Dynamic DMRS Configuration for Secondary Cell Throughput

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Solution Overview

Problem

Existing 5G cellular communication systems face inefficiencies in data throughput and resource wastage due to static configuration of additional demodulation reference signals (DMRS) for secondary cells, leading to poor channel conditions and high block error rates, especially in scenarios like high-speed mobility and cell edge locations.

Innovation Solution

Implementing dynamic configuration of DMRS positions using Medium Access Control Control Element (MAC-CE) messages to adapt DMRS configurations based on channel quality indicators (CQI) and block error rates (BLER), allowing for real-time adjustments to improve data throughput and reduce resource wastage.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Measurement precision

If additional demodulation reference signals are configured for secondary cells, then channel estimation accuracy is improved, but data throughput decreases due to increased resource overhead

Engineering Contradiction:

Improvechannel estimation accuracyVSAvoiddata throughput

Core Design Contradiction:

Measurement precisionVSProductivity

Solution Approach 1:

The patent implements dynamic configuration of additional DMRS positions by sending MAC-CE messages to activate or deactivate additional DMRS based on current channel conditions. This allows the system to switch between different DMRS configurations (first number of positions vs. second number of positions) rather than using a static configuration, thereby adapting to varying channel quality indicators and block error rates in real-time.

Inventive Principle:

Principle #15Dynamics

Solution Approach 2:

The system changes the parameter of DMRS positions by modifying the first number of demodulation reference signal positions to a second number of demodulation reference signal positions through MAC-CE messages. This parameter change is triggered based on channel quality indicators and block error rates, allowing optimization of channel estimation accuracy while managing resource overhead dynamically.

Inventive Principle:

Principle #35Parameter changes

2Device complexity

If static configuration of DMRS is used, then device complexity is reduced, but adaptability to varying channel conditions deteriorates

Engineering Contradiction:

Improveconfiguration complexityVSAvoidadaptability to channel conditions

Core Design Contradiction:

Device complexityVSAdaptability or versatility

Solution Approach 1:

The patent transforms the static DMRS configuration into a dynamic one by introducing MAC-CE messages that can activate or deactivate additional DMRS positions. This allows the configuration to adapt to varying channel conditions (such as high-speed mobility and cell edge locations) while maintaining a relatively simple base configuration structure.

Inventive Principle:

Principle #15Dynamics

Solution Approach 2:

The system enables self-service by automatically adjusting DMRS configuration based on channel quality indicators and block error rates without requiring manual reconfiguration. The network can dynamically determine when to activate additional DMRS positions and send appropriate MAC-CE messages, allowing the system to self-adapt to changing channel conditions.

Inventive Principle:

Principle #25Self-service

3Reliability

If additional DMRS positions are activated, then block error rate decreases, but resource overhead increases

Engineering Contradiction:

Improveblock error rateVSAvoidresource overhead

Core Design Contradiction:

ReliabilityVSLoss of substance

Solution Approach 1:

The system dynamically changes the parameter of DMRS positions from a first number to a second number based on observed block error rates and channel quality. When block error rates are high, additional DMRS positions are activated to improve reliability; when conditions are good, the configuration is optimized to reduce resource overhead.

Inventive Principle:

Principle #35Parameter changes

Solution Approach 2:

The patent implements feedback mechanisms where the system monitors channel quality indicators and block error rates, then uses this feedback to determine whether to activate or deactivate additional DMRS positions. This closed-loop approach ensures that resource overhead is optimized while maintaining acceptable block error rates.

Inventive Principle:

Principle #23Feedback

Data Source

PatentUS12537642B2Dynamic additional demodulation reference signal configuration

Publication Date: 2026.01.27 DELL PROD LP

AI summary

A system can configure a first number of demodulation reference signal (DMRS) positions as part of a connection setup with a user equipment that is configured to facilitate broadband cellular communications. The system can, after attaching the user equipment, send, to the user equipment, a first medium access control control element (MAC-CE) message indicative of modifying the first number of DMRS positions to a second number of DMRS positions for a primary cell. The system can, in response to determining that a secondary cell is activated with respect to the user equipment, send, to the user equipment, a second MAC-CE message indicative of modifying the first number of DMRS positions to the second number of demodulation reference signal positions for the secondary cell. The system can communicate with the user equipment according to the second number of DMRS positions.