Multi-Cell HARQ Feedback Timing Under Unified Scheduling

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Solution Overview

Problem

The limited 5G New Radio (NR) resources in communication systems pose challenges in scheduling data transmission across multiple cells or carriers, leading to inconsistencies in hybrid automatic repeat request (HARQ) feedback, which affects data transmission reliability.

Innovation Solution

A method and apparatus for determining HARQ feedback by acquiring time domain configuration information from scheduling instructions, enabling consistent understanding between terminal and network devices for HARQ feedback timing across multiple cells or carriers.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Productivity

If data transmission of multiple cells or multiple carriers is scheduled through a single scheduling instruction, then resource utilization efficiency is improved, but HARQ feedback consistency deteriorates

Engineering Contradiction:
Improveresource utilization efficiencyVSAvoidHARQ feedback consistency
Core Design Contradiction:
ProductivityVSReliability

Solution Approach 1:

The patent segments the HARQ feedback timing determination by introducing cell-specific or carrier-specific time domain configuration information for each scheduled cell or carrier within the multi-cell/multi-carrier scheduling instruction. This allows each cell/carrier to have independent HARQ feedback timing parameters (such as K1 values indicating uplink slot offsets), ensuring that while resources are efficiently consolidated under one scheduling instruction, the HARQ feedback timing for each cell/carrier remains distinct and consistent, thereby resolving the contradiction between resource utilization efficiency and HARQ feedback consistency.

Inventive Principle:
Principle #1Segmentation

2Device complexity

If HARQ feedback timing is determined without cell-specific time domain configuration, then device complexity is reduced, but data transmission reliability deteriorates

Engineering Contradiction:
ImproveHARQ feedback determination complexityVSAvoiddata transmission reliability
Core Design Contradiction:
Device complexityVSReliability

Solution Approach 1:

The patent applies local quality by introducing cell-specific or carrier-specific time domain configuration information within the scheduling instruction, allowing each cell or carrier to have customized HARQ feedback timing parameters tailored to its specific requirements. This means that while the overall system maintains a unified scheduling mechanism, each cell/carrier can have locally optimized HARQ timing configurations (such as different K1 values), thereby improving data transmission reliability without requiring complex centralized control for each cell, thus balancing device complexity and transmission reliability.

Inventive Principle:
Principle #3Local quality

Data Source

PatentUS20250385759A1Method and apparatus for determining hybrid automatic repeat request (HARQ) feedback
Publication Date: 2025.12.18 BEIJING XIAOMI MOBILE SOFTWARE CO LTD
  • US20250385759A1 patent drawing
  • US20250385759A1 patent drawing
  • US20250385759A1 patent drawing

AI summary

A method for determining hybrid automatic repeat request (HARQ) feedback is performed by a terminal device, and includes: receiving a scheduling instruction for scheduling data transmission on multiple cells; acquiring time domain configuration information from the scheduling instruction; and determining time domain information of the HARQ feedback of each cell among the scheduled multiple cells according to the time domain configuration information.