Subslot-Based PUCCH HARQ-ACK Feedback for Low Latency
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Solution Overview
Problem
Current wireless communication systems face challenges in efficiently transmitting and receiving hybrid automatic repeat request (HARQ)-acknowledgement (ACK) information on physical uplink control channels (PUCCHs, particularly in supporting high data rates, low latency, and high-energy efficiency requirements for next-generation mobile communication systems.
Innovation Solution
A method is proposed where HARQ-ACK information is transmitted and received on multiple PUCCHs within a single slot, with each subslot configured to handle separate HARQ-ACK codebooks, allowing for efficient resource allocation and processing based on specific PDSCHs, using configuration information provided by the base station to determine the appropriate PUCCH resources and timing.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If HARQ-ACK information is transmitted on a single PUCCH per slot, then the PUCCH structure remains simple, but the latency and reliability for high data rate services deteriorate
Solution Approach 1:
The slot is divided into multiple subslots, and each subslot is configured to transmit HARQ-ACK information for specific PDSCHs separately. This segmentation allows the system to handle high data rate services with low latency requirements by transmitting HARQ-ACK in smaller, more manageable units across multiple subslots rather than consolidating everything into a single PUCCH transmission.
2Loss of time
If multiple PUCCHs are transmitted in one slot for different PDSCHs, then latency is reduced, but the complexity of resource allocation and processing increases
Solution Approach 1:
The slot is divided into multiple subslots, and each subslot is configured to transmit HARQ-ACK information for specific PDSCHs separately. This segmentation allows the system to handle high data rate services with low latency requirements by transmitting HARQ-ACK in smaller, more manageable units across multiple subslots rather than consolidating everything into a single PUCCH transmission.
Solution Approach 2:
Each subslot is configured with specific characteristics (such as starting symbol and length) tailored to the requirements of the PDSCHs it serves. This local quality approach allows optimized resource allocation for different services within the same slot, where each subslot can be tuned to its specific latency and reliability needs without affecting other subslots.
3Productivity
If per-subslot configuration is implemented, then resource allocation efficiency improves, but the configuration and processing overhead increases
Solution Approach 1:
The base station uses a single configuration message that applies to multiple subslots, making the configuration process efficient. This universal approach allows the system to maintain high resource allocation efficiency while avoiding the overhead of separate configurations for each subslot, as the same configuration parameters can be reused across different subslots.
Data Source
AI summary
A method of transmitting a physical uplink control channel (PUCCH) in a wireless communication system and a device therefor are disclosed. Specifically, the method performed by a user equipment (UE) includes receiving, from a base station (BS), configuration information for performing transmission and reception on a per subslot basis, receiving, from the BS, multiple physical downlink shared channels (PDSCHs) based on the configuration information, and transmitting, to the BS, the PUCCH including hybrid automatic repeat request (HARQ)-acknowledgement (ACK) information for the multiple PDSCHs in a specific slot. The PUCCH includes a first PUCCH transmitted in a first subslot of the specific slot and a second PUCCH transmitted in a second subslot of the specific slot. The first PUCCH and the second PUCCH each are transmitted based on a separately constructed HARQ-ACK codebook.