Multicast DCI Field Size Alignment for Reliable Blind Decoding

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Solution Overview

Problem

Existing communication systems face challenges in aligning downlink control information (DCI) size estimation for multicast traffic due to differing higher layer configurations among UEs, leading to failed blind decoding attempts.

Innovation Solution

A device determines field sizes in DCI based on a set of parameters associated with field size estimation for multicast traffic, using RRC configurations and default values to align DCI size estimation across UEs.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Adaptability or versatility

If different higher layer configurations are used among UEs for multicast traffic, then each UE can be optimized for its specific requirements, but DCI size estimation becomes misaligned leading to failed blind decoding attempts

Engineering Contradiction:

Improveconfiguration flexibilityVSAvoiddecoding success rate

Core Design Contradiction:

Adaptability or versatilityVSReliability

Solution Approach 1:

The patent extracts the field size estimation parameters from the higher layer configuration and places them directly in the DCI message. This allows UEs to obtain the necessary field size information from the DCI itself rather than relying on potentially conflicting higher layer configurations, thereby aligning DCI size estimation across all UEs while maintaining configuration flexibility

Inventive Principle:

Principle #2Taking out (Extraction)

Solution Approach 2:

The patent introduces a new intermediary mechanism where the DCI message carries field size estimation parameters that mediate between the higher layer configuration and the actual DCI decoding process. This intermediary information in the DCI ensures all UEs estimate the DCI size correctly regardless of their individual higher layer configurations

Inventive Principle:

Principle #24Intermediary (Mediator)

2Reliability

If field size estimation parameters are included in DCI, then DCI size alignment across UEs is achieved, but DCI message size increases

Engineering Contradiction:

Improvedecoding success rateVSAvoidDCI message size

Core Design Contradiction:

ReliabilityVSLength of moving object

Solution Approach 1:

The patent applies partial action by including only the necessary field size estimation parameters in the DCI message rather than complete configuration information. This selective inclusion achieves DCI size alignment across UEs while minimizing the increase in DCI message size

Inventive Principle:

Principle #16Partial or excessive action

3Productivity

If blind decoding is performed with incorrect DCI size estimation, then decoding attempts are made, but resource waste occurs due to failed attempts

Engineering Contradiction:

Improvedecoding throughputVSAvoidpower consumption

Core Design Contradiction:

ProductivityVSLoss of energy

Solution Approach 1:

The patent applies preliminary action by providing field size estimation parameters in the DCI message before the actual decoding process. This allows UEs to correctly estimate the DCI size in advance, preventing failed blind decoding attempts and the associated resource waste and power consumption

Inventive Principle:

Principle #10Preliminary action

Data Source

PatentUS12581493B2Downlink size estimation for multicast traffic

Publication Date: 2026.03.17 NOKIA TECHNOLOGIES OY

AI summary

Embodiments of the present disclosure relates to estimating downlink size for a multicast traffic. According to embodiments of the present disclosure, a first device receives downlink control information (DCI) for a multicast traffic. The first device determines field size(s) in the DCI based on one or more parameters which are associated with the field size estimation for the multicast traffic. The first device decodes the DCI based on the determined field sizes(s). In this way, the DCI can be blindly decoded correctly.