5G HARQ-ACK Sub-Slot Timing for Flexible Uplink Feedback
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Solution Overview
Problem
Existing wireless communication systems face challenges in efficiently configuring HARQ-ACK codebooks when terminals transmit multiple HARQ-ACKs within a single slot, particularly in high-frequency bands like the 60 GHz band, where path loss and transmission distance are significant issues.
Innovation Solution
The method involves configuring sub-slots with shorter time lengths than traditional slots for transmitting HARQ-ACK information, allowing for more precise scheduling and feedback within the wireless communication system.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If traditional slot-based timing is used for HARQ-ACK feedback, then the system maintains simplicity in resource allocation, but the timing precision and scheduling flexibility are insufficient for high-frequency band communications
Solution Approach 1:
The patent divides a traditional slot into multiple sub-slots, each with its own timing structure. This segmentation allows for more precise timing of HARQ-ACK feedback within the slot, enabling the terminal to transmit feedback in specific sub-slots based on the scheduling timing, thereby improving timing precision while maintaining manageable resource allocation through structured sub-slot configuration.
2Adaptability or versatility
If sub-slots are introduced for HARQ-ACK transmission, then the scheduling flexibility and timing precision are improved, but the system complexity increases
Solution Approach 1:
The patent enables dynamic selection of sub-slot based timing structures through configuration parameters. The system can adaptively choose different timing relationships between downlink data reception and HARQ-ACK transmission based on scheduling conditions, providing flexibility while managing complexity through standardized configuration mechanisms that define multiple predefined timing options.
3Productivity
If multiple HARQ-ACKs are transmitted in one slot using traditional timing, then the feedback coverage is sufficient, but the timing optimization for high-frequency bands is lost
Solution Approach 1:
The patent establishes predefined timing relationships between downlink data reception and HARQ-ACK transmission in sub-slots. By determining the timing offset in advance through configuration parameters, the system ensures that HARQ-ACK feedback is transmitted at optimally timed intervals that account for high-frequency band characteristics, thereby improving both transmission efficiency and feedback reliability through proactive timing planning.
Data Source
AI summary
The present disclosure relates to a 5th generation (5G) or pre-5G communication system for supporting a data transmission rate higher than that of a 4th generation (4G) communication system such as long term evolution (LTE). The present disclosure relates to a method for operating a terminal, for configuring sub-slots and transmitting uplink information in a wireless communication system, the method comprising the steps of: receiving scheduling information; receiving downlink data from a resource indicated by the scheduling information; and transmitting acknowledgement (ACK) information on the downlink data by using one of sub-slots determined on the basis of a configuration of sub-slots. The sub-slots may have a time length shorter than that of a slot.