Configured Grant HARQ Priority Selection for Low-Latency Uplink
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Solution Overview
Problem
The 5G mobile communication system faces challenges in reducing latency for ultra-reliable and low-latency communications (URLLC) services, particularly in scenarios requiring high reliability within tight time constraints, such as industrial control and self-driving, where existing methods fail to efficiently utilize HARQ processes for data transmission.
Innovation Solution
A communication method that involves determining the priority of HARQ processes based on associated data characteristics and network indications to select a target HARQ process for data transmission on configured grants, thereby reducing latency by prioritizing high-priority processes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of time
If a terminal device uses a fixed association policy between configured grant and HARQ process, then the system operation is simple, but the data transmission latency cannot be reduced for high-priority services
Solution Approach 1:
The patent implements dynamic HARQ process selection by allowing the terminal device to flexibly determine the target HARQ process based on priority information. The association policy between configured grant and HARQ process changes dynamically according to the priority of uplink data, enabling high-priority services to use HARQ processes that minimize latency while maintaining simple operation for normal services.
Solution Approach 2:
The patent changes the parameter of HARQ process association from fixed to variable based on priority. By introducing priority as a variable parameter, the system can select different HARQ processes for different priority levels, reducing latency for high-priority data while maintaining simple fixed association for normal traffic.
2Speed
If the terminal device always selects the HARQ process with the shortest timer for data transmission, then the transmission speed is improved, but the reliability decreases due to insufficient retransmission time
Solution Approach 1:
The patent changes the selection criterion from purely time-based (shortest timer) to priority-based selection. By considering priority information, the system can select HARQ processes that balance transmission speed and reliability, ensuring that high-priority services get fast transmission while maintaining adequate retransmission timing for reliability.
Solution Approach 2:
The patent applies different selection strategies to different HARQ processes based on their priority levels. High-priority services can use HARQ processes optimized for speed, while normal services use processes optimized for reliability, creating local quality optimization for different service types.
3Adaptability or versatility
If the network device provides detailed indication information for HARQ process selection, then the adaptability to different service scenarios is improved, but the signaling overhead increases
Solution Approach 1:
The patent extracts only the essential priority information from detailed indication messages, allowing the terminal device to perform HARQ process selection based on this condensed information. This reduces signaling overhead while maintaining adaptability, as the network only needs to indicate priority levels rather than providing complete selection instructions for all scenarios.
Solution Approach 2:
The patent enables the terminal device to autonomously perform HARQ process selection based on priority information and pre-configured parameters. The network device only provides minimal indication information, and the terminal device itself handles the complex selection logic, reducing signaling overhead while maintaining service scenario adaptability.
Data Source
AI summary
A communication method and apparatus. A terminal device determines a priority of a first hybrid automatic repeat request HARQ process. The terminal device determines a target HARQ process from the first HARQ process based on the priority, to transmit data to a network device on a target configured grant by using the target HARQ process. The first HARQ process includes at least one HARQ process corresponding to the target configured grant thereby reducing a latency of transmitting data by using the target HARQ process.