PUCCH Transmission Deferral for HARQ-ACK Overlap Avoidance
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Solution Overview
Problem
Existing wireless communication systems face challenges in efficiently transmitting hybrid automatic repeat request acknowledgement (HARQ-ACK) feedback over physical uplink control channels (PUCCH) without overlapping with symbols not intended for uplink transmission, which can lead to increased latency and resource wastage.
Innovation Solution
A user equipment (UE) determines a PUCCH resource for transmitting HARQ-ACK feedback and defers the transmission if it overlaps with symbols not intended for uplink transmission. The UE then identifies an earliest target slot where the PUCCH transmission can be safely conducted without overlapping with such symbols.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of time
If the UE transmits PUCCH in the determined resource without checking for overlaps, then the transmission timing is maintained and latency is minimized, but the transmission may overlap with symbols not intended for uplink transmission causing interference and resource wastage
Solution Approach 1:
The UE performs a preliminary check before PUCCH transmission to determine whether the determined PUCCH resource overlaps with any symbol not intended for uplink transmission. This advance detection allows the system to prevent harmful transmissions before they occur, resolving the contradiction by adding a preventive step that maintains timing efficiency while ensuring transmission reliability
2Reliability
If the UE defers PUCCH transmission when overlap is detected, then resource wastage and interference are avoided, but the transmission latency increases due to the deferral to a later target slot
Solution Approach 1:
The system accepts the temporary loss of the original transmission opportunity (a short-lived event) as an acceptable cost to avoid the much more serious consequence of harmful interference. The deferral mechanism discards the conflicted transmission instance and schedules a new one, treating the individual transmission attempt as disposable to protect the overall system reliability
3Reliability
If the UE continuously monitors for suitable PUCCH transmission opportunities after deferral, then the feedback is eventually transmitted without overlap, but the complexity of the transmission management increases
Solution Approach 1:
The UE autonomously determines whether overlap occurs and self-manages the deferral process by identifying target slots for retransmission without requiring complex external coordination. The device serves itself by making local decisions about when and where to transmit, reducing the need for complex network-side management while ensuring reliable transmission
Data Source
AI summary
According to some embodiments of the disclosure, a user equipment (UE) may: determine a first physical uplink control channel (PUCCH) resource for a first PUCCH transmission in a first time unit, wherein the first PUCCH transmission carries hybrid automatic repeat request acknowledgement (HARQ-ACK) information bits for at least one semi-persistent scheduling (SPS) physical downlink shared channel (PDSCH) reception, and the first PUCCH resource is on a first frequency domain part; and in the event that the first PUCCH resource overlaps a symbol not intended for an uplink transmission on a second frequency domain part, defer the first PUCCH transmission.