Dynamic DMRS Switching for Multi-UE Channel Estimation

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Solution Overview

Problem

Existing wireless communication networks face challenges in dynamically adapting the number of DMRS symbols due to non-flexible configurations, which hinder the utilization of AI/ML-based solutions and interrupt data transmission when UE velocity changes.

Innovation Solution

Dynamic switching of DMRS symbols is achieved through DCI or MAC CE, allowing for flexible adaptation of DMRS density and processing time based on UE capabilities and velocity, enabling efficient overhead management.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If RRC reconfiguration is used to configure different numbers of additional DMRS symbols, then the channel estimation performance is improved, but the data transmission is interrupted and the flexibility is reduced

Engineering Contradiction:

Improvechannel estimation performanceVSAvoidflexibility of DMRS configuration

Core Design Contradiction:

ReliabilityVSAdaptability or versatility

Solution Approach 1:

The patent applies dynamics by transitioning from static RRC reconfiguration to dynamic MAC CE-based configuration. The network can now dynamically adjust the number of additional DMRS symbols based on real-time UE velocity changes without interrupting data transmission, making the system adaptive to varying channel conditions while maintaining continuous communication.

Inventive Principle:

Principle #15Dynamics

Solution Approach 2:

The patent changes the parameter of DMRS configuration from fixed RRC-level settings to dynamically adjustable MAC CE-level parameters. This allows the number of additional DMRS symbols to be modified based on current channel conditions and UE velocity, optimizing channel estimation performance without requiring transmission interruption.

Inventive Principle:

Principle #35Parameter changes

2Reliability

If RRC reconfiguration is used to enable different numbers of additional DMRS symbols, then the channel estimation is improved, but the resources cannot be used to co-schedule other UEs

Engineering Contradiction:

Improvechannel estimationVSAvoidresource utilization for multi-UE scheduling

Core Design Contradiction:

ReliabilityVSProductivity

Solution Approach 1:

The patent enables dynamic resource allocation by allowing the network to adjust DMRS configuration on a per-UE basis through MAC CE signaling. This dynamic approach allows different UEs to be scheduled with different numbers of additional DMRS symbols according to their individual velocity and channel conditions, optimizing both channel estimation and resource utilization simultaneously.

Inventive Principle:

Principle #15Dynamics

Solution Approach 2:

The patent applies local quality by allowing each UE to have customized DMRS configuration based on its specific channel conditions and velocity. Instead of a uniform configuration for all UEs, the system can locally adjust the number of additional DMRS symbols for each scheduled UE, improving channel estimation where needed while maintaining resource efficiency for other UEs.

Inventive Principle:

Principle #3Local quality

3Adaptability or versatility

If dynamic indication of DMRS symbols is implemented, then the adaptability to UE velocity is improved, but the overhead for configuration increases

Engineering Contradiction:

Improveadaptability to UE velocityVSAvoidconfiguration overhead

Core Design Contradiction:

Adaptability or versatilityVSDevice complexity

Solution Approach 1:

The patent changes the configuration approach from detailed RRC reconfiguration to more compact MAC CE-based indication. This parameter change reduces the overhead required for dynamic DMRS configuration while maintaining the ability to adapt to different UE velocities and channel conditions efficiently.

Inventive Principle:

Principle #35Parameter changes

Data Source

PatentUS20260052048A1Dynamic Switching Between Different Number of Additional DMRS Symbols for PDSCH or PUSCH

Publication Date: 2026.02.19 TELEFONAKTIEBOLAGET LM ERICSSON (PUBL)

AI summary

The number of Demodulation Reference Signals (D.MRS) symbols (or DMRS density) for NR or 6G is dynamically adapted, using a list of configured candidate number of DMRS symbols (or DMRS density). Downlink Control Information (DCI) or Media Access Control (MAC) Control Elements (CE) are used to indicate one of the candidate numbers of DMRS symbols. Methods of adapting the D.MRS processing time for PDSCH scheduled with dynamic indication of number of D.MRS symbols are also disclosed.