Terminal Device HARQ Feedback Merging for Resource Conflict Resolution
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Solution Overview
Problem
In wireless communications, terminal devices face resource conflicts when sending HARQ feedback messages for different semi-persistent scheduling PDSCHs, leading to failed transmissions and unnecessary retransmissions due to overlapping time-domain resources.
Innovation Solution
The method involves sending multiple HARQ feedback messages in a single uplink control channel within a target resource, determined from a set of configured resources, ensuring all feedback messages can be correctly transmitted without resource conflicts.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the UE sends HARQ feedback messages for different SPS PDSCHs in separate PUCCH resources, then each feedback message can be transmitted independently, but time-domain resource conflicts occur when multiple feedback messages need to be sent in the same time unit
Solution Approach 1:
The patent merges multiple feedback messages into a single PUCCH resource for transmission. When the UE determines that multiple feedback messages would conflict in the same time unit, it combines these messages and transmits them together through one selected PUCCH resource, eliminating resource conflicts while ensuring all feedback is delivered reliably
Solution Approach 2:
Instead of assigning separate PUCCH resources to each feedback message and managing conflicts between them, the patent inverts the approach by selecting a single PUCCH resource to carry multiple feedback messages simultaneously, thereby preventing resource conflicts at the source
2Productivity
If the UE sends multiple feedback messages in the same time unit on different PUCCH resources, then all feedback messages can be transmitted simultaneously, but the limited number of available PUCCH resources causes resource conflicts
Solution Approach 1:
The patent combines multiple feedback messages into a single PUCCH transmission when resource conflicts are detected. By merging messages that would otherwise require separate PUCCH resources, the system maintains high transmission efficiency while working within the limited available PUCCH resource pool
3Ease of operation
If the UE uses a fixed time unit for sending HARQ feedback messages, then the timing is simple and predictable, but resource conflicts occur when multiple SPS PDSCHs have different timing deviations
Solution Approach 1:
The patent introduces dynamic resource selection based on the specific timing requirements of each feedback message. Instead of using a completely fixed timing scheme, the UE dynamically selects appropriate PUCCH resources considering the timing deviations of different SPS PDSCHs, while still maintaining predictable transmission patterns through structured resource selection rules
Data Source
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AI summary
Embodiments of this disclosure provide a feedback message sending method and a terminal device. The method includes: in a case that M feedback messages are to be sent in a same time unit, sending an uplink control channel on a target resource in the time unit, where the uplink control channel carries the M feedback messages, the target resource is one of N resources, the N resources are resources configured to send feedback messages, and the M feedback messages are hybrid automatic repeat request HARQ feedback messages for a semi-persistent scheduling physical downlink shared channel PDSCH.