Priority-Based HARQ-ACK Feedback Modes for Delay and Signaling Balance
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Solution Overview
Problem
The existing 5G HARQ-ACK feedback modes in unlicensed spectrum face challenges in balancing feedback delay and signaling overhead, particularly for services requiring high reliability and low latency (URLLC) and those needing higher data transmission rates (eMBB), as current modes are prone to errors and inefficient resource utilization.
Innovation Solution
A method and apparatus that dynamically select between enhanced dynamic and one-shot HARQ-ACK feedback modes based on the priority of HARQ-ACK information, ensuring low feedback delay for high-priority services and reducing signaling overhead for low-priority services by using the appropriate feedback mode.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of time
If enhanced dynamic HARQ-ACK feedback mode is used, then feedback delay is reduced, but signaling overhead increases
Solution Approach 1:
The patent applies dynamics by enabling the terminal to dynamically select between enhanced dynamic HARQ-ACK feedback mode and one-shot HARQ-ACK feedback mode based on the priority of HARQ-ACK information. High-priority traffic triggers enhanced dynamic mode for low delay, while low-priority traffic uses one-shot mode for reduced signaling overhead, making the system adaptable to different service requirements.
Solution Approach 2:
The patent changes the feedback mode parameter based on traffic priority. The terminal determines the priority of HARQ-ACK information and switches between feedback modes accordingly, effectively changing system parameters to optimize performance for different service types (URLLC vs eMBB).
2Quantity of substance
If one-shot HARQ-ACK feedback mode is used, then signaling overhead is reduced, but feedback delay increases
Solution Approach 1:
The system dynamically switches to one-shot HARQ-ACK feedback mode when low-priority traffic is detected, accepting increased feedback delay in exchange for reduced signaling overhead. This dynamic adaptation ensures efficient resource utilization for non-urgent services.
Solution Approach 2:
The feedback mode parameter is changed to one-shot mode based on priority assessment, allowing the system to optimize for signaling overhead reduction when time constraints are less critical.
3Device complexity
If fixed feedback mode is used, then system complexity is reduced, but adaptability to different services deteriorates
Solution Approach 1:
The patent introduces dynamic adaptability by allowing the terminal to automatically select between feedback modes based on traffic priority. This maintains relatively simple device architecture while achieving high service adaptability through intelligent mode selection.
Solution Approach 2:
The terminal performs self-service by autonomously determining HARQ-ACK priority and selecting the appropriate feedback mode without complex external control, balancing system complexity and adaptability.
Data Source
AI summary
A hybrid automatic repeat request-acknowledgment (HARQ-ACK) information transmission method, the method includes: receiving downlink control information sent by a base station, where the downlink control information contains a priority of HARQ-ACK information of a corresponding physical downlink shared channel (PDSCH); determining a target feedback mode used for performing HARQ-ACK feedback on the PDSCH corresponding to the downlink control information according to the priority of the HARQ-ACK; and transmitting corresponding HARQ-ACK feedback information to the base station according to the target feedback mode.