Shared-Channel DCI Codeword Interleaving for Reliable Rate Matching

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Solution Overview

Problem

Existing wireless communication systems lack effective procedures for rate matching and interleaving of codewords in shared channel downlink control information transmissions, leading to increased blind decoding and reduced communication quality, resource utilization, and reliability.

Innovation Solution

Implementing a block interleaver to mix coded bits from all codewords, applying rate-matching and interleaving rules based on modulation and coding schemes, ensuring fair resource selection and diversity, and adjusting codeword lengths through repetition or puncturing to achieve optimal resource utilization and reliability.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If codewords are transmitted without rate matching and interleaving procedures, then transmission simplicity is maintained, but communication quality and reliability deteriorate

Engineering Contradiction:

Improvecommunication qualityVSAvoidprocessing complexity

Core Design Contradiction:

ReliabilityVSDevice complexity

Solution Approach 1:

The patent segments the codeword transmission process into distinct stages: rate matching (adjusting codeword length to match available resources) and block interleaving (rearranging bits to achieve diversity). This segmentation allows each processing stage to be optimized independently, improving reliability without overwhelming system complexity

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The patent applies rate matching and interleaving procedures before transmission to pre-optimize the codeword structure. By performing these operations in advance, the system ensures improved communication quality and reliability while avoiding the need for complex real-time processing during transmission

Inventive Principle:

Principle #10Preliminary action

2Measurement precision

If blind decoding is increased to handle shared channel DCI transmissions, then decoding accuracy may improve, but processing time and overhead increase

Engineering Contradiction:

Improvedecoding accuracyVSAvoidprocessing time

Core Design Contradiction:

Measurement precisionVSLoss of time

Solution Approach 1:

The patent applies different processing treatments to different parts of the DCI message. Specifically, it applies rate matching and interleaving only to the shared channel DCI transmissions, while keeping other control channel transmissions simpler. This localized approach improves decoding accuracy for shared channel transmissions without unnecessarily increasing processing time across all DCI types

Inventive Principle:

Principle #3Local quality

Solution Approach 2:

The patent applies rate matching and interleaving procedures selectively rather than universally. By applying these procedures only where needed (in shared channel DCI transmissions), the system achieves sufficient decoding accuracy without the excessive processing time that would result from applying the same procedures to all DCI transmissions

Inventive Principle:

Principle #16Partial or excessive action

3Reliability

If resource allocation is optimized for individual UEs, then communication reliability improves, but resource utilization efficiency decreases

Engineering Contradiction:

Improvecommunication reliabilityVSAvoidresource utilization

Core Design Contradiction:

ReliabilityVSProductivity

Solution Approach 1:

The patent merges multiple UE-specific DCI messages into a single shared channel DCI transmission. By combining resources and applying rate matching and interleaving to the aggregated message, the system maintains reliability through proper error correction while improving overall resource utilization efficiency through shared transmission resources

Inventive Principle:

Principle #5Merging (Combining)

Solution Approach 2:

The patent creates a universal processing framework that handles both individual UE transmissions and multi-UE shared channel transmissions. The same rate matching and interleaving procedures are applied regardless of whether the transmission is UE-specific or shared, enabling flexible resource allocation that maintains reliability while improving overall system productivity

Inventive Principle:

Principle #6Universality (Multi-functionality)

Data Source

PatentUS20260005796A1Codeword rate-matching for shared channel downlink control information transmissions

Publication Date: 2026.01.01 QUALCOMM INC

AI summary

Methods, systems, and devices for wireless communications are described. A network entity may output a first downlink control information (DCI) message via a downlink control channel that is broadcast to a plurality of user equipment (UEs). The network entity may output, in accordance with the first DCI message, a second DCI message via a downlink shared channel that is broadcast to the plurality of UEs, the second DCI message that may include UE-specific control information for each UE of the plurality of UEs and the UE-specific control information included in the second DCI message may include a plurality of codewords that are block interleaved in accordance with a rate matching rule. The network entity may communicate with at least one of the plurality of UEs in accordance with the second DCI message.