HARQ-Aware Time Unit Configuration for Latency Reduction
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Current time-unit configurations for self-contained operations in mobile communication systems do not adequately consider HARQ processes, leading to increased overhead and average latency, especially when multiple HARQ processes are applied.
Innovation Solution
Implementing a time-unit configuration that includes a downlink transmission region, an uplink transmission region, and a gap interval, where the time unit is structured to accommodate multiple HARQ processes, allowing for fixed signal mapping and optimized processing times by determining the number of HARQ processes based on terminal processing capabilities and adjusting gap intervals accordingly.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a time-unit configuration for self-contained operation is implemented without adequately considering HARQ processes, then the structure is simplified and easier to implement, but overhead increases and average latency increases
Solution Approach 1:
The time unit is segmented into multiple regions including downlink transmission region, uplink transmission region, and gap interval, with each region further divided to accommodate multiple HARQ processes. This segmentation allows independent optimization of each region for its specific function while maintaining overall efficiency.
Solution Approach 2:
The gap interval duration is dynamically adjusted based on the number of HARQ processes and terminal processing capabilities. The configuration adapts to different operational conditions, optimizing the balance between processing time and overall latency.
2Productivity
If multiple HARQ processes are applied in the time-unit configuration, then data transmission capacity increases, but overhead increases and processing complexity increases
Solution Approach 1:
Multiple HARQ processes are merged within a single time unit configuration, sharing common resources such as the gap interval and control signaling structures. This reduces redundant overhead while maintaining the capacity benefits of multiple parallel processes.
Solution Approach 2:
The time-unit configuration is designed to serve multiple functions simultaneously: accommodating downlink data transmission, uplink acknowledgment, HARQ retransmissions, and control signaling all within a unified structure that efficiently shares resources across different HARQ processes.
3Duration of action of moving object
If the gap interval is extended to accommodate processing requirements, then processing time for terminals and base stations increases, but the time unit duration increases and overall efficiency decreases
Solution Approach 1:
Different regions within the time unit are assigned different characteristics optimized for their specific functions. The downlink region, uplink region, and gap interval each have tailored parameters that optimize their local performance without unnecessarily extending the entire time unit duration.
Solution Approach 2:
The gap interval duration and other parameters are dynamically adjusted based on the number of HARQ processes and terminal capabilities. This allows the system to optimize processing time only when necessary, maintaining high efficiency under normal operating conditions.
Data Source
AI summary
A self-contained operation using a time-unit configuration taking into consideration HARQ processes is performed. In base station, transmission section transmits a downlink signal in a downlink transmission region in a time unit composed of the downlink transmission region, an uplink transmission region, and a gap interval that is a switching point from the downlink transmission region to the uplink transmission region; and reception section receives an uplink signal in the uplink transmission region in the time unit. Each time unit includes the downlink transmission region and the uplink transmission region for each of HARQ processes.