Multi-Cell DCI Decoding via C-RNTI and CS-RNTI CRC Differentiation

Resolve Bottlenecks,
Find Innovative SolutionsGenerate Solutions

Solution Overview

Problem

Existing wireless communication systems face challenges in efficiently transmitting downlink feedback information (DFI) with downlink control information (DCI) for multi-cell scheduling, leading to potential misinterpretation of DCI formats and incorrect scheduling configurations.

Innovation Solution

The method involves receiving DCI associated with a specific format for shared channel scheduling on a set of cells, where the DCI is linked with a cell radio network temporary identifier (C-RNTI) and a configured scheduling radio network temporary identifier (CS-RNTI). The system decodes the DCI to identify scheduling on the set of cells or to extract DFI based on whether the C-RNTI or CS-RNTI satisfies a cyclic redundancy check (CRC).

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Adaptability or versatility

If DCI is transmitted for multi-cell scheduling without clear identifier differentiation, then scheduling flexibility is improved, but DCI format misinterpretation occurs

Engineering Contradiction:

Improvemulti-cell scheduling flexibilityVSAvoidDCI format identification accuracy

Core Design Contradiction:

Adaptability or versatilityVSReliability

Solution Approach 1:

The patent applies local quality by differentiating DCI identifiers based on their specific functions and contexts. Different RNTI types (C-RNTI, CS-RNTI, SI-RNTI) are used to mark different DCI formats, ensuring that each DCI is correctly identified and interpreted by the UE based on its specific purpose and cell configuration.

Inventive Principle:

Principle #3Local quality

2Measurement precision

If CRC verification is performed for both C-RNTI and CS-RNTI, then scheduling accuracy is improved, but processing complexity increases

Engineering Contradiction:

Improvescheduling configuration accuracyVSAvoidDCI decoding processing complexity

Core Design Contradiction:

Measurement precisionVSDevice complexity

Solution Approach 1:

The patent applies preliminary action by pre-configuring the UE with multiple RNTI types and their corresponding DCI formats through higher layer signaling. This allows the UE to efficiently perform CRC verification and correctly interpret DCI formats without complex real-time analysis, reducing processing complexity while maintaining accuracy.

Inventive Principle:

Principle #10Preliminary action

3Reliability

If downlink feedback information is transmitted separately from DCI, then feedback accuracy is improved, but transmission efficiency decreases

Engineering Contradiction:

Improvedownlink feedback accuracyVSAvoidcontrol information transmission efficiency

Core Design Contradiction:

ReliabilityVSProductivity

Solution Approach 1:

The patent applies merging by integrating downlink feedback information (DFI) directly into the DCI structure. The DFI is multiplexed with the scheduling information in the same DCI, allowing both control commands and feedback to be transmitted simultaneously in a single message, thereby improving transmission efficiency while maintaining feedback accuracy.

Inventive Principle:

Principle #5Merging (Combining)

Data Source

PatentUS12317259B2Transmission of downlink feedback information with downlink control information for multi-cell scheduling

Publication Date: 2025.05.27 QUALCOMM INC

AI summary

Various aspects of the present disclosure generally relate to wireless communication. In some aspects, a user equipment (UE) may receive downlink control information (DCI) associated with a DCI format for shared channel scheduling on a set of cells, wherein the DCI is associated with a cell radio network temporary identifier (C-RNTI) and a configured scheduling radio network temporary identifier (CS-RNTI). The UE may decode the DCI to identify a scheduling on the set of cells or to identify downlink feedback information (DFI) based at least in part on a determination of whether the C-RNTI or the CS-RNTI satisfies a cyclic redundancy check (CRC). Numerous other aspects are described.