Shared DMRS for PDCCH and PDSCH Multiplexing

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Solution Overview

Problem

Current wireless communication systems face challenges in efficiently multiplexing Physical Downlink Control Channel (PDCCH) and Physical Downlink Shared Channel (PDSCH) transmissions, particularly in frequency range 2 (FR2) and higher frequency bands, where shared precoding and beamforming are not effectively utilized.

Innovation Solution

The implementation of a configured shared demodulation reference signal (DMRS) that is shared between PDCCH and PDSCH transmissions, allowing for blind channel estimation and enabling the reuse of channel estimation information for both control and data channels.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Measurement precision

If separate DMRS are used for PDCCH and PDSCH transmissions, then channel estimation can be performed independently for each channel, but resource overhead increases and multiplexing efficiency deteriorates

Engineering Contradiction:

Improvechannel estimation accuracyVSAvoidreference signal overhead

Core Design Contradiction:

Measurement precisionVSQuantity of substance

Solution Approach 1:

The patent combines separate DMRS resources for PDCCH and PDSCH into a shared DMRS structure. The network entity configures a single DMRS that serves both control and data channels, reducing total reference signal overhead while maintaining the ability to perform independent channel estimation for each channel through separate processing paths.

Inventive Principle:

Principle #5Merging (Combining)

Solution Approach 2:

The shared DMRS is designed to serve multiple functions simultaneously - it provides channel estimation for both PDCCH and PDSCH transmissions. This multi-functional reference signal structure allows the same physical resource to support both control plane and user plane channel estimation needs.

Inventive Principle:

Principle #6Universality (Multi-functionality)

2Adaptability or versatility

If shared precoding and beamforming are used for PDCCH and PDSCH, then resource allocation flexibility improves, but in high-frequency bands (FR2 and above) transmission reliability deteriorates due to path loss and blocking

Engineering Contradiction:

Improveresource allocation flexibilityVSAvoidtransmission reliability

Core Design Contradiction:

Adaptability or versatilityVSReliability

Solution Approach 1:

The patent segments the channel estimation process into separate processing paths for PDCCH and PDSCH even when using a shared DMRS. The receiving device performs independent channel estimation for control and data channels, allowing separate optimization of transmission parameters for each channel type while maintaining resource efficiency.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The system dynamically adjusts transmission parameters including DMRS configuration, channel estimation methods, and beamforming settings based on frequency band characteristics. In high-frequency bands, the system modifies parameters to compensate for increased path loss and blocking effects while maintaining resource allocation flexibility.

Inventive Principle:

Principle #35Parameter changes

3Measurement precision

If blind channel estimation is performed for each transmission separately, then channel-specific accuracy is maintained, but processing time increases and productivity decreases

Engineering Contradiction:

Improvechannel estimation accuracyVSAvoidtransmission processing speed

Core Design Contradiction:

Measurement precisionVSProductivity

Solution Approach 1:

The network entity pre-configures the shared DMRS structure and parameters before actual transmissions occur. The receiving device is pre-prepared with the DMRS configuration information, enabling faster processing during actual transmissions without sacrificing estimation accuracy.

Inventive Principle:

Principle #10Preliminary action

Solution Approach 2:

The shared DMRS enables continuous channel estimation across both PDCCH and PDSCH transmissions using a unified reference signal structure. This eliminates gaps and redundancies in the estimation process, maintaining continuous useful action for channel characterization.

Inventive Principle:

Principle #20Continuity of useful action

Data Source

PatentUS20250047440A1Shared demodulation reference signal for physical downlink control channel and physical downlink shared channel transmissions

Publication Date: 2025.02.06 QUALCOMM INC

AI summary

Systems and techniques are provided for wireless communications. A process can include receiving a configured shared demodulation reference signal (DMRS) and determining, based on the configured shared DMRS, blind channel estimation information. The process can include receiving, based on the blind channel estimation information, control information indicative of a scheduled downlink data transmission. The process can include receiving, based on the blind channel estimation information, the scheduled downlink data transmission, wherein the scheduled downlink data transmission is received based on the control information and using the blind channel estimation information corresponding to the configured shared DMRS.