Two-Stage Downlink Control for Flexible Shared-Channel Scheduling

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Solution Overview

Problem

Existing wireless communication systems lack flexibility in scheduling downlink control information for multiple physical downlink shared channel occasions, leading to inefficiencies and inflexibility in updating communication parameters.

Innovation Solution

Implementing a two-stage downlink control information scheme, where the first stage indicates common time and frequency resources for a set of physical downlink shared channel occasions, and the second stage provides unique communication parameters for individual occasions, allowing for more flexible and efficient scheduling.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Device complexity

If a single downlink control information message is used to schedule multiple physical downlink shared channel occasions, then device complexity is reduced, but adaptability deteriorates due to inability to update communication parameters for individual occasions

Engineering Contradiction:

Improvecontrol information processingVSAvoidscheduling flexibility

Core Design Contradiction:

Device complexityVSAdaptability or versatility

Solution Approach 1:

The downlink control information is segmented into two distinct stages: first-stage DCI containing common scheduling information applicable to multiple occasions, and second-stage DCI containing occasion-specific communication parameters. This segmentation allows the system to maintain reduced complexity from single-message scheduling while gaining the adaptability of individual parameter updates for each physical downlink shared channel occasion.

Inventive Principle:

Principle #1Segmentation

2Adaptability or versatility

If communication parameters are updated for each physical downlink shared channel occasion, then adaptability improves, but loss of information increases due to repeated transmission of common scheduling information

Engineering Contradiction:

Improveparameter update capabilityVSAvoidredundant control information

Core Design Contradiction:

Adaptability or versatilityVSLoss of information

Solution Approach 1:

By dividing control information into common and specific components across two stages, the system transmits common scheduling information once in the first stage and only occasion-specific parameters in the second stage, eliminating redundant transmissions while maintaining full adaptability.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The second-stage DCI extracts and transmits only the occasion-specific communication parameters that differ between occasions, separating them from the common scheduling information that is already provided in the first stage, thereby minimizing redundant information transmission.

Inventive Principle:

Principle #2Taking out (Extraction)

3Adaptability or versatility

If two-stage downlink control information is implemented, then adaptability improves, but device complexity increases due to processing multiple control messages

Engineering Contradiction:

Improvescheduling flexibilityVSAvoidcontrol information processing

Core Design Contradiction:

Adaptability or versatilityVSDevice complexity

Solution Approach 1:

The segmentation into two stages with clearly defined roles (common information in stage 1, specific parameters in stage 2) organizes the processing logic, allowing the UE to first process common scheduling information and then apply occasion-specific updates, making the enhanced adaptability manageable despite increased processing steps.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The first-stage DCI performs preliminary scheduling by establishing common time and frequency resources in advance, so that when the second-stage DCI arrives with specific parameters, the UE already has the basic scheduling context prepared, reducing the complexity burden of processing the second stage.

Inventive Principle:

Principle #10Preliminary action

4Productivity

If first-stage downlink control information schedules multiple occasions, then productivity improves, but adaptability deteriorates due to fixed common parameters

Engineering Contradiction:

Improvescheduling efficiencyVSAvoidparameter flexibility

Core Design Contradiction:

ProductivityVSAdaptability or versatility

Solution Approach 1:

The two-stage structure segments control information into common (productivity-oriented) and specific (adaptability-oriented) components, allowing the first stage to efficiently schedule multiple occasions with common parameters while the second stage provides necessary adaptability through occasion-specific updates.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The system merges the advantages of both approaches by combining first-stage common scheduling (which improves productivity) with second-stage specific parameter updates (which provide adaptability), creating a hybrid approach that achieves both goals simultaneously.

Inventive Principle:

Principle #5Merging (Combining)

Data Source

PatentUS12396003B2Techniques for scheduling using two-stage control messages

Publication Date: 2025.08.19 QUALCOMM INC

AI summary

Methods, systems, and devices for method for wireless communication are described. A user equipment (UE) may receive a first downlink control information scheduling a set of time and frequency resources to a set of downlink shared channel occasions. The UE may also receive, during a first downlink shared channel occasion of the set of downlink shared channel occasions, a second downlink control information indicating a first set of communication parameters specific to a downlink message associated with the first downlink shared channel occasion. The UE may then receive the downlink message during the first downlink shared channel occasion using the first set of communication parameters based on the second downlink control information.