Delayed HARQ-ACK Uplink Repetitions for Downlink Overlap

Solution Overview

Problem

Existing wireless communication systems face inefficiencies and resource overhead due to dropped uplink repetitions carrying HARQ-ACK information when they overlap with downlink transmissions, requiring additional resources for retransmission.

Innovation Solution

The technology delays the transmission of both dropped and remaining uplink repetitions, allowing for efficient and reliable handling of overlapping uplink repetitions with SPS HARQ-ACK information by separating the transmission into subsets that do not overlap with downlink transmissions.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If uplink repetitions are transmitted according to the scheduled time, then the transmission timing is maintained, but resource overhead increases due to dropped repetitions requiring retransmission

Engineering Contradiction:

ImproveHARQ-ACK information deliveryVSAvoidresource overhead

Core Design Contradiction:

ReliabilityVSLoss of energy

Solution Approach 1:

The system performs preliminary detection to identify overlapping uplink repetitions with downlink transmissions before transmission occurs. When overlap is detected, the system proactively delays the uplink repetition transmission to a later time slot, preventing the drop and avoiding the need for retransmission, thus reducing resource overhead while maintaining reliability

Inventive Principle:

Principle #10Preliminary action

Solution Approach 2:

A determination component acts as an intermediary between the uplink repetition transmission and downlink transmission. This component detects overlaps and mediates the transmission timing by delaying uplink repetitions when necessary, ensuring that HARQ-ACK information is delivered reliably without wasting resources on dropped repetitions

Inventive Principle:

Principle #24Intermediary (Mediator)

2Loss of energy

If uplink repetitions are delayed to avoid overlap with downlink transmissions, then resource overhead is reduced, but transmission timing is altered

Engineering Contradiction:

Improveresource overheadVSAvoidtransmission timing

Core Design Contradiction:

Loss of energyVSLoss of time

Solution Approach 1:

The system dynamically adjusts the transmission timing of uplink repetitions based on real-time detection of downlink transmission overlaps. Instead of using fixed scheduling, the system flexibly delays transmissions only when necessary, optimizing resource usage while maintaining timely delivery of HARQ-ACK information

Inventive Principle:

Principle #15Dynamics

3Loss of time

If uplink repetitions are transmitted without delay, then transmission timing is maintained, but reliability decreases due to dropped repetitions

Engineering Contradiction:

Improvetransmission timingVSAvoidHARQ-ACK information delivery

Core Design Contradiction:

Loss of timeVSReliability

Solution Approach 1:

The system performs preliminary detection to identify overlapping uplink repetitions with downlink transmissions before transmission occurs. When overlap is detected, the system proactively delays the uplink repetition transmission to a later time slot, preventing the drop and avoiding the need for retransmission, thus reducing resource overhead while maintaining reliability

Inventive Principle:

Principle #10Preliminary action

Solution Approach 2:

A determination component acts as an intermediary between the uplink repetition transmission and downlink transmission. This component detects overlaps and mediates the transmission timing by delaying uplink repetitions when necessary, ensuring that HARQ-ACK information is delivered reliably without wasting resources on dropped repetitions

Inventive Principle:

Principle #24Intermediary (Mediator)

Data Source

PatentUS12537624B2Delayed semi-persistent scheduling HARQ-ACK with physical uplink channel repetition

Publication Date: 2026.01.27 QUALCOMM INC

AI summary

Apparatus, methods, and computer-readable media for multiplexing of overlapped uplink channel transmission repetitions are disclosed herein. A user equipment (UE) may determine whether a first subset of a first set of uplink channel transmission repetitions overlaps with a downlink transmission and determine whether to transmit a second subset of the first set of uplink channel transmission repetitions when the first subset overlaps with the downlink transmission. In some aspects, the second subset includes one or more uplink channel transmission repetitions that do not overlap with the downlink transmission. The UE may transmit, to a base station over an uplink channel, a second set of uplink channel transmission repetitions having the first subset and the second subset of the first set of uplink channel transmission repetitions when the second subset is determined to be transmitted. Thus, the reliability of uplink repetitions can be increased.