Shared DMRS Bundling for PDCCH Channel Estimation Under Interference

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Solution Overview

Problem

Wireless communications systems face challenges in effective channel estimation for physical downlink control channels (PDCCHs) due to interference and frequency-dependent signal propagation effects, leading to decoding failures and increased latency.

Innovation Solution

The implementation of a demodulation reference signal (DMRS) bundle across time-frequency resources of a Control Resource Set (CORESET), where multiple PDCCHs share a common DMRS, enhancing channel estimation through frequency diversity and reducing interference impact.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Measurement precision

If a separate DMRS is allocated for each PDCCH, then channel estimation can be performed for each individual PDCCH, but the bandwidth for channel estimation is limited and interference impact increases

Engineering Contradiction:

Improvechannel estimation accuracyVSAvoidinterference impact

Core Design Contradiction:

Measurement precisionVSObject-affected harmful factors

Solution Approach 1:

The patent merges multiple separate DMRS resources into a single shared DMRS that serves multiple PDCCHs within a DMRS bundle. This combining approach allows the UE to perform channel estimation across a wider bandwidth by aggregating reference signal resources, thereby improving measurement precision while diluting the impact of interference through frequency diversity.

Inventive Principle:

Principle #5Merging (Combining)

2Productivity

If multiple separate DMRS are used for multiple PDCCHs, then each PDCCH can be independently decoded, but the overall system complexity and processing overhead increase

Engineering Contradiction:

Improvedecoding efficiencyVSAvoidprocessing complexity

Core Design Contradiction:

ProductivityVSDevice complexity

Solution Approach 1:

The shared DMRS serves multiple PDCCHs simultaneously, making a single reference signal resource universal for multiple control channels. This multi-functionality approach maintains independent decoding capability for each PDCCH while reducing the total number of DMRS resources required, thereby lowering processing complexity and improving overall productivity.

Inventive Principle:

Principle #6Universality (Multi-functionality)

3Reliability

If wider bandwidth DMRS is used for channel estimation, then frequency diversity improves and interference is mitigated, but the bandwidth consumption and resource usage increase

Engineering Contradiction:

Improvedecoding reliabilityVSAvoidbandwidth resources

Core Design Contradiction:

ReliabilityVSQuantity of substance

Solution Approach 1:

The patent segments the control resource set into multiple DMRS bundles, where each bundle contains multiple PDCCHs that share a common DMRS. This segmentation allows the system to achieve wideband channel estimation benefits within structured resource allocations, improving decoding reliability through frequency diversity while efficiently managing bandwidth resource consumption through organized bundling.

Inventive Principle:

Principle #1Segmentation

Data Source

PatentUS20260046091A1Demodulation Reference Signal Bundle for Physical Downlink Control Channel

Publication Date: 2026.02.12 QUALCOMM INC

AI summary

Certain aspects of the present disclosure provide techniques for communication of a demodulation reference signal (DMRS) in a DMRS bundle. An example method for wireless communications by an apparatus includes obtaining signaling in a control resource set (CORESET), wherein the signaling includes a plurality of physical downlink control channels (PDCCHs) and a first demodulation reference signal (DMRS) shared among the plurality of PDCCHs; and communicating with a network entity based at least in part on at least one PDCCH of the plurality of PDCCHs and the first DMRS.