Uplink Control Information Transmission with Flexible TTI Configurations
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Current wireless communication systems face challenges in reducing latency and supporting multiple transmission time intervals, subcarrier spacings, and processing times, particularly in next-generation mobile communication systems like new radio access technology (NR) and long-term evolution (LTE).
Innovation Solution
A method for a user equipment (UE) to transmit uplink control information by supporting multiple transmission time intervals, subcarrier spacings, or processing times, involving the configuration of short transmission time intervals (TTIs) and the use of HARQ processes to optimize data transmission and reduce latency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If multiple transmission time intervals and subcarrier spacings are supported to reduce latency, then data transmission speed is improved, but system complexity increases
Solution Approach 1:
The patent implements dynamic TTI length adaptation where the system can switch between different TTI lengths (e.g., 1ms, 0.5ms, 0.25ms) based on traffic conditions and QoS requirements. This dynamic configuration allows the system to optimize transmission speed for different service types while managing complexity through standardized procedures for each TTI length.
Solution Approach 2:
The patent changes key system parameters including TTI length, subcarrier spacing, and processing time based on service requirements. By defining standardized parameter sets for different TTI lengths and associated processing times, the system achieves flexible speed optimization without unbounded complexity growth.
2Loss of time
If multiple processing times are supported at UE and gNB, then latency is reduced, but device complexity increases
Solution Approach 1:
The patent segments processing time into distinct, standardized values (e.g., 1ms, 0.5ms, 0.25ms) that are independently configurable. This segmentation allows the system to select appropriate processing time levels for different services and devices, reducing overall latency while managing complexity through discrete, manageable time units rather than continuous adjustment.
Solution Approach 2:
The patent establishes predetermined processing time values and procedures that are configured in advance for different TTI lengths. By pre-defining processing time requirements and procedures for each TTI length, the system reduces latency through optimized timing without requiring complex real-time processing decisions at the UE and gNB.
3Loss of time
If short TTI configurations are implemented, then latency is reduced, but collision handling complexity between PUCCH and sPUCCH increases
Solution Approach 1:
The patent introduces an intermediary mechanism through standardized collision detection and resolution procedures that mediate between PUCCH and sPUCCH transmissions. When collisions are detected, predefined rules determine priority and resource allocation, reducing latency through automated conflict resolution while managing complexity through standardized mediation protocols rather than ad-hoc handling.
4Productivity
If multiple HARQ processes are supported with different processing times, then data transmission efficiency is improved, but system complexity increases
Solution Approach 1:
The patent creates a universal HARQ process framework that can handle multiple processing times through standardized procedures applicable across different TTI lengths. The same HARQ mechanism operates with different timing parameters, improving data transmission efficiency through parallel processes while managing complexity through universal handling rules rather than separate mechanisms for each timing scenario.
Data Source
Figure 1(a)~1(b)
Figure 2
Figure 3
AI summary
A method for transmitting uplink control information for a terminal supporting multiple transmission time interval (TTI) lengths, multiple subcarrier intervals, or multiple processing time intervals in a wireless communication system according to one embodiment of the present disclosure is performed by the terminal, and may comprise the steps of: receiving a configuration for repeated transmission of HARQ-acknowledgement (ACK)/non-acknowledgement information for a downlink transmission block; and when the repeated transmission is triggered according to the configuration therefor, transmitting the HARQ-ACK information to a base station, wherein the repeated transmission is triggered when a predetermined condition is satisfied.