HARQ-ACK Feedback Timing for Flexible 5G PDSCH Scheduling

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Solution Overview

Problem

Existing wireless communication systems face challenges in efficiently managing HARQ-ACK feedback, particularly in 5G systems with variable HARQ-ACK feedback delays and high DCI overhead due to flexible numerology and larger bandwidths, which affect data transmission efficiency and latency.

Innovation Solution

A method and apparatus for a terminal in a wireless communication system that includes receiving a physical downlink control channel (PDCCH), a physical downlink shared channel (PDSCH), and transmitting hybrid automatic repeat request-acknowledgement (HARQ-ACK) feedback information, with a processor configured to manage these processes.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Productivity

If flexible numerology and larger bandwidths are used in 5G systems, then transmission rates and service capabilities are improved, but DCI overhead increases

Engineering Contradiction:

Improvetransmission rateVSAvoidDCI overhead

Core Design Contradiction:

ProductivityVSQuantity of substance

Solution Approach 1:

The patent segments the HARQ-ACK feedback mechanism by introducing separate indication fields for different PDSCH types (first type and second type) within the DCI. This segmentation allows efficient handling of multiple PDSCHs with different numerologies, reducing the overall DCI overhead while maintaining support for flexible numerology and large bandwidths.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The patent implements dynamic HARQ-ACK feedback delay management where the feedback timing can be flexibly adjusted based on the PDSCH type and numerology configuration. This dynamic approach optimizes the balance between transmission rate improvements and DCI overhead control in 5G systems.

Inventive Principle:

Principle #15Dynamics

2Adaptability or versatility

If variable HARQ-ACK feedback delays are implemented, then system adaptability is improved, but feedback management complexity increases

Engineering Contradiction:

Improvefeedback delay flexibilityVSAvoidfeedback management complexity

Core Design Contradiction:

Adaptability or versatilityVSDevice complexity

Solution Approach 1:

The patent applies local quality by configuring different HARQ-ACK feedback delay parameters specifically for different PDSCH types. The first parameter set applies to first-type PDSCHs while the second parameter set applies to second-type PDSCHs, allowing optimized feedback management for each type without increasing overall system complexity.

Inventive Principle:

Principle #3Local quality

Solution Approach 2:

The patent implements preliminary action by pre-configuring multiple HARQ-ACK feedback delay parameters through higher-layer signaling before data transmission. This allows the system to adapt to different feedback delay requirements without real-time complex calculations, reducing feedback management complexity while maintaining high adaptability.

Inventive Principle:

Principle #10Preliminary action

Data Source

PatentUS12556343B2Method and apparatus for HARQ-ACK feedback in wireless communication system

Publication Date: 2026.02.17 SAMSUNG ELECTRONICS CO LTD

AI summary

The disclosure relates to a 5G or 6G communication system for supporting a higher data transmission rate. An apparatus in a wireless communication system and a method performed by the same are provided, with the method including receiving a physical downlink control channel (PDCCH), receiving a physical downlink shared channel (PDSCH) based on the received PDCCH, and transmitting hybrid automatic repeat request-acknowledgement (HARQ-ACK) feedback information for the received PDSCH, thereby improving improve communication efficiency.