel characteristics across different time units, reducing overhead when channel conditions are good while maintaining sufficient pilot density when channel conditions are poor.

Inventive Principle:

Principle #15Dynamics

Solution Approach 2:

The patent implements local quality by allowing different time units to have different DMRS configurations tailored to their specific channel conditions. Each time unit can be independently configured with appropriate DMRS density, enabling localized optimization rather than applying a one-size-fits-all approach across all time units.

Inventive Principle:

Principle #3Local quality

2Measurement precision

If more DMRSs are configured for all time units, then channel estimation accuracy is improved, but pilot overhead increases

Engineering Contradiction:

Improvechannel estimation accuracyVSAvoidpilot overhead

Core Design Contradiction:

Measurement precisionVSQuantity of substance

Solution Approach 1:

The patent applies local quality by configuring different DMRS densities in different time units based on their specific channel conditions. Time units with poor channel conditions receive higher DMRS density for accurate channel estimation, while time units with good channel conditions use lower DMRS density to reduce overhead, thereby achieving precise channel estimation only where necessary.

Inventive Principle:

Principle #3Local quality

Solution Approach 2:

The patent implements parameter changes by dynamically adjusting the total quantity of time domain symbols for DMRS in each time unit. This parameter adjustment allows the system to optimize channel estimation accuracy by increasing DMRS density when needed while reducing overhead when channel conditions permit, rather than maintaining a fixed high density across all time units.

Inventive Principle:

Principle #35Parameter changes

3Quantity of substance

If fewer DMRSs are configured for all time units, then pilot overhead is reduced, but channel estimation accuracy deteriorates

Engineering Contradiction:

Improvepilot overheadVSAvoidchannel estimation accuracy

Core Design Contradiction:

Quantity of substanceVSMeasurement precision

Solution Approach 1:

The patent applies local quality by allowing different time units to have different DMRS configurations matched to their channel conditions. This ensures that channel estimation accuracy is maintained in time units with poor conditions while reducing overhead in time units with good conditions, rather than uniformly reducing DMRS density across all time units.

Inventive Principle:

Principle #3Local quality

Solution Approach 2:

The patent implements parameter changes by dynamically configuring the total quantity of time domain symbols for DMRS based on channel conditions. This allows the system to reduce pilot overhead by lowering DMRS density when channel conditions are good, while maintaining sufficient density for accurate estimation when conditions are poor, optimizing the trade-off between overhead and accuracy.

Inventive Principle:

Principle #35Parameter changes

Data Source

PatentUS12199903B2Method for obtaining configuration information of demodulation reference signal, configuration method, and apparatus

Publication Date: 2025.01.14 HUAWEI TECH CO LTD

AI summary

A method includes: receiving first signaling, wherein the first signaling comprises demodulation reference signal (DMRS) patterns configured for N time units, each DMRS pattern is used to indicate a quantity of DMRSs in each time unit, the quantity of DMRSs in each time unit is a total quantity of time domain symbols occupied by all DMRSs in the time unit, DMRSs configured for at least two of the N time units occupy different total quantities of time domain symbols, and N is a positive integer greater than 1; and receiving or sending data in the N time units based on the total quantity of time domain symbols occupied by all the DMRSs in each time unit.