Multi-Carrier HARQ-ACK Feedback Reselection for Downlink Conflicts

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Solution Overview

Problem

In the new radio (NR) system, conflicts between HARQ-ACK feedback resources and downlink resources result in the discarding of HARQ-ACK information, degrading the performance of semi-persistent scheduling PDSCH.

Innovation Solution

A method and apparatus for determining a second HARQ-ACK feedback resource based on a first HARQ-ACK feedback resource and multiple configured carriers, allowing for resource re-selection to avoid conflicts and ensure timely transmission of HARQ-ACK information.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If HARQ-ACK feedback is transmitted on the first HARQ-ACK feedback resource determined by network indication, then the feedback timing follows network scheduling, but the resource may conflict with downlink resources causing HARQ-ACK information to be discarded

Engineering Contradiction:

ImproveHARQ-ACK information transmission reliabilityVSAvoidResource conflict with downlink resources

Core Design Contradiction:

ReliabilityVSObject-affected harmful factors

Solution Approach 1:

The terminal performs preliminary detection to identify whether the first HARQ-ACK feedback resource conflicts with downlink resources before transmitting HARQ-ACK information. By detecting the resource availability in advance and selecting an alternative uplink resource when conflict is detected, the terminal prevents HARQ-ACK information loss due to resource conflicts, thereby improving transmission reliability

Inventive Principle:

Principle #10Preliminary action

Solution Approach 2:

The terminal changes the resource parameter by switching from the network-indicated first HARQ-ACK feedback resource to a second uplink resource when conflict is detected. This parameter change enables the HARQ-ACK information to be transmitted on a non-conflicting resource, resolving the harmful effect of resource conflicts while maintaining reliable feedback transmission

Inventive Principle:

Principle #35Parameter changes

2Device complexity

If HARQ-ACK information is discarded due to resource conflict, then resource allocation simplicity is maintained, but semi-persistent scheduling PDSCH performance degrades

Engineering Contradiction:

ImproveResource allocation complexityVSAvoidSPS PDSCH performance

Core Design Contradiction:

Device complexityVSProductivity

Solution Approach 1:

The terminal performs preliminary detection of resource conflicts and proactively selects alternative uplink resources before HARQ-ACK information transmission. This preliminary action prevents information loss and maintains SPS PDSCH performance without significantly increasing resource allocation complexity, as the detection and selection process follows a clear predetermined procedure

Inventive Principle:

Principle #10Preliminary action

Solution Approach 2:

The terminal autonomously detects resource conflicts and selects alternative uplink resources without requiring complex network coordination or additional signaling. This self-service approach resolves resource conflicts while maintaining relatively simple resource allocation mechanisms, thereby preserving SPS PDSCH performance without substantially increasing system complexity

Inventive Principle:

Principle #25Self-service

3Adaptability or versatility

If the terminal uses the network-indicated HARQ-ACK feedback resource, then network control is maintained, but uplink resource utilization is suboptimal due to conflicts

Engineering Contradiction:

ImproveResource selection flexibilityVSAvoidUplink resource utilization efficiency

Core Design Contradiction:

Adaptability or versatilityVSLoss of energy

Solution Approach 1:

The terminal performs preliminary detection of uplink resource availability and pre-selects alternative resources before transmission. This preliminary action enables flexible adaptation to resource conflicts while improving uplink resource utilization efficiency, as the terminal can choose from multiple available uplink resources rather than being constrained to a single network-indicated resource

Inventive Principle:

Principle #10Preliminary action

Solution Approach 2:

The terminal dynamically changes the resource selection parameter by switching from the fixed network-indicated first HARQ-ACK feedback resource to an alternative second uplink resource when conflict is detected. This parameter change enhances resource selection flexibility and improves uplink resource utilization efficiency by enabling the terminal to adapt to actual resource availability conditions

Inventive Principle:

Principle #35Parameter changes

Data Source

PatentUS12445234B2Method, apparatus, and terminal for feeding back HARQ-ACK information

Publication Date: 2025.10.14 VIVO MOBILE COMM CO LTD

AI summary

This application discloses a method, an apparatus, and a terminal for feeding back HARQ-ACK information. The method for feeding back HARQ-ACK information according to embodiments of this application includes: A terminal determines, when N carriers are configured, a second hybrid automatic repeat request acknowledgement HARQ-ACK feedback resource based on a first HARQ-ACK feedback resource and the N carriers; and the terminal transmits HARQ-ACK information based on the second HARQ-ACK feedback resource, where the first HARQ-ACK feedback resource is determined according to a network indication, N≥2, and N is an integer.