Two-Stage PDCCH Dynamic DCI Sizing for Co-Scheduled Cells

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Solution Overview

Problem

Existing 5G NR technologies face inefficiencies in DCI size allocation due to fixed scheduling of cells, leading to wasted resources when the number of co-scheduled cells is small.

Innovation Solution

Implementing a two-stage PDCCH with dynamic DCI size indication, where a first DCI portion indicates the size of a second DCI portion, allowing for dynamic adjustment based on the number of scheduled cells.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Ease of manufacture

If fixed DCI size is used for scheduling cells, then DCI structure is simple, but resource utilization is poor when number of co-scheduled cells is small

Engineering Contradiction:

ImproveDCI structure simplicityVSAvoidresource wastage

Core Design Contradiction:

Ease of manufactureVSLoss of energy

Solution Approach 1:

The DCI is divided into a first DCI portion and a second DCI portion. The first DCI portion contains a first set of fields and has a first size, while the second DCI portion contains a second set of fields and has a second size. This segmentation allows the DCI to be dynamically adjusted based on the number of co-scheduled cells, reducing resource wastage while maintaining structural simplicity through the two-part architecture.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The patent implements dynamic DCI size indication where the size of the second DCI portion is indicated by the first DCI portion. The actual size of the second DCI portion varies based on the number of co-scheduled cells (e.g., 1 cell, 2 cells, or 4 cells). This dynamic adjustment optimizes resource utilization while maintaining ease of implementation through standardized size indication mechanisms.

Inventive Principle:

Principle #15Dynamics

2Loss of energy

If dynamic DCI size adjustment is implemented, then resource utilization improves, but DCI structure complexity increases

Engineering Contradiction:

Improveresource utilization efficiencyVSAvoidDCI structure complexity

Core Design Contradiction:

Loss of energyVSDevice complexity

Solution Approach 1:

By segmenting the DCI into two distinct portions with clearly defined roles, the complexity of dynamic size adjustment is managed systematically. The first DCI portion handles common fields and size indication, while the second DCI portion handles cell-specific fields. This segmentation makes the complex dynamic adjustment process more manageable and implementable.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The patent changes the size parameter of the second DCI portion dynamically based on the number of co-scheduled cells. The first DCI portion indicates the size of the second DCI portion, allowing the system to adapt to different scheduling scenarios (1 cell, 2 cells, or 4 cells) without requiring complete structural redesign. This parameter-based approach manages complexity through standardized variation rather than complete redesign.

Inventive Principle:

Principle #35Parameter changes

Data Source

PatentUS12610370B2Two-stage PDCCH with dynamic DCI size indication

Publication Date: 2026.04.21 QUALCOMM INC

AI summary

Method and apparatus for two-stage PDCCH with dynamic DCI size indication. The apparatus receives DCI including a first DCI portion comprising an indication indicating a size of a second DCI portion, and the second DCI portion having the size based on the indication in the first DCI portion. The apparatus transmits or receives communication with a network entity using resources scheduled in the second DCI portion. The apparatus receives RRC signaling indicating a first DCI size of the first DCI portion from a defined set of sizes.