Uplink HARQ-ACK Repetition Scheduling Under Downlink Overlap
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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 method involves delaying the transmission of both dropped and remaining uplink repetitions, allowing for a subset of repetitions to be transmitted without overlapping with downlink transmissions, thereby increasing efficiency and reliability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If uplink repetitions are transmitted according to the scheduled time, then the transmission timing is maintained, but overlap with downlink transmissions occurs causing HARQ-ACK information loss
Solution Approach 1:
The UE performs preliminary detection of downlink transmissions before uplink repetition transmission. When overlap is detected, the UE proactively cancels the uplink repetition transmission in advance, preventing the harmful overlap before it occurs. This preliminary detection and cancellation mechanism ensures HARQ-ACK information reliability while avoiding timing conflicts.
2Reliability
If uplink repetitions are cancelled when overlapping with downlink transmissions, then transmission conflicts are avoided, but additional retransmission resources are required
Solution Approach 1:
The invention extracts and separates the conflicting transmission components by identifying which specific uplink repetitions overlap with downlink transmissions. Only the overlapping repetitions are cancelled while non-overlapping repetitions continue to transmit. This selective cancellation approach minimizes resource waste by maintaining necessary transmissions while avoiding only the harmful overlaps.
3Reliability
If all uplink repetitions are retransmitted when overlap occurs, then HARQ-ACK information is preserved, but system overhead and complexity increase
Solution Approach 1:
Instead of retransmitting all uplink repetitions when overlap occurs, the invention applies partial action by identifying and retransmitting only the specific repetitions that were cancelled due to overlap. This partial retransmission approach maintains HARQ-ACK information integrity while significantly reducing the complexity and overhead associated with managing retransmissions of all repetitions.
Data Source
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.