DMRS Bundling Support for Phase-Consistent Channel Estimation

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Solution Overview

Problem

Existing demodulation reference signal (DMRS) bundling techniques are ineffective if transmission parameters such as phase continuity and power consistency are not maintained, leading to poor channel estimation and communication failures, particularly in non-terrestrial networks with long transmission paths.

Innovation Solution

User equipment (UE) performs procedures to support DMRS bundling by maintaining phase continuity and power consistency, and optionally indicates this through implicit methods like DMRS port alternation, allowing base stations to synchronize and apply DMRS bundling without explicit signaling, thereby improving channel estimation and communication reliability.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Measurement precision

If DMRS bundling is applied across multiple communications, then channel estimation accuracy is improved, but channel consistency and phase continuity become difficult to maintain

Engineering Contradiction:

Improvechannel estimation accuracyVSAvoidchannel consistency

Core Design Contradiction:

Measurement precisionVSStability of the object's composition

Solution Approach 1:

The base station determines whether the UE supports DMRS bundling before applying the bundling across multiple communications. This preliminary determination ensures that channel consistency and phase continuity are maintained by only applying DMRS bundling when the UE is capable of supporting it, thereby resolving the contradiction between improving channel estimation accuracy and maintaining channel consistency.

Inventive Principle:

Principle #10Preliminary action

2Measurement precision

If separate indications are used for each communication to support DMRS bundling, then channel estimation accuracy is improved, but signaling overhead increases

Engineering Contradiction:

Improvechannel estimation accuracyVSAvoidsignaling overhead

Core Design Contradiction:

Measurement precisionVSLoss of information

Solution Approach 1:

The base station applies DMRS bundling across a set of multiple communications without requiring separate indications for each communication. The bundling is applied based on a determination made prior to the communications, merging the channel estimation process across multiple transmissions and thereby reducing signaling overhead while maintaining channel estimation accuracy.

Inventive Principle:

Principle #5Merging (Combining)

3Productivity

If DMRS bundling is applied without UE support indication, then resource efficiency is improved, but decoding reliability decreases

Engineering Contradiction:

Improveresource efficiencyVSAvoiddecoding reliability

Core Design Contradiction:

ProductivityVSReliability

Solution Approach 1:

The base station determines whether the UE supports DMRS bundling before applying it across multiple communications. This feedback mechanism ensures that DMRS bundling is only applied when the UE is capable of supporting it, thereby maintaining decoding reliability while improving resource efficiency by avoiding unnecessary separate indications for each communication.

Inventive Principle:

Principle #23Feedback

Data Source

PatentUS12615671B2Support for demodulation reference signal bundling by a base station

Publication Date: 2026.04.28 QUALCOMM INC

AI summary

Various aspects of the present disclosure generally relate to wireless communication. In some aspects, a user equipment (UE) may configure one or more transmission parameters to maintain a channel consistency for a transmission channel. The UE may transmit, via the transmission channel, a set of multiple communications using the one or more transmission parameters. Numerous other aspects are described.