PUCCH Resource Configuration for 5G HARQ-ACK Feedback
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Solution Overview
Problem
The complexity in configuring subslot-level PUCCH resource sets for terminal devices in 5G mobile communications systems leads to high overheads and inefficiencies, particularly due to PUCCH resources falling outside subslots or crossing slot boundaries, which complicates the feedback latency reduction for URLLC services.
Innovation Solution
Configuring time unit-level PUCCH resource sets using higher-layer signaling, allowing terminal devices to determine PUCCH resources within time subunits, thereby avoiding exceptions such as resources falling outside subunits or crossing boundaries, and ensuring efficient HARQ-ACK message transmission.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of time
If subslot-level PUCCH resource sets are configured by higher-layer signaling, then feedback latency for URLLC service is reduced, but configuration complexity increases and PUCCH resources may fall outside subslots or cross slot boundaries
Solution Approach 1:
The slot is divided into multiple subslots, and HARQ-ACK messages are fed back in each subslot separately. This segmentation enables reduced feedback latency for URLLC services while the patent resolves the complexity issue by configuring PUCCH resources at the slot level rather than subslot level, avoiding resources falling outside subslots or crossing boundaries
Solution Approach 2:
The patent introduces an intermediary mapping mechanism where slot-level PUCCH resource sets are configured by higher-layer signaling, and terminal devices determine specific subslot-level PUCCH resources through predefined mapping rules. This intermediary approach avoids direct configuration of subslot-level resources, reducing signaling complexity while maintaining low latency
2Loss of time
If subslot-level PUCCH resource sets are configured by higher-layer signaling, then feedback latency for URLLC service is reduced, but signaling overhead increases due to frequent reconfiguration
Solution Approach 1:
The slot is divided into multiple subslots for HARQ-ACK feedback, but the PUCCH resource configuration is maintained at the slot level. This segmentation of feedback timing without corresponding segmentation of resource configuration reduces signaling overhead while maintaining low latency
Solution Approach 2:
PUCCH resource sets are pre-configured at the slot level before the actual HARQ-ACK transmission occurs. This preliminary configuration avoids the need for frequent reconfiguration when subslot boundaries change, reducing signaling overhead
3Productivity
If PUCCH resources are configured at subslot level, then HARQ-ACK feedback timing is optimized, but resource allocation reliability decreases due to resources falling outside subslots or crossing boundaries
Solution Approach 1:
The slot is segmented into subslots for feedback timing optimization, while the PUCCH resource configuration remains at the slot level to ensure reliability. This dual-level approach maintains both feedback efficiency and resource allocation reliability
Solution Approach 2:
The patent uses a mapping mechanism where slot-level PUCCH resource sets serve as templates for subslot-level resource determination. This copying approach ensures that resources are consistently allocated within valid boundaries while maintaining optimized feedback timing
Data Source
AI summary
A method for sending and receiving a HARQ-ACK message is provided. The method includes: A terminal device selects a first PUCCH resource from at least one first PUCCH resource set based on a first time subunit. The first time subunit is a time subunit in which the HARQ-ACK message is located. The first PUCCH resource is a PUCCH resource in the first time subunit. The at least one first PUCCH resource set is configured by a network device for the terminal device based on a time unit. The terminal device sends the HARQ-ACK message to the network device based on the first PUCCH resource.