Downlink Control Information Rate-Splitting for Multi-UE Scheduling

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Solution Overview

Problem

Existing wireless communication systems face inefficiencies in managing downlink control information (DCI) transmission, particularly in scenarios involving multiple UEs and varying transmission parameters, leading to increased overhead and complexity.

Innovation Solution

Implementing a rate-splitting mechanism where a network entity sends delta values and additional DCI to a user equipment (UE) to determine transmission parameters, allowing the UE to receive multiple messages efficiently using a single channel.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Productivity

If traditional DCI transmission methods are used to schedule multiple UEs with different transmission parameters, then each UE can receive its scheduled information, but the DCI overhead and signaling complexity increase significantly

Engineering Contradiction:

Improvecommunication efficiencyVSAvoidDCI information volume

Core Design Contradiction:

ProductivityVSQuantity of substance

Solution Approach 1:

The patent segments the transmission parameters into two parts: common parameters shared by multiple UEs and UE-specific parameters. The common parameters are transmitted once in a single DCI message, while UE-specific parameters are handled individually. This segmentation reduces redundant information transmission and lowers overall DCI overhead when scheduling multiple UEs with similar parameters.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The patent creates a universal DCI structure that can serve multiple UEs simultaneously by incorporating common transmission parameters that apply to all scheduled UEs. This multi-functional DCI message eliminates the need to send separate complete parameter sets to each UE, thereby reducing signaling complexity and improving communication efficiency.

Inventive Principle:

Principle #6Universality (Multi-functionality)

2Manufacturing precision

If separate DCI messages are sent to each UE for individual message scheduling, then each message can be precisely controlled, but the signaling complexity and overhead increase

Engineering Contradiction:

Improvetransmission parameter precisionVSAvoidsignaling complexity

Core Design Contradiction:

Manufacturing precisionVSDevice complexity

Solution Approach 1:

The patent merges multiple DCI messages into a single unified DCI structure that schedules multiple messages for multiple UEs. By combining common parameters that are identical across messages into one transmission, the patent maintains precise control over each individual message while significantly reducing signaling complexity and overhead.

Inventive Principle:

Principle #5Merging (Combining)

Solution Approach 2:

The patent applies partial action by transmitting only the necessary common parameters once, rather than repeating complete parameter sets for each message. This approach provides sufficient information for all UEs to decode their respective messages without the excessive redundancy of full parameter repetition, thereby reducing signaling complexity while maintaining precision.

Inventive Principle:

Principle #16Partial or excessive action

Data Source

PatentUS12471108B2Downlink control information procedures

Publication Date: 2025.11.11 QUALCOMM INC

AI summary

Aspects relate to a network entity sending downlink control information to a user equipment (UE) that the UE uses to receive a message from the network entity. The network entity may send to the UE a first DCI that includes a first transmission parameter or an indication thereof to be used for receiving a first message and a second DCI that includes a second transmission parameter to be used for receiving a second message.