Shared DMRS Power Scaling for Uniform PDSCH EPRE

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Solution Overview

Problem

In wireless communication systems, grouping multiple PDSCH communications within a shared FDRA results in varying transmit energy per resource element (EPRE) due to differing pathloss conditions among UEs, leading to non-uniform EPRE across the shared DMRS and degrading channel estimation and decoding performance.

Innovation Solution

Configuring a shared DMRS with a common energy per resource element (EPRE) for multiple PDSCH communications, and dynamically adjusting the traffic-to-pilot power ratio (TPR) based on pathloss conditions to ensure consistent EPRE across UEs.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Productivity

If multiple PDSCH communications are grouped within a shared FDRA, then resource utilization efficiency is improved, but EPRE uniformity across UEs deteriorates due to varying pathloss conditions

Engineering Contradiction:

Improveresource utilization efficiencyVSAvoidEPRE uniformity

Core Design Contradiction:

ProductivityVSManufacturing precision

Solution Approach 1:

The patent applies dynamics by making the TPR configurable and adjustable rather than fixed. The network node can dynamically select from multiple candidate TPR values or configure custom TPR values based on current pathloss conditions, allowing the system to adapt to changing channel conditions while maintaining uniform EPRE across UEs sharing the same FDRA

Inventive Principle:

Principle #15Dynamics

Solution Approach 2:

The patent changes the parameter of TPR from a fixed value to a configurable parameter with multiple candidate values. By allowing the network node to select different TPR values from a set of candidates or configure custom values, the system can compensate for varying pathloss conditions and maintain uniform EPRE while preserving the benefits of shared FDRA resource allocation

Inventive Principle:

Principle #35Parameter changes

2Device complexity

If a fixed TPR value is used for DMRS power scaling, then implementation complexity is reduced, but channel estimation performance deteriorates due to non-uniform EPRE across resource elements

Engineering Contradiction:

Improveimplementation complexityVSAvoidchannel estimation performance

Core Design Contradiction:

Device complexityVSReliability

Solution Approach 1:

The patent changes the TPR from a fixed parameter to a configurable parameter with multiple candidate values. This allows the network node to select the appropriate TPR value based on current pathloss conditions, thereby maintaining uniform EPRE and improving channel estimation performance without requiring overly complex dynamic adjustment mechanisms

Inventive Principle:

Principle #35Parameter changes

Solution Approach 2:

The patent introduces dynamic adaptability by allowing the TPR to be selected from multiple candidates or configured dynamically based on pathloss conditions. This dynamic approach enables the system to maintain uniform EPRE and improve channel estimation performance while keeping the implementation relatively simple through predefined candidate values

Inventive Principle:

Principle #15Dynamics

3Ease of manufacture

If TPR is configured based on CDM group quantity and configuration type, then power scaling is simplified, but adaptability to varying pathloss conditions deteriorates

Engineering Contradiction:

Improvepower scaling simplicityVSAvoidadaptability to pathloss conditions

Core Design Contradiction:

Ease of manufactureVSAdaptability or versatility

Solution Approach 1:

The patent expands the TPR configuration from being solely dependent on CDM group quantity and configuration type to including pathloss conditions as a determining factor. The network node can select from multiple candidate TPR values or configure custom values based on actual pathloss measurements, thereby maintaining simplicity while significantly improving adaptability to varying channel conditions

Inventive Principle:

Principle #35Parameter changes

Solution Approach 2:

The patent makes the TPR configuration dynamic by incorporating pathloss conditions as a variable factor. Instead of using a static mapping based only on CDM groups and configuration types, the system can now adaptively select TPR values based on real-time pathloss conditions, improving versatility while keeping the configuration process relatively simple

Inventive Principle:

Principle #15Dynamics

Data Source

PatentUS20260039431A1Power scaling and traffic-to-pilot power ratio signaling for shared demodulation reference signal

Publication Date: 2026.02.05 QUALCOMM INC

AI summary

Various aspects of the present disclosure generally relate to wireless communication. Some aspects more specifically relate to sharing a wideband demodulation reference signal (DMRS) among multiple physical downlink shared channel (PDSCH) communications, and to configuring the wideband DMRS to have a common energy per resource element (EPRE). Furthermore, in some aspects, the multiple PDSCH communications may have a common EPRE, such that a traffic-to-pilot power ratio (TPR) is the same for all PDSCH communications that share the wideband DMRS. Alternatively, a set of candidate TPR values may be configured and mapped to respective TPR codepoints, and scheduling information for each PDSCH communication may dynamically indicate a TPR codepoint associated with the respective PDSCH according to an EPRE associated with the respective PDSCH communication and the common EPRE associated with the wideband DMRS.