Sequence-Based GC-DCI for Multi-User Beamforming and Low UE Complexity

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Solution Overview

Problem

Legacy group common downlink control information (GC-DCI) designs in wireless communications systems face inefficiencies such as high resource usage, increased power consumption and complexity at UEs, lack of beamforming techniques, and reduced coverage due to concatenated control information for multiple UEs, leading to suboptimal performance.

Innovation Solution

Implement sequence-based GC-DCI designs that combine separate control information messages for multiple UEs as sequences in a superimposed signal, allowing for multi-user beamforming and reduced resource usage, while enabling low-complexity detection and decoding at UEs.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If legacy GC-DCI designs concatenate control information for multiple UEs, then all UEs can receive control information, but resource usage increases and UE complexity increases

Engineering Contradiction:

Improvecontrol information deliveryVSAvoidUE detection complexity

Core Design Contradiction:

ReliabilityVSDevice complexity

Solution Approach 1:

The control information for multiple UEs is segmented into separate sequences, each associated with a specific UE or UE group. Instead of concatenating all control information into a single message, the patent divides it into multiple independent sequences that can be separately detected and decoded, reducing the complexity at each UE while maintaining reliable delivery to all UEs.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The patent introduces a new dimension for multiplexing control information by using sequence-based identification instead of time-frequency resource separation. Multiple control messages are transmitted simultaneously in the same time-frequency resources but distinguished by different sequences, enabling UEs to detect only their intended messages without decoding all concatenated control information.

Inventive Principle:

Principle #17Another dimension (Dimensionality change)

2Reliability

If legacy GC-DCI designs concatenate control information for multiple UEs, then all UEs can receive control information, but resource usage increases

Engineering Contradiction:

Improvecontrol information deliveryVSAvoidresource usage

Core Design Contradiction:

ReliabilityVSQuantity of substance

Solution Approach 1:

The patent merges multiple control information messages into a superimposed signal transmitted over the same time-frequency resources. By combining sequences for multiple UEs into a single superimposed transmission, the system delivers control information to all UEs simultaneously without requiring additional time-frequency resources for each individual message.

Inventive Principle:

Principle #5Merging (Combining)

Solution Approach 2:

The sequence-based design enables a single GC-DCI transmission to serve multiple UEs simultaneously with different levels of access. The same superimposed signal can be detected by UEs with full sequence sets or partial sequence sets, providing universal service to different UE types without requiring separate dedicated transmissions.

Inventive Principle:

Principle #6Universality (Multi-functionality)

3Reliability

If legacy GC-DCI designs concatenate control information for multiple UEs, then all UEs can receive control information, but power consumption increases

Engineering Contradiction:

Improvecontrol information deliveryVSAvoidUE power consumption

Core Design Contradiction:

ReliabilityVSUse of energy by moving object

Solution Approach 1:

UEs extract and detect only the sequences intended for them from the superimposed signal, rather than decoding the entire concatenated control information message. This extraction approach allows UEs to stop processing after identifying their intended sequence, significantly reducing the computational effort and power consumption required for control information reception.

Inventive Principle:

Principle #2Taking out (Extraction)

Solution Approach 2:

UEs perform partial detection by focusing only on detecting sequences associated with their UE group or themselves, rather than fully decoding all control information. This partial action is sufficient for the UE's needs and avoids the excessive power consumption of complete message decoding, while still ensuring reliable reception of relevant control information.

Inventive Principle:

Principle #16Partial or excessive action

Data Source

PatentUS20250392417A1Sequence-based group common downlink control information (GC-DCI)

Publication Date: 2025.12.25 QUALCOMM INC

AI summary

Certain aspects of the present disclosure provide techniques for conveying control information to multiple users. A method for wireless communications by an apparatus generally includes receiving a superimposed signal over a set of time frequency resources, the superimposed signal corresponding to a group common downlink control information (GC-DCI), the superimposed signal comprising a combination of a plurality of sequences; detecting, among the plurality of sequences, at least one sequence of a first set of sequences associated with the apparatus; and decoding the at least one sequence to obtain data for the apparatus.